Study On The Coupling System Of Exhaust Heat Recovery And Water Source Heat Pump In A Station In Shenyang

In recent years,the social and economic development of our country is increasingly accelerating,the growing demand for energy and the inability of energy supply to meet the growth in energy demand are becoming increasingly acute.Buildings account for a large proportion of total social energy consumption among them.Therefore,it is the only way to realize the sustainable development of energy resources in HVAC engineering to find alternative energy sources instead of traditional air-conditioning energy conservation methods.The railway station has a large flow of people,per capita energy consumption is higher,dense crowd flow produces excess heat.However,this part of the heat is often not used effectively,but is outdoors with the building exhaust.On the other hand,the high efficiency utilization of water source heat pump for renewable energy has made it widely concerned and vigorously developed.However,the problem that the system can not run for a long time in winter and summer because of the imbalanced exothermic,which restricts the promotion of water source heat pump.In view of the current energy situation in China and the shortcomings of the heating system in the north,the coupling system of exhaust heat recovery and water source heat pump in a station in Shenyang is proposed in this paper.The coupling system selects the air source heat pump,which has a heat lift function to recycle the exhaust heat of the station.It realizes an efficient combination of air source heat pump and water source heat pump.The air source heat pump recovery station exhaust heat reduces the waste of heat.Moreover,the exhaust efficiency above the outdoor temperature is used as a low level heat source to improve the thermal efficiency of the air source heat pump.The application of water source heat pump has made up for the unstable defects of the waste heat.The composition,working principle and system characteristics of the coupling system are briefly explained.The three mode of operation is proposed wilch include air source heat pump for living hot water and underground water source heat pump for refrigeration,underground water source heat pump for refrigeration,air source heat pump and underground water source heat pump to prepare domestic hot water and Complementary heat supply of air source heat pump and underground water source heat pump.The Shenyang area is cold and long in winter,and has large energy consumption and great energy saving potential.Therefore,the winter air source heat pump and water source heat pump complementary heating operation mode is simulated and calculated in detail,and the energy saving potential and feasibility of the system are determined.The Dest software is used to simulate the load of the building with heating area of 6078.4m2.And the simulation model of air source heat pump and water source heat pump complementary heating system is established by using TRNSYS software.It is possible to draw a conclusion that the annual total energy consumption of the system is 2.20×105 KW·h,which is converted into a primary energy consumption of 2750MJ.Compared with the simulation results of the heat supply system using the underground water source heat pump and the coal-fired boiler,the energy consumption of the system is reduced by 39.89%and 59.22%.The performance coefficient of the air source heat pump can reach up to 4.62,and the efficiency of the system is high.Based on the principle of ecological optimization,the objective formula of ecological optimization is established.It is concluded that in order to increase the performance coefficient of complementary heating system,the temperature range of high temperature heat source should be guaranteed to be 310K<TH<320K.According to the simulation results,the complementary heating system and groundwater source heat pump,coal-fired boiler and gas boiler heating system are compared from two aspects:system energy efficiency and economy.In terms of system energy efficiency,the energy efficiency of the system is 8.74kg/m2,and the primary energy utilization ratio is 1.13.On the economic side,compared with the electric heat pump and coal fired boiler,the system saves 7 million 290 thousand yuan and 2 million 965 thousand yuan after 15 years of operation.