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Cooling ceiling, associated thermal confort and condensation risks.

Plafond rafraîchissant, confort thermique associé et risques de condensation.

Author(s) : CATALINA T., VIRGONE J.

Type of article: Article

Summary

With a cooled ceiling, the temperatures of a room's surfaces are lower than with air conditioning solutions and the same is true when other partition surfaces are cooled. The sensation of comfort produced by a cold ceiling can be compared to that felt during a summer night where one feels the freshness of the sky even if the ambient air temperature can be higher than 25°C. In principle, a cooled ceiling is not very different from a radiator with tubes or plates. Cold water circulates in the elements of a capillary mat, cooling the visible surface of the ceiling and exchanging by radiation with the bodies located in the room. Condensation represents the sensitive point of cooled ceilings but this situation can be easily avoided with either the use of a probe fa measure the dew point or with appropriate ventilation. This communication presents the modelling and simulation of a cooled ceiling using capillary mats as the means of energy transportation. The radiant ceiling has been simulated in a virtual room created with the help of software tool called TRNSYS [1]. This has been used to study the thermal comfort, the interior air temperature and other specific parameters of the ceiling. We have carried out simulations for several cities in France in order to see the influence of the climate, and in particular that of the outside humidity, on the room behavior and on condensation risks on the ceiling surface.

Details

  • Original title: Plafond rafraîchissant, confort thermique associé et risques de condensation.
  • Record ID : 30012079
  • Languages: French
  • Source: Revue générale du Froid & du Conditionnement d'air - vol. 103 - n. 1145
  • Publication date: 2014/07

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