hok en g i n e e r ing
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CONT ENTS 01
HOK ENGINEERING
02
PROJECTS BY MARKET TYPE Justice
SUSTAINABILITY
EXISTING BUILDINGS
MEP TECHNOLOGY
Energy Modeling
Adaptive Reuse
Displacement Ventilation
Whole-Building Life-Cycle Analysis Renovation
Radiant Heating & Cooling
Net Zero and LEED Platinum
Central Utility Plants
Facade Design and Analysis
SPECIALTY STRUCTURES
Enclosure Thermal Modeling
Canopies
Daylight and Glare Simulation
Pedestrian Bridges
IT INNOVATION
Feature Stairs
Passive Optical Networks
Vibration Analysis
IT Security Systems
DESIGN COMPETITIONS Circadian Facades
Underfloor Air Systems
Stadiums
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HOK ENGINEERING
#1 A/E firm as ranked by ENR
#1
#1
A/E firm as ranked by Architectural Record
Green Building A/E firm as ranked by ENR
2019
One of Fast Company’s Most Innovative Design Firms
HOK’s culture is rooted in design and technical excellence. This is where great engineering lives. For over 50 years, we have delivered exceptional design with architects at HOK and those at other outstanding practices. We engineer HOK’s most complex projects, from the new Terminal B at LaGuardia, the largest P3 project in US history; to KAUST, a 6.5 million square-foot LEED Platinum Lab of the Year; to the first-of-its-kind Mercedes-Benz Stadium Halo Video Board. We thrive by finding creative, integrated solutions whether we are fine-tuning proven, cost-effective building systems, or exploring ambitious, unprecedented design. We want to be your engineers. We want to bring our experience across the spectrum of project type and size, supplemented by next-generation computational techniques developed by our team and sustainable excellence to your project. Let us help you deliver the best for your Client.
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ENGINEERING SERVICES MECHANICAL
STRUCTURAL
• Air distribution systems - VAV, constant volume, Demand
• Blast & vibration analysis
Controlled Ventilation (DCV), displacement ventilation,
• Existing building assessments
underfloor air distribution (UFAD), dual facade
• Foundation design
• Building automation systems-Integrated smart building systems • Central utility plants • Cooling condensate recovery systems • Energy recovery systems - Air, Water and Steam • Fuel-oil systems-above and below ground with containment • Geothermal systems and ground source heat pumps • Heating, ventilation, and air conditioning • Hydronic distribution systems-building and campus; variable primary or primary/secondary/tertiary • Natural ventilation design • Radiant systems-Chilled beam systems, radiant ceilings, radiant floors, snow melting • Renewable Energy Systems-Solar thermal • Resilience Based design-Mission critical systems • Steam distribution systems-up to 250 psig • Variable Refrigerant Flow (VRF) systems
• Linear and non-linear dynamic analysis • Long-span & special structures • Renovation & retrofit design • Resilience based design • Seismic design • Structural modeling • Technical planning & conceptual studies
ELECTRICAL • Emergency/Standby generator systems • Energy management and conservation analysis • Fire alarm and smoke detection systems • Grounding systems • Lighting / lighting control systems • Lightning protection systems • Low-voltage power distribution (600V and below) • Medium voltage power distribution (4.16kV – 69kV) • Photovoltaic power systems • Power monitoring • Short circuit calculations, protective device coordination studies, and arc flash studies • Sustainable / LEED Design • Uninterruptible power supply systems
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FACADES • Building enclosure design • Thermal performance analysis • Performance Specification
IT & ES SERVICES • Integration of IT&ES into built environment design • Master Planning including IT systems, Security systems, Airport system, etc. • Passive & Active infrastructure (network and systems) design • Converged multi-service network design • Wireless LAN (WiFi) and DAS (distributed antenna system) design • Public Address and Digital Signage design • Command & Control Center design • Vulnerability & Threat Assessments • CPTED (Crime Prevention Through Environmental Design) • Access Control and Video Surveillance Systems • Parking Access Revenue Control Systems • Systems Integration planning and management
ENERGY MODELING • Energy Infrastructure Master Planning
PLUMBING / FIRE PROTECTION • Fire pump/Secondary water storage tank • Gray/Rain Water retention and reuse system • Hot and Cold domestic water system • Medical/Process compressed air system • Medical/Process special gas systems • Medical/Process vacuum system • Mission critical systems • Natural Gas system • Purified water system • Sanitary waste/vent, grease waste/ vent, and process waste/vent systems • Sprinklers and standpipe • Storm water and overflow systems • Vacuum waste systems
PERFORMANCE MODELING • Climate and micro-climate analysis • Computational Fluid Dynamics (CFD) • Cost analysis • Daylighting analysis • Life cycle cost analysis • Multi-Criteria Performance Analysis • Solar resource assessment and levelized cost of energy (LCOE) • Thermal comfort analysis
• Thermal Comfort Analysis • Whole Building Energy Analysis 7 | HOK
Te s t i m o n i a l s “The HOK team delivered a resounding series of design solutions for the airport’s highprofile modernization project. Multiple
challenges
ranging
from complex existing conditions and attention to solutions that
maintain
uninterrupted
We’re honored to work with the best clients, designers, and construction firms in the industry. Here’s what a few of them have to say about our shared experiences.
