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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Question

Consider a flask, as shown in Figure Q1. The flask wall is designed with an air layer sealed
between 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 a
very 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 the
convection heat transfer coefficient, ho of 4 W/m².K. Consider a uniform water
temperature Twater of 95 °C with the inner container surface at the same temperature as
the water temperature at any time. If the convection and the radiation heat transfer to be
negligible within the air layer, obtain the temperature variation in the flask wall by
using 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 loss
change? Explain.
Flask wall
water
Air layer
Figure Q1
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.
q=700 W/m²
T;=80°C
L=0.3 m

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I got t=531.96 seconds is that right