NBS-3B1Y Strategic Corporate Sustainability 9 rd December 2014

1. NBS-3B1Y Strategic Corporate Sustainability 9rd December 2014 Low Carbon Strategies at the University of East Anglia Recipient of James Watt Gold Medal 5th October 2007 Keith Tovey (杜伟贤)M.A., PhD, CEng, MICE, CEnv Reader Emeritus in Environmental Sciences k.tovey@uea.ac.uk

2. NBS-3B1Y Strategic Corporate Sustainability Access to this presentation and numerous links relating to Energy may be found at http://www2.env.uea.ac.uk/energy/energy.htm or http://www.uea.ac.uk/~e680/energy/energy.htm

3. NBS-3B1Y Strategic Corporate Sustainability • Links to Energy Related Sites • Powerpoint Presentation of Energy Supply at UEA and Strategies for Low Carbon at UEA [this presentation] • Video Clips of Biomass System and also Carbon Footprinting of BBC Studios - [given today] • Powerpoint of challenges facing UK Energy Supply – [given tomorrow] • Recent Government Documents on Energy including Consultations and responses by N.K.Tovey • Papers written by N.K. Tovey relating to Energy and Carbon including reports on UEA Energy • Sustainability Report relating to several branches of an International Bank. • Return to Main UEA Energy Page

4. Low Carbon Strategies at the University of East Anglia • Today’s Session • Introduction and Background to Energy Supply at UEA • Low Energy Buildings and their Management • Low Carbon Energy Provision • Photovoltaics, CHP, Adsorption chilling • Biomass Gasification • Tomorrow’s Session • Energy Security: Hard Choices facing the UK • The Energy Tour – ensure you are not wearing open sandals/shoes • Elizabeth Fry building & ZICER • Questions & Answers • If time permits: - FRACKING – A solution to UK Energy Problems or an unacceptable step too far?

5. Teaching wall Library Student residences Original buildings 5

6. History of Energy Supply at UEA • Early 1960s: central boiler house built with three 8MW boilers providing water at 105 – 115o C at 10 bar pressure to circulate around the campus. • Fuel used: heavy residual oil • 1984: small 4 MW boiler was added • 1987: interruptible gas was provided so boiler could run on either heavy fuel oil or gas. • 1997/8: one 8 MW boiler removed and 3 1 MW CHP plants installed • 2002: remaining heavy fuel oil provision converted to light oil • 2006: Absorption Chiller installed • 2010: Biomass Plant installed • Most buildings on campus have heat provision from central boiler house. • Exceptions: Elizabeth Fry, Queens, EDU, Nelson Court, Constable Terrace.

7. Nelson Court楼 Constable Terrace楼 7 7

8. Low Energy Educational Buildings Nursing and Midwifery School Thomas Paine Study Centre ZICER Elizabeth Fry Building Medical School Phase 2 Medical School 8 8

9. Constable Terrace - 1993 • Four Storey Student Residence • Divided into “houses” of 10 • units each with en-suite facilities • Heat Recovery of body and cooking • heat ~ 50%. • Insulation standards exceed 2006 • standards • Small 250 W panel heaters in • individual rooms. 9

10. Educational Buildings at UEA in 1990s Queen’s Building 1993 Elizabeth Fry Building 1994 Elizabeth Fry Building Employs Termodeck principle and uses ~ 25% of Queen’s Building 10

11. The Elizabeth Fry Building 1994 Cost ~6% more but has heating requirement ~20% of average building at time. Significantly outperforms even latest Building Regulations. Runs on a single domestic sized central heating boiler. 11

12. Conservation: management improvements Careful Monitoring and Analysis can reduce energy consumption. .

13. Comparison with other buildings User Satisfaction thermal comfort +28% air quality +36% lighting +25% noise +26% A low Energy Building is also a better place to work in. Carbon Dioxide Performance Energy Performance 13

14. ZICER Building • Heating Energy consumption as new in 2003 was reduced by further 57% by careful record keeping, management techniques and an adaptive approach to control. • Incorporates 34 kW of Solar Panels on top floor Won the Low Energy Building of the Year Award 2005

