Page 444 - Advances in Eco-Fuels for a Sustainable Environment

Assessment of performance and emission behavior of novel annona 397

smoke along with brake power are studied. The readings are taken with neat diesel for
ensuing the baseline performance to compare with all other operating methods
involved in the present investigation.

14.3.2 Brake thermal efficiency
In general, BTE is the ratio of the brake power obtained from the engine to the fuel
energy supplied to the engine. The BTE will determine how efficiently the heat is
converted into work. The BTE purely depends upon the engine design, type of fuel,
and engine application.
Fig. 14.2 shows the variation of BTE with brake power for different proportions of
AME diesel blends and diesel. It is observed from Fig. 14.2 that the BTE increases
with BP for all AME-diesel blends at all loads. Among the different blends, A20
shows better BTE than that of other blends. It is found that the BTE for A20 is
30% and for diesel is 31% at maximum load. The reason for the reduction of BTE
is due to lower heating value, low air fuel mixing, higher viscosity, and higher density
of biodiesel when compared to that of diesel [29]. The lower BTE can also be attrib-
uted to higher BSFC. Further, the oxygen content increases with increasing the per-
centage of AME-diesel blends, which reduces the heating value and in turn lowers
the BTE.

14.3.3 Brake specific fuel consumption

BSFC is the measurement of efficiency of fuel by the engine that combusts the fuel air
mixture and produces the rotational motion of the crankshaft. This is used for com-
paring the efficiency of the engine. BSFC is the ratio of the rate of fuel consumption
and the effective power produced from the engine.

35

30
25
Diesel
BTE(%) 20 A20
A40
15
A60
10
A80
5 A100

0
0 1 2 3 4 5 6
BP(kW)
Fig. 14.2 Variation of BTE with BP for diesel and different proportions of AME diesel blends.