Energy and Exergy Analysis of Moist Air for Application in Power Plants

Martín Salazar-Pereyra, Miguel Toledo-Velázquez, G. Tolentino Eslava, Raúl Lugo-Leyte, Celerino Reséndiz Rosas

.

DOI: 10.4236/epe.2011.33048                

Abstract

In this study an energy and exergy analysis is made of moist air, it is used the psychometrics charts. A Visual Basic program is used to generate psychometrics charts. These charts are used to analyze the air thermodynamic behavior, considering the environmental variations, pressure, temperature and relative humidity. Also, the available energy in the cooling processes at constant enthalpy, humidification at constant temperature and heating with constant relative humidity is analyzed. For example, we obtained that the enthalpy and exergy in a thermodynamic state, with conditions, P_atm = 1.013 bar, T_atm = 25^oC and Φ_atm=50%, are h = 50.56 kJ/kg_a and ε =11.5 kJ/kg_a; and for P_atm= 0.77 bar to the same conditions of T_atm and Φ_atm, the enthalpy and exergy increases in a 14% and 20%, respectively.

Keywords

Energy Analysis, Exergy Analysis, Moist Air, Power Plants

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	K. H. Kim and H. Pérez-Blanco, “Potential of Regenerative Gas-Turbine Systems with High Fogging Compression,” Applied Energy, Vol. 84, No. 1, 2007, pp. 16-28. doi:10.1016/j.apenergy.2006.04.008
[2]	F. R. P. Arrieta, “In?uence of Ambient temperature on Combined-Cycle Power-Plant Performance,” Applied Energy, Vol. 80, No. 3, 2005, pp. 261-272. doi:10.1016/j.apenergy.2004.04.007
[3]	T. J. Kotas, “The Exergy Method of Thermal Plant Analysis,” 1st Edition, Krieger Pub Co., Malabar, 1995.
[4]	P. E. Liley, “Flow Exergy of Moist Air,” Exergy, Vol. 2, No. 1, 2002, pp. 55-57.
[5]	M. J. Moran and E. Sciubba, “Exergy Analysis: Principles and Practice,” Journal of Engineering for Gas Turbines and Power, Vol. 116, No. 2, 1994, pp. 285-290. doi:10.1115/1.2906818
[6]	W. A. Hermann, “Quantifying Global Exergy Resources,” Energy, Vol. 31, No. 12, 2006, pp. 1349-1366.
[7]	I. Dincer and M. C. Rosen, “Exergy Energy, Environment and Sustainable Development Sustainable Development,” 1st Edition, Elsevier Science, Amsterdam, 2007, pp. 76-89.
[8]	A. Bejan, “Advenced Engineering Thermodynamics,” 3rd Edition, John Wiley & Sons, Hoboken, 2006, pp. 213-221.
[9]	G. Tsatsaronis, “Thermoeconomic Analysis and Optimization of Energy Systems,” Progress in Energy and Combustion Science, Vol. 19, No. 3, 1993, pp. 227-257. doi:10.1016/0360-1285(93)90016-8