Simulation And Analysis Of Air-Soil Dual Source Heat Pump Operating Characteristics In Cold Regions

Energy density of ground source heat pump is relatively low.It needs to lay more underground pipe.It occupies a larger area.Initial investment is relatively high.Ground heat absorbs heat from soil in long-term.This makes that temperature field of soil cannot restore effectively.Heating capacity of the soil will be declining,and it leads to coefficient of performance of pump decline.Annual cooling and heating load is unbalanced.Soil temperature decreased year by year,which may affect the performance of the heat pump ground heat exchanger.Currently,Dual-source heat pump technology combined single-source heat pump system features has become one of the air conditioning industry research and development trends HVAC.Office Buildings in Shenyang is studied.The glass curtain wall was installed on the exterior walls.Air is heated by photovoltaic panels in exterior walls,and it is as the heat of air.Heating air and source heat pump are coupled to run for building heating in winter.Ground source heat pump runs separately to cool building in summer.Air-soil dual heat pump system is established.Annual dynamic load of building was simulated and analyzed by DesT.System equipment was selected according to simulation results,and relevant parameters are determined.Dual-source heat pump system model and a single ground source heat pump system model were established by TRNSYS.Energy consumption of each device system,heat pump COP change,ground inlet and outlet temperature,temperature field changes of soil in 10 years were simulated annual hourly.Operating results of system were analyzed.Economic analysis of the municipal pipe network and these two systems running were completed.Feasibility of dual-source heat pump system applied in cold regions need to be explored.In terms of energy consumption,the annual energy consumption of dual-source heat pump system is 25962.23 kWh,a single ground source heat pump system annual energy consumption is 45573.78kWh.Dual-source heat pump system is relatively save 43.03%of energy consumption.In terms of running costs and energy efficiency,it has obvious advantages.Two systems COP have reached normal operating requirements in operating efficiency.Dual-source heat pump runs more stable than single ground source heat pump system,and the COP is higher.In terms of the balance of soil,total absorbed heat of running system is 25354.68 kWh in simulation through the year.Total amount of stored heat is 21611.45kWh.Soil heat balance system is 117%,and it can maintain thermal equilibrium in annual cycle.Soil temperature would reduce 0.06 ? after dual-source pump running 10 years.While single ground source heat pump system would reduce 0.53 ?,and this is 8.83 times compared with dual-source heat pump system.The flounce on soil temperature after long time running in dual-source heat pump has dropped sharply relative to a single ground source heat pump in terms of flounce in soil temperature.Initial investment of dual-source heat pump system is reduced with respect to a single ground-source heat pump system.It avoids soil temperature field gradually imbalance caused by long-term cooling and heating load imbalance.Reliability of the system is improved with respect to the single solar system.It overcomes the deficiencies in summer cooling.