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Efficiency expectations surpassed on field trials of heat recovery generator

Clean Power Technologies has announced the results from testing an installed Heat Recovery Landfill (HR-L 300) unit at a landfill site in Oxfordshire, UK in June 2010.

The unit produces electricity purely from the waste exhaust heat of a large combustion engine generator set operating on methane rich gas recovered from the decaying landfill.

Prior testing of the HR-L 300 unit on a large diesel engine in CPT’s test facilities had previously produced electrical outputs equating to an additional 8 per cent of the diesel engines operating power.

When installed on the landfill gas engine, the HR-L 300 produced an electrical power output of 26.7KW. With the landfill gas engine operating at 250KW, this equates to the CPT unit providing an additional 10.7 per cent increase in electrical power for export to the grid, a dramatic increase from the company's internal testing of more than 20 per cent.

CPT is currently preparing engineering upgrades to the HR-L unit to verify the performance with the landfill gas engine operating at 500KW, and expects that an output of 50KW can be comfortably achieved. Meanwhile the field trials of the HR-L unit are continuing with extended operation tests leading towards CPT’s target of continuous automatic operation.

Mike Burns, Chief Technology Officer of CPT said, “We are very pleased by these results – the high exhaust temperatures and flow rates of the methane gas powered engines suit our HR-L unit perfectly. We are already working on further engineering design refinements to the heat exchanger and operating systems and now see 10% as the new baseline figure from which we will improve further with the next production units.”

CPT is developing and producing its heat recovery technology for further agreed installations on landfill gas powered generators at sites in the UK. The technology can also be applied to increase the efficiency of combustion engine generators fuelled by biogas, natural gas and diesel, as well as producing power from biomass fuelled burners and flares. The HR-L unit produces electricity without additional fuel or emissions and with no back pressure or other detrimental effects to the efficiency of the combustion engine on which it is installed.

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