Cover Story Part 1: Heat Flux And Film Temperature In Fired, Thermal-Fluid Heaters
The importance of these factors is often overlooked. Learn how to determine if you are overheating the fluid film in your system
R.G. Pelini RGP Engineering
In a fired thermal fluid heater, a thermal fluid is heated by the metal surfaces of a fired heater or fluegas heat-recovery exchanger. Generally, the heat input rate is controlled to achieve some desired bulk-fluid temperature exiting the heater. However, in being heated to the outlet setpoint, the fluid film in contact with the heating surface is always exposed to a higher temperature than the bulk fluid. In many applications it is the fluid film temperature, not the bulk fluid temperature, that limits the duty of the heater and the usable life of the fluid....
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