Surface temperature of the specimens when exposed to a source of radiation emitted by a 250 Winfrared radiation lamp, placed 20 cmfromthe samples. The air and surface temperatures of the
specimens were measured with type T thermocouples connected to a DataTaker model DT800 data logging system.Collected datawas saved on a computer every 60 s, for 1.5 h. The sensors were placed in the center of the outer and inner surfaces of the specimens, and in the center of the device developed for the test. This device was made of wood with one side having an
opening (Fig. 2). In each test, temperatures of painted and unpainted samples, exposed to the same incoming infrared energy,weremeasured at the same time in order to compare the effect caused by the paint. The inside air temperature of the device was kept constant in order to avoid accumulation of heat in this space and to assure that the heat absorbed by the roof sheets was exclusively by irradiation and not by convection of the air in contact with the inner surface of the sheet.
Surface temperature of the specimens when exposed to a source of radiation emitted by a 250 Winfrared radiation lamp, placed 20 cmfromthe samples. The air and surface temperatures of the
specimens were measured with type T thermocouples connected to a DataTaker model DT800 data logging system.Collected datawas saved on a computer every 60 s, for 1.5 h. The sensors were placed in the center of the outer and inner surfaces of the specimens, and in the center of the device developed for the test. This device was made of wood with one side having an
opening (Fig. 2). In each test, temperatures of painted and unpainted samples, exposed to the same incoming infrared energy,weremeasured at the same time in order to compare the effect caused by the paint. The inside air temperature of the device was kept constant in order to avoid accumulation of heat in this space and to assure that the heat absorbed by the roof sheets was exclusively by irradiation and not by convection of the air in contact with the inner surface of the sheet.
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