Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5°C at a rate of 20,000 kg/h under the following conditions: The unit will be of flood type, which will cool the products as they are conveyed into the channel filled with water. The products will be dropped into the channel filled with water at one end and be picked up at the other end. The channel can be as wide as 3 m and as high as 90 cm. The water is to be circulated and cooled by the evaporator section of a refrigeration system. The refrigerant temperature inside the coils is to be 22°C, and the water temperature is not to drop below 1°C and not to exceed 6°C. Assuming reasonable values for the average product density, specific heat, and porosity (the fraction of air volume in a box), recommend reasonable values for (a) the water velocity through the channel and (b) the refrigeration capacity of the refrigeration system.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Design a hydrocooling unit that can cool fruits and
vegetables from 30 to 5°C at a rate of 20,000 kg/h under the
following conditions:
The unit will be of flood type, which will cool the products
as they are conveyed into the channel filled with water. The
products will be dropped into the channel filled with water at
one end and be picked up at the other end. The channel can
be as wide as 3 m and as high as 90 cm. The water is to be
circulated and cooled by the evaporator section of a refrigeration
system. The refrigerant temperature inside the coils is to
be 22°C, and the water temperature is not to drop below 1°C
and not to exceed 6°C.
Assuming reasonable values for the average product density,
specific heat, and porosity (the fraction of air volume in
a box), recommend reasonable values for (a) the water velocity
through the channel and (b) the refrigeration capacity of
the refrigeration system.
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