Question-and-Answer Resource for the Building Energy Modeling Community
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@obuchely, I interpret your primary question to be: "In addition to annual energy simulation, can I use EnergyPlus for load calculation and equipment sizing?" The answer to that is yes, EnergyPlus supports this use case. In fact, Trane's TRACE team is working with the EnergyPlus development team on improving the sizing routines—in a non-Trane specific way, of course. There are already some interfaces that use EnergyPlus in this capacity--one example is Sefaira Systems. As for whether OpenStudio is less "boring" than TRACE, well that's a matter of taste. :)
