摘要
地源热泵运行中地埋管换热器与岩土层的热交换必然引起地埋管周围温度场的变化。借助岩溶地区地源热泵系统实验平台,开展夏季制冷工况下两种不同运行模式的实验,探讨地埋管周围温度场的变化规律及其对地源热泵性能的影响。实验研究结果表明:1横、竖地埋管管壁温度的变化规律基本上一致,但其管壁温升幅度有所差异,竖埋管管壁的温升幅度(间歇工况3.7℃,连续工况3.2℃)均较横埋管(间歇工况0.9℃,连续工况0.7℃)要大;2横、竖地埋管周围土壤温升幅度跟距离地埋管的远近有关,随着距离的增加,其温升的幅度递减;31.0 m以上地层土壤温度变化受气候环境变化的影响,从而影响了埋深较浅的横埋管。而埋深较大的竖埋管受岩溶地下水渗流的影响;4系统回水温度对热泵机组性能系数COP有显著影响,间歇运行模式下的热泵机组性能系数COP对系统回水温度的变化更加敏感。
Heat exchange between ground heat exchanger （ GHE） and its surrounding soil occurs when ground source heat pump （ GSHP ） is running ’ which will inevitably lead to the change of temperature field around the buried pipe of GHE. Experiments on two different cooling operation karst area , for exploring the variation of temperature field around the buried pipe and its influence on the performance of GSHP. The experimental results show that the change pattern of wall temperature of horizontal and vertical buried pipes is roughly the sam e, but the wall temperature rises at different va ue s, and the wall temperature of vertically buried pipe rises （ Intermittent working condition 3. 7℃ ,Continuous working condition 3. 2 ℃ ）higher than that of the horizontally buried pipe （Intermittent working condition 0. 9 ℃ ,Continuous working condition 0. 7 ℃ ） ;that the temperature of soil is related to the distance from the soil to the buried pipes, namely the temperature de clines with the increase of the distance; that the temperature change of stratum soil above 1. 0m is affected by the environment, which affects the shallowly buried pipe, and the vertically and deeply buried pipe is influenced by karst groundwater seepage; that the temperature of return water of the system has obvious influence on the coefficient of performance （ COP） of the heat pumpunit, and the COP of the heat pumpismore sensitive to the temperature change of return water in the intermittent operation mode
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2017年第1期260-267,共8页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(41502284
51568014)
广西自然科学基金资助项目(2013GXNSFBA019233)
广西建筑新能源与节能重点实验室资助课题(桂科能15-J-21-1)
国土资源部岩溶生态系统与石漠化治理重点实验室资助项目(KDL201603)
关键词
地源热泵
岩溶地区
地埋管
温度场
性能系数
ground source heat pump（GSHP）
karst region
ground heat exchanger（GHE）
temperature field
coefficient of performance （COP）
