[BLDG-SIM] Lab system in ECB & LEED

[Dennis Lee Gmail]

Your lab exhaust is PROCESS load, LEED EAc1 will not compare energy
saving from the process, but only compare the saving from HVAC system
for humam comfort, i.e. only for office and classroom.

Depends how your ventilation system was designed, the heating/cooling
loads should be seperated for human comfort and process. I did a
similar case for a trade college building.

Few questions need to be answered anyway:
1. is the lab exhaust operating constantly, or ON/OFF switch available
on each station so that VAV exhaust is considerable (mine is VAV
exhaust)
2. Can you seperate ventilation system for human comfort and make-up
air for lab exhaust
3. Is there heat recovery system possible for AHUs
4. Did you check ASHRAE 90.1-2004, which regulates heating/cooling
load for make-up air for process exhaust, included kitchen hood
exhaust, this will help you set up your reference building.

Hope it helps

Dennis Lee


On 6/8/06, Peter Simmonds <peter.simmonds at ibece.net> wrote:
>
>
>
>
> The first response would be to drop LEED.
>
>
>
> The second would be to suggest that you VAV lab exhaust to reduce energy,
> you get an extra point for ventilating in excess of 62.1 recommended minimum
> requirements. Classrooms will also 100% OA. The lab supply air will be
> higher than 90.1 or 62.1 recommends, use the real world cfm as a constant
> volume system to determine the standard case then use the VAV fume hood
> control to reduce the energy consumption compared to the adapted standard
> case.
>
>
>
>
> Peter Simmonds Ph.D.
>
> Associate
>  IBE Consulting Engineers
>
> 14130 Riverside Drive Suite 201
>
> Sherman Oaks, CA 91423
>  p:   (818) 377-8220
>  f:    (818) 377-8230
>  m:  (818) 219-1284
>  IDEAS FOR THE BUILT ENVIRONMENT
>
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> From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of Eric Yang
>  Sent: Thursday, June 08, 2006 7:34 AM
>  To: BLDG-SIM at GARD.COM
>  Subject: [BLDG-SIM] Lab system in ECB & LEED
>
>
>
> Greetings
>
>
>
> We have a project going for LEED certification EA1.  The building has 20%
> classroom space, 20% office space and 60% chemical lab space.  The system
> has 100% OA because of the lab system.
>
>
>
> According to the ASHRAE 90.1 user guide, the minimum ventilation rates
> designed for the proposed building must also be modeled in the budget
> building design. Ventilation is energy neutral as far as trade-offs are
> concerned.
>
>
>
> Since the heating and cooling load between proposed and budget building is
> different, the calculated air flow of budget design is larger than the
> proposed design. It means the outside air is also larger than the proposed
> design.  My question here is how to have the same minimum ventilation rates
> and keep it "energy neutral"?
>
>
>
> This question is more about the LEED certification and if anyone has any
> suggestions and recommendations, please let me know.
>
>
>
> Many thanks.
>
>
>
> Eric
>
>
>
>
>
> Eric Yang, LEED AP
>
> Mechanical Engineer
>
> SmithGroup
>
> 1850 K Street, NW, Suite 250
>
> Washington, DC 20006
>
> t  202.974.4555 (direct)
>
> f. 202.974.4500
>
> eric.yang at smithgroup.com
>
> www.smithgroup.com
>
>
>
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