喷气增焓空气源耦合地源热泵系统的性能优化

Performance Optimization of Jet-Enhanced Air Source Coupling Ground Source Heat Pump System

针对山西省太原地区地源热泵应用导致土壤热平衡难以满足的问题,在传统空气源耦合地源热泵系统的基础上,设计一套新的喷气增焓空气源耦合地源热泵系统,并建立相关的数学模型.以太原地区某一建筑的应用为例,利用DeST软件模拟计算案例建筑全年冷、热负荷需求特征,利用TRNSYS软件仿真分析常规地源热泵、空气源热泵、喷气增焓空气源耦合地源热泵系统的性能,并对新的喷气增焓空气源耦合地源热泵系统性能进行优化.结果表明:案例建筑全年累计冷、热负荷比为1.57∶1.00,应用常规地源热泵后,土壤初始温度和最高温度逐年下降,10 a后平均温度降幅14.3%;与常规地源热泵系统比较,喷气增焓空气源耦合地源热泵系统初投资节省12.5%,节省25.8%的打井数,节省33.9%的运行费和15.9%的总费用,可解决埋管区土壤冷、热不平衡、埋管面积不足的问题,夏季性能系数(COP)提升26.2%,冬季制热性能系数(COP h)提升12.3%.

Aim at the problem of soil heat balance in the application of ground source heat pump in Taiyuan area,Shanxi Province,a new jet-enhanced air source coupling ground source heat pump system was designed based on traditional air source coupling ground source heat pump system,and its related mathematical model was established.Taking the application of a certain building in Taiyuan area as an example,DeST software was used to simulate and calculate the annual heating and cooling load demand characteristics of the case construction.The performance of conventional ground source heat pump,air source heat pump and new dual-source coupling system was simulated by TRNSYS software.Finally,the performance of the dual-source coupling heat pump system was optimized.The result shows that the cumulative heating and cooling load ratio of the case building is 1.57∶1.00.After the application of the conventional ground source heat pump,the initial temperature and maximum temperature of the soil decrease year by year,and average temperature decreases by 14.3%after 10 years.Compared with the conventional ground source heat pump system,the initial in vestment of the new dual-source coupling system saves 12.5%,the number of wells saves 25.8%,operating cost saves 33.9%,and total cost saves 15.9%.Therefore,the new system solves problem of unbalanced soil heating and cooling load and insufficient buried pipe area in the buried pipe area effectively.The summer performance coefficient(COP)increases by 26.2%,and the winter collection coefficient(COP h)increases by 12.3%.