Simulation Research On Energy Saving Optimization Of Air Conditioning System In Farm Based On Trnsys

With the adjustment of rural economic structure and the support of national policies,the pig industry in China is rapidly changing to a large-scale and intensive feeding mode,and the modernization and scale of pig breeding will be the future development trend.In the current feeding management,whether the indoor temperature is stable or not will directly affect the survival rate of piglets,the growth and development of pigs and feed utilization rate.In view of the fact that the pig farm in this paper needs to consume a lot of groundwater and produce a lot of excreta,in order to realize the recycling of energy,the underground water source heat pump and biomass source heat pump are used as the cold and heat sources of the air conditioning system of the pig house in this paper.In addition,there is a large amount of ammonia in the pigsty,so it is not suitable to use the terminal equipment of the air conditioning system under wet condition,so the capillary radiation grid is used as the terminal equipment of the air conditioning system.In this paper,the delivery pig house is taken as the research object.Firstly,based on TRNSYS software,the delivery pig house building model is built to simulate the cold and heat load of air conditioning in winter and summer,and the accuracy of the capillary network model is verified.The influences of water supply temperature and flow rate on indoor temperature and cooling capacity of capillary net radiation terminal are discussed.The simulation analysis shows that when the water supply temperature of capillary network is reduced by 1?,the refrigerating capacity per unit area will increase by 4.38w/m²,and the indoor temperature will decrease by 0.63?,while the water supply flow does not significantly improve the cooling capacity of the capillary network.Then through the ANSYS software,the soil model under the biomass pool is established,and the annual vertical temperature change of soil under the biomass pool is analyzed,which provides the hourly change data of soil temperature around the horizontal buried pipe for the simulation of air conditioning system.Finally,in TRNSYS,four kinds of simulation models are built,which are the underground water direct supply radiant air conditioning system,ground water source heat pump+capillary grid radiation air conditioning system,the ground source heat pump radiant air conditioning system and the biomass source heat pump radiant air conditioning system.The indoor temperature,capillary water supply and return temperature,unit performance coefficient and system energy consumption of each design scheme are analyzed,and the comparison and analysis of ground source heat pump system and biomass source heat pump system are emphasized.in addition,the underground pipe is discussed to the pigsty the impact of CH₄ emission and the recovery of soil temperature.The results show that:in summer,compared with the biomass source heat pump system,the ground source heat pump system can save energy by 2.8%;in winter,the biomass source heat pump system saves 5.7%energy than the ground source heat pump system.In terms of the annual energy saving rate,the biomass source heat pump system has certain energy saving potential.Based on the biomass source heat pump system,ground water source heat pump+capillary grid radiation air conditioning system can save energy by 24.3%in the whole year,and the annual water consumption is 9162m³.Compared with the biomass source heat pump system,the total energy consumption of the underground water direct supply radiant air conditioning system in summer is 36080kWh lower and 88%of the energy is saved,but the annual water consumption is 21888m³.The system can't meet the requirements of indoor design temperature,and illegal water intake is strictly prohibited by the state,so the scheme is not applicable.In addition,when the horizontal buried pipe depth is 0.6m,the CH₄ emission in the pigsty will not be increased;if the winter biogas heat preservation system is added to the biomass source heat pump system,and the indoor temperature fluctuation is controlled within±1?,not only the problem of soil heat accumulation can be effectively alleviated,but also the energy saving potential of the biomass source heat pump system can be realized.For rural breeding projects,when there is no tap water supply,the underground water source heat pump+capillary grid radiation air conditioning system is preferred;for non rural breeding projects,when there is tap water supply,the biomass source heat pump radiation air conditioning system is preferred.Considering that the project is located in the countryside,the underground water source heat pump+capillary grid radiation air conditioning system is preferred,and the biomass source heat pump system is added with the winter biogas insulation system,which has certain energy saving advantages and does not need to exploit a large number of underground water resources,so the biomass source heat pump radiation air conditioning system can be used as an alternative.However,the underground water direct supply radiant air conditioning system can not meet the indoor design temperature requirements,and the underground water exploitation must meet the national regulations,so this scheme is not feasible.