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提出一种用于住宅采暖和全年提供生活热水的太阳能辅助CO2热泵供热系统,并将该系统运用于上海地区一座90 m2的示范住宅。其中,真空管集热器阵列的面积为40 m2,CO2热泵压缩机的额定功率为2 k W。通过冬季试验对系统进行性能测试。并在此基础上,运用TRNSYS软件建立系统模型,对包括蓄热水箱容积和工作水箱容积等系统的结构参数进行优化分析。结果表明:在环境温度为4.8℃、机组进出口水温37.9℃和48.6℃的实验工况下,CO2热泵机组的COP可达2.63,CO2热泵单独供热模式的系统性能系数COPS可达2.24;在该文实验工况下,太阳能采暖模式的系统性能系数COPS为14.53;当蓄热水箱和工作水箱的容积分别为0.9 m3和0.7 m3时,系统在整个采暖季的耗电量最小且太阳能的保证率达到65.7%。
Proposed a solar assisted CO2 heat pump heating system for residential heating and domestic hot water supply throughout the year, and applied the system to a 90 m2 demonstration residential area in Shanghai. Among them, the vacuum tube collector array area of 40 m2, CO2 heat pump compressor rated power of 2 kW. The system is tested for performance through winter trials. On this basis, the system model was established by TRNSYS software to optimize the structural parameters of the system including the capacity of regenerative water tank and working tank volume. The results show that under the experimental conditions of ambient temperature of 4.8 ℃ and inlet and outlet water temperatures of 37.9 ℃ and 48.6 ℃, the COP of the CO2 heat pump unit can reach 2.63. The COPS of CO 2 heat pump alone can reach 2.24. Under the experimental conditions, the system performance coefficient COPS of solar heating mode is 14.53. When the capacity of heat storage tank and working water tank are 0.9 m3 and 0.7 m3 respectively, the system consumes the least amount of electricity during the whole heating season and the solar energy Guaranteed rate of 65.7%.