[Equest-users] DX Cooling Option

[Eric Hethcoat]

RE - The greyed out area - The system is a basic PSZ with gas heat/DX
cooling.  Equest defaults to DX for this system type and so the greyed
out issue is sort of non-relevant I've found.
 
The other space indicating no cooling on the SSA report I haven't
figured out yet.  I changed the space temperature settings and no
difference was made, when I went from 90 to 55.  I've already reviewed
the SSO reports to do the same you suggested.  I'll continue looking at
a few other items as well.
 
Thx

________________________________

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Friday, June 15, 2012 10:51 AM
To: Eric Hethcoat; equest-users at lists.onebuilding.org
Subject: RE: DX Cooling Option



Hi Eric,

 

Re-reading your posts, I'm now uncertain I understand the context of
your concerns... are you getting unmet cooling hours, or if not
how/where are you observing cooling "not occuring?"  When you say "if
any cooling shows," how/where are you making that observation?  

 

If the heart of your concerns is the greyed-out "n/a" input for cooling
option in the detailed edit windows, you'll find that input is only
applicable to certain system types on reading the associated help entry
- this can be a non-concern if conditioning is occurring.  

 

One means of confirming heating/cooling is occurring is to examine SS-O
report "space temperature summary," keeping in mind a correctly
operating system without unmet hours should float around and between
your heating/cooling setpoints.  In climates like ours (KS), if cooling
is not occurring at all you'll probably observe a majority of hours
above the 75-80 bin.  A more detailed means of observing space
temperature behavior is to generate an hourly report for the zone(s) in
question.

 

Another interpretation I have for your situation suggests pointing out
you can define more than one system type in the wizards, and assign to
zones accordingly using the zone allocation screens - you aren't
restricted to one system per shell or anything.

 

Hope something here hits the mark =)!

 

~Nick

 

 

 

 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 

From: Eric Hethcoat [mailto:EHethcoat at lsapa.com] 
Sent: Thursday, June 14, 2012 7:44 PM
To: Nick Caton; equest-users at lists.onebuilding.org
Subject: RE: DX Cooling Option

 

Checked all schedules first.  All are the same.

 

Went back into the Wizard.  It was selected as furnace with no cooling.
Changed to furnace with DX as a PSZ.  reran the file and again same
result.  I presume that if any cooling shows, then it is indeed modeling
it - correctly?  

 

The space with no cooling is identical in all but physical size to the
other spaces that do have a cooling load associated to them in the
simulation output.


Eric

 

________________________________

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Thursday, June 14, 2012 4:52 PM
To: Eric Hethcoat; equest-users at lists.onebuilding.org
Subject: RE: DX Cooling Option

Hi Eric,


First thought is if you chose "no cooling" in the wizards, the wizards
may have assigned a system type (there are many) which cannot be
assigned any cooling function no matter what you do.  You may need to
review and re-assign the system type as a result.


If this could be the case and you're still gaining familiarity, it can
be instructive to save a 'dummy' copy of your project, then go back to
wizards, re-create the system you're thinking of (with cooling), and
observe what the wizards generate as a result for edits in your 'actual'
project.

 

If the system is correctly defined, an easy miss might be defining
cooling thermostat inputs (scheduling) for the zones to be conditioned.

 

Best of luck!

 

~Nick



 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org [
mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Eric
Hethcoat
Sent: Thursday, June 14, 2012 4:17 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] DX Cooling Option

 

I've got a baseline and proposed model for a project set up.  I've been
thru every wizard mode input, then changed several items in the detailed
input mode.  Successful runs for both.  

 

The one thing that is not showing up on only a single zone for one
system between both models is cooling.  In the wizard mode - it is
entered as "no cooling".  I understand this limits what systems can be
chosen - in wizard mode.

 

In the detailed mode I've been thru every cooling tab to ensure all
cooling properties are correctly indicated as if we had DX - however
under the air-side system tab, the selection of chilled water or DX is
not available - and is greyed out to N/A.  I've played with zone temps,
schedules, etc. and none have any change in the result for cooling in
this area.

 

How can I ensure that I have the proper cooling?  I only have standard
gas fired heating/DX cooling PSZ equipment.  No heat pump.  

 

Eric Hethcoat, P.E.

Partner

Latimer, Sommers & Associates, P.A.

3639 SW Summerfield Dr., Suite A

Topeka, KS  66614

c.  913.481.3256

w.  785.233.3232

f.  785.233.0647

ehethcoat at lsapa.com

 

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