[Equest-users] DX Cooling Option

[Nick Caton]

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


[cid:489575314 at 22072009-0ABB]

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<mailto: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
[cid:489575314 at 22072009-0ABB]

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> [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<mailto: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<mailto:ehethcoat at lsapa.com>

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