Abstract
To realize the stability and efficiency of the gas engine-driven heat pump, the cooling performance of system are studied. In this paper, the effects of gas engine and superheat (△Tsh) on system refrigerating capacity, refrigerant mass flow rate, gas consumption, compressor ratio, and system efficiency were researched. Then, taking the speed as the variable parameter, the optimal △Tsh in different working conditions were analyzed. The results showed that high speed is not conducive to the energy-saving operation of the system. In addition, when the △Tsh decreased from 13 °C to 6 °C, the system efficiency increased significantly. When the △Tsh was below 6 °C, the growth rate of efficiency decreased gradually. And there was an optimal △Tsh that made the highest efficiency. The optimal △Tsh increased with the increase of engine speed at the same temperature conditions. When the engine speed were 1200 rpm, 1400 rpm, and 1600 rpm, the optimal △Tsh of the system were 3.5 °C, 3.8 °C and 4.5 °C, respectively. And the corresponding primary energy ratio of system were 2.63, 2.40 and 2.17, respectively.
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