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

[Paul Riemer]

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<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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