<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions and the development of sustainable construction. Ventilated facades perfectly match into this trend, and with their appropriate design, they bring real energy savings. This paper analyzes numerically the influence of the inflowing air, mimicking the wind, on the efficiency of heat removal from the ventilated space and heat transmission by thermal radiation and conduction through the consecutive layers of the external wall. For the purpose of comparison, two variants of ventilated facade were adopted: open and closed joints, at different wind speeds prevailing outside. The results obtained show that in windless weather, the ventilated facade with open joints shows higher heat removal efficiency and thus lower heat transmission to the building interior. At higher wind speeds of 5 m/s, the open-joint and closed-joint ventilated facades achieve similar heat transfer efficiency, and the prevailing temperature inside the building for the two technologies is almost identical. Subsequent increments of incoming wind on the building result in minimal differences in the heat transmission to the building interior, representing changes of about 0.1°C at increments of another 5 m/s of incoming wind. Conscious use of this facade technology, along with appropriate urban design of cities, can help reduce the energy needed to cool buildings during the summer period.</p>
</abstract>

The gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions and the development of sustainable construction. Ventilated facades perfectly match into this trend, and with their appropriate design, they bring real energy savings. This paper analyzes numerically the influence of the inflowing air, mimicking the wind, on the efficiency of heat removal from the ventilated space and heat transmission by thermal radiation and conduction through the consecutive layers of the external wall. For the purpose of comparison, two variants of ventilated facade were adopted: open and closed joints, at different wind speeds prevailing outside. The results obtained show that in windless weather, the ventilated facade with open joints shows higher heat removal efficiency and thus lower heat transmission to the building interior. At higher wind speeds of 5 m/s, the open-joint and closed-joint ventilated facades achieve similar heat transfer efficiency, and the prevailing temperature inside the building for the two technologies is almost identical. Subsequent increments of incoming wind on the building result in minimal differences in the heat transmission to the building interior, representing changes of about 0.1°C at increments of another 5 m/s of incoming wind. Conscious use of this facade technology, along with appropriate urban design of cities, can help reduce the energy needed to cool buildings during the summer period.

Efficiency of ventilated facades in terms of airflow in the air gap

Wrocław University of Science and Technology, Faculty of Civil Engineering

Wrocław University of Science and Technology

Faculty of Civil Engineering, Department of Construction Technology

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution 4.0 International License.

{"article-title":"Efficiency of ventilated facades in terms of airflow in the air gap"}

The gradual exploitation of the natural environment has forced most developed countries to promote ecological solutions and the development of sustainable...

Efficiency of ventilated facades in terms of airflow in the air gap

Article Category: Original Study

Online veröffentlicht: 30. Sept. 2021

Seitenbereich: 224 - 236

Eingereicht: 14. Apr. 2021

Akzeptiert: 11. Mai 2021

DOI: https://doi.org/10.2478/sgem-2021-0014

Schlüsselwörter
ventilated facades, heat transfer, heat transmission, CFD, numerical simulation, energy efficient facades

© 2021 Krzysztof Schabowicz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Efficiency of ventilated facades in terms of airflow in the air gap

Article Category: Original Study

Online veröffentlicht: 30. Sept. 2021

Seitenbereich: 224 - 236

Eingereicht: 14. Apr. 2021

Akzeptiert: 11. Mai 2021

DOI: https://doi.org/10.2478/sgem-2021-0014

Schlüsselwörterventilated facades, heat transfer, heat transmission, CFD, numerical simulation, energy efficient facades

© 2021 Krzysztof Schabowicz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Schlüsselwörter
ventilated facades, heat transfer, heat transmission, CFD, numerical simulation, energy efficient facades