Permeable coverings

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Orosa, JA (Author) Other; Armando C. Oliveira (Author) FEUP

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00H-04Y

DOI: 10.1007/978-1-4471-2336-1_5

Abstract (EN): In the past few years, permeable external coverings and impermeable internal coverings of plastic emulsion paints have not been recommended by architects and engineers. This is related to the fact that partial vapour pressure inside the building, which is higher than outdoors, may drive water vapour through walls and condense in some zones damaging the walls. To prevent this effect, impermeable internal and external coverings are employed. However, the permeable covering effect can be employed to control indoor environments as a passive method, reducing energy consumption. Concrete walls with permeable coverings may have a similar effect to wooden structures. This effect has not been analysed in real indoor environments and, hence, the need for research in this area. This investigation must consider the periods when these materials are more effective, through building simulation for long periods of time. Moisture storage capacity of building materials, in real case studies, revealed a minimum of a 2-week working period after a change in weather conditions. As observed earlier, the effect of hygroscopic materials to control indoor environments can reduce the HVAC system operating time and, hence, reduce or even replace (in extreme cases) conventional energy consumption. This chapter shows results of the effect of permeable coverings on indoor environments. Specifically, the methodology to define their working periods in real buildings is defined. Later, their effects or energy consumption are analysed, as well as thermal comfort and related health effects. Building characteristics such as construction, ventilation rate and working period are described, as well as measuring processes and equipment.

Language: English

Type (Professor's evaluation): Scientific