太阳能CO_2热泵联合采暖运行特性研究

STUDY ON PERFORMANCE OF A CO_2 HEAT PUMP ASSISTED TEH SOLAR SYSTEM FOR HEATING

介绍一套以太阳能为主,CO2热泵机组为辅助热源的采暖系统。通过建立系统的数学模型,并对一套实际系统的现场测试,验证模型的可靠性。同时,分析太阳集热器面积对CO2热泵机组运行特性的影响。结果表明,在夜间无太阳辐射时,CO2热泵机组的功耗、制热量不随集热器面积的增加而变化;随着日间太阳辐射逐渐变大,功耗、制热量开始逐渐减少;对比集热面积为360m2和0m2时机组的制热系数,在太阳辐射最大的13∶00时,CO2热泵机组的COP提高了26.7%;一天平均提高17.3%;且系统的整体效率随集热器面积的增大也逐渐变大。

A set of solar-based primarily, C02 heat pump unit as a secondary heat source heating system was introduced. A mathematical model of the system was well-established, and by the data of field testing of a practical system verified, the mathematical model was reliable, and also the influence of the area of solar collectors to the characteristics of the CO2 heat pump units was studied. The results showed that in the absence of solar radiation, both the power consumption of the CO2 heat pump units and heat capacity will not vary with collector area. As the solar radiation increases, the power consumption and heating capacity were reduced gradually; comparing the heat transfer coefficient with collector area of 360m2 and 0m2, the COP of CO2 heat pump units increases with the percent up to 26.7% at 13：00 when the solar radiation maximum occurs. And the daily COP increases 17.3%. Furthermore the overall efficiency of the system increases with the increase of collector area.