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A 5 m long x 1m wide horizontal plate is heated on top and insulated on...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate...
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
A 3 m high room with a 4 m x 4 m floor area is heated...
A 3 m high room with a 4 m x 4 m floor area is heated using electrical resistance heaters placed on the ceiling. The ceiling is maintained at 35oC and can be treated as a black body. The floor is at 15°C and has an emissivity of 0.8. The side walls of the room are well insulated. Neglecting heat transfer by convection, find the rate of heat loss from the room through the floor Ceiling: 1 4 m x...
An aluminum plate with a thickness of L=5 mm is mounted in a horizontal position, and...
An aluminum plate with a thickness of L=5 mm is mounted in a horizontal position, and its bottom surface is well insulated. A special, thin coating (with emissivity and solar absorptivity of 0.25) is applied to the top surface. The density ρ and specific heat c of aluminum are known to be 2700 kg/m3 and 900 J/kg · K, respectively. Consider conditions for which the plate is initially at a temperature of ??????=25 °C and its top surface is suddenly...
2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m...
2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m wide is maintained at a constant temperature of 100°C. Cooling water at a temperature of 24°C flows over the top of the plate at 15 cm/s. Assume the bottom of the plate is adiabatic. a. Determine the heat transfer rate from the plate. b. A trip wire is placed at the leading edge of the plate, tripping the flow to turbulent. Determine the heat...
Problem 2 (50 Points A flat, isothermal vertical heating panel, 0.5 m wide by 1 m...
Problem 2 (50 Points A flat, isothermal vertical heating panel, 0.5 m wide by 1 m high is mounted inside a large room. The surface of the panel has an emissivity of 0.90 and is maintained at 400 K If the walls and air of the room are at 300 K, calculate: a) The Rayleigh number of the free convection boundary layer. b) Selecting a suitable equation for Nusselt number, calculate the heat transfer coefficient of the flow c) The...
A flat plate is maintained at 400 degrees C and it is well insulated around the...
A flat plate is maintained at 400 degrees C and it is well insulated around the sides and bottom. The plate experiences 800 w/m^2 of irradiation from its surroundings. The surrounding air is at 40 degrees C. The surrounding 40C air provides a convection coefficient of 15 w/m^2K. The plate surface has an emissivity of 0.9 and an absorptivity (for all irradiation) of 0.7. What is the net heat transfer.
A wall panel is insulated on the back and exposed to solar radiation on the front...
A wall panel is insulated on the back and exposed to solar radiation on the front surface. The exposed surface of the plate has an absorptivity α = 0.8 for radiation (i.e. 80% of radiant energy is absorbed). Solar radiation arrives to the panel at a rate of 1 kW⁄m2. The panel emissivity ϵ = 1 and the surrounding air temperature is 25°C. a. If we assume radiation is the only mechanism of heat transfer, in this scenario determine the...
A room 4m x 4m x 4m is heated through the floor by maintaining it at...
A room 4m x 4m x 4m is heated through the floor by maintaining it at 350K, while the side walls are insulated. The heat loss takes place through the ceiling at 300K. Assuming that all surfaces have an emissivity of 0.8, determine the heat loss by radiation through the ceiling.
Surface 1 is long heated plate running through a large room. This plate is 0.3 m...
Surface 1 is long heated plate running through a large room. This plate is 0.3 m high, &q=0.8 for its surface, and its surface temperature is T = 500 K. Surface 2 is a long cooled plate that is parallel to the heated plate and positioned 0.4 m away from the heated plate. This plate is also 0.3 m high, &, = 0.8 for its surface, and its surface temperature is T, = 250 K. Surface 3 is the room...
The lower surface of a horizontal aluminum plate 5 in. by 7 in. is heated by...
The lower surface of a horizontal aluminum plate 5 in. by 7 in. is heated by an electric resistance heater that supplies 10 W. The upper surface is cooled by free convection and radiation. The convective transfer coefficient is 1.2 Btu/hr ft2 °F and the air temperature is 70 °F. Surrounding room surfaces are also at 70 °F. Find the surface temperature of the aluminum if it is a) clean and shiny with ε=0.05 b) painted with ε=0.9
Homework 7 heat transfer 2018-20 1) A horizontal tube of 12.5-mm dimeter with an outer srface temperature of 240°C is placed in a room with an air temperature of 20°C. Estimate the heat transfer rate per unit length of the tube due to free convection. 2) Air at -10°C flows at 10 m/s over the roof plate of two 5m length rooms whose air is at Too-200C. The roof plate is 0.20-m thick concrete (k = 0.6 w/ m. K)....
A 3 m high room with a 4 m x 4 m floor area is heated using electrical resistance heaters placed on the ceiling. The ceiling is maintained at 35oC and can be treated as a black body. The floor is at 15°C and has an emissivity of 0.8. The side walls of the room are well insulated. Neglecting heat transfer by convection, find the rate of heat loss from the room through the floor Ceiling: 1 4 m x...
2. A heated flat plate 1.0 m long (in the direction of flow) and 0.5 m wide is maintained at a constant temperature of 100°C. Cooling water at a temperature of 24°C flows over the top of the plate at 15 cm/s. Assume the bottom of the plate is adiabatic. a. Determine the heat transfer rate from the plate. b. A trip wire is placed at the leading edge of the plate, tripping the flow to turbulent. Determine the heat...
Problem 2 (50 Points A flat, isothermal vertical heating panel, 0.5 m wide by 1 m high is mounted inside a large room. The surface of the panel has an emissivity of 0.90 and is maintained at 400 K If the walls and air of the room are at 300 K, calculate: a) The Rayleigh number of the free convection boundary layer. b) Selecting a suitable equation for Nusselt number, calculate the heat transfer coefficient of the flow c) The...
Surface 1 is long heated plate running through a large room. This plate is 0.3 m high, &q=0.8 for its surface, and its surface temperature is T = 500 K. Surface 2 is a long cooled plate that is parallel to the heated plate and positioned 0.4 m away from the heated plate. This plate is also 0.3 m high, &, = 0.8 for its surface, and its surface temperature is T, = 250 K. Surface 3 is the room...
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