5213413071.pdf
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NAMA : ASTIARA ANIS DEWANTI NIM : 5213413071 4.1 For steady flow in a heat exchanger at approximately atmospheric pressure, what is the final temperature: (a) When 10 mol of SO2 is heated from 473.15 to 1373.15 K (200 to 1 100°C)? (b) When 12 mol of propane is heated from 523.15 to 1473.15 K (250 to 1200°C)? Diketahui : a. 10 mol SO2 dipanaskan dari 473.15 ke 1373.15 0 K b. 12 mol C3H8 dipanaskan dari 523.15 ke 1473.15 0 K Ditanya : berapakah Q masing-masing (a dan b)? Jawab : a. SO2 A= 5.699, B= 0.801 x 10 -3 , C= 0, D= - 1.015 x 10 -5 = = 1373.15 473.15 = 2.902 = . ∆ = ∫ 0 = [A + B 2 ( + 1) + 3 2 ( 2 + + 1) + 2 ]( − ) = 108.314 [5.699 + 0.801 x 10 −3 2 473.15 (2.902 + 1) − 1.015 x 10 −5 2.902473.15 2 ] (1373.15 − 473.15 ) = 83.14 [6.438](900) = 481760.889 joule = . b. C3H8 A = 1.213, B = 28.785 x 10 -3 , C= -2.164 x 10 -6 = = 1473.15 523.15 = 2.816
Transcript of 5213413071.pdf
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NAMA : ASTIARA ANIS DEWANTI
NIM : 5213413071
4.1 For steady flow in a heat exchanger at approximately atmospheric pressure, what is
the final temperature:
(a) When 10 mol of SO2 is heated from 473.15 to 1373.15 K (200 to 1 100C)?
(b) When 12 mol of propane is heated from 523.15 to 1473.15 K (250 to 1200C)?
Diketahui :
a. 10 mol SO2 dipanaskan dari 473.15 ke 1373.15 0K
b. 12 mol C3H8 dipanaskan dari 523.15 ke 1473.15 0K
Ditanya : berapakah Q masing-masing (a dan b)?
Jawab :
a. SO2
A= 5.699, B= 0.801 x 10-3, C= 0, D= - 1.015 x 10-5
=
=
1373.15
473.15= 2.902
= . =
0
= [A +B
2( + 1) +
32(2 + + 1) +
2]( )
= 108.314 [5.699 +0.801 x 103
2473.15 (2.902 + 1)
1.015 x 105
2.902473.152 ] (1373.15 473.15 )
= 83.14 [6.438](900)
= 481760.889 joule
= .
b. C3H8
A = 1.213, B = 28.785 x 10-3, C= -2.164 x 10-6
=
=
1473.15
523.15 = 2.816
-
= =
0
= [A +B
2( + 1) +
32(2 + + 1) +
2]( )
= 128.314 [1.213 +28.785x 103
2523.15 (2.816 + 1)
2.164 x 106
3 523.152(2.8162 + 2.816 + 1)] (1473.15
523.15 )
= 99.768 [27.626](950)
= 2618426.41 joule
= .
4.3 If 7.08 m3 s-I of air at 322.15 K (50C) and approximately atmospheric pressure is
preheated for a combustion process to 773.15 K (500C), what rate of heat transfer is
required?
Diketahui : jika 7,08 m3 s-1 udara pada suhu 322.15 0K
Proses pembakaran sampai suhu 773.15 0K
Ditanya : berapa kecepatan heat transfer yang diperlukan?
Jawab :
Air
A = 3.355, B = 0.575 x 10-3, C = ....., D = 0,016 x 10-5
Asumsi, = 1.2754
3= 1.2754
103
3, waktu yang dibutuhkan untuk debit air
adalah 1 second, dan Mr udara= 28.84 gr/gr mol
Mencari volume
debit air =volume
waktu
7.08m3
s=
volume
1
-
= . = .
mencari Q
=
=
773.15
322.15= 2.4
= =
0
=
[A +
B
2( + 1) +
32(2 + + 1) +
2]( )
= 1.2754103 7.08 x1068.314
28.84 [3.355 +
0.575 x 103
2 322.15 (2.4 + 1)
0.016x105
2.4322.152 ] (773.15 322.15 )
= 3579.955 [3.67](451)
= 5925434.68 joule
= .
Jadi kecepatan heat transfer yang diperlukan adalah 5925.43468 kj/s
4.4 How much heat is required when 10 000 kg of CaC03 is heated at atmospheric
pressure from 323.15 to 1153.15 K (50C to 880C)?
Diketahui : 10000 kg CaCO3 dipanaskan dari suhu 323.15 0K ke 1153.15 0K
Ditanya : berapakah Q?
Jawab :
CaCO3
A = 12.572, B = 2.637 x 10-3, C= -3.120 x 10-5
Mr= 100
=
=
1153.15
323.15 = 3.568
= =
0
=
[A +
B
2( + 1) +
32(2 + + 1) +
2]( )
-
=10000103
1008.314 [12.572 +
2.637x 103
2323.15 (3.568 + 1)
3.120 x 105
3.568323.152] (1153.15 323.15)
= 831400[14.518](830)
= 1.002 1010 joule
= .
