Micro-cogeneration Stirling engines are promising for residential applications. This work focuses on the experimental and numerical analyses of a commercial unit generating 8 kW of hot water and 1 kW of electricity burning natural gas. Measurements are coupled to a detailed model based on a modification of Urieli and Berchowitz’s work. The results indicate that the thermal efficiency is influenced by the water loop inlet temperature, varying from 90% at 30°C to 84% at 70°C (HHV-based). The measured and simulated powers of the engine are in the 900-964 W range depending on the water temperature and differ by less than 4%. Net electric efficiency of the engine is 15% and of the whole cogeneration unit above 9% (HHV-based). Helium instead of Nitrogen as working fluid is expected to increase the performance.

Modeling and testing of a micro-cogeneration Stirling engine under diverse conditions of the working fluid

VALENTI, GIANLUCA;CAMPANARI, STEFANO;SILVA, PAOLO;FERGNANI, NICOLA;RAVIDA', ANTONINO;DI MARCOBERARDINO, GIOELE;MACCHI, ENNIO
2014

Abstract

Micro-cogeneration Stirling engines are promising for residential applications. This work focuses on the experimental and numerical analyses of a commercial unit generating 8 kW of hot water and 1 kW of electricity burning natural gas. Measurements are coupled to a detailed model based on a modification of Urieli and Berchowitz’s work. The results indicate that the thermal efficiency is influenced by the water loop inlet temperature, varying from 90% at 30°C to 84% at 70°C (HHV-based). The measured and simulated powers of the engine are in the 900-964 W range depending on the water temperature and differ by less than 4%. Net electric efficiency of the engine is 15% and of the whole cogeneration unit above 9% (HHV-based). Helium instead of Nitrogen as working fluid is expected to increase the performance.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/817318
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