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Brake power (W or kW).
A crankshaft mechanism was installed with flywheel and rope brake dynamometer to measure engine brake power.
This provides estimate of net heat input, net brake power and cooling duty.
During NRTC the brake power, PM and PN decreased with fuel oxygen content.
Indicated power, friction power and brake power were measured and the maximum brake power output was obtained with helium at 550 °C heat source temperature and 10-bar charge pressure at 700 rpm as 96.7 W.
Appropriate boost pressures to produce the same brake power at a given relative air/fuel ratio of 1.1 without boost were determined for each relative air/fuel ratio or each biogas composition considering brake power.
Indicated power, friction power and brake power were measured and maximum brake power output was obtained with helium at 550˚C heat source temperature and 10 bar charge pressure at 700 rpm as 96.7 W.
The brake power, brake thermal efficiency, and NOx emissions increased as the CH4 content or the boost pressure increased.
As expected, working at a higher compression ratio turned out to be more efficient and also yielded higher brake power.
A maximum brake power of 17.5 kWe was obtained at an overall efficiency of 21% at the highest compression ratio.
According to the results, the brake power and brake thermal efficiency were increased by means of hydrogen addition.
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