冷负荷占优型建筑地源热泵复合系统分析及策略优化  

Analysis and strategy optimization of ground source heat pump compound system in buildings with dominant cooling load

作　　者：孙文峰 姚海清 刘霞 张文科 李文静 孙知晓 SUN Wen-feng;YAO Hai-qing;LIU Xia;ZHANG Wen-ke;LI Wen-jing;SUN Zhi-xiao

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东中瑞新能源科技有限公司,山东济南250101

出　　处：《节能》2022年第12期20-24,共5页Energy Conservation

基　　金：山东省博士后创新项目“北方农村地区太阳能-空气能复合供能系统关键技术的研究”(项目编号:201903056)。

摘　　要：冷负荷占优型建筑中长期运行地源热泵会导致土壤温度升高,影响机组性能。提出时间控制和温差控制两种策略,利用TRNSYS仿真平台构建地源-风冷冷水机组、地源-冷却塔系统,分析两种控制策略在复合系统上均衡土壤温度的效果和性能参数,对比两种复合热泵系统的初投资和运行成本;针对地源-风冷冷水机组的容量和控制策略进行优化。结果表明:与温差控制策略相比,时间控制策略均衡土壤温度的效果更好,但运行成本偏高;干球温差控制和湿球温差控制的最佳温差限值均为2℃;时间控制策略下,采用风冷机组辅助散热的复合系统机组平均制冷系数(COP)波动幅度为23.89%,优化后的地源-风冷冷水机组复合热泵系统的费用年值较优化前最大可降低1.24万元。In buildings with a dominant cooling load, if the ground source heat pump is operated for a long period of time, it can lead to an increase in soil temperature and reduce the performance of the unit. The paper proposes two strategies, time control and temperature difference control, and uses the TRNSYS simulation platform to construct a ground-source-air-cooled chiller unit system and a ground source-cooling tower system, to analyse the effect and performance parameters of the two control strategies in equalising the soil temperature on the composite system, to compare the initial investment and operating costs of the two composite heat pump systems. The power and control strategy of the ground source-air-cooled water unit is optimised. The results show that the time control strategy is more effective than the temperature difference control strategy in equalising the soil temperature, but the operating cost is high.The optimal temperature difference limit for both the dry bulb temperature control and wet bulb temperature control is 2 ℃. The average coefficient of performance(COP) fluctuation of the composite system with air-cooled unit assisted heat dissipation under the time control strategy is 23.89%. The maximum reduction in annual cost of the ground-source-aircooled chiller compound heat pump system is 12 400 RMB compared to that before the optimisation.

关 键 词：土壤热平衡 地源热泵 地源-风冷冷水机组 地源-冷却塔系统 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]