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

Mohammad Almasri malmasri at ems-int.com
Thu Aug 19 00:07:27 PDT 2010


Many thanks for your help.

I just sent my request to York . But I hope if anyone have those curves fit
to send it to me for time saving. The chiller that I have is air cooled
screw "variable speed", and the full load capacity is 340 Ton .

 

  

 

Mohammad Al-Masri

Simulation Engineer 

LEED AP BD+C, CAPM

 

 

From: Brian Fountain [mailto:bfountain at greensim.com] 
Sent: Wednesday, August 18, 2010 8:46 PM
To: equest-users at lists.onebuilding.org; malmasri at ems-int.com
Subject: [!! SPAM] Re: [Equest-users] Modeling Variable Speed Air Cooled
Screw Chillers

 

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>
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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