masterThesis
Verificação da existência de imprecisões nos valores do índice de isolamento térmico de vestimenta da norma ISO 9920:2007
Fecha
2012-03-02Registro en:
MOURA, Louisi Francis. Verificação da existência de imprecisões nos valores do índice de isolamento térmico de vestimenta da norma ISO 9920:2007. 2012. 110 f. Dissertação (Mestrado em Engenharia de Produção) – Universidade Tecnológica Federal do Paraná. Ponta Grossa, 2012.
Autor
Moura, Louisi Francis
Resumen
Clothing is one of those items considered as personal protective equipment for working environments. Among different features, clothing is characterized as thermal insulator interfering, therefore, in the thermal exchange between body and environment. The human body with the clothes on can assure it does not allow thermal exchange when it is necessary to avoid the heat exchange with the environment. However, when this exchange is needed, the inadequate clothing affects the thermal balance. The International Standard ISO 9920 identifies the set of garments with an adequate thermal insulation, considering the insulation itself and the water vapor resistance. The values established in the International Standard, based on researches on static mannequin and on standardized conditions, are used as index for Thermal Insulation of Clothing as one of the variables that affect the thermal comfort. Nevertheless, some studies point out that there may be inaccuracies in the values tabulated by ISO 9920, whereas this is a subjective variable and may have greater variability for the user patterns in real situations compared with the standardized clothes used in laboratories, which have the average values used calculated by the Predicted Mean Vote. In this context, this study had the objective of verifying the existence of inaccuracies in the values tabulated by ISO 9920 of the index of Thermal Insulation of Clothing through two statistical methodologies proposed, using as database a field research in an industrial environment of the metal-mechanic sector. It was concluded that the significant inaccuracies in the values of the clothing thermal insulation and the discrepancies between the Predicted Mean Vote and real thermal sensations can be derived from a lack of characterization of the clothes. Therefore, the garment complexity set is a relevant factor for the thermal comfort.