[Equest-users] how to model steam absorption chiller in eQUEST

Sami, Vikram vikram.sami at zgf.com
Wed May 21 14:37:56 PDT 2014

It depends on what you are trying to do. If you want to attach to a local boiler then you don't need the steam meter.

Your original approach should work too - you just need to add a pump to the hot water loop. The steam meter is a surrogate for a boiler.

Vikram Sami
Associate Partner

T 206.521.3509 E vikram.sami at zgf.com
925 Fourth Avenue, Suite 2400
Seattle, WA 98104

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aaron
Sent: Tuesday, May 13, 2014 1:59 AM
To: John Aulbach
Cc: equest-users
Subject: Re: [Equest-users] how to model steam absorption chiller in eQUEST

Hi John
Thanks for you swift and useful help.
One more question,  steam meter is not neccessary to add to the steam loop, is it?
 Thank you

                   Aaron Zhou

------------------ Original ------------------
From:  "John Aulbach";<jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>;
Date:  Mon, May 12, 2014 11:46 AM
To:  "Aaron"<565520032 at qq.com<mailto:565520032 at qq.com>>; "equest-users"<equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>;
Subject:  Re: [Equest-users] how to model steam absorption chiller in eQUEST


Size the pump for the btus the chiller will require in hot water load, then set the pump kW to Zero. Pump will still work ,just not use any energy. You will need a steam boiler connected to the chiller, with probably a 100% efficiency. In that way, you are essentially firing the chiller with steam.

John R. Aulbach, PE

From: Aaron <565520032 at qq.com<mailto:565520032 at qq.com>>
To: equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>
Sent: Sunday, May 11, 2014 8:33 PM
Subject: [Equest-users] how to model steam absorption chiller in eQUEST

Hi guys
     I'm modelling a steam absorption chiller, but seems not easy. I've set the chiller as below.  I set heating source as Hot water loop, because seems steam is not available for absorption chiller.
    [cid:image002.jpg at 01CF7502.3E3A0D50]

I set steam meter for steam source,
[cid:image004.jpg at 01CF7502.3E3A0D50]

but error appears after running the model saying absorption chiller must have a pump for absorption steam loop as below.
[cid:image005.jpg at 01CF7502.3E3A0D50]
please, could anyone give some guide on this problem for me?



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