Analysis On The Running Performance Of Ground Source Heat Pump System And Its HGSHPS Based On Cooling Tower

Nowadays,there are more and more calls for the development of renewable energy in the world.As one of the important technological means to develop renewable energy,the technology of soil source heat pump has attracted much attention.China has vast land,different soil structure and climate,and is divided into five climatic zones.It is of great significance to study the operation performance of soil source heat pump system in different regions.By exploring the changes of soil temperature after years of operation of the soil source heat pump system,we can judge whether it is necessary to add auxiliary heat source or cold source to the soil source heat pump system.In view of the adaptability of the soil source heat pump system and the faith that the total annual heat absorption and total heat discharge of the soil source heat pump system should be balanced,this paper mainly adopts the modular dynamic system simulation software TRNSYS to analyze the performance of the soil source heat pump system and the compound soil source heat pump system(HGSHPS).To explore and find the relationship between the physical quantities and variables in the system,and to find the parameter setting relationship of the factors that influence the system when the system is in efficient operation mode.The model of soil source heat pump system was established by TRNSYS software.Then according to the parameters provided by the GSW120 model heat pump,the relative error between the predicted value and the parameter value provided by the product sample under the different load conditions is calculated by the EES software.And the accuracy of the soil source heat pump system established by TRNSYS software is verified.The energy consumption model of office buildings was established by De ST software,and the annual load characteristics of the office building were simulated.Then complete the design of the parameters of the ground source heat pump system for the office building,and input the determined parameter values into the TRNSYS software.The simulated locations of the office building of the ground source heat pump system are Harbin,Beijing and Wuhan.The change of soil temperature with years was simulated and analyzed.The variation of the peak water outlet temperature of buried pipe in the system with years was simulated and analyzed.In view of Wuhan,a system model of HGSHPS based on cooling tower is established.The simulation system runs continuously for 20 years.The changes of soil temperature,ASPF(Performance evaluation coefficient of the system for the whole year),heat pump unit power consumption and system power consumption with time are analyzed when the cooling tower bears different load ratios.When the cooling tower assumes a load ratio of 90%,the total power consumption of the heat pump unit is the minimum.When the cooling tower assumes a load ratio of 50%,the total power consumption of the composite system is the smallest,and the operating efficiency of the system is the highest.At this time,the mean value of ASPF is 3.066.Based on the HGSHPS model of cooling tower,the changes of soil temperature during the continuous operation of the system under different control modes for 20 years were discussed.Energy consumption analysis,optimization analysis and economic analysis are carried out for the system running under different operating conditions.The conclusion obtained from the analysis of this paper will be of reference significance to the rational design and energy consumption prediction of soil source heat pump system...