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A 20 by 20 cm slab of copper 5 cm thick at a uniform temperature of 260◦C suddenly has its surface temperature lowered to 35◦C. Using the concepts of thermal resistance and capacitance and the lumped-capacity analysis, find the time at which the center temperature becomes 90◦C; ρ=8900 kg/m3, cp =0.38 kJ/kg · ◦C, and k =370 W/m· ◦C.

A 20 by 20 cm slab of copper 5 cm thick at a uniform temperature of 260◦C suddenly has its surface temperature lowered to 35◦C. Using the concepts of thermal resistance and capacitance and the lumped-capacity analysis, find the time at which the center temperature becomes 90◦C; ρ=8900 kg/m3, cp =0.38 kJ/kg · ◦C, and k =370 W/m· ◦C.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A 20 by 20 cm slab of copper 5 cm thick at a uniform temperature of 260◦C suddenly
has its surface temperature lowered to 35◦C. Using the concepts of thermal
resistance and capacitance and the lumped-capacity analysis, find the time at which
the center temperature becomes 90◦C; ρ=8900 kg/m3, cp =0.38 kJ/kg · ◦C, and
k =370 W/m· ◦C.

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