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Heat transfer Assignment 1. A plane wall is 150 mm thick and its wall area is 4.5m². Its thermal conductivity is 9.35 W/m°C and surface temperatures are steady at 1500°C and 450°C. Determine the heat flow across the plane wall 2. The following data relate to an oven. Thickness of side wall of the oven = 82.5 mm Thermal conductivity of wall insulation = 0.044 W/m°C Temperature on inside of the wall = 175° C Energy dissipated by the electrical coil within the oven = 40.5 W Determine the area of wall surface so that temperature on the other side of the wall does not exceed 75°C 3. The inner surface of a plane brick wall is at 50C and the outer surface is at 30°C. Calculate the rate thermal conductivity of the brick wall if the heat transfer per m² is 41.6 W/m². The thickness of the wall is 250 mm. 4. A hot plate 1m x 1.5 m is maintained at 300°C. Air at 20°C blows over the plate. If the convective heat transfer coefficient is 20 W/m² °C, calculate the rate of heat transfer 5. Determine the heat transfer by convection over a surface of 0.75 m² if the surface is at 200°C and the fluid is at 80°C. The value of the convective heat transfer coefficient is 25 W/m² °C

          Heat transfer Assignment
1. A plane wall is 150 mm thick and its wall area is 4.5m². Its thermal conductivity is 9.35 W/m°C and surface temperatures are steady at 1500°C and 450°C. Determine the heat flow across the plane wall

2. The following data relate to an oven.
Thickness of side wall of the oven = 82.5 mm
Thermal conductivity of wall insulation = 0.044 W/m°C
Temperature on inside of the wall = 175° C
Energy dissipated by the electrical coil within the oven = 40.5 W
Determine the area of wall surface so that temperature on the other side of the wall does not exceed 75°C

3. The inner surface of a plane brick wall is at 50C and the outer surface is at 30°C. Calculate the rate thermal conductivity of the brick wall if the heat transfer per m² is 41.6 W/m². The thickness of the wall is 250 mm.

4. A hot plate 1m x 1.5 m is maintained at 300°C. Air at 20°C blows over the plate. If the convective heat transfer coefficient is 20 W/m² °C, calculate the rate of heat transfer

5. Determine the heat transfer by convection over a surface of 0.75 m² if the surface is at 200°C and the fluid is at 80°C. The value of the convective heat transfer coefficient is 25 W/m² °C

Heat transfer Assignment
1. A plane wall is 150 mm thick and its wall area is 4.5m². Its thermal conductivity is 9.35 W/m°C and surface temperatures are steady at 1500°C and 450°C. Determine the heat flow across the plane wall

2. The following data relate to an oven.
Thickness of side wall of the oven = 82.5 mm
Thermal conductivity of wall insulation = 0.044 W/m°C
Temperature on inside of the wall = 175° C
Energy dissipated by the electrical coil within the oven = 40.5 W
Determine the area of wall surface so that temperature on the other side of the wall does not exceed 75°C

3. The inner surface of a plane brick wall is at 50C and the outer surface is at 30°C. Calculate the rate thermal conductivity of the brick wall if the heat transfer per m² is 41.6 W/m². The thickness of the wall is 250 mm.

4. A hot plate 1m x 1.5 m is maintained at 300°C. Air at 20°C blows over the plate. If the convective heat transfer coefficient is 20 W/m² °C, calculate the rate of heat transfer

5. Determine the heat transfer by convection over a surface of 0.75 m² if the surface is at 200°C and the fluid is at 80°C. The value of the convective heat transfer coefficient is 25 W/m² °C

Added by John M.

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