What can we learn from the commercial sector and building modelling

Transcription

1 What can we learn from the commercial sector and building modelling Chris Twinn FRSA HonFRIBA FCIBSE MEI CEng BSc(Hons) Founder & CEO of Buildings that do not cost the Earth

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3 This is how energy efficient the building is. This is how energy efficient the building is. Gas 3

4 Game Boy heroes deliver on code compliance 4

5 Game Boy does not need reality Step 1 - Choose your software vendor 5

6 Ratio between reference model and design model Step 2 Maximise your reference model energy use 6

7 Fitout assumptions Step 3 Enhance your fitout energy use 7

8 kwh/m 2.yr (exc small power) Cooling Fans & pumps Heating Misc Lighting Maximise daylight Step 4 Daylight Quantity not Quality 2% Daylight Core Measured energy data 8

9 kwh/m 2.yr (exc small power) Cooling Fans & pumps Heating Misc Lighting Maximise daylight Step 4 Daylight Quantity not Quality 2% Daylight Core Step 5 Dilute perimeter cooling effects across full floorplate Measured energy data 9

10 Extent of AirCon Step 6 Maximise the extent of AC in your reference model 10

11 Your EPC is the ratio between your reference model and your design Step 7 As a basic gaming principle add more complexity to your reference model as it increases the options for saving energy with controls in your design model 11

12 Your EPC is the ratio between your reference model and your design Step 7 As a basic gaming principle add more complexity to your reference model as it increases the options for saving energy with controls in your design model Rest assured that no one can check the actual completed building against your code compliance modelling Energy modelling is code compliance it is not a design tool - It is not the expected actual energy use of your building 12

13 This is how energy efficient the building is. This is how energy efficient the building is. Gas 13

14 Chris Twinn v10 Incompatible with low energy Innovation Smaller infrastructure Personalised tablet desktop IT Cloud servers Monitoring + targeting Wireless interface Daylight Quality - not Quantity, for window design Occupant control : productivity New design rules for pumps, fans, controls, fitout Passive cooling & low capacity systems LED Task lighting Low energy corralled equipment Beyond 14

15 可 控 能 源 Regulated energy 不 可 控 能 源 Unregulated Innovation benefits: Zero Carbon for less cost than BAU? 参 考 : 城 市 精 装 修 三 层 办 公 楼 Ref: Urban 3 storey grade A office with Cat B fitout 能 耗 Energy 2010 年 符 合 规 范 的 建 筑 2010 Regs IT server power Server AC Plug power Misc other Lighting Fans & pumps 装 修 特 色 建 筑 设 计 特 色 减 少 成 本 特 色 Smart IT: tablet & Thin client Mobile & Cloud computing Task lights + fewer fixed lights In-slab cooling (& heating) Added insulation & airtightness 30% glazing high performance Ready for adding operable windows Enhanced ceiling slab finish Design-out external shading Simple cladding Reduced storey height Reduced size central plant Omit FCUs & simplified systems No dropped ceiling Feed-in-tariff 电 价 补 贴 施 工 成 本 Capital cost Zero Carbon 2010 年 符 合 规 范 的 建 筑 2010 Regs Electrical HVAC Internal surfaces etc Envelope Cooling Heating & DHW Roof area PV Biomass boiler Structure Misc Prelims & BWIC 145kWh/m 2 65kWh/m 2 现 场 可 再 生 能 源 Renewables kwh/m /m /m 2 15

16 BUILDING ZERO CARBON THE CASE FOR ACTION Where is Part L :2013 in relation to 2019 zero carbon? The UKGBC Zero Carbon Non-domestic Task Group Developing the definition of zero carbon Putting a scale of the various steps Emerging ideas on how building design can evolve 1 CAMPAIGN FOR A SUSTAINABLE BUILT ENVIRONMENT 2013 UK Green Building Council Registered charity number

17 Future A ZERO CARBON ROADMAP Performance Gap Zero Carbon Embodied CO ? Zero carbon = regulated + unregulated + embodied energy + Zero Carbon (whole life) 2025? Zero carbon = regulated + unregulated + embodied energy Zero Carbon (embodied) 2022? Predicted actual operational energy use Zero carbon = regulated + unregulated energy Agreed embodied CO 2 standard widely adopted across industry Zero Carbon (unregulated) 2019 Feedback from DECs Zero carbon = regulated energy only Part L % to -40% + Allowable Solutions Zero Carbon (regulated) Optional enhancement to SBEM to more accurately predict energy usage Part L % to -30% + lifts + escalators + door heaters Part L % Increasing industry alignment on methodology and assessment techniques Expanded regulated CAMPAIGN FOR A SUSTAINABLE BUILT ENVIRONMENT 2013 UK Green Building Council Registered charity number

18 THE CASE FOR ACTION: RECOMMENDATIONS 1. Government should restate its commitment to Zero Carbon non-domestic buildings for DECC, BIS and CLG to work with industry on roadmap to 2019 & beyond 3. The Impact Assessment methodology used by Government should be revised 4. Form a Zero Carbon Non-Domestic Buildings Hub 5. Zero carbon definition similar model to residential sector 6. Regulated energy in 2016 extended to cover more fixed building services 7. Encouragement to measure and reduce embodied carbon 8. SBEM should be developed for more accurate predictions of energy use 9. Industry-wide measurement and disclosure of operational energy use 10.Potential implementation of simpler compliance for simple buildings CAMPAIGN FOR A SUSTAINABLE BUILT ENVIRONMENT 2013 UK Green Building Council Registered charity number

19 THE ZERO CARBON DEFINITION A zero carbon non domestic building should: Have a high level of building fabric efficiency Incorporate efficient mechanical systems and cost effective renewable technologies Allow for off-site provision to meet net zero carbon target CAMPAIGN FOR A SUSTAINABLE BUILT ENVIRONMENT 2013 UK Green Building Council Registered charity number

20 Chris Twinn 9 Dec 2013 v5 Proposals to be tested & developed: 3. Part L 2019: Zero Carbon Regulated Energy Site practicality and economics define proportion of purchased Allowable Solutions or on-site renewables using FIT. 2. Part L defines max kwh/m 2.yr by building type. Dynamic simulation route uses standard use profiles & is permitted to relax individual elemental values by 20% (as backstops) 1. Part L defined fabric & systems min efficiencies Includes solar, U-values x areas, Plant installed capacity, plant efficiencies, vertical transportation, car parks, fans, pumps, chillers, over-door heaters, etc. Off-site Allowable Solutions Carbon Mitigation on-site /connected Deemed to satisfy if building all as Elemental Elemental Efficiency Fabric, envelope, simple M&E systems/components Simple and small buildings Single model dynamic simulation Building Baseline Energy Max targeted energy use Complex buildings Part L compliance routes Unregulated energy includes the associated cooling energy (& fans etc) for everything in excess of what is in Building Baseline. 20

21 What can we learn from the commercial sector and building modelling In summary: Game Boy rules OK Beware of unintended consequences Ensure engineering judgement underpins the process Real energy use is dependant on a series of different stakeholders Sustainability is about using less materials to deliver the economic prosperity & social amenity society requires Buildings that do not cost the Earth