Determine the exit temperature of the inlet air

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Reference no: EM131294682

The inlet air to a gas turbine engine is preheated with the engine's exhaust gases. The preheater is insulated so that all heat transfer is internal. The engine's exhaust gas enters the preheater at 800.°F and 1.30 atm pressure and exits at 500.°F and 1.00 atm. The inlet air enters the preheater at 70.0°F and 1.40 atm and exits at 1.30 atm.

The mass flow rates of the inlet air and the exiting exhaust are approximately the same at 2.10 lbm/s. Both gases can be treated as constant specific heat ideal gases.

The specific heat and gas constant of the exhaust gas are (cp)exh. = 0.238 Btu/(lbm·R) and Rexh. = 0.0640 Btu/ (lbm·R). Neglecting all kinetic and potential energies, and taking the local environment (ground state) as p0 = 1.00 atm, and T0 = 70.0°F, determine:

a. The exit temperature of the inlet air.

b. The second law availability efficiency of the preheater.

Reference no: EM131294682

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