太阳能-土壤储热方式的研究

Study on Solar-soil Heat Storage Mode

太阳能-土壤储热是解决地源热泵热源不足问题的重要措施。储热方式不同,集热量、储热量和储热能效比也不同。实验结果表明:当日总辐照量由10 MJ/m^(2)增加至30 MJ/m^(2)时,直接储热模式下日均集热效率由0.4747增长至0.5021,日总储热量由63.10 k W·h增长至208.90 k W·h;间接储热模式下日均集热效率由0.3598增至0.5072,日总储热量由53.53kW·h增长至195.81kW·h;当日总辐照量高于13.94MJ/m^(2)时,间接储热模式下日均热损率大于直接储热模式日均热损率,且差值逐步增大;直接储热模式日均储热能效比随日总辐照量变化但维持在35以上,而间接储热模式的日均储热能效比范围为15.54~17.28;直接储热模式在张北县更加适用,可以有效提高系统在非供热季的运行效率。

Solar-soil heat storage is an important measure to solve the problem of insufficient heat source of ground source heat pump.The different ways of heat storage will affect the difference of heat collection,heat storage and heat storage efficiency ratio.The experimental results show that when the total irradiation of the day increases from 10 MJ/m^(2) to 30 MJ/m^(2),the average daily heat collection efficiency under the direct heat storage mode increases from 0.4747 to 0.5021,and the daily total heat storage increases from 63.10 kW·h to 208.90 kW·h;under the indirect heat storage mode,the average daily heat collection efficiency increased from 0.3598 to 0.5072,and the total daily heat storage increased from 53.53 kW·h to 195.81 kW·h;when the total irradiation of the day is higher than 13.94 MJ/m^(2),the average daily heat loss rate under the indirect heat storage mode is higher than that under the direct heat storage mode,and the difference gradually increases;the average daily heat storage efficiency ratio of the direct heat storage mode varies with the total daily irradiation but maintains above 35,while the average daily heat storage efficiency ratio of the indirect heat storage mode varies between 15.54-17.28;the direct heat storage mode is more applicable in Zhangbei County,which can effectively improve the operation efficiency of the system in non-heating seasons.