“
operations, were achieved with talent, energy and enthusiasm, combined with a commanding understanding and use of the current modeling technologies.” Gary Summerlin, Senior Design
We are so grateful to the HOK structural team for their partnership on our project to renovate a factory in a state of disrepair for our headquarters. Our vision of a home for our staff and a thriving community space for our partners would not have been accomplished without the commitment of the structural team to build a strong foundation and backbone. They
always found
creative and effective solutions focused on our goal to create a space that would serve Missouri Foundation for Health well now and for many years to come.” Jill Nowak, CFO Missouri Foundation for Health (MFHH)
Manager, City of Atlanta Department of Aviation
“HOK Structural is an excellent collaborator and has been willing to provide us with a range of options that meet our ideas alongside the various constraints of our project. Their experience with large scale projects has truly been an asset for moving our project forward in an exciting and responsible manner.” Jason Dannenbring, AIA Associate, Snow Kreilich Architects
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“I had the pleasure of working with HOK’s IT&ES (Information Technology and Electronic Systems) team on the LaGuardia Airport Central Terminal Replacement Project. The team worked collaboratively with Skanska, La Guardia Gateway Partners, and the Port Authority of Y& NJ to develop and deliver innovative solutions to facilitate construction and achieve client goals.
Edward D’Angelo Director Information Technology, LaGuardia Gateway Partners
”
“HOK’s engineers contributed significantly to the success of our Phillips 66 Headquarters project and they were key to helping us set project aspirations that will serve us well in the future. They carefully listened to us and they asked us the right questions. They explored and presented us with design options early in the design process and helped guide us to zero in on solutions that were best suited for our needs. Their focused efforts on sustainable design and energy efficiency have resulted in our project achieving LEED Platinum status, Energy Star status and an ASHRAE Technology award. HOK’s engineers worked closely with our P66 team and the construction team in a very collaborative way to deliver a project that we are proud to call our home. My thanks for a job well done!” Jeff French , Director of Facilities Operations Phillips 66
“With knowledge, experience, communications and collaboration, HOK has helped us achieve our goal of having a facility that is consistent, safe and secure.” Capt. Johnny Reed, UDC Transition Team
“Our West Sacramento Headquarters symbolizes CalSTRS’ promise to sustainability while it provides our employees and visitors with a healthy, stimulating and supportive workplace. The 17 story, 409,000 square foot building has maintained its US Green Building LEED® Platinum certification since 2011. The energy efficient building features and the participation of our employees in “green” build-
strengthen and advance environmental responsibility in our community.” ing practices
-CalSTRS
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Engineering partners
Building a successful design team can be as challenging and critical to a project’s success as the design itself. We pride ourselves on being an experienced, collaborative member of any team. We appreciate what everyone brings to the table and enjoy working together to deliver the best for our clients.
“The St. Louis MLS Stadium project gave DMA the opportunity to work on an exciting local project with HOK
engineers
from coast to coast, each with unique experiences and backgrounds. The overall experience was a gainful collaboration for all involved.” Stephanie Spann PE, LEED AP Structural Project Manager David Mason + Associates
“Each time I have had the chance to speak directly with this team I have enjoyed their total focus, I have never felt as if they were in a hurry to get on with something else or had other matters of greater importance to attend to.
Steven Haynes Senior Commissioning Engineer Burns & McDonnell
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”
Over the past 5+ years, HOK and Sykes Consulting have collaborated successfully on the structural design of several projects totaling over $1B in construction cost. The project types and teaming arrangements have varied depending on project and client needs, and the teams have delivered consistently and successfully.
“The expertise of the HOK engineering team and familiarity of our DMA structural engineers with local construction methods and design criteria meshed well to benefit the overall project.” Kara Marfell, PE, SE Structural Project Manager David Mason + Associates
“HOK has been an outstanding partner of SYKES for several years. They continually demonstrate a commitment to team success and promote a shared vision of excellence. Their effective leadership style fosters a collaborative relationship that is built on trust and mutual respect. It is truly an honor and privilege to partner with HOK.” Darien Sykes President, SYKES Consulting
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Construction partners “Through our work at the HJAIA Landside Modernization Project, we had a
great
experience
collaborating
with HOK on the complex engineering requirements for the job. We had a shared focus on doing what is best for our client and delivering an iconic structure for the City of Atlanta. HOK’s design team was always responsive to the project needs and had a great ability to work within the design parameters to drive the project to incredible outcomes.“
Justis Brogan, LEED AP
“
Successful collaboration with our construction partners, from precon through commissioning, is critical to the projects’ success. We are proud to have strong relationships with some of the best construction firms in the world, developed over years on a range of project types and delivery methods, including Design-Build and CM delivery. We take great pride in our collaborative successes.
We enjoy working with HOK, because we have the same intensity in getting challenges met and we see things with a similar, cooperative attitude. We have been on many projects with HOK, and hope to do many more.
Hartsfield was a challenging project, and that’s precisely why HOK and Beck Steel ended up doing it together. Not just anyone could’ve accomplished that, especially in the timeframe we did...in the busiest airport in the world, at night, over an elevated 7-lane existing active roadway. HOK gets a lot of credit not only for enabling the project to go together, but where the project occurred and how it all came together is amazing.” John Beck, Jr. President and CEO, Beck Steel
Project Director | McCarthy Building Companies, Inc.
