The extreme value of physiological equivalent temperature

Hi,
I’m seeking a deeper understanding of PET in Ladybug.
I’ve come across the updated version of PET which includes the proposal discussed here: · Issue #4 · ladybug-tools/ladybug-comfort · GitHub](correction proposal for the PET calculation · Issue #4 · ladybug-tools/ladybug-comfort · GitHub)
The discussion and attached paper are very informative and has clarified many aspects of PET and why the current version yields different results compared to the legacy version.
However, I’ve noticed that the maximum PET value in the updated version is capped at 60°C, unlike the legacy version which can produce values above this threshold.

So my questions are that:

  • Is there a reference or explanation for why this upper threshold of 60°C is applied in the updated version?
  • Are there any boundary conditions for the input parameters such as air temperature, mean radiant temperature, relative humidity, and wind speed? For instance, is it possible to input an air temperature of 60°C as such extreme temperatures are rarely encountered in real life?