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FACEcamp Results Seminar
A new modelling approach for Complex
Fenestration system via CFD and Radiance
Ingrid Demanega
Eur...
Complex Fenestration Systems
Results Seminar 20 May 2019, Bolzano
Source: Bartenbach GmbH Source: RETROLux Therm
Source: R...
Standard ISO 15099 based modelling approach
used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus)
Results Semin...
Standard ISO 15099 based modelling approach
used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus)
Results Semin...
Standard ISO 15099 based modelling approach
used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus)
Results Semin...
Aim of the work
Definition of a modelling approach for
Complex Fenestration Systems to assess
the thermal behaviour
Result...
Modelling approach
Results Seminar 20 May 2019, Bolzano
1. Detailed optical model for solar radiation
based on ray tracing...
Modelling approach
Results Seminar 20 May 2019, Bolzano
1. Detailed optical model for solar radiation
based on ray tracing...
Modelling approach
Results Seminar 20 May 2019, Bolzano
2. CFD simulation – Finite element software COMSOL Multiphysics
• ...
Modelling approach
Results Seminar 20 May 2019, Bolzano
2. CFD simulation – Finite element software COMSOL Multiphysics
• ...
Measurements
Fenestration typologies
Results Seminar 20 May 2019, Bolzano
Standard Fenestration System
with blinds
Complex...
Results
Results Seminar 20 May 2019, Bolzano
Stationary boundary conditions (winter)
Winter Unit
Text -18 °C
hsf_ext 25 W/...
Results
Results Seminar 20 May 2019, Bolzano
Stationary boundary conditions (summer)
Summer Unit
Text 32 °C
hsf_ext 25 W/(...
Results
Results Seminar 20 May 2019, Bolzano
Stationary boundary conditions (summer)
Summer Unit
Text 32 °C
hsf_ext 25 W/(...
Results
Results Seminar 20 May 2019, Bolzano
Stationary boundary conditions (summer)
Summer Unit
Text 32 °C
hsf_ext 25 W/(...
Results
Results Seminar 20 May 2019, Bolzano
Time-dependent measured boundary conditions (February 2018)
0
100
200
300
400...
Results Seminar 20 May 2019, Bolzano
Temperature and velocity in time for a CFS
September 2018: 10am-9pm
Conclusions
Results Seminar 20 May 2019, Bolzano
• Valid modelling approach to assess thermal behaviour of Complex Fenestr...
References
• http://www.facecamp.it/
• http://www.face.bz.it/
• A. McNeil, BSDFs, Matrices and Phases. https://www.radianc...
Thank you for your attention!
www.interreg.net
Ingrid Demanega
Eurac Research, Frener&Reifer
ingrid.demanega@eurac.edu
FAC...
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A new modelling approach for Complex Fenestration system via CFD and Radiance Ingrid Demanega (Eurac Research, Frener & Reifer), Giuseppe De Michele (Eurac Research)

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FACEcamp Results Seminar
20/05/2019 NOI Techpark, Bolzano (Italy)
Monday, May 20th, 2019
NOI Techpark, Bolzano-Bozen

Published in: Technology
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A new modelling approach for Complex Fenestration system via CFD and Radiance Ingrid Demanega (Eurac Research, Frener & Reifer), Giuseppe De Michele (Eurac Research)

  1. 1. FACEcamp Results Seminar A new modelling approach for Complex Fenestration system via CFD and Radiance Ingrid Demanega Eurac Research, Frener&Reifer www.interreg.net Bolzano, 20 May 2019 FACEcamp is funded by European Regional Development Fund and Interreg V-A Italy-Austria 2014-2020.
  2. 2. Complex Fenestration Systems Results Seminar 20 May 2019, Bolzano Source: Bartenbach GmbH Source: RETROLux Therm Source: RETROFlex Therm • Visual comfort: Homogenous daylight distribution; Glare avoidance; Outside visibility. • Thermal comfort: Avoidance of overheating in summer; Solar gains in winter. • Energy saving: Reduction of artificial light; Reduction of heating and cooling demand.
