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Question: A hypothetical countercurrent heat exchanger having an infinite heat transfer area is used to cool 10,OOO lbmassh of water entering at 150°F. The coolant is 5,000 lbmass/h of water entering at 100°F.

a) What are the exit temperatures of the streams?

b) What is the rate of heat transferred?

2. A fluid is heated in a heat exchanger by condensing steam. Derive the log mean ?T to use when

C_p = a + bT

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