太阳能Issue(5)：96-102,7.DOI:10.19911/j.1003-0417.tyn20240529.03
中深层同轴地埋管换热系统的换热性能研究
RESEARCH ON HEAT TRANSFER PERFORMANCE OF MIDDLE-DEEP COAXIAL BURIED PIPE HEAT EXCHANGE SYSTEM
摘要
Abstract
This paper takes the middle-deep coaxial buried pipe heat exchange system used in the Huanghua airport area of Changsha City as an example,introduces its structure,and analyzes the heat exchange performance of the system through on-site heat exchange testing.The analysis results show that:1)In the last 9 days of the test condition with a flow rate of 28 m3/h and an inlet temperature of 10℃for the circulating working fluid,the average heat transfer power of the medium deep coaxial buried tube heat exchange system is about 535 kW,and the corresponding outlet temperature of the circulating working fluid is 29℃.This indicates that the heat source of the medium deep coaxial buried tube heat exchange system is relatively stable and has good heat transfer capacity.2)When the inlet temperature of the circulating working fluid is constant,increasing the flow rate of the circulating working fluid will lead to a decrease in the outlet temperature of the circulating working fluid,but in the initial stage of increasing the flow rate of the circulating working fluid,the heat transfer power may increase due to the multiplier effect of the flow rate.However,as the flow rate further increases,the growth rate of heat transfer power slows down and eventually approaches the limit value of the formation's thermal conductivity.3)After the completion of condition 1 testing,after a 15 day interval,the formation temperature at 2500 m below the wellbore is close to 99%of the initial formation temperature at the wellbore.This indicates that the geothermal well has good heating capacity,which provides strong support for the long-term stable utilization of geothermal energy.关键词
黄花机场/地热能/中深层同轴地埋管换热系统/换热测试/换热性能Key words
Huanghua airport/geothermal energy/middle-deep coaxial buried pipe heat exchange system/heat exchange test/heat transfer performance分类
天文与地球科学引用本文复制引用
刘素平,粟琼玉,旷巍,伍唐怡杰..中深层同轴地埋管换热系统的换热性能研究[J].太阳能,2025,(5):96-102,7.基金项目
湖南省自然资源厅科研项目(HBZ20240150) （HBZ20240150）
湖南省地质院科研项目(HNGSTP2023,HNGSTP202437) （HNGSTP2023,HNGSTP202437）
