基于TRNSYS的地埋管地源热泵系统土壤冷热平衡研究  

Soil Heat Balance of Ground Source Heat Pump System Based on TRNSYS

作　　者：杜赛赛 王新如 张勇[1] 刘轩 陈伟[1] 李超[3] 潘嵩[4] DU Sai-sai;WANG Xin-ru;ZHANG Yong;LIU Xuan;CHEN Wei;LI Chao;PAN Song(PowerChina Northwest Engineering Corporation Limited,Xian 710065,Shaanxi,China;College of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China;College of Municipal and Environmental Engineering,Jilin Jianzhu University,Changchun 130118,China;Beijing Key Laboratory of Green Building Environment and Energy Saving Technology,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]天津商业大学机械工程学院,天津300134 [3]吉林建筑大学市政与环境工程学院,长春130118 [4]北京工业大学绿色建筑环境与节能技术北京市重点实验室,北京100124

出　　处：《建筑节能（中英文）》2022年第12期119-125,共7页Building Energy Efficiency

摘　　要：地源热泵系统常因供热、供冷季节对土壤的取放热量不一致,从而出现土壤热失衡的问题,使得系统性能衰减。为解决这一问题,基于瞬时模拟软件TRNSYS,搭建西安市常宁新区某基地研发中心模型,对其地源热泵系统10年间运行情况进行模拟仿真。同时以现有模型为基础,通过改变系统的设计参数包含地埋管深度、地埋管间距以及地埋管管径,分析西安地区地埋管土壤储、放热规律,评价系统生命周期内土壤热平衡性及系统性能系数(COP)的变化趋势。结果表明:地埋管深度越深,土壤温度变化越小。地埋管间距和管径一定时,当地埋管深度为80 m时,土壤10年温度增长为0.7℃;而当地埋管深度为140 m时,土壤10年温度增长仅为0.19℃。地埋管深度和管间距一定时,管径对系统COP和土壤温度的影响不大。地埋管间距越大,对于土壤温度影响越小,系统运行效果越好。当地埋管深度和管径一定时,对于文中提到的实际工程,当管间距缩小50%为2.25 m时,土壤温度相比较于初始温度增加0.798℃,而当管间距扩大1倍为9 m时,土壤温度近似保持不变,即扩大管间距可以有效避免热堆积现象的发生。期望为地源热泵系统更好地应用于工程中提供支持。Ground-source heat pump systems often have inconsistent heat extraction and release from the soil during the heating and cooling seasons,resulting in soil thermal imbalance and degrading system performance.In order to solve this problem,based on the instantaneous simulation software TRNSYS,a model of a base R&D center in Changning New District of Xi’an was built to simulate the operation of its ground-source heat pump system for ten years.At the same time,based on the existing model,by changing the design parameters of the system,including the depth of the buried pipe,the spacing of the buried pipe,and the diameter of the buried pipe,the law of soil storage and heat release of the buried pipe in winter and summer in Xi’an area is analyzed,and the life of the system is evaluated.The change trend of soil heat balance and system coefficient of performance(COP)during the cycle.The results show that the deeper the buried pipe,the smaller the change in soil temperature.When the distance and diameter of the buried pipes are fixed,when the depth of the buried pipe is 80 m,the soil temperature will increase by 0.7℃in ten years;when the depth of the buried pipe is 140 m,the soil temperature will increase by only 0.19℃in 10 years.When the buried pipe depth and pipe spacing are fixed,the pipe diameter has a little effect on the system COP and soil temperature.The larger the distance between the buried pipes,the smaller the impact on the soil temperature and the better the system operation effect.The local buried pipe depth and pipe diameter are fixed.For the actual project mentioned,when the pipe spacing is reduced to 2.25 m,the soil temperature increases by 0.798℃compared to the initial temperature,and when the pipe spacing is doubled to 9m,the soil temperature is approximately unchanged,that is,expanding the pipe spacing can effectively avoid the occurrence of thermal accumulation.This research is expected to provide support for the better application of ground source heat pump systems in engineering.

关 键 词：地源热泵 TRNSYS 土壤热平衡 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]