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FST50-Hmwrk#1-08

# FST50-Hmwrk#1-08 - f C L = heat capacity of green peas with...

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J. M. Krochta FST 50 Spring 2008 FST 50 – Introduction to Food Preservation Homework #1 – Refrigeration Load Due Friday, April 18, 2006 Refrigeration Load for Freezing Green Peas .   Your company wishes to buy a freezer capable  of reducing the temperature of 1000 lbs of peas/hr (W), from an initial  temperature (T i ) of 70 ° down to a storage temperature (T s ) of –18 ° F.  Using the heat capacity (specific heat) of green  peas with water in the liquid state, latent heat of fusion (freezing) for green peas, heat capacity  (specific) for green peas in the frozen state and average respiration rate for the green peas  during the process listed below, calculate the refrigeration load (H R ) required of the freezer in  Btu/hr.  To simplify the calculation, assume all the water in the peas freezes at 30
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Unformatted text preview: f ). C L = heat capacity of green peas with water in liquid state = 0.79 Btu/(lb °F) h f = latent heat of fusion (freezing) of green peas = 106 Btu/lb C S = heat capacity of green peas with water in frozen state = 0.42 Btu/(lb °F) h r = average heat of respiration of green peas during process = 0.94 Btu/(lb hr) For the problem : • Show the equation(s) necessary for solution of the problem. • List values for the components of the equation(s) which you will use to solve the problem, always being sure to use units along with any value. • Use the values in the equation(s) to solve the problem, always being sure to use units along with any value. • Draw a rectangle around your answer....
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