冷热负荷不平衡地区地热换热器设计及其运行对策  

Design and Operation of Borehole Heat Exchangers in Unbalanced Heating and Cooling Load Area

作　　者：郭敏[1,2] 刁乃仁[1,2] 朱科[1,2] 方肇洪[1] GUO Min;DIAO Nairen;ZHU Ke;FANG Zhaohong(School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101,China;Key Laboratory of Renewable Energy Utilization Technology in Building , Ministry of Education, Jinan 250101, China)

机构地区：[1]山东建筑大学热能工程学院,济南250101 [2]可再生能源建筑利用技术省部共建教育部重点实验室,济南250101

出　　处：《北京工业大学学报》2019年第1期88-94,共7页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51176104);国家重点研发计划资助项目(2016YFC0700803-01)

摘　　要：为提高冷热负荷不平衡地区使用地源热泵系统后地下温度场的均匀性,以36个钻孔组成的地埋管管群,冷热负荷比为2. 5∶1. 0,运行期20年为例,提出了3种外密内疏的分区优化埋管布置方式.仿真结果表明:地埋管中心区域布管数量相对稀疏,有利于减小温度场的温度梯度,提高温度场的均匀性,边界区域过余温度相比传统的均匀布管方式略有提高,能有效降低中心区域温度场的波峰现象,此外,土壤热扩散系数越小,采用中间布管稀疏、外围布管紧密的优化设计方案的效果愈加明显,验证了外密内疏管群优化布置方案的可行性.To improve the uniformity of underground temperature after using ground source heat pump system, three optimal layouts of 36-borehole heat exchangers (BHE) were proposed for area with an unbalanced cooling/ heating load ratio of 2.5:1.0 and an operation duration of 20 years. Results show that the less the BHEs are located in the center of drilling area, the more uniform the temperature field with the less temperature gradient will be. The surrounding underground excess temperatures of the optimal layouts are slightly higher than that of the traditional layout and the peak values of the temperature field can be reduced. Additionally, the effect is more significant when applied to the area with small thermal diffusivity. The feasibility of the proposed optimal BHE layout are verified.

关 键 词：地埋管换热器 优化布置 有限长线热源 叠加原理 热平衡 

分 类 号：TK52[动力工程及工程热物理—热能工程]