[Equest-users] No heating load to systems

[Pasha Korber-Gonzalez]

Hi Umesh,

thanks for your attention to my issue.  Unfortunately because this is a
baseline case I can only put in pre-heat if my proposed design has it, and
my case does not.  What I thought was interesting in my case was that the
preheat & baseboard inputs were showing heating energy consumption, but the
AHU & HW coil was not showing any heating energy---I have know learned that
because I didn't have the T-stat schedule input this was not offering the
"call for heating" that the AHU was looking for.

At some point when I switched my project from Wizard to DDedit mode (&
changed my HVAC system type from chosen in the Wiz) so I went through the
input spreadsheet and "reset" the inputs back to default since I had changed
from an initial FC system selected in the wizard.  I didn't realize that by
"re-setting" the t-stat schedules they didn't default to a common schedule,
they just defaulted to nothing---so nothing was what I got.

this is a great simulation community and resource where we can all support
and help each other learn and learn from others' trials & troubles.  keep
the communication flowing...

Pasha

On Wed, Mar 3, 2010 at 12:22 PM, Umesh Atre <umesh at innovativedesign.net>wrote:

>
> Pasha,
> I tried running your model as-is, and came up with a bunch of warnings re
> low preheat/heating capacities. I added preheat
> along with some humidity control for all the zones, and got the attached
> output.
> Maybe the program was just not doing the heating voluntarily, and had to be
> forced to.
> Hope this helps,
> Umesh
>
>
>
>  ------------------------------
>  *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Pasha
> Korber-Gonzalez
> *Sent:* Wednesday, March 03, 2010 1:05 PM
> *To:* James Hansen
>  *Cc:* eQUEST Users List
> *Subject:* Re: [Equest-users] No heating load to systems
>
>   Thanks James.   I do have an additional HW loop pump...but I will take a
> look at the thermostat schedule stuff.
>
> Pasha
>
> On Wed, Mar 3, 2010 at 11:01 AM, James Hansen <JHANSEN at ghtltd.com> wrote:
>
>>  You might need to add a hot water loop pump instead of just relying on a
>> boiler pump.  See if that affects your heating energy consumption.
>>
>>
>>
>> Also, your zones don’t appear to have any thermostat schedules configured.
>>
>>
>>
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>> **James Hansen**, PE, LEED AP*
>>
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>>
>> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Pasha
>> Korber-Gonzalez
>> *Sent:* Wednesday, March 03, 2010 12:45 PM
>> *To:* John Aulbach
>> *Cc:* eQUEST Users List
>> *Subject:* Re: [Equest-users] No heating load to systems
>>
>>
>>
>> Thanks John--I hadn't input the reheat delta t, thinking that it was one
>> of those "blank" default auto-calc things....  so by inputting a 30 deg
>> delta, that took away the error in the bdl file, but the results are still
>> not showing any space heating consumption and yet somehow I have 0.0 hours
>> out of throttling range---I thought this had to be too good to be true.
>>
>>
>>
>> I've attached the current .pd2 & .inp files I am running.  If you do have
>> time to take a quick peak at my inputs...this baseline file is  based on
>> Appendix G compliance.  please note my system names do not match the system
>> selection I have for baseline case.
>>
>>
>>
>> Thanks for your time and attention to give me a hand.
>>
>>
>>
>> Pasha
>>
>> On Wed, Mar 3, 2010 at 10:32 AM, John Aulbach <jra_sac at yahoo.com> wrote:
>>
>> Pasha:
>>
>>
>>
>> Have you specified your Reheat-Delta-T for your zone VAV boxes? Send the
>> .INP and .PD2 if you require further help.
>>
>>
>>
>>
>>
>> John R. Aulbach, PE, CEM
>>
>> Senior Energy Engineer
>>  ------------------------------
>>
>> *Partner** **Energy*
>>
>> 1990 E. Grand Avenue, El Segundo, CA 90245
>> W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
>>
>> www.ptrenergy.com | jaulbach at ptrenergy.com <%7C%20jaulbach at ptrenergy.com>
>>
>>
>>
>>
>>  ------------------------------
>>
>> *From:* Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com>
>> *To:* eQUEST Users List <equest-users at lists.onebuilding.org>
>> *Sent:* Wed, March 3, 2010 9:28:30 AM
>> *Subject:* [Equest-users] No heating load to systems
>>
>>
>>
>> Hi all,
>>
>>
>>
>> I thought I was wrapping up my baseline model and then for some reason I
>> discovered that the only heating energy being used is going through the zone
>> baseboards.  When I take out the baseboards, the results show a big fat ZERO
>> for any space heating energy the DOE2 error shows below.  How can the design
>> loads not get passed to the system.  The baseline systems are VAV with
>> reheat, but for some reason there is no heat or reheat unless I specify
>> pre-heat (which there is none) or baseboards...  any ideas are
>> appreciated--because I thought I was closer to finished with this model
>> until this issue popped up.
>>
>>
>>
>>
>> ***ERROR***********************************************************************
>>
>> Loop: Hot Water Loop has zero design flow.
>>
>> Check input for consistency, or specify design loads.
>>
>>
>>
>>
>>
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>>
>
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