Termografia por infravermelho para avaliação do conforto térmico ambiental

Abstract

The supply of natural shadow is one of the most efficient practices in the microclimate modification to provide a comfortable ambient. Thermography Infrared appears as a potential methodology to measure the microclimate and its effect on the thermal comfort, for being a non-invasive method and practical use. The objective of to evaluate the use of infrared thermography as method for the diagnosis the thermal comfort afforded by arboreal species. The experiment was conducted at Embrapa Beef Cattle in Campo Grande, state of Mato Grosso do Sul, from June to August 2015. Were evaluated the microclimate provided by four native species of Brazilian Cerrado. The evaluations were conducted from 8:00 a.m. to 4:00 p.m., local time (GMT -4:00), with one-hour intervals, recording the microclimate parameters: air temperature, dew-point temperature, black globe temperature, relative humidity and wind speed, the sun and shade. Subsequently, the thermal comfort indices, temperature and humidity index, the black globe temperature and humidity index and radiant thermal load were calculated. The configuration of the shadow was evaluated in the same months. Radiation was measured by quantum sensors (photosynthetically active radiation), pyranometer (solar radiation) and photometro (luminosity). Thermographic images were obtained and later analyzed using the appropriate software. The data collected were submitted to multiple factor analysis. Positive linear correlation between the thermal imaging and the following variables: temperature measurements (0.854), thermal comfort indices (0.778) and radiation (0.768) was observed. Thus, one can conclude that the infrared thermography is a potential predictor of microclimate variables and thermal comfort.