Hello,
I am modelling a superheater in simulink. Is there any correlation to find overall heat transfer coefficient of superheater with respect to temperature? Or is there any constant reference value to consider . Please let me know.
Thank you.
Dear Vishnuvardhan
I don't think so. The overall heat transfer coefficient is dependent on geometry (number of tubes and passes, tube inner and outer diameter, tube length, arrangement type, longitudinal and transverse pitch), tube material, and flow rates of both streams (flue gas and steam).
So it is independent of temperature but is in relation with temperature rise of steam. However, as I said there are many other important parameters.
Depends on what type of heater is your superheater. Correlations are available for all different types of heat exchangers. It is recommended using the following standard methods for designing of heat exchangers (Available in standard HT textbooks such as Incropera):
The Effectiveness – NTU Method
The LMTD Method
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