Table of Contents
How do you calculate fin efficiency?
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- The fin efficiency is defined as the ratio of the heat transfer to the fin to the heat transfer to an ideal fin. ηth =
- qfin. hAfin(Tb − T∞) , Tf = T∞,and Afin = 2Ac + Atip (Square and Recatngular ) 1.35.
- Atip = t × W. Fig. 2.4. Rectangular Fin. For cylindrical: Afin = πDL +
How do you calculate fin surface area?
The Fin surface area formula is defined as the area on the surface required for the fin for effective heat transfer is calculated using Surface Area = (pi/2)*Number of fins*((Fin diameter^2)-(Outer diameter^2)). To calculate Fin surface area, you need Number of fins (NF), Fin diameter (FD) & Outer diameter (do).
How big is an error in the analytical calculation of annular fin efficiency?
The results show that fin efficiency determined by numerical simulations is greater by up to 12.3% than the efficiency calculated analytically.
What is the value of fin efficiency?
Fin effectiveness is the ratio of the rate of heat transfer by use of fin to the rate of heat transfer without fin. The value of effectiveness indicates the increase in the rate of convective heat transfer from the body after the addition of fins, therefore the value of effectiveness should be greater than 1.
Under what condition the fin efficiency will become 100 %?
Under what situations does the fin efficiency becomes 100%. The heat transfer from the fin will be maximum. For the cases of a constant cross-section of very long fins and fins with insulated tips, the fin efficiency can be 100.
What is profile area of fin?
The fin profile is defined according to variation of the fin thickness along its extended length. For example, the cross-section area of the fin may vary as where is the width of the fin, is the fin thickness along the length.
What do you understand by annular fin?
In thermal engineering, an annular fin is a specific type of fin used in heat transfer that varies, radially, in cross-sectional area.
What is perimeter of circular fin?
Each of the four cylindrical fins has a cross sectional area Ac = π(0.005 m)2/4 = 19.635×10-6 m2 and the perimeter p = π(0.005 m) = 0.01571 m. The corrected length, Lc = L + Ac/p = 0.03 m + (19.635×10-6 m2) / (0.01571 m) = 0.03125 m.
Can fin efficiency be less than 1?
The fin efficiency will always be less than one, as assuming the temperature throughout the fin is at the base temperature would increase the heat transfer rate.
What are the different types of fins profiles?
Fin profiles are rectangular, convex, and exponential.
Where are annular fins used?
Annular fins are often used to increase the heat exchange in liquid–gas heat exchanger systems.
What are Heisler charts used for?
Heisler charts are a graphical analysis tool for the evaluation of one-dimensional transient conductive heat transfer in thermal engineering. They are a set of two charts per included geometry introduced in 1947 by M. P. Heisler which were supplemented by a third chart per geometry in 1961 by H. Gröber.
What is FinFin efficiency and why is it important?
Fin efficiency is the ratio of heat transfer from the actual fin to the heat transfer of an imaginary fin of the same geometry and same conditions but with an infinite conductivity (In other words, if the entire fin surface was in a temperature equal to that of the fin base).
How do you calculate the efficiency of a fin?
The fin efficiency is defined by the division of the actual by the theoretical heat transfer, that is, (9.35) η = ϕ actual ϕ theor = G θ t h A s θ t = G h A s. The actual heat flow through the fin is (9.36) ϕ actual = G θ t = h η A s θ t.
What is Fin efficiency in heat transfer?
Fin efficiency is the ratio of heat transfer from the actual fin to the heat transfer of an imaginary fin of the same geometry and same conditions but with an Introduction of Cooling Fins: Fins are the extended surfaces designed to Increase heat transfer rate for a fixed surface temperature, or lower surface temperature for…
How do you calculate the efficiency of a plate fin heat exchanger?
The overall fin efficiency η0 of a plate-fin heat exchanger is determined by Eq. (2.50): where A is the total heat transfer area, A = Ap + Af, Ap is the heat transfer area of the plates called as primary surface area, and Af is the extended surface area called as secondary surface area.