Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Regardless of design question "why on Earth do you need to do this..?" the only thing you do is controlling the temperature of the air between the panes. What in return changes the U-value of the window. If the flow is enough to neglect the changes in air temperature: U'=Uglas(Tglas-Tin)/(Tout-Tin) This equation represents the energy balance from space point of view - we don't consider the amount of energy to support needed Tglas. Then, as I see, there is only one way to model variable U-value - to change surface convection coefficient by EMS actuator. Or to create a set of simple glazing systems with a range of possible U-values and apply their constructions by the same EMS actuator for construction stage. In any way you will have much more research tasks than real results.
