Consider a flask, as shown in Figure Q1. The flask wall is designed with an air layer sealedbetween the inner container and the outer case. The inner container has a diameter of 8.5 cm,and the case has a diameter of 9.5 cm. The flask is 17 cm tall and the outer case is made of avery thin steel material. The cap and base of the flask are well insulated.a) During a steady-state condition, the ambient air temperature is 20°C with theconvection heat transfer coefficient, ho of 4 W/m².K. Consider a uniform watertemperature Twater of 95 °C with the inner container surface at the same temperature asthe water temperature at any time. If the convection and the radiation heat transfer to benegligible within the air layer, obtain the temperature variation in the flask wall byusing the heat conduction equation.b) Determine the outer case temperature (°C) and the rate of heat loss (kW) from the flask.c) If the air layer of the flask is replaced with a vacuum layer, will the rate of heat losschange? Explain.Flask wallwaterAir layerFigure Q1A large plane wall is subjected to specified heat flux and temperature on the left surface and no conditions on the rightsurface. The mathematical formulation, the variation of temperature in the plate, and the right surface temperature are to bedetermined for steady one-dimensional heat transfer.k=2.5 W/m-°C.q=700 W/m²T;=80°CL=0.3 m

The heat flux through a plane wall in one-dimensional steady heat conditions can be calculated using…

A large plane wall is subjected to specified heat flux and temperature on the left surface and no conditions on the right surface. The mathematical formulation, the variation of temperature in the plate, and the right surface temperature are to be determined for steady one-dimensional heat transfer. k=2.5 W/m-°C. k =700 W/m? Tj=80°C L=0.3 m

A large plane wall is subjected to specified heat flux and temperature on the left surface and no conditions on the right surface. The mathematical formulation, the variation of temperature in the plate, and the right surface temperature are to be determined for steady one-dimensional heat transfer. k=2.5 W/m-°C. k =700 W/m? Tj=80°C L=0.3 m

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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Consider a wall that is 5 m high, 8 m long, and 0.22 m thick. The thermal conductivities of the various materials used, in W/m °C, are kA = kF = 2, kB = 8, kC = 20, kD = 15 and kE = 35. The left and right surfaces of the wall are maintained at uniform temperatures of 300 °C and 100 °C, respectively. If the heat transfer through the wall is one-dimensional, determine (a) the rate of heat transfer through the wall; b) the temperature at the point where sections B, D, and E meet, and c) the temperature drop across section F. Disregard any contact resistances between the interfaces.
A house has walls made out of steel with the following properties: Thickness 300 mm Density kg/m3 7800 Thermal Conductivity w/m-K 50 Specific Heat Capacity Embodied J/kg-K 500 MJ/kg 26 Energy Cost $/kg 0.70 The time that it will take, in hours, for the interior temperature to start changing after the exterior is exposed to a sudden temperature is:
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Heat transfer
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‏Q1 / A5 - cm - diameter steel pipe is covered with a 1 - cm layer of insulating material having k = 0.22 W / m . ° C followed by a 3 - cm - thick layer of another insulating material having k = 0.06 W / m . ° C . The system is exposed to a convection surrounding condition of h = 60 W / m² . ° C and T -15 ° C . The outside surface temperature of the steel pipe is 400 ° C . Calculate the heat lost by the pipe - insulation assembly for a pipe length of 20 m . Express in Watts .
A house has a three meter deep basement (foundation) wall that is in a 10 meter by eight meter rectangular shape based on interior dimensions. On average, 2.5 meters of the wall is below grade. Assume the outside air temperature is 38°C and the inside temperature is 20°C; there is an average ground temperature of 27°C. Determine the rate of heat loss through the wall if it is insulated with an R-value of about 30°C.m^2/W.
Its thickness is 1.18 m, its thermal conductivity is 2.75 W/m.°C and its surface area is 15m2Consider a wide plane wall. Inside of the base plateThere is a uniform heat flux produced on its surface with the help of the resistance wire inside.590 W/m2 on the left surface of the wall at x=0net heat fluxand the temperature on this surface was measured as 590 °C. On the wallassuming that there is no heat generation and that the thermal conductivity is constant;a) The differential equation for continuous one-dimensional heat conduction in the wall, andSet the boundary conditions.b) Solve the differential equation to obtain a relation for the temperature change at the wall.c) Calculate the heat loss rate from the wall.
I got t=531.96 seconds is that right