[Bldg-sim] OT fresh air

[Chris Jones]

This is a timely subject.  I have been working on 
some very large distribution warehouses.  The 
staff are never all in one place at one time 
except morning, breaks and the end off 
shift.  The local authorities are asking that 
ASHRAE 62.1 be followed - warehouses at 0.06 
cfm/sf.  A half million square foot warehouse 
ends up with a lot of out door air that needs to 
be conditioned, especially in summer to remove 
the latent load.  I went through the Handbook of 
Applications and the Industrial Ventilation 
reference manual but found no guidance that would 
allow the OA to be lower than that value.

When one considers that over 3/4 of that space is 
solid from floor to ceiling with the stacks of 
crates, boxes etc.  it seems a very large amount 
of outdoor air for the floor space that is no "solid".

Does anyone have experience with this sort of 
facility and reducing outdoor air levels below that 0.06 cfm/sf.


At 11:20 AM 04/03/2013, David Eldridge wrote:
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>boundary="_000_C3ACED7A6ED5C6408CC43B138390EB8633F9DE60CH1PRD0611MB408_"
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>You should check with the design team to see 
>what the governing codes are from the local 
>authorities. In terms of ASHRAE references, 2011 
>Handbook of Applications Chapter 8 or Standard 
>170 will take precedence over ASHRAE 62.1, since 
>the criteria in this case is for infection 
>control purposes which goes beyond the comfort 
>requirements in 62.1. There are a number of 
>other references that the design team might be 
>using. These might include the client’s own 
>design standards which may be even higher than the regulatory requirements.
>
>Regarding your prior post about the reheat – it 
>will be a significant quantity, this is 
>ttypical. However for reheat to be higher than 
>the cooling end-use during a peak summer month 
>should be reviewed. Assuming your location has 
>economizer hours in the winter, the reheat could 
>easily be higher than the cooling on an annual 
>basis unless the design is including measures to reduce the need for reheat.
>
>David
>
> 
>
>
>David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
>Grumman/Butkus Associates
> 
>
>
>
>From: bldg-sim-bounces at lists.onebuilding.org 
>[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sambhav Tiwari
>Sent: Monday, March 04, 2013 3:52 AM
>To: bldg-sim
>Subject: [Bldg-sim] OT fresh air
>
>Hi All,
>          Is there any ACPH  recommende value 
> for operation theatre given in ASHRAE 
> 62  standards It is 100% fresh air AHU . but 
> the cfm sized  is very high 6cfm/sqft as per 
> design and if i reduce it to 3cfm/sqft i am 
> still not getting any discomfort hour.
>
>Thanks
>Sambhav.
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 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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