In this study, the part-load performance of a gas engine-driven heat pump (GHP) system for cooling application was studied. A novel energy-efficient air source GHP experimental setup was designed based on the use of scroll compressors with R410A. The waste-heat-recovery efficiency (Î·h) under different engine speed Neng (1200-2400 r/min) was studied under the no-load operation of the engine. The experimental study on part-load characteristics of the GHP system was carried out under the cooling load rates (Lperc) of 25 %, 50 %, 75 %, and 100 %. The results show that the Î·h of the GHP system is between 53.8% and 59.6% under different Neng. With the increase in Lperc, the values of Qc, Pgas, and Pcomp all increase gradually, whereas PER, PERall, and Pcomp initially exhibit an increasing trend, and subsequently, exhibit a decreasing trend. It shows that the GHP system has higher energy efficiency at middle part-load during cooling operation. The values of IPLVCOP and IPLVPER in the GHP system are 4.435 and 1.256, respectively, which indicates that the GHP system has an efficient integrated part-load performance.
Keywords gas engine-driven heat pump, part-load, IPLV, primary energy ratio, distributed energy system