[Equest-users] Air-cooled, frictionless centrifugal chiller with free cooling option in eQUEST

[Philip Kennedy]

Tom that is for a water cooled unit and not applicable to an air cooled
condenserless model.

 

Jason in a previous position I ran the turbocor testing lab and built all
the compressor maps/ dll’s. I also wrote the original Smardt selection.

 

If the manufacture is providing both the chiller section and the remote
condenser section then they have the ability to provide the data for you. If
this is a third party condenser with unknown characteristics the model is
going to be harder to create. You might want to just model a stock packages
air cooled unit from their catalog and apply heavy safety factors.

 

I would suggest making contact with the factory and have them provide
whatever runs you need, make an estimate of the saturation temperature loss
in the discharge and liquid line and bias the model appropriately to reflect
the loss.

 

If they want the sale and your model will influence the transaction they
should be open to assisting.

 

Regards Philip

 

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On
Behalf Of Tom Mickley
Sent: March-17-15 11:12 AM
To: Ng, Jason; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Air-cooled, frictionless centrifugal chiller
with free cooling option in eQUEST

 

This spreadsheet was sent to me last year from a Smardt rep for a 90 ton
Smardt chiller.  It may help.   

 

 

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On
Behalf Of Ng, Jason
Sent: Tuesday, March 17, 2015 10:24 AM
To: equest-users at lists.onebuilding.org
<mailto:equest-users at lists.onebuilding.org> 
Subject: [Equest-users] Air-cooled, frictionless centrifugal chiller with
free cooling option in eQUEST

 

Hello all, 

 

I am modelling a new construction in eQUEST that uses a fairly new chiller
product that I have not seen before. I was wondering if anyone has any
experience modelling this Equipment:

 

It is a Smardt remote air cooled chiller (the chiller is in the basement but
the condenser is on the roof 4 floors up). It uses frictionless magnetic
bearings, it has 2 compressors and it has an option for water side free
cooling which I can't seem to find any documentation on how it works
exactly. 

 

In eQUEST, I know that I cannot combine an air cooled chiller with the water
side economizer option since I need a condenser loop for the water side
economizer and I don't think eQUEST has any built-in performance curves for
an air-cooled magnetic centrifugal chiller with 2 compressors. I don’t have
enough information from the equipment spec sheets to model my own curves
either.

 

Does anyone have any ideas of the best way to model this?

 

Thanks!

 

 

 


  

Jason Ng_ing. jr. M.Sc.A., LEED green associate

 <mailto:jng at bpa.ca> jng at bpa.ca   |   <http://www.bpa.ca> www.bpa.ca  |  t:
5143833747x2813

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