Reserch On The Air Heating Source Ground Thermal Storage Heat Pump Heating And Cooling System For Greenhouse In Cold Region

The glass greenhouse,which is a special building to ensure normal crop growth inthe harsh environment, required strict control of temperature.But,in the cold region,thegreenhouse have the characteristics of ineffective thermal、high heat transfer coefficientand the indoor temperature fluctuation amplitude. If the greenhouse don`t adopt heatingand cooling, the crops would not grow properly. Hence,the greenhouse need to controltemperature and humidity.Based on the analysis of the cooling an heating system for greenhouse,this articleproposed the ground source heat pump heating and cooling system for green house incold region.In roder to study the feasibility of system,simulation model was establishedby TRNSYS software.First,we selected the crop in greenhouse,and determined the temperaturea rangeaccording to the crop characteristics and design the structure of greenhouse.weestablished the building model, caculate the heating and cooling load in the designtemperature by TRNBuild software.On the basis of building load,select the appropriatepalisade structure.we analyzed the effect of ventilation,shade net,inside thermal screen.Then,according the cooling and heat load,we selected the equipment parameters,the heating season and cooling season. In this paper, we established the systemsimulation model, set the start and stop condition,operation model.The model of thesystem simulate the heat storage,take heat,soil natural recovery season, concludes thesystem data,and analyzed soil temperature field change,heat pump COP,inlet and outlettemperature.Finally,compared the economy of the system with common ground sourceheat pump,proved the feasibility and economics of the system.The system provide the theory for the greehouse heating and cooling.The theorypocided the reference for engineering practice.