Abstract
Our aim is to determine the more significant parameters acting on the water vapor condensation in a partly closed structure, submitted to external constraints (temperature and humidity) which induce convective movements and thermal variations inside. These constraints locally lead to condensation of the water vapor, initially contained in the air of the volume and/or on the walls. The inside bottom wall is remained dry. Condensed water quantities depend on: (1) dimensions of the structure, (2) the air renewing and its hygrometry, and (3) the phase between thermal and hydrometric conditions. Peculiar conditions are needed to obtain a maximum of condensation.
Highlights
A lot of experimental and fundamental works have shown the possibility to condense the water vapor contained in ambient air with a view to recover it
Muselli et al [2] studied a dew water collector for potable water in Ajaccio. In their investigations concerning the mechanism of soil water vapor adsorption in arid regions, Beysens et al [3] concluded that “there are areas in which, during the dry season, the dominant process is vapor adsorption, and dew formation is a rare occurrence.”
This study and several others on the same subject shows the importance to characterize the main parameters intervening in the formation of water vapor condensation, in arid regions
Summary
A lot of experimental and fundamental works have shown the possibility to condense the water vapor contained in ambient air with a view to recover it. The aim of this study is to determine the more significant parameters acting on the conditions of the water vapor condensation present in air, inside a closed or partly closed structure (Batina et al [7], and Batina et al [8]) An illustration of such phenomena can be found in the case of the Arles-sur-Tech (France) sarcophagus (nonwatertight) Beysens et al [9], Perard and Leborgne [10], the marble walls dimensions of which result in an about 0.33 m3 internal volume. This structure is submitted to external atmospheric conditions (temperature and humidity) which generate convective movements and thermal variations inside this space. The study, as a function of φ, on the dynamical and thermal behaviour and on the condensation effects, shows the existence of an optimum of condensation linked with this parameter φ
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