Study Of The Air Source Double Stage Coupled Heat Pump Conditioning System With Energy Storage Tank Combined With Solar Energy

With the continuous improvement of living standards,the proportion of the building energy consumption is growing,building energy consumption of china accounts for 40%of total energy consumption of the whole society.At present,the heating mode of our country mainly through the burning of fossil energy,low utilization of primary energy polluted the environment seriously,which is an important factor causing fog and haze.Heat pump technology can achieve energy used by the energy grade,combining it with the use of renewable energy is an energy-efficient heating and air conditioning mode,among them,air source heat pump is the most widely used in the heat pump because of its simple installation,convenient operation and management,but a single air source heat pump system has problems of frost and poor heating performance at low temperatures.The research status of domestic and international of heating and air conditioning system were investigated,combined with the cold climate and building load characteristics,the air source double stage coupled heat pump conditioning system with energy storage tank combined solar energy was proposed(hereinafter referred to as the composite heat storage air conditioning system),this system mainly uses the off-peak electricity drive to achieve the high efficiency of solar energy and environmental air,and can greatly improve the energy saving,economy and reliability.The following aspects were studied in the paper,which was based on the composite heat storage air conditioning system:Firstly,the system of the composite heat storage air conditioning system was constructed,the system components and the main operating modes were introduced,taking a 1000m2 office building in Urumqi as the research object,the system design parameters were optimized and the optimum design parameters were obtained.Secondly,in order to build a mathematical model of the main components of the system,the design parameters of the air source heat pump and water source heat pump evaporator and condenser were determined.In order to study the internal heat transfer characteristics of the evaporator and condenser,the model of the two reactor was established by the method of establishing the partition lumped parameter model.At the same time,the establishment of a lumped parameter model,such as the collector,the seasonal energy storage device,the night energy storage device,the compressor,the throttle valve,and the models were solved.Once again,according to the mathematical model of the components of the air source heat pump and water source heat pump system,the optimization of the intermediate water temperature was determined,mathematical models for the optimization of the intermediate water ring were constructed,the optimal results were analyzed and the optimal intermediate water temperature values were obtained under different environment temperatures.Finally,based on the model of the system,the control strategy of the system was determined,taking a 1000m2 office building in Urumqi area as an example,the whole system running characteristics of the system were simulated,and the operating parameters of the system were analyzed.In addition,the typical cold regions of China(Shenyang,Changchun,Harbin)for simulation,study on the applicability of the system in different regions.For the same building objects,the present program and central heating and split air programs were analyzed in terms of energy efficiency and economy.The air source double stage coupled heat pump conditioning system with energy storage tank combined solar energy,given full consideration to the climate features and building load characteristics of cold area,and realizes the comprehensive utilization of solar energy and air energy,on the basis of guaranteeing the reliability of the system,makes full use of off peak electricity driven,not only reduces the operation cost of the system,but also improves the efficiency of power grid.The simulation results show that the composite heat storage air conditioning system has good energy saving and economy,and a certain application feasibility.