Passive house, heating combination with solar, energy recovery, photovoltaics?

Hello Bunnyguard

Maybe the issue has been resolved by now, if not: normally in a ventilation system with heat recovery the air is NOT rehumidified; the moisture is transported out with the "used" air and dry (because cold, even if it warms up again through the heat exchanger) air comes in. So you're right, dry air can definitely be a problem in winter... I don’t know which ventilation system you planned, there are models with moisture recovery MRV (enthalpy exchanger) for both central and decentralized ventilation. Seems worth it, everyone who has one wouldn’t give it up anymore.... Google a bit, you will surely find something.....

regards, catch22

Hello,

the values are not necessarily that great. In practice, 10% humidity recovery is often the limit.

In a passive house, user behavior has a very strong influence.
That means the moisture from the bathroom, kitchen, possibly utility room.

You can counteract this with plants, aquariums, or "Kleinbiotopen".

Here, the cooperation between the client and planner is required.

Best regards

That is certainly possible, I personally (still?) have no experience with either controlled residential ventilation or with HRV. But a few days ago I was at a passive house owner’s place for coffee, he has an HRV in his decentralized ventilation system (according to the manufacturer you can adjust the degree of HRV here, which according to the user is correct), and despite a masonry base oven in the living room and hardly any plants, the humidity in winter never drops below 40 or 45% (I don’t remember exactly now, but around that range...). Maybe there are one or two useful devices on the market... but plants, aquariums, and biotopes in the house also certainly have their charm....:)

Regards, catch22