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Radiant cooling and dehumidification system coupling: comfort and energy analysis for residential buildings.

Number: pap. n. 162

Author(s) : CARLI M. de, PERETTI C., ZARRELLA A., et al.

Summary

The development of radiant cooling has stimulated the interest towards new system solutions based on coupling the ventilation strategy with radiant cooling. Radiant cooling systems may cause condensation on the active surface under hot and humid conditions during the cooling season. This phenomenon occurs when surface temperature falls below dew point. To avoid condensation it is important to reduce air humidity with dehumidification devices or mechanical ventilation system. In this regard, the possibilities are essentially twofold: on the one hand there are dehumidification devices that reduce humidity with no coupling to ventilation, i.e. the air inside the room is dehumidified and ventilation is left to a simple infiltration system; on the other hand, mechanical ventilation systems may have dehumidifying finned coils. In order to analyze the building-plant system of a typical residential dwelling in a multi-storey building, the simulation tool DIGITHON Multizone (developed by the University of Padova) was used. This model is based on the resolution of the equations of balance in the room, by means of the transfer functions for solving the problem of unsteady state thermal conductivity through walls. Six different solutions in different climatic conditions were analyzed: radiant cooling without dehumidification, radiant cooling with a soft dehumidification device, radiant cooling with a dehumidification device which supplies sensible cooling as well, radiant cooling with a mechanical ventilation system which provides dry and cool air and radiant cooling coupled with a fan coil. The aim of this work is to compare different HVAC coupling solutions, in terms of indoor environmental comfort and energy savings, highlighting the importance of air handling with radiant cooling systems.

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Pages: 10 p.

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Details

  • Original title: Radiant cooling and dehumidification system coupling: comfort and energy analysis for residential buildings.
  • Record ID : 30008762
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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