Experimental study on the condensing heat recovery performance of air source heat pump

Energy recycling and sustainable development problem is imminent and condensing heat recovery technology in air source heat pump has received considerable development and application in recent years. In this article the experimental method is used to mainly explore the performance of four kinds of condensing heat recovery system (e.g. the static type, circulation, paraffin, copper foam/paraffin) in full and partial condensing heat recovery mode. The results show that in the full condensing heat recovery mode, four systems can obtain relatively high performance, but the systems’ performance rapidly decays with time and can't provide enough cooling capacity and hot water production due to the short running time. In partial condensing heat recovery mode, the four systems’ shows better system efficiency compared with the systems without condensing heat recovery. And the circulation system performance increases significantly, which comprehensive efficiency coefficient can reach 5.67 and the average system heat recovery rate is 44.0%. The two phase change heat storage system run steadily and the adding of foam metal copper to paraffin not only enhance the performance of the system but also improve the stability of the system operation.