Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 28 Feb 2018 My Price 4.00

box made of polypropylene

A 1.5-kg box made of polypropylene (cp = 1.9 kJ/kg · °C) contains 30 loaves of white bread, each 0.45 kg, with a water content of 37.3 percent (by mass) at 20°C. The breads are to be frozen to an average temperature of 12°C in 3 h in their box by refrigerated air. The enthalpy of bread is given to be 137 kJ/kg at 0°C and 56 kJ/kg at 12°C. Taking the average specific heat of the bread above 0°C to be cp = 2.60 kJ/kg · °C, determine (a) the total amount of heat that must be removed from a box of breads and (b) the average rate of heat removal from the breads and their box to the air per box.

 

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Maurice Tutor
(5)
Status NEW Posted 28 Feb 2018 10:02 PM My Price 4.00

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