Non-ideal Stirling engine thermodynamic model suitable for the integration into overall energy systems
2014 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, ISSN 1359-4311, Vol. 73, no 1, 203-219 p.Article in journal, Meeting abstract (Refereed) Published
The reliability of modelling and simulation of energy systems strongly depends on the prediction accuracy of each system component. This is the case of Stirling engine-based systems, where an accurate modelling of the engine performance is very important to understand the overall system behaviour. In this sense, many Stirling engine analyses with different approaches have been already developed. However, there is a lack of Stirling engine models suitable for the integration into overall system simulations. In this context, this paper aims to develop a rigorous Stirling engine model that could be easily integrated into combined heat and power schemes for the overall techno-economic analysis of these systems. The model developed considers a Stirling engine with adiabatic working spaces, isothermal heat exchangers, dead volumes, and imperfect regeneration. Additionally, it considers mechanical pumping losses due to friction, limited heat transfer and thermal losses on the heat exchangers. The predicted efficiency and power output were compared with the numerical model and the experimental work reported by the NASA Lewis Research Centre for the GPU-3 Stirling engine. This showed average absolute errors around ±4% for the brake power, and ±5% for the brake efficiency at different frequencies. However, the model also showed large errors (±15%) for these calculations at higher frequencies and low pressures. Additional results include the calculation of the cyclic expansion and compression work; the pressure drop and heat flow through the heat exchangers; the conductive, shuttle effect and regenerator thermal losses; the temperature and mass flow distribution along the system; and the power output and efficiency of the engine.
Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 73, no 1, 203-219 p.
Stirling engine; simulation; thermodynamics;CHP;
Research subject Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-150576DOI: 10.1016/j.applthermaleng.2014.07.050ISI: 000346543400021ScopusID: 2-s2.0-84906080788OAI: oai:DiVA.org:kth-150576DiVA: diva2:744120
ProjectsMicro-Scale Biomass Polygeneration
FunderSida - Swedish International Development Cooperation Agency
QC 201409122014-09-062014-09-062015-03-27Bibliographically approved