太阳能微通道分离式热管供暖系统实验研究

Experimental Study of Solar Micro Channel Separated Heat Pipe Heating System

以太阳能微通道分离式热管供暖系统为研究对象,通过实验与理论的方法研究了其在可观太阳辐射强度时的供暖性能.结果表明:系统的供热量、供热效率、上汽管和下液管压力、微通道散热器的压降及壁温、实验房间温度均受太阳辐射强度影响较大,受室外温度影响较小,且其变化较太阳辐射强度均存在约15 min的时间延迟.此外,晴天或晴间多云时,在光强较大的10:00至15:00之间,该系统单独运行即可满足室内供暖需求,且系统压力在0.4~0.8 MPa之间变化;微通道散热器平均压降范围为2.1×103~5×103Pa;微通道散热器平均壁温最低为20.7℃,最高可达38.4℃;系统平均每秒供热量最低为343.7 J,最高可达424.1 J,室内温度始终可维持在18.3~26.7℃之间;系统平均供暖效率在30.4%~45%之间.此外,系统中除冷凝器风机消耗少量电能外,并无其他动力设备,故其COP理论上无限大,是一种节能效果显著的辅助供暖系统.

Taking solar micro channel separation heat pipe heating system as the study object,the paper studies the heating performance of the system at appreciable solar radiation with experimental and theoretical methods. The results show that the heating load and the efficiency of the system,the pressure of gas supply pipe and liquid return pipe,the pressure drop and wall temperature of the micro channel radiator and the indoor temperature are affected greatly by solar radiation intensity,and are less affected by outdoor temperature. Moreover,they all lag behind the variation of solar radiation intensity about 15 minutes. In addition,between 10: 00 and 15: 00 when it is a partly cloudy day and a sunny day,the separate operation of the system can meet the indoor heating demand and the system pressure varies from 0.4 to 0.8 MPa. During this time,the average pressure drop range is 2.1×103~ 5×103 Pa,the minimum average wall temperature of the micro channel radiator is 20.7 ℃,while the maximum is 38.4 ℃ when the indoor temperature is maintained at 18.3 ~ 26.7 ℃. As well as the average lowest and highest value of the system heat load per second are 343.7 J and 424.1 J respectively,the average heating efficiency of the system is between 30.4% ~ 45%. What's more,there is no other power equipment in the system except condenser fan. Therefore,the system has an infinite COP,which is taken as a significant energy-saving auxiliary heating system.