Posting Date | 4 October 2011
Country | Germany
Theme | Energy performance certification, Energy efficiency technologies and materials, Energy sources, district heating / cooling, cogeneration, Building operation, monitoring, energy management, Calculation, simulation, General
Abstract | Reutlingen University initiated a project funded by the German Federal Ministry of Education and Research (BMBF) that analysed the performance of 4 micro-CHP units. Two of the units were based on a Stirling engine (SOLO Stirling 161 and Stirling Denmark SM5A) and the other two were conventional gas engines based on the Otto-cycle (SenerTec “Dachs” and PowerPlus Technologies “ecopower”).
Lessons learnt | The gas Otto unit SenerTec “Dachs” was superior in terms of electric efficiency compared to the Stirling
units. However, high internal cooling and, consequently, high engine temperatures result in higher heat losses. Thus, Stirling engine powered micro-CHP’s show better overall efficiencies than gas Otto units, as proved by the SOLO Stirling CHP. With regard to emissions, Stirling units can work without a catalyst, while the other cannot. If a catalyst is installed however; gas Otto units bear the potential for very low emissions. Overall, the SOLO Stirling micro-CHP unit was the one that best fitted all the requirements.
All the information regarding this study has been published in “Mini-Blockheizkraftwerke – Grundlagen, Gerätetechnik, Betriebsdaten” by Bernd Thomas.
Case Languages | English