small tube forced air system

[News]

This company states that their 3.5 inch tubes with high velocity air is
quiet and effective at heating a house. Has anyone had any experinece of
their systems?

http://www.unicosystem.com/

 

[m Ransley]

Great systems for air conditioning retrofit on houses with radiator
heat. we had one intalled in 91. They fished all the tubes through
without cutting walls up. They are retrofit into ceilings. But I
question heating, What do you have now.

 

[News]

Great systems for air conditioning retrofit on houses with radiator
heat. we had one intalled in 91. They fished all the tubes through
without cutting walls up. They are retrofit into ceilings. But I
question heating, What do you have now.

I don't have forced air. I am looking at systems for mainly heating and
this appears to defy some laws. Fast moving air usually is noisy. If this
unico noisy? You say not good for heating. It is heating I mainly want it
for.

 

[Bughunter]

I saw a high velocity system installed on a very high end (>$5m?) home in
MA. I believe it was used for both heat and air conditioning. They claimed
it was very quiet and worked well for them. I don't know if it was
unizosystem or not but it was a "high velocity" with lots of little 2" vent
openings everywhere. I did not notice any noise.

I'd say it would be worth investigating further, as everything in this house
was first class.

 

[m Ransley]

Its not as quiet as duct. What do you heat with now. Im not familiar
with using it for heating, im a user of the product. Post at alt hvac
if you can stand the insults that you will get. Or " The Wall " or
alt.home.repair

 

[Dale Farmer]

I saw a high velocity system installed on a very high end (>$5m?) home in
MA. I believe it was used for both heat and air conditioning. They claimed
it was very quiet and worked well for them. I don't know if it was
unizosystem or not but it was a "high velocity" with lots of little 2" vent
openings everywhere. I did not notice any noise.

I'd say it would be worth investigating further, as everything in this house
was first class.

Never seen one myself. What makes the noise in a forced air system is
actually turbulence. Rough surfaces inside the ducts, corners, and grills
induce turbulence. Higher speed air makes more turbulence. ( handwaving
laminar flow here. ) By going to long, continuous pieces of tubing that
have an smooth and even internal surface, and many smaller air vents, they
can greatly reduce the turbulence and thus, the noise created. The higher
air speed also reduces dirt buildup in the system as an added benefit.

--Dale

 

[News]

Its not as quiet as duct. What do you heat with now. Im not familiar
with using it for heating, im a user of the product. Post at alt hvac
if you can stand the insults that you will get. Or " The Wall " or
alt.home.repair

I did a Google on alt.hvac. What bunch of insulting nuts. If they want a
closed buddy group they should set up passwords and only speak to
themselves. I see why HVAC people are regarded as sharks in the US.

 

[m Ransley]

They hate homeowners there but the group isnt listed a pro person only,
yea they are asses.
Its fun to go there if you want to troll and start a fight, thats
about it.

 

[John Gilmer]

By going to long, continuous pieces of tubing that
have an smooth and even internal surface, and many smaller air vents, they
can greatly reduce the turbulence and thus, the noise created. The higher
air speed also reduces dirt buildup in the system as an added benefit.

That's half of the "trick." The other half is that the cold air is colder
and the hot air is hotter than you usually see in high efficiency HVAC
equipment.