relative technical efficiency and productivity change of these companies. In order to verify the stability of our DEA model and …This paper provides an empirical analysis of the determinants of energy efficiency in 32 power electric generation … technical efficiency of companies decreased during the study period. Nearly half of the companies (14) are below this average …

Variable-speed drives in any machine provide an accurate control and high-energy efficiency. More and more often …. The paper aims to achieve accurate efficiency estimation by presenting a new modified calculation method to predict the …

and thermal efficiencies for these cycles was performed. The findings demonstrated that the highest thermal efficiency was … achieved using the recompression Brayton cycle, at June noontime. The maximum integrated system thermal efficiency using this … cycle was 40% while the maximum thermal efficiency of this cycle alone was 52%. The regenerative Brayton cycle, although …

motors efficiency as one of the greatest energy consumption apparatuses in the world. Induction motors constitute, by far … powerful candidate with growing market are investigated in some details. The motor opportunities like high efficiency, high …

the second law efficiency of the device by 50% points, corresponding to a 3.8% point increase in thermal efficiency. …

This work compares two classes of exergy efficiency definitions and applies them on a simple process (i.e. PRICO) for … efficiency definitions already proposed in the literature. In addition, the paper highlights the importance of decomposing the …

and use of energy and exergy based performance criteria, and of the Second Law efficiency, with an aim at the advancement …