[Bldg-sim] Process Loads

[Nick Caton]

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

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

www.smithboucher.com 

 

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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