commercial market alteration 1

[norske35]

any thoughts on determing a infiltration rate for a market 2 automatic sliding doors . one entrance , the other exit
i was looking a some data for estimating passages per occupant per hr and come ou .
its a one story building with roof hvac units.
if building pressure is positive how much can infiltration can be neglected

 

[DRWeig]

First, consult the ASHRAE handbooks.

Second, stick these phrases in Google:

infiltration guidelines hvac design

infiltration guidelines energy modeling

infiltration guidelines sliding doors

You'll find about 100 good references from ASHRAE, PNNL, NIST, MIT, NIBS, and others.

Best to you,

Goober Dave

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[norske35]

thanks
thats my point
i'm looking for someone with experience in the area , not 5 techical papers with an unlimited buget .in this economy its hard to turn jobs down. so, we take them an try to figure them out
cut to the chase on big picture
i have ashrae volumes 1-4

 

[317069]

DRWieg gave you the right solution for your homework.
Technical paper is the result of experience and studies.
for the economy side, if the infiltration load will cause a damage to business, then it is better to close this business and look for something else.

 

[EnergyProfessional]

ASHRAE Fundamentals has an infiltration chapter. There are 2 equations determining pressure based on wind speed and dT. Calculate both pressures, add them. If your building has positive pressure, subtract that from your calculated value. Then apply in that equation that gives you flow through a rectangle opening with your door dimensions. You can average that over an hour assuming the door is only open 20% of the time, only use 20% of that.

This may not really be accurate, but has some science to it. When I have time I research more on what DRWeig suggested. but the method i described should work for the load. it won't really work with energy simulation since that flow will be highest at the coldest day.

 

[norske35]

if a building is positively pressureized, can the door entrance door infiltration be neglected

 

[DRWeig]

Not if you have a receptionist 10 feet straight in front of the door. In the winter, you'll hear nothing but misery about cold feet. In your case, that may be the nearest sales clerk or the folks behind the checkout stand.

An air curtain can mitigate a lot of what will sneak in. A vestibule or revolving door even better.

In my area, the folks in the small markets just have to dress warmly and wear double socks in the winter.

Best to you,

Goober Dave

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