[Equest-users] Creating a Single Packaged DX Coil with Gas Furnace

Wed Mar 7 09:28:47 PST 2018

Hi Bill,

I managed to crack it a few hours ago as a packaged DX unit with furnace as
the heat source with ZONE HEAT SOURCE not installed.

I suspected the spec sheet provided was in error when they referred to hot
water coil plus I'm getting expected energy consumption more or less so must
be on the right track.

Thanks

Regards

DAMON LAPPING

Managing Consultant

 <mailto:damon at greenlogik.co.za> damon at greenlogik.co.za

 <http://www.greenlogik.co.za/about.html> www.greenlogik.co.za |
<http://www.pvsystem.co.za/> www.pvsystem.co.za

T.    +27 21 (0) 87 470 0650    F.   +27 (0) 86 763 1323

C.   +27 82 339 3865

UNIDO Certified Energy Management Professional 

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Professional 

From: Bishop, Bill <bbishop at pathfinder-ea.com> 
Sent: Wednesday, 07 March 2018 4:59 PM
To: Damon Lapping <damon at greenlogik.co.za>
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Creating a Single Packaged DX Coil with Gas
Furnace

Hi Damon,

Can you provide the Carrier product sheet for the unit? A packaged DX unit
will generally be natural gas-fired, though it could have a hot water coil.
It would be unusual to have both, but you could model it that way in a
single unit if needed. (You could model a gas-fired 'Furnace' preheat coil
along with a Hot Water Loop for the main SYSTEM:HEAT-SOURCE for example.)
But you say there is no HW loop, so why would it have a HW coil?

I suspect you should model this as a PSZ system ("Pkgd Single Zone", which
only comes with DX cooling) with FURNACE for HEAT-SOURCE. Your
ZONE-HEAT-SOURCE should be "Not Installed" unless you have a reheat coil.

Regards,

~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers &
Architects LLP

Senior Energy Engineer

134 South Fitzhugh Street                 Rochester, NY 14608

T: (585) 698-1956                        F: (585) 325-6005

 <mailto:wbishop at pathfinder-ea.com> bbishop at pathfinder-ea.com
<http://www.pathfinder-ea.com/> www.pathfinder-ea.com

Carbon Fee and Dividend - simple, effective, and market-based.

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On
Behalf Of Damon Lapping via Equest-users
Sent: Wednesday, March 07, 2018 2:14 AM
To: equest-users at lists.onebuilding.org
<mailto:equest-users at lists.onebuilding.org> 
Subject: [Equest-users] Creating a Single Packaged DX Coil with Gas Furnace

Good Day,

This may seem like a simplistic question as I'm new to eQUEST.

I am familiar with different cooling systems but not so much heating
systems.

I need to add in a combined single zone DX Coil package with natural gas
used for heating, from the specs I have I assume it's a furnace with a hot
water coil.

It's a carrier.

However in Equest there isn't a combined system so I added in two systems
one for the Single Zone DX Coil Cooling only then added in a separate entry
for the heating as a furnace with a hot water coil.

I ran the model but when going into the detailed model I don't see the hot
water coil, if I add it into the heating tab then I need to add a hot a
water loop and there is none.

I might be totally off the mark here but am battling with this section, any
assistance would be great.

Thanks

Regards

DAMON LAPPING

Managing Consultant

 <mailto:damon at greenlogik.co.za> damon at greenlogik.co.za

 <http://www.greenlogik.co.za/about.html> www.greenlogik.co.za |
<http://www.pvsystem.co.za/> www.pvsystem.co.za

T.    +27 21 (0) 87 470 0650    F.   +27 (0) 86 763 1323

C.   +27 82 339 3865

UNIDO Certified Energy Management Professional 

SA Green Building Council Existing Building Performance Accredited 

Professional 

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