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Design Innovation

Valved Heat Engine Working on Modified Atkinson Cycle

[+] Author and Article Information
C. V. Ramesh

Retd. Head of Department Mech. Eng., Golden Valley Institute of Engineering, KGF, 563115, India

J. Energy Resour. Technol 132(1), 015001 (Feb 23, 2010) (4 pages) doi:10.1115/1.4000921 History: Received November 20, 2008; Revised December 14, 2009; Published February 23, 2010; Online February 23, 2010

There is immense scope for the development of heat engines that can directly convert solar and biochemical renewable sources of thermal energy to high-grade energy. Regenerative Stirling cycle heat engine with its performance criteria of highest thermal efficiency and high mean effective pressure is theoretically the best engine for small capacity reciprocating heat engine. However, the practical Stirling engine performance is far from the ideal. As an alternative, practical heat engines based on thermodynamic cycles (without regeneration) other than the Stirling cycle have been suggested. This paper deals with a new concept in the design of reciprocating heat engine working on modified Atkinson cycle. In the Atkinson cycle, expansion ratio being higher than compression ratio, the thermal efficiency is better than that of the standard Otto cycle. Heat engine design based on the suggested modified Atkinson cycle can be an alternative to the practical Stirling engine. In the conceptual mechanical design of the engine suggested here, apart from utilizing the principle of Atkinson cycle for achieving higher thermal efficiency, the mechanical configuration of the reciprocating engine ensures a high degree of inertial force balancing. This can result in reduced vibrations in the mountings of the power units.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

PV and Ts diagrams for the Otto and Atkinson cycles

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Figure 2

Arrangement of cylinders

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Figure 3

Heat input Q and compression temperature T2 versus compression ratio rc and variation in re with rc, for a temperature ratio 2.5

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Figure 4

Work output versus compression ratio rc for a temperature ratio of 2.5

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Figure 5

Thermal efficiency versus compression ratio rc a for temperature ratio of 2.5

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Figure 6

PV and Ts diagrams for the practical Atkinson cycle

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