How LENICALC was born
“The UNI EN 15193 standard presents a very complex and onerous calculation procedure for professionals who are preparing to apply it in the energy assessments of buildings”explains Laura Blasocoordinator of the UNI working group and head of the ENEA Smart Cities and Communities Laboratory at the Energy Technologies and Renewable Sources Department. “For this reason it is rarely applied, also because there are no tools capable of exhaustively applying the calculation method that LENICALC will be able to do by the end of 2024.”
To develop LENICALC, ENEA and La Sapienza conducted one detailed study on the application of the calculation method, realizing approx 2 thousand numerical simulations. This allowed us to determine the LENI reference values for various types of buildings, making the tool extremely accurate and reliable.
“Taking into account that the consumption of artificial lighting systems represents today at least 15-30% of the total consumption of a buildingit is clear that it cannot be calculated summarily,” Blaso underlines. “Hence the importance of continuing on the path undertaken, since lighting is a strategic asset, highly energy intensiveon which there is still a lot to do with a view to sustainable energy and environmental transition”.
How LENICALC works
The software calculates the LENI indicator according to the complete method of EN 15193-1:2021guiding the user through correct determination of each required parameter. LENICALC strictly complies with the standard, ensuring precise results that comply with current regulations.
LENICALC is accompanied by explanations contained in the Reference Practice UNI/PdR 77:2024titled “Guidelines for computerized calculation for the determination of LENI according to the complete calculation method of UNI EN 15193-1:2021”. This document provides simple and clear explanations, guiding you through the entire calculation process. The procedure is available on the UNI website.
The project for the creation of LENICALC was carried out by ENEA as part of the activities for the “Electrical System Research“. It saw the collaboration of the UNI/CT023/GL10 Working Group “Energy Saving in Buildings” of the UNI CT023 “Light and Illumination” Technical Commission.
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