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Room cooling is traditionally used for postharvest products and is always involved with heterogeneous airflow and heat transfer. Despite the current evaluation of such heterogeneity, the irreversibility parameters are still not considered to evaluate the corresponding characteristics. Furthermore, the relationships between the irreversibility and the heterogeneous airflow and heat transfer should be also analyzed. To this end, based on the numerical simulation using an experimentally validated model, the distribution characteristics of air velocity, local mean air age, temperature, local volumetric rates of entropy generation, and entransy dissipation during the room cooling process for postharvest apples are respectively discussed. The relationships between the irreversibility parameters and apparent heterogeneity are further analyzed. The results show that higher local mean air age and temperature inside bins are resulted by lower air velocity nearby, and significant local volumetric rates of entropy generation and entransy dissipation at the surfaces of bins are also obtained for longer duration in the room cooling process. The irreversibility parameters, including local volumetric rates of entropy generation and entransy dissipation, are related to local mean air age with the Pearson’s coefficients of between 0.60 and 0.80 and better related to temperature with the Pearson’s coefficients of above 0.80.

Irreversibility Analysis Related to Heterogeneous Airflow and Heat Transfer during Room Cooling of Postharvest Apples