<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Increasingly high demands on environmental protection are intensifying the development of sustainable construction. Ventilated facades can provide an energy-efficient alternative to standard facades, that is, external thermal insulation composite systems (ETICS). The article compares standard facades, which was a reference, to ventilated facades in two variants: closed joints and open joints. The comparison was made by means of numerical simulations of computational fluid dynamic (CFD), under conditions of high outside temperature and high sunshine. The results showed great benefits of using ventilated facades in such external climate conditions. It was also observed that the selection of the variant of ventilated facade in the system of close or open joints has minimal influence on thermal efficiency of the whole partition.</p></abstract>

Increasingly high demands on environmental protection are intensifying the development of sustainable construction. Ventilated facades can provide an energy-efficient alternative to standard facades, that is, external thermal insulation composite systems (ETICS). The article compares standard facades, which was a reference, to ventilated facades in two variants: closed joints and open joints. The comparison was made by means of numerical simulations of computational fluid dynamic (CFD), under conditions of high outside temperature and high sunshine. The results showed great benefits of using ventilated facades in such external climate conditions. It was also observed that the selection of the variant of ventilated facade in the system of close or open joints has minimal influence on thermal efficiency of the whole partition.

Numerical Comparison of Thermal Behaviour Between Ventilated Facades

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-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Numerical Comparison of Thermal Behaviour Between Ventilated Facades"}

Increasingly high demands on environmental protection are intensifying the development of sustainable construction. Ventilated facades can provide an...

	P1		P3		P7		P10/P17		P11/P14/P20

Localisation	Starting point		40 cm from the wall		Internal edge of the		Air cavity		External edge of
Standard facade	293.15 K (20°C)	100%	319.07 K (45.92°C)	100%	342.73 K (69.58°C)	100%	-	-	341.51 K (68.36°C)	100%
Closed-joint ventilated facade	293.15 K (20°C)	100%	303.96 K (30.81°C)	95,3%	315.34 K (42.19°C)	92.0%	313.81 K (40.66°C)	99.3%	340.93 K (67.78°C)	99.8%
Open-joint ventilated facade	293.15 K (20°C)	100%	303.55 K (30.40°C)	95,1%	313.91 K (40.76°C)	91.6%	316.02 K (42.87°C)	100%	338.59 K (65.44°C)	99.1%

Materials	Density (kg/m³)	Specific Heat (J/[kg·K])	Thermal Conductivity (W/[m·K])
Silicate blocks	1900	880	0.800
Polyurethane – insulation	30	133	0.0207
Fibre cement boards	1800	920	0.400

Numerical Comparison of Thermal Behaviour Between Ventilated Facades

Article Category: Original Study

Published Online: May 20, 2020

Page range: 297 - 305

Received: Feb 18, 2020

Accepted: Mar 23, 2020

DOI: https://doi.org/10.2478/sgem-2019-0044

Keywords
ventilated facade, heat transfer, CFD, numerical simulation, Energy-efficient facade

© 2020 Krzysztof Schabowicz et al., published by Sciendo

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

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Chart 1

Characteristic values of temperature.

Thermodynamic parameters of materials.

Numerical Comparison of Thermal Behaviour Between Ventilated Facades

Article Category: Original Study

Published Online: May 20, 2020

Page range: 297 - 305

Received: Feb 18, 2020

Accepted: Mar 23, 2020

DOI: https://doi.org/10.2478/sgem-2019-0044

Keywordsventilated facade, heat transfer, CFD, numerical simulation, Energy-efficient facade

© 2020 Krzysztof Schabowicz et al., published by Sciendo

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

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Chart 1

Characteristic values of temperature.

Thermodynamic parameters of materials.

Keywords
ventilated facade, heat transfer, CFD, numerical simulation, Energy-efficient facade