套管式地埋管换热器换热能力影响因素分析  

Analysis of Influencing Factors of Heat Exchange Capacity of Casing Buried Tube Heat Exchanger

作　　者：胡志高 王彦芳 谢毅伟 宁轶 胡平放[2] 雷飞[2] 朱娜[2] HU Zhigao;WANG Yanfang;XIE Yiwei;NING Yi;HU Pingfang;LEI Fei;ZHU Na

机构地区：[1]湖北风神净化空调设备工程有限公司,湖北武汉430014 [2]华中科技大学环境科学与工程学院,湖北武汉430074 [3]中海地产(佛山)有限公司,广东佛山528200

出　　处：《煤气与热力》2021年第5期6-8,I0041,I0042,共5页Gas & Heat

摘　　要：采用模拟方法,对套管式地埋管换热器换热能力的影响因素进行研究。套管式地埋管换热器的工作起始时间从1 h开始,结束时间为8760 h。供暖期为1~1536 h、7896~8760 h,供冷期为3192 h~6552 h。供暖期、供冷期以外时间,土壤温度自然恢复。定进出水平均温度条件下:供暖期进出水平均温度首次达到9.5℃时,取热流量为11.89 kW,为第14 h。随后,取热流量减小,土壤平均温度下降,第1536 h的取热流量降至3.85 kW。供冷期进出水平均温度首次达到32.5℃时,排热流量为13.32 kW,为第3210 h。随后,排热流量减小,土壤平均温度升高,供冷期结束时(第6552 h)的排热流量降至4.18 kW。下1个供暖期开始后(第7896 h),供暖期进出水平均温度首次达到9.5℃时,取热流量为13.87 kW。随后,取热量减小,土壤平均温度下降。定进水温度条件下:钻孔深度一定时,循环介质流速越大,套管式地埋管换热器的换热能力越强。循环介质流速由0.2 m/s增至0.7 m/s,最大取排热流量增幅达到45%,而最小取排热流量增幅仅为12%~15%。在取热、排热末期,土壤内冷热聚集达到最大,即使增大循环介质流速,对提高取排热流量的帮助也不明显。循环介质流速一定时,钻孔深度越大套管式地埋管换热器的换热能力越强。钻孔深度由90 m增至120 m,最大、最小取热量分别增加25.0%、27.5%,最大、最小排热量分别增加20.6%、19.9%。The simulation method is used to study the influencing factors of the heat exchange capacity of the casing buried tube heat exchanger.The working start time of the double-pipe underground heat exchanger started from 1 h and the end time was 8760h.The heating period was 1 to 1536 h and 7896 to 8760h,and the cooling period was 3192h to 6552h.Outside the heating period and cooling period,the soil temperature naturally recovered.Under the condition of constant inlet and outlet water temperature:when the average temperature of the inlet and outlet water reached 9.5℃for the first time during the heating period,the heat extraction flow rate was 11.89 kW,which was the 14th h.Subsequently,the heat extraction flow rate decreased,and the average soil temperature dropped,and the heat flow rate at the 1536th h decreased to 3.85 kW.When the average temperature of the inlet and outlet water reached 32.5℃for the first time during the cooling period,the heat rejection flow rate was 13.32 kW,which was the 3210th h.Subsequently,the heat rejection flow rate decreased,the average soil temperature raised,and the heat rejection flow rate(6552nd h)dropped to 4.18 kW at the end of the cooling period.After the start of the next heating period(7896th h),when the average temperature of the inlet and outlet water reached 9.5℃for the first time during the heating period,the heat extraction flow rate was 13.87 kW.Subsequently,the heat extraction flow rate decreased,and the average soil temperature dropped.Under the condition of constant inlet water temperature:when the drilling depth was constant,the higher the circulating medium flow rate,the stronger the heat exchange capacity of the casing buried tube heat exchanger.The circulating medium flow rate increased from 0.2 m/s to 0.7 m/s,the maximum heat extraction and rejection flow rate increased by 45%,and the minimum heat extraction and rejection flow rate increased only by 12%to 15%.At the end of heat extraction and rejection,the accumulation of cold and heat in the soil reached the ma

关 键 词：套管式地埋管换热器 换热能力 循环介质流速 钻孔深度 

分 类 号：TU833.3[建筑科学—供热、供燃气、通风及空调工程]