ᐅ Advantages and Disadvantages of Ventilation and Exhaust Systems
Created on: 20 Nov 2013 10:45
K
kaho674
Hello,
I don’t believe such a system is absolutely necessary, or rather, I haven’t yet seen the significant benefits it offers. I prefer to simply open the window. What are the advantages of a ventilation and exhaust system, and what might be the drawbacks?
I don’t believe such a system is absolutely necessary, or rather, I haven’t yet seen the significant benefits it offers. I prefer to simply open the window. What are the advantages of a ventilation and exhaust system, and what might be the drawbacks?
B
Bauexperte21 Nov 2013 06:33Hello,
That’s not true. Even the latest generation of central mechanical ventilation with heat recovery “malfunctions” when a window is opened and the system runs at the same time. These systems simply are not designed for that.
What exactly do you mean by that?
Thanks to mechanical ventilation with heat recovery, do you really have the same temperatures in the attic or loft as on the ground floor?
Large-leafed plants can help with that.
A mechanical ventilation with heat recovery system is always a good idea, especially if multiple room airing sessions in the first two years after moving into a single-family house are not ensured. Whether it is designed as a central or decentralized system depends both on personal preference and the available budget. Whether the heat recovery is as significant as the industry claims, or if it mainly serves the calculations of funding organizations like KfW, remains to be seen.
Such a system will not pay for itself financially, but it provides its owner with a significant improvement in quality of life. And that, in my opinion, is not something to underestimate.
Best regards, Bauexperte
Mycraft schrieb:
The nice thing about a mechanical ventilation with heat recovery system is that you can still open the windows if you want
That’s not true. Even the latest generation of central mechanical ventilation with heat recovery “malfunctions” when a window is opened and the system runs at the same time. These systems simply are not designed for that.
Mycraft schrieb:
Pros:
- less heat loss in winter
- better heat distribution in winter
What exactly do you mean by that?
Mycraft schrieb:
- better temperature distribution in summer
Thanks to mechanical ventilation with heat recovery, do you really have the same temperatures in the attic or loft as on the ground floor?
Mycraft schrieb:
Cons:
- dry air in winter
Large-leafed plants can help with that.
A mechanical ventilation with heat recovery system is always a good idea, especially if multiple room airing sessions in the first two years after moving into a single-family house are not ensured. Whether it is designed as a central or decentralized system depends both on personal preference and the available budget. Whether the heat recovery is as significant as the industry claims, or if it mainly serves the calculations of funding organizations like KfW, remains to be seen.
Such a system will not pay for itself financially, but it provides its owner with a significant improvement in quality of life. And that, in my opinion, is not something to underestimate.
Best regards, Bauexperte
1. If the system does not support dynamic pressure control (which most systems do not), nothing "goes wrong" when the windows are open... the system is set to a fixed volume of 50, 150, or 300 cubic meters (cbm) per hour and extracts or supplies exactly that amount. The system does not care where the air comes from, whether it’s from an open window or the closed room.
2. What I mean is that the system retains the heat inside the house, and additional heat sources such as the sun, a fireplace, or others do not just warm one room but distribute the warmth throughout the entire house, even if only slightly.
3. Yes, precisely, the mechanical ventilation with heat recovery keeps my house “at temperature,” meaning the whole house does not get as warm as houses without such a system.
4. Well, plants only help to a limited extent as well...
2. What I mean is that the system retains the heat inside the house, and additional heat sources such as the sun, a fireplace, or others do not just warm one room but distribute the warmth throughout the entire house, even if only slightly.
3. Yes, precisely, the mechanical ventilation with heat recovery keeps my house “at temperature,” meaning the whole house does not get as warm as houses without such a system.
4. Well, plants only help to a limited extent as well...
P
perlenmann23 Nov 2013 08:11I haven’t read the entire post, as I just got back from vacation. New build at a “Zentrierter Park” Bostalsee. No idea if those buildings have to comply with the Energy Saving Ordinance (EnEV)/building energy regulations. They were certainly airtight.
The building didn’t have a mechanical ventilation system with heat recovery, and right away we had serious problems with fogged-up windows again. That’s all the argument I need in favor of mechanical ventilation with heat recovery.
The building didn’t have a mechanical ventilation system with heat recovery, and right away we had serious problems with fogged-up windows again. That’s all the argument I need in favor of mechanical ventilation with heat recovery.
We are very glad that we included a mechanical ventilation system with heat recovery in our plans. Besides the benefits of no longer having to worry about mold and not having to ventilate constantly, the air quality is really excellent. When we switched off the ventilation system for technical reasons for two days, we realized how quickly the air quality declines.
However, I recommend planning early on where the ductwork will be routed and how the ventilation unit, silencer, and distribution system will be arranged, so that unsightly bulkheads do not end up in unwanted places in the living area, or so that silencers are not too short because the layout of the components in the utility room no longer allows for the proper configuration.
We have a central mechanical ventilation system with heat recovery from Helios. We just managed to avoid large unsightly bulkheads, but the silencer is probably a bit too short (42 cm (17 inches) in length); at least, the noise level is not quite satisfactory. Additional internal duct silencers may now need to be installed in the individual rooms.
However, I recommend planning early on where the ductwork will be routed and how the ventilation unit, silencer, and distribution system will be arranged, so that unsightly bulkheads do not end up in unwanted places in the living area, or so that silencers are not too short because the layout of the components in the utility room no longer allows for the proper configuration.
We have a central mechanical ventilation system with heat recovery from Helios. We just managed to avoid large unsightly bulkheads, but the silencer is probably a bit too short (42 cm (17 inches) in length); at least, the noise level is not quite satisfactory. Additional internal duct silencers may now need to be installed in the individual rooms.
M
meister keks27 Jun 2017 23:18Der Da schrieb:
Yep... as soon as a room has an open window, the calculated airflow in the house no longer works properly. However, the power consumption at the lowest setting is really not high. In summer, you turn the system off during the day anyway... in winter, it stays on until it gets too cold in the rooms at night.
Why do you turn it off during the day?
I always keep mine running, the thermostat is set to 22 degrees Celsius (72°F), and if the air gets too warm, the system cools automatically.
H
Hausbauer128 Jun 2017 23:26How much does the installation of a mechanical ventilation system with heat recovery usually cost? I was once given a rough estimate of 10,000 euros. Is that realistic?
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