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Energies 2013, 6(7), 3149-3166; doi:10.3390/en6073149

Design of a Hydraulic Motor System Driven by Compressed Air

* ,
Department of Power Mechanical Engineering, National Tsing-Hua University, Hsin-Chu City 30013, Taiwan
* Author to whom correspondence should be addressed.
Received: 25 February 2013 / Revised: 18 June 2013 / Accepted: 18 June 2013 / Published: 27 June 2013
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This paper presents the design of a highly efficient pneumatic motor system. The air engine is currently the most generally used device to convert potential energy of compressed air into mechanical energy. However, the efficiency of the air engines is too low to provide sufficient operating range for the vehicle. In this study, the energy contained in compressed air/pressurized hydraulic oil is transformed by a hydraulic motor to mechanical energy to enhance the efficiency of using air power. To evaluate the theoretical efficiency, the principle of balance of energy is applied. The theoretical efficiency of converting air into hydraulic energy is found to be a function of pressure; thus, the maximum converting efficiency can be determined. To confirm the theoretical evaluation, a prototype of the pneumatic hydraulic system is built. The experiment verifies that the theoretical evaluation of the system efficiency is reasonable, and that the layout of the system is determined by the results of theoretical evaluation.
Keywords: air engine; pneumatic engine; hydraulic motor; efficiency; air car engine design air engine; pneumatic engine; hydraulic motor; efficiency; air car engine design
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Shaw, D.; Yu, J.-J.; Chieh, C. Design of a Hydraulic Motor System Driven by Compressed Air. Energies 2013, 6, 3149-3166.

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