摘要
地埋管地源热泵工程在发挥供暖、制冷等作用的同时,埋管区地层温度场也发生了复杂的结构性变化,陕西地区对地下岩土体温度场影响机制研究不够深入,对热泵工程可持续利用的调控带来困难。本文依托陕西省浅层地热能开发利用示范研究基地,分析地源热泵系统稳定运行2 a及疫情影响下停止运行1a地埋管换热区的温度监测数据,研究地埋管换热区地层温度的垂向深度及平面展布特征。结果显示:系统稳定运行2 a,换热区各区域地温在时间尺度上受地埋管换热器吸排热量的影响呈波状变化,并且相较于环境温度变化表现出不同的时滞性,距离换热器越远时滞性越强;在地埋管长度以内,随着深度增加,温度波动减小;在水平向,距离地埋管越远温度波动越小,单根换热器对地温的影响半径为3.2~3.9 m;系统稳定运行2 a地埋管换热器吸排热量基本平衡,未造成地质体冷热堆积,停止运行1 a,由于吸排热量不均衡造成了地质体存在冷堆积,调控运行热泵系统可使冷堆积现象消失。该文旨在系统地分析关中盆地地源热泵工程对地温场的影响机制特征,为地源热泵平稳运行提供基础数据支持,为区域地热资源的科学、长期开发提供理论依据。
While the ground source heat pump project with buried pipes plays a role in heating and cooling, the ground temperature field in the buried pipe area has also undergone complex structural changes. The research on the influence mechanism of underground rock and soil temperature field in Shaanxi is not deep enough, which brings difficulties to the regulation of sustainable utilization of heat pump projects.Based on the Demonstration Research base of shallow geothermal energy development and utilization in Shaanxi Province, this paper analyzes the temperature monitoring data of the geothermal heat transfer area where the ground source heat pump system is in stable operation 2 a and the buried pipe is out of operation 1 a under the influence of the epidemic, and studies the vertical depth and plane distribution characteristics of the stratum temperature in the buried pipe heat transfer area.The results show that the system runs stably for 2 a, and the ground temperature in each area of the heat exchange area shows wave-like changes in the time scale under the influence of the heat absorption and discharge of the buried pipe heat exchanger, and shows different time delays compared with the environmental temperature changes. The longer the distance from the heat exchanger, the stronger the delay. Within the length of the buried pipe, the temperature fluctuation decreases with the increase of depth.In the horizontal direction, the farther away from the buried pipe, the smaller the temperature fluctuation, and the radius of influence of a single heat exchanger on the ground temperature is 3.2~3.9 m. The system runs stably 2 a, the heat absorption and discharge of the buried pipe heat exchanger is basically balanced, no hot and cold accumulation of the geological body is caused.The operation of 1 a is stopped. The cold accumulation of the geological body is caused by the imbalance of heat absorption and discharge, and the cold accumulation phenomenon can be eliminated by regulating the operation of the heat pump system.Th
作者
梁欣阳
赵雪红
王青
LIANG Xin-yang;ZHAO Xue-hong;WANG Qing(Shaanxi Weihe Ecological Area Protection Center,Xi'an 710004,Shaanxi,China;Aerospace Star Space Technolo-Application Co.,Ltd.,Xi'an,Shaanxi 710000,China)
出处
《地下水》
2022年第6期11-16,共6页
Ground water
基金
陕西省公益性地质调查项目:“关中平原城市群浅层地温能开发利用潜力评价及环境效应研究”(201915)。
关键词
地源热泵
地埋管
地温场
变化幅度
Ground-source heat pump
Buried pipe
Ground temperature field
Variation range
