基于火用分析的太阳能热泵系统优化研究

Optimization on solar-assisted heat pump system based on exergy analysis

该文以热力学第一、第二定律为指导,建立了非直膨式太阳能热泵系统各部件的火用模型。根据系统投入火用的特点,首次提出代价火用效率(即收益火用与代价火用之比)作为太阳能热泵系统的优化指标。将其应用于北京某别墅太阳能热泵系统优化设计分析中,获得此建筑太阳能热泵系统太阳能集热器面积与储水箱容积的最佳配比,计算结果表明优化后代价火用效率提高了15%。研究结果为该系统在设计和运行方面提供了一定理论依据。

Based on the first and second law of thermodynamics,exergy models of the non-direct expansion solar heat pump system are established here.According to the system input exergy characteristics,this paper proposes the cost exergy efficiency for the first time,which is the ratio of output exergy and cost exergy(electric energy and conventional energy),and uses it as the optimization index of solar heat pump system.Taking a villa in Beijing as an example,this paper applies the cost exergy efficiency in design optimization analysis of solar heat pump system and obtains the optimum proportion of the solar collector area and the storage water tank volume.The calculation results show that the cost exergy efficiency increases by 15 percent after the optimization.The research results provide a theoretical basis for design and operation of the system application in Beijing region.