Newly built apartment (KfW-55) cannot be cooled, always at least 25 °

2022-08-21 11:00:49

you can't get out with the great cloths either, at most stopping any further temperature increase.

oh man, I never said or meant that the cloths are the best of all solutions. They are a very good solution for tenants who now, in August, have a problem that might impair their quality of life if they cannot cope well with the heat or cannot sleep.
Because unlike the best of all blinds, this solution is ready in no time. Blinds, on the other hand, will probably only be available by the next summer season.

If I have a problem with the temperature in the apartment, I would already be very happy with no further temperature increase. Better than nothing in a hurry.

2022-08-21 11:02:35

Internal shading, in my opinion, has the greatest effect by preventing the direct heating of furniture or floors by the sun's rays.

After that, heat inside is heat inside. The "insulation effect" can only somehow work if I can specifically dissipate the heat behind the fabrics.

If the ventilation has no passive cooling - which I assume for decentralized systems - it will always get warmer in summer as a result. It must be completely off during the day.

We also use aluminum shutters very consistently on the outside. Nevertheless, you can clearly see how the heat keeps building up.

It cannot be ventilated out. The building fabric has simply heated up. Floors and walls always have a nice 24°C, even if I ventilate for 2 hours.

Only if I ventilate crosswise all night long could I possibly get it under control. But then I have all kinds of animals in the house and I close the bedroom door, so it doesn’t work there either.

Plants in the house also contribute to making the room climate feel less warm.

This physical effect is completely unknown to me so far? How does that work? I have the opposite opinion. Plants increase the humidity through moist soil and evaporation through the leaves, which raises the humidity and thus the dew point/perceived temperature.

2022-08-21 11:14:04

This physical effect is completely unknown to me so far?

I cannot really explain it physically. I would say that the plants create evaporative cooling. The rest is probably placebo for me. When I see the green plants, I just think that it can't be bad. That certainly helps too. :D

2022-08-21 11:29:37

I also strongly doubt that the installed heat pump has a cooling function. The ventilation would be the most electricity-intensive, brine only costs a bit of pump electricity. And if the heat is inside the place, you can’t get it out even with the great cloths, at most you stop further temperature increase.

I have been reading since spring? But the underfloor heating was still running then. Has the tenant ever interviewed the other residents of the house? Especially those on the same side and directly above.

I don’t think she has asked anyone yet. I have now contacted the company that installed the ventilation, the heating engineer, and the property management to inquire. Maybe this will provide some clues.

I also wonder whether 25 °C is really a lot in an apartment in summer? I myself live in an apartment from 1992 (facing south) and it can get up to 28 °C in high summer here as well. I can’t get the apartment below 23 °C at all in summer.

2022-08-21 11:36:56

It can't be aired out either. The building fabric has simply heated up. Floor and walls always have a nice 24°C, even if I air out for 2 hours.

Exactly!
Just (or precisely) because it is a new building doesn't mean you can control the environment and temperatures.
If there are 13 hours of sun outside and you have 10 sqm of windows facing south and west, you have to expect that after a few days the heat will remain inside as well. Even at 25 degrees! This applies to single-family houses as well as apartments, unpleasant for owners and tenants.
Anyone who still has the money now installs air conditioning right away. Those who don’t, and who installed generous window areas 10 years ago or today, buy a fan for the bedroom, possibly live in darkness with blinds, but can then look forward to cooler days in autumn when the sun comes through the oversized windows and the warming effect is seen as very pleasant and welcome. The tenant probably likes that too. That is probably also why she chose this apartment: nice and bright thanks to (oversized) windows. Rented as seen ;)
If I were you as a landlord, I would explain the physics to her. Because I think you have taken good precautions with technology and thermal protection. You can’t do anything about the extremely hot weather. It will be different again...

2022-08-21 11:38:55

Internal shading has, in my opinion, the greatest effect by preventing direct heating of furniture or floors by the sun’s rays.

After that, heat inside stays inside. The "insulation effect" can only somehow work if I can specifically dissipate the heat behind the curtains.

If the ventilation has no passive cooling – which I assume is the case with decentralized systems – then it will always get warmer in summer because of that. It must be completely off during the day.

[ATTACH alt="D2FAC6FD-3126-4FCD-A72F-A87B04B53133.png"]74143[/ATTACH]

We very consistently use external aluminum shutters. Nevertheless, you can clearly see how the heat keeps building up.

It cannot be aired out either. The building structure has simply heated up. Floor and walls always have a nice 24°C, even if I ventilate for 2 hours.

Only if I air crosswise all night long could I possibly get it under control. But then I have all kinds of animals in the house, and in the bedroom I close the door, so it doesn’t work there either.

This physical effect is completely unknown to me so far? How does that work? I have the opposite opinion. Plants increase air humidity and thus the dew point/perceived temperature through the moist soil and evaporation from the leaves.

So you have a similar situation to the apartment I described. If I understood correctly, the decentralized residential ventilation should be turned off during the day first and foremost, and during the day – when my tenant is not in the apartment anyway – the aluminum shutters should be consistently closed.
Are there disadvantages from the lack of ventilation during the day? Stuffy air?

Topic: Other heat sources: As far as I know, only a large fridge-freezer combination is operated in the apartment. Otherwise no other heat sources.

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Newly built apartment (KfW-55) cannot be cooled, always at least 25 °

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