HVAC - Split-Ductless w/ fresh air solution?

[realdoyle]

Thank you gn87berner. I'm considering that. Anyone else want to weigh in on my suggested solutions for this? I'd love as much expert feedback as possible. It seems that doors and ventilation are the two areas most prone to sound leakage, so I want to get this right.

Thanks.

[Soundman2020]

I agree: I reckon doing it outside will give you more space, more flexibility, and much simpler access for maintenance. It will have to be heavily isolated, though!

[realdoyle]

Thanks for the feedback. I did a quick sketch-up of how the external silencer ducts might look. One to push fresh air in, and the other to pull stale air out. I put the fans inside the silencers so they can be a one piece all-purpose enclosure, protected from the weather. The silencers will of course be lined heavily with duct insulation and the entire silencer will be attached and sealed tightly to the outside of the building so the fans can push and pull air respectively.

The only thing not shown is the vent that will come from the inside of the studio, through the walls and open into the external silencers.

I'm sure I am making several hvac mistakes in this design. Please let me know how I can make it better or any other ideas that might be more effective. Also, any suggestions on what kind of quiet yet powerful fans to use?

[realdoyle]

Here is another sketch-up that might illustrate how the silencer box with internal fan will relate to the building itself. Please disregard scale. I haven't gotten to the size of the silencer box, I'm just wanted to make sure I'm heading down a logical path first.

Thanks.

[realdoyle]

UPDATE: I just realized that I never posted photos or updated this thread about Fresh Air with a Split-Ductless. I posted the final pics and details on this page of my build thread here: http://www.johnlsayers.com/phpBB2/viewt ... 8&start=30

Hopefully that helps. I was really happy with the results and used the studio for over 5 years with no problems.

-Josh

[will1992]

Hi all,
I've been looking for a single AC/ventilation solution for a new studio I am building in my backyard. It's 12'x16' with 8ft walls and peaked ceiling. It's got a 4" thick concrete foundation with 18" deep footings w/rebar. The framing is 2x4 @ 16" O.C. The ceiling beams are 2x8's.

My idea came after seeing a diagram in Rod's book (page 130). I was very interested in buying one of those split-[SPAM REMOVED SPAMMER BANNED] systems until I found out that they didn't actually provide any fresh air to re-oxygenate the room. I'm specifically talking about out Mitsubishi's Mr Slim split ductless system (the 9500 btu model). split ductless system (the 9500 btu model). From what I've read, it seems they do have two air lines: one that takes the air out of the room (Return Air) and then another line that brings the newly cooled air back into the room (Supply Air). But it's a closed system. What if I customized one of the lines and opened it up to some fresh air.

So my idea is... what if I splice in a "fresh air" vent/pipe into the Return Air line on the outside of the building but before it reaches the condenser unit to be cooled and sent back inside the building.

It would be just like Rod's diagram on page 130, only it would be ductless and wouldn't have the "mechanical room".

My main concern is would the system actually suck enough fresh air from the newly spliced "Fresh Air Supply" vent/pipe? Would the vacuum of the airflow system be enough to bring in fresh air from outside? I'm thinking of this like a siphon; the system would still suck the warm air out of the room and blow in cool air but the open vent (in between the outside wall and the condenser unit) would allow fresh air to be "siphoned" into the system to be cooled and then blown into the room.

What do you guys think? If this would work then I'd just need to find a de-humidifying solution and I'll be set.

As I'm writing this I get the feeling it is too easy of an idea to work.

Thanks for any advice on this,
-Doyle

I am giving a very good suggestion to you don't have to do so many thing. Just make a ventilation for exhaust fan. Then take a single fresh pipe line from your main HVAC system to you backyard and then to your Studio just use window AC panel and fit the fresh air pipe line to it.

[Soundman2020]

I am giving a very good suggestion to you don't have to do so many thing. Just make a ventilation for exhaust fan. Then take a single fresh pipe line from your main HVAC system to you backyard and then to your Studio just use window AC panel and fit the fresh air pipe line to it.

Ha ha ha. Nice try! Did you REALLY think that the moderators would not notice your not-so-clever spam hidden in the quoted message? Not very smart. Especially when you post a reply to a thread this is nearly seven years old!

Spammers get dumber by the day.

(And no, you were giving a really stupid suggestion. Thank heavens we killed your link before somebody took your advice!)

- Stuart -