Design and thermodynamic analysis of heat recovery method for closed-cycle heat pump drying system
In order to improve the specific moisture extraction rate(SMER)of the closed-cycle heat pump drying(CHPD)system,two heat recovery methods are designed for the application scenario of rice drying,which are equipped with a regenerator to pre-cool and recover waste heat from the moist air at the outlet of the drying chamber and the refrigerant at the outlet of the auxiliary condenser.The thermodynamic models of various CHPD systems were established,their thermodynamic characteristics were calculated,and sensitivity analysis and comparative analysis were conducted.The results show that the two heat recovery methods improve the SMER of the CHPD system without heat recovery by 0.46 kg/kWh and 0.50 kg/kWh,respectively.Moreover,the two can achieve a benign coupling,and the average SMER improvement of the CHPD system coupled with the two heat recovery methods is 0.85 kg/kWh at different drying chamber inlet and outlet temperature combinations.
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