PassivOffice @Devonshire Gate
architects • engineers integrated sustainable design mechanical engineering natural ventilation design passivhaus consultancy healthy building design landscape design permaculture design building monitoring research & development
Exeter Office Exeter Bank Chambers 67 High Street Exeter Devon EX4 3DT Tel. 01392 279220 Fax. 01392 279036
Bideford Office 18 Market Place Bideford Devon EX39 2DR (Registered Office) Tel. 01237 474952 Fax. 01237 425669
www.ecodesgn.co.uk
Project Team
Our Team
• David Disney, Devonshire Gate Client • Gale & Snowden Project Managers Architects, Mechanical Engineers, Landscape
Passive natural vent
Permaculture design
• Exeter University • Jenkins Hansford Partnership - QS
Passivhaus certified
Landscape integration
The Project
Site plan
- RIBA Workstage EFG
The Project
- RIBA Workstage EFG
New Office Project • • • •
First Phase 1250 sqm Passivhaus design Natural ventilation in summer • Optimum day light • Planning restrictions • RIBA Workstage E/F/G Low energy - Healthy - Integrated landscape
Adaptation Issues Key Issues • Increased internal temperatures • Increased external temperatures • Changing rainfall patterns • Localised air pollution • High internal gains • Daylight Requirements • Increased weather severity
Methodology Solar XXI Building (Lisbon, Portugal)
Analysis
• Literature research • Case studies • Thermal modelling past projects with future weather files • Ongoing IES thermal modelling • PHPP (Passive House Planning Package) • Occupant heat stress & impact on productivity analysis • Cost matrix • Integrated team studio working Day light modelling In IES
Methodology Climate Risk Radar
Climate change related risks are rated for their probability and their potential impact resulting in a risk magnitude.
Following detailed analysis of building’s exposure to climate change related risks, the 2030, 2050 & 2080 @ 50 percentile with high CO2 emission scenario was chosen.
Findings - Thermal Comfort
The same design principles that reduce heat energy losses in winter will help to reduce overheating in summer.
Findings - Thermal Comfort Super insulated envelope
The same design principles that reduce heat energy losses in winter will help to reduce overheating in summer.
Findings - Thermal Comfort Super insulated envelope
High performance windows
The same design principles that reduce heat energy losses in winter will help to reduce overheating in summer.
Findings - Thermal Comfort Air tight construction
Super insulated envelope
High performance windows
The same design principles that reduce heat energy losses in winter will help to reduce overheating in summer.
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
The same design principles that reduce heat energy losses in winter will help to reduce overheating in summer.
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Important: In a Passivhaus night cooling is very effective and a successful natural ventilation strategy will reduce the risk of overheating considerably
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Additional measures to reduce the risk of overheating Thermal mass in combination with night cooling Inclusion of thermal mass
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Additional measures to reduce the risk of overheating External shading via roof overhangs or flexible blinds External shading
Inclusion of thermal mass
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Additional measures to reduce the risk of overheating Intelligent window control system to optimise ventilation rates External shading
Inclusion of thermal mass
Intelligent Window control
Findings - Thermal Comfort Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Additional measures to reduce the risk of overheating
External shading
Inclusion Reduce of thermal Internal mass gains
Intelligent Window control
Reduction of internal heat gains by moving heat sources outside the thermal envelope (eg servers etc)
Air tight construction
Super Thermal insulated Bridge envelope free
High performance windows
Thermal modelling results – Frequency of overheating
Findings - Thermal Comfort
Additional measures to reduce the risk of overheating
External shading
MVHR Ground cooling
Inclusion Reduce of thermal Internal mass gains
Intelligent Window control
Supply air reduced by 10°C in summer combined with closing windows above 22-25°C reduces overheating to zero in 2080 Now 2030 2050 2080
Findings – Landscape
1. Planting micro climates
Findings – Landscape Green roof Attenuation Evaporation cooling
1. Planting micro climates
Findings – Landscape Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates
Findings – Landscape Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates
Findings – Landscape Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates
Findings – Landscape Shaded external working areas
Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates
Alternative Landscape Design
