[EnergyPlus_Support] Re: Equipment Sizing for best savings - food for thought

["Jean marais" <jeannieboef@xxxxxxxxx>]

Life Cycle Savings require "baseline" equipment sizing. The 90.1 standard has two approaches: 
ECB - both baseline and preposed modeled autosize to find the "ideal" equipment size. Then both apply the same oversizing factor which is that of the real equipment / the preposed "ideal" sized eqipment.
PRM - (appx G) uses a set oversizing for the baseline case.

In all of this there is a fundimental issue:
Autosizing using the simulation program. It can be heavily influenced by 
1) Load time averaging window
2) DesignDay
both which are not normed by the standard.

The other issue for the PRM is chiller performance maps for the baseline equipment. As the ECB method requires the same equipment, applying an efficiency degradation factor accross the entire performance map is easy (I hope). PLR stays the same where not perscribed, or is adjusted when perscribed by the standard.

But what is the right thing to do for the PRM? It may be a different type of chiller. I would recommend using the performance map and PLR of a typical chiller of that type and size to be found in the chiller data base. In fact this is what we have been doing, isn't it.




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