I have a Liebert Computer Room Unit (DX System) it has a capacity of 137.8 MBH.
It has a low efficiency (8.2 EER), the min efficiency listed on the 90/1-2007 TABLE 6.8.1B is 10.6 EER.
These types of units are designed to cool and keep humity controlled, not to be efficient. Can I call it a Process Load?
Or do you think I need to model the Proposed Building with the 8.2 EER and the Baseline Building with the 10.6 EER??
The computer room runs 24/7.
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
962 thumbs up
July 19, 2010 - 8:50 pm
I don't think you can necessarily call it a process load, but you may be able to make the case that the type of unit being used is not covered by ASHRAE, and therefore your baseline should have a lower EER.
Are you sure you are comparing at the same operating conditions? I don't understand why the "Liebert" unit performs so poorly, and if it does, why you feel compelled to use it.