ᐅ Bricks: Are differences in thermal conductivity of 0.03 noticeable?

11ant schrieb:

My house is as old as I am, made of monolithic aerated concrete with a thickness of 300mm (12 inches). It’s comfortable in any season. My annual energy bill shows I’m usually around the average. Just relax and don’t design your house focusing too much on that. We don’t even use sand-lime brick for the partition walls, and still, I can’t hear the dog next door (in case that’s your next concern after addressing the thermal transmittance).

Here we have solid clay bricks 360mm (14 inches) thick from before World War II.
Even our children don’t have to be cold in winter; the temperatures are around 20–22°C (68–72°F) depending on the room.

So don’t worry about staying warm—that will always be the case...

Arauki11 schrieb:

I would rather see the storage tank as a "gimmick," even though I have one myself. I would definitely invest more in the insulation of the house. Maybe a few points can be improved, and suddenly the insulation might even pay for itself.

Since an air-to-water heat pump is planned, the heating costs will appear on the electricity bill. If I also have a storage tank, I wonder whether the higher heating costs could be reduced or even eliminated by the photovoltaic system?

SoL schrieb:

360 mm (14 inches) solid brick from before World War II here.
Even our children don’t have to be cold in winter; we maintain 20-22°C (68-72°F) depending on the room.

So don’t worry about staying warm, it will always be fine...

That is very reassuring 🙂 and by my combination of a low-temperature heat pump and underfloor heating, you think it should work fine as well? Since money is quite important to me, I want to implement the financial and genuinely noticeable measures as well as possible. Conversely, I want to postpone the less perceivable measures to later. My only concern is that I might do it the other way around in some areas and regret it afterwards.

One thing I have to mention: The higher the thermal conductivity of the brick, the colder the exterior walls feel, even if the indoor air temperature is comfortable. I have the T10 bricks myself, and when I sit on my daybed in the office to relax (but not sleep), I lean against the exterior wall, and these days that’s no longer cozy, even though we have a room temperature of 21–22°C (70–72°F) — possibly even higher in the small office if I’ve been there all day and the computer is running at full power. Whether it would be noticeably better with the 7 series bricks, I cannot say...

So why think about this so much?

With T10 walls, the insulation would have to be better elsewhere, because I only managed to meet the 2020 building energy act, not quite reaching KfW55 standards. Your energy consultant will have to calculate precisely, as the component limit values, in my opinion, will be exceeded. Whether it still makes sense from a combined calculation standpoint has to be evaluated...

[QUOTE="IOSam23, post: 675440, member: 55391"]
Since a ground-source heat pump is planned, the heating costs are included in the electricity bill. If I also have a storage system, I wonder whether the higher heating costs could be reduced or even eliminated by the photovoltaic system?

10 kWp system:
December 2023: Production 125 kWh
December 2022: Production 155 kWh
December 2021: Production 152 kWh
==> If you consume more than 20 kWh on cold days, you can easily calculate how useful the storage system is.

August 2023: Production 1,180 kWh
August 2022: Production 1,310 kWh
August 2021: Production 975 kWh
==> Considering that you only produce hot water in summer, a storage system doesn’t make much sense for that period either.

Of course, the storage system can be discussed, but not only in relation to heating. Also keep in mind that both photovoltaic production and battery use involve costs, so careful calculations are necessary, and very often a storage system does not prove to be cost-effective.

IOSam23 schrieb:

And conversely, I want to place the less noticeable ones at the back. My only concern is that I might do the opposite in some areas and regret it later.

In that sense, I would move the stones to the back. Plan the house; the walls only frame the rooms.

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