ᐅ Quiet decentralized ventilation system for new single-family home construction
Created on: 1 Mar 2015 12:48
L
Legurit
Hello everyone,
During our first consultation with a building professional for a quote, we were asked to choose a ventilation system ourselves, as we are still somewhat skeptical about the "SEVi 160" model proposed by them. Our planner recommended a Halmburger ventilation system – we definitely want to see and listen to it in person. He also mentioned BluMartin, which personally seems a bit bulky to me – and once additional rooms are connected, it starts to feel more like a “central” system again. I also find the cassette filters quite expensive at 50 € (about $55) per unit per year.
We found the videos on the Bayernlüfter website quite appealing, but we are somewhat skeptical about the maximum airflow of 20 m³ (about 710 cubic feet) per hour. We also couldn’t find any information about noise levels at different ventilation rates (which is also missing for the SEVi – but the building professional mentioned that it can be heard).
We are looking for a ventilation system that can achieve an air exchange rate of 40 m³ (about 1,400 cubic feet) per hour (approximately 1 air change per hour for our bedroom) without being audible. Does such a system exist, or does anyone have experience with the mentioned brands? Is an air exchange rate of 1 per hour even necessary for a bedroom with two occupants?
Thank you and best regards.
P.S.: I have the impression that the decentralized ventilation industry is very fragmented with many small players.
During our first consultation with a building professional for a quote, we were asked to choose a ventilation system ourselves, as we are still somewhat skeptical about the "SEVi 160" model proposed by them. Our planner recommended a Halmburger ventilation system – we definitely want to see and listen to it in person. He also mentioned BluMartin, which personally seems a bit bulky to me – and once additional rooms are connected, it starts to feel more like a “central” system again. I also find the cassette filters quite expensive at 50 € (about $55) per unit per year.
We found the videos on the Bayernlüfter website quite appealing, but we are somewhat skeptical about the maximum airflow of 20 m³ (about 710 cubic feet) per hour. We also couldn’t find any information about noise levels at different ventilation rates (which is also missing for the SEVi – but the building professional mentioned that it can be heard).
We are looking for a ventilation system that can achieve an air exchange rate of 40 m³ (about 1,400 cubic feet) per hour (approximately 1 air change per hour for our bedroom) without being audible. Does such a system exist, or does anyone have experience with the mentioned brands? Is an air exchange rate of 1 per hour even necessary for a bedroom with two occupants?
Thank you and best regards.
P.S.: I have the impression that the decentralized ventilation industry is very fragmented with many small players.
L
Lebensprojekt27 May 2015 16:18The heat recovery is based on a heat exchanger. This also works in reverse when it is warmer outside than inside. In that case, the outside air is cooled down. However, what is missing is the bypass circuit, which ensures that cool air comes in directly at night.[/QUOTE]
How can the bypass circuit be implemented, or is it only available in central systems?
How can the bypass circuit be implemented, or is it only available in central systems?
By adding insulation, a new roof, or new windows and doors, airtightness is achieved, which can subsequently lead to mold. This significantly reduces natural infiltration.
I can briefly explain what happens in summer...
I usually install systems oriented north/south or east/west. This way, part of the fans are always on the cooler side. I recommend my clients set the system to ventilation mode in summer.
Provided the fans are connected correctly (it is always possible to change the rotation direction afterward), the fans on the north and east sides run continuously as supply air, while those on the south and west sides run continuously as exhaust air.
This effectively disables heat recovery, since a heat storage requires the air direction to reverse in order to realize heat recovery. Of course, one should not expect air conditioning from this system—it is not capable of that. However, it can lower the temperature by about 1 to 3°C (2 to 5°F). Better results can only be achieved with an actual air conditioning system.
I am not sure how this works with central systems.
I can briefly explain what happens in summer...
I usually install systems oriented north/south or east/west. This way, part of the fans are always on the cooler side. I recommend my clients set the system to ventilation mode in summer.
Provided the fans are connected correctly (it is always possible to change the rotation direction afterward), the fans on the north and east sides run continuously as supply air, while those on the south and west sides run continuously as exhaust air.
This effectively disables heat recovery, since a heat storage requires the air direction to reverse in order to realize heat recovery. Of course, one should not expect air conditioning from this system—it is not capable of that. However, it can lower the temperature by about 1 to 3°C (2 to 5°F). Better results can only be achieved with an actual air conditioning system.
I am not sure how this works with central systems.
D
DerBjoern28 May 2015 08:56Lebensprojekt schrieb:
How can the bypass circuit be implemented, or is it only available in centralized systems?Proper bypass circuits are usually only found in centralized systems. In decentralized systems that achieve heat recovery through switching the flow direction, as M.O. mentioned, bypassing is possible by disabling the flow direction switch.
M. O. schrieb:
Only with insulation, a new roof, or new windows and doors is airtightness achieved, which could then lead to mold growth. This strongly limits natural infiltration.Not exactly; a new roof, windows, and doors do affect this, but insulation itself is not directly involved. When those components are replaced, airtightness is, of course, carefully considered during installation. New windows and doors are naturally airtight, regardless of their insulation value. Airtightness in windows and doors is achieved through seals, in the roof by vapor barrier membranes, with joints sealed by adhesive tape, and in walls by the interior plaster. In the roof, insulation is installed above the vapor barrier, while in the walls it is applied outside the interior plaster.
Simply replacing windows and doors, without adding insulation to the roof and walls, already requires changing the previous ventilation behavior.
L
Lebensprojekt24 Jun 2015 22:58Unfortunately, I have no experience with it, but I haven't heard anything good about it either. There are other decentralized systems that are better.
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