[Equest-users] DOAS and Fan Coils
Erik Kolderup
erik at kolderupconsulting.com
Fri Jan 17 08:42:57 PST 2020
Noticed in your .inp file that you have a CHW design temperature of 14F.
Maybe that's the problem? Try something like 44F.
-Erik
*Erik Kolderup, PE, LEED AP*
erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com
On Fri, Jan 17, 2020 at 8:21 AM Matthew S. Garlick via Equest-users <
equest-users at lists.onebuilding.org> wrote:
> Thanks for the responses! Unfortunately adding design days didn’t help. I
> still get the following errors:
>
>
>
> With just four pipe fan coil system:
>
>
> ***WARNING***********************************************************************
>
> * DOAS System: ERV-1 does not serve
> any*
>
> * any systems (or zones), and will not be simulated.*
>
>
>
> ***WARNING**********************************************************************
> **(This x50)*
>
> * PredictX parabolic solution failed. Please*
>
> * send this input and weather file to program developers
> 3015*
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HSouth Perim Zn (T.S40) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HWSW Perim Zn (G.WSW5) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Fatal HVAC simulation errors.*
>
>
>
>
>
> With the DOAS serving the fan coil system (No heat recovery) and
> delivering OA to conditioned zones:
>
>
> ****NOTE*************************************************************************
>
> * Convergence issues in Design-Day mode 14*
>
> * Hours Slow: 8; Hours Failed: 0*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HWest Perim Zn (M.W10) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HEast Perim Zn (M.E12) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Fatal HVAC simulation errors.*
>
>
>
>
>
> With the DOAS and heat recovery serving the fan coil system:
>
>
> ****NOTE*************************************************************************
>
> * Convergence issues in Design-Day mode 14*
>
> * Hours Slow: 7; Hours Failed: 138*
>
>
>
> ***WARNING**********************************************************************
> **(this x50)*
>
> * PredictX parabolic solution failed. Please*
>
> * send this input and weather file to program developers
> 3015*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HSouth Perim Zn (M.S13) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HWSW Perim Zn (T.WSW41) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HNorth Perim Zn (G.N8) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HSouth Perim Zn (Mb.S22) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Fatal HVAC simulation errors.*
>
>
>
> I tried switching the weather file (This was a custom built file) and got
> the same errors so I don’t think the error lies there. I’ve attached the
> INP, PD2 (3.65 build 7175) and weather file for anyone with the time and
> desire to look into it.
>
>
>
> Thanks again for the help, you guys rock!
>
>
>
> [image: TBCx]
>
> *Matt Garlick, CxA, CEM, BEMP*
> Mobile: 801-907-5654
>
>
>
>
> *From:* Nicholas Caton <Nicholas.Caton at se.com>
> *Sent:* Thursday, January 16, 2020 9:19 PM
> *To:* Matthew S. Garlick <msg at tbcxinc.com>
> *Cc:* equest-users at lists.onebuilding.org; Jeff Hirsch <
> james.j.hirsch at gmail.com>
> *Subject:* RE: DOAS and Fan Coils
>
>
>
> Matt,
>
>
>
> Well-documented!
>
>
>
> It’s been somewhat established through a couple threads over the past few
> months that “convergence errors” can sometimes, if not always, be related
> to difficulties in the system sizing portion of the simulation, and in
> those scenarios may be resolved by providing DESIGN-DAY inputs and/or
> manually specifying coil capacities you are relying on eQuest to auto-size.
>
>
>
> You might check this possibility off the list by navigating to your first
> tab (Project & Site), deleting any design days you see there in the
> component tree, then importing the attached to see if that has any effect.
>
>
>
> I believe references to convergence in the errors can also sometimes be a
> red herring, but in this case I’m not seeing some related telltale
> language in those screen snips. If you do encounter something to the
> effect of “MsgBomb call argument: “ followed by some number of digits that
> is something you’ll want to document/share as well.
>
>
>
> ~Nick
>
>
>
> [image: cid:image005.png at 01D515A3.47EDD880]
>
> *Nick Caton, P.E., BEMP*
>
> Senior Energy Engineer
>
> Energy and Sustainability Services
> Energy Performance Contracting
>
> D
> M
> E
>
>
> 913 . 564 . 6361
>
> 785 . 410 . 3317
>
> *nicholas.caton at se.com <nicholas.caton at se.com>*
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
>
> [image: cid:image006.png at 01D515A3.47EDD880]
>
>
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Matthew S. Garlick via Equest-users
> *Sent:* Thursday, January 16, 2020 6:41 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] DOAS and Fan Coils
>
>
>
> Howdy,
>
>
>
> I’m trying to simulate a four pipe fan coil system with a DOAS ERV
> providing outdoor air in DOE 2.3 and getting some errors I haven’t been
> able to figure out, I’m hoping someone here knows the answer!
>
>
>
> The fan coil system runs by itself, connected to a campus CHW and steam
> loop, though I get the following error in my sim file:
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: L1West Perim Zn (G.W1) UA
> calculation*
>
> * failed to converge.*
>
>
>
> This seems to be a random zone and switches every time I run it. Besides
> defining OA flow at the zone, there are no other custom inputs at this time
> on the zone. When I add the DOAS (without the ERV) to the “OA From” field
> in the fan coil system, I get an aborted simulation and the following
> errors:
>
>
>
>
> ****NOTE*************************************************************************
>
> * Convergence issues in Design-Day mode 14*
>
> * Hours Slow: 3209; Hours Failed: 0*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HENE Perim Zn (M.ENE16) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HSouth Perim Zn (Mb.S22) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Fatal HVAC simulation errors.*
>
>
>
> Adding the ERV to the DOAS gets me a new set of errors:
>
>
>
>
> ****NOTE*************************************************************************
>
> * Convergence issues in Design-Day mode 14*
>
> * Hours Slow: 3384; Hours Failed: 1834*
>
>
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HNorth Perim Zn (M.N17) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ***WARNING***********************************************************************
>
> * PredictX parabolic solution failed. Please*
>
> * send this input and weather file to program developers
> 3015*
>
>
> ****ERROR************************************************************************
>
> * Heat-Exchanger: HEast Perim Zn (T.E39) UA
> calculation*
>
> * failed to converge.*
>
>
>
>
> ****ERROR************************************************************************
>
> * Fatal HVAC simulation errors.*
>
>
>
> Same notes and warnings as before but it adds the PredictX warning around
> 50 times (I edited the above).
>
>
>
> I tried stepping back to DOE 2.2 but of course you can’t define a DOAS in
> that engine and in 2.2 and 2.3 I’m unable to put an ERV on a fan coil
> system type.
>
>
>
> So then, can anyone shine a light on what’s going on?
>
>
>
>
>
> [image: TBCx]
>
> *Matt Garlick, CxA, CEM, BEMP*
> Building Efficiency Engineer | TBCx
>
> E-mail: msg at tbcxinc.com
> Mobile: 801-907-5654
> Direct: 801-401-9492
>
> 324 S. State Street, Suite 400
> Salt Lake City, UT 84111
> www.tbcxinc.com
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftbcxinc.com%2F&data=02%7C01%7CNicholas.Caton%40se.com%7C76063b4b33a54a126de208d79ae5fa2f%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C637148184845936058&sdata=rMYhO7OSmLsV9DMm%2BWLGmKuJkkjU2AmFLw9P%2BkloypU%3D&reserved=0>
>
>
>
>
>
>
>
>
>
>
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