[Bldg-sim] Process Loads

[Patrick J. O'Leary, Jr.]

also note that if you're dealing with a small IT closet, or data room, 
90.1 applies to comfort cooling applications.  i.e. people comfort, not 
machinery comfort.  try getting a liebert unit per the efficiency 
requirements of 90.1 chapter 6.  probably won't happen.  if you're just 
dealing w/a small IT closet or small data room and it is served by a 
packaged dx system i've just put them in both the proposed and baseline 
since it constitutes a single thermal zone.

but as far as process loads go, i typically include it/data in process 
loads & haven't had that questioned yet.  it does, after all, add to the 
total process that reviewer's look for being 25% of the baseline 
building cost.

On 3/18/11 1:57 PM, Nick Caton wrote:
>
> Assuming we're talking about 90.1, the definition for process load 
> reads something like "loads that don't have anything to do with 
> HVAC..." so you could make the case that a small IT closet split DX 
> unit or thermostat-controlled exhaust fan is not a process load, and 
> therefore the HVAC must be modeled as a system.  Why would one _want_ 
> to do this?  You could demonstrate better performance with your 
> efficient (?) system.
>
> On the other hand, loads in small IT closest are commonly core zones 
> with 24/7 loads, and as a result any such system would be running 24/7 
> and/or on a consistent basis.  An offshoot is you could very simply 
> roll any A/C for such spaces into the room's W/SF, and there would 
> potentially be little difference in consumed energy modeled.  Why 
> would one _want_ to do this?  Objectively:  It's easy/fast.
>
> If those were the only two points of interest on the table, as your 
> reviewer I wouldn't care either way.
>
> That said, the two above paths result in a pretty different baseline 
> scenario:  On the one hand you end up with a baseline system against 
> which your proposed system may excel or underperform against in 
> handling the data/IT room's heat loads.  In the other case you have 
> zero direct conditioning of the loads in that space in either model, 
> which would have to propagate into adjacent spaces/systems via 
> partitions -- which is in most cases a step or two away from 
> reality.   Where one approach is "removed" from reality and the other 
> may objectively "reward/punish" the design decisions made to condition 
> that space, I think it's pretty clear which is the preferable judgment 
> from a reviewer's standpoint.
>
> Then again, I'm not your reviewer ;).
>
> ~Nick
>
> cid:489575314 at 22072009-0ABB**
>
> * *
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> Smith & Boucher Engineers
>
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> *From:* bldg-sim-bounces at lists.onebuilding.org 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Otto 
> Schwieterman
> *Sent:* Friday, March 18, 2011 3:24 PM
> *To:* Rob Hudson; bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Process Loads
>
> Rob,
>
> You can try but I really doubt if the reviewer will see it that way. I 
> always consider it its own HVAC system in the proposed model and lump 
> it in with the one system per floor HVAC system in the baseline model.
>
> I do not see much of a benefit for counting this as a process load, 
> maybe you can explain why you want to do this.
>
> Otto
>
> *From:* Rob Hudson [mailto:rdh4176 at gmail.com]
> *Sent:* Friday, March 18, 2011 3:23 PM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Process Loads
>
> I have a question about definition and correct interpretation.  If I 
> am modeling building that has a space with a data rack and its own 
> cooling system separate from the rest of the buildings systems, is the 
> cooling considered process energy because it is "required" to be there 
> similar to the data rack electrical energy?
>
> thanks in advanced,
>
> -- 
> Rob Hudson
>
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