1
㳿 F = 300 2. h = 1,20 , t = - 15.
ʳ t1 = +5, = 20%. ( ) Z=30 . ' δ=10 .
г
I. , , 300 ∙ 1,2 = 360 3. ٳ q=1600 /3 ( .2.2-1, . 1).
20% 1 3 :
q1 = 1600 ∙ 0,20 = 320
II. , . tHB = -15. tcp. = 1/3 tHB = -15/3 = -5 ( ).
, -5 75%.
, q1 = 320 q = 320 ∙ 0,75 = 260 .
III. 1 3 .
1) 1 3 tcp. = -5 t1 = +5 :
Q1 = C(t1 - tcp.) q = 0,2 (5 + 5) 1600 = 3200
C = 0,2 - .
2) tcp. = -5 0 :
Q2 = 0,5 (0 + 5) 260 = 650
0,5 - .
3) ( 80 )
Q3 = 80 ∙ 260 = 20800 .
4) , 0 t1 = +5
Q4 = 1,0 ∙ 5 ∙ 260 = 1300 .
5) , 360 - 260 = 100 tcp. = -5 t1 = +5 :
Q5 = 1,0 (5+ 5) 100 =1000 .
1 3
Q = Q1 + Q2 + Q3 + Q4 + Q5 = 3200 + 650 + 20800 + 1300 + 1000 = 26 950 .
(360 3)
26950 ∙ 360 = 9702000 .
, . .
, , , , tcp. = -5 z ≈ Z/3 = 10 .
|
|
:
F - , ; F = 300 2;
t1 = +5; t = - 15;
R - ;
R = 0,05+ δ/λ = 0,05 + 0,10/0,05 = 2,05 2/∙∙ ( );
β = 2,30 - , .
1 3 , ,
9702000 + 67500 = 9769500 .
, 76% 12% - , .
-. 㳿 :
㳿 1 3 , , :
W1 = 11340/360 =31,5 ∙.
2
z, :
t = -6; t=+80;
α =0,0008;
= 0,6 .
г
:
= 0,6
f()=2*