Fresh Air CFM, ASHRAE 62.2 ventilation rate

[@tirotkhumalo2688]

Thank you for your clear elaboration.

[@hvaceasymath]

Thank you! I am glad you liked it.

[@johndebarge2708]

Thanks for the video.

[@hasankarim7205]

Thank for good explanation

[@hvaceasymath]

Thanks for your kind words!

[@serverg79]

Great video! Good job! Keep it up!

[@hvaceasymath]

Thanks for your kind words!

[@hvaceasymath]

Thanks for your kind words!

[@reasmeingor1962]

Thank for your video. Could you teach how to calculate fresh air for fcu and ahu?

[@hvaceasymath]

Thanks for the comment! I will make a video about fresh air for the commercial field. ASHRAE 62.1

[@19boney]

Waiting for video based on commercial one

[@hvaceasymath]

ASHRAE for commercial is in the link: kzbin.info/www/bejne/hZfEpKJ_apaFh6c

[@sina1329]

so basically this is the old standard right

[@hvaceasymath]

Yes. It’s ASHRAE 62.2-2010. We still use this standard

[@mdakramhossen8954]

Pls tell me which is correct formula..... 1) 0.01 x sqft + 7.5 (Nbd + 1) OR 2) 0.03 x Sqft + 7.5 (Nbd + 1)

[@hvaceasymath]

No problem, we mostly use 1) 0.01 x sqft + 7.5 (Nbd + 1) ASHRAE 62.2_2010. The other Fórmula (2) 0.03 sqft + 7.5 (Nbd + 1) is based on ASHRAE_2013 which requires more exhaust cfm than formula 1. So the answer is formula 1 and in some especial cases formula 2

[@mdakramhossen8954]

@@hvaceasymath So which one do we use? I saw in ASHRAE 62.2 - 2010 PDF that they cut out formula 1 and used formula 2.

[@hvaceasymath]

We are using formula 1. I haven’t seen so far the implementation of formula 2. In some cases they might be implementing it for whole house ventilation. Below is a link for a good resource of formula 1. www.hvacquick.com/catalog_files/Aldes_ASHRAE_62.2_2010_Guide.pdf

[@mdakramhossen8954]

@@hvaceasymath Pls see this link- www.ashrae.org/File%20Library/Technical%20Resources/Standards%20and%20Guidelines/Standards%20Addenda/62_2_2010_addendum_r_Final.pdf