摘要
为满足季节性冻土区路基冻胀应急抢险需求,设计1款路基专用直接膨胀式地源热泵供热装置,并通过连续运行供热和间歇运行供热试验研究装置的供热性能。结果表明:地源热泵供热装置最高供热温度可达90℃,最低吸热温度可达-15℃;间歇供热条件下,供热段平均供热温度随启停时间比的增大而升高,吸热段平均吸热温度随启停时间比的增大呈先降后升的规律;土体传热效率随着时间延长和与热泵距离的增大而降低,热泵运行第1天的热作用半径为0.87 m;热泵制热系数随启停时间比的减小而增大,最高达3.0以上,启停时间比过高时热泵能效性和地热能收集效果较差,而启停时间比过低时供热防冻效果较差。针对单线铁路路基冻害快速抢险需求,建议装置供热功率定为1.0~2.0 kW,布设间距取1.5~3.0 m,启停时间比先设为2 h∶1 h,然后根据冻胀缓解程度逐步降低启停时间比。
In order to meet the emergency rescue needs of subgrade frost heave in seasonally frozen soil regions,a special heating device was developed based on the direct-expansion ground-source heat pump.Both the continuous and intermittent operation heating tests were carried out to study its heating performance.The results show that the maximum heating temperature of the ground-source heat pump heating device can reach 90℃ and the minimum endothermic temperature is below-15℃.Under the condition of intermittent heating,the average heating temperature in heating section increases with the increase of start-stop time ratio,and the average endothermic temperature of the endothermic section decreases first and then increases with the increase of start-stop time ratio.The heat transfer efficiency of soil decreases with the increase of time and distance from the heat pump,and the thermal influencing radius is 0.87 m on the first day of operation.The heating coefficient of heat pump can reach above 3.0,and it increases with the decrease of start-stop time ratio.When the start-stop time ratio is too high,the energy efficiency and geothermal energy collection effect of heat pump are poor,while when the start-stop time ratio is too low,the heating anti-freezing effect is poor.In view of the quick rescue needs of frost damage for single-track railway subgrade,it is suggested that the heat supply capacity of the device should be designed as 1.0 kW-2.0 kW,the layout spacing should be 1.5 m-3.0 m.The startstop time ratio should be set as 2 h:1 h at first,and then the ratio should be gradually reduced according to the mitigation degree of frost heave.
作者
胡田飞
岳祖润
闫晓夏
徐丽霞
HU Tianfei;YUE Zurun;YAN Xiaoxia;XU Lixia(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;Shenzhen Research and Design Institute,China Academy of Railway Sciences Corporation Limited,Shenzhen Guangdong 518034,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2021年第6期39-49,共11页
China Railway Science
基金
国家自然科学基金资助项目(42001059,41731281)
河北省自然科学基金资助项目(E2020210044)
河北省高等学校科学技术研究项目(QN2020180)。
关键词
路基
季节性冻土区
地源热泵
启停时间比
换热温度
制热系数
热作用半径
Subgrade
Seasonally frozen soil region
Ground-source heat pump
Start-stop time ratio
Heat exchange temperature
Heating coefficient
Thermal influencing radius
