Ceiling mounted AHU unit

[DrenAhmeti]

Hi guys,

I'm an architect with a very a limited MEP knowledge. I've been watching and reading online these couple of days regarding the AHU ceiling mounted units. I'm getting there but I though better to consult someone more knowledgeable.

I have a problem I must resolve, I have to solve the ventilation system for an apartment.

I have created the AHU unit from a generic model. It has 4 ports, with the necessary in/out duct connectors. 

What I'm having trouble is that I'm not sure as to how the exhaust air and the incoming air will be handled, will it be directly to the wall or it should connect to the shaft so that then it can connect to a vertical in/out outlet for the entire residential unit. I would imagine it would have to be directly connected to the outside wall otherwise why use this system.

If that is the case, as I think it is, how do I connect the AHU unit to the wall with what connectors/ducts.

Please see attached the photos of the problem and my current progress.

Thank you!

[RobDraw]

There are many ways that an AHU can be configured depending on the design. Your description is kind of vague and lacking details. Exhaust and outside air should be connected to the outside of the building. The supply and the extract air serve the inside of the building. 

[DrenAhmeti]

That is what I assumed, being that the unit is all in one and it has the appropriate vents for in/out from the outside.

[DrenAhmeti]

What ends should I use for the external walls?

Both for incoming and exhaust.

[RobDraw]

You have several choices. What does the project require?

[DrenAhmeti]

I'm having trouble with the connection since the supply ducts are automatically connecting to a wrong opening.

[RobDraw]

Sorry to hear that. Since this looks like an assignment, I'm not going to help any more. Someone else might but I don't do that kind of thing. Here's a hint: A resourceful person might try a couple of searches on their "go to" search engine.

[DrenAhmeti]

No problem, as I said it is not my cup of tea, being an architect.

I have actually come so far from this morning, maybe there is someone more helpful.

[RobDraw]

Is doing internet searches beneath you? There's a vast amount of information out there that would give you the guidance you need.

[DrenAhmeti]

I'm on my PC from 9 AM, so nearly 12 hours. Watched countless of Indian, Norwegian and English tutorials, some 1 hour long.

As you can imagine, as I said I know knew pretty much 0 regarding MEP, it is a bit hard when you don't even know even the terminology that is being used. There are so many tabs open on my browser that I don't know which is which just by looking at them.

As long as it took you to write that, you could copy paste a helpful link here since you can't explain.

[RobDraw]

If you spent that much time trying to learn, How do you expect me to help with a single link?

Sorry, but I earned my education and since I don't really know the nature of the assignment, I'm not offering any more assistance. The assignment seems to assume a basic understanding of HVAC design and doing it in Revit. Maybe it was a part of this class or maybe it was a prerequisite. I don't know.

"For those reasons, I am out."

[iainsavage · Accepted solution]

What you appear to have here is a whole house ventilation system with heat recovery.

You seem to have just about cracked the supply and extract although in your image there looked like the might be some connections missing?

The fresh air intake duct and exhaust duct could be connected to grilles/louvres in the external wall or to roof terminals. That choice is up to you as the designer.

Hope I've understood the question correctly.

If you can source this document it might help:

[DrenAhmeti]

Hi iainsavage,

Yes, as you said it is a unit AHU. But being an apartment and not a house I placed the AHU unit, since it had to be ceiling mounted, in the utility room above the ceiling. Being that the utility room was directly placed to the external wall. 

As you can see in the photo attached I placed an exhaust grill for the exhaust air and an intake hood for the intake air. 

Now the system is closed and everything is linked up.

Feel free to suggest anything, thanks for the help.