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Performance enhancement of regenerative gas turbine: air bottoming combined cycle using bypass valve and heat exchanger—energy and exergy analysis

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Abstract

The present investigation is the comparative energy and exergy analysis of a proposed gas turbine (PGT) cycle with a simple gas turbine (SGT) cycle while maintaining the same mass flow rate of fuel in both cycles. In the PGT cycle, a bypass valve (BVP) connects the topping regenerative gas turbine cycle with the air bottoming cycle. It is found that with increase in pressure ratio (rp), turbine inlet temperature (TIT) of topping cycle of PGT cycle decreases continuously in the absence of the BPV, whereas in the PGT cycle with the BVP, the net output and thermal efficiency increased by 20% at rp = 12 and TIT = 900 K to 81% at rp = 4 and TIT = 1000 K. SFC of PGT cycle is reduced by 43–45% for TIT = 900 K and 1000 K, respectively, at rp = 4 as compared to SGT cycle. Also the total exergy destruction and exergetic efficiency of SGT cycle are 62.1–55% less and 26.5–49.7% more, respectively, in contrast to PGT cycle. In addition to this, the exhaust gas exergy losses decrease by 75.5% at the maximum output as compared to the SGT cycle.

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Abbreviations

\(W\) :

Work output

T :

Temperature (K)

\(\varepsilon\) :

Heat exchanger effectiveness

\(r_{\text{p}}\) :

Pressure ratio

BPV:

Bypass valve

SFC:

Specific fuel consumption

PGT:

Proposed gas turbine

TIT:

Topping gas turbine inlet temperature (K)

\(\dot{Q}\) :

Heat supply rate

\(\dot{m}\) :

Mass flow rate (kg s−1)

\(\eta\) :

Thermal efficiency

LCV:

Lower calorific value of fuel

\(PGT\) :

Proposed gas turbine

HE:

Heat exchanger

SGT:

Simple gas turbine

t :

Topping cycle

c :

Compressor

b :

Bottoming cycle

a :

Air

T :

Turbine

Comb.:

Combined

net:

Net

f :

Fuel

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Acknowledgements

The author acknowledges the Deanship of Scientific Research (DSR) at Majmaah University, Majmaah, Saudi Arabia, for technical and financial support through vote number 38/111, 2017–2018, for this research project.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, College of Engineering, Majmaah University, Al-Majmaah, 11952, Saudi Arabia

    M. N. Khan

  2. Department of Mechatronics and System Engineering, College of Engineering, Majmaah University, Al-Majmaah, 11952, Saudi Arabia

    Tawfeeq Abdullah Alkanhal

  3. Department of Computer Science, College of Science and Humanities at AlGhat, Majmaah University, P.O. Box 66, Al-Majmaah, 11952, Saudi Arabia

    Jihen Majdoubi

  4. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Iskander Tlili

  5. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam

    Iskander Tlili

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Khan, M.N., Alkanhal, T.A., Majdoubi, J. et al. Performance enhancement of regenerative gas turbine: air bottoming combined cycle using bypass valve and heat exchanger—energy and exergy analysis. J Therm Anal Calorim 144, 821–834 (2021). https://doi.org/10.1007/s10973-020-09550-w

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