Question

7 A small truck has a four-cylinder, 2.2-liter CI engine that operates on an air-standard Dual 21. At a speed of 2500 RPM, the engine has a volumetric efficiency 7 92 % . At this operating condition, 0.4 % of the carbon in the fuel ends up as soot in the exhaust. In addition, there is 20 % additional carbon soot from the lubricating oil. The amount of soot is then increased by 25% due to other com- cycle using light diesel fuel at an average AF on the carbon. Carbon density pc ponents condensing 1400 kg/m2 Calculate: (a) Rate of soot put into the environment. [kg/hr (b) Chemical power lost in the soot. (Consider the entire mass of soot as (e Number of soot clusters exhausted per hour. Assume that an average cluster contains 2000 spherical carbon particles, and each particle has a diameter of 20 nm. carbon.) [kW

A small truck has a four-cylinder, 2.2-liter CI engine that operates on an air-standard
Dual cycle using light diesel fuel at an average AF = 21:1. At a speed of 2500 RPM, the
engine has a volumetric efficiency is 92%. At this operating condition, 0.4% of the
carbon in the fuel ends up as soot in the exhaust. In addition, there is 20% additional
carbon soot from the lubricating oil. The amount of soot is then increased by 25% due
to other components condensing on the carbon. Carbon density pc = 1400 kglm3
.

Calculate:

(a) Rate of soot put into the environment. [kg/hr]

(b) Chemical power lost in the soot (consider the entire mass of soot as
carbon). [kW]

(c) Number of soot clusters exhausted per hour. Assume that an average
cluster contains 2000 spherical carbon particles, and each particle has a
diameter of 20 nm.

ans : a) 0.0445   b)0.42   c)3.79x10^5

Answer 1

Given data Volume o CI engne Air huel afd z a1:) 41.66 ev/iec Speed - 2500 RPM Uolumetaie ichency tv 9%. Caloone density (400 la Val,N (-B.0022) (d-92 3(41.664) ma O.0498 ka (gec malAf o.0498 kl2ec tor mole ot C12.3H22. tuc 47-6R Caeon houn 22-2 Mays C142-6/169.3)00) - 86.93. . Colon Mas (0.002 3 ec) 0. ec93)6.0094) (1-2) (1.25)( 3600 C o.o 44 S "oot

>mpo Qty= (0.0445(00 kglec3 360 800 - O.42 kwi Ce) o.o44 9/hr O.O000 318 e 1400 km2 T C2ox16 4-19x1m3/at CT Veluyka - oc)(41X16 8.38 X1O m i Fast ea Nunlbe ot clus te 28X1621 m(ctuher 3.79 Acluste/hr L