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1Initial CoolingJim Thompson and Michael ReidPostharvest physiology and HandlingPostharvest physiology and Handling LaboratoryHanoi, October 2010COOLING METHOD• Conduction• Convection• Radiation– Of little importance at these temperaturesCOOLING MEDIUM• Air– Convection• Water– Conduction• Ice– Conduction and convectionCooling the medium•Mechanical refrigeration– Ammonia, Freon•Thermal refrigeration•Evaporative cooling•Underground cooling• Ice/Snow•Night air •Dry ice, liquid nitrogenEvaporative coolingCooling Begins in the Field•Prevent heating in the field.•Shorten time before cooling begins.
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2Shade product to reduce heat gain and moisture losswater sprayCarrot ReceivingUse frequent, scheduled pick upProduct temperature drop is rare in trailers.Transport CoolingSlow cooling in marine transportVertical Airflow