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A coolbox in the shape of a cube is used to keep beverages cool, with each sidemeasuring 45 cm. Its walls are 3 cm thick and made of plastic(kplastic = 0.03 W.m-1.°C-1). Determine the heat flux through the walls of the coolbox ifthe difference between the outside and inside temperature is 20°C. |
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Answer» \(H=mL \) ∵ H = KA \((\frac{△t}{△x})t\) KA \((\frac{△t}{△x})+=ML \) 0.03 × 6 × (0.45)2 × \((\frac{20}{0.03})×3600=M×80×4.2×1000\) \(M=\frac{87480}{336000} \) \(M=0.26kg \) |
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