Answered: a temperature of 20 C. Determine the…

a temperature of 20 C. Determine the time required for the iron plate to drop from 850 C to 250 C? Density, specific heat value and conductivity

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.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.29P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A 1800-W iron plate has a thickness of 4 mm, cross-sectional area of 340
cm^2. The room convection heat transfer coefficient is 20 W/(m^2K) with
a temperature of 20 C. Determine the time required for the iron plate to
drop from 850 C to 250 C? Density, specific heat value and conductivity
of the plate are 2750 kg/m^3, 900 J/(kgK) and 180 W/(mK), respectively.
500 seconds
635 seconds
O none
450 seconds
800 seconds

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