Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Heat transfer and mass flow correlations for ventilated facades
Highlights ► Natural convection heat transfer and mass flow phenomena in ventilated facades are numerically investigated. ► New specific correlations to obtain the Nusselt number for each wall separately of ventilated façades. ► New specific correlations to obtain the induced mass flow in the channel.
Abstract Natural convection heat transfer and mass flow phenomena in ventilated facades are numerically investigated in this work. The study focuses on the determination of accurate results in terms of correlations for the average Nusselt number at each of the two walls of the ventilated facade and for the mass flow induced in the cavity, as functions of the descriptive geometrical and thermal parameters, covering the laminar region with modified Rayleigh numbers Ra b* ranging from 100 to 105. Comparison with available experimental data and numerical results is first presented to validate the validity of the numerical procedure. Then correlations are proposed for the heat and the mass flow in symmetrically and asymmetrically heated channels. These correlations are developed as a contribution for the thermal models of ventilated facades, in which the accurate determination of heat transfer coefficients and induced mass flow rates are of great importance to establish the energetic performances of the element.
Heat transfer and mass flow correlations for ventilated facades
Highlights ► Natural convection heat transfer and mass flow phenomena in ventilated facades are numerically investigated. ► New specific correlations to obtain the Nusselt number for each wall separately of ventilated façades. ► New specific correlations to obtain the induced mass flow in the channel.
Abstract Natural convection heat transfer and mass flow phenomena in ventilated facades are numerically investigated in this work. The study focuses on the determination of accurate results in terms of correlations for the average Nusselt number at each of the two walls of the ventilated facade and for the mass flow induced in the cavity, as functions of the descriptive geometrical and thermal parameters, covering the laminar region with modified Rayleigh numbers Ra b* ranging from 100 to 105. Comparison with available experimental data and numerical results is first presented to validate the validity of the numerical procedure. Then correlations are proposed for the heat and the mass flow in symmetrically and asymmetrically heated channels. These correlations are developed as a contribution for the thermal models of ventilated facades, in which the accurate determination of heat transfer coefficients and induced mass flow rates are of great importance to establish the energetic performances of the element.
Heat transfer and mass flow correlations for ventilated facades
Suárez, Christian (Autor:in) / Joubert, Patrice (Autor:in) / Molina, José L. (Autor:in) / Sánchez, Francisco J. (Autor:in)
Energy and Buildings ; 43 ; 3696-3703
03.10.2011
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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