n an ideal Brayton cycle regenerator, the air going to the combustion chamber is heated to the temperature of the air:
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In an ideal Brayton cycle regenerator, the heat from the turbine exhaust is used to preheat the compressed air before it enters the combustion chamber. Show more…
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In large gas-turbine power plants, air is preheated by the exhaust gases in a heat exchanger called the regenerator before it enters the combustion chamber. Air enters the regenerator at 1 MPa and 550 K at a mass flow rate of 800 kg/min. Heat is transferred to the air at a rate of 3200 kJ/s. Exhaust gases enter the regenerator at 140 kPa and 800 K and leave at 130 kPa and 600 K. Treating the exhaust gases as air, determine (a) The exit temperature of the air and (b) The mass flow rate of exhaust gases.
Penny R.
A gas-turbine engine operates on the ideal Brayton cycle with regeneration, as shown in Fig. P9-105. Now the regenerator is rearranged so that the airstreams 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 $100 \mathrm{kPa}$ and $20^{\circ} \mathrm{C}$; the compressor pressure ratio is 7; the maximum cycle temperature is $727^{\circ} \mathrm{C}$; and the difference between the hot and cold airstream temperatures is $6^{\circ} \mathrm{C}$ 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.
An ideal air-standard Brayton cycle includes an ideal regenerator. The state into the compressor is $100 \mathrm{kPa}, 20^{\circ} \mathrm{C},$ and the pressure ratio across the compressor is $12: 1 .$ The highest cycle temperature is $1100^{\circ} \mathrm{C},$ and the air flow rate is $10 \mathrm{~kg} / \mathrm{s}$. Use cold air properties and determine the compressor work, the turbine work, and the thermal efficiency of the cycle.
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