STUDY ON SALT SOLUTIONN-BASED ENERGY-STORAGE HEAT-RECOVERY HEAT PUMP SYSTEM
A salt solution-based energy-storage heat-recovery heat pump(SEHHP)system is proposed in this paper,which consists of a heat-recovered compression heat pump subsystem and solution-based heat storage/release subsystem.At power-valley hours,the air source heat pump subsystem is used to convert electric energy to chemical energy which is stored in salt solution and phase change material.During the heating hours,the cascaded heat pump system,where air source heat pump subsystem is cascaded with the salt solution-based heat storage/release subsystem,is used for space heating,and helps decrease the total electricity consumption for heating at power-peak hours.The thermodynamic model of SEHHP system is developed to compare the hourly heating performance of SEHHP with phase-change energy-storage air-source heat pump(PEAHP)system,and the economy for the two systems are evaluated.The results show that the heating performance and economy of SEHHP system are better than that of PEAHP system.The daily energy consumption of SEHHP system is 34.18% lower than that of PEAHP system,and the comprehensive heating performance coefficient(CCOP)of SEHHP system is increased by 52.20%,as compared with PEAHP system,while the annual cost of SEHHP system is reduced by 9.23% .The proposed system is suitable for the heating areas with large difference between peak and valley power price.
heat recoveryheat pumpsolution energy storageheating coefficient of performance(CCOP)economic analysis
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