Thermo-economic analysis of a micro-cogeneration system based on a rotary steam engine (RSE)
2012 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 44, 11-20 p.Article in journal (Refereed) Published
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.
Rotary steam engine, Biomass boiler, Residential micro-cogeneration, Modeling, Simulation
IdentifiersURN: urn:nbn:se:kth:diva-66726DOI: 10.1016/j.applthermaleng.2012.03.026ISI: 000305672200002ScopusID: 2-s2.0-84860795704OAI: oai:DiVA.org:kth-66726DiVA: diva2:484506
QC 201207272012-01-272012-01-272012-07-27Bibliographically approved