Research On Waste Heat Recovery System Of Bath Pool In Colleges And Universities Based On Air-Sewage Source Compound Heat Pump

With the worsening of the world energy problem,the environmental pollution problem has aroused the public's vision more and more.There are two technical measures to solve the problem of energy shortage:one is to develop new energy sources,the other is to improve the energy efficiency.In recent years,energy consumption rate is too fast,waste heat recovery has become one of the important technical means to solve the energy shortage.The topic of the 13th five-year Plan"Research on low-grade waste heat cascade system and high efficiency utilization technology in auxiliary service area"is carried out,and the waste heat produced by the baths in colleges and universities is taken as the research object.A combined air source-sewage heat pump system is designed for waste heat recovery of bath pool in colleges and universities.As an important part of public buildings,University baths are densely populated,consume a lot of energy and waste heat.Fifteen bathtubs in Colleges and universities were investigated on the spot,and two bathtubs with central heating and sewage source heat pump were tested on the spot.The average flow rate of the bathtub during operation was 20.4 m~3/h,and the drainage temperature of the floor drainage was stable in the range of 28-34?.In summer,the temperature of water storage tank for bathing pool water supply should be more stable.The lowest temperature is 55.8?,the highest temperature is 62.4?,and the rest of the time fluctuates slightly in the range of 56-61?.The water temperature of water supply in winter is lower than that in summer.The lowest temperature is 47.2?,and the temperature distribution is basically stable between 47.2 and 56.8?.Combined with the foundation of preliminary investigation and test,this paper constructs the waste heat recovery system of air source-sewage water compound heat pump in colleges and universities,and forms the strategy of dual-source combined operation of compound heat pump.On the basis of ensuring the supply of hot water in the bath,the waste heat produced in the bath can be recovered.At the same time,it can also effectively dehumidify and reduce fog in the bath area and provide a cold source for summer air conditioning.two sewage source heat pumps(HCRB(A)-Y100)and one air-source heat pump(MKZ?-2131)are selected by calculation.The simulation results with TRNSYS show that the output temperature of the system unit can meet the requirement of the bath in colleges and universities.Water supply requirement in bath area,total energy consumption of the system is 1.52?10~6kwh.The annual cumulative heat supply of the sewage source heat pump unit is 4.80?10~6kwh.The annual cumulative heat supply of the air source heat pump unit is 1.28?10~6kwh.The average COP of sewage source heat pump unit is 5.25,and the average COP of air source heat pump unit is 3.26.Through the TRNSYS simulation results and the basic theory of waste heat technology,combined with the actual operation of the system,it can be calculated that the waste heat utilization ratio of the college bath complex heat pump system is 78%,for the college bath complex heat pump,The economic and environmental benefits of the central heating and sewage source heat pump systems are evaluated and analyzed.The results show that the economic benefit of the college bath complex heat pump system is the best and the central heating system is the worst.The method of converting energy consumption into standard coal is to compare the energy-saving and environmental benefits,and the results show that the design of the complex heat pump system in colleges and universities is obviously superior to the other two systems.And waste heat for the future public institutions Utilization provides some new ideas.