In a process, a counter flow heat exchanger, is used to chill milk using a cold brine (sodium chloride) solution

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In a process, a counter flow heat exchanger, is used to chill milk using a cold brine (sodium chloride) solution. If the rate of flow of the brine is 1.8 kg s-1 and that of the milk is 1.05 kg s-1 , estimate the temperature to which the milk will be cooled if the brine enters at -8°C and leaves at 10°C, and if the milk enters the exchanger at 32°C. If the area of the heat-transfer surface of this exchanger is 65 m2, what is the overall heat-transfer coefficient? Take the specific heats to be 3.38 and 4.18 kJ kg-1 °C-1 for the brine and the milk, respectively.

 

1. Then Suppose you decided to use a parallel flow configuration for the same problem above, calculate and compare the number of thermal units (NTU) required for the 2 configuration.