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Energy Balance
Energy Balance on Compressor...
Author:
Arief Fahmi
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Energy Balance Compressor
25°C, 1 atm
167°C, 3 atm
210 mol/h O2
210 mol/h O2
Component - Oxygen and Nitrogen
O2 ( g ) ∧N 2 (g)at 31 ℃ , 1 atm
Reference State:
^ H¿
n´ ¿
Substance
^ H out
n´ out (kJ/mol)
O2
(mol/h) 210
N2
790
^ H2
(mol/h) 210
^ H1
(kJ/mol)
^ H3 ^ H4
790
H 1 ¿ H 2 is 0 since the condition at standard.
The specific enthalpy of 167
^ O ∆ P+ ∫ CpO dt H 3=V 2
2
25
167
¿ 0.0245 ( 300−100 ) + ∫ 29.10 ×10−3 +1.158 ×10−5 T −0.6076 ×10−8 T 2+1.311× 10−12 T 3 dt 25
[
−5
2
−8
3
1.158 × 10 T 0.6076 × 10 T 1.311 ×10 ¿ 4.9+ 29.10× 10 T + − + 2 3 4 −3
−12
T
4 167
]
25
¿ 4.9+ [ ( 4.8597+0.1615−0.0094+0.0003 )−( 0.7275+0.0036−0.00003+1.28 ×10−7 ) ] ¿ 4.9+ [ 5.0121−0.7311 ] ¿ 9.181
kJ mol
167
^ N ∆ P+ ∫ Cp N dt H 4 =V 2
2
25
167
¿ 0.0245 ( 300−100 ) + ∫ 29 ×10−3 +0.2199 ×10−5 T + 0.5723× 10−8 T 2−2.871 ×10−12 T 3 dt 25
[
0.2199× 10−5 T 2 0.5723 ×10−8 T 3 2.871× 10−12 T 4 ¿ 4.9+ 29× 10 T + + − 2 3 4 −3
167
]
25
−4 −5 −7 ¿ 4.9+ [ ( 4.843+0.0307+ 0.0089−5.58 ×10 )−( 0.7275+0.00007+2.98 ×10 −2.80 ×10 ) ]
¿ 4.9+ [ 4.8820−0.7276 ] ¿ 9.054
kJ mol out
¿
^ i −∑ n´ i ^ ∆ H=¿ ∑ n´ i H Hi i
i
´¿
(
¿ 210
mol kJ mol kJ ×9.181 + 790 ×9.054 −0 h mol h mol
¿ 9080.67
)(
kJ h
)
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