[Greenbuilding] PHPP Flow Rates

[John Salmen]

Maximum flow rate is generally the maximum of your supply and exhaust
requirements (based on occupancy, assumed volumes, leakage, etc.) As I
understand it PHPP however calculates this just as volume (interior building
volume) multiplied by .3 ACH (air changes/hour) multiplied by 1.3 (real
world factor?). So oversizing by 1.5 keeps it in the real world and ensures
adequate ventilation.

-----Original Message-----
From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Bob klahn
Sent: March-04-13 7:21 PM
To: Green Building
Subject: Re: [Greenbuilding] PHPP Flow Rates

Eli,
I can't answer your question directly.  I am dealing with a situation where
I'm pretty sure the ERV flow is low and am equally frustrated.  
However, I recall a recent posting by Joe Lstiburek saying that they
oversized ERV's by 150%.

Given what my memory has done to me lately, you might want to find that
posting  for the rest of the story.  Check the BSC site.

I hope the lead helps.  This thread should be interesting.
Bob
On 3/4/2013 4:38 PM, Eli Talking wrote:
> I am trying to make sense of Ultimate Air spreadsheet describing how 
> to size ERV flow rates.  It references the Ventilation maximum flow 
> rate as determined from PHPP.
>
> Does anybody know how to find Ventilation maximum flow rate  PHPP?
>
> Eli
>
>
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