Performance analysis of a household gas engine driven heat pump at varied environment temperature

In order to analyze system performance, empirical equations were fitted with the operating performance curves of the system parts. By coupling the equations, the relationships of primary energy ratio (PER) and effective gas consume rate (EGCR) with environment temperature were obtained. The result shows that the system had its optimum performance at 33-35°C in summer and 0-5°C in winter. When the environment temperature diverged from the appropriate temperature, the EGCR of the system would increase and the PER of the system would decrease. The system PER in heating conditions is higher than that in refrigerating conditions. Its maximum system PER in heating condition is about 1.7 times that in refrigerating condition.