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Inventions 2017, 2(4), 35; https://doi.org/10.3390/inventions2040035

Parametric Study of an Air Charged Franchot Engine with Novel Hot and Cold Isothermalizers

School of Engineering, Institute for Energy Systems, University of Edinburgh, Edinburgh EH9 3DW, Scotland, UK
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Received: 19 October 2017 / Revised: 23 November 2017 / Accepted: 1 December 2017 / Published: 5 December 2017
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Abstract

The Stirling engine is an external combustion engine that uses heat exchangers to enhance the addition and removal of energy. This makes the engine power-dense but expensive, less efficient and complicated. In this contribution, the Stirling engine based on the Franchot engine has novel cylindrical fins working as isothermalizers to improve heat transfer without the complications of heat exchangers. Enhancing the power density by isothermalizing work spaces is compared to the bare cylinder optimized by varying the phase angle. The theoretical analysis shows that both the adiabatic and isothermal fins increase the power and efficiency, achieving the Curzon and Ahlborn efficiency at the maximum power point. In comparison to the phase angle method, the finned engine resulted in much lower gas mass flow rate, which leads to a reduction in the regenerator pumping and enthalpy losses. Thus, the Stirling engine has the potential to be simple, cheap, efficient and power-dense, and thus can be used effectively for different applications. View Full-Text
Keywords: Franchot engine; double acting Stirling engine; isothermalizer; heat transfer; phase angle Franchot engine; double acting Stirling engine; isothermalizer; heat transfer; phase angle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Daoud, J.M.; Friedrich, D. Parametric Study of an Air Charged Franchot Engine with Novel Hot and Cold Isothermalizers. Inventions 2017, 2, 35.

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