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Heat Analysis
Heat q flows out of the enclosure three different ways: the sides, the top and the bottom. The heat flows out of the enclosure first by conducting through the walls and then by convection into the surrounding air. The conduction resistance depends on the thickness of the walls and the material. The convection resistance is determined using curve fits of dimensionless parameters. It is assumed that there are feet on the bottom of the enclosure so that convection can occur their. All of this was used to determine the surface temperatures of the enclosure.
The relations for convection are complicated enough that they require one to goal seek on the temperatures. For each means of heat leaving (side, top and bottom) the spreadsheet calculates the heat going out due to convection and the total heat (convection + conduction). These values should be the same because heat that leaves through one route by convection must also have conducted and convected out that route. The spreadsheet then varies the surface temperatures until this is the case through use of Excels solver.
The following results were obtained by changing the power dissipated q. The side and bottom temperature are very similar this may be due to them both being steel whereas the top is plastic.
The Excel file used for making these calculations in on the senior design website. The main values on interest on it are the power dissipated and air temp in the input section along with the outer wall temperatures in the final value section. If one wants to change the input values one needs to then run the Excel solver to calculate the temperatures. If the Excel solver is successful then the value labeled Goal Seek on the spreadsheet should be approximately zero. If it is unsuccessful one can try manually changing out outer wall temperature values and running the solver again.
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