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Air enters the compressor of a gas-turbine engine at 300 K and 100 kPa, where it is compressed to 700 kPa and 580 K. Heat is transferred to air in the amount of 950 kJ/kg before it enters the turbine. For a turbine efficiency of 86 percent, determine:  (a)  the fraction of turbine work output used to drive the   compressor,  (b)  the thermal efficiency.  Assume:        constant specific heats at 300K.

Air enters the compressor of a gas-turbine engine at 300 K and 100 kPa, where it is compressed to 700 kPa and 580 K. Heat is transferred to air in the amount of 950 kJ/kg before it enters the turbine. For a turbine efficiency of 86 percent, determine:  (a)  the fraction of turbine work output used to drive the   compressor,  (b)  the thermal efficiency.  Assume:        constant specific heats at 300K.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Air enters the compressor of a gas-turbine engine at 300 K and 100 kPa, where it is compressed to 700 kPa and 580 K. Heat is transferred to air in the amount of 950 kJ/kg before it enters the turbine. For a turbine efficiency of 86 percent, determine: 

(a)  the fraction of turbine work output used to drive the   compressor, 

(b)  the thermal efficiency. 

Assume:        constant specific heats at 300K. 

ANS: 50.1%, 29.6%

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