, , . - 22 . Qh.ldes = 2500 . : Yn = 122,5 /, L = 98,8 /. = 8 . D tdes (66), 20 - (-22) = 42 . , ( ) .
(64)
Qp.c = 2500(24/8) = 7500 .
2, L/ Yn = 98/122,5 = 0,81 Qp.c /(LD tdes) = 7500/(98,8×42) = 1,81. vc = 18.
Qp.c, , 11.2.2.6 (-22 + 5) = 17
Qp.c = Qh.ldes [ tint - (text + 5)]/ (tint - text) = 2500(20 + 17)/(20 + 22) = 2202 .
Qb (65)
Qb = 2500 - 2202 = 298 .
()
.1
1
, 23-02 12- = 34,8 . . v = 5,5 /. D p = 10 G = 3,94 /(2×), = 0,55.
. 23-02 0,92 35 , 21 .
(69) (70):
g ext = 3463/[273 + (-35)] = 14,55 /3;
g int = 3463/(273 + 21) = 11,78 /3.
D p (68)
D p = 0,55×34,8(14,55 - 11,78) + 0,03×14,55×5,52 = 66,22 .
(72)
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Rinfreq = (1/5)(66,22/10)2/3 = 0,71 2×/.
(73)
Rinf = (1/3,94)(66,22/10)0,55 = 0,72 2 /.
, 23-02.
2
. - . . tint = 20 . 23-01 tht zht . : tht = -2,8 ; zht = 227. - , (1),
Dd = (20 + 2,8)227 = 5176 ×.
4 23-02 Rreq = 0,538 2×/.
( ) - .
( 0,75) Ror = 0,545 2×/ > Rreq = 0,538 2×/.
26602.2 .1. .
8.6 23-02 - . .
- ( );
- - ( )
.1 - Q 1 D , , 26602.2
3
. - . . tint = 20 . 23-01 tht zht . : tht = -3,0 ; zht = -218 .
- , (1),
Dd = (20 + 3,0)218 = 5014 ×.
Rreq = 0,526 2×/.
9- .
( , 0,75) R0r = 0,6 2×/ >Rreq = 0,526 2×/.
.1. 26602.2 .
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23-02 .
, 23-02 9- .