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.
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A flat plate is maintained at 400 degrees C and it is well
insulated around 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.
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)....
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...
The front surface of the glass cover of a flat plate solar collector of dimensions 1...
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
Determine the overall heat transfer coefficient (UL) for a Flat Plate Solar Collector inclined at 45...
Determine the overall heat transfer coefficient (UL) for a Flat Plate Solar Collector inclined at 45 degrees to the horizontal and facing south. The average ambient temperature for the day is 20 degrees C and the observed glass and absorber plate temperatures are 45 degrees C and 69 degrees C respectively. The system is provided with 6 cm thick insulation (glass wool, k = 0.04 W/m degrees C) at the bottom. The air space between the absorber plate and glass...
Supplemental Problem 7.001 A flat plate of width 1 m is maintained at a uniform surface temperatu...
Supplemental Problem 7.001 A flat plate of width 1 m is maintained at a uniform surface temperature of Ts = 160°C by using independently of thickness a 12 mm and length b 50 mm. plate at a velocity of 30 m/s. The thermophysical properties of the module are k Reynolds number is 5x105 rectangular modules Each module is insulated from its neighbors, as well as on its back side. Atmospheric air at 25%C flows over the 5.2 w/m-K, cp320 J/kg...
A rod of 10-mm diameter and 250-mm length has one end maintained at 100°C
A rod of 10-mm diameter and 250-mm length has one end maintained at 100°C. The surface of the rod experiences free convection with the ambient air at 25°C and a convection coefficient that depends on the difference between the temperature of the surface and the ambient air. Specifically, the coefficient is prescribed by a correlation of the form, hfc = 2.89[0.6 +0.624(T - T∞)1/6]2, where the units are hfc (W/m².K) and T (K). The surface of the rod has an...
izon- e and sur- osed loss calm ffec- e the ce to 1-106 A nonmetal plate...
izon- e and sur- osed loss calm ffec- e the ce to 1-106 A nonmetal plate (k = 0.05 W/m.K) and an ASME SA-240 stainless steel plate (k = 15 W/m-K) are bolted together by ASTM B21 naval brass bolts. Both plates have a thickness of 38 mm, and the brass bolts are bolted through both plates. The bottom steel plate surface (surface 1) is subjected to a uniform heat flux of 200 W/m². The top non- metal plate surface...
Qi. A flat plate of width 1 m and length 0.2m is maintained at a temperature of 32°C. Ambient fluid at 22"C fBlows across the top of the plate in parallel flow. Determine the average heat tr...
Qi. A flat plate of width 1 m and length 0.2m is maintained at a temperature of 32°C. Ambient fluid at 22"C fBlows across the top of the plate in parallel flow. Determine the average heat transfer coefficient, the convection heat transfer rate from the top of the plate, and the drag force on the plate for the following: (a) The Buid is water flowing at a velocity of 0.5 m/s. o) Water is flowing at a velocity of 2.5...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
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.
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)....
The front surface of the glass cover of a flat plate solar collector of dimensions 1 m x 1 m has a temperature of 40°C. The collector loses heat by convection to atmospheric air at temperature 14°C. For a wind speed of 5 m/s blowing along and parallel to the glass cover, determine the rate of heat loss by convection. Calculate the net heat loss from the glass cover due to radiation exchange with blackbody surroundings at temperature 7°C if...
Supplemental Problem 7.001 A flat plate of width 1 m is maintained at a uniform surface temperature of Ts = 160°C by using independently of thickness a 12 mm and length b 50 mm. plate at a velocity of 30 m/s. The thermophysical properties of the module are k Reynolds number is 5x105 rectangular modules Each module is insulated from its neighbors, as well as on its back side. Atmospheric air at 25%C flows over the 5.2 w/m-K, cp320 J/kg...
izon- e and sur- osed loss calm ffec- e the ce to 1-106 A nonmetal plate (k = 0.05 W/m.K) and an ASME SA-240 stainless steel plate (k = 15 W/m-K) are bolted together by ASTM B21 naval brass bolts. Both plates have a thickness of 38 mm, and the brass bolts are bolted through both plates. The bottom steel plate surface (surface 1) is subjected to a uniform heat flux of 200 W/m². The top non- metal plate surface...
Qi. A flat plate of width 1 m and length 0.2m is maintained at a temperature of 32°C. Ambient fluid at 22"C fBlows across the top of the plate in parallel flow. Determine the average heat transfer coefficient, the convection heat transfer rate from the top of the plate, and the drag force on the plate for the following: (a) The Buid is water flowing at a velocity of 0.5 m/s. o) Water is flowing at a velocity of 2.5...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
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