Hello everyone,
We have been using a controlled residential ventilation system with a WR Nibe Ftx 230 W for one year in our energy-efficient house.
A technician recently found that the ventilation performance values on the test report appear to have been manipulated, as in my opinion no one has truly measured them, and the actual values are supposedly always within ±1% of the target.
The system runs at 100%, but the airflow in all rooms is only 4–5 m³/h (cubic meters per hour), which is far too low. In the basement, it is only 1.8 m³/h (cubic meters per hour). No control elements have been installed, and the system is airtight. The exhaust air in the kitchen, bathroom, and toilet is sufficient.
The ventilation unit works well, but the air volumes are much too low.
What could be the cause, and what can be done?
We have been using a controlled residential ventilation system with a WR Nibe Ftx 230 W for one year in our energy-efficient house.
A technician recently found that the ventilation performance values on the test report appear to have been manipulated, as in my opinion no one has truly measured them, and the actual values are supposedly always within ±1% of the target.
The system runs at 100%, but the airflow in all rooms is only 4–5 m³/h (cubic meters per hour), which is far too low. In the basement, it is only 1.8 m³/h (cubic meters per hour). No control elements have been installed, and the system is airtight. The exhaust air in the kitchen, bathroom, and toilet is sufficient.
The ventilation unit works well, but the air volumes are much too low.
What could be the cause, and what can be done?
Krolock schrieb:
....this is really the old approach-...... That may be, but it mostly applies. For comparison, see the "Concrete Company Feedback" section here in the forum. What do prospective homeowners ask about? For example, not one asks about the essential basics. Hardly anyone is interested in what energy consumption to expect for the building project in the future. When I inspect real-life installations and ask for the calculation documents => shrugged shoulders with the comment: "Oh, if only we had known that" Krolock schrieb:
....Ventilation is a bit different; measuring airflow volumes during final inspection is somewhat uncommon. No, it is standard procedure => measurement report. Comparable to the hydraulic balancing of the heating system. Additionally, there must be a duct network calculation. Krolock schrieb:
.......The question is only whether and how the airflow volumes in the rooms can be increased or if there is a duct damage or error. The device itself will probably not deliver more than the maximum of 100 %. This cannot be assessed remotely and must be clarified on site => expert assessment. Best regards
Krolock schrieb:
... Is it correct that a hallway and entrance area are assigned and calculated exhaust air values even though they have no exhaust air and are more likely “overflow” areas? There is no such thing as "half-pregnant" – it’s either one or the other! Overflow areas are characterized, among other things, by the absence of ducting in the air system. They receive supply air from the adjacent rooms providing supply air and are ventilated via the rooms providing exhaust air. Ideally, this means balanced pressure, i.e., the total supply air equals the total exhaust air.Thanks, Euro, for the good drawings. I just meant that the ventilation company probably couldn’t have measured the hallway and entrance areas themselves, since these don’t have supply or exhaust air. One error can be enough to call the entire ventilation concept into question; multiple errors would then be unforgivable...
Krolock schrieb:
I just meant that the ventilation company probably couldn’t have measured the hallway and entrance areas, as these themselves do not have supply or exhaust air. Correct. If measurement values are stated here, there is a strong suspicion that data manipulation took place. Best regards
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