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

[Brian Fountain]

  On the energy design resources website (www.energydesignresources.com) 
there is a design guideline called "HVAC Simulation Guidelines" which 
includes a section on "energy efficient chillers" and has a procedure 
for developing custom chiller curves for DOE-2 -- including a table to 
send to the manufacturer to get the required information.

There is also the CoolTools spreadsheet tool which also generates the 
DOE-2 curve coefficients -- but I haven't played with it much so will 
let others comment on its use/applicability to screw compressors.

On 8/18/2010 1:26 PM, Mohammad Almasri wrote:
> 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 <mailto: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>
>     [mailto: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
>     <mailto: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 <mailto: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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-- 
Brian Fountain, Principal
GreenSim

voice - 519-489-0112
email - bfountain at greensim.com

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