[Bldg-sim] Hybrid System - Definition?

[Arvinder Dang]

If this is for LEED Energy modeling baseline selection there are a few CIRs that allow you to model  some types of Hybrid systems with an electric baseline if the gas heat source is not predominant.
For example if the OA unit is as heating and everything else is perimeter electric heating, the OA can be treated as preheat gas as long as it is consistent in both baseline and proposed design.

ARVINDER DANG, LEED® AP
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Will Mak
Sent: Thursday, June 09, 2011 1:57 PM
To: Hall, Brendan; Chris; BldgSim Mailing List
Subject: Re: [Bldg-sim] Hybrid System - Definition?

That's how we've interpreted it also. Pretty much if it's not completely electric heat, it's hybrid (in terms of ASRHAE 90.1 App G)

William Mak, LEED AP BD+C
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Hall, Brendan
Sent: Thursday, June 09, 2011 1:47 PM
To: Chris; BldgSim Mailing List
Subject: Re: [Bldg-sim] Hybrid System - Definition?

I've tried to find a specific definition before with not a whole lot of luck. We've taken it as pretty much anything at is not purely sourced from the electrical grid. The example that I always run into is primary heating using a heat pump with a natural gas fired boiler as backup/supplemental heat. So it would be an electric/fossil hybrid. If anyone comes across an official definition I would be interested in seeing it.

Brendan Hall, M.Sc.
Mechanical Engineer

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris
Sent: Thursday, June 09, 2011 2:26 PM
To: BldgSim Mailing List
Subject: [Bldg-sim] Hybrid System - Definition?

Trying to track down the definition of a hybrid system according to ashrae.
Does anyone know where that definition can be found?
Cheers.

--
Chris Flood BSc (Eng)
Senior Building Analyst
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