“HOK’s Structural group was creative, responsive, and provided some of the most accurate information during preconstruction of any team we have worked with. They have been, and continue to be, a valued design partner that we look forward to working with on future endeavors.” ERIKA WINTERS-DOWNEY Senior Engineering Manager,
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McCOWNGORDON
“I had the pleasure of working with HOK’s IT&ES (Information Technology and Electronic Systems) team on the LaGuardia Airport Central Terminal Replacement Project. The team worked collaboratively with
“The success of the Chicago Bears Halas Hall Addition and Renovation was the result of a true partnership between HOK and Mortenson. Having HOK’s structural engineering group as part of the team proved invaluable to the project. As the architect and structural engineer, HOK was able to coordinate closely to achieve the design vision and provide timely resolutions to questions and issues which were key to meeting the project’s challenging fast track schedule. Laura Sables Leber, Director of Design Phase Management, Mortenson
”
SkanskaWalsh JV, LaGuardia Gateway Partners, and the Port Authority of NY& NJ to develop and deliver sustainable and innovative system solutions to facilitate a complex phased construction and achieve client goals.” Ted Jadermark Project Director Skanska
“The Enclosures Team at HOK has been consistently responsive and effective in helping SWJV meet the challenges of the LaGuardia Terminal B Project. Our collaborative efforts have culminated in creating a new and beautiful state-of-the-art facility that will enhance the travel experience for generations of people who live in or travel through New York!“ Douglas C. Maines, Project Director Skanska Walsh Design-Build Joint Venture
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Integrating science and art To create the most imaginative design solutions, HOK blends engineering rigor and optimization strategies with architectural logic and poetry. Our engineers work across every major building typology and provide expert guidance across structural, mechanical, electrical, plumbing and fire-protection engineering as well as facades, information technology and building physics.
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Mercedes-Benz Stadium Halo
The Halo structure, if “unrolled,” would be taller than the Eiffel Tower. HOK Engineering’s design was finished in less than two months and earned the National Council of Structural Engineers Association’s coveted “Most Outstanding Project” award.
Salt Lake City International Airport
The energy-efficient airport meets demanding seismic criteria with steel moment frames and buckling restrained braced frames while maintaining long, clear spans for traveler movement and sweeping landscape views.
BP High-Performance Computing Center
Designed to accommodate “the world’s largest supercomputer for commercial research,” the facility reached a remarkable power usage effectiveness ratio of 1.1 while providing a highly wind-resistant structure protects the computer while providing serene daylit workspaces.
Sidney & Lois Eskenazi Hospital
Daylit interior spaces, green roofs, landscaped courtyards and massive cantilevers define this LEED-gold healthcare facility. The hospital is able to serve 20 percent more patients in less square footage than in the healthcare system’s previous space.
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MEET HOK LEADERS Claire Moore, PE, SE, LEED AP BD+C ENGINEERING PRACTICE LEADER
Claire’s work includes a wide range of experience in structural engineering design, project management and construction administration services. Her technical expertise encompasses both linear and nonlinear analysis, seismic evaluations and retrofits, structural design and BIM modeling. With completed projects ranging from large iconic buildings to small-scale art installations, she has experience in a variety of project types, including higher education, healthcare, justice and aviation. Claire sits on HOK’s Management Board and Technical Board.
Saad Dimachkieh, PE, CLEP, LEED AP ENGINEERING PRACTICE LEADER
An electrical engineer and engineering leader with nearly 40 years of experience, Saad works closely with owners, architects, consultants and contractors to integrate engineering design throughout all phases of project development. His expertise includes engineering management; design and documentation of lighting systems, power distribution systems and fire alarm systems; and coordination with consultants to design security and telecom systems. Saad sits on HOK’s Technical Board.
Gary Kuzma, PE, CEM, LEED AP, GBE ENGINEERING PRACTICE LEADER
Gary is a mechanical engineer with more than three decades of experience leading the mechanical engineering design for many of HOK’s most complex projects. He integrates innovative, highperformance engineering solutions into each building’s design. Gary leads teams in accommodating clients’ program requirements while ensuring system flexibility, reliability, maintainability and ease of operations. He has broad experience in value engineering and life cycle cost analysis, energy analysis and conservation, and sustainable design.
Matt Breidenthal, PE, SE, LEED AP ENGINEERING PRACTICE LEADER
Matt Breidenthal is a structural engineer responsible for delivering award-winning, complex and demanding multi-disciplinary projects. With a strong record of satisfied repeat clients, Matt brings a deep appreciation for interdisciplinary collaboration and is recognized for his ability to bring innovative and creative solutions. Matt has been lead engineer or Engineer of Record on over $10B of construction. He sits on HOK’s Marketing Board and Board of Directors.
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“We often find simple solutions
AND AN AWARD-
to complex problems through a collaborative team approach.”
WINNING ENGINEERING TEAM “It’s fascinating to imagine what a new space looks like, how people experience a building and how the structure interacts with them.”
“We are partners in delivering great design.”
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P RO JECTS BY
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M AR K E T T Y P E
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JU S T I C E 109 | HOK
JUSTICE HOK brings high-performance, integrated engineering solutions to the justice sector, with a focus on creating secure, sustainable and cost-effective facilities. Our team plans building systems that support security and safety, while integrating seamlessly with the architecture. We develop solutions that allow for maximum flexibility and enable effective planning for the future. Through application of high-performance engineering principles, we design with key objectives in mind — to support efficient operations, enhance the environment for occupants, reduce life cycle costs, incorporate sustainability and make the best use of the available budget. We design for a justice facility’s long service life and 24/7 operation with systems that are durable and efficient. We have also devised unique solutions for system maintenance areas to accommodate stringent security requirements. Our approach begins with a focus on client interaction to determine their requirements. We develop detailed design criteria accordingly to bring into the design process. Our design documents not only convey how to build the system but also tells the contractors about security procedures that affect their labor budget. Fear of the unknown in a bid process translates to money. Fully defining the process removes the unknown and thus unnecessary cost. Our team of designers has over 80 years of experience with security automation system design and we bring that experience to each new design opportunity. For the past 40 years, the mechanical and electrical services to each room in a correctional facility would come through a small triangular chase at the entryway accessed from within the housing unit. After Sheriffs and County maintenance staff raised security and operational concerns, HOK devised the rear chase, locating it outside the secure perimeter. The “horizontal service chase” concept creates service corridors behind the cells that are used to access ductwork, plumbing and electrical systems without entering the secure housing unit.
