$9-127$E A gas turbine operates with a regenerator and two

stages of reheating and intercooling. Air enters this engine at

$14$ psia and $60F$; the pressure ratio for each stage of com$-$

pression is $3$ ; the air temperature when entering a turbine is

$940F$; and the regenerator operates perfectly. Determine the

mass flow rate of the air passing through this engine and the

rates of heat addition and rejection when this engine produces

$1000$ hp $.$ Assume isentropic operations for all compressor

and the turbine stages and use constant specific heats at room

temperature.

FIGURE P$9-127$E

$9-128$E Reconsider Prob. $9-127$E$.$ Determine the change

in the rate of heat addition to the cycle when the isentropic

efficiency of each compressor is $88$ percent and that of each

turbine is $93$ percent.