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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The inner diameter of the pipe is 12.7 cm, and the thickness of the pipe is 2.4 cm. The convective heat transfer coefficient in the pipe is 350 W / (m² °C), the convective heat transfer coefficient outside the pipe is 25 W / (m² °C), the thermal conductivity of the steel pipe is 15 W / (m °C) . If a pipe is used to deliver steam at 110 °C and the ambient temperature is 30 °C, determine the rate of heat transfer from the pipe per meter. q = Answer
Watts/m
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- A 10 ft length of pipe with an inner radius of 1 in and outer radius of 1.25 in has an outer surface temperature of 250 F. The heat transfer rate is 30,000 BTU/hr. Find the interior surface temperature. Assume k = 25 BTU/hr-ft-F.arrow_forwardThermal Conductivity of Aluminum is 200 steel is 20 G10 Fiberglass 0.3arrow_forwardAnswer this ASAP The diameter of the tube is 25 mm. The specific heat of water is 4.18 kJ/kg. °C. The overall heat transfer coefficient is 0.7 kW/m².°C. 1.Cmin 2.Maximum heat transfer rate 3.Heat transfer surface areaarrow_forward
- Q5/ A hot steam pipe having an inside surface temperature of 250 C has an inside diameter of 8 cm and a wall thickness of 5.5 mm. It is covered with a 9-cm layer of insulation having k=0.5 W/m. C, followed by a 4-cm layer of insulation having k =0.25W/m. C. The outside temperature of the insulation is 20-C. Calculate the heat lost per meter of length. Assume k =47 W/m. C for the pipe.arrow_forwardA room is well insulated apart from a single-glazed window measuring 1 m2 and 4 mm thick. The internal air temperature is 22oC and outside it is -12oC. If the external convective heat transfer coefficient, hout, is double that of the inside coefficient, and the conductivity in the glass is negligible. Determine hout if Q = 100 W.arrow_forward= 31. A circular fin of diameter D = 0.25 inches and length L 4 inches transfers heat at a rate Q = 5.66 Btu/hr to air. The convective heat transfer coefficient is 3.62 Btu/hr-ft²- °F and the temperature difference between the fin-wall interface and the air is 100 °F. What is the thermal conductivity of the fin? What is the temperature of the fin tip?arrow_forward
- Suppose that the 10 cm thick concrete wall of a commercial building measures 30 mby 4 m. The energy impinging on the surface is 700 W/m^2. Under these conditionsthe external air temperature is 25ºC, and the internal and external surfacetemperatures of the concrete wall are 17ºC and 40ºC, respectively. Calculate the net amount of thermal energy radiated by the wall answer = 41,880 W Data for wall: Heat transfer coefficient of air at 25ºC = 5 W/m^2KThermal conductivity of concrete = 1.2 W/mKEmissivity of concrete = 0.85Stefan’s constant = 5.7 x 10^-8 W/m^2K^4arrow_forwardHeat transferarrow_forwardCalculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The inner diameter of the pipe is 12.7 cm, and the thickness of the pipe is 2.4 cm. The convection heat transfer coefficient in the pipe is 350 W / (m² ° C), the convective heat transfer coefficient outside the pipe is 25 W / (m² ° C), the thermal conductivity of the steel pipe is 15 W / (m ° C). If the pipe is used to deliver steam at 110 ° C and the ambient temperature is 20 ° C, determine the heat transfer rate of the pipe per meter. q = Watt / marrow_forward
- Determine the overall heat transfer coefficient based on the outer area of a 3.81 cm O.D and 3.175 cm I.D brass tube (thermal conductivity = 103.8 W/mk) if the heat transfer coefficients for flow inside and outside the tube are 2270 and 2840 W/m2 k respectively. The unit fouling resistances at inside and outside surfaces are R = R, = 8.8 x 103 m2 KW.arrow_forwardWhat is the product of overall heat transfer coefficient and area (UA) for a heat transfer equipment with the geometry as shown in the diagram? The inner tube (the shaded area in the figure) is made of a material with thermal conductivity of 1.2 W/m.K. The convection coefficient of the hot fluid (in the inner tube) is 25 W/m².K and that of the cold fluid is 12 W/m².K. The dimensions shown in the figure are r₁ 0.1 m, r₂ = 0.15 m, and r3 = 0.3 m. The length is 1 m. 4.86 W/ Cold Fluid Hot Fluid TI =arrow_forwardcan you please please work it all outarrow_forward
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