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THERMODYNAMICS AND HEAT TRANSFER [ HEAT EXCHANGER] Hi I understand for heat exchanger there are two...

THERMODYNAMICS AND HEAT TRANSFER [ HEAT EXCHANGER]

Hi I understand for heat exchanger there are two ways to solve it, and find the q. Which are the log mean temperature difference and the effectiveness NTU method, I understand that for the NTU method is use when we are given the initial temp only, and for log mean temperature difference, is for different flows like parallel and counter flows. So I like to ask what else do I need to know, such like some common mistake, and stuff that is very important when solving question like these in a open book paper

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