温室太阳能跨季节蓄热-土壤源热泵耦合供暖运行特性  

Operational characteristics of ground source heat pump coupled with seasonal solar thermal energy storage for greenhouse heating

作　　者：杨绪飞 李飞 孙东亮[1] 于长永 冉宇进 张伟 宇波[1] YANG Xufei;LI Fei;SUN Dongliang;YU Changyong;RAN Yujin;ZHANG Wei;YU Bo(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Hangyang Group Co.,Ltd,Hangzhou 310004,China;No.114 Geological Team,Guizhou Bureau of Geology and Mineral Exploration and Development,Zunyi 563000,China)

机构地区：[1]北京石油化工学院机械工程学院,北京102617 [2]杭氧集团股份有限公司,杭州310004 [3]贵州省地质矿产勘查开发局114地质大队,遵义563000

出　　处：《农业工程学报》2024年第19期186-196,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51936001,52106073);贵州省地质矿产勘查开发局地质科研资金资助项目(黔地矿科合[2022]11号);北京市教育委员会人才培养质量建设项目(22019821001)。

摘　　要：针对温室采用土壤源热泵供暖存在土壤热失衡明显、土壤温度和供暖能效逐年降低的问题,该研究在112 m^(2)玻璃温室建设了耦合太阳能跨季节蓄热的土壤源热泵供暖系统,通过两个供暖周期试验,对热泵机组的运行、土壤热失衡、太阳能跨季节蓄热以及太阳能直供-土壤源热泵耦合供暖的运行特性进行深入分析。结果表明,在土壤源热泵供暖结束后,工作井温度下降2.40~2.97℃、监测井土壤温度下降0.60~1.00℃,土壤热失衡问题突出;太阳能跨季节蓄热使得监测井土壤温度较初始地温上升约0.2℃,有效解决了土壤热失衡问题;耦合供暖时太阳能直供可承担11%的热负荷,使得温室供暖能效系数从上一年度的2.79提升至3.19,提高了14.3%,节能效果明显。该研究揭示了供暖系统全年度和典型工况下的运行特性,实证了耦合太阳能解决土壤源热泵热失衡问题的可行性和高效性,并给出了系统高效运行主要操作参数的推荐值,为温室供暖相关研究与工程应用提供案例参考和数据支撑。As the world progresses towards achieving carbon neutrality,there is an urgent need to explore renewable energy sources,such as solar and geothermal energy,for greenhouse heating.Integrating these energy sources not only reduces greenhouse gas emissions but also ensures reliable and efficient heating,which is essential for maintaining optimal growing conditions in greenhouses.This study specifically focuses on the challenges associated with ground source heat pump(GSHP)systems,which have gained widespread attention for their stability when operating under low ambient temperatures.However,a well-documented issue with GSHP systems is the thermal imbalance in the soil,where prolonged use causes the ground temperature to drop,thereby reducing the system's efficiency over time.To address this issue,this study explores the operational characteristics of coupling seasonal solar thermal energy storage(SSTES)and solar thermal energy direct heating(STEDH)with the GSHP system.These methods aim to mitigate thermal imbalance and enhance the overall performance of the heating system.An experimental platform was constructed in northern China to facilitate this investigation,consisting of a 112 m²Venlo-style glass greenhouse heated by a GSHP system integrated with solar energy.Over two heating seasons,the study conducted a series of experiments to compare the performance of the GSHP system with and without the integration of SSTES and STEDH.During the first heating season,which spanned from January 1st to March 15th,the GSHP system operated independently without SSTES.The results showed significant diurnal fluctuations in the greenhouse heat load,leading to intermittent operation of the GSHP system.This caused the soil temperature in the boreholes of the GSHP working wells to exhibit daily cyclical fluctuations,with a local temperature drop of up to 2.5℃during heat extraction.The rate of soil temperature recovery was approximately 1.8 times faster than the rate of temperature decline,indicating a good daily thermal balance se

关 键 词：温室 清洁供暖 太阳能跨季节蓄热 土壤源热泵 热失衡 运行特性 

分 类 号：TK6[动力工程及工程热物理—生物能]