该文以实际工程为背景,开展埋深为120 m单U型与345 m一进两出型地埋管换热器的现场岩土热响应与热恢复试验研究。分析不同管材及埋管类型地埋管换热器传热效率。结果表明,管材对换热效率影响较大,一进两出型换热器进孔钢管换热量占总换热量的71.4%。相较于120 m单U型地埋管换热器,345 m一进两出型地埋管换热器在冬季供暖工况下,每延米换热量平均提高24%,在夏季制冷工况下,由于初始平均地温较高,每延米换热量略有下降。
Abstract
In this paper, practical engineering as the background, in situ thermal response and thermal recovery tests were conducted on 120 m single U-shaped and 345 m one-inlet two-outlet borehole heat exchangers, respectively. Then the heat transfer efficiency of borehole heat exchangers with different pipe materials, tube types and burial depths was analyzed. The results show that the pipe material significantly impacted on heat transfer efficiency, and the heat exchange of the inlet steel pipe of the one-inlet and two-outlet heat exchanger accounts for 71.4% of the total heat exchange. Compared to the 120 m single U-shaped borehole heat exchanger, the 345 m one-inlet and two outlet has an average increase of 24% in heat exchange per linear meter under winter heating conditions. Due to the higher initial average ground temperature, the heat transfer per linear meter slightly decreased under summer cooling conditions.
关键词
地热能 /
地源热泵 /
换热器 /
热响应试验 /
热恢复试验
Key words
geothermal energy /
ground source heat pump /
heat exchanger /
thermal response test /
thermal recovery test
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基金
宁夏自然科学基金（2022AAC03699）
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