Clifford L. Allenby Building E-blast Volume 1, Issue 2
April 2019
Introduction In this edition of our monthly E-blast, we explore how the building is designed to perform as efficiently as possible, how innovative heating and cooling systems will create a comfortable environment, and what you can do to help the building achieve Zero Net Energy (ZNE).
Reinforcing at shear walls and deck at 1st floor west side.
Construction Update
Architectural wall forms at north side of 1st floor.
Save the Date
Clifford L. Allenby Building Town Hall April 10, 2019, 1:00pm Bateson Building Atrium We welcome your questions, comments, and suggestions for topics for future E-blasts. Please submit to OStreet@chhs.ca.gov
At this time, the placement of the concrete slab at the first floor is complete. Shear wall and column concrete are complete on the east side of the first floor, and reinforcing is in progress on the west side. Architectural wall forms between the first and second floors have been erected on the north side. Chilled water piping is in use, servicing the Clifford L. Allenby Building, the California Department of Food & Agriculture, and the California Department of Veterans Affairs.
Concrete placement 1st floor west side.
Work in April will include completion of walls and columns to the second floor on the west side, architectural walls to the second floor on the east side, and the forming of the second-floor deck. Shear walls and columns to 2nd Floor at the east side.
Questions, comments, suggestions? Please submit to OStreet@chhs.ca.gov
Clifford L. Allenby Building E-blast_Volume 1_Issue 2_April 2019
Clifford L. Clifford L. Allenby Allenby Building Building Energy Use Intensity Energy Use Intensity (EUI) is a standard indicator that allows us to compare energy use across buildings of various types, sizes, and configurations. This is similar to miles per gallon (MPG) for automobiles, however in the case of EUI a lower number signifies a more sustainable building. We measure a building’s EUI by calculating its annual energy use per square foot, which is expressed in thousands of British thermal units per square foot per year (kBtu/SF/yr). A British thermal unit is the amount of heat energy required to raise the temperature of one pound of water by one degree Fahrenheit. A typical office building built today that complies with the California energy code would have an EUI in the mid-forties, while a typical existing building would have a much higher EUI, around 100 Kbtu/SF/yr. The projected EUI for the Clifford L. Allenby Building is in the midtwenties, without accounting for the renewable energy sourced from a regional photovoltaic array provided by the Sacramento Municipal Utility District. With the addition of this solar energy, the building will be Zero Net Energy (ZNE). To meet our targeted EUI and goal of ZNE, the team has designed a high-efficiency HVAC system, low-energy LED lighting system, a well-constructed building envelope, broad temperature bands, and an environment that maximizes natural daylight, all of which contribute to long-term sustainability. As building occupants, you can help to achieve these goals by making sure that computer equipment and lights are turned off when not in use.
EUI High
31.6
Target
24.8
Low
20.8
Connection to the Central Plant As part of the project’s functional, cost-effective approach to sustainability, the building’s mechanical systems will connect via utilidor to the existing State Central Utility Plant (CUP), which supports the heating and cooling of all State buildings downtown. Designed in 2010, the CUP consolidates the operations of the connected buildings, which, in contrast to smaller local systems, reduces operating costs, establishes consistency, and is easier to service and maintain. The building will take full advantage of the chilled water in order to maximize efficiency, conserving energy and resources.
Clifford L. Allenby Building E-blast_Volume 1_Issue 2_April 2019
Understanding that the building will need heat for almost half the year—though often small amounts for morning warmup—the team incorporated a stand-alone, waterto-water heat pump (WWHP) to reduce the building’s emission of greenhouse gases. The WWHP, which runs on electricity, leverages the energy created by the chilled water system as a means for highly efficient heating. In addition to increased efficiency and lower emissions, this system also offers equipment redundancy, creating multiple paths to heating to ensure that it is always available. The CUP will also fully support heating, which will provide comfort even in the coldest months of the year.
Clifford L. Clifford L. Allenby Allenby Building Building Sustainability Spotlight Chilled Sails and Panels: What are they and why are we using them? Designed to transfer heat and cooling from the water provided by the CUP to specific rooms in the building, chilled sails and panels are utilized overhead in the open office areas of the building. They transfer heat from water to air through a combination of natural convection and thermal radiation, which, compared to traditional systems, reduces energy usage as it takes far less energy to move heat through water than through air. Chilled sails and panels enhance
comfort for building occupants, providing even cooling throughout the space, eliminating drafts, and improving air quality. They also work in tandem with low-velocity underfloor air systems, which reduce the gusts of air velocity to create a more uniform and comfortable environment. Adjustable floor diffusers are located throughout the office areas and can be opened or closed to suit individual comfort needs. As part of the overall energy and comfort strategy for the building, the temperature setpoint for cooling may be slightly higher than the current setpoint in the Bateson Building. This
RADIANT CONDITIONING Passive chilled sails and perimeter radiant heat deliver efficient enhanced comfort EXTERNAL SHADING Reduces glare, thermal discomfort, and cooling energy use THERMAL MASS Exposed post-tensioned concrete structure provides enhanced thermal comfort and energy savings DISPLACEMENT VENTILATION Underfloor air system provides flexibility, efficiency and additional fresh air over code ACTIVE WORKPLACE HUBS Departmental connecting stairs in the “Plaza�, one of three sets of compelling elevator alternatives in building, promoting interaction OCCUPANT FEEDBACK Dashboard for performance metrics and data analytics EV CHARGING (2) 240v and (18) 120v chargers in parking garage; (6) 120v chargers in parking lot
is possible because the building is designed to account for a wider range of human comfort factors than simply air temperature, including the radiant capabilities of the chilled sails and panels. Your body will experience cooling directly from the chilled sails and panels even though the air temperature may be warmer than you would expect otherwise. However, everyone has different sensitivities to heating and cooling, so it is highly recommended that you dress in layers as part of your daily routine. Not only will you be more comfortable, you will also help the building achieve its energy efficiency targets.
HEAT RECOVERY Enthalpy recovery wheel transfers sensible and latent energy from ventilation exhaust to supply EXCEPTIONAL AIR QUALITY Electrostatic filters provide high filtration to 100% outside air with reduced energy and maintenance RECLAIMED WATER Rooftop collection of rainwater and air handler condensate DAYLIGHT AND VIEWS North open office features glarefree daylight and view to Capitol grounds and mountains PLUG LOAD MONITORING Circuit power metering at each floor WATER METERING Separate tracking used for harvested and reused water. GREYWATER RE-USE 25,000 gallon tank collects rainwater and AHU condensate, augmenting greywater day tank to supply toilets BIKE FRIENDLY Commuter facilities include 100 secure racks and 4 showers
Clifford L. Allenby Building E-blast_Volume 1_Issue 2_April 2019