直膨式太阳能热泵集热/蒸发器性能优化及其低温适应性研究

RESEARCH ON OPTIMIZATION OF EVAPORATOR OF DIRECT EXPANSION SOLAR HEAT PUMP AND ITS LOW TEMPERATURE CHARACTERISTICS

摘要: 对直膨式太阳能热泵系统的集热/蒸发器结构进行优化,设计由六边形与四边形单元组合的流道结构,并进行仿真与实验研究。在上海地区,冬季工况下,将水温从10℃加热到50℃,系统COP可达到4.5;夏季工况下,将水温从30℃加热到55℃,系统COP可达到6.60。在此基础上,针对严寒地区冬季运行,研究了与喷气增焓循环耦合的低温型直膨式太阳能热泵系统。在环境温度为-10℃时,系统COP可达到3.79;环境温度为-20℃时,系统COP可达到3.69。依据实验与仿真数据,运用全生命周期经济性分析方法,以当量热价(LCoH)为评价指标,为太阳能热泵采暖经济性分析提供计算方法和理论依据。

Abstract: In this paper,the evaporator’s structure of DX-SAHP system,which is composed of hexagon and quadrilateral elements,is designed and optimized. In Shanghai,the maximum COP is about 4.5 in winter,while the maximum COP is about 6.6 in summer. On this basis,the coupled system of the DX-SAHP system and the enhanced vapor injection system is studied for the extreme cold weather.The COP can reach 3.79 when the ambient temperature is-10 ℃,and the COP can reach 3.69 when the ambient temperature is -20 ℃. Based on the above results,the economic method of life cycle analysis is applied. Take the levelized Cost of Heat as the evaluation index to provide the calculation method for the economic analysis of DX-SAHP heating.