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Development and validation of a thermodynamic model for the performance analysis of a gamma Stirling engine prototype
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Universidad Mayor de San Simon (UMSS), Bolivia.ORCID iD: 0000-0002-9254-3453
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. Universidad Mayor de San Simon (UMSS), Bolivia.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3950-0809
Universidad Mayor de San Simon (UMSS), Bolivia.
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2015 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 83, 16-30 p., 6439Article in journal (Refereed) Published
Abstract [en]

This work presents the development and validation of a numerical model that represents the performance of a gamma Stirling engine prototype. The model follows a modular approach considering ideal adiabatic working spaces; limited internal and external heat transfer through the heat exchangers; and mechanical and thermal losses during the cycle. In addition, it includes the calculation of the mechanical efficiency taking into account the crank mechanism effectiveness and the forced work during the cycle. Consequently, the model aims to predict the work that can be effectively taken from the shaft. The model was compared with experimental data obtained in an experimental rig built for the engine prototype. The results showed an acceptable degree of accuracy when comparing with the experimental data, with errors ranging from +/- 1% to +/- 8% for the temperature in the heater side, less than +/- 1% error for the cooler temperatures, and +/- 1 to +/- 8% for the brake power calculations. Therefore, the model was probed adequate for study of the prototype performance. In addition, the results of the simulation reflected the limited performance obtained during the prototype experiments, and a first analysis of the results attributed this to the forced work during the cycle. The implemented model is the basis for a subsequent parametric analysis that will complement the results presented.

Place, publisher, year, edition, pages
2015. Vol. 83, 16-30 p., 6439
Keyword [en]
Energy technology, Simulation and modelling, Stirling engine, Thermodynamic analysis
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-163046DOI: 10.1016/j.applthermaleng.2015.03.006ISI: 000355349700003Scopus ID: 2-s2.0-84925614881OAI: oai:DiVA.org:kth-163046DiVA: diva2:798495
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20150817. Updated from e-pub head of print to published.

Available from: 2015-03-26 Created: 2015-03-26 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Thermodynamic analysis of Stirling engine systems: Applications for combined heat and power
Open this publication in new window or tab >>Thermodynamic analysis of Stirling engine systems: Applications for combined heat and power
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increasing energy demands and environmental problems require innovative systems for electrical and thermal energy production. In this scenario, the development of small scale energy systems has become an interesting alternative to the conventional large scale centralized plants. Among these alternatives, small scale combined heat and power (CHP) plants based on Stirling Engines (SE) have attracted the interest among research and industry due to the potential advantages that offers. These include low maintenance, low noise during operation, a theoretically high electrical efficiency, and principally the fuel flexibility that the system offers. However, actual engine performances present very low electrical efficiencies and consequently few successful prototypes reached commercial maturity at elevated costs.Considering this situation, this thesis presents a numerical thermodynamic study for micro scale CHP-SE systems. The study is divided in two parts: The first part covers the engine analysis; and the second part studies the thermodynamic performance of the overall CHP-SE system. For the engine analysis a detailed thermodynamic model suitable for the simulation of different engine configurations was developed. The model capability to predict the engine performance was validated with experimental data obtained from two different engines: The GPU-3 Stirling engine studied by Lewis Research Centre; and the Genoa engine studied on the experimental rig built at the Energy Department at the Royal Institute of Technology (KTH). The second part of the research complemented the study with the analysis of the overall CHP-SE system. This included numerical simulations of the different CHP components and the sensitivity analysis for selected design parameters.The complete study permitted to assess the different operational and design configurations for the engine and the CHP components. These improvements could be implemented for test field evaluations and thus foster the development of more efficient SE-CHP systems. In addition, the detailed thermodynamic-design methodology for the SE-CHP systems was established and the numerical tool for the design assessment was developed.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xx, 93 p.
Series
TRITA-KRV, ISSN 1100-7990 ; 15:02
Keyword
Stirling engine; Thermodynamic analysis
National Category
Engineering and Technology Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-163048 (URN)978-91-7595-498-1 (ISBN)
Public defence
2015-04-13, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20150327

Available from: 2015-03-27 Created: 2015-03-26 Last updated: 2015-03-27Bibliographically approved

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Araoz Ramos, Joseph AdhemarSalomon, Marianne

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