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

[Demba Ndiaye]

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<mailto: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
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