Solar heat gain coefficient of water flow glazings

Sierra, Pablo and Hernandez Ramos, Juan A. (2017). Solar heat gain coefficient of water flow glazings. "Energy and Buildings", v. 139 ; pp. 133-145. ISSN 0378-7788.


Title: Solar heat gain coefficient of water flow glazings
  • Sierra, Pablo
  • Hernandez Ramos, Juan A.
Item Type: Article
Título de Revista/Publicación: Energy and Buildings
Date: 15 March 2017
ISSN: 0378-7788
Volume: 139
Freetext Keywords: water flow glazing, g factor, thermal transmittance, active behaviour, energy management, solar heat gain coefficient (SHGC)
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - Share

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Water flow glazings include a water flowing chamber which enhances their thermal behaviour. This work addresses the connection between the optical properties and the energy performance of this type of glazings. The spectral properties of each layer of the glazing determine the fraction of solar radiation absorbed in each layer, which is later transported by the water in a closed circuit. The methodology requires the optical properties retrieved from the spectral problem and the thermal behaviour is predicted following the classical double glass pane analysis detailed in EN 673 (2011) and EN 410 (2011). The g factor and the U value of this new active glazing are obtained by solving analytically this model. Besides, it is shown that a third parameter, which takes into account the temperature of the inlet water, appears to complete the thermal behaviour of the glazing. In particular, three different configurations are examined. A comparison between these configurations is conducted and the active behaviour of the glazings is explained by means of a variable g factor which depends on the flow rate of the water chamber. The discussion includes some examples for the model parameters. The possibility to control dynamically the g factor provides huge energy saving potentials.

Funding Projects

Horizon 2020680441InDeWaGJuan A. Hernandez (UPM partner)Industrialized Development of Water Flow Glazing Systems

More information

Item ID: 55360
DC Identifier:
OAI Identifier:
DOI: 10.1016/j.enbuild.2017.01.032
Official URL:
Deposited by: Dr. Juan Antonio Hernández Ramos
Deposited on: 05 Jun 2019 12:22
Last Modified: 05 Jun 2019 12:22
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