[Equest-users] Heat Recovery Chiller

[Brian Fountain]

I can think of options but none of them are stellar:

1) make your reheat loop a separate primary loop -- this is good in that 
you can model heat recovery more closely.  The temperature in this 
reheat loop will typically be lower allowing for good pick up from the 
chiller condenser.  However, you will now have to split your boilers 
onto the two loops and create a part load curve for them that you feel 
correctly reflects the gas input at varying loads (non-trivial).

2) Artificially drop the temperature of your steam primary loop to get 
more heat recovery from the chillers.  You will have to watch your pump 
flows but, unless you are modelling pipe losses the impact should be 
small I think.


On 09/02/2016 10:55 AM, Bikesh Dahal wrote:
>
> Unfortunately it is. So, how is this normally done. Use excel 
> spreadsheet to calculate savings? Or is there a work around to it.
>
> *From:*Brian Fountain [mailto:bfountain at greensim.com]
> *Sent:* Tuesday, February 09, 2016 10:47 AM
> *To:* Bikesh Dahal; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Heat Recovery Chiller
>
> Heat recovery from chillers is a little tricky in eQUEST.  In order to 
> recover heat, the condenser loop supply temperature must be higher 
> than the heating loop return temperature.  Doing that typically 
> increases the lift on the chiller increasing the electrical input energy.
>
> You stated you couldn't recover to your reheat loop -- is it a 
> secondary loop?  Unfortunately no primary equipment can be attached to 
> secondary loops.
>
> On 09/02/2016 10:39 AM, Bikesh Dahal wrote:
>
>     Hi Everyone,
>
>     I am working on a project where I have a heat recovery chiller
>     that is recovering heat from IT room units in a hospital and then
>     providing heat to VAV reheat systems for other spaces. I am trying
>     to model this in equest and not getting the desired result.
>
>     eQuest is not letting me connect to reheat loop. And when I
>     connect it to my steam loop, I see no heating savings whereas I
>     see increased cooling use.
>
>     Anyone has any ideas on how to model this properly?
>
>     *Bikesh Dahal, BEMP*
>
>     *Associate*
>
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