The face temperatures of a flat wall are 650°C and 450°C respectively and the thermal conductivity of wall material is 0.30 kcal/m-hr-°C. For a wall thickness of 20 cm, the rate of heat conduction per square meter of wall area will be

Question

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The rate of heat conduction (Q) through a wall can be calculated using the formula Q = (kAΔT)/d, where k is the thermal conductivity, A is the area (which is 1 m² as per the question), ΔT is the temperature difference across the wall, and d is the thickness of the wall. Plugging in the values: k = 0.30 kcal/m-hr-°C, ΔT = 650°C - 450°C = 200°C, and d = 20 cm = 0.2 m, we get Q = (0.30 * 1 * 200) / 0.2 = 300 kcal/hr.

The Face Temperatures of a Flat Wall Are 650°C and 450°C