Inside Movable Insulation causing increased heat loss

[mjwitte]

Issue overview

User test file shows that inside movable insulation results are nowhere near equivalent results with the insulation layer included in the base construction. In fact, the heating load increases significantly with the inside movable insulation. Outside movable insulation results are reasonably close to the equivalent construction.

Test file results (run with USA_CO_Denver-Stapleton.724690_TMY.epw):

Filename	Insulation Location	Method	District Heat	District Cool	% diff MI vs Constr, Heating	Cooling
MovableIntInsulationLights-NoInsulation	None		28033	10345
MovableIntInsulationLights-Outside-Construction	Outside	Construction	14983	5836
MovableIntInsulationLights-Outside-MovIns	Outside	MI	14516	6040	-3%	+3.5%
MovableIntInsulationLights-Inside-Construction	Inside	Construction	14263	6577
MovableIntInsulationLights-Inside-MovIns	Inside	MI	33583	10303	+135%	+57%

Note that the inside movable insulation case has a significantly higher heating load than the base case with no insulation.

Details

Some additional details for this issue (if relevant):

• Version of EnergyPlus 24.2
• Unmethours 48835 and helpdesk ticket 16142.

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added EnergyPlusDevSupport\DefectFiles
• Ticket added to EnergyPlus Defect Complexity (Github Project)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)