[Equest-users] Modeling Air Source Heat Recovery Heat Pump Chillers

Sun Jul 10 06:59:09 PDT 2022

Hi Melissa,

I've come across this technology quite often in my designs but unfortunately I always end up relying on hourly data and excel calculations. I did not find a way to model it directly within eQUEST.

I'd be happy to know if there was a magic way I never heard of though.

[cid:image001.png at 01D89443.B2202380][cid:image008.png at 01D89443.B2159C30]

De : Equest-users <equest-users-bounces at lists.onebuilding.org> De la part de Melissa Crowe via Equest-users
Envoyé : 8 juillet 2022 17:45
À : equest-users at lists.onebuilding.org
Objet : [Equest-users] Modeling Air Source Heat Recovery Heat Pump Chillers

Hi All

Hope your summers are going well.

I am writing find out if you have seen/done energy models for buildings using modular air source heat recovery heat pump chillers. That is a heat pump that provides CHW and HW and uses air as the sink or source when the loads are not balanced.  This query is based on a specific technology that I believe is currently only manufactured by MultiStack,  It is a modular unit called ARA.

Given the current drive for electrification we are beginning to see multiple projects considering variations of designs for simultaneous heating and cooling where cooing is not necessarily the driving load, and the air source HP can now operate down to 0°F OAT.

The way I understand it is that eQuest defined equipment for this "Electric Heat Recovery Chillers" with air cooled condensers only uses air to reject heat not as a source. So, when heating mode is the load driver it can only come from a boiler.

If you have seen models of this equipment, I am hoping that you provide me with insight as how it was done.

Thank you
Melissa Crowe, BEMP, LEED AP
Sr Mechanical/Energy Engineer
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