Energy and exergy analysis of compressed air engine systems
| Autor: | Zhu Yangli, Haisheng Chen, Wen Li, Zhang Xuehui, Zhitao Zuo, Wang Xing |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Exergy
Work (thermodynamics) Work output business.industry Compressed air 020209 energy 02 engineering and technology Energy analysis Turbine Pneumatic motor TK1-9971 Exergy analysis Diesel fuel General Energy 020401 chemical engineering Heat exchanger 0202 electrical engineering electronic engineering information engineering Environmental science Electrical engineering. Electronics. Nuclear engineering 0204 chemical engineering Process engineering business Engine |
| Zdroj: | Energy Reports, Vol 7, Iss, Pp 2316-2323 (2021) |
| ISSN: | 2352-4847 |
| Popis: | In the past decade, compressed air vehicles have attracted much attention because of their zero pollution, high efficiency, environmental friendliness and relative maturity. To further explore the potential of compressed air technology in vehicles, three-stage and four-stage compressed air engine systems are optimized in present study by analyzing the energy and exergy distribution from a technological viewpoint. Their characteristics are compared in terms of shaft work, coolth, overall efficiency, and exergy distribution. Stage expansion ratios differ under maximum work output. The shaft work and coolth of both systems are increased with the increase of working pressure, turbine inlet temperature, or stage efficiency. Three-stage compressed air engine systems have a lower work output and coolth than four-stage compressed air engine systems at given operation condition. The overall efficiencies of these two systems are comparable to those of conventional diesel engines and fuel cell vehicles. Exergy losses of the two systems are composed by the exergy loss in the turbines, heat exchangers, and exits. The analyses suggest that increasing the number of stages, improving stage efficiency, and utilizing coolth to reduce the exergy loss in heat exchangers are effective ways to decrease the total exergy loss and improve the work output and overall efficiency of the compressed air engine systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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