用于冬季葡萄根系土壤增温的混合重力热管温度响应及热性能分析  

Analysis of temperature response and thermal performance of hybrid gravity heat pipes for winter soil warming of grapevine root systems

作　　者：邓改革 杨佳 马翔 康宁波[1] 何建国[1] 李建设 DENG Gaige;YANG Jia;MA Xiang;KANG Ningbo;HE Jianguo;LI Jianshe(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021

出　　处：《农业工程学报》2025年第1期230-237,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：宁夏自然科学基金项目(2022AAC03644)。

摘　　要：重力热管是一种高效的传热设备,在浅层地热能的开发方面具有巨大潜力。为提高冬季葡萄根系土壤的温度,该研究设计并测试了一种混合重力热管(hybrid gravity heat pipe,HGHP)。HGHP由铜和聚丙烯无规共聚物(polypropylene random,PPR)材料组成,其中铜用于蒸发段和冷凝段,PPR用于绝热段。通过大地试验研究比较了HGHP与传统铜重力热管(copper gravity heat pipe,CGHP)的热力学性能。结果显示,与对照组相比,CGHP和HGHP分别使土壤温度提高了4.94和3.08℃,增温效果显著;两种热管均表现出良好的等温特性。由于使用了低成本的PPR材料替代昂贵的铜材料,HGHP成本较CGHP降低48.39%,降幅明显。尽管HGHP的热传递性能略低于CGHP,其经济性和可行性使其在地热能开发中具有应用潜力。该研究为降低地热能开发成本提供了可行的解决方案,并为重力热管在农业领域的应用提供了理论依据和实践指导。A hybrid gravity heat pipe(HGHP)can greatly contribute to the soil warming of the grapevine root systems in cold agricultural regions in winter.According to the shallow geothermal energy,HGHP technology can provide an efficient yet economically feasible solution to sustain the root temperatures for plant growth during cold seasons.Among them,copper is used in the evaporative and condensative sections,while the polypropylene random copolymer(PPR)is in the adiabatic section,indicating a cost-efficient alternative to traditional all-copper heat pipes.This research aims to investigate the thermal response and performance of the HGHP.A series of tests were conducted in a vineyard region in Ningxia in northwest China.Particularly,the harsh winter temperatures shared a significant impact on grapevine productivity and survival.The efficacy of the HGHP was also evaluated on the soil temperatures at grapevine root zones.A comparison was then made on the thermal efficiency and economic benefits against the conventional copper gravity heat pipe(CGHP).The feasibility of HGHP was verified to evaluate the performance under varying environmental conditions.A stable thermal environment was also maintained on the grapevine growth.A field experiment was conducted at a vineyard in the Helan Mountain area of Ningxia,particularly with both HGHP and CGHP installed under similar conditions.Both systems shared the identical configuration,except for the materials in the adiabatic sections.Each evaporator of pipe was positioned in groundwater to absorb the heat.While the adiabatic sections were embedded in soil with insulative covering to minimize the external thermal influence.Temperature sensors were placed along each evaporative of heat pipe,adiabatic,and condensative sections,as well as in surrounding soil,in order to capture the temperature fluctuations.Observations were conducted across 121 days,thus covering the distinct meteorological conditions,including cloudy,snowy,extremely low-temperature,typical winter,and hightemperature sce

关 键 词：混合重力热管 铜重力热管 热力学性能 浅层地热能 

分 类 号：TK529[动力工程及工程热物理—热能工程]