[Equest-users] Heat pump Water heater

[Anthony Hardman]

To foot stomp the condenser note; the default performance curves seem to be extremely conservative compared to equipment available today.

Anthony Hardman, PE, LEED AP BD+C
Senior Building Performance Analyst, Owner

The Green Engineer | Sustainable Design Consulting
D: 978.341.5459  |  O: 978.369.8978
E: anthony at greenengineer.com<mailto:anthony at greenengineer.com>

From: Brian Fountain [mailto:Brian.Fountain at sa-footprint.com]
Sent: Tuesday, May 25, 2021 1:39 PM
To: John Aulbach <jra_sac at yahoo.com>
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Heat pump Water heater

Yes and yes.

There is indeed a heat pump type DHW heater in eQUEST.  Note that this is an air source heater with the condenser outside.  As such, the COP diminishes quite a bit from the rated value in colder climates.

If instead you have a water source heat pump with a relatively stable condenser temperature and COP, I tend to model with an electric DHW heater with an EIR of 1/COP.

Brian

Footprint

From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of John Aulbach via Equest-users
Sent: Tuesday, May 25, 2021 1:00 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Heat pump Water heater

CAUTION: EXTERNAL SENDER
Is there such an animal in eQuest or is there a workaround?

Thanks in advance.

John R. Aulbach, PE
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