When I studied the application* Concentric tube heat exchanger(Application Library path: Heat_Transfer_Module/Applications/concentric_tube_heat_exchanger, version: 5.4), I found a variable *ht.DeltaH in the expression of E (effectiveness of heat exchanger), which I couldn't find it in the Help document. What is the meaning of the variable ht.DeltaH ? Thanks for your help!
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