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Title:
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Numerical study on the thermal performance of a ventilated facade with PCM
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Author:
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Gracia Cuesta, Alvaro de; Navarro Farré, Lidia; Castell, Albert; Cabeza, Luisa F.
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Notes:
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A new type of ventilated facade (VF) with macro-encapsulated phase change material (PCM) in its air
cavity is presented in this paper. Two identical house-like cubicles located in Puigverd de Lleida (Spain)
were monitored during 2012, and in one of them, the VF with PCM was implemented in the south wall.
The versatility of the facade allows the system to reduce both heating and cooling loads. During winter,
the PCM increases the heat storage capacity of the system exposed to solar radiation and during summer
the system can be used as a cold storage unit or as a night free cooling device. From the experimental
winter campaign, important net electrical energy savings were registered due to the use of the VF. On the
other hand, no net energy savings were achieved during summer due to excessive use of mechanical
ventilation. In this paper, an own developed numerical model, based on finite control volume approach,
was validated against experimental data and it is used to select the operational schedule of both solidification
and melting processes in order to achieve net electrical energy savings. During the mild
summer period the system presents a net energy supply of 2.49 MJ/day. This value would be increased by
61.6% if a wooden structure would have been used instead of the current metallic structure. Moreover,
the high hysteresis of the PCM limits strongly the potential of the system in supplying cooling during the
severe summer period.
This work was supported by the “Corporación Tecnológica de
Andalucía” by means of the project “MECLIDE-Soluciones estructurales con materiales especiales para la climatización diferida de
edificios” with the collaboration of DETEA. The work partially
funded by the Spanish Government (ENE2011-28269-C03-01 and
ULLE10-4E-1305) and the European Union (COST Action COST
TU0802), with the collaboration of the City Hall of Puigverd de
Lleida. The authors would like to thank the Catalan Government
for the quality accreditation given to their research group (2009
SGR 534). |
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Subject(s):
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-Ventilated facade
-Phase change materials
-Numerical simulation |
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Rights:
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(c) Elsevier, 2013
info:eu-repo/semantics/restrictedAccess |
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Document type:
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article
publishedVersion |
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Published by:
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Elsevier
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