Experimental Research Of Seasonal Performance Of Gas Engine-Driven Heat Pump Water Heater

Gas Engine-Driven Heat Pump Water Heater (GEHPWH) is a high performanceand environment friendly equipment with brighter prospect that not only supplyingheat capacity in winter and cool capacity in summer but also supplying hot water for awhole year. Theoretical and experimental study has been carried out to research theseasonal running mode and seasonal performance of GEHPWH.Firstly, A GEHPWH was designed and built to experimentally test its heating andcooling performance under different seasonal operating modes, an index seasonalprimary energy ratio (SPER) was presented to evaluate the whole system performance.The experimental results show that the SPER is2.16for providing cooling air anddomestic hot water simultaneously in summer, which can be up to46.9%higher thanthe running mode of providing domestic hot water only. In spring and autumn, thehighest SPER is about1.99when the GEHPHW is used to provide hot water as wellas fresh air. In winter, the SPER is about1.82since the double requirements of bothheating space and water, which is15.9%higher than running mode of providingdomestic hot water only.Secondly, integrated primary energy ratio (IPER), a new evaluation method ofseasonal performance for GEHPWH was presented. This method could overcomeboth the inaccuracy of the PER and the complexity of SPER. The experimental resultsshow the error between IPER and SPER is only3.8%.Thirdly, thermo economic analysis had been done to compare the performance ofGEHPWH with traditional mode. The analysis results show that the cost of gas is￥746per year using the GEHPWH provide energy. However, the cost of electriccharge and coal is￥2733per year. Thus, the GEHPWH system could save￥1987per year than the traditional mode, which is72.7%of total cost.Lastly, comparison of primary energy ratio and theoretical analysis between GasEngine-Driven Heat Pump Water Heater (GEHPWH) and Gas Absorption Heat PumpWater Heater (GAHPWH) had been done under the heating mode. The comparisonresults show that when ηe+ηr=η, GEHPWH and GAHPWH have the sameperformance. When ηe+ηr>η, the performance of GEHPWH is better than GAHPWH.When ηe+ηr<η, the performance of GEHPWH is worse than GAHPWH.