Question

19 million Joules of chemical energy are supplied to a boiler in a power plant. 5 x 106 Joules of energy are lost through unburnt fuel. The boiler radiates 1.1 million Joules to the atmosphere. What is the efficiency of the boiler?

Answer 1

Answer:

67.89%

Explanation:

Energy Efficiency=$\frac {U_{energy}}{T_{energy}}\times 100$

Where $U_{energy}$ is useful energy and $T_{energy}$ is the total energy

The useful energy= (19-5-1.1) million= 12.9 million

The total energy= 19 million

$Efficiency=\frac {12.9}{19}\times 100=67.89473684\approx 67.89$

Therefore, the efficiency of the boiler is 67.89%