2. Air at 20° blows over a hot plate 50X60 cm made of carbon steel maintained at 220°. The convective heat transfer coefficient is 25W/m²K. What will be the heat loss from the plate in W?
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- A modern cabin has a concrete floor that is 4.50 inches thick. Aroaring fire keeps the interior of the cabin at 21.0 0C while the airtemperature below the cabin is a chilly 2.00 0C. How much heat(J) is lost through the concrete floor in 4 hrs if the cabin measures4.50 m by 6.50m to 3 sig fig?Solve for the latent heat of water at Tw = 28C(and. λw = 2435 kJ/kg)Assuming Air at 20°C blows over hot plates 50 by 75 cm maintained at 250 °C, (h = 25 W/m². C), and that 300 W is lost from the plate surface by radiation. That the plate is made of carbon steel (1%) 2 cm thick (k=43 W/m.°C), temperature inside plates is 254°C. How much heat is transferred through the plate?
- A heated flat plate is exposed to the colder air flowing over the plate at a velocity of 35 ft/s. The plate is at a temperature of 200 F while air is at atmospheric pressure and 70 F. Find the rate of heat transfer if the plate is a) heated at the leading edge and b) at a distance of 3 in from the leading edge.H.W. Q1: Air enters a 7m long section of a rectangular duct of cross section 15 cm x 20 cm at 50°C at an average velocity of 7 m/s. If the walls of the duct are maintained at 10°C, determine (a) the outlet temperature of the air, (b) the rate of heat transfer from the air. Air properties from tables: p=1.127 kg/m³ C, =1007 J/kg.°C k = 0.02662 W/m.°c Pr = 0.7255 v=1.702×10 m²/s Answer: (a): Te = 34.2 °C, (b): Q' = 3776 W Hint: 1- Use the Logarithmic mean temperature difference relations. 2- If: Reer> 2300, in pipes and ducts, the flow is turbulent. T, = 10°C Air duet 15 cm x 20 cm Air L-7 m 50°C 7 m/s31. A uniformly heated square plate of 2 ft × 2 ft is exposed to cold air at 80 F. The heater output remains at a constant value of 1 kW. Air, at atmospheric pres- sure, flows over the plate at a velocity of 16.5 ft/s. Find the average temperature of this plate. [Ans.: - 513 F].
- A 4.5 in (inside diameter), 4.9 in (outside diameter) tube carries dry saturated steam at 10 bar. Assume that the interior temperature of the tube is the same as that of the steam. The outside air temperature is 25°C. For ksteel = 51.9 W/(m K) and hair = 13.0 W/(m2K). a) How much energy is lost, in kWh, in a 20 m long section of pipe during an 8-hoursYou are designing an enclosure which houses a PCB. Mounted outside the enclosure on its top is a set of aluminum fins, as seen in the sketch below. The enclosure (and fins) are 150mm deep long. There is no forced airflow. Neglect the thickness of the enclosure walls. Neglect heat transfer out of the sides and bottom of the enclosure. If the PCB produces 4000 W/m2: a) Most industrial-grade ICs have a maximum temperature of 85oC. If you must keep your PCB below this what is the maximum thermal resistance from the PCB to the air surrounding the fins? Assume the air around the fins stays at room temperature. b) If the top of the enclosure (and bottom of the fin base) runs at 50°?, what is the effective thermal conductivity above the PCB? Hint: Because the air inside the enclosure is trapped and heats up, any air properties NOT given below are calculated at the average air temperature (T1+T2)/2. c) What is the temperature at the base of the fins? d) What is the efficiency of the fins? e)…Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-
- Q: Air enters a rectangular duct. Determine the exit temperature of the air and find the rate of heat transfer loss . Taking k = 0.02662 W/m."C. v= 1.702x10 m'/s, Pr 0.7255, C-1007 J/kg. C ,p=1.127 kg/m u= 2.325 kg/m.s Ans : 34.2°C 3776 W Air dact 15 em 2 em L7m Q. Hot air enters a sheef metal duct located in a basement. DetermineA solid hemisphere of radius 5 cm to be cooled in air (at 20 o C, h=10 W/m 2 .K) from 200 oC to center of 150 oC, assume following sphere properties ρ=8500kg/m3, k=20W/m.K , C=400 J/kg.Ka. List assumptions and justify selected method of solution b. How long does it take to cool the hemisphere? c. What is the temperature of the surface at end of cooling?Air at 20◦C blows over a hot plate 50 by 75 cm maintained at 250◦C.The convection heat-transfer coefficient is 25 W/m2◦C. Calculate the heat transfer.Assuming that the plate is made of carbon steel (1%) 2 cm thick andthat 300 W is lost from the plate surface by radiation, calculate theinside plate temperature.