zadatak 3-2
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2.1.
, :
[m2]
:
z1
z2
d [m] l [m]
2.
ldzzHk = 21
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s1 ( )
s2 ( )
b
ds1
z
a,
l
1
(z -1)s1
c
z2 s2
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:
[m2]
:
b
adzbaF = 1
a
l
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2.2.
-
-
,
[kJ/kg]
:
[kJ/kg]
:
[kJ/kg]
( )1IIQ ''lk =
( ) ( ) ( ) ( ) ( )Vo
OH
o
OHN
o
NCORO ctVctVctVctVI 111 222222 +++=
( ) 310
==
r
kkpdCRB
tkHQQQ
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Br[kg/s]
Hk [m2] Il [kJ/kg]
I1 [kJ/kg] -
,
:
[kJ/kg]dkCR QQQ +=
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5 , ,
:
[kJ/kg]
:
[kJ/kg] :
h [-]
- (x = 1), -4,
144, (h=0,8)
Qr
[kJ/kg]
Fz [m2] ( 1)
r
ul
r
po
rul
ddB
Hq
QQ
=
z
rr
h
po
r F
QB
q
=
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:
[m2]
j:s1 [m]
z1
l [m]
lszH 1ulr 11
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5
, , :
[kJ/kg]
:
xsn < 1
-2
142
Hsnr= Hul
r[m2]
-
r
sn
r
po
rsndsnd
B
HqxQQ
=
dsnuld
izd QQQ
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( ),
:
[W/m2K]
(
), k
:
[W/m2K]
:
1 [W/m2K]
k
1
= 11
1k
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[m2K/W] (
,
, ,
, .)
[-] (
). 23, 76,
.
7.2.4. .
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:[W/m2K]
:
[-] .
k [W/m2K] ;
( 7.2.1. )
r [W/m2K] ;
( 7.2.2. )
= 1 .
7.2.4. .
rk 1
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[W/m2K]
:
Cz [-]
z2
z2
:
z2 < 10;
z2 10;
Cs [-]
:
0,33
0,65
0,2 Pr
dw
d
CC szk
20,01250,91 2zCz1zC
2
3
21
21321
Cs
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:
, :
[W/mK]
(-2, 117 );
d [m] ;
d
s
1
1=d
s 22=
1,51 1sC22
1s
C
22 31=
2
1ttt''
lsr
=
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:
[m/s]
:
Vg [m3/kg]
-sr
[oC]
t1 [
oC] , I t
Qk, I1 1.
F
tVBw
srgr =
273
273
21 lsr =
21ttt
''
lsr
=
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F [m2]
( 2)
[m2/s]
-2, 117
Pr [-] -2, 117
,
:
( 11) < 80, k 7% . k = 1,07 ktab.
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[W/m2K]
:
Cz [-] z2 z2:
z2 < 10 1 < 3;
z2 < 10 1 3;
z2 10;
Cs [-] ;
1 :
0,330,60
Pr
dw
d
CC szk
2,53,12 0,052 zCz1zC
11
2
1 = '
3,24 0,022 zCz
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:
:
22
212
41 '
1,70,1
0,10,34s
C
3131
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:
-
[W/m2K]
-
[W/m2K]
T
T
T
T
TAA
z
z
zor
1
1
2
1
4
3
T
TT
T
TAA
z
z
zor
1
1
2
1
3,6
3
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:
[W/m
2
K
4
]
[K]
:
:
sr,
sr s.
9
1056,7
o
0,8z
AzA
aps
eA 1
psaraaps lppng
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:
[m/s]
:
bar
:
[m]
[]
:
[]
psraaps ng1p
140,9
2
21
d
ss
ds
21TTTT
''
lsr
=
273273 tttT zz
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:
t [oC]
(
)
:
[m2K/W]
:
Cd , 29,
77 ,
Cfr-
:
CCofrd
Ct o80
Ct o60
33,71,181 30RlogCfr
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:
R30 30 m
:
, 29,
77 ,
,
24, 77
:
[m2K/W]
:
[C]
1frC
0,0043
m
v
mv
t
tln
ttt
=
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