A vertical plate 7.5 ft. high and 9 ft. wide at 125 F is exposed to nitrogen at 75 F. Determine the convection heat tran...
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A vertical plate 7.5 ft. high and 9 ft. wide at 125 F is exposed to nitrogen at 75 F. Determine the convection heat tran...
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still...
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still air at 30°C. When smaller side of the plate is held vertical, the convection heat transfer rate is 14% higher than that when bigger side of the plate, held vertical. Determine the dimensions of the plate. Neglecting the internal temperature gradients of the plate. Also calculate the heat transfer rate in both cases. Use relation Nul-0.59(Gr P)4 ULO 3-I)
Estimate the rate of heat loss from a vertical thin plate immersed in CO2 at one...
Estimate the rate of heat loss from a vertical thin plate immersed in CO2 at one atmosphere and 10℃. The plate is 4 m high and 3 m wide. It is maintained at 44℃.
Superimposed free convection over forced convection will yield higher heat trans- fer coefficients for: (a) gas...
Superimposed free convection over forced convection will yield higher heat trans- fer coefficients for: (a) gas heating in a horizontal tube (b)iquid cooling in a horizontal tube (c) liquid heating in a vertical tube with upflow (d) gas cooling in a vertical tube with downflow 7.38 7.39 The free convection effect in a forced flow may be significant for (a) small (T T (c) shell-and-tube exchanger (b) highly compact exchanger (d) high Reynolds number 7.35 Compared to the constant-viscosity case,...
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
Estimate the rate of heat loss from a vertical thin plate immersed in Carbon Dioxide (CO2)...
Estimate the rate of heat loss from a vertical thin plate immersed in Carbon Dioxide (CO2) at one atmosphere and 10°C. The plate is 4 m high and 3 m wide. It is maintained at 44°C.
2. (60 pts) Estimate the rate of heat loss from a vertical thin plate immersed in...
2. (60 pts) Estimate the rate of heat loss from a vertical thin plate immersed in Carbon Dioxide (CO2) at one atmosphere and 10°C. The plate is 4 m high and 3 m wide. It is maintained at 44°C.
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
Consider a 4 m high, 6 m wide and 0.17 m thick wall whose thermal conductivity is k = 0.8 W/m.oC....
Consider a 4 m high, 6 m wide and 0.17 m thick wall whose thermal conductivity is k = 0.8 W/m.oC. On a certain day, the temperatures of the inner and the outer medium close to the wall are measured to be 14oC and 6oC, respectively. Both inner and outer surfaces are subjected to convection heat transfer. Assume that the convection heat transfer coefficient is the same for the two surfaces h = 5 W/m2 ∙ °C. 1. Draw the...
9-22 A 0.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while...
9-22 A 0.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The plate surface has an emissivity of 0.73, and its midpoint temperature is 55°C. Determine the heat flux sub- jected on the plate surface.
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from...
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still air at 30°C. When smaller side of the plate is held vertical, the convection heat transfer rate is 14% higher than that when bigger side of the plate, held vertical. Determine the dimensions of the plate. Neglecting the internal temperature gradients of the plate. Also calculate the heat transfer rate in both cases. Use relation Nul-0.59(Gr P)4 ULO 3-I)
Superimposed free convection over forced convection will yield higher heat trans- fer coefficients for: (a) gas heating in a horizontal tube (b)iquid cooling in a horizontal tube (c) liquid heating in a vertical tube with upflow (d) gas cooling in a vertical tube with downflow 7.38 7.39 The free convection effect in a forced flow may be significant for (a) small (T T (c) shell-and-tube exchanger (b) highly compact exchanger (d) high Reynolds number 7.35 Compared to the constant-viscosity case,...
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
Estimate the rate of heat loss from a vertical thin plate immersed in Carbon Dioxide (CO2) at one atmosphere and 10°C. The plate is 4 m high and 3 m wide. It is maintained at 44°C.
2. (60 pts) Estimate the rate of heat loss from a vertical thin plate immersed in Carbon Dioxide (CO2) at one atmosphere and 10°C. The plate is 4 m high and 3 m wide. It is maintained at 44°C.
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
9-22 A 0.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The plate surface has an emissivity of 0.73, and its midpoint temperature is 55°C. Determine the heat flux sub- jected on the plate surface.
please show me how I can finds the answers of these two
examples
Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
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