QUALIDADE DOS DADOS DO ÍNDICE DE BULBO ÚMIDOTERMÔMETRO DE GLOBO (IBUTG) COLETADOS COM INSTRUMENTOS AUTOMÁTICOS EM AMBIENTE EXTERNO
Palavras-chave:
Temperature measurement, Occupational heat, Thermal stress, WBGT IndexResumo
Excessive environmental heat can cause illnesses and deaths of construction workers. Environmental assessment specifies the preventive measures to avoid overload and its consequences on health. The most accepted method for occupational exposure is the Wet Bulb Globe Temperature Index (WBGT) comparison with permissible exposure limits. The traditional method is considered more accurate, by measuring natural wet-bulb temperature (Twb), dry-bulb temperature (Tdb) and black-globe temperature (Tg), from their respective mercury thermometers. Nowadays it is being replaced by automatic dataloggers that capture and record measured data. The aim of this work is to evaluate the quality of the so obtained data, by comparing them to those from mercury thermometers, as well as to develop more accurate mathematical algorithms for acquiring Twb, Tdb and Tg from measurements through QuestTemp36TM electronic equipment. Data from the two sets of equipment were collected on concrete slabs and grass, during six days in March 2017. The results for the WBGT with the two systems were tested statistically through linear regressions, which resulted in determination -values < 0.0001. These results show that it is possible to improve the accuracy of the measurements performed with automatic instruments through equations of the linear regression method.
Referências
BERNARD, T. E; BARROW, C. A. Empirical Approach to Outdoor WBGT fromMeteorological Data and Performance of Two Different Instrument Designs. IndustrialHealth, 2013, v.51, p.79 85.
BLAND, J.M.; ALTMAN, D.G. Measuring Agreement in Method Comparison Studies.
Statistical Methods in Medical Research, 1999, v.8, p.35-160.BRASIL. Portaria n.º 3.214Regulamentadoras- NR do cap. V, Título II, da Consolidação das Leis do Trabalho,. Acesso em: 18 out. 2017.
FUNDACENTRO FUNDAÇÃO JORGE DUPRAT FIGUEIREDO DE SEGURANÇA E MEDICINADO TRABALHO. Norma de Higiene Ocupacional n. 06 (NHO 06): Avaliação daexposição ao calor. Procedimentos técnicos. Brasília: Ministério do Trabalho ePrevidência Social, 2002, 50p.
ISO INTERNATIONAL STANDARDIZATION FOR ORGANIZATION. ISO 7243: Hotenvironments - Estimation of the heat stress on working man, based on the WBGTindex(Wet Bulb Globe Temperature). British Standard. Genebra, Suiça, 1989. 26p.
__________ISO 7726: Ergonomics of the thermal environment -- Instruments formeasuring physical quantities. British Standard. Genève, Switzerland, 2001, 62p.
MAIA, P. A.; RUAS, A. C.; BITENCOURT, D. P. Wet-bulb globe temperature indexestimation using meteorological data from São Paulo State, Brazil. InternationalJournal of Biometeorology, 2015, v. 59, n. 10, p. 1395 1403.
Monitors. , 2006. 37p. Disponível em:<https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-QUESTemp-36-Heat-Stress-Monitor>. Acesso em: 17 maio 2016.
PARSONS, Ken. Heat stress standard ISO 7243 and its global application. IndustrialHealth, 2006, v. 44, n. 3, p. 368 379.
__________. Occupational health impacts of climate change: current and future ISOstandards for the assessment of heat stress. Industrial Health, 2013, v. 51, n. 1, p. 86100.
R PROJECT for Statistical Computing. R Foundation for Statistical Computing.
Copyright (C) 2017. versão 3.4.0. Disponível em: < https://www.r-project.org/>. Acessoem: 13 ago. 2017.