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SELECT CLIENTS
2013
Arnason Justice Center AIA Architecture for Justice Excellence Award
• Montgomery County, Ohio • Marion County, Indiana
Multiple AIA Justice Facilities Review Award Winners
• Bedrock Detroit • City of Indianapolis • County of San Mateo, California • Douglas County, Colorado • Hamilton County, Tennessee • Village of Oswego • Stanislaus County, California • Hays County, Texas • State of Utah • Pasco County, Florida
”HOK staff have ensured our needs have been met as we have moved through the construction process. They spent time talking and listening
to us from the start so they understood what we wanted and needed.. Through the process we have been in contact with them on a regular basis and never once have we got the impression we were a bother.” -Steve Turley, Division Director Institutional Operations, State of Utah
ENGINEERING SERVICES • Structural Engineering • Energy Modeling and Analysis • Façade Design • Security Consulting Design
PROJECT TYPES
• IT Electronics Systems Design
• Courthouses
• Sheriff Offices
• Mechanical Engineering
• Emergency Operations Centers
• Law Enforcement Facilities
• Electrical Engineering
• Forensic Labs
• Plumbing and Fire Protection
• Law Enforcement Offices
• Sustainability
• Correctional Facilities
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RI CHARD E. ARNASON JUS T I CE C E N T ER Mechanical Engineering Electrical Engineering Plumbing and Fire Protection
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RI C HARD E . AR NASON JUST ICE CE N TER Pittsburg, California 71,600 sq. ft.
This new courthouse building serves as a gateway to an emerging civic center in Pittsburg’s central business district. The daylit building was recognized in the AIA’s Justice Facilities Review 2013 which priased “the building’s warmth, sense of openness and the use of natural light throughout.” Sustainable features include extensive natural light and a green roof system that helps reduce runoff and cool the building. The new facility exceeds Title 24 energy use by 22.5% using energyefficient HVAC systems and high-efficiency lighting. Further, efficient plumbing fixtures reduced interior water use by 40%. The building is LEED Silver Certified. The building HVAC design employs the use of a built-up VAV system with frictionless compression chillers. The cooling tower uses chemical free water treatment. The courthouse also incorporates a full building automation system, with thermostats, CO2 sensors, occupancy sensors, and photo sensors to regulate the HVAC and electrical lighting demands. Building orientation, high performance glazing systems and shading devices all mitigate heat gain while maximizing natural light. Only energy-star-rated appliances were used in the building, and construction was completed in less than two years.
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POT T ER COU NT Y DI STR ICT COURT B UILDING Structural Engineering Mechanical Engineering
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Amarillo, Texas 145,000 sq. ft.
The mechanical systems in the Potter County District Court Building includes air cooled chilled water system, hot water heating system and multiple variable flow air handling systems.Design of building envelope and MEP systems were optimized to achieve high energy efficiency with favorable life cycle costing. Estimated site EUI (energy use intensity) is 37.0 kBtu/sf/yr, which is 20% more energy efficient compared to
the
adopted
2015
IECC energy code. High efficiency HVAC equipment are utilized, including high efficiency air cooled chillers and condensing boiler for both heating hot water and domestic water systems.
Hydronic distribution systems, including chilled water and heating hot water, are configured as variable primary flow pumping to reduce pumping energy. Airflow tracking is implemented on supply, return and exhaust air for all air handling systems to enhance building pressurization control. Demand control ventilation is applied in majority of spaces, including courtrooms, conference rooms and offices. Due the tornado hazard in this region, a safe room as defined by FEMA P-361 is required within the project. This safe room is strategically located in the record facility behind the court house. While the structural system of the main courthouse building is a structural steel frame with bracing frames, this one-story precast concrete record building is structurally separated from the courthouse. The exterior load-bearing precast panels comprise the lateral system for the one-story structure, and also serve as the hardened perimeter for the safe room.
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SAN M ATE O COUNT Y SHER IFF’S FO REN S I C S L A BO RATO RY AND CORONER ’S OFF I C E San Mateo, California 29,000 sq. ft. Mechanical Engineering Electrical Engineering
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In this one-story building, HOK designed a “living lab� for sustainability that set new performance standards for forensics laboratories. All regularly occupied areas of the building are daylit, and office areas have operable windows. The orientation of the building, large roof overhangs, north-facing clerestory windows, and canted windows on the southwest reduce glare while maximizing daylight. All the mechanical and electrical systems are exposed, making them easier to maintain. The sloped roof houses 1,418 rooftop-mounted, polycristalline silicon photovoltaic (PV) panels over an area of 22,000 SF. The team modeled energy use and peak loads at 50% less than California energy requirements. With a peak output of 202 kilowatts, the 22,000 square feet of photovoltaic panels produce enough power to accommodate all non-HVAC electrical requirements and to export energy back to the grid during offpeak daylight hours. In addition to the photovoltaic system, it features architectural sun control; daylight harvesting and advanced lighting controls with occupancy sensors and photocells (very little artificial lighting is necessary during the day); natural ventilation via operable windows in office areas; energy-efficient fume hoods and HVAC systems; and sustainable building materials such as lab casework made of certified wood with epoxy resin tops.
