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Integration of Stirling engines into residential boilers for combined heat and power services: Thermodynamic modelling and analysis
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.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.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The use of simulation techniques for the study of Combined Heat and Power systems based on Stirling Engines (CHP-SE) has been focused on dynamic simulations that guide the sizing of the system components. These are valuable tools for the performance evaluation of determined designs. However, there is a need to complement these studies with additional analysis that could permit to assess the design improvement and the integration of the system components. For this reason, the present work developed a model that coupled the design equations of each component with the equations that describe the thermal interactions presented in the overall system.

This integration allowed to obtain a deeper insight into the thermodynamic characteristics of the overall system, and thus was used for the study of a micro CHP-SE experimental rig.  The results for this case study allowed to quantify the main energy outputs, the energy losses, and the influence of different parameters on the system. The overall efficiency under the original conditions presented values ranging from 60%-64% with very low exergy efficiencies ranging from 5%-7%. The simulation analysis permitted to identify design and operational parameters that would increase the overall efficiency to values closer to 80% and the exergy to values closer to 14%. These increments would correspond to the reduction of the energy losses, improvements on the conditions for the biomass combustion, and the use of engines with higher electrical outputs. 

Keyword [en]
Stirling engine; Combined Heat and Power
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-163052OAI: oai:DiVA.org:kth-163052DiVA: diva2:798498
Funder
Sida - Swedish International Development Cooperation Agency
Note

QS 2015

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

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