| The gas-engine heat pump water heater system uses the natural gas as primaryenergy input, which can provide the chilled water for buildings in the cooling season,the hot water in the heating season and provides living hot water for using all the yearround. In this paper, the gas-engine heat pump water heater system had been carriedon the theoretical simulation and experimental research.The mathematical model of gas engine and a heat pump system had beenestablished based on the gas-engine heat pump water heater system, and compared theresults of the mathematical model and the experimental data for the gas-engine heatpump water heater when the system working in the heating season of the year, theresults showed that the model can effectively predict the running characteristics of thegas-engine heat pump water heater system.A comparative study on the gas-engine driven heat pump water heater working inthe instantaneous heating mode and cyclic heating mode had been done to reserch theperformance characteristics of the system. In the experimental process, the effectfactors of the system’ performance characteristics such as environmental temperature,the condenser cooling water flow rate, degree of superheat and engine speed had beentaken into account, the results showed that the system had the higher PER when thesystem working in the instantaneous heating mode than that of cyclic heating mode.The parallel plate heat exchanger is used as condenser but not the finned tube heatexchanger for the gas-engine heat pump water heater in the cooling season, the hotwater can be made by the recovered condenser heat and the waste heat released by thegas engine when the system supply cooling for buildings. The results showed that thePER of the system improved obviously, even the gas-engine running at1900rpm, theminimum value of PER was1.79, which indicated the gas-engine heat pump waterheater can save energy remarkably.Based on meteorological statistical data of four cities, we calculated the coolingseasonal energy efficient ratio (SEER), cooling seasonal primary energy ratio(SPERr), heating seasonal performance factor (HSPF) and heating seasonal primaryenergy ratio (SPERh) of the gas-engine heat pump water heater.A comprehensive primary energy ratio (PERzh) was definied only considering engine speed and environmental temperature for the gas-engine heat pump waterheater, and which was used to evaluate the performance characteristic of the systemexcept the cooling and heating season of the year. Based on the experimental date, thecalculated PERzh value was1.453, which indicated the system had the higher primaryenergy utilization and energy saving effect was obviously. |
PDF Full Text Request