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QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house...
The wall of a house is 3 m high, 10 m long and 30 cm thick;...
The wall of a house is 3 m high, 10 m long and 30 cm thick; it has an effective thermal conductivity of 10 W/m K. The outer surface of the wall has an emissivity of 0.75. On a winter night, the outer surface of this wall is at a temperature of 0 °C and the air is at a temperature of –10 °C. The heat transfer coefficient for the outside wall is 8 W/m2 K. The outside wall also...
A concrete wall of a house is 45 cm thick and has a surface area 20m...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
Consider an ocean-facing room in a high-rise building (L/W of 1). The ocean-facing wall (with window) is...
Consider an ocean-facing room in a high-rise building (L/W of 1). The ocean-facing wall (with window) is 10m by 4 m, contains two windows (3m by 1m, each). Assume the room is located 30 m above the neutral pressure level and the inside air temperature is maintained at 24°C with RH of 50%. Outside air is of 35°C with RH of 60%. Assume the convective heat transfer coefficients on inner side and outer side of the wall and window are 0.5 and...
A 15 cm diameter, 2 cm thick sight glass installed in the wall of a glass...
A 15 cm diameter, 2 cm thick sight glass installed in the wall of a glass fired boiler allows the operator to observe conditions inside the boiler during operation. During normal boiler operation, the inside surface of the sight glass is 130C. Due to natural convection current in the warm boiler room, air at 35C flows vertically across the outside surface of the sight glass, giving the heat transfer coefficient of 25 ?/?2 ?. The sight glass is made of...
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is...
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is subjected to inside air at 22.C with a convection heat-transfer coefficient of 15 W/m2. C. The inner surface temperature of the wall is 18 C and the outside air temperature is -1 °C. Determine the outer surface temperature of the wall and the heat-transfer coefficient at the outer surface.
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 2...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
1. one wall is formed by two materials, the first one is 15cm thick and has...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
A plane wall is composed of two materials. Material A has a uniform heat generation of...
A plane wall is composed of two materials. Material A has a uniform heat generation of 100 kW/m3, a thermal conductivity of 50 W/mK, and a thickness of 10 cm. The inner surface of material A is well insulated. The other surface of material A is connected to Material B which has no generation with a thermal conductivity of 100 W/mK and a thickness of 20 cm. The outer surface of material B is cooled by ambient air at 300...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
[6] A 20-cm thick wall of a house made of brick (k = 0.72W/m. C) is subjected to inside air at 22.C with a convection heat-transfer coefficient of 15 W/m2. C. The inner surface temperature of the wall is 18 C and the outside air temperature is -1 °C. Determine the outer surface temperature of the wall and the heat-transfer coefficient at the outer surface.
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
Problem Wall with Strip Heater The air inside a chamber is measured to be 50C and used to convectively heat a wall (h 20 w/m2 K). The wall (thermal conductivity of 4 W/m K) is 200 mm thick and has a uniform heat generation of 1000 W/m2. To prevent any heat generated within the wall from being lost to the outside of the chamber a very thin electrical strip heater is placed on the outer wall to provide a uniform...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
A plane wall is composed of two materials. Material A has a uniform heat generation of 100 kW/m3, a thermal conductivity of 50 W/mK, and a thickness of 10 cm. The inner surface of material A is well insulated. The other surface of material A is connected to Material B which has no generation with a thermal conductivity of 100 W/mK and a thickness of 20 cm. The outer surface of material B is cooled by ambient air at 300...
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