Heating of the supply air in the pipe

That I can’t cool the whole house with the controlled residential ventilation system is clear to me, but the fact that the pre-cooled air in the duct is raised to room temperature also makes the bypass useless in summer, or am I seeing that wrong? At least some fresher air should arrive. According to Paul, there should actually be a maximum warming of 1-2 degrees. But I wanted to hear how others are doing. As active cooling, we have 100m of brine pipe with a pump and a cooling element behind the first supply air filter. At the same time, this also works as heating in winter.

We have the same problem here: 30 degrees outside in summer, 26 degrees inside despite shading. Statement from the company Schwörerhaus, turn off controlled residential ventilation between 9 a.m. and 9 p.m.... open all windows at night and set exhaust air.

Well, as already mentioned, I don't see a problem. Without active shading and/or cooling in summer, modern and airtight houses become warm and stay that way, because that is primarily what they are built for.

The sun is simply there, and once the heat is inside, it stays in the house. That is what the insulation, [WDVS] or whatever you have on the house is for.

The controlled residential ventilation is primarily there for ventilation, and it does just that. But with the warm air from outside, you also have an additional factor that warms the house in summer besides the sun. By lightly precooling the air using a geothermal heat exchanger or brine, you gain a few degrees, but that only marginally extends the heating time of the house. However, once the heat is inside, it is inside and stays.

With the bypass, at least the air from outside (whatever temperature it may have) enters without also returning the heat from the house through the heat exchanger, because that is precisely what you don't want in summer.

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At least with the bypass, air from outside comes in (regardless of its temperature) without also returning the heat from the house through the heat exchanger, which is definitely not wanted in summer.

Exactly, that's what I mean, only that the air from the bypass is still warmed up in the pipe by up to 10 degrees (up to room temperature), which seems strange to me.

Why? If your pipe is inside the heated envelope and has no active cooling, why should cooler air come out of it?

If the air was cooled beforehand by the [Soletauscher], but then has to pass through the device at about 26 degrees and afterwards through the pipes at 26 degrees, the air will simply be warmed up again by this and as soon as it meets the room air, it’s over anyway and everything is homogenized again.

Ok, thank you very much for your answers. However, I had already expected that at least some cooler air would come out. What do I need an expensive ventilation system with heat exchanger and bypass for, if the storage capacity of air is low anyway and everything is warmed up in the pipe anyway? Sounds almost like a Perpetuum Mobile