Estimativa da temperatura de globo negro a partir da temperatura de bulbo seco
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Data
2011-05-23
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Editor
Engenharia na agricultura
Resumo
Uma desvantagem para se fazer o diagnóstico bioclimático de uma determinada região é a inexistência de medições da
temperatura de globo negro (TGN) nas estações meteorológicas distribuídas ao longo do país. Dessa forma, propõem-
se equações para estimar a temperatura de globo negro a partir da temperatura de bulbo seco (TBS), para animais
criados confinados e ao ar livre. Foram utilizados dados de TGN eTBS medidos dentro e fora dos aviários, analisados
utilizando um modelo de regressão para predizer a TGN em função de TBS. Foram utilizados 5664 dados para análise
da temperatura interna e 337 dados para a temperatura externa. As análises foram realizadas por meio do software
estatístico R. Observou-se uma forte relação entre a temperatura de globo negro e a temperatura de bulbo seco. Dessa
forma, para animais alojados em ambientes cobertos com temperatura de bulbo seco entre 0 e 35 o C, é possível estimar
o TGN a partir da TBS. O modelo de regressão linear ajustado aos dados apresentou R2 de 0,9788 e coeficiente de
correlação de 0,9893. Nos dados de temperatura externa, a relação de TGN e TBS não é tão evidente. Esse fato ocorreu
devido à forte influência da radiação solar no termômetro de globo negro. É possível estimar a TGN a partir da TBS
para ambiente coberto e ao ar livre.
One disadvantage of bioclimatic diagnosis in certain region is non-availability of black globe temperatures (BGT) in the meteorological stations situated in different parts of the country. This study was done to propose a equation to estimate BGT from the dry bulb temperature (DBT), in confined and outdoors systems. Data of BGT and DBT were collected from inside and outside poultry sheds and analyzed using regression models to predict BGT from DBT data. A total of 5664 and 337 temperature readings were obtained from inside and outside poultry house, respectively. A statistical analysis was done with the use of statistical software R. A strong correlation was found between BGT and DBT. It was concluded that in chickens sheds with DBT between 0 and 35 o C, BGT can be estimated using DBT readings. Adjusted linear regression model had R2 of 0.9788 with correlation coefficient of 0.9893. The relationship was not so evident for temperatures outside the measured readings, due to strong effect of the solar radiation on black globe thermometer. It is possible to estimate BGT from DBT readings obtained from internal or external environment.
One disadvantage of bioclimatic diagnosis in certain region is non-availability of black globe temperatures (BGT) in the meteorological stations situated in different parts of the country. This study was done to propose a equation to estimate BGT from the dry bulb temperature (DBT), in confined and outdoors systems. Data of BGT and DBT were collected from inside and outside poultry sheds and analyzed using regression models to predict BGT from DBT data. A total of 5664 and 337 temperature readings were obtained from inside and outside poultry house, respectively. A statistical analysis was done with the use of statistical software R. A strong correlation was found between BGT and DBT. It was concluded that in chickens sheds with DBT between 0 and 35 o C, BGT can be estimated using DBT readings. Adjusted linear regression model had R2 of 0.9788 with correlation coefficient of 0.9893. The relationship was not so evident for temperatures outside the measured readings, due to strong effect of the solar radiation on black globe thermometer. It is possible to estimate BGT from DBT readings obtained from internal or external environment.
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Palavras-chave
Índices, Conforto térmico, Calor radiante