The Study On Gshp System’s Application In Construction In Exetreme Cold Area

Ground Source Heat Pump air conditioning system is environment friendly technology.It has been widely used in China as it’s significant energy saving.However,in some part of north China where clime is extreme cold,the cooling and heating load is imbalanced.This will result in that the caloric taken by pump from soil can not be plenty given back after a run period of one year and soil temperature will have incessancy decline.This will result to cold-cumuli.And after several period,there’s no more caloric to be used.During the research,we surveyed the thermodynamics characteristics.Based on this,the heat exchange mathematical model of GSHP system was established. By the mathematical simulation,the research simulated the thermogram of soil and it’s transformation rule where the U-tube was fixed with equally distance. Meshing of three-dimensional geometric model based on the principle that he temperature field and velocity field where changed severely with space meshed densely,and where changed slowly meshed loosely. At the same time, choosed "k- epsilon eqn(2)" model as the calculation of turbulent model, and decided the thickness of boundary layer of tube wall. Ultimately defined boundary conditions and used FLUENT solving setting the solver,and obtained three-dimensional vertical double u-Tube ground heat exchanger heat transfer model.Used double U-tube model to simulate soil temperature field changes of U-tube ground heat exchanger in continuous operation and intermittent operation condition, and it was concluded that underground soil temperature change trend of the soil source heat pump in the continuous operation and intermittent operation. The soil source heat pump in winter operation condition monitoring data were analyzed in detail. In addition, made some necessary analysis about monitoring data of the soil source heat pump running condition in summer, and compared it with winter data and found that serious hidden dangers of soil cold accumulation. Discussed the variations of soil temperature field of tube groups in winter heating condition, outagestate and summer frigeration condition. Soil temperature fell sharply in winter heating condition and had some rebounded in outage state and summer frigeration condition.To solve soil cold accumulation problem of soil source heat pump, put forward four ways to alleviate contradictions.