 |
However, the comfortability of the user is one of the crucial necessities of the electrical applications. Therefore, the idea of the user¡¯s temperature tracing system has been developed in this study. Originally, the thermal comfortable is defined by Fanger and standardized by ISO 7730. Fanger hypothesized that user¡¯s thermal comfort was intuitively decided by one¡¯s skin temperature and their sweat secretion. The trade-off of the two factors narrowed the comfortability in a little range. Furthermore, ISO 7730 formulized the equations of comfortability. In comfortable conditions, the person almost does not sweat, the physical workload is low, the clothing is light, there is almost no heat radiation, and the air temperature is between 18 and 25 ¡ÆC. Therefore, thermal comfortable is described by tow indexes. One is the prediction of the mean value of votes of a group of occupants on a seven-point thermal sensation scale (PMV), the other is the index that establishes a quantitative prediction of the percentage of thermally dissatisfied occupants (i.e., too warm or too cold), can be determined (PPD). Fanger established a model of correlation between the subjective human perception, expressed through the vote of comfort on a scale ranging from -3 (very cold) to +3 (very hot), and the difference between the heat generated and the heat released by the human body. The ranges of PMV values from -0,2 to 0,2, -0,5 to 0,5 and -0,7 to 0,7 map to PPD values below 6, 10 and 15%, respectively. The distribution of PMV v.s. PPD displays the thermal comfortable in a form of quantitative analysis which was presented in this study to compare the thermal comfortable between with and without the function of user¡¯s temperature tracing. |
IEEE/ICACT20220117 Slide.05
[Big Slide]