Discussions on Ductless Throw
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.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
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.