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Thermo-economic analysis of a micro-cogeneration system based on a rotary steam engine (RSE)
Department of Energy Technology, Aalto University.
Department of Energy Technology, Aalto University.
Department of Energy Technology, Aalto University.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3661-7016
2012 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 44, 11-20 p.Article in journal (Refereed) Published
Abstract [en]

A rotary steam engine (RSE) is a simple, small, quiet and lubricant-free option for micro-cogeneration. It is capable of exploiting versatile thermal sources and steam temperatures of 150 to 180 ºC, which allow operational pressures less than 10 bar for electrical power ranges of 1 to 20 kWe. An RSE can be easily integrated in commercially available biomass-fired household boilers. In this paper, we characterize the boiler-integrated RSE micro-cogeneration system and specify a two-control-volume thermodynamic model to conduct performance analyses in residential applications. Our computational analysis suggests that an RSE integrated with a 17 kWth pellet-fuelled boiler can obtain an electrical output of 1.925 kWe, in the design temperature of 150 ºC, the electrical efficiency being 9% (LHV) and the thermal efficiency 77% (LHV). In a single-family house inFinland, the above system would operate up to 1274 h/a, meeting 31% of the house’s electrical demand. The amount of electricity delivered into the grid is 989 kWh/a. An economic analysis suggests that incremental costs not exceeding € 1,500 are justifiable at payback periods less than five years, when compared to standard boilers.

Place, publisher, year, edition, pages
2012. Vol. 44, 11-20 p.
Keyword [en]
Rotary steam engine, Biomass boiler, Residential micro-cogeneration, Modeling, Simulation
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-66726DOI: 10.1016/j.applthermaleng.2012.03.026ISI: 000305672200002ScopusID: 2-s2.0-84860795704OAI: diva2:484506

QC 20120727

Available from: 2012-01-27 Created: 2012-01-27 Last updated: 2012-07-27Bibliographically approved

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