옴의 법칙
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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 conduction …(skip)
순서
레포트/공학기술
전류와 전압의 관계를 파악한다.
옴의 법칙
옴의,법칙,공학기술,레포트
전류와 전압의 관계를 파악한다.
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다.