A gas turbine engine operates on the ideal Brayton cycle

Chapter 9, Problem 9101

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A gas turbine engine operates on the ideal Brayton cycle with regeneration, as shown in Fig. P999. Now the regenerator is rearranged so that the air streams of states 2 and 5 enter at one end of the regenerator and streams 3 and 6 exit at the other end (i.e., parallel flow arrangement of a heat exchanger). Consider such a system when air enters the compressor at 100 kPa and 208C; the compressor pressure ratio is 7; the maximum cycle temperature is 7278C; and the difference between the hot and cold air stream temperatures is 68C at the end of the regenerator where the cold stream leaves the regenerator. Is the cycle arrangement shown in the figure more or less efficient than this arrangement? Assume both the compressor and the turbine are isentropic, and use constant specific heats at room temperature.

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