. .
1) .
- 23-02-2003 1 .
.
- 23-02-2003. , . .
- 2 23-02-2003 (* .1) (* . )
..
Ro Rred, .
2) Dd, o
Dd = (tint tht)× Zht, (1)
[ 23-02-2003]
tint ,
30494, o :
tint = 20 o;
tint = 22 o.
tht, Zht , o,
, .,
23-01
8 oC.
.
tint = 20 o;
tht = - 6.4o;
Zht = 226
Dd = { 20 (- 6.4)}× 226 = 5996.4.o.
\
3) R red, 2 / .,
R red = a D d +b, (2)
[H 23-02-2003]
Dd - , oC .,
;
a, b ,
4
6.
R red = 0,00035× 5996.4+1,4 = 3.482 0/
Rred . = 0,00045 × 5996.4+ 2,2 = 4.582 0/
4) () R, 2/
R = Rsi + Rk + Rse; (4)
[ 23-101-2004]
Rsi =1/aint;
aint;
7
23-02-2003, /2;
R ,
2 /, : ()
(5);
Rse =1/aext;
aext
Rk
Rk = R1 + R2 +/ Rn,
R1, R2; Rn 2*/m
|
|
|
5) () R, 2/
Rk = d| l, (5)
[C II -3 79*]
d , ;
l ,
/(), 3*
) R (4)
, - :
Rk = δ / λ [C II -3 79*]
ɣ=1800/3;
:
λ=0,87 /();
ɣ =40 /3, λ= 0.076 /( C)
(1) -
(δ=30,ɣ=1600 /3,λ=0.81 /)
(2)
(δ=640,ɣ=1800 /3,λ=0.87/)
(3)
(ɣ=40 /3,λ=0.05 / )
(4) -
(δ=40, ɣ=1800 /3,λ=0.76/)
1
aint= 8.7 /(2)
aext = 23 /(2)
Ro =1/8,7 + 0.037 + 0.74+/0,05 + 0.45+1/23 = 0,115+0.037+0.74+ 0.45+0,045=1.385 + /0,05
R = 0.918+ /0.04
, Ro = R red., Rred.= 3.492 /,
3.49 = 1.385+ /0.05;
/0.05 = 3.49 1.385;
/0.05= 2.105;
=0.05 * 2.105;
= 0.105
10 .
Ro . (4)
(1) \ δ=220, ɣ=2500/3;
λ=2.04/()_______________________________
(2) _________________
(3) (ɣ=200 /3,λ=0.076 / )
(4)-
(δ=40, ɣ=1800 /3,λ=0.93/)
2
2
| δ, | λ, /() | R=δ/λ2/ | |
| 1. | 0.22 | 2.04 | 0.1 |
| 2. | 0,076 | / 0,076 | |
| 3. - | 0.04 | 0.93 | 0.4 |
| : | 0.15+/0.076 |
aint = 8.7 /(2);
aht = 12 /(2)
Ro .=1/8.7 + 0.1 + /0.076 + 00.4 + 1/12=0.395+/0.076=0.176
Ro = Rred., Rred.= 4.582/,
4.58 = 0.335 + /0,076;
/0,076 =4.58-0.335
= 4.24 0.076;
= 0.32
32.
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