[Bldg-sim] OT fresh air

Martin Roy ing. LEED AP martin.roy at mra.qc.ca
Tue Mar 5 11:33:18 PST 2013


HI Chris,

I did design a refrigerated warehouse and did 
struggle with this (The warehouse was to be LEED 
certified and we had to meet ASHRAE 62.1)
The solution I found was to use the IAQ procedure 
in 62.1.  We calculate the contaminant, mosthly 
CO2 from people and arrive with a total cfm a lot 
smaller (20 cfm/person) than the ventilation rate procedure.

Imagine if we had to use 0.06 cfm/sqft, the 
refrigeration load would have been a lot higher.
After discussion with a lot of other refrigerated 
warehouse designer, the rarelly introduce fresh air.

Hope this help

Martin

At 12:23 05/03/2013, Chris Jones wrote:
>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:
>>Content-Language: en-US
>>Content-Type: multipart/alternative;
>> 
>>boundary="_000_C3ACED7A6ED5C6408CC43B138390EB8633F9DE60CH1PRD0611MB408_"
>>
>>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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>Bldg-sim mailing list
>http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
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----------

Martin Roy, ing. PA LEED®, président
Martin Roy et associés
1805 chemin Oka,
Deux-Montagnes, Qc
J7R 1N3


Tel: 450-623-0340
Cell. 514-594-6352

www.mra.qc.ca






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