Com Posit Wall K₁=20₂ K₂=30 K3=40 w/mc at Steries repectively Thickness for at three layer are 0.2m. from the right Side hot air 150 C ₂ h = 12 w/m²c while on the left Side, Surface temperatur 20c°. Calculate all interace temperatures and cold air temperatures -
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- An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a resistance of 310-4 ohm per meter of length. If the air around this line is at v, determine the surface temperature on a windy day, assuming a wind blows across the line at 33 km/h.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-A circular plate of diameter (2.20 m) is placed some how 1.5 meter above the room floor, if the Raleigh number can be approximated by Ra=7.653E7*D and temperature difference between surface and room air temperature is 73 C, air properties: k= 0.0372 W/m.K, Pr = 0.686.What is the initial rate of cooling by convection from the Upper surface ONLY (Watts)?
- A circular plate of diameter (0.74 m) is placed some how 1.5 mețer above the room floor, if the Raleigh number can be approximated by Ra= 7.653E7 D and temperature difference between surface and room air temperature is 73 C, air properties: k= 0.0372 W/m.K, Pr=0.686. What is the initial rate of cooling by convection (kJ/s) from the Lower surface ONLY (Watts)? Select one: O A. 148.40 O B. 45.93 O C 297.52 O D. 219.07 O E 70.67A 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?A circular plate of diameter (1.36 m) is placed some how 1.5 meter above the room floor, if the Raleigh number approximated by Ra=7.653E7*D° and temperature difference between surface and room air temperature is 73 C, air properties: k = 0.0372 W/m.K, Pr = 0.686 . What is the initial rate of cooling by convection from the Upper surface ONLY (Watts)? be can Select one: A. 1004.31 B. 1387.95 C. 1134.87 D. 1263.42 E. 368.99
- 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.To avoid overheating, natural convection analysis is to beconsidered. If the minimum allowable heat transfer due tonatural convection is 30 W, find the maximum angle at whichthe TV can hang off the wall (0 < θ < 60). Some temperatureswere collected; Back panel surface: 45 °C, ambient: 32 °C. A typical 55-inch TV screen measures (122 cm x 69 cm). please answer and show all detailed calculationsA stove in the form of a cube (L = 1m)it is located inside. External walls of the stove,according to the spreading ratio ε = 0.8 and TS,S = 500Kit has a temperature of. Stove pipe DP = 25 cmin diameter, LP = 2 m long and TS,P = 400Kit is at surface temperature. Inside the stovesurfaces and interior environment of the large room where it is locatedits air temperature is T∞ = Tsur = 300K. The Pipeheat transfer from the horizontal transition part and through the pipeneglecting the radiation between the stove, decoupage of the stove andfind the heat flux passing through the pipe to the environment.
- H.W. Q1: Consider a hot automotive engine, which can be approximated as 0.40m wide, and 0.8m long rectangular block. The bottom surface of the block is at a temperature of 80°C and has an emissivity of 0.95. The ambient air is at 20°C, and the road surface is at 25°C. Determine the rate of heat transfer from the bottom surface of the engine block by convection and radiation as the car travels at a velocity of 80 km/h. Assume, the flow to be turbulent over the entire surface because of the constant agitation of the engine block. k = 0.02735 W/m.°C v=1.798×10* m²/s Air properties at Tf= 50 °C: Pr = 0.7228 Answer: Qcony = 1363 W, Qrad = 132 W, Qotal = 1495 w Hint: Use the correlations (equations) of average Reynold number (ReL). L = 0.8 m Engine block Air V, = 80 km/h T. = 20°C T; = 80°C ɛ = 0.95A:Find the amount of heat transferred through an iron fin of thickness 5 mm, length 10 cm and width 100 cm. Also determine the temperature difference e at the tip of the fin at: 1- adiabatic tip, 2-heat convection at the tip. Assuming the atmospheric temperature of 28°C K=50 w/mK, h=10 w/m’K, O,=80°C. B-Why is the dimensional heat flow assumption important in the analysis of fins problems? C- Why are the annular fins more efficiency than others?.Hot Air blows over steel plate with dimension (5000mm * 7.5m)), the steel plate temperature is 22'C, the convection heat-transfer coefficient is h= {25 W/m2- C}. Calculate the heat transfer? if you know that thermometer reader read air temperature is 492 K