太阳能辅助地源热泵联合供暖系统模拟研究

Numerical study on the combined heating system of a ground-source heat pump assisted by the solar energy

为了改善寒冷季节建筑物供暖能耗偏高的问题,利用太阳能光伏光热系统辅助地源热泵(PV/T-GSHP)进行联合供暖。以北京市某民用节能建筑为研究对象,利用瞬时系统模拟程序TRNSYS对PV/T-GSHP系统在供暖季(2018-11—2019-03)的应用进行了模拟分析。针对当地气象参数和系统设备性能指标,建立了4种不同的温度调控策略,并与传统的地源热泵系统(GSHP)模拟结果进行对比。研究结果表明:PV/T系统的光电、光热转换效率分别达到了15.0%和46.6%;与GSHP系统相比,PV/T-GSHP系统的性能系数和整体性能系数平均提升了6.9%和10.3%;通过10 a的长期运行模拟,PV/T-GSHP系统的土壤温度降幅仅为8.0%。

In order to solve the high energy consumption of buildings in cold season,a ground-source heat pump assisted by the solar photovoltaic/thermal system(PV/T-GSHP)can be used.A civil building in Beijing was taken as the research object.The transient system simulation code TRNSYS was adopted to analyze the PV/T-GSHP system performance during heating season(November 2018 to March 2019).Four different temperature control strategies were established based on the local climatic conditions and performance parameters of system equipments.The numerical results were also compared with those of the traditional ground-source heat pump(GSHP)system.The results indicate that the photoelectric and photothermal conversion efficiencies of the PV/T system reach 15.0%and 46.6%,respectively.Compared with the tradional GSHP system,the coefficient of performance and the overall coefficient of performance of the system are increased by 6.9%and 10.3%,respectively.The soil temperature drop of the PV/T-GSHP system is only 8.0%according to a long-term simulation of 10 years.