1. An ideal gas turbine (Brayton cycle) has a net power output of 100 kW. The
working medium is air with T1=30°C, T3 = 750°C, and T4 = 300 °C.
Determine
(A) The compressor pressure ratio,
(b) The compressor work (kj/kg),
(c) The mass flow rate of air (kg/s)
(d) The thermal efficiency.
Solution:
a)
b)
c)
d)

2. A gas turbine power plant operates with maximum temperature of 1500⁰C,
while the ambient air temperature is 28⁰C. If specific heat ratio is 1.4 and
pressure ratio is 15, find the following:
Turbine work
Compressor work
Power plant net output work
Heat input
Thermal efficiency
A gas turbine power plant with a pressure ratio of 20:1 consumes 6.2 kg/s of
48MJ/kg methane. If specific heat ratio is 1.5 calculate the output power of
this plant.