1. 1/27 ea technology DCHP Field Trials Practical Experiences with the WhisperGen Project Manager : Rob Green Presented by Yvonne Dickson

2. 2/27 Overview Introduction to the WhisperGen History of EA Technology’s involvement WhisperGen & the Stirling Cycle Field trials Performance –Does it save money? –Does it reduce CO 2 emissions?

3. 3/27 Floor-mounted boiler replacement External combustion Stirling cycle What is the WhisperGen

4. 4/27 WhisperGen in the home

5. 5/27 Project History 1999 - studies of commercial viability 2000 - lab demo of Mk I WhisperGen 2001 - Mk I 3 trial houses + test house + lab endurance 2002 - alpha trial Mk II 13 houses + lab endurance (4) 2003 - beta trial Mk III 15 Chester + 13 Ipswich + lab (Mk II & III) 2003 / 4 - Mk IV pre-launch checks - 3 Chester houses

6. 6/27 Powergen market launch 2004 EA Technology training of installers Monitoring for Carbon Trust & DTI Project History (2)

7. 7/27 Piston Regenerator Gas Flame Cooling Circuit The Stirling Cycle Piston Gas

8. 8/27 The Stirling Cycle

9. 9/27 compression at constant temperature The Stirling Cycle

10. 10/27 displacement / regeneration at constant volume The Stirling Cycle

11. 11/27 expansion at constant temperature The Stirling Cycle

12. 12/27 displacement / regeneration at constant volume The Stirling Cycle

13. 13/27 WhisperGen & the Stirling Cycle

14. 14/27 WhisperGen Mk IV current – 0.85 kWe / 6 kW t – 1.2 kWe / 8 kW t Mk V soon – ~ 1 kWe / 7 kW t to ~ 1 kWe / 15 kW t

15. 15/27 The need for field trials Prototype: –Ease of installation –Reliability –Operational experience –Control systems –User acceptability –Performance / Economics –Improvements

16. 16/27 The need for field trials (2) Market ready: Carbon Trust –CO 2 emissions –Product accreditation DTI / electricity suppliers –Electricity metering / settlement

17. 17/27 EA Technology Field Trials

18. 18/27 What to measure? Electricity kWh –Generation –House in and out Heat output Gas input Temperatures?

19. 19/27 Findings Range of house types & occupancy patterns –Both affect run hours –Occupant behaviour – big variable Sales + Accreditation? User acceptability –Noise –Speed of response

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23. 23/27 Economics – does it save money? Well matched (application & engine) –£150 to £200 / year (~ €250 / year) Need long run hours –Occupancy pattern –House heat loss (need large houses) Mk V

24. 24/27  Government targets CO 2 -Global warming / Kyoto -dCHP high priority dCHP in context of house -60 WhisperGen sites to be monitored -40 Powergen -20 Northern Ireland Carbon Trust Monitoring Trial

25. 25/27 Carbon Trust Method Pulses (Gas, electric, heat) Temperatures Logger / receiver Telemetry system GSM

26. 26/27 Does it save CO 2 ? Comparing against? –Boiler (B rated 86%+, A rated ~93%) –Central power station If dCHP overall efficiency >= boiler efficiency –Obviously reduces CO 2 emissions If dCHP overall efficiency < boiler efficiency –Not so clear cut

27. 27/27 Conclusions WhisperGen is commercially available –Stirling Cycle, External Combustion Field trials are essential to prove: –Customer acceptability, reliability, use patterns export (utilisation) etc. etc. Occupant behaviour has a big effect Mk V should expand market for WhisperGen Saves CO 2 ? rob.green@eatechnology.com