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Evaluation of the thermal efficiency of materials used as roofing systems in poultry houses

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-1901.(doi:10.13031/2013.41593)
Authors:   Ariane Cristina Castro, Iran José Oliveira Silva, Elenilson Sguizzato Bortolini, Maria Luísa Appendino Nunes
Keywords:   Thermal comfort, Tiles, Liners, Broiler chickens

The objective was to evaluate the reduction of radiant thermal load (RTL) and in characteristics related to thermal comfort provided by different combinations of tiles and commercial linings, through reduced and distorted scale models. This aimed to evaluate the efficiency of lining as an element to attenuate solar radiation two types of tiles (ceramic and fibrous cement) were studied associated with three different liners (linings A and B and thermal reflective C). The liners A and B, were installed under the inside part of the roof in the scale models and the thermal reflective blanket C was placed over the installation in order to simulate the thermal comfort provided by the roof shading. Meteorological variables were recorded, to the subsequent calculation of thermal comfort environmental indexes (enthalpy, black globe temperature and humidity index GTHI and radiant thermal load). Variations on the surface temperature of tiles and liners were also recorded to identify the spatial variation of temperature at different times of the day. The results showed a statistical difference between the materials used for roofing and lining. Liner B presented the highest reductions of RTL and GTHI values. The thermal mapping of the surface temperature of tiles showed that the lowest temperature were found in fibrous cement roofs white painted, while the highest surface temperatures were found in the unpainted ceramic tiles. The use of roof shading in reduced and distorted scale models did not improve the thermal conditions of the evaluated environment.

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