![]() ![]() The net heat rejected is given by Q re = H 4 – H 1Īs can be seen, we can describe and calculate (e.g., thermodynamic efficiency) such cycles (similarly for Rankine cycle) using enthalpies. Isobaric heat rejection – the residual heat must be rejected to close the cycle.The work done by the turbine is given by W T = H 4 – H 3 Isentropic expansion – the heated, pressurized air then expands on a turbine, gives up its energy.The net heat added is given by Q add = H 3 – H 2 It is a constant-pressure process since the chamber is open to flow in and out. Isobaric heat addition – the compressed air then runs through a combustion chamber, where fuel is burned and air or another medium is heated (2 → 3). ![]() The work required for the compressor is given by W C = H 2 – H 1. Isentropic compression – ambient air is drawn into the compressor, where it is pressurized (1 → 2). Two isentropic processes and two isobaric processes.
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