The purpose of this study was to compare the globe Thermometers for the monitoring of outdoor thermal comforts at summer days. At a height of 1.2m above the grass field, the value of standard globe temperature(SG, ∅150㎜) was compared with two different types of small globe Thermometers. The one was ...
The purpose of this study was to compare the globe Thermometers for the monitoring of outdoor thermal comforts at summer days. At a height of 1.2m above the grass field, the value of standard globe temperature(SG, ∅150㎜) was compared with two different types of small globe Thermometers. The one was composed with brass ball(BG, ∅50㎜) and the other was plastic table tennis ball(TG, ∅40㎜) painted in matt black. With those globe temperatures, the air temperature(AT), the wind speed(WS) and the solar radiation(SR) were recorded every minute from 1st of June to 31th of October 2013. Based on the 86,120 records of 103 sunny days, the time serial characteristics of the meters and weather condition were analysed. And, the statistical analysis about the difference between the three type of globe Thermometers and relationships with the air temperature, the wind speed and solar radiation was done. The major findings were as follows; 1. At the nighttime, the average temperatures of all meters were very similar within ± 1℃. But, At the daytime, the temperatures of the meters were apparently different. The average value of BG was the highest(38℃), TG(34.9℃) was the next, SG(32.2℃) was the third, and AT(31.2℃) was the lowest. 2. According to the results of correlation analysis between the value of sensors and the solar radiation, the BG was the most tightly correlated showing the coefficient 0.81, while the SG(co.=0.74) was the loosest. The TG(co.=0.76) was the more tighter than the SG but looser than the BG. 3. The correlation between the value of sensors and the wind speed were the looser than those of solar radiation. The SG was the most tightly correlated with wind speed showing the coefficient 0.54, while those of TG and SG were 0.50 and 0.49 respectively. 4. According to the results of regression analysis of the value of sensors with the solar radiation and wind speed at the 5% confidence level, the R2 of BG was 0.82 the highest. Those of TG and SG were 0.78 and 0.75 respectively, while that of AT was 0.74. In summary, the BG was the most sensitive to the variation of solar radiation and wind speed, the TG was the second and the SG was the last. Which means that the smaller diameter and the more conductive materials are recommended for the globe Thermometers. The small brass ball was that one in this study. Considering the international standard indexes of human thermal comfort(MRT, WBGT, etc.) are based on the value of standard globe temperature(SG), the TG can be good alternative for the SG, because it has tighter correlation and more similar regression characteristic with SG, and the cheaper than BG in the actual field application.
The purpose of this study was to compare the globe Thermometers for the monitoring of outdoor thermal comforts at summer days. At a height of 1.2m above the grass field, the value of standard globe temperature(SG, ∅150㎜) was compared with two different types of small globe Thermometers. The one was composed with brass ball(BG, ∅50㎜) and the other was plastic table tennis ball(TG, ∅40㎜) painted in matt black. With those globe temperatures, the air temperature(AT), the wind speed(WS) and the solar radiation(SR) were recorded every minute from 1st of June to 31th of October 2013. Based on the 86,120 records of 103 sunny days, the time serial characteristics of the meters and weather condition were analysed. And, the statistical analysis about the difference between the three type of globe Thermometers and relationships with the air temperature, the wind speed and solar radiation was done. The major findings were as follows; 1. At the nighttime, the average temperatures of all meters were very similar within ± 1℃. But, At the daytime, the temperatures of the meters were apparently different. The average value of BG was the highest(38℃), TG(34.9℃) was the next, SG(32.2℃) was the third, and AT(31.2℃) was the lowest. 2. According to the results of correlation analysis between the value of sensors and the solar radiation, the BG was the most tightly correlated showing the coefficient 0.81, while the SG(co.=0.74) was the loosest. The TG(co.=0.76) was the more tighter than the SG but looser than the BG. 3. The correlation between the value of sensors and the wind speed were the looser than those of solar radiation. The SG was the most tightly correlated with wind speed showing the coefficient 0.54, while those of TG and SG were 0.50 and 0.49 respectively. 4. According to the results of regression analysis of the value of sensors with the solar radiation and wind speed at the 5% confidence level, the R2 of BG was 0.82 the highest. Those of TG and SG were 0.78 and 0.75 respectively, while that of AT was 0.74. In summary, the BG was the most sensitive to the variation of solar radiation and wind speed, the TG was the second and the SG was the last. Which means that the smaller diameter and the more conductive materials are recommended for the globe Thermometers. The small brass ball was that one in this study. Considering the international standard indexes of human thermal comfort(MRT, WBGT, etc.) are based on the value of standard globe temperature(SG), the TG can be good alternative for the SG, because it has tighter correlation and more similar regression characteristic with SG, and the cheaper than BG in the actual field application.
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