Research And Application Of Control Strategy Of Solar-Heat Pump Hot Water System

Energy conservation and emission reduction is the main development direction of all fields in China nowadays.With the development of economy and the progress of society,people's demand for energy is increasing,and the problem of energy shortage is becoming more and more prominent.Solar energy is one kind of renewable energy,which is inexhaustible,and making full use of solar energy is an effective way to solve the global energy shortage.The Air Source Heat Pump can absorb the low-temperature heat source in the air,and produce the gas or liquid heat source which with higher temperature through the temperature promotion of the heat pump.The combination of the air source heat pump and the solar energy heat collection system can effectively make up for the shortage of heat supply and low efficiency of the traditional solar energy hot water system in the case of insufficient light,such as rain,snow,etc.,and it is widely used in all types of hot water projects.The research content of this project is that according to the operation characteristics of the Solar-air Source Heat Pump Hot Water System,achieve the efficient control of the operation of the Air Source Heat Pump on the premise of meeting the water demand,and then make full use of the solar energy.The specific work is as follows:(1)The design and implementation of heat pump operation control strategy for Solar-air Source Heat Pump Hot Water System.Based on the operation principle of Solar-air Source Heat Pump Hot Water System,the operation control strategy of Air Source Heat Pump is put forward on the premise of making full use of solar energy and meeting water demand;According to the characteristics of heat pump operation,combined with the historical data of heat pump operation,the calculation model of heat pump heating capacity is established;The influencing factors of collector performance are analyzed,and the calculation model of collector performance based on normal distribution is established;Simulate the operation of heat pump and optimize the operation parameters of heat pump by using TRNSYS.(2)The establishment of the system simulation model and the analysis of energy consumption.According to the characteristics of Solar-air Source Heat Pump Hot Water System,the simulation model of Solar-air Source Heat Pump Hot Water System is established.Introduced the traditional control strategy and the energy-saving control strategy of heat pump operation which is proposed into the model.The operation of the system in different weather conditions,seasons and the whole year is analyzed.And the energy consumption and economic benefits of these two controlstrategies are also analyzed.The results show that: compared with the traditional control strategy,the energy saving control strategy can delay the opening time of heat pump,reduce the number of opening and opening time of heat pump,and give priority to the use of solar energy to heat the hot water,which can fully utilize solar energy and achieve better energy saving and economic benefits.(3)Design of Solar-air Source Heat Pump Hot Water Control System.According to the working principle of the solar air source heat pump hot water system,the mathematical model of each module and the proposed energy-saving control strategy,taking the touch screen as the control core,the solar air source heat pump hot water control system is designed.The system design,the selection of controller and sensor,the development of control program,the design of human-computer interaction interface are completed,and the functions of data collection,calculation,display,transmit and alarm are realized.The test results of the system running show that it is consistent with the simulation results.