[Equest-users] Modeling Variable Speed Air Cooled Screw Chillers

[Mohammad Almasri]

Dear Paul,
how I can get those data points to build the EIR-fPLR&DT curve? is it
available in the manuals and chillers data sheets? or I should ask it from
the suppliers directly?

Please advice,

Mohammad Al-Masri
Simulation Engineer
LEED AP BD+C, CAPM

On Tue, Aug 17, 2010 at 4:45 PM, Paul Riemer <Paul.Riemer at dunhameng.com>wrote:

>  If you ask a manufacturer's rep how a chiller unloads at part load, the
> answer might be "good".  So I suggest you specifically request part load
> points at 10% intervals with and without AHRI condenser relief.  That should
> enable you to make or confirm both the EIR-fPLR&DBT and the EIR-fCHWT&DBT
> curves.
>
>
>
> If you want to go even deeper, you could ask for those part load points at
> different chilled water supply temperatures and then make or confirm a
> Cap-fCHWT&DBT curve.  That seems like overachieving to me, but my chilled
> water supply temperatures rarely deviate very far from AHRI standard
> conditions.
>
>
>
> Good luck,
>
>
>
> *Paul Riemer, PE, LEED AP*
>
> Associate / Mechanical
>
> Direct: 612-465-7696
>
>
>
> *DUNHAM*
> Celebrating 50 Years of Service
>
>
>
>
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Carol Gardner
> *Sent:* Tuesday, August 17, 2010 9:22 AM
> *To:* Mohammad Almasri
> *Cc:* eQUEST-users at onebuilding.org
> *Subject:* Re: [Equest-users] Modeling Variable Speed Air Cooled Screw
> Chillers
>
>
>
> Mohammad,
>
> You will need to ask the manufacturer for information on how the chiller
> unloads at part load so you can create an EIR-FPLR curve of your own. That
> shouldn't be too hard. It looks like there's no problem with having the
> water from the chillers flow using variable speed pumps so that part's there
> if you want it. Let me know if you need help creating a curve.
>
> Carol
>
> On Tue, Aug 17, 2010 at 1:54 AM, Mohammad Almasri <malmasri at ems-int.com>
> wrote:
>
> Hi all,
>
> How we can model a Variable Speed "Air Cooled" Screw Chillers in eQUEST?
> The
> available variable speed chillers curves in eQUEST are only for the
> centrifugal .
>
> Thanks,
>
> Mohammad Al-Masri
> Simulation Engineer
> LEED AP BD+C, CAPM
>
>
>
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>
>
> --
> Carol Gardner PE
>
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