低温环境下复叠式燃气机热泵的供热性能研究
Research on Heating Characteristics of Cascade Gas Engine-driven Heat Pump in Low-temperature Environment

为了提高燃气机热泵在低环境温度下的制热性能，本文将燃气机热泵技术与复叠式热泵技术相结合，提出了应用于低环境温度下的复叠式燃气机热泵（CGEHP）系统。使用MATLAB软件，建立了CGEHP数学模型。分析了燃气发动机转速、环境温度和系统进水温度对系统供热性能（总供热量、制热性能系数（COP）以及一次能源利用率（PER））的影响规律。结果表明：当环境温度分别为﹣20、﹣15和﹣10 ℃，以NH3-LiNO3作为吸收式热泵系统工质，发动机转速为1 500 r/min时，PER分别为1.0、1.02、1.04，比常规空气源电热泵系统分别提高了24%、15%、5%。
In order to improve the energy efficiency of gas engine-driven heat pump system in low-temperature environments, a cascade gas engine-driven heat pump (CGEHP) was designed based on the gas engine heat pump and the cascade heat pump technologies. The simulation model of the CGEHP was established and researched using MATLAB. The influencing rule of the coefficient of performance (COP) and primary energy ratio (PER) were analyzed under different conditions, such as gas engine speed, ambient air temperature, and cooling water inlet temperature. The results show that when the ambient air temperature is ﹣20 ℃, ﹣15 ℃, and ﹣10 ℃, with NH3-LiNO3 solution as the working pair of absorption heat pump subsystem and the gas engine speed is 1 500 r/min, the PER of the CGEHP is 1.0, 1.02, and 1.04 respectively, which was improved by 24%, 15%, and 5% respectively, compared with the conventional air source electric heat pump system