perhitungan
DESCRIPTION
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V
LABORATORIUM MOTOR BAKAR
III.3 ANALISA DATA DAN CONTOH PERHITUNGANSebagai contoh perhitungan diambil data nomor dengan data pengujian sebagai berikut :
N = T =W =
ho =
Tdb =
Twb =
Qpm =
Tip =
Top =
Tgb =
1. Daya Kuda Efektif (BHP)
BHP = (kWatt)
2. Konsumsi Bahan Bakar (FC)
FC=
2. Konsumsi Bahan Bakar Spesifik (SFC)
SFC =
3. Tekanan Efektif Rata-rata (MEP)
MEP = (kPa)
4. Massa Jenis Udara ( ud )
ud =
a. Tekanan Uap Jenuh ( f )
f =
EMBED Equation.3 (mmHg)
b. Tekanan Parsial Uap Air (f )
f = f -
mmHg)
c.Rasio Kelembaban (x)
x =
d.Volume Spesifik Udara Lembab (v)
v =
6. laju Aliran Massa Aktual (Ma)
7.laju Aliran Massa Theoritis (Mth)
8. Perbandingan Udara bahan Bakar (AFR)
9. Faktor Kelebihan Udara ()
10. Efisiensi Volumetrik (vol)
vol
(%)
11.Kalor Total (Qtot)
Qtot =
(kWatt)
12. Efisiensi Thermis (th)
th
(%)
13. Kalor Yang Hilang Akibat Pendinginan Mesin (Qpm)
Qpm = qpm . Cpair . (Top Tip)
(kWatt)
14. Panas Yang Keluar Melalui Gas Buang (Qgb)Mencari nilai mol
Mol CO2=
Mol H2O=
Mol O2=
Mol N2=
Mol produk (Mp)
Mp = mol CO2 + mol H2O + mol O2 + mol N2(mol)
Komposisi Mol (km)
KmCO2 =
KmO2 =
KmH2O =
KmN2 =
Massa produk (Msp)
Msp = (KmCO2. BMCO2) + (KmH2O.BMH2O) + (KmO2.BMO2) + (KmN2.BMN2)
Komposisi berat (kb)
KbCO2 =
KbO2 =
KbH2O =
Kbn2 =
Panas Jenis Molekuler (Cpm)
CpmCO2 =
CpmH2O =
CpmO2 =
CpmN2 =
Cp sebenarnya :
CpCO2 = CpmCO2 .
CpH2O = CpmH2O .
CpO2 = CpmO2 .
CpN2 = CpmN2 .
Cpgb = (CpCO2 + CpH2O + CpO2 + CpN2). 4,186
15. Efisiensi Mekanis
(%)
16. Kehilangan Panas Akibat Faktor Lain ( Qoth )
Qoth = Qtot ( BHP + Qpm + Qfr + Qgb ) (kWatt)
17. Persentase BHP Terhadap Base
%BHPb =
(%)
18. Persentase Terhadap Base
% =
(%)
19. Persentase BHP Terhadap Qtot
%BHP =
(%)
20. Persentase Qpm Terhadap Qtot
%Qpm =
(%)
21. Persentase Qgb Terhadap Qtot
%Qgb =
(%)
22. Persentase Qoth Terhadap Qtot
%Qoth =
(%)
Mesin Diesel I Internal Combustion Engine
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