Research on the energy loss characteristics of heat pump

In this paper, we had a detailed analysis on the energy loss of heat pump system, and we found that compressor and expansion valve are the main links of the energy loss, which had been proved during experiments. Meanwhile,we proposed the idea of establishing a perfect evaluation system for heat pump, with the penumatic power proposed by Professor Cai Maolin. The system can measure the specific energy loss every part in heat pump system, it can help us to find the corresponding improve measurement, againing the high COP finally. In order to reduce the energy loss of expansion valve, we propose two structures in this paper. That are Motor-compressor Joint Shaft Mechanism and Reciprocating Cylinder Pressure Energy Recovery Sector. The two sectors can recycle the expansion energy of the refrigerant to the compression process. The recovery of pressure energy can be achieved. Once the structure proved to be successful, the application of heat pump will be changed, which can bring enormous economic and social benefits.