Ro (4.3)
Ro = Rsi + Rk + Rse, /(2), (4.3)
Rse = 1/αext, αext - , /(2), [2, . 9.1.2,. 8 ];
Rsi = l/αint, αint - , (2.1);
Rk , (20)/, (4.4)
Rk = R1 + R2 +... + Rn,(20)/ (4.4)
R1, R2,..., Rn - , 2×/, (4.5)
R = δ/λ,(20)/ (4.5)
δ - , ;
λ - , /(×)
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, : R1 = 0,1/0,041=2,439, (20)/;
1 : R2 = 0,2/1,69=0,118, (20)/;
2 : R3 = 0,045/0,17=0,265, (20)/;
3 : R4 = 0,05/0,58=0,086,(20)/;
(4.4)
Rk=0,118+0,265+0,086=0,469,(20)/;
(4.3)
Ro = 1/8,7+0.469+1/23=0.627,(20)/
Ro = 1/8,7+2,439+1/23=2,597, (20)/
R0, , Rred, - Dd,
- Dd, (4.6)
Dd = (tint - tht)*zht, ѷ (4.6)
zht - , , . 1.1;
tht - , C, .1.1;
Dd = (20+5,4)*221=5613.4, (ѷ)
, , :
R0=2,9, (2)/
R0=2.12, (2)/
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(4.7)
Q=F /Rreq×(tint-text)×n, (4.7)
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F , 2;
Rreq , (4.1);
tint - , (4.1);
text , (4.1);
n , (4.2)
(4.8)
Q=F /R0×(tint-text)×n, (4.8)
F , 2;
R0 [ 4.3];
tint - , (4.1);
text , (4.1);
n , (4.2)
(4.9)
Q=F /R0×(tint-text)×n, (4.9)
F , 2;
R0 [ 4.3];
tint - , (4.1);
text , (4.1);
n , (4.2)
4 |
Q=F /Rreq×(tint-text)×n=2840/1,19×(20+32)×1=124100,84,
Q= F / Rreq×(tint-text)×n =4500/1,43×(20+32)×0,6=98181,82,
Q= F /Rreq×(tint-text)×n =60/1,19×(20+32)×1=2621,85,
Q= F /R0×(tint-text)×n =2840/2,9×(20+32)×1=50924,14,
Q= F / R0×(tint-text)×n =4500/2,12×(20+32)×0,6=66226,42,
Q= F / R0×(tint-text)×n =60/0,34×(20+32)×1=9176,47,
(4.4)
Q=(Q+Q) ×1,2, (4.4)
Q1=(50924,14+9176,47)×1,2=72120,732,
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