[Equest-users] auxilliary heat and desiccant wheel

[Nick Caton]

The photos are a little blurry, but it looks like you have 5 of  your
zones each getting a "system 2" and the rest are getting a "system 1."
Can't tell which is which from these screenshots...  Before proceeding
far past the wizards, I'd suggest re-considering following what I first
suggested:  Don't define a separate system for your DOA system in the
wizards - you'll account for it in the detailed mode.

 

Also ask yourself whether the quantity of systems matches what you're
expecting - effectively a separate heat pump furnace for each perimeter
zone, and one large one for the core.  That may be exactly what you're
intending, but only you know what you want to model.

 

That said, take a moment to double click the systems in that component
tree in your last screenshot.  That's where the tabs I'm  talking about
are found.  Heat recovery, gas preheat, defrost properties and so on are
items you define at the system level.

 

~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: Alan Crittendon [mailto:alanc at dwcei.com] 
Sent: Friday, November 05, 2010 4:02 PM
To: equest-users at lists.onebuilding.org
Cc: Nick Caton
Subject: RE: [Equest-users] auxilliary heat and desiccant wheel

 

Thanks that is very helpful.  However, I think I have something
fundamentally wrong with the HVAC.  I have two airside system types.
One is the packaged hvac heat pump and one is the unit I am going to use
as the fresh air erv.  I have them both assigned to the same shell
component under the first screen shown below.

 

  

 

When I try to do what you say below and modify the systems under detail
mode, I see this.

 

 

 

  Where am I supposed to modify the heat recovery?  Under each zone?

 

Alan Crittendon, PE, LEED AP
DW Collier Engineering, Inc.

(p) 731-479-2115

________________________________

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Friday, November 05, 2010 2:05 PM
To: alanc at dwcei.com; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] auxilliary heat and desiccant wheel

 

Hi Alan!

 

1.       "auxilliary strip heat:" Not totally sure what specifically
you're talking about (vocabulary disconnect probably), but I think
you'll find what you're looking for under the "supplemental heat/defrost
tab" in detailed mode.

2.       Look in the same place first... alternatively you may be able
to specify dual fuel as a pre-heat option

3.       Easiest approach, for projects large and small, generally is
to:

a.       Go to the airside system(s) served by the OA unit, 

b.      Enable/define energy recovery inputs (including wheel
properties), and 

c.       Proportion out the delivered flow rates and fan/process
energies of your OA unit between the served systems

 

~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 Alan
Crittendon
Sent: Friday, November 05, 2010 9:46 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] auxilliary heat and desiccant wheel

 

 

How do I factory in the auxilliary strip heat or use a dual fuel heat
option for packaged heat pumps?  Also how do I put in a desiccant wheel
for an outside air unit?

 

Alan Crittendon, PE, LEED AP
DW Collier Engineering, Inc.

720 Broadway St.

Suite 100

South Fulton, TN 38257
(p) 731-479-2115
(f) 731-479-8018 

 

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