LAPSE:2023.27637
Published Article
LAPSE:2023.27637
Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems
Nicolas Carbonare, Hannes Fugmann, Nasir Asadov, Thibault Pflug, Lena Schnabel, Constanze Bongs
April 4, 2023
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. The results show that including component-based heat recovery and fan modeling leads to 30% higher heat losses due to ventilation and 10% more fan energy consumption than when assuming constant air exchange rates with ideal heat recovery. These findings contribute to a better understanding of the behavior of a growing technology such as decentralized ventilation and confirm the need for further research on these systems.
Keywords
Computational Fluid Dynamics, decentralized ventilation, heat recovery, honeycomb heat exchanger, Modelica
Suggested Citation
Carbonare N, Fugmann H, Asadov N, Pflug T, Schnabel L, Bongs C. Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems. (2023). LAPSE:2023.27637
Author Affiliations
Carbonare N: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany; Building Science Group, Karlsruhe Institute of Technology, Englerstr. 7, 76131 Karlsruhe, Germany
Fugmann H: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany [ORCID]
Asadov N: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
Pflug T: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
Schnabel L: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
Bongs C: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
Journal Name
Energies
Volume
13
Issue
22
Article Number
E6010
Year
2020
Publication Date
2020-11-17
Published Version
ISSN
1996-1073
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Original Submission
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PII: en13226010, Publication Type: Journal Article
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LAPSE:2023.27637
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doi:10.3390/en13226010
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