Reddit reviews Trane TD1 Ductulator with Sleeve, Duct Sizing Calculator
We found 4 Reddit comments about Trane TD1 Ductulator with Sleeve, Duct Sizing Calculator. Here are the top ones, ranked by their Reddit score.
Multi-Color red, green, and blueIncludes a protective sleeve with ASHRAE recommended design air velocitiesClassic Ductulator StyleOne side English, one side metricSize ducts using the equal friction method
Its been a while since I've done this, but the below should get you started. I may have missed some things though.
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Do you have a ductulator handy? Its the fastest way to do what you want. There are online calculators that can do the same thing but I've never found them to be as handy.
https://www.amazon.com/Trane-TD1-Ductulator-Sleeve-Calculator/dp/B01BUGXB7G
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Calculate the amount of air out of each room, decide on a maximum velocity of the air, IIRC 3 m/s is a good number for supply and extract from grilles as it doesn't create to much noise, and then size your duct. Note down the pressure loss that your ductulator says that you'll have through this section of duct and write down the length.
Where your individual extracts join together, you can have higher airflows as the noise shouldn't carry into the rooms to much. You could increase your air speed to say 4 m/s. Figure out the air flow though this duct, and calculate the size and pressure loss again. Also write down the length.
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Carry on like this all the way up to where your extract fan will be.
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Add up all your pressure losses over your index circuit (usually the furthermost extract grille to your fan, but you'll need to check this if all your duct fittings are not the same) - Pressure loss is calculated as (Pressure loss per metre of duct) x (length of duct) = Pressure loss for each section of duct. Add all these up over your index circuit. Calculate the pressure losses though your index circuit the various fittings (grilles, elbows, tees, balancing dampers, smoke/fire dampers, transitions, etc (basically anything that isn't straight duct).
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At this point you should know your total airflow and your total pressure loss that you'll experience in the system. Add on a fuck factor to your pressure loss (20% is what I've used for piping water, I'm not sure what a good factor is for ducts though). Then you can go to your supplier with your pressure loss and airflow and they will tell you what fan you'll need.
What you need is a duct-o-lator. Or search for HVAC duct design on youtube, there are many to choose from.
What you're looking for is something called a ductulator. It's a moving chart where you can easily translate iwc to cfm. Not sure how to link from mobile but Amazon has them for cheap and there may be an online version if you look.
https://www.amazon.com/Trane-TD1-Ductulator-Sleeve-Calculator/dp/B01BUGXB7G
I use the ductulator and the system syzer wheel (see bottom of page) on a weekly basis. If you're regularly designing equipment, they are free from your local Bell & Gossett or Trane representative.