Do that for all the ducts and branches on the table.
Evaporative cooler duct sizing.
Refine your configuration by adjusting static pressure desired indoor temperature air change method and ceiling height.
Like air conditioners evaporative coolers need to be the right size in order to adequately cool a room.
Evap cooling takes more air flow than heating so the ducts need to be sized for the cooling.
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The next step to choosing an evaporative cooler is to find a correctly sized unit.
Now find the total duct losses for each duct and branch that s very easy to do simply multiply the duct length by the pressure drop per meter in our example we found it to be 0 65pa m.
Pmi evaporative cooling sizing calculator.
The resulted will appear to the right.
The first fitting we ll look at is the 90 bend between ducts j and l.
The formula for a 1 500 square foot home with ceilings 8 feet high calculates as 1 500 x 8 12 000 cubic feet and then 12 000 2 6 000 cfm.
For coolers 4500 cfm or smaller use 18 ducts 20 for up to 5500 cfm and 24 for 6500 cfm.
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Use the calculator below to determine the appropriate cooler sizing based on your needs.
I m surprised the manufacturer recommends against round trunk lines they are common around here new mexico even for evap cooling.
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When it comes to choosing a portable air conditioner one of the most important factors to take into account is the model s btu rating.
You could size the main trunk line by the volume of the ducts to registers or you could just maintain the cooler outlet size.
Start by selecting the a geographic location the cooler will be used in and then cooler model.
Sizing evaporative coolers to select the size of an evaporative cooler you have to consider the airflow and the size of the area you have in mind to cool.
A good installer retailer will also take into consideration your local humidity levels before giving you an accurate quote.
The resulting number will correspond with the cfm cubic feet per minute of the evaporative system you need.
Metal duct evaporative coolers.
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