Solution of HTRI finned tube parameters
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A gas heater was designed using HTRI, with finned tubes being used. When entering the data, there is one parameter related to the finned tubes that is unclear; please advise. Furthermore, the parameters shown in this figure are those built into the HTRI database; by examining these parameters, it can be determined whether this fin is an internal fin Images cannot be uploaded at the moment; I will copy the details below: (This parameter is entered in: Input summary-Geometry-Tubes-Fin geometry) Low Fins: Number of fins per unit length – 1102.4 fins/meter; Fin root diameter – 17.272 mm; Fin height – 0.889 mm; Fin thickness – 0.305 mm; Outside area/length – 0.1527 m2/m; Wall thickness – 0.711 mm; Fins in baffle holes – Yes. What does “Wall thickness under 0.711 mm” mean? This post was last edited by Beiming Yu on 2009-4-15 10:53.]
It refers to the outer fins; “Wall thickness under” means the thickness from the lowest point of the fin root to the inner diameter of the tube.
It should be the thickness of the seamless tube plus the welding thickness