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OpenStudio translates OS:SubSurface objects to the equivalent EnergyPlus FenestrationSurface:Detailed object type. Multipliers assigned to the subsurfaces are translated directly to that object, and represent the number of identical surfaces that exist on the base surface. In this way if you had multiple exact windows on that surface, but didn't want to explicitly draw them (or simplify them into one big window), you could use the multiplier field as an easy way to get the effect of additional windows.

Internal load objects (lights, equipment, etc) in EnergyPlus don't have native 'Multiplier' input fields. Looking at the code that translates the OpenStudio inputs to EnergyPlus inputs, it's pretty clear that the load definition multipliers are applied to whatever value is used to define the power for that load (either design level, power per unit area or power per person) and the 'multiplied' value used in the EnergyPlus object. Thus if you wanted to model a room with ten computers, instead of defining the total power for all ten, you could set up your load to reflect the power of a single computer, and assign a multiplier of ten.

I'm pretty sure there is no multiplier input for the infiltration load; the spacing of that column in the Spaces tab is just weird.

OpenStudio translates OS:SubSurface objects to the equivalent EnergyPlus FenestrationSurface:Detailed object type. Multipliers assigned to the subsurfaces are translated directly to that object, and represent the number of identical surfaces that exist on the base surface. In this way if you had multiple exact windows on that surface, but didn't want to explicitly draw them (or simplify them into one big window), you could use the multiplier field as an easy way to get the effect of additional windows.

Internal load objects (lights, equipment, etc) in EnergyPlus don't have native 'Multiplier' input fields. Looking at the code that translates the OpenStudio inputs to EnergyPlus inputs, it's pretty clear that the load definition multipliers are applied to whatever value is used to define the power for that load (either design level, power per unit area or power per person) and the 'multiplied' value used in the EnergyPlus object. Thus if you wanted to model a room with ten computers, instead of defining the total power for all ten, you could set up your load to reflect the power of a single computer, and assign a multiplier of ten.

I'm pretty sure there is no multiplier input for the infiltration load; the spacing of that column in the Spaces tab is just weird.