ᐅ How can you bypass energy-saving regulations and avoid bureaucratic hassle?

matte1987 schrieb:
Putting aside all the details about thermal imaging cameras, etc.:

As soon as there is a temperature difference (in Kelvin) between the inside and outside of a building component (wall/door/window/etc.), energy transfer occurs.

This energy transfer—in our case, heat loss in winter—can be easily calculated: etc...

Hi Matte1987,

thanks. I will take a closer look at the calculation shortly.

Just a quick note beforehand.
So you are referring to energy transfer and possibly heat loss in winter.

Shouldn’t we also consider where this lost heat actually comes from?
Just to put it simply:
If this lost heat through the exterior wall is provided by the sun anyway, why should I worry much? It will come back tomorrow anyway. I didn’t pay for it.

It’s a different matter, of course, if I have to pay for that heat! Then I want to keep it INSIDE the house as much as possible.
But if it’s free?

What am I missing?

The heat loss H = A × Delta T × U-value of the component

A = area, for a wall 3m wide and 2.5m high, that is 7.5m² (80.7ft²)
Delta T = 30 Kelvin (K) with 20°C (68°F) indoor temperature and -10°C (14°F) outdoor temperature
U-value of the component:

Old U-value = wall from an older building ~ 1.00 W/m²K (can be slightly more or less)
New U-value = wall from a new building ~ 0.20 W/m²K

Now calculating the heat loss is straightforward:

Old wall:

H = 7.5m² × 30 K × 1.00 W/m²K = 225 Watts (W)

To compensate for heat loss through this one wall and keep the room warm, I need to supply heating power of 225 Watts.

New wall:

H = 7.5m² × 30 K × 0.20 W/m²K = 45 Watts

With a new building, to prevent the room from cooling down, I only need to provide one fifth of the energy compared to the old wall example above.

So much for the claim that insulation is not worth it.

The best part:

If you don’t want an external thermal insulation composite system, take a monolithic (single-material) masonry wall.
For example, we use a brick, a Poroton T8.
At 36.5cm (14.37 inches) thickness—which is the most common building method here in Bavaria—it has a U-value of 0.21 W/m²K.

The example above is therefore by no means made up or nonsense.

Anything other than this simple fact that energy exchange ALWAYS happens only confuses you and is irrelevant here.[/QUOTE]

regarding winter:

Farilo schrieb:

Uninsulated/natural stone - 6:00 AM - exterior wall -> cold

when you heat, it is warm

Farilo schrieb:

Insulated - 6:00 AM - exterior wall -> condition???

cold

Farilo schrieb:

Uninsulated/natural stone - 8:00 PM - exterior wall -> warm

warm

Farilo schrieb:

Insulated - 8:00 PM - exterior wall -> condition???

cold

As I asked earlier, how do you conclude that the wall is cold in the morning and warm in the evening? If the sun shines on it, it might actually be a bit warmer in the evening. But this difference is so minimal that it can be neglected.

If you do not operate a sauna, the exterior walls are always cold.
The difference lies in the interior wall temperature and the heat transfer.

Without insulation, the wall temperature is somewhere between the indoor and outdoor temperatures... so in winter, it is warm compared to the outside temperature but cold compared to the inside temperature.

No, the wall temperature is usually slightly higher than the outside temperature.
The energy difference to the outside approaches infinity.

A practical experiment to try: dip a light bulb into a cold bathtub. You can touch it, and it is not warmer than the bathwater. If you wrap the light bulb in Styrofoam before dipping it into the bathtub, the Styrofoam will also be neither warmer nor colder than the bathwater.