  3. 3. Standard ISO 15099 based modelling approach used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus) Results Seminar 20 May 2019, Bolzano Thermal modelling: • Convective heat transfer based on a pressure drop model applied to a layer-by-layer approach; opening characteristics of the shading device. Source: ISO 15099:2003
  4. 4. Standard ISO 15099 based modelling approach used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus) Results Seminar 20 May 2019, Bolzano Thermal modelling: • Convective heat transfer based on a pressure drop model applied to a layer-by-layer approach; opening characteristics of the shading device. Optical modelling: • 1D approach; • Ideal diffuse surfaces; • Flat slat geometry. Source: ISO 15099:2003
  5. 5. Standard ISO 15099 based modelling approach used in the main simulation tools (WINDOW 7, TRNSYS, EnergyPlus) Results Seminar 20 May 2019, Bolzano Thermal modelling: • Convective heat transfer based on a pressure drop model applied to a layer-by-layer approach; opening characteristics of the shading device. Optical modelling: • 1D approach; Source: Hiller and Schöttl (2014) replaced by a detailed optical model: Bidirectional Scattering Distribution Function (BSDF) ✓ Complex geometries ✓ Highly reflective surfaces
  6. 6. Aim of the work Definition of a modelling approach for Complex Fenestration Systems to assess the thermal behaviour Results Seminar 20 May 2019, Bolzano Restrictions of the standard approach Components critical temperature Dynamic behaviour
  7. 7. Modelling approach Results Seminar 20 May 2019, Bolzano 1. Detailed optical model for solar radiation based on ray tracing ➢ Calculation of absorbed fraction of solar radiation 2. Fluid flow and heat transfer (CFD simulation) + WINDOW 7.6
  8. 8. Modelling approach Results Seminar 20 May 2019, Bolzano 1. Detailed optical model for solar radiation based on ray tracing ➢ Calculation of absorbed fraction of solar radiation + Measure shading material BRDF Model shading system BSDF Combine shading system and glazings Absorption coefficients‘ vector WINDOW 7.6
  9. 9. Modelling approach Results Seminar 20 May 2019, Bolzano 2. CFD simulation – Finite element software COMSOL Multiphysics • Incompressible fluid with Boussinesq approximation; • Surface-to-surface (radiosity) method for long wave radiation exchange;
  10. 10. Modelling approach Results Seminar 20 May 2019, Bolzano 2. CFD simulation – Finite element software COMSOL Multiphysics • Calculation grid Mesh sensitivity analysis for fenestration system Final mesh for fenestration system
  11. 11. Measurements Fenestration typologies Results Seminar 20 May 2019, Bolzano Standard Fenestration System with blinds Complex Fenestration System with blinds Standard Fenestration System without blinds WINDOW 7.6 ++
  12. 12. Results Results Seminar 20 May 2019, Bolzano Stationary boundary conditions (winter) Winter Unit Text -18 °C hsf_ext 25 W/(m²K) Tint 21 °C hsf_int 7.7 W/(m²K) Isol 0 W/m² Stationary NFRC BC U ΔU ΔU/U [W/(m²K)] [W/(m²K)] [%] Standard Fenestration System without blinds 2.765 WINDOW 7 2.636 -0.129 -4.67% COMSOL + Radiance Standard Fenestration System with blinds 2.373 WINDOW 7 2.363 -0.010 -0.41% COMSOL + Radiance Complex Fenestration System with blinds 0.638 WINDOW 7 0.587 -0.051 -7.98% COMSOL + Radiance
  13. 13. Results Results Seminar 20 May 2019, Bolzano Stationary boundary conditions (summer) Summer Unit Text 32 °C hsf_ext 25 W/(m²K) Tint 24 °C hsf_int 7.7 W/(m²K) Isol 783 W/m² Stationary NFRC BC qi τe g Δg Δg/g [-] [-] [-] [-] [%] Standard Fenestration System without blinds 0.090 0.607 0.697 - - WINDOW 7 0.090 0.607 0.697 0.000 0.0% COMSOL + Radiance Standard Fenestration System with blinds 0.173 0.126 0.299 - - WINDOW 7 0.171 0.126 0.297 -0.002 -0.7% COMSOL + Radiance Complex Fenestration System with blinds 0.048 0.020 0.068 - - WINDOW 7 0.052 0.036 0.088 - - WINDOW 7 + BSDF 0.052 0.036 0.088 0.020 29.3% COMSOL + Radiance
