One side of a wall is maintained at 400 K and the other at 300 K. The rate of heat transferthrough the wall is 1000 W and the surrounding temperature is 25°C. Assuming nogeneration of heat within the wall, the irreversibility (in W) due to heat transfer through thewall is

Given. One side of a wall is maintained at,T1=400 KT2=300 KHeat transfer rate,Q=…

Answered: the irreversibility (in W) due to heat…

Engineering

Mechanical Engineering

the irreversibility (in W) due to heat transfer through the

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.39P: The tip of a soldering iron consists of a 0.6-cm- diameter copper rod, 7.6 cm long. If the tip must...

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

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One side of a wall is maintained at 400 K and the other at 300 K. The rate of heat transfer
through the wall is 1000 W and the surrounding temperature is 25°C. Assuming no
generation of heat within the wall, the irreversibility (in W) due to heat transfer through the
wall is

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2.(b) The inner and outer surfaces of a 25-cm-thick wall are at 27 oC and 45 oC, respectively. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at 40 oC, and convection with ambient air at 42 oC with convection heat transfer coefficient of 9.0 W/m2 K. Solar radiation incident on the surface is at a rate of 150 W/m2. If the emissivity and the solar absorptivity of the outer surface are 0.75 and 0.85, respectively: (i) write the expression of the energy balance at the outer surface; (ii) write the expression of conduction heat flux; (iii) calculate the convection heat flux; (iv) calculate the radiation heat flux; (v) calculate the effective thermal conductivity of the wall.
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