| 地质条件及埋管形式对地埋管换热器换热性能影响研究 |
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| 关键词:shallow geothermal energy rock-soil thermal response test stratum temperature groundwater runoff heat exchanger type |
| 基金项目:北京市地质矿产勘查院综合地质调查与评价项目(编号: PXM2018_158203_000010; PXM2018_158309_000002; PXM2020_158309_000012) |
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| 摘要: |
| Study on the Influence of Geological Conditions and Heat Exchanger Type on BHE Thermal Performance |
| Based on the rock-soil thermal response test results of 35 in-situ heat exchange holes in Beijing, the influence of different geological conditions and heat exchanger type on the heat transfer capacity of borehole heat exchangers (BHEs) was analyzed. The results show that geological conditions significantly influence BHE thermal performance. When the stratum temperature changes by 1 ℃, the heat transfer capacity changes by ~8%. The thermal performance of bedrock stratum is 35% higher than that of loose stratum on average. The groundwater flow rate at the test hole increased from 0.14 m/d to 0.91 m/d and the Pe value increased from 18 to 113. Additionally, due to the strengthening of heat convection, the BHE thermal performance increased by 13%. Under the same geological conditions, the heat exchange per meter of coaxial BHE is 40% higher than that of double U BHE in winter. Furthermore, when the depth increased from 150 m to 300 m, the heat exchange per meter of double U and coaxial BHEs increased slightly. |
| LI Juan,ZHENG Jia,LEI Xiao-dong,JIA Zi-long,LIU Ai-hua,XU Zi-jun.2023.Study on the Influence of Geological Conditions and Heat Exchanger Type on BHE Thermal Performance[J].Acta Geoscientica Sinica,44(1):221-229. |
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