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WAY N E CO U N TY CONSOLIDAT ED J USTI CE FACI LIT Y Detroit, Michigan 1.1M sq. ft. Structural Engineering Mechanical Engineering Electrical Engineering IT & ES Design and Security Consulting Plumbing Engineering and Fire Protection Facade Design
The Wayne County Courthouse and justice complex is heated and cooled by chilled and heating water that are generated by an on-site HOKengineered Central Utility Plant (CUP) that is partially funded and operated by DTE Energy. Although the client did not pursue LEED certification, HOK incorporated many of its historically proven low-cost MEP design ideas to improve energy efficiency and occupancy comfort. Large outdoor custom air-handling units with walk-in vestibules, integrated controls, and piping are positioned on the roof of each building and are designed to automatically respond and adjust to demands for HVAC that result in optimum energy savings. Total energy wheels were used on some systems to recover energy from exhaust, pre-conditioning incoming outdoor air. Multiple structural systems were used for the six different buildings on this site. Four of the six buildings were constructed of composite steel floor framing supported on steel columns and two were constructed entirely of structural precast elements. The lateral systems consisted of braced frames, precast shear walls, or masonry shear walls. All buildings were supported on a shallow foundation system which consists of isolated and combined footings. There existed a weaker underlying layer of soil which required careful consideration for the more heavily loaded structures in order to not overload this layer, limiting settlement of soil under sustained loading. HOK’s Security and Technology team designed a security automation system, information transport system, court technology and audio visual systems including an IPTV distribution system. These modules are daisy chained with a single Cat 6 cable in groups of 8. This approach helped save the project millions of dollars in conduit infrastructure cost associated with the traditional approach of routing each device to an equipment room.
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SER VI C E S AN D SPE C I ALT I E S
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04
A few of our favor it e t hing s
+HOK’s Engineering team has experience on a wide array of diverse topics, many of which are included in this section. From pedestrian bridges to passive optical networks, from design competitions to displacement ventilation… please reach out if you’re interested to learn more.
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SPECIALTIES Energy modeling
Energy modeling is an interdisciplinary effort at HOK, requiring close collaboration between the sustainability, MEP, facade design, and structural teams. The process starts at the macro-scale to determine orientation and form for passive climate control and becomes more detailed when MEP system selection, facade condensation analysis and thermal bridging studies come to the forefront during schematic design and design development.
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87% wind ow-to-
50% window-to-
87% window-to-wall
wall ratio, Royal
wall ratio (WWR)
ratio + extended slab
Caribbean HQ
edges = energy performance of 50% WWR
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Embodied carbon is CO 2 emitted by raw materials extraction, materials processing, constructi on, repair, and endof-service life (landfill, re-use
S P E C I ALT I ES Li fe- c ycl e a na lysis
or recycling) scenarios.
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Unlike operational carbon associated with heating, cooling and lighting, embodied carbon is emitted almost entirely at the beginning of a building project. Quantifying these emissions informs design decisions, resulting in a lower carbon footprint at each stage of the design process.
Cement replacements, sourcing local materials, and multipurpose structural systems are key components of the carbon reduction process. While 5%-10% reductions will earn the project additional LEED credits, HOK aims much higher, making net-zero embodied carbon within reach.
Transport
You ca n o n ly imp rove wh a t you me a sure
End of use
U n ders ta n d em bo died CO 2 by
As a signatory to the SE 2050 challenge targeting
life-c yc le s ta ge
net-zero structura l carbon emissions by 2050, HOK structures quantifies the embodied emissions of every building project’s structure and enclosure by conducting Whole Building Life Cycle Assessment (WBLCA). This allows clients and designers to make informed design decisions which minimize building embodied carbon over the course of the design process.
Pinpoint sources of CO 2 emissions by building system...
Materials
Repair
...and by material Polymers
Windows
Glass
Slabs
Exterior walls
Shallow foundations
Steel
Concrete
207 | HOK
N et - ze ro a nd LE E D Pl a t i num
S PECI A LTI E S HOK | 208
To achieve a Net Zero Energy Building, HOK has developed the 6-Step process to Integrated Performance Design: Discovery & Definition – Our process kicks-off with a sustainability charrette, where our integrated HOK team will work with you to define roles and responsibilities, set targets for energy, water and waste, identify energy benchmarks, Energy Use Intensity (EUI) targets, financial parameters and alternative financing solutions, and potential solutions and incentives for the project. Climate & Place – The next step is to perform a site and climate analysis for the site to understand external loads, resources and challenges. The analysis should look at topography, geology, biology, and hydrology in addition to context clues, such as cultural norms and systems that are geographically appropriate. The design team will look for opportunities to harvest free water and energy from the site, including rainwater, condensate, natural ventilation, passive solar heating and convection. Load Reduction – The most cost-effective way to reach net zero is to reduce overall building energy loads before designing a renewable energy system to provide sufficient energy for the building. Load reduction will minimize the renewable energy investment by reducing the size of the photovoltaic array or other renewable energy sources. Load reduction may be achieved and through programming and space requirements reduction, site planning, massing and orientation, building envelope optimization, high efficiency HVAC systems and plug load control. The load reduction will be demonstrated through energy modeling and other analytical tools. Integrated Solutions – We use design tools to optimize the building envelope, daylight and thermal comfort. We evaluate MEP and structural systems, site and landscape to minimize energy and water resource use that meet the program requirements set by the client and end users.
Renewable Systems – After building energy demand has been reduced through load reduction and efficient systems, the project can employ renewable energy systems to make up the balance of demand. As each project has it’s own challenges, HOK engineers can help determine the correct renewable energy system for each project. Occupancy – Once the building has been designed to achieve Net Zero Energy over the course of a year, it will be important to monitor, measure and optimize building performance, as well as engage occupants in energy conservation and plug load reduction activities. Building optimization for Net Zero performance is a process rather than a destination.
