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How to input dependency between max sheath temp and wattage?

Question asked by Qi Hongming on Apr 2, 2014
Latest reply on Apr 3, 2014 by Jared Conway

We have one electric process heater ( this is similar to tube-shell exchanger, only output constant heat flux by tube),fluid is air, which is pumped into heater at constant temp and presure, Heater wattage is from 0-100% adjust, example full wattage is 100Kw, I want to simluate watt increase by steps (such as 5KW), If the maximum temp of tube is up to 200C, the simulation is finished, I want to know how to input dependency between max tube temp and wattage by flow simulation?