Question

In a steam turbine,

the burning of 0.3 kg
of diesel fue
produces 3.6 million
J of energy. What is
the efficiency of the
turbine?​

Answer 1

Efficiency = 0.273 = 27.3%

Step-by-step explanation:

The ideal energy that can be produced by certain mass of diesel fuel is given as follows:

`E_(ideal) = (HV)(m)`

where,

HV = Heating Value of Diesel = 42 - 46 MJ = 44 MJ (Taking average value)

m = mass of diesel fuel = 0.3 kg

E(ideal) = Ideal energy produced by this mass of fuel = ?

Therefore,

`E_(ideal) = (44\ MJ/kg)(0.3\ kg)\\E_(ideal) = 13.2\ MJ\\`

So, the efficiency can be given as:

`Efficiency = (E_(actual))/(E_(ideal))\\\\Efficiency = (3.6\ MJ)/(13.2\ MJ)`

Efficiency = 0.273 = 27.3%