Dynamic Simulation For The Vertical Buried Tubes’ Underground Heat Exchanging With Ground Source Heat Pump

With the continuous development of our economy, accelerating urbanization andthe rapid increase of building energy consumption, building energy conservation hasbecome a focus in the development of country’s economy.As an application of energyconservation and environmental protection technology,ground source heat pumptechnologyin our country gradually get attention and high-speed developing.As theprojects of ground source heat pump engineering technology application developingin our country continuously,some specific problems in the practical application hasalso been gradually put forward corresponsingly. There still has huge space ofapplication and optimization for ground source heat pump air-conditioningsystem.With actual projects,a lot of factors should be considered about thedesign,application and practical operation management of the system. If these factorscan be considered and analyzed comprehensivly,it will play an important role in thedevelopment of ground source heat pump technology application.Firstly, the heat transfer in ground heat exchangers was analyzed.As the keyequipment of the underground coupling ground source heat pump system,therationality of the heat transfer model of the underground buried pipe heat exchanger isvery important for the calculation of system.Based on the ground source heat pumpburied tube heat exchangers, heat transfer analysis was conducted, and the result wasused to the analysis of the influence factors of heat transfer of ground heat exchangereffection.Secondly, this paper used the TRNSYS analysis software to calculatebuilding energy consumption dynamic hot and cold load. Then the vertical pipe buriedunderground heat transfer dynamic simulation model was set up by TRNSYSsoftware transient simulation platforms to achieve the running of the undergroucomndcoupling ground source heat pump system in vriable condition.And the model outputresults, system energy consumption、COP of the system、temperature of the soil andcooling tower heat dissipating capacity of each index were analyzed.Finally,according to the results of the analysis of energy consumption in combination with anengineering example, three kinds of commoly used air-conditioning system weredesigned and compared. Plan1: ground source heat pump+cooling towerair-conditioning system; Plan2: air-cooled heat pump air-conditioning system; Plan3:split type air-conditioning system. The year-round energy consumption of the systemoperation under different condition was obtained, and then by using the dynamic annual cost method and static investment payback period method,the ecnomics ofdifferent air-conditioning system schemes was analyzed，By the analysis, we can seethat the static investment payback period of Plan1is5.19years compared with Plan2and4.51years compared with Plan3.In this paper, the dynamic heat exchanging characteristics of the vertical buriedtubes used in projects were researched,which maked the operation of the system morerational，more effective and more energy-saving.So the development of the groundsource heat pump can be promoted in order to make the application of theair-conditioning system run more rationlaly,more effectively and more economicly.Then，better response to the national call of energy conservation and emissionsreduction and environmental protection will be obtained.