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#### Lord Fin Tube--Finned tube heat transfer ratio

Finned ratio

1. 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. Finned ratio calculation example

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 light 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.