Wirich,
my experience is that for some special cases the integration of glass capacities make sense.
Especially, if you compare results of glass temperature to measurements and your glazing system has a high solar absorptance in combination with thick glass panes (http://www.ibpsa.org/proceedings/BS2019/BS2019_211101.pdf):
CFS Model Improvement based on Measured Data of a 1:1 Scale Test Mock-up
Comparisons of measurements at a 1:1 scale mock-up
with detailed thermal simulation offer a great opportunity
for model evaluation.
Due to the composition of the investigated glazing system
(8 mm + 8 mm PVB laminated glass, solar protection
coating, 5 mm glass and 8 mm glass) the authors extended
the existing complex fenestration model (CFS) of the
multizone building model of TRNSYS by adding heat
capacity for glass layers.
Simulation results with and without glass capacity
consideration are compared to measurements at a 1:1
scale facade mock-up.
The results show that the consideration of heat capacity of
the glass layers improves the match to measured data
significantly. The extended model resolves issues of high
peak temperatures and a shift in time of occurrence. The
simulation results of the improved CFS model match
closely to the measurements of the mock-up.
Best,
Marion
Dipl.-Ing. Marion Hiller
+49 711 679 76 32 |
hiller@transsolar.com
Transsolar
Stuttgart | Munich | Paris | New York
Transsolar Energietechnik GmbH | Curiestrasse 2 | 70563 Stuttgart | Germany
CEO: Matthias Schuler, Thomas Auer, Stefan Holst, Dieter Schnelle
Registered at Amtsgericht Stuttgart HRB 23347 | USt-IdNr.: DE 152272639
Von: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org>
Im Auftrag von Freppel, Wirich via TRNSYS-users
Gesendet: Freitag, 16. Juli 2021 10:02
An: TRNSYS USERS (trnsys-users@lists.onebuilding.org) <trnsys-users@lists.onebuilding.org>
Cc: Freppel, Wirich <Wirich.Freppel@saint-gobain.com>
Betreff: [TRNSYS-users] Thermal mass of glazings
Hello everyone,
As I am conducting thermal simulation in a high glazed zone (conservatory), I am concerned about thermal mass of glazings. According to the documentation, thermal mass is set as null for glazings.
But, after a hard work of fitting between my simulation model and some experimental data, I noticed that my simulation model is “lighter” than the experimental one (air temperature variates more reactively in simulation).
So, I calculated the thermal mass of all inner glazings (well I approximated it) and added the result to the zone capacitance. The result is very encouraging and I’m quite happy with the simulation model as it is set
now. However, I would like to have your feedback on this. What would be your judgment on this method as thermal experts and is there another way to add a thermal mass to the glazings ?
Best regards
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Wirich FREPPEL Ph.D COSMOS -
Buildings Energy Performance & Daylighting Group
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SAINT-GOBAIN RESEARCH COMPIEGNE 1 rue de Montluçon • BP 40103 • 60777 Thourotte • France Tel: +33 637 053 174 E-mail:
wirich.freppel@saint-gobain.com
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