[Equest-users] ASHRAE 62.1 cfm/person

[Jim Marsh]

Good point.  One option is to use CO2 monitoring as an option to a minimum
OA flow rate, which results in lower OA flows. This is allowed in many
conditions in LEED and local building codes.


Jim Marsh, PE, LEED AP
SEG
2550 Walsh Avenue
Suite 120
Santa Clara, CA 95051
Desk: 408 260 8008 Ext 210
Cell: 408 656 3096
Fax: 408 260 8018
http://seg-corp.com/
 
 
This communication constitutes an electronic communication within the
meaning of the Electronic Communications Privacy Act, 18 USC 2510, and its
disclosure is strictly limited to the recipient intended by the sender of
this message.  This communication may contain confidential and privileged
material for the sole use of the intended recipient and receipt by anyone
other than the intended recipient does not constitute a loss of the
confidential or privileged nature of the communication.  Any review or
distribution by others is strictly prohibited.  If you are not the intended
recipient please contact the sender by return electronic mail and delete all
copies of this communication. 

P Please consider the environment before printing this email

 


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Glenn
Haynes
Sent: Tuesday, March 31, 2009 10:03 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] ASHRAE 62.1 cfm/person

What I am about to say may be controversial, but I am a conservation program
impact evaluator, an avid DOE2 user, and feel strongly about excessive OA
ventilation requirements, especially in colder climates.  The ASHRAE
minimum, when translated into air changes per hour (ACH) requires over 0.8
ACH for a 10x10 office with an 8 foot ceiling and one occupant.  On the
other hand, the EPA claims that Energy Star homes must have an energy
recovery ventilator because they often end up with natural infiltration
rates under the threshold of safety, about 0.32 ACH.

If, as they believe, 0.32 or higher is safe enough for residential
occupants, why, then, does the ASHRAE standard require almost three times
that for office spaces?  This high requirement is, of course, safe enough,
but it is costing commercial building operators in cold climates a fortune
in heating costs, often accounting for 50% to 80% of the total heating
energy consumption.  In hot climates it translates into excessive cooling
energy use.  Is it time for some of us to question the ASHRAE standard, or
is the EPA threshold (it isn't a law) safe enough?

With the current emphasis on LEEDS design are we overlooking a huge energy
savings potential here?  We strive very hard to save as much energy as
possible, but then we are required to impose a questionable ventilation
standard that often overshadows all else.

I just want to hear some other professional thoughts on this.

Glenn C. Haynes, PE
Middletown, CT

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Min-Hwan
Yang
Sent: Tuesday, March 31, 2009 12:08 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] ASHRAE 62.1 cfm/person

I think what Pravin did was correct.

Eric, according to DOE2.2 Dictionary, only the maximum value of oa-flow/area
and oa-flow/per will be used, not summed together.  
Please let me know if I am wrong.

Min-Hwan Yang, CPD, LEED AP
Mechanical Engineer | yangm at kjww.com

200 West Jackson Boulevard, Suite 1200 | Chicago, Illinois 60606
312-294-0501 | Direct: 312-356-3750 | Fax: 312-294-0003 www.kjww.com

Pravin,

I'm attaching a screen capture from a building I modeled (yes, that system
setup was heinous and produced terrible results - it wasn't my doing) that
shows the OA settings based on 62.1 requirements. 

Let me know if that doesn't simplify your process.

Eric

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pravin
Wakode
Sent: Tuesday, March 31, 2009 4:50 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] ASHRAE 62.1 cfm/person

Hi All,
        This query is related to HVAC Ventilation used in equest. As per
ASHRAE 62.1 Ventilation rates are specified based on per person and per sqft
basis for example if I consider a office area the ventilation rates would be
5 cfm/person + 0.06 cfm/sqft.
Equest doesnt allow you to enter the ventilation rate based on sqft basis.
I  am calculating the ventilation rate manully (using per-person + per-sqft
basis) and then dividing it by total occupancy and arriving at the
cfm/person value which is to be entered in Equest.
Is this procedure correct???
Regards,
Pravin Wakode

This message and any attachments contain information intended for a specific
party and may include sensitive or confidential material. If you are not the
intended recipient, please do not read, copy, use, or disclose to others.
Please notify the sender of the delivery error by reply and then permanently
delete this message and all attachments.
_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG