During what stage of a combustion gas turbine can heat recovery take place?
a. Compression
b. Heat addition
c. Expansion
d. Heat rejection
a. Incorrect. During compression, ambient air is drawn into the compressor where it is pressurized.
b. Incorrect. During heat addition, the compressed air then runs through a combustion chamber, where fuel is burned, heating that air—a constant-pressure process, since the chamber is open to flow in and out.
c. Incorrect. During expansion, the heated and pressurized air then gives up its energy, expanding through a turbine.
d. Correct. During heat rejection, heat recovery can take place.
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