Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation

Since 2001, Frauscher Thermal Motors have been conducting research in the field of thermodynamic machines, in particular Stirling engines of various types. One important development step is the invention of a Stirling engine in an alphagamma® configuration. In this configuration, the expansion pisto...

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Autores principales:	Frauscher Josef, Diermaier Franz, Brandt Hans-Jürgen, Gschwendtner Michael
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/006c6ff744e345d5ac22280ad16fd36d
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spelling	oai:doaj.org-article:006c6ff744e345d5ac22280ad16fd36d2021-11-08T15:18:57ZStirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation2267-124210.1051/e3sconf/202131308006https://doaj.org/article/006c6ff744e345d5ac22280ad16fd36d2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/89/e3sconf_isec2021_08006.pdfhttps://doaj.org/toc/2267-1242Since 2001, Frauscher Thermal Motors have been conducting research in the field of thermodynamic machines, in particular Stirling engines of various types. One important development step is the invention of a Stirling engine in an alphagamma® configuration. In this configuration, the expansion piston is designed as a differential piston with its ring surface connected to the cold volume. In this paper, the design advantages of the alphagamma® configuration in comparison with a traditional alpha configuration are shown analytically by using a polytropic model as a modification of the ideal adiabatic analysis. The findings were confirmed by also simulating the proposed alphagamma® configuration in a Sage model which was validated against experimental data with very good agreement. The results of both methods show that the counter-productive compression work can be reduced to almost zero – which makes the compression piston a displacer and explains the name alphagamma® – with the expansion work also reduced for the same net work output. As a consequence, the forces on the pistons, and thus, on the bearings can be significantly reduced, also leading to smaller piston side-loads, less friction and wear. The combination of all advantages allows the design of a mechanically sound and inexpensive machine.Frauscher JosefDiermaier FranzBrandt Hans-JürgenGschwendtner MichaelEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 313, p 08006 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Frauscher Josef Diermaier Franz Brandt Hans-Jürgen Gschwendtner Michael Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
description	Since 2001, Frauscher Thermal Motors have been conducting research in the field of thermodynamic machines, in particular Stirling engines of various types. One important development step is the invention of a Stirling engine in an alphagamma® configuration. In this configuration, the expansion piston is designed as a differential piston with its ring surface connected to the cold volume. In this paper, the design advantages of the alphagamma® configuration in comparison with a traditional alpha configuration are shown analytically by using a polytropic model as a modification of the ideal adiabatic analysis. The findings were confirmed by also simulating the proposed alphagamma® configuration in a Sage model which was validated against experimental data with very good agreement. The results of both methods show that the counter-productive compression work can be reduced to almost zero – which makes the compression piston a displacer and explains the name alphagamma® – with the expansion work also reduced for the same net work output. As a consequence, the forces on the pistons, and thus, on the bearings can be significantly reduced, also leading to smaller piston side-loads, less friction and wear. The combination of all advantages allows the design of a mechanically sound and inexpensive machine.
format	article
author	Frauscher Josef Diermaier Franz Brandt Hans-Jürgen Gschwendtner Michael
author_facet	Frauscher Josef Diermaier Franz Brandt Hans-Jürgen Gschwendtner Michael
author_sort	Frauscher Josef
title	Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
title_short	Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
title_full	Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
title_fullStr	Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
title_full_unstemmed	Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation
title_sort	stirling-engine in a novel alphagamma configuration – a key for maintenance-free operation
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/006c6ff744e345d5ac22280ad16fd36d
work_keys_str_mv	AT frauscherjosef stirlingengineinanovelalphagammaconfigurationakeyformaintenancefreeoperation AT diermaierfranz stirlingengineinanovelalphagammaconfigurationakeyformaintenancefreeoperation AT brandthansjurgen stirlingengineinanovelalphagammaconfigurationakeyformaintenancefreeoperation AT gschwendtnermichael stirlingengineinanovelalphagammaconfigurationakeyformaintenancefreeoperation
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Stirling-Engine in a Novel Alphagamma Configuration – a Key for Maintenance-free Operation

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