[Equest-users] eQuest - FCU with DOAS

[Jonathan Curtin]

All,

I believe it is the RA temperature of the Dummy Zone that is passed to
the units with OA-From specified, so you are right John that the RA
would be too cold to return to an ERV, assuming your dummy space is
something around 55F.

I have spent many a late night trying to work around this problem and
can recommend the following approaches:
1. Model any Energy Recovery as an exceptional calculation (in a
separate model) for LEED
2. Incorporate the Energy Recovery into the FCUs or AHUs (although you
have to be really careful to properly account for your fan energy and
flow rates).

Regards,

  Jonathan M. Curtin, EIT, LEED(r) AP
  Mechanical Engineer

  

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [
mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Grando,
John
Sent: Monday, March 01, 2010 03:08 PM
To: James Hansen; Marcus Eliason; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] eQuest - FCU with DOAS


One further question that has been bothering me.  How would you set up
ERV with the DOAS?  I've seen some posts from the archives but none are
too clear.  The return air temperature of the DOAS appears to be too low
to use an ERV on. Any suggestions?


John Grando LEED AP


-----Original Message-----
From: James Hansen [mailto:JHANSEN at ghtltd.com]
Sent: Monday, March 01, 2010 11:16 AM
To: Marcus Eliason; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] eQuest - FCU with DOAS

I haven't had a chance to look at your .inp file, but when you are
creating a DOAS system, make sure that you at least do the following:

1) Make sure the fan schedule is forced off at night and setback times.
2) Make sure the throttling range for the dummy zone thermostat is at
least 4 degrees (I usually use 6).
3) Make sure that the heating/cooling schedules that the dummy zone
follows are set to something like 120 degrees cooling and 20 degrees
heating after hours, just to make sure that a call for heating/cooling
doesn't show up in your report, and mess up the unmet load hours.


Just looked at your file:  you need to specify some sort of minimum OA
control or minimum air schedule for the FCUs (I think).  Right now
nothing shows up.

Also, why is the DOAS system serving so many "dummy" zones?  I *think*
your DOAS system is EL1 Sys1 (SZRH), yet it is serving 20+ zones.  I'm
confused...

GHT Limited
James Hansen, PE, LEED AP
Senior Associate
1010 N. Glebe Rd, Suite 200
Arlington, VA  22201-4749
703-338-5754 (Cell)
703-243-1200 (Office)
703-276-1376 (Fax)
www.ghtltd.com



-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [
mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Marcus
Eliason
Sent: Monday, March 01, 2010 11:04 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest - FCU with DOAS


Hello,

I am trying to model a building with FCUs and a DOAS to deliver outdoor
air to the individual zones.  I have put in the dummy zones for the DOAS
system, modeled as a single air handler with chilled and hot water
coils. I have changed the walls of the dummy zone to air walls,
specified the DOAS to get OA flow as sum of all zones and for the FCUs
to get OA from the DOAS.  When I run the model, I get a lot of unmet
hours corresponding to the dummy zones and the DOAS system.  I have
tried but cannot seem to turn off the return air path for the DOAS
(since it is 100% OA) and have specified the minimum OA fraction for the
DOAS as 1.  I am not sure if the unmet hours means that my DOAS is not
adequately cooling the OA load or if it something else.
Also, my "pump & aux" energy in the model seems very high for a building
that only has 3 pumps.  Can someone familiar with modeling DOAS shed any
light on what might be causing some of these problems.  I have attached
the .inp and .pd2 files for reference.

Thanks,

Marcus Eliason



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