- - - , , Tx2.
Tx2 q ;
. 5.9. - - .
ΔT. Δ T
Ä T =(Tr 1- Tx 2) - (Tr 2 - Tx 1)
(5.4)
T - T
ln r 1 x 2
Tr 2 - Tx 1
Δ T
T
,
, Tx2. Tx2
.
T
, -
.
l
⎛ T 1
⎜⎜
- T
2 ⎞
⎟⎟< 4,
. 5.10. -
⎝ T 2 - T 1 ⎠
.
- :
Ä T
=(Tr 1 - Tx 2) - (Tr 2 - Tx 1)
2
(5.5)
10 %.
q = KA Ä T
q = KA (Tr 1 - Tx 2) - (Tr 2 - Tx 1), (5.6)
K ; A .
Tx2 , .
:
q -
q = cF (Tr 1 - Tr 2); (5.7)
q = cF (Tx 1- Tx 2), (5.8)
c c , F F .
Tx2 T2 (5.6)
KA ⎧ ⎡
q ⎤ ⎡
q ⎤ ⎫
q = 2 ⎨ Tr 1 - ⎢ Tx 1 + c F
⎥ +⎢ Tr 1 - c F
⎥ - Tx 1 ⎬
⎩ ⎣
⎦ ⎣
⎦ ⎭
q = Tr 1 - Tx 1
(5.9)
1 1 ⎛ 1
+ ⎜⎜
1 ⎞
+ ⎟⎟
KA 2 ⎝ cxF
c F ⎠
(5.8) (5.9), -
Tx 2 - Tx 1 = 1
(5.10)
T - T c F 1 ⎛ c F ⎞
r 1 x 1 + ⎜⎜1 + ⎟⎟
KA 2 ⎝
c F ⎠
. 5.11, Tx2.
|
|
1,0 1,0
T 2 - T 1 Tr 1 - T 1
0,5
c F KA
T 2 - T 1 Tr 1 - T 1
4
0,5
0 2 4
c F KA
. 5.11. Tx2 - () ()
, Tx2 F F. - , - Tx2 , . 41, , - F.
(. 5.11), , Tx2 , . - , .
, . -
. , , - . , ό ( ) . - .
- - q
q = rF, (5.11)
r ; F .
, - .
-
. 5.12.
- .
.
- , - . - , - - , , . ,
, - - .
. 5.13. ().
, -
, , - . 5-7 %. , , , .
|
|
TRC
PRC
. 5.14. ; .
- - - . , - , .
,
,
. 5.15. - - .
. (. 5.16, ) - . . (. 5.16, ) , - . , , , -
, . .
()
. 5.16. - () ().