Kurva ISL
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Transcript of Kurva ISL
![Page 1: Kurva ISL](https://reader036.fdocument.pub/reader036/viewer/2022082400/549167c1b47959640d8b5577/html5/thumbnails/1.jpg)
Kurva ISL model BET
SoalERH (%) Kadar air (%)
11,3232,5243,263,8883,72
3,389,069,2115,5522,06
a) Tentukan Ka lapis tunggalb) Grafik sorpsi-isotermi
Jawab :
awM (1−aw)
= 1M 1.C
+ C−1M 1.C
aw
Keterangan : aw = aktivitas air M = kadar air M1 = kadar air lapis tunggal C = konstanta
Analogi dengan y = A+ BxDimana y = aw/(M(1-aw))
x = awA = 1/(M1.C)B = (C-1)/(M1.C)Aw = ERH/1000
Tabel Hubungan Aw dan Kadar air
x = aw M = kadar air (%) y = aw/(M(1-aw))0,1132 3,38 0,03780,3252 9,06 0,05320,432 9,21 0,0826
0,6388 15,55 0,11370,8372 22,06 0,2331
![Page 2: Kurva ISL](https://reader036.fdocument.pub/reader036/viewer/2022082400/549167c1b47959640d8b5577/html5/thumbnails/2.jpg)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90.0000
0.0500
0.1000
0.1500
0.2000
0.2500
Hubungan Aw dan Kadar Air
Aw
Kada
r Air
(%)
Pada grafik, dihasilkan nilai x dan yy = 0,258 x – 0,017R2 = 0,863 Sehingga diperoleh A= -0,017 dan B= 0,258
Maka, A= 1(M 1.C) = -0,017
C= 1−0,017.M 1
................................(1)
B = (C−1)(M 1.C) = 0,258..........................(2)
Persamaan (1) disubstitusikan ke persamaan (2)
C= 1−0,017.M 1
B = (C−1 )
(M 1.C )
[( 1
−0,017.M 1 )−1]M 1.( 1
−0,017.M 1 ) = 0,258
1−0,017.M 1 = 0,258 ( 1
−0,017.M 1 ) + 1
1−0,017.M 1
= -14,177
1 = 0,241 M1
M1 = 4,15a) Kadar air lapis tunggalnya adalah 4,15 %
C= 1−0,017.M 1
= 1−0,017 x 4,15
= -14,17
![Page 3: Kurva ISL](https://reader036.fdocument.pub/reader036/viewer/2022082400/549167c1b47959640d8b5577/html5/thumbnails/3.jpg)
b) Rumus Pembuatan Kurvaaw
M (1−aw )= 1M 1.C
+ C−1M 1.C
aw
1. Prediksi
x M y0,1 12,626 0,0090,2 7,225 0,0350,3 7,096 0,0600,4 7,734 0,0860,5 8,929 0,1120,6 10,885 0,1380,7 14,262 0,1640,8 21,119 0,1890,9 41,822 0,215
2. Observasi
x y0,1132 3,380,3252 9,06
0,432 9,210,6388 15,550,8372 22,06
Kurva ISL prediksi dan observasi
![Page 4: Kurva ISL](https://reader036.fdocument.pub/reader036/viewer/2022082400/549167c1b47959640d8b5577/html5/thumbnails/4.jpg)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
15
20
25
30
35
40
45
Hubungan Kadar Air dan Aw
ObservasiPrediksi
Aw
Kada
r Air
(%)