Question

In an engine performance test, two types of fuel are being used.They are diesel (D2) and

biodiesel (B20).Tests were performed at 2500 rpm by using a four cylinder diesel engine

with a diameter of 82.2 mm and 94.0 mm stroke size.Tests data are tabulated in Table 1

Table 1

Properties & test data	Diesel (D2)	Biodiesel (B20)
Calorific value, (MJ/kg)	45.609	44.197
Viscosity @ 40°C, (mPa.s)	3.743	4.299
Density, (kg/m³)	838	850
Tourque, (Nm)	230	221
Fuel flowrate, (kg/hr)	12.89	13.46

By using the tests data inTable 1, determine for both type of fuels the:

I. Brake power (KW)

II. Brake specific fuel consumptions (kg/kW.hr)

III. Brake thermal efficiency (%)

Compare the answers obtained for B2 and D2.Discuss why the performance varies

based on the properties of the fuels.

Answer 1

Soluhon Ba ake PowerlBP) S.P.CA) ITNT 60-206 33 1X3s00x330 7ess Ku 60 60 B.P CB30)- 3NT2 60 1X 8500XR1 850 433 kus 60 Brake gpecic fuel consumphon B-S.F.C 1R.89X3600 60306-33 o.77 (D 8f Kaohr (B.SP.C) BRO) 0.837 tg 13-46X360o BP2 Kobr $2850.433 Brake thermal perfer thiciemey) 10-24 B.P 6020683 13.89X45 609 B.P2 9.7% 4E489 S7.85 13.&6x 44.197 1st esulk. os. Ton9u of (a) geatr same them Com paring than CR) all other parameturs ase (B)f (a) will be Andgesul 9seaha than (B-Ro) B-S-F.C d mt BP BP Jess than (BS-Fe )ay B-20 and seatr than honse BFC f (Dr) eakr BPamd ev, nth af geeat