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地埋管换热影响岩土体传热因素及热影响范围分析
引用本文:胡彩萍. 地埋管换热影响岩土体传热因素及热影响范围分析[J]. 山东国土资源, 2017, 33(8)
作者姓名:胡彩萍
作者单位:山东省第一地质矿产勘查院
摘    要:
该文介绍了地埋管换热器传热模型,对影响地下岩土体传热的地埋管换热功率、持续时间、热泵机组运行的方式与模式、换热器规格、管外回填材料以及地质-水文地质条件等因素进行了探讨,认为周围岩土体热响应范围大小与换热功率大小和持续时间长短、管外回填材料和周围岩土体导热性能高低呈正相关性,热泵机组间歇运行方式有利于地温场的及时恢复,冬季制热夏季制冷模式能削弱单一负荷聚集产生的热影响程度,同等能条件下双U型De32地埋管较单U型De25地埋管热影响范围要大。由于地埋管换热器吸热或放热不平衡而引起的冷热量累积效应,渗流速度越大,热影响范围则越大。济南东部碎屑岩区某模拟夏季工况试验表明,其他条件相同的前提下,8 k W换热功率持续运行,以换热孔为中心,岩体温度响应速率和影响幅度与径向距离成负相关性,距离越近,响应速率和影响幅度越大,反之就越小;47天后,地埋管换热器热影响范围大于5m。

关 键 词:浅层地热能;地埋管;热影响范围;热响应速率;影响因素

Analysis on Heat Transfer Factors and Thermal Influence Range of Rock and Soil Influenced by Heat Rransfer in Underground Pipe
HU Caiping. Analysis on Heat Transfer Factors and Thermal Influence Range of Rock and Soil Influenced by Heat Rransfer in Underground Pipe[J]. SHANDONG LAND AND RESOURCES, 2017, 33(8)
Authors:HU Caiping
Abstract:
In this paper, heat transfer model of buried pipe heat exchanger system has been introduced. Heat transfer power and the duration of the buried pipe, the mode of operation of heat pump unit, the specification of the heat exchanger, the external backfill material and geological and hydrogeological conditions, the heat transfer of underground rock mass have been studied. It is regarded that the range of thermal conductivity in the surrounding rock masses is positively correlated with the level of heat exchanger power, the length of the duration of thermal conductivity, the material of the external backfill and the heat conduction performance of the surrounding rock masses. The intermittent operation of heat pump unit is beneficial to the timely restoration of geothermal field. Winter heating and summer cooling mode can weaken the thermal influence of single load aggregation. The thermal influence of the double U-type De32 buried pipe is larger than of the single U-type De25 buried pipe under the same energy condition. The seepage action of groundwater is conducive to weaken or eliminate the cumulative effect of heat which is caused by the disequilibrium of the absorption or desorption of heat of the buried pipe exchanger. With stronger seepage action of groundwater comes lager range of thermal impact. A simulated summer working condition tests that the 8w heat transfer power is continuously running under the same condition as other conditions in the clastic rock area of eastern Jinan. It is showed that with the center of heat transfer hole, the temperature response rate and influence amplitude of rock mass are negatively correlated with radial distance, the nearer the distance, the greater the response rate and the impact amplitude, the less the converse will be, the more the thermal impact range of the buried pipe heat exchanger is greater than 5m in 47days.
Keywords:Shallow geothermal energy   buried pipe   thermal influence range   thermal response rate   influencing factors
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