Cheng cycle

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Note: Conjugate variables in italics

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Work Heat

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Specific heat capacity

c=

$T$	$\partial S$
$N$	$\partial T$

Compressibility

\beta =-

$1$	$\partial V$
$V$	$\partial p$

Thermal expansion

\alpha =

$1$	$\partial V$
$V$	$\partial T$

Equations

Potentials

Internal energy
$U(S,V)$
Enthalpy
$H(S,p)=U+pV$
Helmholtz free energy
$A(T,V)=U-TS$
Gibbs free energy
$G(T,p)=H-TS$

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Book:Thermodynamics

The Cheng cycle is a retrofit to the gas turbine cycle. The Cheng cycle involves the heated exhaust gas from the turbine being used to make steam in a heat recovery steam generator (HRSG).^[1] The steam so produced is injected into the gas turbine's combustion chamber to increase power output.^[2] The process can be thought of as a parallel combination of the gas turbine Brayton cycle and a steam turbine Rankine cycle.^[3]^[4] The cycle was invented by Prof. D. Y. Cheng of the University of Santa Clara who patented it in 1976.^[5]^[6]

References

↑ Penning, F. M. and de Lange, F. M. (1995) Steam Injection: analysis of a typical application Applied Thermal Engineering Vol. 16, No. 2, pp. 115 125
↑ De Paepe, M. and E. Dick (2001) Technological and economical analysis of water recovery in steam injected gas turbines, Applied Thermal Engineering, Volume 21, Issue 2, January 2001, Pages 135–156
↑ Stadler,F. and U. Schneider, (1997) ELIN Cheng Cycle, Elin Energieversorgung GmbH, 1997
↑ Motz,D.A. (1987) The Cheng Cycle: principles and applications, Ass. Energy Engng, 8th World Energy Engng Conf., Atlanta, USA
↑ Cen,Ke-fa Yong Chi, Jianhua Yan (2007) Challenges of Power Engineering and Environment: Proceedings of the International Conference on Power Engineering, Springer (Accessed August 2012)
↑ Cheng, D.Y. and A.L.C. Nelson (2002) Chronological development of the cheng cycle steam injected gas turbine during the past 25 years. in: Anon (Ed.), Proceedings of ASME Turbo Expo 2002, Amsterdam, ASME Paper No. GT-2002-30119 (2002), pp. 421–428

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Cheng cycle

See also

References