Editorial/ preface of VSI:ATE_AESMT'22

The special issue “VSI:AESMT′ 22“ aims to provide novel research papers in the field of the Renewable Energy as a part of the conference “Alternative energy sources, materials and technologies (AESMT′ 22)”. The conference was foreseen to be held in Veliko Tarnovo, Bulgaria. However due to the pandemic the conference was held on-line on 27–28 June 2022. The following distinguished scientists gave plenary reports during the conference: - Prof. Soteris Kalogirou (Editor-in-Chief of “Renewable Energy”, Cyprus); - Prof. André Thess (Director, German Aerospace Center, Institute of Engineering Thermodynamics, Germany). Some more important points about the AESMT'22 conference are as follows: - Representatives of 23 countries sent papers to the conference, namely from Belarus, Brazil, Bulgaria, China, Chile, France, Germany, India, Iran, Israel, Italy, Kazakhstan, Kuwait, Latvia, Poland, Portugal, Romania, Russia, Serbia, Spain, Tajikistan, Turkey, and United Kingdom; - The total number of the presented articles was 67 (25 of them orally, the others were posters); - After the preliminary review, 15 articles have been selected for submission in “Applied Thermal Engineering” journal.