1. Brayton cycle with intercooling and reheating HARIKISHNAN PILLAI 130990119042 ENGG THERMODYNAMICS

2. Effects of intercooling on Brayton cycle  Inter cooling means the removal of heat from compressed air between the stages of compression. It is known that the work input in compression is minimum if the compression process is isothermal.  In order to achieve isothermal process compression is divided in number of stages and air is cooled between the stages with help of intercooler.  The greater the number of stages of compression with intercooling between each stage, the closer will be the approximation to an isothermal process.  The intercooler is a heat exchanger in which compressed air is cooled in order to reduce volume and increase density.

3. For ideal cycle with intercooling W c = C p (T 2a -T 1 ) + (T 2 -T 2b ) Heat supplied Qs = C p (T 3 -T 2 ) Work by turbine: W t =C p (T 3 -T 4 ) Thermal efficiency of gas turbine cycle with intercooling:

4. Effect of reheating on brayton cycle  The output of turbine can be increased by increasing enthalpy of gases entering the lower stages. This is achieved by expanding the gases in two stages with reheater between the stages.  Reheating is nothing but kind of increasing the enthalpy of gases

5. Work produced by gas turbine; Work output of HPT + Work output of LPT W T = C p (T 3 -T 4 ) + (T 5 -T 6 ) Work supplied to compressor: W C =C p (T 2 -T 1 ) Heat supplied to gas turbine: Q S = C p (T 3 -T 2 ) + (T 5 -T 4 )