  14. 14. Results Results Seminar 20 May 2019, Bolzano Stationary boundary conditions (summer) Summer Unit Text 32 °C hsf_ext 25 W/(m²K) Tint 24 °C hsf_int 7.7 W/(m²K) Isol 783 W/m² Stationary NFRC BC qi τe g Δg Δg/g [-] [-] [-] [-] [%] Standard Fenestration System without blinds 0.090 0.607 0.697 - - WINDOW 7 0.090 0.607 0.697 0.000 0.0% COMSOL + Radiance Standard Fenestration System with blinds 0.173 0.126 0.299 - - WINDOW 7 0.171 0.126 0.297 -0.002 -0.7% COMSOL + Radiance Complex Fenestration System with blinds 0.048 0.020 0.068 - - WINDOW 7 0.052 0.036 0.088 - - WINDOW 7 + BSDF 0.052 0.036 0.088 0.000 0.0% COMSOL + Radiance
  15. 15. Results Results Seminar 20 May 2019, Bolzano Stationary boundary conditions (summer) Summer Unit Text 32 °C hsf_ext 25 W/(m²K) Tint 24 °C hsf_int 7.7 W/(m²K) Isol 783 W/m² Stationary NFRC BCTemperatureandfluidvelocityfortheSFS instandardsummercondition TemperatureandfluidvelocityfortheCFS instandardsummercondition
  16. 16. Results Results Seminar 20 May 2019, Bolzano Time-dependent measured boundary conditions (February 2018) 0 100 200 300 400 500 600 700 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 9 10 11 12 13 14 15 16 17 18 Irradiance[W/m²] Heatflux[W/m²] time [h] heat flux - simulated (COMSOL + Radiance) heat flux - measured (HFP) heat flux - measured (in-situ device) Global vertical irradiance (west) Simulatedandmeasuredheatflux(CFS)
  17. 17. Results Seminar 20 May 2019, Bolzano Temperature and velocity in time for a CFS September 2018: 10am-9pm
  18. 18. Conclusions Results Seminar 20 May 2019, Bolzano • Valid modelling approach to assess thermal behaviour of Complex Fenestration Systems: Solar heat gains (primary and secondary heat fluxes); • Appropriate for detailed thermal analysis of Complex Fenestration Systems: Components‘ critical temperature; • Capable of assessing dynamic behaviour of Complex Fenestration Systems. • Validation ongoing for different façade configurations (blind position, cavity ventilation etc.); • Feasibility study of a simulation application for thermal modeling of CFS. Outlooks
  19. 19. References • http://www.facecamp.it/ • http://www.face.bz.it/ • A. McNeil, BSDFs, Matrices and Phases. https://www.radiance-online.org/community/workshops/2014- london/presentations/day1/McNeil_BSDFsandPhases.pdf. • McNeil, A., The three-phase method for simulating complex fenestration with radiance, 2014. • The finite element method (FEM). https://www.comsol.com/multiphysics/finite-element-method. • Versteeg, H. K. and Malalasekera, M., An introduction to computational fluid dynamics: the finite volume method. Harlow: Pearson/Prentice Hall, nachdr. ed., 2005. • Demanega, I., De Michele, G., Pernigotto, G., Avesani, S., Babich, F., Gasparella, A. CFD and ray tracing to evaluate the thermal performance of Complex Fenestration Systems, Building Simulation Optimization (BSO), University of Cambridge, Cambridge, United Kingdom, 2018. • Hauer, M., Model Development and Validation for an Integrative Thermal and Daylight Evaluation of Complex Fenestration Systems in Building Performance Simulations. PhD Dissertation, Universität Innsbruck, Institut für Konstruktion und Materialwissenschaften, AB Energieeffizientes Bauen, 2017. • ISO, 2003. ISO 15099:2003: Thermal performance of windows, doors and shading devices — Detailed calculations. • Kuhn, T. E., Herkel, S., Frontini, F., Strachan, P., Kokogiannakis, G. Solar control: A general method for modelling of solar gains through complex facades in building simulation programs. Energy and Buildings 43, 19–27, 2011. • Hiller, M., Schöttl, P., Modellierung komplexer Verglasungssysteme in TRNSYS, BauSIM Conference, 2014. • Hauer M. and Pfluger, R., Entwicklung eines neuartigen Konzeptes zur In-situ-Messung von g-Werten an komplexen Verglasungssystemen, Bauphysik, vol. 38, pp. 265-273, Oct. 2016. Results Seminar 20 May 2019, Bolzano
  20. 20. Thank you for your attention! www.interreg.net Ingrid Demanega Eurac Research, Frener&Reifer ingrid.demanega@eurac.edu FACEcamp is funded by European Regional Development Fund and Interreg V-A Italy-Austria 2014-2020.

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