Homework Answers
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.
3 4. (30 pts) radiation; a cubical room 3 mx 3 mx 3 m is heated...
3 4. (30 pts) radiation; a cubical room 3 mx 3 mx 3 m is heated through the floor by maintaining it at a uniform temperature of 310K. Since the side walls are well insulated, the heat loss through them can be considered negligible. The heat loss takes place through the ceiling, which is maintained at 280K. All surfaces have an emissivity & =0.85. Answer each following question: Long #2 (50 min) ceiling Az = 9 м2 Tz = 280k...
A 5 m long x 1m wide horizontal plate is heated on top and insulated on...
A 5 m long x 1m wide horizontal plate is heated on top and insulated on the bottom. The plate is maintained at 200 C. The air and walls of the room are maintaine d at 25°C. Determine the heat transfer by nature convection and radiation heat transfer. Assume an emissivity of 0.8.
Problem III - Solve on Booklet 3 (33 pts) Consider two parallel, aligned disks, 0.4 m...
Problem III - Solve on Booklet 3 (33 pts) Consider two parallel, aligned disks, 0.4 m in diameter and separated by 0.1 m. The first disk (A1), with an emissivity of 0.6, is maintained at a uniform temperature of 500 K. The second disk (A2), with an emissivity of 0.8, has a well-insulated back side while its front side faces the first disk. The two parallel disks are located in a large room (A3) whose walls are maintained at 300...
2. A room that is 24 ft wide, 24 ft long, and 10 ft high has...
2. A room that is 24 ft wide, 24 ft long, and 10 ft high has its floor and ceiling temperatures maintained at 85°F and 65°F, respectively. If the walls are assumed to be nonconducting but reradiating, determine the net heat transfer between the floor and ceiling in units of Btu/h. All surfaces may be considered to have an emissivity of 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...
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)....
Done Expert Q&A Consider the perpendicular rectangles shows ieally. -04 0 03 -0.2m r-0.5m Determine the shape factor F 02 A drying oven consists of a long semicincular dact of diameter D 1m....
Done Expert Q&A Consider the perpendicular rectangles shows ieally. -04 0 03 -0.2m r-0.5m Determine the shape factor F 02 A drying oven consists of a long semicincular dact of diameter D 1m. T-1200 -325K D-1 Materials to be dried cover the base of the oven while the wall is maintained at 1200 K. What is the drying rate per unit length of the oven Okpls-m) if a water coted layer of material is maintained at 323 K doring the...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatu...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
Problem 7: A special surface coating on a square panel that is 5m x5 m on...
Problem 7: A special surface coating on a square panel that is 5m x5 m on a side is cured by placing the panel directly under a radiant heat source having the same dimensions. The heat source is diffuse and gray and operates with a power input of 75 kW. The top surface of the heater, as well as the bottom surface of the panel, may be assumed to be well insulated, and the arrangement exists in a large room...
3 4. (30 pts) radiation; a cubical room 3 mx 3 mx 3 m is heated through the floor by maintaining it at a uniform temperature of 310K. Since the side walls are well insulated, the heat loss through them can be considered negligible. The heat loss takes place through the ceiling, which is maintained at 280K. All surfaces have an emissivity & =0.85. Answer each following question: Long #2 (50 min) ceiling Az = 9 м2 Tz = 280k...
A 5 m long x 1m wide horizontal plate is heated on top and insulated on the bottom. The plate is maintained at 200 C. The air and walls of the room are maintaine d at 25°C. Determine the heat transfer by nature convection and radiation heat transfer. Assume an emissivity of 0.8.
Problem III - Solve on Booklet 3 (33 pts) Consider two parallel, aligned disks, 0.4 m in diameter and separated by 0.1 m. The first disk (A1), with an emissivity of 0.6, is maintained at a uniform temperature of 500 K. The second disk (A2), with an emissivity of 0.8, has a well-insulated back side while its front side faces the first disk. The two parallel disks are located in a large room (A3) whose walls are maintained at 300...
2. A room that is 24 ft wide, 24 ft long, and 10 ft high has its floor and ceiling temperatures maintained at 85°F and 65°F, respectively. If the walls are assumed to be nonconducting but reradiating, determine the net heat transfer between the floor and ceiling in units of Btu/h. All surfaces may be considered to have an emissivity of 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)....
Done Expert Q&A Consider the perpendicular rectangles shows ieally. -04 0 03 -0.2m r-0.5m Determine the shape factor F 02 A drying oven consists of a long semicincular dact of diameter D 1m. T-1200 -325K D-1 Materials to be dried cover the base of the oven while the wall is maintained at 1200 K. What is the drying rate per unit length of the oven Okpls-m) if a water coted layer of material is maintained at 323 K doring the...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
Problem 7: A special surface coating on a square panel that is 5m x5 m on a side is cured by placing the panel directly under a radiant heat source having the same dimensions. The heat source is diffuse and gray and operates with a power input of 75 kW. The top surface of the heater, as well as the bottom surface of the panel, may be assumed to be well insulated, and the arrangement exists in a large room...
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