Latest / RENEWA Sanierungsnavigator / Feuchtigkeit & schlechtes Raumklima: Woran es liegt & was hilft!
Transcript
- Oliver: We can talk about heating costs, about U-Values or heat efficiency, but in the end space climate and comfort are And what factors depend on the construction, what helps and what the walls have to do with my guest Florian Pelke today in the Reneva sanation navigator. And with I would say let's go. Hi Florian, there are cases where real and choices just fall One point is that it can feel cold, but the heating is already on. Now tell what is the On one hand, everyone has their own perception of temperature and well-being. You know that too, sometimes it on the cycle. Did I just do or did I sit quietly time or something? But what you certainly want is the building physical aspect in a room. And we're about the comfort. It also massively whether we comfortable or warm And comfort is not only by the heating, which is for the room temperature, but also by other things. But comfort doesn't sound like a real building physical term, so to speak. It sounds very... So what does that from a point view and why isn't room temperature Comfort is defined in heating and climate technology in way that the person in a room and doesn't any changes in the room climate. So no one has to a blanket or to their sweater. And air temperature is not enough because your body is physical size and factors. On other hand, the movement of the air, whether it pulls, the pressure of the air, that's not what normally and plays in ventilation systems. The humidity, you know that in school air, feels very different. And the wall temperatures play a big role. You me key point, namely the wall temperature. Which role do they play for the space feeling? I have to talk about the classic technique of heat transfer. Heat transfer happens in different ways. On one hand, convection. That is what happens when the air gets and there is a heat current. You know especially from water, when warm sea currents flow from A to B and so on. Then is the heat line. You probably from cooking, when the pot lid gets hot or the spoon gets hot, which in a teapot. And then there's the heat radiation. And that's the principle that's here. Heat radiation doesn't need any material, no air, no solid material to transmit And that's what every body radiates and you through your skin. And that depends on whether your... the opposite object is than you or warmer than you. And if you are cold now, and you are warm, normal body temperature, then you a cold feeling. And if you the cold feeling, get cold. And is a very exciting phenomenon that many people underestimate. The air temperature is warm and your thermometer shows you your 20 or 21 degrees Celsius. But still it cold, because you get cold heat radiation from physicists would say, not because energy can from warm to cold. That means the walls are your body temperature from your heat radiation. And creates a phenomenon, when the room temperature has a certain temperature, you feel... different comfortable depending on how warm the walls are and that also ensures that you your heating behavior when you warm walls then people automatically less because they lower air temperature enough to feel comfortable and that is a very exciting point that has to with the walls and we know reba yes energetic renovation is very for the outer walls, because it the heating behavior and the comfortability. That sounds like the effect in old buildings is different than in new buildings. Yes, that's I found out in my old building that the walls always felt very cold. And when I'm at home... after 15 minutes I to a blanket. Although the heating is on power supply and my thermometer shows my 20 degrees, I get very cold Because if I really the wall everyone can test and see how cold the wall feels, I also that the the old building apartment were very cold. A point that is to closely, least in my perception, is the issue of humidity. I always of cold winds and maybe warm air that it or condensates or whatever. But where would you say is still moisture in everyday life in the living room? What role does this exchange of cold water play us right and warmer ambient air? The normal moisture aspects are common things like showering, washing in the kitchen, laundry, everything that somehow has with moisture and This will make the room air absorb moisture. When the walls are very cold, the moisture will on the surface. This happens when you shower in the mirror. When the mirror colder than the air temperature. Or you know this when the windows are And just like on the on the inner wall and the walls get damp from Is there an optimal humidity in the living room? Can you that? An optimal humidity is actually to the temperature. And now you get such small temperature measuring devices usually have a small smiley, which then exactly this this between these two sizes, which you in a smiley and then there's a smiling smiley, if the humidity to room temperature fits or not. That's I also ask, with humidity, think, I'm also influenced I'll always to mold. And then I also it to the air, and maybe the question is, how do I that right Exactly, that's exactly the point you're about. If the walls get too cold, Then you the humidity so much that it then offers nutrients for mold. And you correctly that what you should do is to the humidity out of the air. And that happens when you the air. Another point would actually the air, but as you said, when the heating is on impact ... If you the air, you can only exchange And that's why air-strikes, as the German says, are best way to quickly exchange the air and not it over a long period of So you don't lose heat that you pump into the room all time. So to it that permanent drop. is not a solution now? least not in winter, exactly. permanent tilting can be if it is warm enough It's really about if the temperature is between outside and inside, should definitely tilting, because this air exchange takes way too long and the wall temperatures, especially around the window area, get even colder and then even faster and even faster. So you really like a hamster. Okay, so we've about old building and new building. How does it when I need ventilate or how? It's actually exactly at this point that the humidity is In the new building, already have insulation on the walls from the outside. That means that the wall temperatures are usually much higher than in the old building. That makes you feel more comfortable On the humidity from the room air is much slower on the wall. That's why ventilation is not as necessary as in the old building, where you really, I know that too, wake and the glass is wet and you have to the window to the humidity. That's in the new building. And if you're talking about the new building, I'll houses for last ten years, they often already have ventilation systems. that will prevent you from the windows. To the moisture out of the air. It's about being I want to fresh air, as you know What the resident That it's not in the air, but that it's shimmering on the building material. The first test is the hand test. Touch your wall. to That that the walls are getting colder colder And then you can't make the air so warm that... the does not drop at That's a vicious circle, because not dampened walls also that the warm air is through the walls So, touch the walls and if you notice that the walls are cold, are measuring devices that measure the surface temperature. And if you notice that you have problems with mold, measure that And of course you have to the heating. I also I have friends who say they don't want to and want to the heating system. And whole apartment cools down 18-17 degrees. That's not good because you need a certain room temperature or air temperature to least save humidity in the air. We've about space climate, was our Do you have a building substance that would say is problematic? That's the solution to good room climate, under more difficult conditions. I can only say that the insulation, no how thick, helps to let heat into the walls. Of course, that from these thick old building walls, which 30 cm thick and so on. They also a bit of heat, but especially in winter, which is so long for that... It to much heat in the walls that the walls will all winter after So in itself it the insulation that you somehow have to the walls. Now there are also tools that you can use, like infrared heating or infrared heating panels, which, as I said, heat the room air, but take on objects, preferably the cold wall. Is that a solution or do I for it? This is certainly a short-term solution to counteract acute mold problems, in winter. mean, we had a very unexpectedly long winter where it was minus degrees for such situations. That can certainly be a solution, but a permanent solution to the wall temperatures is actually just to a insulation to the walls and really Always better from the than from the inside. insulation is very complex, so you to calculate that you don't just the shindle in house. Then we hold on. Inner insulation is definitely the best. that I would say thank you Florian for being and we will you next year. Thank you Olli, yes, see you then. A few words from me My name is Michael Suhr. am the founder and business manager of Reneva. We Reneva also know how complex energy repairs are today. 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