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Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems

Carbonare, Nicolas; Fugmann, Hannes; Asadov, Nasir; Pflug, Thibault; Schnabel, Lena; Bongs, Constanze

Abstract:
Decentralized regenerative mechanical ventilation systems have acquired relevance in recent years for the retrofit of residential buildings. While manufacturers report heat recovery efficiencies over 90%, research has shown that the efficiencies often vary between 60% and 80%. In order to better understand this mismatch, a test facility is designed and constructed for the experimental characterization and validation of regenerative heat exchanger simulation models. A ceramic honeycomb heat exchanger, typical for decentralized regenerative ventilation devices, is measured in this test facility. The experimental data are used to validate two modeling approaches: a one-dimensional model in Modelica and a computational fluid dynamics (CFD) model built in COMSOL Multiphysics®. The results show an overall acceptable thermal performance of both models, the 1D model having a much lower simulation time and, thus, being suitable for integration in building performance simulations. A test case is designed, where the importance of an appropriate thermal and hydraulic modeling of decentralized ventilation systems is investigated. Therefore, the device is integrated into a multizone building simulation case. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129894
Veröffentlicht am 19.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut Entwerfen und Bautechnik (IEB)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000129894
Erschienen in Energies
Verlag MDPI
Band 13
Heft 22
Seiten Art.-Nr.: 6010
Vorab online veröffentlicht am 17.11.2020
Schlagwörter decentralized ventilation; heat recovery; honeycomb heat exchanger; computational fluid dynamics; Modelica
Nachgewiesen in Web of Science
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