[Bldg-sim] Hybrid System - Definition?

[Andrew Craig]

Chris---

 

Another hybrid system type common out here in the northwest is Packaged VAV with natural gas furnace preheat and electric zone reheat at the terminal units.  It has always been accepted as a hybrid system through many LEED reviews/certifications.

 

Regards,

 

Andrew Craig PE, LEED AP
Project Mechanical Engineer

INTERFACE ENGINEERING
email andrewc at interfaceeng.com <mailto:andrewc at interfaceeng.com> 
direct 503.382.2696

www.interfaceeng.com <http://www.interfaceeng.com/> 




 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Arvinder Dang
Sent: Friday, June 10, 2011 9:14 AM
To: Will Mak; Hall, Brendan; Chris; BldgSim Mailing List
Subject: Re: [Bldg-sim] Hybrid System - Definition?

 

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

SUSTAINABILITY SPECIALIST   

 

SKIDMORE, OWINGS & MERRILL LLP 

224 SOUTH MICHIGAN

CHICAGO, IL 60604 

T: 312.360.4633  F: 312.360.4910 

ARVINDER.DANG at SOM.COM <mailto:ARVINDER.DANG at SOM.COM> 

 

 

SOM

 

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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
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

Sustainability

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
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W: www.epsteinglobal.com <http://www.epsteinglobal.com/> 

þ Epstein is a firm believer in sustainability. We ask that you please consider the environment before printing this e-mail.

 

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

 

karpinski
ENGINEERING
3135 Euclid Avenue
Cleveland, OH  44115
P  216.391.3700

F  216.391.0108
E  bhall at karpinskieng.com
W www.karpinskieng.com <http://www.karpinskieng.com/> 

 

________________________________

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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