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Question:

Calculating the thermal resistance of a flat aluminum plate?

I am trying to calculate the thermal resistance of a flat aluminum plate of dimensions: 110x57.5x2.5 (mm)How should I go about and do it?I used the formula: thermal resistance thickness/(thermal conductivityxarea)With this i get a value of 0.001668°C/WIsnt it too small?I do a smilar calculation for a heat sink with parallel plate fins with the same dimensions and I get a higher thermal resistanceI get 4.5°C/W which is more realistic, therefore I think that I did a mistake in calculating the thermal resistance of the flat plate.Can anyone help me?

Answer:

Thermal resistance of a thin Al plate would be low, assuming you are measuring through the thicknessA heat sink would have a much higher value as the heat has to travel the length of the material, plus flow into the airActually, you probably don't have enough data to calculate this unless you take into account the shape of the fins, and the thermal resistance of the metal air interface.
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