If the emitted radiant energy is to be doubled, determine the shrface temperature of black body in lem density as 11631.7 W/m (o-5.67x108 WM²K) and find the results upto oner imal point
Q: (2) juhäi The heat is dissipated from the plate by convection and radiation into surrounds at 20 C.…
A: We are restricted to solve one question at a time. Please ask other questions in the next post.…
Q: emissivity of 0.85. Determine the net rate of radiation heat transfers between the two surfaces, and…
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Q: The heat is dissipated from the plate by convection and radiation into surrounds at 20 C . Take ɛ…
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Q: The monochro matie emissivit of a surface varies wi th wavelength in the following en=0, ^1um…
A: Given: Monochromatic Emmissivity (ε)ελ=0, λ<0.3µmελ=0.9, 0.3µm≤λ≤1µmελ=0, λ>1µm Surface…
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A: Write the given data:
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Q: A 5-in-diameter spherical ball is known to emit radiation at a rate of 550 Btu/h when its surface…
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Q: Consider steady heat transfer between two large parallel plates at constant temperatures of T1=300 K…
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Q: Calculate the amount of radiation emitted for a unit surface (1 m2 ) forthe following situations:…
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Q: Solar radiation is incident on the glass cover of asolar collector at a rate of 700 W/m2. The glass…
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Q: A black body of finite dimension at 1000 K is inserted into an infinite medium at 300 K. Given…
A: Given Data : Surface Temperature : T1=300 KT2=1000 K Stefan Boltzmann constant : σ=1.8×10-8Wm2-K4
Q: Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 300…
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Q: ugh its interior. A radiation shieldi nd the tube, providing an air gap reen the tube and the…
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Q: In the summer, parked automobile surfaces frequently average 104 °F to 50°C and surface emissivity…
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Q: Consider a person standing in a room. The inner surfaces of the walls, floors, and ceiling of the…
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Q: Solar radiation is incident on the front surface of athin plate with direct and diffuse components…
A: The direct component of incident solar radiation, Gdirect = 300 W/m2 The diffused component of solar…
Q: Two very large walls are at constant temperature of 463oF and 887 oF. Assuming that the walls behave…
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Q: Consider a thin suspended hotplate that measures 0.25 mx 0.25 m. The isothermal plate has a mass of…
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Q: A certain 1m body at 20 C is display on a top of a building during the night. the body sees nothing…
A: Given data , e= 0.9 Temperature to be maintained is T= 23°C= 296 K T1=110 K t= 20°C
Q: Assuming the sun to be a black body emitting radiation with maximum intensity at 1 = 0.48u m,…
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Q: An automotive engine can be approximated asa 0.4-m-high, 0.60-m-wide, and 0.7-m-long…
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Q: What is the heạt transfer coefficient for radiation (W/m -K) for the case of 2.5mm wire and length…
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Q: The primary driving force for natural convection is O a. pressure forces O b. shear stress forces O…
A: Generally we know, The primary driving force for natural convection is buoyancy forces.
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Q: 1.24 Asphalt pavements on hot summer days exhibit surface tempera- tures of approximately 50 C.…
A: Given Temperature, T = 50oC = 323 K Boltzman constant = 5.67 x 10-8 W/m2 K4
Q: (a) A small body with temperature T and emissivity e is placed in a large evacuated cavity with…
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Q: A 1.2 m wide and 5.1 m long solar collector is mounted to a roof. Now the average surface…
A: Given width of solar collector w=1.2 m Length of solar collector l=5.1 m Average surface temperature…
Q: Two parallel plates are sustained at 1073.15K and 573.15K which has emissivity of 0.3 and 0.5…
A: Given:T1=1073.15 KT2=573.15 Kε1=0.3ε2=0.5ε=0.05
Q: Consider a person standing in a breezy room at 24C. Determine the total rate of heat transfer from…
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Q: Two concentric spheres of diameters D1 = 15 cm and D2 = 25 cm are separated by air at 1 atm…
A: Given data: Diameter of inner sphere, D1= 15 cm Diameter of outer sphere, D2 = 25 cm Pressure of…
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Q: Question # 3: Water is boiling in a 12-cm-deep pan with an outer diameter of 25 cm that is placed on…
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Q: Two parallel rectangular black plates 0.5 m by 2.0 m are spaced 1.0 m apart. One plate is maintained…
A: Given data: The area of rectangular plate is A=0.5×2=1 m2 The space between the plate is d=1 m The…
Q: In the summer, parked automobile surfaces frequently average 104 °F to 50°C and surface emissivity…
A: Calculated the radiant thermal heat flux emitted by the car roof.
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A: Let us represent, Reflectivity = ρ Transmissivity = τ Emissivity = α From the data given in…
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Q: A 2-m-internal-diameter double-walled spherical tank is used to store iced water at 0°C. Each wall…
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Q: Consider a person standing in a room maintained at20°C at all times. The inner surfaces of the…
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Q: Question 4:Consider a person standing in a room maintained at20°C at all times. The inner surfaces…
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Q: Receiver made of copper in solar dish experiment because.1 (äbäi 1) cheaper O shining metal O good…
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Q: Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.7, and surface temperature…
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Q: I- A o.2 m thick infinite black plate havingg of a theranal conductivi ty 3.96 W/m K is exposs e to…
A: Given:Thermal conductivity of the plate, K=3.96 W/m.Ktemperature of the plate facing cold side,…
Q: (B) Two parallel plates (1mx0.5m) are maintained at uniform temperatures of T₁ = 1000K and T₂ = 500K…
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- 1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.8.15 A mercury bath at is to be heated by immersing cylindrical electric heating rods, each 20 cm tall and 2 cm in diameter. Calculate the maximum electric power rating of a typical rod if its maximum surface temperature is .Three thin sheets of polished aluminum are placed parallel to each other so that the distance between them is very small compared to the size of the sheets. If one of the outer sheets is at 280C and the other outer sheet is at 60C, calculate the temperature of the intermediate sheet and the net rate of heat flow by radiation. Convection can be ignored.
- Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.1.13 If the outer air temperature in Problem is –2°C, calculate the convection heat transfer coefficient between the outer surface of the window and the air, assuming radiation is negligible.
- Explain the following terms related to the radiation mode of heat transfer: Black body, emissive power, monochromatic emissive power, gray body, white body and opaque body.14. A 39-cm diameter sphere at a constant uniform temperature of 84°C is inside a room at a room temperature of 31°C. If the surface emissivity of the sphere is 0.87, what is the radiation heat transfer from the sphere to the room? Express your answer in W.Consider a three-square-foot black body plane surface at a temperature of 76°F,calculate the heat transfer by radiation to the surface from another three-squarefoot black body plane directly above and parallel to the first at temperatures of1510°F.A. 76,431 Btu/hr B. 76,631 Btu/hrC. 76,831 Btu/hr D. 76,931 Btu/hr
- Calculate the ratio of the radiant energy emitted from a surface at 37ºC and an adjacent surface of equal area and emissivity at 35ºC.Heat radiates from a small sphere suspended in a large room. The surfaceof the sphere of 1.5 sq. Ft. is at a temperature of 580 °F, and the insidesurfaces of the room are at a temperature of 80 °F. Assuming the emissivity ofthe sphere surface to be 0.30, calculate the radian-heat transfer in BTU/hr.Calculate the amount of radiation emitted for a unit surface (1 m2 ) forthe following situations: (a) a hot pavement in Arizona at 50° C and ε ≈ 0.8, (b) a hood of a car at 40° C and ε ≈ 0.9, and (c) a sunbather at 38° C and ε ≈ 0.9. Express your answers in both SI and U.S. Customary units.