Objective
INTERNAL COMBUSTION ENGINE DRIVEN COMPRESSOR HEAT PUMPS HAVE A HIGHER EFFICIENCY THAN ELECTRICAL HEAT PUMPS DUE TO WASTE HEAT RECOVERY FROM THE COMBUSTION ENGINE. THE HEAT OUTPUT CAN ALSO BE VARIED MORE EASILY BY REGULATING THE SPEED OF THE MOTOR AND SWITCHING OFF ONE OR POSSIBLY MORE CYLINDERS OF THE COMPRESSOR. THE HEAT OUTPUT CAN THUS BE MATCHED TO THE HEAT REQUIREMENTS OF THE HOUSE WHICH LEADS TO ENERGY SAVINGS. THIS TYPE OF HEAT PUMP WAS UP TILL NOW LIMITED TO LARGE INSTALLATIONS ABOVE 100 - 200 KW. FICHTEL & SACHS DEMONSTRATED THE TECHNICAL FEASIBILITY OF A SMALL 20 KW INTERNAL COMBUSTION ENGINE (ICE) DRIVEN HEAT PUMP. THE HEAT OUTPUT CAN BE REGULATED BY VARYING THE SPEED OF THE MOTOR AND BY SWITCHING OFF ONE OF THE TWO COMPRESSOR CYLINDERS. THIS IS DONE WITH A MICRO PROCESSOR WHICH ALSO TAKES INTO ACCOUNT THE OUTDOOR TEMPERATURE AND THE HEAT DEMAND OF THE HOUSE. MONOVALENT OPERATION WAS SHOWN TO BE POSSIBLE DOWN TO - 15 DEGREES C OUTSIDE TEMPERATURES. THE HEAT IS DELIVERED AT 80 DEGREES C WHICH MAKES THE HEAT PUMP SUITABLE FOR RETROFITTING IN EXISTING HOUSES. TEN OF THESE HEAT PUMPS HAVE BEEN USED IN HOUSES AND THREE HEAT PUMPS WERE TESTED IN THE LABORATORY. THE MAXIMUM OPERATION TIME IS 12 000 HOURS. FROM THE VERY LIMITED WEAR FOUND UP TILL NOW, A LIFETIME OF 40 000 HOURS IS EXPECTED. THE COST IS ESTIMATED TO BE 20 000 DM AMD THE PAYBACK TIME 5 YEARS. TAKING INTO ACCOUNT ALL LOSSES A SEASONALLY COP OF 1,3 TO 1,35 WAS OBTAINED.
THIS PROJECT HAS A FOLLOW-UP IN A CEC DEMONSTRATION PROJECT WHERE THE ECONOMIC AND TECHNICAL FEASIBILITY WILL BE DEMONSTRATED (40 HOUSES).
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Programme(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Coordinator
8720 SCHWEINFURT
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.