15. The ground floor open plan office The first floor open plan office The first floor cellular offices

16. The ZICER Building – • Main part of the building • High in thermal mass • Air tight • High insulation standards • Triple glazing with low emissivity ~ equivalent to quintuple glazing

17. Operation of Main Building Regenerative heat exchanger Incoming air into the AHU Mechanically ventilated that utilizes hollow core ceiling slabs as supply air ducts to the space

18. Operation of Main Building Filter 过滤器 Heater 加热器 Air passes through hollow cores in the ceiling slabs 空气通过空心的板层 Air enters the internal occupied space 空气进入内部使用空间

19. Space for future chilling 将来制冷的空间 The return air passes through the heat exchanger 空气回流进入热交换器 Operation of Main Building Recovers 87% of Ventilation Heat Requirement. Out of the building 出建筑物 Return stale air is extracted from each floor 从每层出来的回流空气

20. Fabric Heating/Cooling: Importance of Hollow Core Ceiling Slabs Warm air Warm air Hollow core ceiling slabs store heat and cool at different times of the year providing comfortable and stable temperatures Air Temperature is same as building fabric leading to a more pleasant working environment Heat is transferred to the air before entering the room Slabs store heat from appliances and body heat. 热量在进入房间之前被传递到空气中 板层储存来自于电器以及人体发出的热量 Winter Day

21. Fabric Heating/Cooling: Importance of Hollow Core Ceiling Slabs Cold air Cold air Hollow core ceiling slabs store heat and cool at different times of the year providing comfortable and stable temperatures In late afternoon heating is turned off. Heat is transferred to the air before entering the room Slabs also radiate heat back into room 热量在进入房间之前被传递到空气中 板层也把热散发到房间内 Winter Night

22. Fabric Heating/Cooling: Importance of Hollow Core Ceiling Slabs Cool air Cool air Hollow core ceiling slabs store heat and cool at different times of the year providing comfortable and stable temperatures Draws out the heat accumulated during the day Cools the slabs to act as a cool store the following day 把白天聚积的热量带走。 冷却板层使其成为来日的冷存储器 night ventilation/ free cooling Summer night

23. Fabric Heating/Cooling: Importance of Hollow Core Ceiling Slabs Warm air Warm air Hollow core ceiling slabs store heat and cool at different times of the year providing comfortable and stable temperatures Slabs pre-cool the air before entering the occupied space concrete absorbs and stores heat less/no need for air-conditioning 空气在进入建筑使用空间前被预先冷却 混凝土结构吸收和储存了热量以减少/停止对空调的使用 Summer day

24. Good Management has reduced Energy Requirements 800 350 Space Heating Consumption reduced by 57% 能源消耗（kWh/天） 原始供热方法 新供热方法

25. Life Cycle Energy Requirements of ZICER compared to other buildings 与其他建筑相比ZICER楼的能量需求 自然通风221508GJ 使用空调384967GJ 建造209441GJ Materials Production 材料制造 Materials Transport 材料运输 On site construction energy现场建造 Workforce Transport劳动力运输 Intrinsic Heating / Cooling energy 基本功暖/供冷能耗 Functional Energy功能能耗 Refurbishment Energy改造能耗 Demolition Energy拆除能耗 28% 54% 51% 34% 29% 61%

26. Life Cycle Energy Requirements of ZICER compared to other buildings Compared to the Air-conditioned office, ZICER as built recovers extra energy required in construction in under 1 year.

