Study Of Multi-source Heat Pump Systems In Hot Summer And Warm Winter Area

Ground-source heat pumps have been widely used due to the advantages of energy saving,environment protection and stable running.But the respective defects of single source heat pumps also have been reflected in practical applications.Thus,nowadays,the studies of multi-source heat pump systems increases gradually.This article studies the operating performance,thermal contribution rates and the effect on the soil temperature field of tow multi-source heat pump systems in hot summer and warm winter area.The major researches are as follows:(1)This article studies the operating performance of direct-expansion solar source?ground-source and multi-source working condition of a direct-expansion solar-ground source heat pump system in different seasons,and analyses the heat collection capacity of direct expansion solar system.Thus puts forward a reasonable operation scheme throughout the year.(2)Analyses of the solar thermal contribution rate and soil thermal contribution rate of the system under different conditions in three seasons are given,and the annual thermal contributions of two sources are also been calculated.Results show that when the system is running in reasonable operation conditions,the heat absorbed from soil can reduce 4.48xl05MJ,and the annual thermal contribution rate of solar evaporators can be 46.4%.(3)This article studies the operating performance of a cooling tower-ground source heat pump air conditioning-hot water system in different seasons and analyses the effect of heat multi-level shunt of the system.The cold and hot imbalance rate of soil reduces from 33%to 14.1%,and the heat released to soil can reduce 1.15x106MJ.(4)Using TRNSYS software to set the simulation model of building hourly load and simulation model of the cooling tower-soil source heat pump air conditioning-hot water system,and analyses the effect on soil temperature field.