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Veröffentlichung Klimatisierung im Rechenzentrum(2017) Graaf, Daniel de; Graaf, Daniel deVeröffentlichung Modellbasierte Berechnung des aerosolgebundenen Infektionsrisikos in Klassenräumen, Großraumbüros, Hörsälen und Sporthallen bei unterschiedlichen Nutzungssituationen(2021) Müller, Dirk; Moriske, Heinz-Jörn; Scherer, Christian; Trukenmüller, AlfredIn this article, results are presented by means of a calculation method for assessing the relative risk of infection, with which an (arbitrary) actual environmental situation can be compared with a reference situation. The reference situation describes a classroom with mechanical ventilation, designed according to the current state of the art. It is assumed that there is no absolute, but a high level of security with regard to infections. The selection of room and ventilation parameters ensures that in the reference situation, according to the current state of knowledge, infections via virus-carrying aerosol particles can only spread to a limited extent or not at all. For cases in which equipment with mostly centrally controlled air conditioning systems is not available (this applies to most schools), a reference situation with a relative risk of infection of "1" was also described in school classrooms with ventilation via windows and used as a calculation reference. All calculations can be carried out both steady-state and transient via a website for different rooms and scenarios: http://ri sico.eonerc.rwth-aachen.de/. In all model-based considerations, other transmission paths, such as fomite transmission, non-compliance with general hygiene rules or direct contacts, are left out. The general wearing of effective masks (FFP2, surgical masks with CE mark [DIN EN 14683]), as is increasingly becoming a requirement in the political discussion, is also not presumed. © 2021, VDI Fachmedien GmBbH & Co.. All rights reserved.Veröffentlichung Recovery of Fluorinated Refrigerants from Decommissioned RAC Equipment in Germany - Implications for National Emission Reporting under the UNFCCC(2024) Behringer, David; Gschrey, Barbara; Martens, KerstinGermany is obliged to report emissions of fluorinated greenhouse gases annually under the UNFCCC. This includes emissions of fluorinated refrigerants when decommissioning RAC equipment. To obtain this information, data on the recovery, recycling, and disposal of fluorinated greenhouse gases is necessary, but such data are scarce. The VDKF-LEC database contains information on the recovery of fluorinated refrigerants from decommissioned RAC equipment in Germany and an extracted dataset was used to obtain real-world information for the years 2017 to 2021. Recovery rates for different fluorinated refrigerants from decommissioned commercial and industrial refrigeration as well as stationary air-conditioning equipment were derived. Furthermore, average lifetimes of equipment for the different sectors were calculated. In the analysis, a dependency of charged refrigerant and age of the unit at decommissioning could be observed. Results from the analysis of the VDKF-LEC dataset were compared with reported data under the UNFCCC for Germany and other available data sources. © 2023 by the authors