=10-6 [(Lc-Hc)
8.1. :
1870 ; 37 ; 870 /3;
805 /3; , .
. , . (4.2):
h =1870 − 37=1833
(4.4)
= (805 +870)/2=837,5 /3
(4.1)
P = 1833∙837,5∙9,81∙10-6 =15,06
8.2. :
2650 ; ; = 8 ; , = 12 ; t =20 ; tnn= 70 .
. 4.1.
. (4.3).
- .
, (, t). , t = (20 + 70)/2 = 45 .
4.1 − :
1 − t = 20 ; 2 − t = 70 ; 3 − t =45 C
=f(, t) . 4.1 , t = 45 ( 3). . 3 =8 =
11,3 : = 775 /3.
o (4.3) :
=2650∙775∙9,81∙10-6 + 8 = 28,15 .
, t = 45 = 11,3 = 28,15 775 /3. , . = 28,15 , = 11,3 772,5 /3 (. 3 . 4.1).
6,5∙10-4 1/. ,
(P) = ()/ [1− (p − )] (4.19)
(P) =
= (772,5 + 781,1)/2 = 776,9 /3
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, =
8 =11,3 = 11,3 =28,15 775 776,8 /3. - = 8
=28,15 , 776,6 /3.
> :
= 2650∙776,5∙9,81 ∙ 10 -6 + 8 =28,19 .
, , >
= %.
, 0,15 %, .
4.3. , :
1000 ; 0,1302 ; 850 ; 0,062 ; 50 3/; 1,06; 853 /3; 880 /3;
1∙10 -5 2/; 0,2; 1100 /3; 650 ; 150 .
.
. , , , . (4.7):
Re =1,274∙50∙1,06/(86400∙0,1302∙1∙10-5) = 600.
Re = 600 < Re = 1600, (4.5)
. (4.6),
/= 1000 (0,1302) 2/[(0,1302) 2 + (0,062) 2] = 815 .
(4.6) − .
(4.6) , (4.4)
= (853+880) /2 = 866,5 /3,
= 866,5 +(1100 − 866,5)∙0,2 =913,2 /3,
(4,9):
=10-6[(1100−850)∙913,2∙9,81+(850−650)/880∙9,81+(650−150)∙913,2∙9,81]=
(1,344 + 1,726 +4,479)= 7,55 .
4.4. - :
1700 ; 100 3/; 0,1503 ; 0,0503 ; 810 /3; 778 /3; 1,12; 2∙10 -5 2/; 1100 ; 600 ; 95 .
1160 /3.
(4.12), (4.13) (4.14). .
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1.
2.
3. .
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