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[EnergyPlus_Support] Equipment Sizing for best savings - food for thought
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- Subject: [EnergyPlus_Support] Equipment Sizing for best savings - food for thought
- From: "Jean marais" <jeannieboef@xxxxxxxxx>
- Date: Sat, 13 Apr 2013 11:50:33 -0000
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Take chillers...they are often most efficient at about 40% of their full load capacity...ironically in real life projects, I have found that during cooling periods, 40% is about the maximum load they need to deliver. They are off or operating at min. PLR most of the time. Seldom does the demand exceed 60%. This counter intuitively makes sense. The equipment is most efficient for when the most "cooling" power is being delivered.
So, e+ sizes equipment to meet the maximum design loads (which are often somewhat more than what would occur in a typical year). This means that autosizing will "over-size" your equipment by default.
Theoretically, one should do parametric runs at different sizing factors to get the "ideal" equipment sizes. And ideal may in fact mean "over sized".
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