Homework Answers
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...
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...
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.
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)...
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)...
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...
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...
P2 (50 pts.) Assume the roof of a room in a typical house is 12 cm...
P2 (50 pts.) Assume the roof of a room in a typical house is 12 cm thick concrete slab with a thermal conductivity k = 1.50 W/m•°C. The roof of the room is 4 m wide and 4 m long. Assume convection heat transfer coefficients on the inner and outer surfaces of the roof are hi=6 and ho=10 W/m2°C, respectively. At noon, when the sun is "hotter" the solar irradiation is estimated to be color = 750 W/m- and the...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting o...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
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...
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...
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.
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)...
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...
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...
P2 (50 pts.) Assume the roof of a room in a typical house is 12 cm thick concrete slab with a thermal conductivity k = 1.50 W/m•°C. The roof of the room is 4 m wide and 4 m long. Assume convection heat transfer coefficients on the inner and outer surfaces of the roof are hi=6 and ho=10 W/m2°C, respectively. At noon, when the sun is "hotter" the solar irradiation is estimated to be color = 750 W/m- and the...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
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