内置热泵的热电冷联合有机朗肯循环能效分析

摘要

The combined cooling heat and power-organic Rankine cycle(CCHP-ORC) system is analyzed in this paper. The CCHP-ORC system is droved by small solar power equipment and installed with heat pump. Compared with the common CCHP-ORC system, it is more efficient in utilizing the low grade energy. As an ejector is used to replace the compressor of the heat pump in the CCHP system, the heat pump and the ORC are combined in one cycle. The energy utilization performance of the CCHP system is enhanced by the heat pump. The thermodynamic calculation is done under the conditions of constant temperatures of heat source, demand and environment. The system working medium is R245fa. Taking the combined heat and power cycle as an example, the best working parameter is solved under the given conditions. Contrasted with other CCHP-ORC system, the heat pump can greatly enhance the energy utilization performance of the CCHP-ORC system.%文章对内置热泵结构的小型太阳能驱动的热电冷联合有机朗肯循环(Combined Cooling Heat and Power-Organic Rankine Cycle,简称CCHP-ORC)系统进行了热力分析,与一般CCHP-ORC系统相比,该系统利用低品位能源利用效率更高.CCHP系统用引射器代替热泵压缩机,将热泵与ORC合并,热泵系统的加入提高了CCHP系统能量利用率.系统热力计算将系统高温热源、环境温度和需求温度固定,采用R245fa作为系统工质,以热电联合循环为例对系统进行热力计算,得到了在给定条件下系统的最佳工作参数.通过对比可知内置热泵能较大提高CCHP-ORC系统的能量利用率.