Discussions on Ductless Throw
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I’m at the point now where I’m locating the wall-mounted fan coil units in my heating/cooling system and I’m trying to get advice on location.
There are some good discussions about throw adapted from situations with ducted HVAC, such as Jon Harrod’s excellent series https://www.greenbuildingadvisor.com/article/grilles-registers-and-diffusers-part-3-supply-air-outlets
as well as articles such as Arlan Burdick’s Air Distribution Basics and Design paper, which complements Manual T:
https://www.nrel.gov/docs/fy12osti/53352.pdf
However, all of these discussions refer to central air ducting, with multiple supply vents/diffusers and a return. Although many of the discussion points and advice (eg, about Coanda Effect wrapping air flow along surfaces, placement of hot/cold air streams in front of windows) also definitely apply to ductless, I’ve had a difficult time finding building science-oriented articles which focus solely on ductless air handler placement, as opposed to collections of rules of thumb guidance.
Can anyone point me in this direction? In principle, I can continue to use a combination of experience, common sense, and rules of thumb guidance from the ducted world, but I’m wondering if there is any good literature out there which focuses on ductless design.
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Replies
Hi @WilliamLi .. I don't have specific advice, but I think we are working on similar problems. I'm working installing low-static ceiling mounted fan coils AERMEC FCZ-I-EUP (ECM Fans) and linear vents by Titus (or similar) . I've seen similar units installed in other sites. They commonly have a return in the hallway and short ducted supply from the unit to diffusers in the ceiling of the rooms to be cooled. As a diffuser supplier Titus has training material that may help. https://www.titus-hvac.com/main/Titus%20University . Let me know if you want to connect. I'm also an ex-engineer in the Vancouver area working on retrofitting a heat pump and cooling to an existing older home.