Ceiling voids....
I suspect that some of the gap between predictions and actual performance is
down to our attempts to ignore parts of a building we cannot see (and where care and
attention on site are also often sub-standard). I have seen ceiling voids 5-10C over
the occupied space leading to radiant comfort issues. Warm ceiling voids can also impact
raised floors above them.
For the last decade I have always explicitly represented such spaces. It is
not 'far too time consuming' when it leads to better performance
information
and helps us design out excess temperatures within such spaces.
-Jon Hand, Glasgow Scotland, IBPSA fellow.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx> on behalf of Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]
<EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: 22 September 2020 08:10
To: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: [EnergyPlus_Support] Dedicated ceiling void model object
Dear Colleagues,
Should a viability study of developing a ceiling void model be made? The effect on room temperature response / behaviour when modeling a plenum zone vs. modeling an air layer in the ceiling buildup is not clear. The effect on yearly energy usage regarding
using a plenum zone vs. modeling an air layer in the ceiling buildup is not clear. If it is significant, then it must be noted that modeling large buildings with many zones, each with an extra plenum zone is currently far too time consuming both in input and
execution.
Does anyone have experience in this regard?
Jean