夏热冬冷地区土壤源热泵跨季节土壤蓄冷特性实验研究  

Experimental study on cross-seasonal soil cold storage characteristics of ground-coupled heat pump in hot summer and cold winter zone

作　　者：吴子龙 吕超[1] 朱伟 Wu Zilong;Lv Chao;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》2023年第2期70-77,共8页Cryogenics

基　　金：浙江省自然科学基金项目(LY18E060009)。

摘　　要：为解决夏热冬冷地区土壤源热泵系统的土壤热失衡问题、提高系统运行效率,提出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土壤蓄冷方法。搭建了地埋管换热系统的相似模型实验台,进行了土壤源热泵系统的供冷、供暖、蓄冷实验,并将系统中的地埋管分成两组,在供暖后期同时运行供暖和蓄冷工况,研究跨季节土壤蓄冷的运行效果。研究显示:在全年周期实验中,有蓄冷实验和无蓄冷实验的土壤平均温度分别上升0.25℃和0.99℃;经过供暖工况和蓄冷工况,无分组蓄冷实验和有分组蓄冷实验的土壤平均温度分别下降2.60℃和2.84℃。研究结果表明:跨季节土壤蓄冷可有效降低土壤温度,减小土壤源热泵系统全年运行后的土壤温升,缓解长期运行时的土壤热堆积问题,有利于夏季供冷工况的运行;在供暖后期进行土壤蓄冷,可在不影响供暖效果的同时,进一步降低土壤温度,提高蓄冷效率和蓄冷量。In order to solve the soil heat imbalance problem of ground-coupled heat pump(GCHP)system in hot summer and cold winter zone and to improve the system’s operating efficiency,a cross-seasonal soil cold storage method was proposed,using outdoor fan coil to store cold into the soil in winter or transitional season.A similar model experimental bench was built for a U-tube heat exchange system,and experiments on cooling,heating and cold storage of the GCHP system were carried out.The U-tubes in the system were divided into two groups,which can run the heating and cold storage conditions simultaneously in the later period of heating.And the operational effect of the cross-seasonal soil cold storage was studied.The study shows the average soil temperature with and without cold storage experiment increase by 0.25℃and 0.99℃respectively,during the year-round cycle experiment.After the heating and cold storage conditions,the average soil temperature without and with grouped cold storage experiment decreased by 2.60℃and 2.84℃,respectively.The results of the study show that cross-seasonal soil cold storage can reduce the soil temperature effectively and reduce the soil temperature rise after the year-round operation of the GCHP system,which alleviates the problem of soil heat build-up during long-term operation and facilitates the operation of cooling condition in summer.Soil cold storage in the later period of heating can further reduce the soil temperature and improve the cold storage efficiency and capacity without affecting the heating effect.

关 键 词：土壤源热泵 相似模型实验 跨季节土壤蓄冷 分组蓄冷 夏热冬冷地区 

分 类 号：TB663[一般工业技术—制冷工程]