A power plant operates on a simple Brayton cycle. The mass flow rate of air thro

Question

A power plant operates on a simple Brayton cycle. The mass flow rate of air through the cycle is 20 kg/s. Air enters the compressor at T_1 = 37degreeC and p_1 = 100 kPa and is compressed to 1.6 MPa by a compressor. 20 MW of heat is added to the air stream at the heat exchanger. The air is then expanded to 100 kPa by a turbine before rejected to the ambient. Analyze the cycle using the air standard analysis. Which of the following statement is INCORRECT for this cycle? a) This cycle represents a thermodynamic cycle for a jet propulsion engine. b) This is a gas cycle. c) The air standard analysis implies that heat is transferred from an external source instead of burning fuel. d) The power consumption of a compressor in a Brayton cycle is less than the power consumption of a steam turbine pump because average air density is much less than the average liquid density. e) The thermal efficiency of a Bryton cycle will increase with the increasing compressor pressure ratio. Wh

Explanation / Answer

1. e ( = 1 (rp)(1k)/k)

2. c

3. e

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