Ultimate HVAC design for home studio.

Hi everyone. I'm posting this design in hope of getting some feedback. I have this posted on my build thread but no remarks. I think this is the only real solution I've seen that addresses all studio needs and comes in just short of $1500.

The idea is that when fan A is on (the inner of the two ducts) you get cold air coming into booth and the booth is slightly pressurized which i read is important. If you turn on fan B as well (outer duct on sketch) you get more circulation and fresh air is introduced. All you have to do is install cold air intake close to floor level and hot air exhaust close to ceiling level. Any feedback is welcome! Thanks.

I'm not an expert on HVAC but I see some problems here: You are running a duct for the intake of fresh air and at the same time removing heat from the booth ? And introducing fresh air to the building and removing heat at the same time ? Sounds impossible to me. You are placing the fresh air return near the cold air exhaust in the CR. Meaning if the outside temperature is hot your system turns out to be pretty inefficient

Andrebrito, Thank you for posting.

You are running a duct for the intake of fresh air and at the same time removing heat from the booth ?

Not sure why this is not clear to you. Notice the damper?

You are placing the fresh air return near the cold air exhaust in the CR. Meaning if the outside temperature is hot your system turns out to be pretty inefficient

The position of the openings is not represented in the sketch. As i said the cold air intake should be low and the hot air exhaust is hi.

I'm not an expert on HVAC

Me neither. I think we need some expert opinion.. :wink: Thanks.

The cold air intake should be away from the hot air exhaust in in the CR. I did notice the damper.. but circulation of air is made of pressure changes... I just don't get how you want to do such design using only one duct. Air does not enter and exit the duct at the same time. It enters of exists according to the air pressure changes or the help of fans. You should have a duct for fresh air entrance and a duct for the exhaustion. I never saw something like you suggested but maybe I'm wrong.

The cold air intake should be away from the hot air exhaust in in the CR.

It is. The sketch does not reflect position inside room. I clearly said that the cold air intake will be floor level and exhaust will be higher in the room.

i just don't get how you want to do such design using only one duct. Air does not enter and exit the duct at the same time. It enters of exists according to the air pressure changes or the help of fans.

The air flow depends on which fan is on. A or B or A+B. Fans are indicated, air flow is indicated. The only thing i didn't indicate is which is fan A and which is B. That is indicated in the follow up post. Fan A is the one sucking cold air from the CR. Fan B is Sucking hot air from booth and fresh air from out side. When fan A is on there is positive pressure in the booth because of the damper. If damper opens air will flow out side or back into the control but that will not be a substantial flow. If you turn fan B on as well it sucks air from outside into the CR. In a booth this small it is enough to pump air in with just one fan and air will exit through an exhaust with out the need for another fan sucking air out. I put another fan for the fresh air. I'm not sure how to better explain it.

I never saw something like you suggested but maybe I'm wrong.

If you have the Rod book you can see examples of ducts running through a building with small penetrations to the outside world for fresh air intake. That's exactly what i did. It is an interpretation but i think it represents the same air flow and pressure differences.

This is a perfect example of why you should get a building permit.

vonrock, If you don't have a constructive comment please don't post. This is not a street corner. I have building permits!

My apologies ERAN, I'm no expert in HVAC either, and you obviously want an expert. I realize this is not a street corner. If your local inspector has approved this plan, then you should go ahead and build it. You have stated that your sketch is inadequate twice. I'm surprised that you have a permit with this drawing (maybe you have a better one?), however, regions vary greatly in building codes and approval/enforcement of those codes. When another non expert tried to point something out, you seemed to brush him off. As a non expert myself, I can see what appears to me to be obvious errors with your idea. However, if a building inspector in your district has approved the plan, then you should not need any more non expert opinions. Good luck with your build, and be sure to keep us informed of your progress. Regards

vonrock, Thank you. If you see a mistake please explain what it is. It doesn't help when someone who says they are not an expert make general observations about some vague feeling they have that the design is flawed. The drawing is simple, and the design governed by the laws of physics. If it "doesn't work" there should be a "why" attached to it. vonrock said:

When another non expert tried to point something out, you seemed to brush him off.

What can i say, I'm trying to be polite but i guess my frustration is obvious. It's difficult to have a discussion on line if you don't read the previous posts. I think some of the comments made here are non linear at best and self serving at worst. The experts/moderators on this forum spend most of their time reading not commenting. When comments are made by these people it's usually short, factual and to the point. That is what i'm still hoping for... Here's a link to my build and another discussion i started. http://www.johnlsayers.com/phpBB2/viewt ... sc&start=0 http://www.johnlsayers.com/phpBB2/viewt ... sc&start=0