Fin efficiency

	Heat dissipation and efficiency for fins
Related links Heat transfer coefficient for parallel plates Thermal design for electronics Thermal online tools Unit conversion Comments Your need to install a Java console to display this applet. All modern browsers have this option. General The heat dissipation is calculated for a single fin, two sides. For the centered pipe cases, the contribution from the pipe is not included. The fin efficiency is calculated approximately for the centered pipe cases. The relative error increases with decreasing efficiency. At 40% it is ~5% and for lower efficiencies the error increases dramatically. Values below 40% are market as a red line. Clarifications Pipe correction. Air flow disturbances caused by the pipe increases the heat transfer coefficient. This box should normally be checked. Its premiere purpose is to enable checks of the order of this impact. h0. Is the heat transfer coefficient defined for the inlet air temperature difference on an isothermal plate. hm. Is the heat transfer coefficient defined for the logarithmic mean temperature difference. Save last/Delete last. Saves or deletes the last curve in the diagram. Maximum capacity is 5 curves. Natural convection Use the Natural Convection for Parallel Plates calculator to get the equivalent velocity. Top of page

Heat dissipation and efficiency for fins

Your need to install a Java console to display this applet. All modern browsers have this option.

General

The heat dissipation is calculated for a single fin, two sides. For the centered pipe cases, the contribution from the pipe is not included.

The fin efficiency is calculated approximately for the centered pipe cases. The relative error increases with decreasing efficiency. At 40% it is ~5% and for lower efficiencies the error increases dramatically. Values below 40% are market as a red line.

Clarifications

Pipe correction. Air flow disturbances caused by the pipe increases the heat transfer coefficient. This box should normally be checked. Its premiere purpose is to enable checks of the order of this impact.

h0. Is the heat transfer coefficient defined for the inlet air temperature difference on an isothermal plate.

hm. Is the heat transfer coefficient defined for the logarithmic mean temperature difference.

Save last/Delete last. Saves or deletes the last curve in the diagram. Maximum capacity is 5 curves.

Natural convection

Use the Natural Convection for Parallel Plates calculator to get the equivalent velocity.

Top of page