Materiais de cobertura e suas associações a forros e materiais isolantes no ambiente térmico de protótipos abertos e fechados com vistas a produção de frangos de corte em clima quente

• Main Author: Carvalho, Humberto Garcia de
• Publication Date: 2013
• Format: Doctoral thesis
• Language: por
• Source: LOCUS Repositório Institucional da UFV
• Download full: http://locus.ufv.br/handle/123456789/760
• topic: Ambiência; Construções rurais; Instalações físicas; Ambience; Rural construction, Physical facilities; CNPQ::CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA::CONSTRUCOES RURAIS E AMBIENCIA

Brazil is the world s largest poultry exporter as a result of the significant technological advancements in the productive sector. However, due to typology, materials, and architectural conception typically found in tropical and subtropical climate conditions, open poultry houses present construction limitations due to low thermal damping, especially of roofs, generating heat stress conditions during most of the day and year, and leading to losses. Thus, the use of materials that reflect solar radiation is economically beneficial since it allows reduced heat gain through roofs, known as the parameter most contributing to over-warming in poultry housing construction systems. Similarly, the use of different roof materials, as well as thermal insulation materials or even roof linings may significantly contribute to thermal damping and reduced heat in the aviaries. Thus, two different roofing materials (Galvalume steel tile and fibercement roof shingles) were studied, associated with Foamular insulators and polyethylene linings in open and closed aviaries, on a reduced scale, a representative typology of broiler aviaries in Brazil. The main objective of this work was to test the different types of roof, in combination with insulating materials and linings, aiming at air temperature reduction inside the animal production houses, both under open curtains with natural ventilation and closed curtain conditions, during the hottest times of the day. Data were collected in February and March, 2012. Six aviary prototypes were built at a reduced scale of 1:5. To evaluate the treatments, the following environmental data were measured during the hottest times of the day, both internally and externally: air relative humidity, air temperature, temperature of the superior surface of the roof tile, and air velocity. For environment thermal data acquisition, addressable digital devices (1-wire technology) were used because of their precision, reliability and reduced cost, compared with conventional acquisition data systems. The results showed that thermal insulation treatments presented the lowest air temperature values inside the warehouses. Polyethylene lining played an important role in reducing the internal mean temperature of the prototypes. Natural ventilation was efficient in reducing temperature during the experimental phase when the curtains were pulled open. The Galvalume steel tiles provided milder temperatures to the internal environments than the fiber-cement tiles.