一种新型空气源高温热泵的热力学分析

Thermodynamic Analysis of a Modified Air Source High Temperature Heat Pump

本文提出了一种供热温度为80~100℃的新型空气源高温热泵循环(EIHP),该循环采用非共沸混合工质R290/R600a,利用内部自复叠技术和喷射器提升循环性能。针对EIHP循环建立了相应的热力学计算模型,并与传统热泵循环(CHP)进行了对比研究。根据计算结果,当冷凝器出口温度为100℃,蒸发器出口温度从25℃下降到-10℃时,相较于CHP循环,EIHP循环的COP提高了15%~27%,压缩机压比降低了20%~46%,容积制热量提高了22%~51%。此外,本文还研究了冷凝器出口温度,工质配比等参数对循环性能的影响情况。

This paper proposes a modified air source high temperature heat pump cycle(EIHP)with a heat sink temperature of 80~100°,in which the zeotropic mixture R290/R600 a is applied.In EIHP system,the internal auto-cascade technique and an ejector are used to enhance the system performance.Performance of EIHP is investigated by using a developed thermodynamic model.According to the simulation results,compared with the conventional heat pump cycle(CHP),as the evaporator outlet temperature ranges from 25℃to-10℃,EIHP yields 15%~27% higher COP,20%~46% lower compression ratio and 22%~51% higher volumetric heating capacity at a fixed condenser outlet temperature of 100℃.Moreover,in order to evaluated the system performances in detail,the other critical parameters are investigated in this study including condenser outlet temperature,refrigerant mass composition and so on.