This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Exergetic analysis of compressed air for vehicular propulsion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 07, 2008 by SAE International in United States
Annotation ability available
Exergy analysis is a valuable tool for new combustion engine technologies evaluation. By combining both first and second laws of thermodynamics, the availability content of a control system can be precisely calculated, and maximum available work can be determined. One of the main features of exergy evaluation is that it can be performed without knowledge of intrinsic working details of the device being tested.
Compressed air vehicles have been studied in the latter years, and several commercial solutions are being developed. While each developer approaches the problem with a different setup, all must be constrained by the second-law analysis.
In this paper, a theoretical exergy analysis is performed for the compressed air engine, and the exergy content is determined as a function of the storage pressure. The exergy density of a typical compressed air tank is compared to those of hydrocarbons. It is shown that this technology isn't capable of supplying the necessary mileage for a typical light commercial vehicle, unless significant power saving procedures are implemented.
|Technical Paper||Intake and ECM Submodel Improvements for Dynamic SI Engine Models: Examination of Tip-In/Tip-Out|
|Technical Paper||New Mitsubishi V8 20 Liter Diesel Engine|
|Technical Paper||Advanced GDI Injector Control with Extended Dynamic Range|
CitationCarvalho, L., "Exergetic analysis of compressed air for vehicular propulsion," SAE Technical Paper 2008-36-0315, 2008, https://doi.org/10.4271/2008-36-0315.
- RAKOPOULOS, C. D. GIAKOUMIS, E. G. “Second-law analyses applied to internal combustion engines operation” Progress in Energy and Combustion Science 32 2 47 2006
- KNOWLEN, C. MATTICK, BRUCKNER, A. P. HERTZBERG, A. “High Efficiency Energy Conversion Systems for Liquid Nitrogen Automobiles” SAE 981898 1998
- KNOWLEN, C. WILLIAMS, J. MATTICK, A.T. DEPARIS, H. HERTZBERG, A. “Quasi-Isothermal Expansion Engines for Liquid Nitrogen Automotive Propulsion” SAE 972649 1997
- HUANG, K. D. TZENG, S. MA, W. CHANG, W. “Hybrid pneumatic-power system which recycles exhaust gas of an internal-combustion engine” Applied Energy 82 117 132 2005
- HUANG, K. D. TZENG, S. CHANG, W. “Energy-saving hybrid vehicle using a pneumatic-power system” Applied Energy 81 1 18 2005
- HUANG, K. D. TZENG, S. “Development of a hybrid pneumatic-power vehicle” Applied Energy 80 47 59 2005
- ORDONEZ, C. A. “Liquid nitrogen fueled, closed Brayton cycle cryogenic heat engine” Energy Conversion and Management 41 331 341 2000
- U.S. DEPARTMENT OF ENERGY “World Consumption of Primary Energy by Energy Type and Selected Country Groups, 1980-2004” Energy Information Administration 2007
- Automotive Handbook Germany Robert Bosch GmbH 2004