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Design Project

Design Project - ME 304 Heat Transfer Design Project Spring...

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Unformatted text preview: ME 304 Heat Transfer Design Project Spring 2009 Due: Tuesday, April 21, 2009 Formal, Typed Report Required Three students per group A company owns a refrigeration systems whose refrigeration capacity is 200 tons. You are asked to design a forcedair cooling system for fruits whose diameters do not exceed 7 cm under the following conditions: The fruits are to be cooled from 28oC to an average temperature of 8oC. The air temperature is to remain above 2oC and below 10oC at all times, and the velocity of the air approaching the fruits must remain under 2 m/s. The cooling section can be as wide as 3.5 m and as high as 2 m. Obtain reasonable values for the fruit properties (specific heat, density, etc.) and assuming a reasonable value of the packing of the box (i.e., fraction of air volume in a box), recommend reasonable values for the quantities related to the thermal aspects of the forced air cooling, including: a) How long the fruits need to remain in the cooling section b) The length of cooling section c) The air velocity approaching the cooling section d) The product cooling capacity of the system, in kg(fruit)/h e) The volume flow rate of air f) The type of heat exchanger for the evaporator and the surface area of the air side ...
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