Paper 2
Flow Pattern Effects on Night
Cooling Ventilation
Jose
Manuel Salmerón Lissen1, Juan Antonio Sanz Fernández1,
Francisco José Sánchez de la Flor2,
Servando Álvarez Domínguez1 and Álvaro Ruiz Pardo1
1Universidad de Sevilla. Departamento de Ingeniería Energética. Grupo de
Termotecnia,
Escuela Superior de
Ingenieros. Camino de los Descubrimientos s/n, 41092 Sevilla, Spain.
2Escuela Superior de Ingeniería. Departamento de Máquinas y Motores Térmicos.
Universidad de Cádiz.C/
Chile 1, 11002 Cádiz, Spain.
Abstract
Passive cooling techniques such as night time cross
ventilation can potentially provide substantial cooling energy savings in
warm climates. The
efficiency of night cooling ventilation is determined by three main
factors: the external airflow rate in the room, the flow pattern and the
thermal mass distribution. The aim of this paper is to analyse the effect
of the enclosure shape and the situation of inlet/outlet openings on the
total cooling energy stored in the structure. This analysis presents a
comprehensive sample of typologies to generate guidelines which can help
the designer with the distribution of the thermal mass and inlet/outlet
openings in the enclosure. The
approach combines a theoretical analysis which characterizes the enclosure
charge/discharge time constants and storage efficiencies with simulation
studies based on computational fluid dynamics software (CFD).
Key words: night
cooling ventilation, computational fluid dynamics software (CFD), heat
transfer coefficients.
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