Mr. Bane is observing a protrude fin with athickness of 0.0295 inches with a thermalconductivity of 75 SI unit. He also noticed that itprotrude 0.984 inches from a cylindrical surface of0.050 m diameter and 3.28 ft length which wasexposed in an atmosphere having a 40°C. If thecylindrical surface is maintained at 150°C and theheat transfer coefficient is 23 SI units, calculate therate of heat transfer.A 1189.4 WB 1003.4 W(c) 358.4 W2035.4 WE 1670.4 WF) None of these

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Answered: Mr. Bane is observing a protrude fin…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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QUESTION 3 A steel pipe 150mm external diameter conveys steam at a temperature of 260°C and is covered by two layers of lagging, each 50mm thick. The thermal conductivity coefficient of the inside layer of lagging is 0.0865W/mK while that of the outside layer is 0.0952W/mK. The outside surface temperature of the steel pipe can be taken as being the same temperature of the steam. The ambient temperature is 27°C and the heat transfer coefficient of the outside surface is 15W/m2K. Calculate: 3.1 the heat lost/hr for a pipe length of 30m;
A composite structural wall having a thermal conductivity of 0.3 W/mK and a thickness of 100 mm is being replaced by a concrete wall having thermal conductivity 0.9 W/mK. If the heat rate is to be 80% of the heat rate through the composite wall, the wall thickness (in mm) required for concrete wall is. Assume both walls are subjected to the same surface temperature difference.
Example 2.10 Consider a 25 mm x 25 mm x 1 mm thick silicon die attached to a same size 2 mm-thick copper cap through a 0.1 mm thick thermal interface material (TIM) as shown in Figure 2.1. Convection heat transfer coefficient on the top side of the copper cap is 2500 W/m²°C. If thermal conductivity of silicon, copper, and thermal interface material are 125, 390, and 5 W/m°C, respectively, what is the total thermal resistance from the active (bottom) side of the silicon die to outside ambient?
A boiler furnace wall must have a heat loss no greater than 700 Btu/hr~ft2 and is madeof a material with a thermal conductivity of 0.60 Btu/hr~ft~F. The inner wall surfacetemperature is '2000°F, and the outer surface temperature is 800°F. What wall thick~ness is required?
A furnace of 0.3m by 0.3m by 0.6m inside dimensions is constructed of a material having a thermal conductivity of 0.894 W/m.K. The wall thickness is 10cm. The inner and outer surface temperatures are 600 degree Celcius and 100 degree Celcius respectively. Calculate the heat loss through the furnace wall by using (i) Conduction shape factor. (ii) Thermal resistance.
Calculate the energy transfer rate across a 6″ wall of firebrick with a temperature difference across the wall of 50°C. The thermal conductivity of firebrick is 0.65 BTU/hr -ft-°F at the temperature of interest.
Thermal Conductivity Problems: a. A wall is made of firebrick 6 inches thick and has a 50°C difference in temperature both sides. Calculate the heat transferred through the wall if the thermal conductivity of the brick is 0.65 BTU/hr-ft- oF. b. Compute the amount of heat flow per second through an iron plate 2 cm thick and the area of 5000 cm² if one face has a temperature of 150°C and the other face is 140°C? The thermal conductivity for iron is 80 W/m-K.
Heat transfer through composite walls The wall of a refrigerated van is of 1.5 mm steel sheet at the outer surface, 10 mm plywood at the inner surface and 2 cm of glass-wool in between. Calculate the rate of heat flow if the temperatures of the inside and outside surfaces are -15⁰C and 24⁰C. Take k(steel) = 23.2 Wm-1K-1 k(glass-wool) = 0.014 Wm-1K-1 k(plywood) = 0.052 Wm-1K-1.
If a heat transfer coefficient of 2.84 W l(m2 • K) exists on each of the two inside faces of two sheets of 6.35-mm-thick glass separated by an air gap, calculate the gap that can be used such that the rate of heat transfer by conduction through the air gap equals the rate of heat transfer by convection. What is the rate of heat transfer if this gap is exceeded. The thermal conductivity of air of 0.0242 WI (m . K). Solve for temperature of 20°C and 12°C on the outside surfaces of the glass. Would the calculated gap change in value for different values of the surface temperatures? Would there be any advantage to increasing the gap beyond this calculated value?
1. Consider a 5-m-high, 8-m-long, and 0.22-m-thick wall whose representative cross section is as given in the Fig. The thermal conductivities of various materials used, in W/m-°C, are k = kr = 2, KB = 8,kc=20, KD = 15, and k = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300 °C and 100 °C, respectively. Assuming heat transfer through the wall to be one-dimensional, determine: (a) the rate of heat transfer through the wall; (b) the temperature at the point where the sections B, D, and E meet; and (c) the temperature drop across the section F. Disregard any contact resistances at the interfaces. 300°C 1 cm C A 4 cm B 4 cm 4 cm D C 6 cm 5 cm 6 cm E| F 10 cm 6 cm 100°C 8 m

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