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Lord Fin Tube--Finned tube heat transfer ratio

Finned ratio

1. What is finned ratio?
Finned ratio definition: Finned ratio refer to the expansion surface after the bare tube (base tube surface) in the installation of the fins.

Fin tube structure parameter can be represented by "β", i.e.

β = (the total surface area of the fin tube) / (the surface area of the bare tube)

2. How to calculate finned ratio?
 
Calculation example:
A fin tube, CPG (25 x 2.5 / 50 / 4 / 1 - Fe/Fe), calculate the fin ratio
1 meters long fin number n= 1000 / 4 =250
Fin area 1 meters long

Af = 250 * PI [/4 (Df^2-Db^2) 2+ * Df * T] =0.775 m pi
1 meters length on the bare tube area, namely the tube area without fin 
Ao = π * Db * 1 * (P-T) /P = 3.1416 * 0.025 * 1 * 3/4=0.0589 M
1 meters length of the bare pipe area
Ab=3.1416 0.025= x Ab 0.0785 M

Finned ratio
β= (Af+AO) (0.775 +0.0589) / 0.0785 = 10.62

Then it means finned tube heat transfer area is 10.62 times the size of the bare tube.

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