Question-and-Answer Resource for the Building Energy Modeling Community
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You might want to consider just using a spreadsheet for a data center, unless you think it really needs to be modeled in energy simulation. I know this is a cop out answer, but when the internal loads begin to dominate, the envelope loads become insignificant. This is what I've done for Facebook datacenters that I've modeled and submitted to LEED.
It is pretty easy to develop a spreadsheet using hourly weather data, fan curves, and internal gains with some logic and equations for economizer hours. Hope this is helpful.
