[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
>>clientâs 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
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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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