= 2 . . n
60 = 2 x 3,14 x 1600
60
= 167,4667 ………………………………………….. rads N
e
= T . ώ = 1,201725 x 167,4667
= 40,4387 …………………………………………………….……….. w = 40,4387
1000 = 0,2012489 ……………………………………………….……….. kw
2. Tekanan Udara Yang Masuk Selinder P
a
P
a
= ρ
a
. R . T
a
Pa = tekanan udara = 98658,55 Pa Ra = Konstanta gas ideal = 0,287 kJ kg K
Ta = Temperatur udara = 27
o
C = 300,15 K a = Massa jenis udara kgm
ρ
3
Maka, a = ρ
98658,55 0.287 .300,15
= 1145,287 1000
= 1,14586 ……………………………….. kgm
3
3. Pemakaian Bahan Bakar FC
FC = 3600 . bb . Vbb ρ
t bb = Massa jenis bahan bakar kgm
ρ
3
Vbb = Volume bahan bakar m
3
t = Waktu pemakaian bahan bakar s FC = 3600 x 760 x 0,000004
71
= 0,15414 …………………………………………………….. KgJam
4. Pemakaian Bahan Bakar Spesifik SFC
SFC = F C Ne
= 0,15414 0,2012489
= 0,76592 ……………………………………….……… kgkw.jam
5. Debit Aliran Udara Q
a
Q= π
4 do
2
cd
√
2. g . ρ
oli
. ho. R
a
.T
a
Pa
do = 12 mm = 0.012 m cd = 0,65
g = 9,81 ms
2
oil
= 1100 kgm
3
Ra = 287 Ta = 27
o
C = 300,15 k h
o
= 34 .0,5
1000 =
0.017 m H
2
O Q
a
=
3.14 4
x 0.012
2
x 0.65 x
√
2 x 9.81 x 1100 x 0.017 x 287 x 300,15 98658,55
= 0,000073476 x
√
3160536819 98658,55
= 0,000073476 x 178,983527 = 0,00131 …………………….....……………………….…….. m
3
s
6. Laju Aliran Massa Udara Aktual ma
aktual
ma
actual
= a . Qa . 3600 ρ
a = Massa jenis udara kgm ρ
3
Qa = Debit aliran udara m
3
s = 1,14586 x 0.00131 x 3600
= 5,42491 …………………………………………….. kgjam
7. Laju Aliran Massa Udara Teoritis ma
ideal
ma
ideal
= n2 . 60 . a . V ρ
L
VL = Volume langkah torak = 1,94 x 10
4
0,000194 m
3
ma
ideal
= 16002 x 60 x 1,14586 x 0,000194 = 10,6702 …………………………………..…………. kgjam
8. Perbandingan Udara dan Bahan Bakar AFR
AFR = ma
actual
FC = 5,42491
0,15414
= 35,1945 …………………………………….……… Kg
udara
Kg
bb
9. Persentase Kerugian Panas Yang Dikandung Gas Buang Q
Losses
Q
losses
= Cv . ´ma
aktual
+ FC.Tg−Ta
FC . LHV x 100
Q
losses
= Cv .
´ ma
aktual
+ FC
. Tg−Ta
Tg = Temperatur gas buang = 360 K Ta = Temperatur udara masuk = 300, K
Cv = Panas jenis gas = 1 kgkJ.K LHV = Nilai kalor bahan bakar = 41000 kjkg.k
Sehingga = 1 . 5,42591 + 0,15414
. 360300 0,1541 . 41000
= 334,743 6319,781
= 0,05297 . 100 = 5,29676 …………………………………..……….
10. Efesiensi Volumetrik ην