열전달 Engineering Fundamentals of Heat and Mass Transfer Frank PIncropera David PDeWitt 자료 Solution Manual 대학교재솔루션 솔루션

열전달 Engineering Fundamentals of Heat and Mass Transfer Frank PIncropera David PDeWitt 자료 Solution Manual 대학교재솔루션 솔루션

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열전달 Engineering Fundamentals of Heat and Mass Transfer Frank PIncropera David PDeWitt 자료 Solution Manual 대학교재솔루션

열전달 6판입니다. 전범위 솔루션입니다

PROBLEM 1.1 KNOWN: Heat rate, q, through one-dimensional wall of area A, thickness L, thermal
conductivity k and inner temperature, T1. FIND: The outer temperature of the wall, T2. SCHEMATIC:

ASSUMPTIONS: (1) One-dimensional conduction in the x-direction, (2) Steady-state conditions, (3) Constant properties. ANALYSIS: The rate equation for conduction through the wall is given by Fourier’s law,

q cond = q x = q ′′ ? A = -k x
Solving for T2 gives

T ?T dT ? A = kA 1 2 . dx L

T2 = T1 ?

q cond L . kA

Substituting numerical values, find

T2 = 415 C -

3000W × 0.025m 0.2W / m ? K × 10m2

T2 = 415 C - 37.5 C T2 = 378 C.
COMMENTS: Note direction of heat flow and fact that T2 must be less than T1.

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PROBLEM 1.2
KNOWN: Inner surface temperature and thermal conductivity of a concrete wall. FIND: Heat loss by conduction through the wall as a function of ambient air temperatures ranging from -15 to 38°C. SCHEMATIC:

ASSUMPTIONS: (1) One-dimensional condu

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