Findings – Landscape Shaded external working areas
Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates 2. Resilient landscaping
Ponds to moderate flood/drought cycle
Findings – Landscape Shaded external working areas
Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates 2. Resilient landscaping
Ponds to moderate flood/drought cycle
Earth bank and trees act as windbreak
Findings – Landscape Shaded external working areas
Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates 2. Resilient landscaping
Ponds to moderate flood/drought cycle
Earth bank Planted areas and trees act to increase as windbreak infiltration
Findings – Landscape Shaded external working areas
Shading from trees
Reduce hard surfaces next to building
Green roof Attenuation Evaporation cooling
Transpiration cooling
1. Planting micro climates 2. Resilient landscaping
Ponds to moderate flood/drought cycle
Root system for erosion control and slope stabilisation
Earth bank Planted areas and trees act to increase as windbreak infiltration
Design for severe weather Driving rain •robust timber rain screen cladding •enhanced window and door specification and detailing
Increased wind severity
•eaves and verge robust details •Robust materials and secure fixings
Increased UV •turf roof •timber cladding
Future adaptability •future addition for shading devices •Future external working areas
Flooding events
•oversized rainwater goods and drains •attenuation ponds
Passivoffice @ Devonshire Gate detail design drawings
Lifecycle Costing Cumulative Discounted Energy Related Costs for an Office Building Built to 2010 Building Regulation Requirement
Energy Costs Standard Office
£4,500,000.00 £4,000,000.00 £3,500,000.00 £3,000,000.00 £2,500,000.00 £2,000,000.00 £1,500,000.00 £1,000,000.00 £500,000.00 2090
2088
2086
2084
2082
2080
2078
2076
2074
2072
2070
2068
Lighting Costs
2066
2064
2062
2060
2058
2056
Cooling Costs
2054
2052
2050
2048
2046
2044
Heating Costs
2042
2040
2038
2036
2034
2032
2030
2028
2026
2024
2022
2020
2018
2016
2014
2012
2010
£0.00
Energy costs represent net present values and include inflation and a 30% reduced heating energy demand from 2050 onwards.
Lifecycle Costing Cumulative Discounted Energy Related Costs for a Passive Office Designed by Gale & Snowden Architects
Energy Costs PassivOffice
£4,500,000.00 £4,000,000.00 £3,500,000.00 £3,000,000.00 £2,500,000.00 £2,000,000.00 £1,500,000.00 £1,000,000.00 £500,000.00
2090
2088
2086
2084
2082
2080
2078
2076
2074
2072
Lighting Costs
2070
2068
2066
2064
2062
Cooli ng Costs
2060
2058
2056
2054
2052
Heati ng Costs
2050
2048
2046
2044
2042
Additi onal Investment
2040
2038
2036
2034
2032
2030
2028
2026
2024
2022
2020
2018
2016
2014
2012
2010
£0.00
Energy costs represent net present values and include inflation and a 30% reduced heating energy demand from 2050 onwards.
Lifecycle Costing Gale & Snowden Design vs Standard OfficeEnergy Building - Comparison Cumulative Discounted Related Costs of Cumulative Discounted Cash Flows for a Passive Office Designed by Gale & Snowden Architects
Comparison PassivOffice vs Standard Office
£4,500,000.00 £4,500,000.00 £4,000,000.00 £4,000,000.00 £3,500,000.00 £3,500,000.00 £3,000,000.00 £3,000,000.00 £2,500,000.00 £2,500,000.00
Payback of additional initial investment after 12 years.
£2,000,000.00 £2,000,000.00 £1,500,000.00 £1,500,000.00 £1,000,000.00 £1,000,000.00 £500,000.00 £500,000.00
2090
2088 2090
2086 2088
2086 2084
2084 2082
2082 2080
2080 2078
Lighting Costs
2078 2076
Adapted Cooli ngBuilding Costs
2076 2074
Standard Building Additi onal Investment Heati ng Costs
2074 2072
2072 2070 2070 2068 2068 2066 2066 2064 2064 2062 2062 2060 2060 2058 2058 2056 2056 2054 2054 2052 2052 2050 2050 2048 2048 2046 2046
2044 2044 2042 2042
2040 2040
2038 2038
2036 2036
2034 2034
2032 2032
2030 2030
2028 2028
2026 2026
2024 2024
2022 2022
2020 2020
2018 2018 2016 2016 2014 2014 2012 2012 2010 2010
£0.00 £0.00
Opportunities
Challenges
Simple, low cost measures incorporated at the
Lack of guidance
beginning of the design process can create robust, low energy buildings, future proof against climate change
Weather file Selection
Adoption of Passivhaus standards combines low energy buildings with excellent summer comfort
An integrated project team applying good practice building physics is key to enable architecture to perform in present and future climates
Swim4Exeter (D4FC 2) 60% Energy reduction and excellent summer comfort without air conditioning Exeter Extra Care (D4FC 1) Vulnerable user group Air conditioning could be avoided into 2080 with a passive approach
Compatibility with current good practice guidance Late consideration of climate change risks
PassivOffices (D4FC 2) Low energy use and excellent summer comfort without air conditioning
Thank You Swim4Exeter (D4FC 2) 60% Energy reduction and excellent summer comfort without air conditioning Exeter Extra Care (D4FC 1) Vulnerable user group Air conditioning could be avoided into 2080 with a passive approach