, , . , 20oC , 90C, . (. ).
, , , : , .
, 10oC.
, . ( , ), , , , . , .
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1, .
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EN12828, :
- Va (lt) =
- Vn (lt) =
- Vv (lt) =
- Ve (lt) = ( )
- Po (bar) = ( )
- Pa (bar) = ( )
- Pe (bar) = ( )
- Pst (bar) = ( )
- Psv (bar) =
Vn :
(Ve+Vv) .
, (0,5%) ,
( ),
(Va) .
, :
(Pe) ( ) (psv)
psv 5 bar, 0,5bar
(Po),
PD
0,0 100 ,
0,5 100-110 oC,
1,0 110-120 oC,
:
50kW, 500lt, 90C, 2,5bar (psv) 7m (Pst = 7/10 = 0,7bar)
,
o psv 0,5bar ( 5 bar)
H Pe = Psv - psv = 2,5 - 0,5 = 2bar
pD = 0 ( 100C)
H Po = Pst + pD = 0,7 + 0,0 = 0,7bar
n ( = 3,55)
Ve = Va x n / 100 = 500 x 3,55 / 100 = 17,75 lt
Vv = ( 0,5 / 100 ) x 500 = 2,5lt
Vn = (17,75 + 2,5) lt x [ ( 2 + 1 )bar / ( 2 - 0,7 ) bar ] = 46,73 lt
, 50lt.
online,
.
, , ( ) . ( , , . , , .
, .