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A concentric tube heat exchanger is used to evaporate boiler feed water into low pressure steam. Hot oils flows through the inner tube and the

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A concentric tube heat exchanger is used to evaporate boiler feed water into low pressure steam. Hot oils flows through the inner tube and the water/steam flows through the outer tube. The boiler feed water enters the heat exchanger and evaporates at 108 C. The oil enters at 26C and exits at 44 C. What is the corresponding log mean temperature difference

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