A 10-m-long countercurrent-flow heat exchanger is being used to heat a liquid food from 20 to 808C. The heating medium is oil, w
hich enters the heat exchanger at 1508C and exits at 608C. The specific heat of the liquid food is 3.9 kJ/(kg K). The overall heat-transfer coefficient based on the inside area is 1000 W/ (m2 K). The inner diameter of the inside pipe is 7 cm. a. Estimate the flow rate of the liquid food. b. Determine the flow rate of the liquid food if the heat exchanger is operated in a concurrent-flow mode for the same conditions of temperatures at the inlet and exit from the heat exchanger.
1 answer:
Answer:
mlf=0.5038kg/s
Explanation:
a. Please kindly check attachment for the step by step solution
b. B) in concurrent flow heat exchanger same exit temperatures for both fluids cannot be obtained. Since tho<tco
Case ii) only liquid food is considered tci=20 &tco=80
Cp=3.9kj/kgk
&If Q is same then mlf=0.5038kg/s this is same as case a
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