27. Low Energy Buildings and their Management Low Carbon Energy Provision Photovoltaics CHP Adsorption chilling Biomass Gasification The Energy Tour Energy Security: Hard Choices facing the UK Low Carbon Strategies at the University of East Anglia 27

28. ZICER Building Photo shows only part of top Floor • Mono-crystalline PV on roof ~ 27 kW in 10 arrays • Poly- crystalline on façade ~ 6.7 kW in 3 arrays

29. Performance of PV cells on ZICER All arrays of cells on roof have similar performance respond to actual solar radiation The three arrays on the façade respond differently 29

30. 120 150 180 210 240 Orientation relative to True North 30

31. 31

32. Arrangement of Cells on Facade Individual cells are connected horizontally Cells active Cells inactive even though not covered by shadow If individual cells are connected vertically, only those cells actually in shadow are affected. As shadow covers one column all cells are inactive 32 32 32 32

33. Use of PV generated energy Peak output is 34 kW峰值34 kW Sometimes electricity is exported Inverters are only 91% efficient • Most use is for computers • DC power packs are inefficient typically less than 60% efficient • Need an integrated approach 33

34. 3% Radiation Losses 11% Flue Losses Gas Exhaust Heat Exchanger Engine Generator 36% Electricity 50% Heat Conversion efficiency improvements – Building Scale CHP Localised generation makes use of waste heat. Reduces conversion losses significantly 36% 61% Flue Losses 86% Heat Exchanger

35. UEA’s Combined Heat and Power 3 units each generating up to 1.0 MW electricity and 1.4 MW heat

36. Conversion efficiency improvements Before installation After installation This represents a 33% saving in carbon dioxide 36

37. Conversion efficiency improvements Load Factor of CHP Plant at UEA Demand for Heat is low in summer: plant cannot be used effectively More electricity could be generated in summer 37 37

38. 绝热 高温高压 Heat rejected High Temperature High Pressure 节流阀 Compressor 冷凝器 Throttle Valve Condenser 蒸发器 低温低压 压缩器 Evaporator Low Temperature Low Pressure 为冷却进行热提取 Heat extracted for cooling A typical Air conditioning/Refrigeration Unit

39. 外部热 Heat from external source 绝热 高温高压 Heat rejected High Temperature High Pressure 吸收器 Desorber 节流阀 冷凝器 Throttle Valve Condenser 热交换器 Heat Exchanger 蒸发器 低温低压 Evaporator Low Temperature Low Pressure W ~ 0 吸收器 为冷却进行热提取 Absorber Heat extracted for cooling Absorption Heat Pump Adsorption Heat pump reduces electricity demand and increases electricity generated

40. A 1 MW Adsorption chiller 1 MW 吸附冷却器 • Uses Waste Heat from CHP • provides most of chilling requirements in summer • Reduces electricity demand in summer • Increases electricity generated locally • Saves ~500 tonnes Carbon Dioxide annually

41. The Future: Biomass Advanced Gasifier/ Combined Heat and Power • Addresses increasing demand for energy as University expands • Will provide an extra 1.4MW of electrical energy and 2MWth heat • Will have under 7 year payback • Will use sustainable local wood fuel mostly from waste from saw mills • Will reduce Carbon Emissions of UEA by ~ 25% despite increasing • student numbers by 250%

42. Trailblazing to a Low Carbon Future Low Energy Buildings Photo-Voltaics Low Energy Buildings • Absorption Chilling • Advanced CHP using Biomass Gasification • World’s First MBA in Strategic Carbon Management • Low Energy Buildings • Effective Adaptive Energy Management • Photovoltaics • Combined Heat and Power Absorption Chilling Efficient CHP 42 42 42

43. Trailblazing to a Low Carbon Future Photo-Voltaics Absorption Chilling Efficient CHP Advanced Biomass CHP using Gasification 43 43 43

44. Trailblazing to a Low Carbon Future Efficient CHP Absorption Chilling 44 44 44

45. Conclusions • Effective adaptive energy management can reduce heating energy requirements in a low energy building by 50% or more. • Heavy weight buildings can be used to effectively control energy consumption • Photovoltaic cells need to take account of intended use of electricity use in building to get the optimum value. • Building scale CHP can reduce carbon emissions significantly • Adsorption chilling should be included to ensure optimum utilisation of CHP plant, to reduce electricity demand, and allow increased generation of electricity locally. • Promoting Awareness can result in up to 25% savings • When the Biomass Plant is fully operational, UEA will have cut its carbon emissions per student by over 70% since 1990. Finally! "If you do not change direction, you may end up where you are heading." LaoTzu (604-531 BC) Chinese Artist and Taoist philosopher