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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