ᐅ Mechanical ventilation with heat recovery for indoor air quality
Created on: 16 Nov 2011 13:08
W
wadi1982
Hello everyone,
Maybe it’s a silly question, but I’ll ask it anyway.
We are considering installing a mechanical ventilation system with heat recovery in our new build.
Now I have the following question:
I once read that to ensure the system works as efficiently as possible, you shouldn’t use the traditional method of airing out (turning off the heating and opening all the windows), since the mechanical ventilation takes care of the air exchange and regular airing only wastes energy. That seems reasonable to me.
But how does it work in summer? Here we often keep the patio door open all day. In that case, the system doesn’t seem to make sense.
Is it possible to switch off these systems somehow (and ventilate manually as needed)? After all, you wouldn’t want to blow warm air inside during summer either.
Maybe it’s a silly question, but I’ll ask it anyway.
We are considering installing a mechanical ventilation system with heat recovery in our new build.
Now I have the following question:
I once read that to ensure the system works as efficiently as possible, you shouldn’t use the traditional method of airing out (turning off the heating and opening all the windows), since the mechanical ventilation takes care of the air exchange and regular airing only wastes energy. That seems reasonable to me.
But how does it work in summer? Here we often keep the patio door open all day. In that case, the system doesn’t seem to make sense.
Is it possible to switch off these systems somehow (and ventilate manually as needed)? After all, you wouldn’t want to blow warm air inside during summer either.
A
AndyT240517 Nov 2011 15:35wadi1982 schrieb:
Regarding point 1: The 100 € includes the maintenance for the gas boiler, correct?
Regarding point 2: Unfortunately, I don't know more.1 => Yes, both together.
2 => I don’t think manufacturers would allow mold to develop inside the system itself. After all, controlled ventilation systems are specifically designed to prevent mold in living spaces by continuously exchanging the air.
Hello,
we are planning to install a mechanical ventilation system with heat recovery but are unsure whether to choose a central system, a decentralized system (e.g., inVenter), or if a combination would be more effective.
Based on information I gathered online and from discussions with experts, a central system can provide more efficient air exchange because it allows nearly complete airflow through all rooms connected to the system. The inVenter decentralized system tries to compensate for this disadvantage by having two fans operate alternately, storing heat in ceramic elements. However, in my view, this mainly highlights the benefit of a central system in achieving the most complete air exchange possible (although the inVenter concept is a definite improvement).
The drawbacks of central systems seem to be the higher costs and challenges related to cleaning.
I am also wondering whether basement rooms should be connected to the central ventilation system. It now seems more reasonable to ventilate basement rooms separately, especially if they are unoccupied and used, for example, as storage rooms. These rooms are typically heated less or not at all and, in my opinion, could negatively impact the heat recovery efficiency of a central system by cooling the outgoing air stream.
The best solution currently appears to be a combination of a central ventilation system in all living areas and a decentralized system in the basement, possibly even without heat recovery.
I would appreciate any experiences or further thoughts.
Tauben1a
we are planning to install a mechanical ventilation system with heat recovery but are unsure whether to choose a central system, a decentralized system (e.g., inVenter), or if a combination would be more effective.
Based on information I gathered online and from discussions with experts, a central system can provide more efficient air exchange because it allows nearly complete airflow through all rooms connected to the system. The inVenter decentralized system tries to compensate for this disadvantage by having two fans operate alternately, storing heat in ceramic elements. However, in my view, this mainly highlights the benefit of a central system in achieving the most complete air exchange possible (although the inVenter concept is a definite improvement).
The drawbacks of central systems seem to be the higher costs and challenges related to cleaning.
I am also wondering whether basement rooms should be connected to the central ventilation system. It now seems more reasonable to ventilate basement rooms separately, especially if they are unoccupied and used, for example, as storage rooms. These rooms are typically heated less or not at all and, in my opinion, could negatively impact the heat recovery efficiency of a central system by cooling the outgoing air stream.
The best solution currently appears to be a combination of a central ventilation system in all living areas and a decentralized system in the basement, possibly even without heat recovery.
I would appreciate any experiences or further thoughts.
Tauben1a
Hello,
Since they are not living spaces, the air exchange rates are correspondingly lower. The volume of heated air is likely lower than that of the other living areas. Therefore, the heat recovery is only slightly affected. In addition, it is not cold outside air being ventilated in, but a mixed air stream as a result of the heat recovery.
With decentralized ventilation, cold outside air enters the basement rooms. The heating load of the rooms above will increase!
Best regards.
Tauben1a schrieb:The question can, as almost always, only be reliably answered through a balance calculation. A key criterion is, among other things, the system boundaries. "Half measures" are not an option. Either the basement rooms are inside or outside the system/balance boundaries.
...I wonder, however, whether basement rooms should also be connected to the central ventilation system..... These rooms are usually heated less or not at all and would therefore, in my view, have a negative impact on the heat recovery of a central system, as they ultimately cool down the outgoing air stream.
Since they are not living spaces, the air exchange rates are correspondingly lower. The volume of heated air is likely lower than that of the other living areas. Therefore, the heat recovery is only slightly affected. In addition, it is not cold outside air being ventilated in, but a mixed air stream as a result of the heat recovery.
With decentralized ventilation, cold outside air enters the basement rooms. The heating load of the rooms above will increase!
Best regards.
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