ᐅ Location of the mechanical ventilation system with heat recovery in the underground basement?

Created on: 7 Feb 2012 08:42
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wadi1982
Hello everyone,

We are getting a controlled mechanical ventilation system with heat recovery.
For reference: The house has a footprint of about 130m² (1400 sq ft) and a living area of approximately 115m² (1238 sq ft).
We have just received the first plan from the architect.

Originally, the ventilation system was planned to be installed in the basement.
However, we now have the (fortunate?!?!?) situation that our plot is almost level.
This means the basement will be completely underground.
Because of this, the architect has revised the plan so that the ventilation unit will be located in the utility room.

Reason: The system needs a way to draw in and exhaust air. If we still wanted the ventilation unit in the basement, we’d either have to dig out a corner (which we want to avoid) or install so-called ventilation towers (= extra cost, and from what I found, they don’t look nice).

Now I have the following questions, hoping someone here can help me:

1. Could you simply run the two ducts (supply and exhaust air) in the basement to the outside and install a light well (window well) at that spot (of course without a basement window)? Then the supply and exhaust could be placed inside the light well, which I think wouldn’t look too bad. Or do the supply and exhaust ducts have to maintain a certain distance from each other?

2. If point 1 isn’t possible, could the ventilation unit be installed in the basement directly below the utility room? The supply and exhaust ducts would then run through the floor of the utility room into the basement and be vented to the outside in the utility room (hope that makes sense). That way, the openings would be placed higher.

3. If neither of these options work, how loud is such a system usually for a house this size? Would it be disturbing in everyday life?

Thanks in advance for your opinions!
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wadi1982
7 Feb 2012 22:15
OK. Thanks for the explanation. Since we are currently only at the stage of "does the floor plan suit us and are the windows OK," the calculation will come later.
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perlenmann
8 Feb 2012 12:47
wadi1982 schrieb:
I don’t quite understand at the moment.
It still needs to draw in and expel air from outside, right?

Come on, use a little imagination.

You install the mechanical ventilation with heat recovery in the basement, drill through the exterior wall (underground), and then connect a ground heat exchanger. Of course, the pipes must go up to the surface to draw in fresh air. But this way, you have the system in the basement and don’t need a shaft running up to the utility room to drill through the outside wall there.

Where exactly the heat exchanger draws its air from can surely be explained in more detail by one of the experienced users here.
It was just an idea since you want to place the mechanical ventilation system in the basement.
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wadi1982
8 Feb 2012 12:59
OK. At first, it sounded like it would be "drawing air from the ground," and I couldn’t quite imagine how that would work.
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wadi1982
3 Mar 2012 10:27
@Euro: Today we received an energy performance certificate with 21 pages full of numbers, tables, and charts.

Is this what you meant?
€uro
3 Mar 2012 12:47
wadi1982 schrieb:
..Is this what you meant?

No, this is only the certification for the compliance of the construction project according to the energy saving regulations or to achieve a certain efficiency level required by the KfW for obtaining funding.
The results from these certificates cannot be used to size a heating system or to provide a reliable assessment of the expected energy consumption. This is neither intended by the legislator nor permitted (scope of DIN 4701-10!).

Best regards

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