Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments

The paper presents experimental tests and theoretical studies of a Stirling engine cycle applied to a <i>β</i>-type machine. The finite physical dimension thermodynamics (FPDT) method and 0D modeling by the imperfectly regenerated Schmidt model are used to develop analytical models for t...

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Main Authors: Cătălina Dobre, Lavinia Grosu, Monica Costea, Mihaela Constantin
Format: Article
Language:English
Published: MDPI AG 2020-11-01
Series:Entropy
Subjects:
Online Access:https://www.mdpi.com/1099-4300/22/11/1278
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spelling doaj-f369b900d0154435a2f776d8679834902020-11-25T03:57:39ZengMDPI AGEntropy1099-43002020-11-01221278127810.3390/e22111278Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to ExperimentsCătălina Dobre0Lavinia Grosu1Monica Costea2Mihaela Constantin3Department of Engineering Thermodynamics, Engines, Thermal and Refrigeration Equipments, University Politehnica of Bucharest, Splaiul Independenței 313, 060042 Bucharest, RomaniaLaboratory of Energy, Mechanics and Electromagnetic, Paris West Nanterre La Défense University, 50, Rue de Sèvres, 92410 Ville d’Avray, FranceDepartment of Engineering Thermodynamics, Engines, Thermal and Refrigeration Equipments, University Politehnica of Bucharest, Splaiul Independenței 313, 060042 Bucharest, RomaniaDepartment of Engineering Thermodynamics, Engines, Thermal and Refrigeration Equipments, University Politehnica of Bucharest, Splaiul Independenței 313, 060042 Bucharest, RomaniaThe paper presents experimental tests and theoretical studies of a Stirling engine cycle applied to a <i>β</i>-type machine. The finite physical dimension thermodynamics (FPDT) method and 0D modeling by the imperfectly regenerated Schmidt model are used to develop analytical models for the Stirling engine cycle. The purpose of this study is to show that two simple models that take into account only the irreversibility due to temperature difference in the heat exchangers and imperfect regeneration are able to indicate engine behavior. The share of energy loss for each is determined using these two models as well as the experimental results of a particular engine. The energies exchanged by the working gas are expressed according to the practical parameters, which are necessary for the engineer during the entire project, namely the maximum pressure, the maximum volume, the compression ratio, the temperature of the heat sources, etc. The numerical model allows for evaluation of the energy processes according to the angle of the crankshaft (kinematic–thermodynamic coupling). The theoretical results are compared with the experimental research. The effect of the engine rotation speed on the power and efficiency of the actual operating machine is highlighted. The two methods show a similar variation in performance, although heat loss due to imperfect regeneration is evaluated differently.https://www.mdpi.com/1099-4300/22/11/1278imperfect regenerationnumerical modelStirling enginethermodynamic analysis
collection DOAJ
language English
format Article
sources DOAJ
author Cătălina Dobre
Lavinia Grosu
Monica Costea
Mihaela Constantin
spellingShingle Cătălina Dobre
Lavinia Grosu
Monica Costea
Mihaela Constantin
Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
Entropy
imperfect regeneration
numerical model
Stirling engine
thermodynamic analysis
author_facet Cătălina Dobre
Lavinia Grosu
Monica Costea
Mihaela Constantin
author_sort Cătălina Dobre
title Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
title_short Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
title_full Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
title_fullStr Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
title_full_unstemmed Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments
title_sort beta type stirling engine. schmidt and finite physical dimensions thermodynamics methods faced to experiments
publisher MDPI AG
series Entropy
issn 1099-4300
publishDate 2020-11-01
description The paper presents experimental tests and theoretical studies of a Stirling engine cycle applied to a <i>β</i>-type machine. The finite physical dimension thermodynamics (FPDT) method and 0D modeling by the imperfectly regenerated Schmidt model are used to develop analytical models for the Stirling engine cycle. The purpose of this study is to show that two simple models that take into account only the irreversibility due to temperature difference in the heat exchangers and imperfect regeneration are able to indicate engine behavior. The share of energy loss for each is determined using these two models as well as the experimental results of a particular engine. The energies exchanged by the working gas are expressed according to the practical parameters, which are necessary for the engineer during the entire project, namely the maximum pressure, the maximum volume, the compression ratio, the temperature of the heat sources, etc. The numerical model allows for evaluation of the energy processes according to the angle of the crankshaft (kinematic–thermodynamic coupling). The theoretical results are compared with the experimental research. The effect of the engine rotation speed on the power and efficiency of the actual operating machine is highlighted. The two methods show a similar variation in performance, although heat loss due to imperfect regeneration is evaluated differently.
topic imperfect regeneration
numerical model
Stirling engine
thermodynamic analysis
url https://www.mdpi.com/1099-4300/22/11/1278
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