PRENOS TOPLOTE
PRENOS TOPLOTE
PRENOS TOPLOTE
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<strong>PRENOS</strong> <strong>TOPLOTE</strong> – STACIONARNI <strong>PRENOS</strong> <strong>TOPLOTE</strong><br />
Temperaturna porazdelitev v steni<br />
je linearna funkcija razdalje (debeline)<br />
T 1<br />
T 2<br />
q<br />
dT<br />
= −λ<br />
⋅ A<br />
dl<br />
⎛ ⋅ A ⎞<br />
= ⎜<br />
λ ⎟×<br />
⎝ l ⎠<br />
& q&<br />
( − )<br />
⎛<br />
⎜<br />
⎝<br />
l<br />
λ ⋅ A<br />
⎞<br />
⎟<br />
⎠<br />
Termični upor ravne stene<br />
T 0<br />
T 1<br />
T 1<br />
λ 1 , l 1 λ 2 , l 2 λ 3 , l 3<br />
Toplotni tok v sestavljeni steni<br />
T 2<br />
A⋅( T0<br />
−T<br />
)<br />
T 3<br />
T 4<br />
1<br />
q&<br />
=<br />
⎛ l ⎞<br />
∑⎜<br />
⎟<br />
⎝ λ ⎠<br />
Pojavi se še kontaktni upor<br />
odvisen od hrapavosti,<br />
temperature, tlaka in vrste<br />
snovi
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