Figure 3 and figure 4 represent the effect of brake power
on the brake thermal efficiency for without EGR and
with EGR condition respectively for all fuel blends. It is
observed that, initially with increasing brake power, the
brake thermal efficiencies for each fuel (diesel,
diesel-biodiesel blends) increased due to reduction in
heat loss and increase in power developed with increase
in load. The maximum brake thermal efficiency was
obtained at around 5.0 to 5.5 kW and then tends to
decrease with further increase of load.