HEMethod - ME 416 Computer Assisted Design of Thermal...

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1 ME 416 Computer Assisted Design of Thermal Systems Heat Exchanger Calculations Effectiveness-Ntu Method Two Types of Problem: Rating Problem or Sizing Problem Rating Problem: The heat transfer surface area is known. Exit temperatures are unknown. This is like using a heat exchanger given to you off the shelf, where you know everything about it except for how it works. That is, what exit temperatures it will produce. You will be able to calculate the Ntu from information given, but will have to calculate or determine the effectiveness from an ε -Ntu relationship or graph. Sizing Problem: All of the operating conditions are known or can be calculated from the first law of thermodynamics. The heat transfer surface area is unknown. This is like being told what temperature requirements the heat exchanger must have and then calculating how large it must be. You will be able to calculate the effectiveness from the information given, but will have to calculate or determine the Ntu from an
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HEMethod - ME 416 Computer Assisted Design of Thermal...

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