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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。
Aimed at the meteorological conditions of typical meteorological years in the Central Plains, the transcritical cycle heat pump system performance simulation platform was established to calculate and analyze the solar assisted R744 transcritical cycle and the operation of a single R744 heat pump system in the Central Plains. The variation of the coefficient of heating performance and the optimal exothermic pressure when the temperature of hot water outflow and the temperature difference of the heat transfer narrow point are changed are discussed. The results show that the performance of R744 heat pump system can be greatly improved in winter with the combined application of solar energy collector system under the set conditions, with an average increase of 34.4%. When the hot water outlet temperature is lower than 70 ℃, the performance of the system increases by more than 36.0%. However, the temperature difference between heat transfer narrow spots increased and the system performance declined to a certain extent.