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

In the direct heating system (direct evaporation), the working fluid of the heat pump circulates as the heat transfer medium in the ground collector and evaporates there. Intermediate heat exchangers and brine circulation pumps are omitted. Seamless copper pipes with a plastic coating are used.

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Photovoltaics is an investment option for your equity and has nothing to do with a house. You invest money and expect a return. Here, assume 3%. This excludes external capital, because then you have no profit left, only a loss. You are basically an electricity producer and therefore also a business operator.

That means if you make, for example, 6% with a well-performing fund, you can offset this profit against your expenses, only more remains for you in the end.

hm, so if I understood that correctly, these are basically ground collectors that you can lay in the garden and that's it. How is the heat transferred into the house, through the air again or in the form of radiators or something like that?

And how many square meters do you need for about 160 sqm of living space?
And what does something like that cost?

So would a comfort ventilation system with heat recovery,
a small DV heat pump,
and a solar system for hot water be enough?

Or is the register heating in the comfort ventilation still necessary?

Hello Bunnyguard,

for the flat plate collectors, you need about 250 m, laid at a depth of about 1.2 m.
Costs about 4500 - 5000 €, plus about 2500 € for the earthworks.
Due to the low flow temperature, the heat is best supplied via a heat pump with underfloor heating.

Well, I don't really count earthworks much as it costs me almost nothing because of my father. And everything can be set up so that it is all controlled automatically, or am I messing around every day to make sure the temperature in the house is right?

And the hot water is then also fed into the buffer for hot water, so that you have hot water all year round, not just in the summer when the solar system is running like crazy...

Then a comfort ventilation system with heating coil is not necessary, or should it be integrated just to be safe?

That means the best solution for heating a passive house is the following:

- Comfort ventilation with heating coil and heat recovery
- Solar system for hot water
- DV system for hot water and for additional heating

Is that correct or is something still missing?

And which manufacturers can be recommended for these things, in terms of service, etc.?

Planning a passive house is unfortunately not that simple. You really need a competent planner. The local conditions regarding the location of the house on the property, possible shading by trees, etc. must also be taken into account. Then there are the building components, U-values of the walls, windows, etc.; avoiding thermal bridges, for example, also belongs in expert hands. With me, for example, you can argue well whether a solar system even makes sense; in summer, you don’t want to shower that hot anyway, in winter the system brings little to no benefit. The costs will only pay off after about 60 years, but the system won’t last longer than 15-20 years. But for the energy certificate, such a solar system is always positive :cool:

Yes, of course, it has to be calculated and planned by a professional. But you have to inform yourself so that when you hear something somewhere, they don't say you have no idea about anything and don't know what you want. Well, if a solar system doesn't make much sense, I'll discuss it with the architect, etc. and leave it out. If ground collectors for hot water are sufficient all year round, there's no need to plan a solar system. In summer, I think the ground collectors will provide enough hot water anyway, and if they suffice well in winter, that's completely sufficient. The only question is what if the hot water is not enough in winter? I don't have a heater to make hot water... What do you think, how warm can you heat all year round with heat recovery and the ground collectors? No limitation, or does, for example, nothing work above 20 degrees? And what do I want with the energy certificate? Does it have any advantages for me regarding the solar system?