Dear Jean,
I may be missing something her because I did not go through all of the past conversation, however:
· If you are using a radiant heating system, you are not modeling a “baseline” model and you should be sizing with actual capacity (using a specified value), not autosizing. For an actual system, you should not need any Sizing:xxx objects at all.
o When using actual sizes, I suspect that you will find the heating coil for the air loop has only enough capacity to heat the air approximately to the room temperature. This will result in the air loop having inadequate capacity for zone heating and the radiant system will do most of the work.
· Just clarifying: The unmet loads are determined by the zone temperature compared to the zone setpoint, not the air loop setpoint.
I hope that is helpful J
The Building Performance
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