[Equest-users] End results analysis

[Nick Caton]

I think Pasha's suggestions to carefully review the schedules sounds
right - the plant equipment (capacity/pumps behavior) is clearly not
adjusting to the halved loads.  Be sure all such fields are allowed to
auto-size by not inputting too many sizing figures.

 

Carol, my immediate guess is that Samhav may be either trying to
evaluate a factory/industrial space which is being re-occupied for
another purpose (not a LEED comparision), or is otherwise simply trying
to prod/test his models' behavior to figure something else out or QC.
I've done a few factory-space retrofit designs (MEP) - it can be a whole
lot cheaper than building an entirely new factory ;) - it's also
prime-target work for claiming impressive LPD-based EPAcT tax
deductions... relatively easy to hit a home-run there for industrial
occupancies with regard to the interim lighting rule.

 

~Nick

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol
Gardner
Sent: Wednesday, July 21, 2010 11:57 AM
To: Pasha Korber-Gonzalez
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] End results analysis

 

Hi Sambhav,

I agree with Pasha's answer. When I read your email I was surprised that
you have a reduction in occupancy between your base and proposed case. I
don't think that's allowed, at least not by LEED, and I doubt by anyone
else. What is the reason for that reduction?

Carol

On Wed, Jul 21, 2010 at 7:03 AM, Pasha Korber-Gonzalez <
pasha.pkconsulting at gmail.com> wrote:

Hi Sambhav,

 

My first guess on this issue is that is has something to do with the
controls that you've specified for the chilled water loop (i.e. load
reset, or OA reset, etc.)  Apparently you are seeing that your fans are
the ones trying to satisfy the "call for cooling."   But the bigger
question is what are the cooling or chiller schedules that you have
input for your plant systems vs. your air-side systems.

 

My next guess is that with such a dramatic difference in fans, but not
in cooling energy is that in one of the models you probably have a large
number of hours of cooling not met (throttling hours out of range.)
Have you checked your BEPS/U reports, SS-F, SS-R?   Did you input your
own schedules or did you use the default operation schedules from the
program?

 

As is always the case for simulation questions when you ask "what's
going on?" the basic response is, "IT DEPENDS..."  on so many variables
that at this point you are the only one who knows which variables in
your model you have (or have not) adjusted.  

 

Best way for us to try and offer insight or solutions is to upload your
.pd2, .inp, and maybe even your weather file for us to run and look
deeper into your model file for you. 

On Wed, Jul 21, 2010 at 12:49 AM, sambhav tiwari <
tiwari.sambhav at gmail.com> wrote:

Hi All,
         In on of my projects i was geeting the energy end results
for two cases

                                 Cooling                     Fan
                 Pump

1 Proposed Case        3627607                   26,226,040
 59,369

2 Proposed Case2     3627295                    12141210
59,369


This is a fctory hall of 72000sqft served by 2 air cooled screw chiller
of 180TR

The difference in two cases is that in first case  Proposed Case1 the
EPD was 38w/sqft and occupancy was 220 ,and in Proposed case2  EPD
was changed to 11w/sqft and Occupancy to 100, my doubt is that with
such a large variation in EPD and Occupancy why there is neligiable
variation in cooling energy0.008% and zero variation in pump energy as
shown in above results although this is large variation in fan energy.

I was expecting that the energy in three of them  Cooling Fan and Pump
should have come down drasticaly it happened with fan but not with
cooling and pump.

Can anyone suggest some logic to this.

Thanks
Sambhav Tiwari
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-- 
Carol Gardner PE

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