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Postharvest biology and technology v.126, 2017년, pp.67 - 75   SCI SCIE SCOPUS
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Forced-air cooling of polylined horticultural produce: Optimal cooling conditions and package design

O'Sullivan, Justin L. (Massey Institute of Food Science and Technology, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand ) ; Ferrua, Maria J. (Massey Institute of Food Science and Technology, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand ) ; Love, Richard (Massey Institute of Food Science and Technology, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand ) ; Verboven, Pieter (University of Leuven, division BIOSYST-MeBioS, Postharvest group, Willem de Croylaan 42, Heverlee, Belgium ) ; Nicolaï, Bart (University of Leuven, division BIOSYST-MeBioS, Postharvest group, Willem de Croylaan 42, Heverlee, Belgium ) ; East, Andrew (Massey Institute of Food Science and Technology, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand ) ;
  • 초록  

    Abstract A 3-D computational fluid dynamics (CFD) model of palletised polylined kiwifruit packages undergoing forced-air cooling was used to determine an optimal operating point. Two operating conditions (pressure drop and flowrate across the pallet) were tested and the results evaluated based on cooling rate, uniformity, energy requirement and pallet throughput per week. An optimal operating point of 100Pa (0.25Lkg −1 s −1 ) ensured relatively rapid cooling of the produce, without incurring excessive operational costs due to the energy requirements. Based on the results an alternative package was designed with the aim of redistributing the incoming refrigerated airflow to channel cool air through the pallet layers before directing it towards the slowest cooling packages, located at the back of the pallet. Evaluating the new design at the optimal conditions for the current package showed that at constant flowrate both pressure drop and energy requirement to achieve half-cooling time (HCT) were reduced by 24%, while improving cooling uniformity and pallet throughput per week. Alternatively, keeping the pressure drop constant required a similar energy input, while further increasing the cooling uniformity and pallet throughput. Highlights CFD model analyses cooling performance of polylined horticultural produce. Cooling performance measured by the cooling rate and uniformity. Power consumption of the fan and number of pallets cooled per week considered. Optimal operating point of 100Pa (0.25Lkg −1 s −1 ). Performance improved by controlling airflow distribution between packages.


  • 주제어

    CFD .   Precooling .   Horticulture .   Polyliner .   Package design .   Operational cost.  

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