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Engineering and Tech / Thermodynamics: An Engineering Approach 8 / Chapter 9 / Problem 99C

Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel

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Chapter 9, Problem 99C

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QUESTION:

A gas turbine for an automobile is designed with a regenerator. Air enters the compressor of this engine at and . The compressor pressure ratio is 10; the maximum cycle temperature is ; and the cold air stream leaves the regenerator cooler than the hot air stream at the inlet of the regenerator. Assuming both the compressor and the turbine to be isentropic, determine the rates of heat addition and rejection for this cycle when it produces . Use constant specific heats at room temperature.

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QUESTION:

A gas turbine for an automobile is designed with a regenerator. Air enters the compressor of this engine at and . The compressor pressure ratio is 10; the maximum cycle temperature is ; and the cold air stream leaves the regenerator cooler than the hot air stream at the inlet of the regenerator. Assuming both the compressor and the turbine to be isentropic, determine the rates of heat addition and rejection for this cycle when it produces . Use constant specific heats at room temperature.

ANSWER:

Step 1 of 7

A Brayton cycle with regeneration produces power.Refer to figure below.

The rates of heat addition and rejection are to be determined.assumptions are

1. The air standard assumptions are applicable.

2. Air is an ideal gas with constant specific heats at room temperature.

3. Kinetic and potential energy changes are negligible.

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