TY - JOUR N2 - The paper is devoted to some problems connected with last modification of EU directive on energy efficiency, viz.: free choice of the measure concerning the improvement of energy efficiency, i.e. final or primary energy consumption, corresponding energy savings or energy-consumption index; however without cumulative consumption or cumulative savings of primary energy. In EU directive it has been stressed the importance of measurements systems (reliable measurement information); but has not been recommended any advanced validation of measurements results, nor energy auditing or algorithms of calculating the energy savings due to improvement of energy efficiency concerning large industrial plants. Evaluation of complex buildings should be realized by means of the system method (input-output analysis). The separate problem is devoted to application of thermo-ecological approach in the analysis of complete results of improving the energy efficiency. Human activity is connected with the depletion of nonrenewable resources, including primary energy, due to not only production of consumer goods but also the necessity of compensating the unfavourable effects of harmful emissions from energy-technological processes. Therefore the index of energy-ecological efficiency has been proposed as the most competent evaluation of improvement energy efficiency of production processes and systems. L1 - http://journals.pan.pl/Content/116763/PDF/14_paper.pdf L2 - http://journals.pan.pl/Content/116763 PY - 2020 IS - No 2 EP - 299 DO - 10.24425/ather.2020.133633 KW - energy efficiency KW - system analysis KW - Exergy KW - Thermo-ecology KW - Energy-ecological efficiency A1 - Ziębik, Andrzej A1 - Stanek, Wojciech PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences VL - vol. 41 DA - 2020.06.25 T1 - Energy efficiency – selected thermo-ecological problems SP - 277 UR - http://journals.pan.pl/dlibra/publication/edition/116763 T2 - Archives of Thermodynamics ER -