Abstract
ABSTRACT The challenges for the use of the cross-laminated timber (CLT) system in the Brazilian agricultural market are significant. This study evaluated the thermal performance of fiber cement tiles associated with a CLT non-conventional structure compared to those of ceramic, fiber cement and aluminum roof tiles based on following thermal comfort indexes (i.e., black globe humidity index (BGHI), radiant heat load (RHL) and specific enthalpy) using physical conventional models of reduced-scale rural facilities under summer conditions. The non-conventional CLT model comprised closing walls and a lining that form a self-supporting structure with few air inlets. This model presented reduced thermal comfort indexes compared to the other conventional roofs. Moreover, the CLT model has an average black globe temperature (Tbg) of 32.9 °C, which was lower at all times compared to those of the other roofs. In conclusion, the roof with fiber cement tiles associated with the CLT structure exhibited the best performance in terms of thermal comfort, followed by the ceramic, fiber cement, and aluminum tiles. The study results allow a better understanding of the opportunities for CLT usage.
Highlights
Thermal sensation depends on the building material properties, including its surface temperatures and the facility of heat exchange with the medium
This study aims to evaluate the thermal performance of a fiber cement roof associated with the cross-laminated timber (CLT) structure compared to those of clay, fiber cement, and aluminum roof tiles in reduced models of rural facility based on the thermal comfort indexes of BGHI, RHL, and effectiveness under the conditions of the summer season temperature
TfcCLT - corrugated fiber cement tiles mounted on the structural lining of the CLT formed by a self-supporting structure; TCN - ceramic tiles; TFCN - corrugated fiber cement tiles; and TAL - corrugated aluminum tiles
Summary
Thermal sensation (i.e., cold or hot) depends on the building material properties, including its surface temperatures and the facility of heat exchange with the medium. When exposed to solar radiation and other sources from the outside, tiles and walls cause hot environments internally, which produces thermal discomfort. New and unconventional materials must be evaluated to assess their thermal performance in agricultural facilities. Adekunle & Nikolopoulou (2018), Leiva et al (2018), and Kollár & Štefko (2016) evaluated buildings using the CLT technique, aiming at thermal comfort in urban environments occupied by people; they obtained satisfactory results. Studies on the use of this technology in agricultural facilities are scarce
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