搭建地源热泵地埋管周围土壤热湿传递的试验台,对初始含水率、防水层、保温层以及相变回填材料等因素对土壤热量和水分传递的影响进行探究。沙箱实验结果表明：竖直埋管的热量会引起周围土壤的温度传递和水分迁移,土壤初始含水率的提高有利于温度恢复和地埋管换热,系统运行期间的温度峰值随初始含水率的增加而降低,防水层、保温层和相变回填材料也会对温度峰值和温度恢复产生影响。温度梯度和水力梯度是引起水分迁移的主要因素,在15%初始含水率时,温度梯度占据主导,驱动水分沿径向向远处扩散;在25%初始含水率时,水力梯度占据主导,水分沿深度向下渗透。
Abstract
The test platform of soil heat and humidity transfer around ground source heat pump buried pipe was built. The influences of initial water content, waterproof layer, insulation layer and phase change backfill on soil heat and humidity transfer were investigated. Sandbox experiment results show that the heat of vertical buried pipe will cause the heat and humidity transfer of the surrounding soil. The increase of soil initial water content is beneficial to temperature recovery and heat transfer. The peak temperature during system operation decreases with the increase of initial water content. Waterproof layer, insulation layer and phase change backfill materials also have an impact on the temperature peak and temperature recovery. Temperature gradient and hydraulic gradient are the main factors causing water migration. At an initial moisture content of 15%, the temperature gradient dominates, driving the water radially out far away. At the initial moisture content of 25%, the hydraulic gradient dominates, causing water permeates down the depth.
关键词
地源热泵 /
土壤温度 /
土壤湿度 /
相变材料
Key words
ground source heat pump /
soil temperature /
soil humidity /
phase change material
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基金
近零能耗建筑围护结构技术研究与示范（202203f07020001）; 复合能耦合互补空气源热泵控制系统关键技术研究与产业化（202103a05020037）
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