太阳能辅助R744热泵系统在中原地区的性能分析

Performance analysis on solar assisted R744 system in Zhongyuan region

中文关键词: R744(二氧化碳)  太阳能  热泵  跨临界循环  性能系数

英文关键词: R744 (carbon dioxide)  solar energy  heat pump  transcritical cycle  COP

中文摘要:

      针对中原地区典型气象年(辐射极大)的冬季气象条件,通过所建立的跨临界循环热泵系统性能模拟平台,计算并对比分析了太阳能辅助R744跨临界循环及单一R744热泵系统在中原地区的运行特性；讨论了热水出水温度、传热窄点温差改变时系统制热性能系数和最优放热侧压力的变化规律。研究结果表明,在设定工况下,联合应用太阳能集热系统,R744热泵系统性能在冬季可得到大幅度提高,平均提高34.4%；热水出水温度低于70℃时,系统性能提高幅度超过36.0%；但传热窄点温差增大,系统性能有一定程度下降。

英文摘要:

      A simulation platform of transcritical heat pump system performance was developed.Under the winter climate of a typical meteorological year in zhongyuan region (maximum radiation), the comparison of system performance of solar-assisted R744 and R744 heat pump were carried out. Under different outlet temperature of hot water and pinch point heat transfer temperature difference, the heating coefficient of performances and optimum heat rejection pressure of solar-assisted R744 heat pump were analyzed. The results show that the system performances of solar-assisted R744 heat pump can be considerably improved by a mean of 34.4% under the given working conditions. When the outlet temperature of hot water is lower than 70 oC, a larger improvement in system performance than 36.0% can be obtained while pinch point temperature difference has a relatively weak influence upon the system performances.