Fin Thermal Resistance Calculator


A javascript calculator for determining the thermal resistance for a fin of uniform cross section with convective cooling he at the tip and a contact conductance hc at the base.

All calculations performed using the following expression for the thermal resistance for fins and extended surfaces:

where:

and:

Instructions
  1. Enter input values in the left table
  2. Browser will re-calculate when a change is made and the mouse is clicked in another box, the Tab key is pushed (Enter key for Unix), or the Calculate button is clicked.


Input Values
Fin Length
(mm)		 L
Fin Cross Sectional Area
(mm2) 		A
Fin Perimeter
(mm) 		P
Fin Thermal Conductivity
(W/mK)		 k
Base Contact Conductance
(W/m2K) 		hc
Fin Convection Coefficient
(W/m2K) 		h
Fin Tip Convection
Coefficient
(W/m2K) 		he

Number of Digits

Results
Fin Tip Biot Number Bie
Base Biot Number Bic
Fin Biot Number Bi
Fin Parameter m L
Fin Thermal Resistance
( oC/W)		 Rfin


Copyright 1997, Microelectronics Heat Transfer Laboratory