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A hot plate with a temperature of 60 ° C will be cooled by adding 50...

A hot plate with a temperature of 60 ° C will be cooled by adding 50 triangular profile needle blades (k = 243 W / mK) with a length of 93 mm and 10 mm. According to the ambient temperature 20 C and the heat transfer coefficient on the surface 20 W / m ^ 2 K; a-) Wing efficiency, b-) Total heat transfer rate (W) from the wings, c-) Calculate the effectiveness of a wing.

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