跨季节土壤蓄冷-土壤源热泵系统长期运行特性实验研究  

Experimental study on long-term operating characteristics of groundcoupled heat pump system with cross-seasonal soil cold storage

作　　者：杨家恒 吕超[1] 吴子龙 朱伟 Yang Jiaheng;Lv Chao;Wu Zilong;Zhu Wei(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学建筑工程学院,杭州310018

出　　处：《低温工程》2024年第1期81-87,96,共8页Cryogenics

基　　金：浙江省自然科学基金项目(LY18E060009)。

摘　　要：为解决土壤源热泵在长期运行条件下土壤热失衡导致的运行效率下降问题,针对夏热冬冷地区的特点,提出一种利用室外风机盘管将冬季或过渡季室外空气中的冷量存储于土壤中的跨季节蓄冷-土壤源热泵系统。利用地埋管换热系统的相似模型实验台,进行了系统运行3年的供冷、供暖、蓄冷工况实验,综合分析了埋管进出口水温、气温、土壤温度、土壤及埋管换热量、单位埋深换热量等参数,研究系统的长期运行特性。研究显示:3年的土壤平均温度分别上升0.14℃、0.22℃、0.20℃,总体来说升高幅度较小;蓄冷时的室外气温越低、土壤与室外空气的温差越大,蓄冷效果越好;埋管进出口平均温差、土壤平均温度变化、土壤换热量、埋管换热量、单位埋深换热量的大小关系一致。研究结果表明,跨季节蓄冷维持了土壤的长期热平衡,系统的长期运行效果较好。In order to solve the problem of operation efficiency decrease caused by soil heat imbalance under long-term operation conditions,a ground-coupled heat pump( GCHP) system with cross-seasonal soil cold storage was proposed,using the outdoor fan coil to store air cold into the soil in winter or transitional season in response to the characteristics of hot summer and cold winter zone.An experimental bench using a similar model method of the buried pipe heat exchange system was built,and the GCHP system has been operated and tested for three years under the conditions of cooling,heating and cold storage.The parameters such as the inlet and outlet water temperature of the buried pipe,air temperature,soil temperature,heat exchange of soil and buried pipe,and heat exchange rate per unit buried depth were comprehensively analyzed to study the long-term operating characteristics of the system.The results show that the average soil temperature of three years increased by 0.14 ℃,0.22 ℃ and 0.20 ℃,respectively,which were generally small,the lower the outdoor air temperature and the greater the temperature difference between soil and outdoor air,the better the effect of cold storage;the average temperature difference between the inlet and outlet of buried pipe,the average soil temperature change,the heat exchange of the soil,the heat exchange of the buried pipe and the heat exchange rate per unit buried depth were consistent.The research results indicate that cross-seasonal cold storage maintains the long-term heat balance of the soil,and the long-term operation effect of the system is good.

关 键 词：土壤源热泵 土壤蓄冷 长期实验 水温 土壤温度 

分 类 号：TB65[一般工业技术—制冷工程] TB663