University of Cambridge Dept of Chemistry – Lensfield Road Energy Audit & Opportunities

1. University of Cambridge • Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Malcolm Tait of KJ Tait Engineers • Introduction • The Utility Challenge • M & E Power Consumption • ICT Power Consumption • Laboratory Power Consumption • Opportunities for Energy Reduction

2. University of Cambridge • Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • 27,000 sq.ft area • Built in 1950’s • Mixture of under-graduate and post-graduate research • Basement to Fifth Floor

3. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities Energy Consumption

4. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Data Gathering; • Visual Plate Surveys of Motors • Walkround with Lab Technicians • Plant Labelling/BMS/

5. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Fan Power Consumption

6. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Fan Energy • 108 m3/s supply air • 328 No fume cupboards • 3,273,348 kWh p.a • £283,500 p.a (fan energy)

7. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Pump Power

8. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Cooling Plant Total M&E Power

9. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities M&E Plant Electrical Consumption

10. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • ICT Loads a

11. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities HEEPI Input Data

12. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities Lab Equipment

13. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • HEEPI Lab Toolkit Initiative

14. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities

15. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Opportunity for Zone Presence Detectors on Fume Cupboards

16. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Opportunity for Zone Presence Detectors on Fume Cupboards Melville Lab – 10 No fume cupboards - with zps 112 Lab – 9 No fume cupboards - no zps

17. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities Opportunity for Zone Presence Detectors on Fume Cupboards 1 week test, monitoring comparative supply air volumes;

18. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities Opportunity for Zone Presence Detectors on Fume Cupboards Assumptions; 108 m3/s – total supply air into the building 328 fume cupboards @ 300l/s – 98m3/s Best case – install ZPS in all fume cupboards to reduce air volume by 50% Assume reduce supply fan power consumption by 33% - 454,545 kwh p.a - £39,363.00 Assume heat reduction for 50m3/s p.a; - 3,153,600 kwh p.a - £69,379 Total Potential Saving - £108,742 p.a

19. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities Other Potential Opportunities; LPHW Pumps at constant volume all year - change AHU’s to 2-port control - potential saving of £12k p.a Undergraduate labs run in setback mode All year - - switch off fume cupboards outwith term, saving of £20k Review ICT Cooling Strategy Review Split A/C Strategy Metering of Laboratory Equipment

20. Dept of Chemistry – Lensfield Road • Energy Audit & Opportunities • Other Opportunities • Record Documentation Collated • Common Referencing of Plant • The Need for a Building Log Book – collate design intent • Improved metering of AHU’s power consumption • Lab equipment – asset register • - meter

21. Further Energy Saving Opportunities Opportunity for Wind Responsive Fume Exhaust Control; • Adjust exhaust fan speed to reflect current wind conditions; • Reduce fan speed when wind speed is slow • Increase fan speed when wind speed is fast • Wind Responsive Systems Work Best When; • -low required building flows • -high frequency of low wind speeds • -directional conditions

22. Wind Responsive Fume Exhaust – USA Case Study

23. Wind Responsive Fume Exhaust – USA Case Study

24. Wind Responsive Fume Exhaust – USA Case Study

25. Wind Responsive Fume Exhaust – USA Case Study

26. Further Energy Saving Opportunities • Opportunity for Wind Responsive Fume Exhaust Control; • The Process; • Measure current fume exhaust outlet velocities • Commission wind tunnel simulations for reduced velocities against a range of wind conditions • Undertake physical visualisation tests to validate results • Re-commission fan control strategy • Cost of Process - £60k

27. Further Energy Saving Opportunities Opportunity for Wind Responsive Fume Exhaust Control; Assumption that every fume exhaust fan achieves a 33% reduction In energy consumption as a result of a wind responsive control regime; Annual saving in energy – 652027 kwh p.a. Annual cost saving - £56,456.00 p.a