Mean radiant temperature (Tmrt) values were calculated and compared to each other in Taiwan based on the six-directional and globe techniques. In the case of the six-directional technique (measurements with pyranometers and pyrgeometers), two different Tmrt values were calculated: one representing the radiation load on a standing man [Tmrt(st)] and the other which refers to a spherical reference shape [Tmrt(sp)]. Moreover, Tmrt(Tg) was obtained through the globe thermometer technique applying the standard black globe. Comparing Tmrt values based on the six-directional technique but with different reference shapes revealed that the difference was always in the +/−5 °C domain. Of the cases, 75 % fell into the +/−5 °C Delta Tmrt range when we compared different techniques with similar reference shapes [Tmrt(sp) and Tmrt(Tg)] and only 69 % when we compared the different techniques with different reference shapes [Tmrt(st) and Tmrt(Tg)]. Based on easily accessible factors, simple correction functions were determined to make the Tmrt(Tg) values of already existing outdoor thermal comfort databases comparable with other databases which involve sixdirectional Tmrt. The corrections were conducted directly between the Tmrt(Tg) and Tmrt(sp) values and also indirectly, i.e., by using the values of Tg to reduce the differences between Tmrt(sp) and Tmrt(Tg). Both correction methods resulted in considerable improvement and reduced the differences between the Tmrt(sp) and the Tmrt(Tg) values. However, validations with an independent database from Hungary revealed that it is not suggested to apply the correction functions under totally different background climate conditions.
All Science Journal Classification (ASJC) codes
- Atmospheric Science