Question

In a gas turbine cycle, the turbine output is 600 kj/kg, the compressor work is 400kj/kg and the heat supplied is 1000 kj/kg. The thermal efficiency of this cycle is:

Answer 1

Given:

Output = 600 kJ / kg

Work = 400 kJ / kg

Heat supplied = 1000 kJ / kg

To find:

Thermal efficiency.

Solution:

By formula,

Net work = Output - Work

Substituting,

We get,

600 - 400

Net work = 200 kj / kg

Thermal efficiency = Net work / Heat supplied

Substituting,

We get,

200 / 1000 * 100

Thermal efficiency = 20 %