[Bldg-sim] Process Loads
Patrick J. O'Leary, Jr.
poleary1969 at gmail.com
Fri Mar 18 14:28:26 PDT 2011
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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>
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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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