flat wall is exposed to the environment. The wall is covered with a layer of insulation 1.0 in. thick whose thermal conductivity is 0.8 Btu/hr-ft-'F. The- temperature of the wall on the inside of the insulation is 600°F. The wall loses heat to the environment by convection on the surface of the insulation. The average value of the convection heat transfer coefficient the insulation surface is 950 on Btu/hr-ft-°F. Compute the bulk temperature of the environment (T) if the outer surface of the insulation does not exceed 105°F.

flat wall is exposed to the environment. The wall is covered with a layer of insulation 1.0 in. thick whose thermal conductivity is 0.8 Btu/hr-ft-'F. The- temperature of the wall on the inside of the insulation is 600°F. The wall loses heat to the environment by convection on the surface of the insulation. The average value of the convection heat transfer coefficient the insulation surface is 950 on Btu/hr-ft-°F. Compute the bulk temperature of the environment (T) if the outer surface of the insulation does not exceed 105°F.

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

See similar textbooks

Similar questions

A cold-storage room is constructed of an inner layer of 11 mm of pine with thermal conductivity of 0.15 W/m K, and an outer layer of 75 mm of concrete with thermal conductivity of 0.75 W/m K. The wall surface temperature is 253 K inside the cold room and 299 K at the outside surface of the concrete. Calculate the heat loss in W per 1 m2. Please keep one decimal and take positive value for the final answer.
A ball made of steel alloy with a diameter of 2 millimeters is first heated to 800 degrees and then suddenly immersed in a water bath to cool down to 100 degrees. The materials from which the ball is made have a thermal conductivity coefficient of 54.94 w / mk, a heat capacity of 7860 kg / m3, a heat capacity of 450 j / kg. Also, the heat transfer coefficient is 41.66 2 / m2. a-)Find the temperature of the ball immersed in water after 10 seconds. b-)Find the time required to cool the ball to 400 degrees.
b) The fuselage of an aeroplane consists of the following three layers: the outer layer made from aluminium alloy of a thickness 20 mm, the middle layer having convection heat transfer coefficient, h of 10 W/m2°C and an inner layer of plastic of a thickness 40 mm. If the temperature outside the aeroplane is -60 degrees centigrade at a high altitude and the inside of the fuselage is to be maintained at +20 degrees centigrade, find: i) The heat loss per unit area (Note: Area = 1 m²) ii) The temperature at the common surfaces. Thermal conductivity, k values are: Aluminium alloy = 4 W/m °C Plastic layer = 0.5 W/m °C
It is designed in such a way that the internal temperature of a commercial heat treatment furnace can reach up to 165 oC. All surfaces of the furnace consist of firebrick (10 cm), insulation material and sheet metal (3mm) from the inside out. Given that the outdoor temperature is 22 oC, the outer sheet will be allowed to go up to 35 oC, which is a temperature that will not disturb in contact with hands. In this case, determine the insulation material thickness to be used. The thermal conductivity coefficient of the insulation material is insulation 0.066 W / m oC, 60 W / m oC for sheet metal and 115 W / m oC for firebrick. Indoor heat transfer coefficient will be accepted as 25 W / m2 oC and 12 W / m2 oC for outdoor environment.
Please solve this question in thermodynamics
A furnace wall consists of 2 ft of brick . The brick has athermal conductivity of 0.6 Btu/ hr sq ft ( ° F /ft), a specific heat of0.2 Btu/ lb ° F, and a density of 110 lb/cu ft. The temperature atthe inside surface of the wall is 1100 ° F , and at the outside surface,200 ° F .(a) Calculate the thermal diffusivity of the brick .(b) Calculate the heat loss per hour through a wall 10 ft high and10 ft long(c ) Calculate
In a composite slab, the temperature at the interface (Tinter ) between two materials is equal to the average of the temperature at the two ends. Assuming steady one dimensional heat conduction, which of the following statements is true about the respective thermal conductivities?
heat transfer question
Temp base is 156 not 456 as in the diagram
The thermal conductivities of human tissues vary greatly. “Fat” and “skin” have conductivities of approximately 0.200 W /m 0K and 0.0200 W /m 0K, respectively, while other “tissues” inside the body have conductivities of approximately 0.500 W /m 0 Assume that between the core region of the body and the skin surface lies a “skin” layer of 1.00mm, a “fat” layer of 0.500 cm., and 3.20 cm. layer of other “tissues”. A)Find the R-factor for each of these three layers, and the R-factor for all layers taken together
A metal plate has a surface area of 2 m², thickness 100 mm and a thermal conductivity of 200 W/mK. The thermal resistance of the plate in (K/W) is
A polished metal pipe (8 cm) outside diameter and 350 K temperature at the outer surface is exposed to ambient conditions at 285 K temperature. The emissivity of the surface is 0.3 and the convection coefficient of heat transfer is 13.5 W/m2-deg. What would be the overall coefficient of heat transfer by the combined mode of convection and radiation?