--
: ..
( , )
: ..., ..
Ó , 2015
2 R
1. .
2500 . , , , , 50% ( ).
35 10 :
, C 10 20 30 40 50 60 70
R60", 450 300 200 130 90 60 40
( "") () , , .
, -, (, - , - , - ) "" . . , , .
:
10C - 150 ;
20C - 220-750
, .
2. .
. . 5 ., 2 .
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. . R60" R15", . ( R60"/ Ra15" 10000 * 35 t = 10-30C 1,3.)
, , , ; 35 , , , .
:
Tx = [(Rx - Ro)/ Ro]*(235 + To) + To
Rx - Tx
Ro , To ( )
R60 ", , R60 " 2, 1
1 2
t2- t1 C | 2 | t2- t1 C | 2 |
1,04 | 1,5 | ||
1,08 | 1,84 | ||
1,13 | 2,25 | ||
1,17 | 2,75 | ||
1,22 | 3,4 |
1. »
Tx = [(Rx - Ro)/ Ro]*(235 + To) + To
: Ro = 10,2 ; To = 25C; Rx = 10,4 .
Tx -?
. 110 , - Ro = 10,2 ; To = 25; Rx = 10,4.
Tx = [(Rx - Ro)/ Ro]*(235 + To) + To = [(10,4 10,2)/10,2] *260+25 = 30,09
Tx =30.
2: R
2
2 () .
. | . | R, Ro . | To C | . R. | . . T C | .R.. To C | .11 . 7 | tC - | 2 | . |
25000/110 | 109,8 | 24,8 | 1,22 |
. .
( ) 30 -25 = 5C, 1 2 = 1,22.
R, , 25C 90*1,22 = 109,8C. 170*0,5 = 85; 109,8 85 = 24,8 .
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3 2
3 .
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. | . | R, Ro . | To C | . R. | . . T C | .R. . To C | .11 7 | tC - | 2 | . |
25000/110 | 90*1,22109,8 | 109,8-85=24,8 | 25-50=-5 | 1,22 | ||||||
31500/110 | ||||||||||
31500/110 | ||||||||||
16000/110 | ||||||||||
40500/110 | ||||||||||
-6300/35 | ||||||||||
4000/35 | ||||||||||
-2500/35 | ||||||||||
-6300/35 | ||||||||||
-25000/110 |