ᐅ How can you tell when the mechanical ventilation system is working properly?
Created on: 2 Apr 2014 12:36
J
Jaydee
Hello,
sorry if this is a silly question, but how can I tell if the mechanical ventilation with heat recovery is working properly? We just turned on the system after finishing the interior, about 6 weeks after moving into the house. According to the recommendation, we should only switch it on once most of the dust has settled.
Now I don’t hear anything from the system (except in the utility room when I’m standing right next to it). How can I be sure it’s working correctly? At the fresh air outlets, I only feel a very slight breeze.
Is this normal? ops:
Thanks,
Julia
sorry if this is a silly question, but how can I tell if the mechanical ventilation with heat recovery is working properly? We just turned on the system after finishing the interior, about 6 weeks after moving into the house. According to the recommendation, we should only switch it on once most of the dust has settled.
Now I don’t hear anything from the system (except in the utility room when I’m standing right next to it). How can I be sure it’s working correctly? At the fresh air outlets, I only feel a very slight breeze.
Is this normal? ops:
Thanks,
Julia
Basically, it is perfectly fine if you don’t notice any airflow noise or drafts. That is the ideal situation, but it doesn’t indicate whether the system is properly sized. Removing moisture also takes some time; it doesn’t happen within 10 minutes. Without knowing more details about your system, it is difficult to provide a remote diagnosis. In any case, as I mentioned before, I would get a device to measure humidity in order to monitor it. Many small weather stations (for example, from Aldi) have this function built in.
D
DerBjoern22 May 2014 12:21With our system, we don’t hear anything at all. Only at night, when you’re in bed and the system is set to party mode, it becomes noticeable. On the highest normal setting, however, it is not audible.
In the bathroom, our mirrors fog up during a shower. It just takes some time for them to clear again. This is certainly also related to the size of the bathroom. In a large bathroom, the moisture can probably spread more evenly than in a small bathroom with a huge shower and large evaporation surfaces.
In the bathroom, our mirrors fog up during a shower. It just takes some time for them to clear again. This is certainly also related to the size of the bathroom. In a large bathroom, the moisture can probably spread more evenly than in a small bathroom with a huge shower and large evaporation surfaces.
Hello,
depending on the setting, you should feel a very slight draft near the air outlets and a gentle suction at the exhaust vents.
Everyday test: with the bedroom door closed and windows shut overnight, you should have perfectly fresh air—something that usually isn’t the case.
Additionally, you should consider buying a small digital hygrometer (under 20€) and place it in the room. With a standard heat exchanger, the humidity level may be too low, so you might want to choose a lower setting and/or invest in an enthalpy heat exchanger. You can check if the heat recovery is working properly by using a simple digital thermometer placed directly at an air outlet when outdoor temperatures are low.
If, for example, the outdoor temperature is -10°C (14°F) and you only measure 5°C (41°F) at the air outlet, something is not right.
Best regards
depending on the setting, you should feel a very slight draft near the air outlets and a gentle suction at the exhaust vents.
Everyday test: with the bedroom door closed and windows shut overnight, you should have perfectly fresh air—something that usually isn’t the case.
Additionally, you should consider buying a small digital hygrometer (under 20€) and place it in the room. With a standard heat exchanger, the humidity level may be too low, so you might want to choose a lower setting and/or invest in an enthalpy heat exchanger. You can check if the heat recovery is working properly by using a simple digital thermometer placed directly at an air outlet when outdoor temperatures are low.
If, for example, the outdoor temperature is -10°C (14°F) and you only measure 5°C (41°F) at the air outlet, something is not right.
Best regards
One00 schrieb:
At a room temperature of 20 degrees Celsius (68°F) and an outside temperature of -10 degrees Celsius (14°F), 5 degrees Celsius (41°F) would be exactly what I would expect at the outlet or immediately after the heat exchanger when it is working properly...?!?!?Even at subzero temperatures around minus 10 degrees Celsius (14°F) and with a low air exchange rate (to prevent freezing), the supply air temperature with a standard heat exchanger was always in the double digits. Otherwise, it would indicate a very poor efficiency.
Best regards
In an air-to-air heat exchanger, the heat transfer can theoretically only occur up to the point where the supply and exhaust air temperatures are nearly the same, right? In the case of 5 degrees Celsius and the parameters mentioned above, that would be the case.
Are you referring to the supply air at the outlet (which, at such low outside temperatures, is naturally significantly higher due to additional heat gain within the building envelope than directly behind the heat exchanger) or directly behind the heat exchanger?
Cascada schrieb:
Even at subzero temperatures around minus 10 degrees and a low air exchange rate (to prevent freezing) with a standard heat exchanger, the supply air was always still in the double digits. Otherwise, the efficiency would be terribly poor.
Best regards
Are you referring to the supply air at the outlet (which, at such low outside temperatures, is naturally significantly higher due to additional heat gain within the building envelope than directly behind the heat exchanger) or directly behind the heat exchanger?
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