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SP ECIA LT I E S
Facade thermal performance
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Of fset mullio n a t
St a nd a rd m u l l i o n
O f fs e t mu l l i o n a t
St a n da rd mu l l i o n a t
span drel
a t s p a nd re l
vi s i o n gl a s s
vi s i o n gl a s s
The facade design team blends art and science seam lessly to design facade assemblies, analyzing the conduction,
convection
and
radiation
that
controls
the
location of the dew point temperature for each facadestructure condition in the building. Boundary conditions based upon extensive climate data are gleaned from the NFRC and ASHRAE 90.1 to simulate the behavior of the system in research-grade programs such as THERM.
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S P EC IA LTI ES Facade design an d an alysis
C o ns tructabi l i ty,
pe rforman ce ,
an d
e con omy
A beautiful yet high-performance building skin is scrutinized early in the process for three key reasons: to calculate the weighted average U-value of the assembly, to determine the risk of condensation, and to ensure constructibility and alignment with the project budget and performance criteria.
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SPE CIA LT IES Fa cade t h er mal per fo r man c e
65F and 35%RH = 37F DP 65F and 35%RH = 45F DP
Academic hospital parapet detail optimization yielded 5 instead of 4 inches of insulation in the lower lite and replacing metal back pan in lower lite and with insulation tape which raises the temperature of the corner by 14 degrees. This re sults in a detail with significantly less risk of condensation at this parapet than a standard detail.
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SPECIALTIES Fac ade dayligh t in g per for man ce
O p ti mi ze i l l u ma n c e
M i n i mize gla re
Ma x imize dayligh t a u to n o my
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Simulation Solemma
of
daylighting
Climate
Studio
with helps
evaluate the trade off between view and natural light to minimize heat gain and glare. HOK facades works with the design team to asses options as early in the process as possible to find optimal and
economical
solutions
that
lead to comfortable and productive spaces
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S P EC IA LTI ES Facade in n ovat io n
CIRCADIAN FAÇADE HOK Facades and WSP Built Ecology developed a concept based on the Gartner/Permasteelisa Closed Cav ity system, curved lites to facilitate automated shading allowing indirect natural light and views at all ti mes. Potential savings
25%
operational
compared
to
energy
convention -
al building. Structural glass saves 4,000 tons of embodied carbon by reducing need for aluminum in the mullion framing.
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S P EC IA LTI ES Facade in n ovat io n
CIRCAD IAN FAÇAD E
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S PECIALT I ES
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Fa c ade In n ovat ion
STRUCTURAL EXTERIOR ENCLOSURE This design for a megapanel cladding system which provides lateral stiffness to the primary structural frame of a high-rise tower was a collaboration between the structural and facades teams. Designed and analysed to
the cl a d d i n g co ncept reduce s t h e t ower’s E mbo di ed Ca r b o n s i gni fi cantl y by s u p p l e m e nti ng co re dri ft co n t ro l with a steel braced panel meet code performance criteria,
system that supports a shallow glazing system, in p lace of a conventional aluminum curtainwall.
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S PECI A LT I E S De s ig n c o m p e titio ns
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Le t e n g in e e r i ng be t h e d i f fe re nc e i n your wi nni ng c omp e t i t i on d e s i g n
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SP ECI ALT I E S
Des ign co mp e t i t i o ns
Do n’t limit you rse l f: l e t u s p rov id e yo u w it h opt i ons you d i dn’ t know we re p os s i b l e
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The tension and compression in a bicycle wheel illustra tes the concept enabling the vast span.
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D esi g n co m p e t i t i o ns
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U npa ra lleled ac c ura c y a t t h e co m pet i t i o n ph a se:
let our S TREAM wo r kf l ow h el p yo u ge t a h e a d st a r t
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Existing buildings
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This is an existing 32 story office building in downtown Houston. It is framed with structural steel and served as the offices for El Paso Energy. Since the entire tower was to be upgraded, it was necessary to upgrade the structure as well to bring it up to date with the occupancy. Over the years, significant changes have been made to the wind code, the wind speeds and wind forces had been revised
The challenge was how to strengthen and stiffen the existing structure to bring it in compliance with the new wind codes. An extensive structural analysis to be much greater than those at the time the tower was designed.
was done using the stiffness of the existing masonry core walls. Since these were interior walls and not reinforced with rebar and not grouted, a detail analysis was done taking the reductions in the stiffness of these existing walls. Fortunately, there were sufficient such walls and even with the taken reductions provided sufficient stiffness to meet the code required wind forces.
S PE C IA LT I ES
Renovation
HOK’s structural team renovated an abandoned thirty-yearold former Sysco Distribution center to become a new home of the Houston Food Bank. This 308,000-sf warehouse building allows HFB to improve their logistic and expand community services. Several existing post-tensioned tilt-up wall panels were cut and removed to create the welcome center and main entrance of the facility from nothing but a
Since most of the wall panels were load-bearing elements, the modification to them required special care. To ensure the safety long line of existing loading docks.
of construction, our structural engineer worked closely with the general contractor to develop step-by-step construction procedure in several critical areas such as where the new monumental stair was added.
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S P E C IALT I ES
Renovation
600 Travis, also known as JPMorgan Chase Tower, is the Houston’s tallest building. The original main lobby featured a 5-story tall vertical curtain wall which are being replaced by a new curtain wall system with a pyramid shape. This renovation allows the lobby depth to be expanded and promotes the circulation and the utilization of the lobby area. It also improved the connectivity of the lobby and the outdoor plaza area. To maintain the operations of the building loading dock and several retails in the basement under the lobby, the new curtain wall frame was designed to be primarily suspended from two existing concrete columns at level 6 which minimized the structural strengthening required on the underside
The boundary conditions of the framing system were strategically designed to maximize the structural efficiency and constructability. of the ground floor slab.
