Study On The Optimization Of Combined Heat Pump Hot Water Production System With Multi-sources

The hot water consumption of public buildings accounts for 20%~40% of the building energy consumption,showing a growing trend.In public places with large and concentrated water consumption,such as swimming pools and baths,the energy consumption required for the productionof hot water even accounts for 80% of the energy consumption of such buildings.Conventional methods of hot water production,such as gas-fired boiler and water transport by tanker of power plant,have the defects of high heating cost,great safety hazard and environmental pollution.However,there are also some problems in the productionmethods of clean hot water,such as solar collector and heat pump,etc.The solar collector cannot be widely implemented due to the restrictions of site,weather and investment cost.The heat pump usually adopts air source heat pump and sewage source heat pump.The heat production condition of air source heat pump is not good in winter,and the waste heat recovery of sewage source heat pump is insufficient,which requires auxiliary other heat sources.In view of the above problems,this paper proposes a multi-source complementary combined heat pump hot water production system,which organically combines the advantages of air source heat pump and sewage source heat pump,so as to improve the energy efficiency of the system throughout the year.On the basis of the operation principle of heat pump,the design parameters that affect the heat pump’s heating condition are analyzed,and the change rule of its influence on the heat pump is explored.The results show that the proportion of waste heat in heat production is closely related to the sewage recovery rate,and the heat pump system design can achieve the maximum energy saving on the premise of full recovery of waste heat from sewage.Considering the influence of the key parameters of heat pump and the variation law of sewage residual heat,it provides a theoretical basis for the following system optimization research.For heat pump link related evaluation index and establish the mathematical model According to the operation characteristics of the bath,the process of the combined heat pump hot water preparation system with complementary air source and sewage source is put forward,the two combined heat pump modes of the new system are analyzed and their operation characteristics are explored,the four-way valve switching operation scheme is put forward,and the operation mode of the new system is flexibly switched according to the changes of the outdoor environment.A mathematical model of EES was established for the air source-sewage source heat pump system as an example.Put forward a new system in the process affect the system running effect of the key parameters and intensive research,compared to two kinds of heat pump portfolio model under the influence of key parameters in the system and the change of the consumption of energy efficiency,system optimization direction,maximum reduce the outside disturbance to the system operation,realize combined heat pump hot water production system integration design.In addition,the annual system performance index is discussed,which shows that the two heat pump combination modes have the advantages of periodic operation.Taking yanshan university’s east campus bath as an example,a new annual operation strategy of the system was constructed.Through comparative analysis with other hot water production methods,the new system showed great advantages in three aspects of equipment utilization,energy efficiency and economic benefits,indicating that the research content of this subject has practical application value.