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Question: A counterflow heat exchanger is employed to cool 0.55 kg/s

24 Aug 2024,11:36 PM

 

A counterflow heat exchanger is employed to cool 0.55 kg/s (CP = 2.45 kJ/kg-K) of oil from 115°C to 40°C by the use of water. The inlet and outlet temperatures of cooling water are 15°C and 75°C, respectively. The overall heat  transfer coefficient is expected to be 1450 W/m2-°C. Using the NTU method, calculate the following:

a. The mass flow rate of water.

b. The effectiveness of the heat exchanger

c. Surface area required

 

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