![]() In most situations the internal air temperature will be lower than the component temperatures. Since our simplified analysis allows us to estimate the internal air temperature only we will use that value to calculate R radi. The radiation heat transfer from the heat generating components to the internal walls of the enclosure is represented by R radi. Radiation can account for a significant percentage of the heat transfer in situations involving natural convection as is the case with a sealed enclosure. For most electronic applications the flow within the enclosure will be laminar. The equations used to calculate the thermal resistance associated with the convective heat transfer from the air inside the enclosure to the walls of the enclosure are as follows:Īverage air temperature inside the enclosureĪverage enclosure internal wall surface temperatureĬonvection to Internal Vertical Surfaces 7Įquations 3,6 and 8 are developed in and are only applicable with air as the flow medium and laminar flow. Correlations used to calculate the heat transfer from horizontal and vertical plates will be used to estimate the heat transfer from the top/bottom surface and vertical surfaces respectively. If there are no fans or other type of forced convection within the enclosure the heat transfer from the internal air to the walls is via natural convection.
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