Zhileng xuebao (Jan 2018)
Research on Heating Characteristics of Cascade Gas Engine-driven Heat Pump in Low-temperature Environment
Abstract
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.
