[Equest-users] ground-source heat pump with gas backup

[Carol Gardner]

Doesn't PVVT allow you to have supplemental gas heat for the backup? Using a
furnace?  I think I just did that. You may be able to create a schedule for
it. I don't know about PVAV but you might be able to call it PVVT with out
too much trouble.
Try it and let us know. If it doesn't work do what Bill says to do.
Carol

On Tue, May 18, 2010 at 7:18 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

>  Demba,
>
>
>
> Here are two options that come to mind:
>
> 1.)     Add an electric HP-SUPP-SOURCE. Convert the electric use to gas
> (by hand calculation, not within eQUEST) and use the furnace AFUE to account
> for inefficiency.
>
> 2.)     Add baseboard heating of type FURNACE. Use OA TEMP control, create
> a RESET-RATIO baseboard schedule and adjust the OA temperatures to minimize
> daytime operation of the baseboards. You will need to create an hourly
> report to see when the baseboards (furnaces) are coming on.
>
>
>
> Regards,
>
> Bill
>
>
>
> *William Bishop, EIT, BEMP, LEED® 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
>
> P May is National Bike Month. Bike to Work Day May 21st.
>   ------------------------------
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Demba Ndiaye
> *Sent:* Tuesday, May 18, 2010 8:29 AM
> *To:* Carol Gardner; equest-users at lists.onebuilding.org
>
> *Subject:* Re: [Equest-users] ground-source heat pump with gas backup
>
>
>
> Carol,
>
>
>
> The building is a school. Operating hours are basically 7am - 4pm. The
> furnace operates as a backup only during the day, but at night is the only
> one operating to maintain heating setback.
>
>
>
> I have two system types: one is a PVAV and one, a PVVT.
>
>
>
> I can shut down the pumps through a schedule for night-cycling, but cannot
> see how to get only a furnace operating for night-cycling.
>
>
>
> Demba.
>
>
>
> *From:* Carol Gardner [mailto:cmg750 at gmail.com]
> *Sent:* Monday, May 17, 2010 8:21 PM
> *To:* Demba Ndiaye
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] ground-source heat pump with gas backup
>
>
>
> Hi Demba,
>
> What is the building type and operating schedule? Why the gas furnace as
> back up to cycle on only at night?
>
> Carol
>
> On Tue, May 18, 2010 at 12:21 AM, Demba Ndiaye <Demba.Ndiaye at setty.com>
> wrote:
>
> Folks,
>
>
>
> I have a ground-source heat pump that operates during the day. At night,
> the pumps are shut off, and if the space needs heating to maintain the
> setback temperature, a gas furnace kicks off.
>
>
>
> Said otherwise, only the furnace operates to maintain setback.
>
>
>
> How would you model that?
>
>
>
> _______________
>
> Demba NDIAYE
>
>
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>
>
>
> --
> Carol Gardner PE
>



-- 
Carol Gardner PE
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