热回收燃气热泵的性能模拟研究

Performance Simulation Study of Heat Recovery Gas Heat Pump

以带热回收的燃气热泵为研究对象,建立供冷与制热水的数学模型,分析了标准设计工况和变工况下,燃气热泵系统的制冷系数(COP)和一次能源利用率(PER)随轴功率的变化情况。在夏季典型运行工况下,COP和PER可以达到3.53和2.02。在变工况时,随着冷凝器入口温度的增加,COP和PER逐渐降低。模拟了有余热回收和无余热回收两种模式下PER的变化,结果显示两者差值达到0.73,余热回收对系统的能源利用影响明显。

Taking gas heat pump with heat recovery as the research object,the math-ematical model of cooling and heating water is established,and performance of a gas-fired heat pump system with respect to its COP and PER versus shaft power under the standard design condition and off-design condition are analyzed.Under typical summer operating con-ditions,COP and PER values of 3.53 and 2.02 can be achieved.At variable operating con-ditions,COP and PER gradually decrease as the condenser inlet temperature increases.The variation of PER in two modes,with and without waste heat recovery,is simulated,and the results show that the difference between the two models reaches 0.73,the waste heat recov-ery has a significant impact on the energy utilization of the system.