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A liquid to liquid counterflow heat exchanger is used to heat cold fluid from 50?C to 150?C. Assuming that the hot fluid enters at 250?C and leaves at 200?C, the log mean temperature difference for the heat exchanger will be closer to

[A].	100?C	[B].	128?C
[C].	133?C	[D].	137?C

Answer: Option B

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