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Open AccessArticle

Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems

1
Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
2
Building Science Group, Karlsruhe Institute of Technology, Englerstr. 7, 76131 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(22), 6010; https://doi.org/10.3390/en13226010
Received: 15 October 2020 / Revised: 11 November 2020 / Accepted: 12 November 2020 / Published: 17 November 2020
(This article belongs to the Special Issue Applied Thermodynamics and Heat Transfer for Buildings)
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. View Full-Text
Keywords: decentralized ventilation; heat recovery; honeycomb heat exchanger; computational fluid dynamics; Modelica decentralized ventilation; heat recovery; honeycomb heat exchanger; computational fluid dynamics; Modelica
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MDPI and ACS Style

Carbonare, N.; Fugmann, H.; Asadov, N.; Pflug, T.; Schnabel, L.; Bongs, C. Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems. Energies 2020, 13, 6010. https://doi.org/10.3390/en13226010

AMA Style

Carbonare N, Fugmann H, Asadov N, Pflug T, Schnabel L, Bongs C. Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems. Energies. 2020; 13(22):6010. https://doi.org/10.3390/en13226010

Chicago/Turabian Style

Carbonare, Nicolas; Fugmann, Hannes; Asadov, Nasir; Pflug, Thibault; Schnabel, Lena; Bongs, Constanze. 2020. "Simulation and Measurement of Energetic Performance in Decentralized Regenerative Ventilation Systems" Energies 13, no. 22: 6010. https://doi.org/10.3390/en13226010

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