Heat recovery ventilation system heating energy weather normalization – calculation method and case studyKuivjõgi, Helena; Laaneste, Janar; Thalfeldt, Martin; Kurnitski, JarekE3S Web Conference: BuildSim Nordic 20222022 / art. 09003 https://doi.org/10.1051/e3sconf/202236209003 Conference proceedings at Scopus Article at Scopus