Thermal Insulation Efficiency of a Polystyrene Box for Thermal Insulation Packaging of Quick-Frozen Fresh Corn
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Abstract:
This study developed a suitable box for insulation packaging of quick-frozen fresh corn to prolong its thermal insulation period. The effects of the densities of molded polystyrene (EPS), extruded polystyrene (XPS), and rigid polyurethane (PU) and of environmental temperature on the coefficient of thermal conductivity by using hot-wire method were examined. In addition, the effects of the thickness of the insulation box and mass ratio of coolant and quick-frozen fresh corn on the thermal insulation efficiency of XPS insulation-packaging box were investigated. The results showed that thermal conductivity decreased with an increase in density and increased with an increase in environmental temperature. However, environmental temperature exerted different effects on different materials used for developing the insulation-packaging box. Thermal insulation efficiency of the XPS thermal insulation-packaging box gradually improved with an increase in its thickness. Thermal insulation-packaging box having a thickness of >30 mm showed significantly increased thermal insulation efficiency. However, an increase in the mass ratio of the coolant and quick-frozen fresh corn decreased the thermal insulation period at the center of the insulation box after an initial increase. Thermal insulation period of quick-frozen fresh corn in a 40-mm XPS thermal insulation-packaging box can be effectively extended to >36 hours by maintaining the temperature at 23 ℃, humidity at 50%, and mass ratio of the coolant and quick-frozen fresh corn at 5:8.
