Cooling Hanoi [Compatibility Mode] - Copy

Cooling Hanoi [Compatibility Mode] - Copy - Initial Cooling...

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1 Initial Cooling Jim Thompson and Michael Reid Postharvest physiology and Handling Postharvest physiology and Handling Laboratory Hanoi, October 2010 COOLING METHOD • Conduction • Convection Radiation • Radiation – Of little importance at these temperatures COOLING MEDIUM •A i r – Convection Wate • Water – Conduction •Ice – Conduction and convection Cooling the medium • Mechanical refrigeration – Ammonia, Freon • Thermal refrigeration • Evaporative cooling • Underground cooling • Ice/Snow • Night air • Dry ice, liquid nitrogen Evaporative cooling Cooling Begins in the Field • Prevent heating in the field. • Shorten time before cooling begins.
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2 Shade product to reduce heat gain and moisture loss water spray Carrot Receiving Use frequent, scheduled pick up Product temperature drop is rare in trailers. Transport Cooling Slow cooling in marine transpor Slow cooling in marine transport Vertical Airflow
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3 Room Cooling Room Cooling •2 .8 m 3 /min per tonne of product.
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This note was uploaded on 12/04/2010 for the course AGRONOMY PLB174 taught by Professor Michaelreid during the Spring '10 term at UC Davis.

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Cooling Hanoi [Compatibility Mode] - Copy - Initial Cooling...

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