Besides the pyramid curtain wall, the structural team also worked closely with the landscape team to add several site structures and modified landscape profile of the plaza. The design was coordinated to minimize the required structural modification and keep the project under the budget.
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S PECIA LTIES
M I SS OU R I F OU N DATION F OR H E A LT H
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St. Louis, Missouri
We are so grateful to the HOK structural team for their partnership on our project to renovate a factory in a state of disrepair for our headquarters. Our vision of a home for our staff and a thriving community space for our partners would not have been accomplished without the commitment of the structural team to build a strong foundation and backbone. They always found creative and effective solutions focused on our goal to create a space that would serve Missouri Foundation for Health well now and for many years to come.� -Jill Nowak, CFO, Missouri Foundation for Health (MFHH) 235 | HOK
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TYSON FOOD S D I SCOVERY CENTER AND PI LOT PLANT Springdale, Arkansas
This renovation and addition to Tyson Foods’ original 1940s headquarters and Brown’s’ Hatchery provides space for 400 IT employees while
revitalizing
landmark.
a
downtown
Springdale
HOK’s design pays homage to the place where familyowned Tyson got its start.
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SP E CIALTIES
T YSON FOOD S DISC OV E RY C E N TE R A N D P ILOT P L A NT Springdale, Arkansas
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Wood reclaimed from the original buildings accents much of the interior, including the reception area, stair treads, walls and landing. Paired with sleek building forms, the reclaimed wood and original brick facades reinforce the connection between innovation and history. Situated along the Razorback Greenway shareduse trail, the building’s location encourages team members to bike or walk to work. A garden on the west side of the facility has shuffleboard, bocce ball and a fire pit that add to the neighborhood’s vibrancy. The Emma Avenue Office is one of several projects for which Tyson Foods has partnered with HOK over the past decade. This renovation and addition to Tyson Foods’ original 1940s headquarters and electric hatchery provides space for 400 IT employees while revitalizing a downtown Springdale landmark. HOK’s design pays homage to the place where familyowned Tyson got its start. A new light-filled, central lobby links the two historic buildings and provides employees and guests with a place to collaborate.
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S P E C I A LT I E S C a nop ie s
Delivering iconic, long-span structures while ensuring continuous airport operations is core to HOK’s engineering for aviation practice. As part of the modernization of the world’s busiest airport, HOK delivered a structural and architectural icon for Hartsfield-Jackson Atlanta International. Dual 864’ long structural steel canopies clad in ETFE flank the existing terminal and suspend new pedestrian bridges over the existing roadways, with complex existing conditions at each end of the span.
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While the truss chords appear to consist of a consistently varying curvature, they are actually comprised of discrete constant-curvature sections, significantly less expensive to fabricate. The truss splice connections were designed with internal bolts erected during a midnight-to-5am schedule to minimize lane closures, concealed with welded cover plates afterwards. This innovative design process delivered what the airport General Manager deemed “iconic architectural landmarks for the City of Atlanta.�
To make this possible, HOK structural engineers generated parametric structural models integrated with the architectural models to verify viability, performance, and minimize load applied to the existing structures. This provided continual feedback to the design team and shortened the design process from months to three weeks. Geometric optimization and lightweight ETFE cladding decreased the weight of the structure enough to allow it to rest upon the existing building without additional columns. The sweeping form of the diagrid canopy emerged from the most efficient structural load path found by the team’s algorithm, finessed by creative decisions to simplify construction.
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SPECIALTIES Pedestrian bridges
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of green space near downtown Houston. Two separate branches of this bridge draw pedestrians over Memorial parkway and the river before adjoining together into a descending loop at the sculpture park on the opposite side. The bridge belongs to a family of five recreational structures featuring long spans and dramatic cantilevers designed by the structural group to create spaces for outdoor performance, relaxation and river sports.
Rosemount Bridge, Buffalo Bayou Park, Houston TX
S P ECI A LTI ES Pe de st rian br idge s
The Buffalo Bayou river winds through 160 acres
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SPECIALTIES Stairs
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Stairs become sculptural centerpieces encouranging interaction between programs, people, and spaces. HOK engineers stairs that appear to float while conforming to deflection and vibration criteria so stringent, they can be clad in glass (and covered by its warranty).
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The HOK structural team collaborated with the interiors group to deliver a striking feature staircase for the Norfolk Southern Headquarters project in downtown Atlanta. While the shape of the stair is a set of concentric spirals from levels 2-4, the shape unravels into a surrealist, sculptural ribbon.To support the Corian cladding and shape, curved steel plates were used to form the stair stringers as well as the hand rail supports. This improves the structural ef ficiency by increasing the cross-section moment of inertia.
Ribbon below the stair is a made up of a series of frames linked together by curved steel edge members and joins seamlessly with the steel plate stair at level 2. For this to be successful, an iterative process bet ween the interiors and structural design was imperative. Further, cam ber was applied to counter the un-raveling effect gravity loads wield on spiral geometry.
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SP ECI A LT I E S
Vi b ra t i o n a na l ysi s
Successful, proven strategies for addressing structural vibration performance and cutting unnecessary project costs.
The archi tecture and engineering team developing options on an integrated approach for the structural framing and mechanical distribution. This system in creased p lenum depth by 20%, dramatically increasing energy performance while maintaining desired ceiling height and a wide array of location-specific vibration criteria.
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Vibration criteria can be major drivers of project cost when addressed in an overly conservative way, or a major source of risk if they were to not be addressed sufficiently.
