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Experimental investigation of a part air dehumidification cascade-like heat pump drying system

2021; Elsevier BV; Volume: 131; Linguagem: Inglês

10.1016/j.ijrefrig.2021.07.035

1879-2081

Dechang Wang, Xue Cao, Xuerui Li, Yanhui Li, Xuezhi Wang,

Adsorption and Cooling Systems

In the cascade-like heat pump drying system, there are contradictions between the low air flow rate for dehumidification and high air flow rate for anti-overpressure. In order to resolve those contradictions, a new PADHPD (part air dehumidification heat pump drying) system was proposed in this work. A PADHPD system used in the industrial production was designed and manufactured. The thermodynamic performance of this was tested and simulated. The air temperature and humidity in the drying system and the thermal parameters of the HPUs (heat pump units) were analyzed. The hawthorn cake was taken as the drying material. According to the estimation from the experimental results, the average COP (coefficient of performance) of the heat pump system is 3.58 with the average SMER (specific moisture extraction rate) of 2.282 kg kW−1 h−1 when the average temperature and RH (relative humidity) of supplied air is 63.1°C and 20.2 %, respectively. EER (energy efficiency ratio) of the system is 2.68 but SMER is 1.792 kg kW−1 h−1 after the electric energy consumed by circulating fans being considered. Exergy analyses shows that it is necessary to reduce the irreversible loss in the evaporator because it represents the largest exergy loss for each HPU.