Dear forum,
My name is Markus, and we have just moved into a condominium in Dresden [built in 2016]. My question relates to this...
The apartment has a decentralized ventilation system from the company Lunos; specifically, the e² model with heat recovery. Aside from the fact that I find the fans extremely noisy, they also don’t seem to achieve their purpose. Take our bedroom, for example: 12 square meters (129 square feet). One fan is installed. This morning, after airing out the room by opening the windows, the humidity level was 55.6%. My wife worked in this room for 3 hours. Meanwhile, the humidity increased to 64%, despite the ventilation running on the highest setting.
The system’s filter is clean, so that can’t be the problem. The fan itself works; there is airflow. But this can’t be what the system was designed for: First, the fans on the highest setting are difficult to use because they are too loud at 50 decibels. And then even this highest setting can’t maintain the current humidity level? I don’t understand. In my opinion, these fans are completely ineffective.
Since our building is very well insulated, I actually have to air out the room by opening windows three times a day, otherwise the humidity quickly approaches 70%. Three times a day! This is really annoying and should not be necessary with a decentralized ventilation system.
Am I missing something here? Is this the case with all ventilation systems?
I would greatly appreciate any input. On one hand, because I would like to find a solution [different fans?]. On the other hand, because I find the situation so unbelievable. It can’t be that these "things" have no effect...
Best regards,
Markus
My name is Markus, and we have just moved into a condominium in Dresden [built in 2016]. My question relates to this...
The apartment has a decentralized ventilation system from the company Lunos; specifically, the e² model with heat recovery. Aside from the fact that I find the fans extremely noisy, they also don’t seem to achieve their purpose. Take our bedroom, for example: 12 square meters (129 square feet). One fan is installed. This morning, after airing out the room by opening the windows, the humidity level was 55.6%. My wife worked in this room for 3 hours. Meanwhile, the humidity increased to 64%, despite the ventilation running on the highest setting.
The system’s filter is clean, so that can’t be the problem. The fan itself works; there is airflow. But this can’t be what the system was designed for: First, the fans on the highest setting are difficult to use because they are too loud at 50 decibels. And then even this highest setting can’t maintain the current humidity level? I don’t understand. In my opinion, these fans are completely ineffective.
Since our building is very well insulated, I actually have to air out the room by opening windows three times a day, otherwise the humidity quickly approaches 70%. Three times a day! This is really annoying and should not be necessary with a decentralized ventilation system.
Am I missing something here? Is this the case with all ventilation systems?
I would greatly appreciate any input. On one hand, because I would like to find a solution [different fans?]. On the other hand, because I find the situation so unbelievable. It can’t be that these "things" have no effect...
Best regards,
Markus
G
Gecko192724 Oct 2022 17:09As @Tolentino already mentioned, a ventilation unit generally does not have a dehumidifying function (at least 99% of the units don’t).
The e² from Lunos appears to be a fan designed for alternating operation with a ceramic heat store. That means two fans would alternately blow air in and then exhaust it. However, since the fan does not have an enthalpy option, it does not provide moisture recovery.
Is it possible that the fan in the bedroom is connected to the one in the bathroom, causing your humid bathroom air to be directed into the bedroom?
What concerns me more is that you are measuring a value of 70% humidity at this time of year, despite ventilation.
With the current temperatures, humidity levels should generally stabilize around 50-55%.
Either your rooms are very small and you generate a lot of humidity yourselves, or there is another source in the apartment (plants, aquarium, water damage from above?).
The e² from Lunos appears to be a fan designed for alternating operation with a ceramic heat store. That means two fans would alternately blow air in and then exhaust it. However, since the fan does not have an enthalpy option, it does not provide moisture recovery.
Is it possible that the fan in the bedroom is connected to the one in the bathroom, causing your humid bathroom air to be directed into the bedroom?
What concerns me more is that you are measuring a value of 70% humidity at this time of year, despite ventilation.
With the current temperatures, humidity levels should generally stabilize around 50-55%.
Either your rooms are very small and you generate a lot of humidity yourselves, or there is another source in the apartment (plants, aquarium, water damage from above?).
S
SaniererNRW12324 Oct 2022 17:22Gecko1927 schrieb:
What strikes me as odd is that you are reaching a humidity level of 70% at this time of year, even with ventilation.
Given the current temperatures, levels around 50-55% would be more expected. However, I have 65% indoors and currently 73% outside. Considering there is a ventilation system, this seems to be a reasonable value. It is 21°C (70°F) inside and outside temperatures range between 14 and 19°C (57 and 66°F), with lower temperatures at night.
G
Gecko192724 Oct 2022 17:34SaniererNRW123 schrieb:
I currently have 65% humidity inside and 73% outside. With the ventilation system running, this seems to be an appropriate level. It’s 21 degrees Celsius (70°F) inside and between 14 and 19 degrees Celsius (57–66°F) outside, with lower temperatures at night. Of course, it always depends on the local climate.
At the moment, we have rainy weather at 13 degrees Celsius (55°F) and 91% relative humidity. Even this moist air, when heated to 21 degrees Celsius (70°F), results in only about 56% humidity indoors. If you have a ventilation system AND also ventilate manually, indoor humidity should rarely exceed 60%. Levels around 70% are possible but, with relatively cool temperatures and partly dry weather, they shouldn’t persist over several days – even with ventilation.
S
SaniererNRW12324 Oct 2022 18:24Gecko1927 schrieb:
Currently, we have rainy weather here at 13°C (55°F) and 91% relative humidity. Even this moist air only results in a humidity of 56% when warmed up to 21°C (70°F).Well, the data changes quickly when the temperatures are different. 85% at 17°C (63°F) drops to just under 70% at 20-21°C (68-70°F).W
WilderSueden24 Oct 2022 21:21I don’t see any relatively cool temperatures here. It has been a while since we had single-digit temperatures at night, so in the morning there is heavy fog. Except when it rains. Just a mild autumn here in Konstanz (think of Asterix in Britain asking, “Is it always this foggy where you are?”).
Right now, the necessary temperature difference to reduce humidity below 60% through ventilation is missing. If it were 3-4 degrees Celsius (about 5-7 degrees Fahrenheit) cooler, the situation would look completely different.
Right now, the necessary temperature difference to reduce humidity below 60% through ventilation is missing. If it were 3-4 degrees Celsius (about 5-7 degrees Fahrenheit) cooler, the situation would look completely different.
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