HOK’s Engineering team has
extensive experience in designing cost-effective structures for strict vibration performance on a wide range of structural systems and types, including laboratories, healthcare facilities, stadia, training centers, bridges, stairs, and renovations. We use advanced analysis techniques to accurately model and optimize structural systems for location-specific vibration criteria and forcing functions, for occupants and for equipment.
We work with the design team
to develop integrated systems solutions that deliver structural performance while maintaining sufficient space for services distribution.
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SP ECI ALT I E S
Dis placement ve nt i l a t i o n
Displacement air systems take advantage of ther mal stratification to move air through the space at very low velocities. The cooler supply air is introduced low in the space and is attracted to the warmer surfaces throughout the space. As the air being supplied is warmed a natural draft is cre ated as air is collected and removed at the ceiling level. This design approach lowers the quantity of airflow needed to condition only the occupied zone of the space. Because supply air is introduced into the space at an elevated temperature when compared to traditional overhead HVAC systems displacement air systems increase the hours that airside econo mizer cycles can be used to effectively provide free cooling and reduce HVAC cooling energy. Ventilation effectiveness is increased with displacement air systems by supplying air directly to the occupied zone with less mixing than a traditional overhead system thus improving indoor air quality and occupant comfort. HOK’s engineering team has implemented displacement air systems in projects with large vol ume spaces where conditioning the entire volume of the space would not be efficient, as well as projects where the design teams goal was to mini mize or hide the appearance of the HVAC system by integrating it into architectural features. On some projects, like the Salt Lake City Internation al Airport, displacement air systems were coupled with evaporative cooling systems to further increase the hours that do not require mechanical cooling.
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SPE C I ALT I E S
Radiant heating a nd co o l i ng
Radiant heating and cooling systems can improve occupant comfort and increase energy savings versus traditional HVAC strategies through better control over operative tem perature of the space and the lower transport energy inherent to waterbased systems. High mass radiant systems can store energy that can be re-charged during off hours to offset operational cost. HOK’s mechanical engineering team has extensive experience with ra diant heating and cooling systems through our work on past projects in Aviation, Science and Technology and Corporate markets. HOK’s radiant system designs have utilized both in-slab, panel systems and chilled beams. On some projects, like the Salt Lake City International Airport, the radiant systems were coupled with displacement air systems to maximize energy savings. Through HOK’s collaborative team approach and close integration with our fellow architectural and structural engineering team members radiant floor slabs are designed to optimize appearance, performance and cost.
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The Cummins concrete cooling towers, the NASA B-48 CUP and the BP High Performance Commuting Center CUP. The Cummins cooling tower was a collaboration with the s tructural team. HOK designed CUPs have served everything from NASA’s mission control, data centers, universities, laboratories, airports, justice complexes, manufacturing facilities, office buildings and various other type of mission critical spaces.
Central Utility Plants (CUPs) are the beating heart of heating and cooling systems in buildings as CUPs provide chilled water, heating water and/or steam to buildings and campuses. We focus on issues like future expansion, operational flexibility, cost, controllability, simplicity, energy-efficiency, plant optimization, turndown, resiliency, uninterruptable operation, fail-safe operation, continuity of building operations, maintainability and serviceability. Pulling from our vast and extensive experience allows us to efficiently tailor designs to Project specific requirements while providing coordinated and multi-discipline solutions to common issues such as maintainability, serviceability and resiliency. HOK designed CUPs have incorporated a variety of technologies to meet the varying project needs including thermal ice storage, field-fabricated custom cooling towers, low temperature condenser water operation, commercialgrade DDC controls, industrial-grade PLC controls, central plant optimization software and make-up water storage.
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SP ECI A LT I E S
U nd e r fl o o r a i r syst e m s AIR-COOLED WHITE SPACE
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Displacement Ventilation systems are able to save energy in a number of ways. While they use air for cooling and heating like VAV systems, they usually only need to supply about 60% as much air to provide the same amount of cooling, which reduces the fan energy. The systems are designed to cool the occupied space only, so space heat loads from items at the ceiling (like lighting) do not necessarily need to be cooled, also saving energy.
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Supplying air at about 68°F/19°C instead of 58°F/14°C can affect the energy both ways – it depends on the climate and what sort of recovery systems are used at the central plant. But in very cold climates or climates with high humidity, this may actually increase energy consumption.
UNDERFLOOR RESULTS 2020 Rice Oil & Gas HPC Workshop
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SP ECI A LT I E S
Pa ssi ve o p t i ca l ne t wo r ks
New network technologies enable designers to create buildings that support communications requirements with less space, power, cooling and infrastructure. Passive optical networks (PONs) use fiber optic cables that transmit signals more effectively than traditional copper cable-based networks . For the past several years, PON technology has been used to deliver phone, data and television services into homes. Today, PON equipment is being repackaged into devices appro priate for installation in many building types. Integrating PONs into a building design can generate signifi cant first-cost and long-term operational savings.
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Intermediate Distribution Frame (IDF) for a Traditional LAN: Power required: 6-8 kVA for active network equipment Dedicated HVAC required Approximate room area: 120 sf per every 10,000 sf
IDF for a Passive Optical LAN : No power requirements or cooling equipment for passive equipment Approximate Room area: 28sf per every 10,000sf
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SP ECI A LTI E S IT secu r it y syst ems
The security automation systems for justice complexes is an innovative design process, minimizing the number and use of traditional control rooms.
Campusus often include a
dedicated security LAN that centralizes the video security system in a single area, making it easier to manage. The security system LAN includes an array of edge, aggregation and core Ethernet switching appliances that provide recording and playback functionality throughout the campus.
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