Open AccessArticle by Xiaoye Cai 1,*,†, Thomas Schild 2,†, Alexander Kümpel 1 and Dirk Müller 1 1 Institute for Energy Efficient Buildings and Indoor Climate (EBC), E.ON Energy Research Center, RWTH Aachen University, Mathieustrasse 10, 52074 Aachen, Germany 2 Drees & Sommer SE, Obere Waldplätze 11, 70569 Stuttgart, Germany * Author to whom correspondence should be addressed. † These authors contributed equally to this work.