[Equest-users] Heat pump with furnace backup

[Carol Gardner]

Thanks, Bill! Two good options to try.

Carol

On Fri, Feb 19, 2010 at 5:05 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

> Carol,
>
> You can select furnace as a baseboard heating source. (I've done this to
> represent gas-fired radiant heaters that share a space with a MAU.) You
> could set the BASEBOARD-CTRL to outdoor reset and use a schedule that
> matches the OA temperature at which the heat pump shuts off (if that's
> the case). Using this option, maybe you could select a supplemental heat
> source but set it to zero capacity, allowing you to specify the MIN-HP-T
> at which the heat pump shuts off. Using furnace baseboards, I wonder
> what the HIR is, though, since there is no place to enter it for
> baseboards.
>
> You could also select "electric" for the supplemental heat source, put
> it on a different meter, and convert the energy to therms afterward
> using the efficiency of the supplemental furnace.
>
> Regards,
> Bill
>
> William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP
> Mechanical Engineer
>
> 134 South Fitzhugh Street
> Rochester, NY 14608
> T: (585) 325-6004 Ext. 114
> F: (585) 325-6005
>
> wbishop at pathfinder-ea.com
> www.pathfinder-ea.com
> Please strive to live sustainably.
>
> -----Original Message-----
> From: equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol
> Gardner
> Sent: Thursday, February 18, 2010 8:04 PM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Heat pump with furnace backup
>
> Has anyone ever had to model an air source heat pump using a gas furnace
>
> for supplemental heat? It is not valid to select furnace as a
> supplemental heat source, although eQUEST will still run if you do so,
> so I need a work-around to get accurate output. Any ideas?
> Thanks in advance,
> Carol
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