what comfort radiant temperature weighting means ?

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I suggest you to check DesignBuilder program help, more specifically at the sub-chapter "Comfort Radiant Temperature Calculation" https://designbuilder.co.uk/helpv6.0/...

In summary:

This field specifies the type of Mean Radiant Temperature (MRT) calculation the user wishes to use for the thermal comfort model. There are currently two options:

1-Zone averaged where the standard MRT is used in comfort calculations.

2-Surface with largest window which calculates the radiant temperature for a person close to the largest window in each zone.