Composit wall K1=10.K2=30,K3=40 W/mC at sieries repectivelly.Thickness for al three layer are 0.2m.From the left side hot air at 150 C ,h=12 W/m²C, while on the left side, surface temperature 30C.Calculate all interace temperatures and cold air temperatures.
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- A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.Composit Wall K₁= 20, K₂=30₂ K3=40 w/mc at Steries re Pectivelly Thickness for at three layer are 0.2m. from the right Side hot air 150 C , h = 12 w/mc while on the left Side, Surface temperature 20 c°. Calculate all interace temperatures and Cold air temperatures-Example2:Thickness of plate (6mm) .Thermal conductivity (20W/m.°C) ,heat generation (3x10'W/m) .heat thermal coefficient between plate surface and fluid supplied (4000W/m?.°C ,3158 W/m?.°C) respectively and fluid temperature (120°C,140°C) respectively .Calculate left and right sides surfaces .If max temperature lies on (2mm) from the side that fluid temperature is (140°C) .so Calculate max temperature can the plate reached to it.
- A plate is maintained at 74°C and this surface is facin an air having temperature of 30°C, then what will be th value of coefficient of volumetric expansion ß?Composit Wall K₁ = 20, K₂=30₂ K3=40 w/mc at Steries repectively Thickness for at three layer are 0.2m. from the right side hot air 150c, h = 12 w/mc while on the left Side, Surface temperature 20 c°. Calculate all interace temperatures and Cold air temperatures-A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.What is the radiation heat transfer %D rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s) %3D Select one: A. 4493.18 B. 5182.0 C. 4818.4 D. 5532.2 E. 4093.0
- The rear window of an automobile is defogged by passing warm air over its inner surface. If the warm air is at Ti = 40°C and the = 30 W/m2-K, what are the inner and outer surface temperatures, in °C, of 4-mm-thick corresponding convection coefficient is h; window glass, if the outside ambient air temperature is To = -15°C and the associated convection coefficient is h, = 65 W/m²-K? o,0 Evaluate the properties of the glass at 300 K. Tsi i °C Ts,0 i °Cplz answer this,ASAP,thx At high temperatures a nuclear reactor consists of a cylindrical wall composite as the fuel element thorium (k = 57 W/mK) wrapped in graphite (k = 3 W/mK) and helium gas flows through a circular cooling channel. Cylinder length 200 mm. Taking into account the helium temperature = 600°C and the convection coefficient, h= 200 W/m²K. When measured, the outside temperature is 100°C, and h = 5 W/m².K. Draw the electrical analogy, and calculate the overall heat transfer rate!Example 1.4 length. It is lined inside with 3 cm of insulating material of k = 0.042 W/mK. It is flying at a height where the average outside temperature is - 30°C. To find: The rate of heating required to maintain the compartment at 20°C for passenger comfort. Given: A jet aircraft compartment is assumed to be a cylindrical tube of 3-m diameter and 20-m
- Brass cube "p = 8530 kg/m , c_= 380 J/kg.°C, k= 110 W/m.°C, a = 33.9E-6 W/m.°C", side length =9 mm, are annealed by heating them first to 929°C in a furnace and then allowing them to cool slowly to 130°C in ambient air at 28°C. If the average heat transfer coefficient is 17.3 W/m .°C, how long will the annealing process will (seconds)?Q2/ A hot surface at 100 C is to be cooled by attaching 27778 copper fins (k=237 w/m.K), 3 cm long for each fin, 0.25 cm dia. to it. Temp. of surrounding air is 30 C and h=35 w/m2.K on the surface. Calculate the heat rate from the surface for a 1m X im section of the plate. Also, determine the effectiveness of the fins.A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at %3D 0°C.What is the convection heat transfer rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s ) %3D Select one: A. 1911.1 В. 1419.1 C. 1673.5 D. 1149.6 E. 924.31