ᐅ Why is shading especially important in newly constructed houses?
Created on: 29 Aug 2016 13:33
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Grym
It is often argued that shading is especially important in new builds to prevent overheating in summer. But why is that exactly?
The insulation in a new building works both ways. Whether it’s cold or heat, the house takes much longer to adopt the outside temperature compared to an older house with poorer insulation.
Now, regarding the windows themselves. Shouldn’t solar energy pass through a less effective double-glazed window faster than through a modern triple-glazed window?
Why do many say that shading is PARTICULARLY important in new builds during summer? I would rather think the opposite: a new build is better insulated against heat from outside. Triple-glazed windows with a low U-value keep heat out better than old double-glazed windows.
The insulation in a new building works both ways. Whether it’s cold or heat, the house takes much longer to adopt the outside temperature compared to an older house with poorer insulation.
Now, regarding the windows themselves. Shouldn’t solar energy pass through a less effective double-glazed window faster than through a modern triple-glazed window?
Why do many say that shading is PARTICULARLY important in new builds during summer? I would rather think the opposite: a new build is better insulated against heat from outside. Triple-glazed windows with a low U-value keep heat out better than old double-glazed windows.
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Sebastian7929 Aug 2016 14:17That's how I did it too – but for me, the children don’t have to sweat, and my office is in the basement, where you don’t sweat anyway.
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Peanuts7429 Aug 2016 14:26I also find it somewhat selfish to cool the master bedroom while letting the children’s rooms, where a computer or other equipment might still be running, heat up. Always prioritizing the little ones
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Knallkörper29 Aug 2016 14:28Steffen has included everything necessary.
As others have mentioned, the U-value is not decisive for solar heat gain. The U-value only relates to thermal conductivity: it provides a good estimate of how much energy transfers when there is a temperature difference between two sides. Radiation is not accounted for in this.
Furthermore, modern houses typically have (firstly) larger windows and (secondly) less massive masonry that stores heat. Key term: thermal lag.
We are installing an air conditioning unit in the attic to cool the children’s rooms and the bedroom. It doesn’t cost much, maybe around 3,500 euros.
As others have mentioned, the U-value is not decisive for solar heat gain. The U-value only relates to thermal conductivity: it provides a good estimate of how much energy transfers when there is a temperature difference between two sides. Radiation is not accounted for in this.
Furthermore, modern houses typically have (firstly) larger windows and (secondly) less massive masonry that stores heat. Key term: thermal lag.
We are installing an air conditioning unit in the attic to cool the children’s rooms and the bedroom. It doesn’t cost much, maybe around 3,500 euros.
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Doc.Schnaggls29 Aug 2016 14:28Another argument is certainly that new buildings usually have significantly more window area compared to "older" buildings.
As a result, without shading, considerably more heat naturally enters the building through the windows...
As a result, without shading, considerably more heat naturally enters the building through the windows...
Sebastian79 schrieb:
Everyone with new builds is experiencing this right now... if you didn’t lower your roller shutters, you’re basically overheating...Hello,
that’s nonsense! It depends on all the parameters: window area, building orientation, room layout, eaves, etc.
We are building without those ugly standard roller shutters because other factors have been taken into account!
(building orientation, substantial calcium silicate masonry, roof overhangs, room layouts, and the use of sliding louvers)
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Sebastian7929 Aug 2016 14:47No, it’s not nonsense – this applies to almost every house, because the vast majority have openings facing west or south, and then it gets hot. Or is your house only facing north and invisible from the other sides?
And don’t take the word “roller shutter” too literally; just replace it with “external shading element.”
The details certainly matter to some extent, but in the end, that probably makes about half a degree difference.
By the way, I also only have calcium silicate blocks, I paid a lot of attention to summer thermal protection on the roof, have roof overhangs, and there are no glass facades on the west or south sides.
Oh, and ugly external shading elements on the upper floor – really terrible.
And yet, it still gets warm inside.
And don’t take the word “roller shutter” too literally; just replace it with “external shading element.”
The details certainly matter to some extent, but in the end, that probably makes about half a degree difference.
By the way, I also only have calcium silicate blocks, I paid a lot of attention to summer thermal protection on the roof, have roof overhangs, and there are no glass facades on the west or south sides.
Oh, and ugly external shading elements on the upper floor – really terrible.
And yet, it still gets warm inside.
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