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

67.89%

Step-by-step explanation:

Energy Efficiency=
`\frac {U_(energy)}{T_(energy)}* 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}* 100=67.89473684\approx 67.89`

Therefore, the efficiency of the boiler is 67.89%