Thermodynamic Analysis of Compressed Air Vehicle Propulsion

by : European Fuel Cell Forum

The fist compressed air vehicles were built by Andraud and Tessié du Motay in
Paris between 1838 and 1840. Since then the idea has been tried again and
again, but has never reached commercialization. In recent years the French
developer MDI has demonstrated advanced compressed air vehicles. However,
the claimed performance has been questioned by car manufacturers and
automobile expert. Basically, when referred to ambient conditions, the relatively
low energy content of the compressed air in a tank of acceptable volume is
claimed to be insufficient to move even small cars over meaningful distances

On the other hand, another air car developer claims to have driven 184 km on
one 300 Liter filled with air at initially 300 bar pressure. Obviously, there are
issues to be resolved, not by heated debates, but by an analysis of the
thermodynamic processes involved. This is the aim of this study

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http://www.efcf.com/reports/E14.pdf

Thermodynamic Properties of Liquid Alkali Metals Using a Charged Hard, Sphere Reference System

this journal now available and free download able at Chinese journal of physics, written by P. B. Thakor, V. N. Patel, P. N. Gajjar, and A. R. Jani from Department of Physics, Sardar Patel University, Gujarat, India, introduce The Gibbs-Bogoliubov (GB) inequality, the experiment results : Structure of liquid metals,Thermodynamic properties,Pseudopotential method.

abstraction

The Gibbs-Bogoliubov (GB) inequality is used to evaluate the Helmholtz free energy of
liquid alkali metals as a function of temperature. The structural contribution to the Helmholtz free energy is investigated by adopting a charged hard sphere fluid model. A well established single parametric local pseudopotential is applied to describe the electron-ion interaction along with five different local field correction functions viz; Hartree, Taylor, Ichimaru and Utsumi, Farid et al., and Sarkar et al., 6.2% to 51.15% of the influence on the Helmholtz free energy is concluded to be due to these local field correction functions with respect to the static Hartree dielectric function. Very good agreement with experimental results is achieved.
PACS. 61.25.M – Structure of liquid metals.
PACS. 65.50.+m – Thermodynamic properties.
PACS. 71.15.Hx – Pseudopotential method.

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http://psroc.phys.ntu.edu.tw/cjp/v40/404.pdf

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