[Equest-users] DCV

[Frederick Doherty]

Sambhav,
  
If the lab is served with 100% OA there will little to no difference 
between the OA CO2 and the space CO2 sensor readings - likley only 
sensor error.
  
CO2 sensing is not the way to modulate the amount of OA serving lab 
space.  If you wish to modulate the amount of OA delivered to the Lab I 
would recommend consulting an Industrial Hygienist who can best 
determine air-change rates etc. appropriate MUA and exhaust systems.

Best Regards, Fred
  
Frederick Doherty, PE, CEM, LEED-AP
  
Resource & Energy Consulting
PO Box 367 
North Andover, MA 01845-0367
  

------ Original Message ------
From: "sambhav tiwari" <tiwari.sambhav at gmail.com>
To: "equest-users" <equest-users at lists.onebuilding.org>
Sent: 6/9/2012 6:14:36 AM
Subject: [Equest-users] DCV
>Hi All,
>         How can i model DCV for a laboratory building with 100%
>fresh air ie no recirculation.
>
>Since there is no return air path here so HVAC consultant says that
>CO2 sensors will be placed in the occupied zones between 3 to 6ft, and
>fresh air ie supply air will be modulated based on CO2 ppm
>differential of outside and zone air.
>
>But if when i tried to do it by making OA control method as DCV zone
>sensors in OA and economizer tab in Air size system HVAC i am getting
>75% reduction in my cooling energy which is unimaginable.
>
>I look forward for any response.
>
>Thanks
>Sambhav.
>
>
>