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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Peanuts7429 Aug 2016 14:57Knallkörper schrieb:
Steffen has it all covered.
As others have mentioned, the U-value is not decisive for solar gains. The U-value only relates to thermal conductivity: it’s a good measure of how much energy flows when there are different temperatures on each side. Radiation is not accounted for.
Additionally, modern houses typically have (first) larger windows and (second) less massive masonry that stores heat. Key term: phase shift.
We are installing an air conditioning unit in the attic to cool the children’s rooms and the bedroom. It’s not very expensive, maybe around 3,500 euros.Exactly, but only for itself.
One should also consider that once the sand-lime brick warms up, it stores a lot of energy, meaning it's harder to release heat overnight...
Shading is absolutely essential for us, with about 12m² (130 square feet) of window area in the living-dining area, most of it facing south.
Hello,
wow..
Really "only" 3,500 Euro? How exactly does that work? Are there ventilation ducts coming out of the upper floor ceiling, similar to a mechanical ventilation system with heat recovery?
What is the power rating of such an air conditioning system? In other words, how much electricity does it consume?
We are slowly nearing the finish line here, the screed is currently drying, but maybe one would want to retrofit something like that someday... Our attic is empty and unused...
Best regards,
Andreas
wow..
Knallkörper schrieb:
We are installing an air conditioning unit in the attic that cools the children's rooms and the bedroom. It doesn’t cost a fortune, maybe 3,500 Euro.
Really "only" 3,500 Euro? How exactly does that work? Are there ventilation ducts coming out of the upper floor ceiling, similar to a mechanical ventilation system with heat recovery?
What is the power rating of such an air conditioning system? In other words, how much electricity does it consume?
We are slowly nearing the finish line here, the screed is currently drying, but maybe one would want to retrofit something like that someday... Our attic is empty and unused...
Best regards,
Andreas
S
Sebastian7929 Aug 2016 15:21Sounds like a ceiling unit – in that case, the doors need to remain open.
In our house, there will be individual units in the upper bedrooms/living room that operate independently of each other. The refrigerant lines all run up to the attic, where they are bundled together to connect to the outdoor unit on the roof.
However, for your setup, a simple solution would already be too late because the condensate drain, power supply, and refrigerant lines would need to run flush inside the rooms – and of course be airtight sealed at the collar beam layer.
All units cost me just under 4000 euros, plus the few lines, which were less than 400 euros. I installed built-in wall boxes right away, where everything is already laid and can be easily retrofitted later.
The money is already gone.
In our house, there will be individual units in the upper bedrooms/living room that operate independently of each other. The refrigerant lines all run up to the attic, where they are bundled together to connect to the outdoor unit on the roof.
However, for your setup, a simple solution would already be too late because the condensate drain, power supply, and refrigerant lines would need to run flush inside the rooms – and of course be airtight sealed at the collar beam layer.
All units cost me just under 4000 euros, plus the few lines, which were less than 400 euros. I installed built-in wall boxes right away, where everything is already laid and can be easily retrofitted later.
The money is already gone.
D
daniels8729 Aug 2016 15:22I was actually surprised at how cool the house has been in the past few days. Even though there is no shading yet, and the insulation on the upper floor ceiling is still missing.
But this summer is a joke anyway.
But this summer is a joke anyway.
S
Sebastian7929 Aug 2016 15:23You have fresh interior plaster, right? Just wait – it will warm up soon. Thanks to all the construction moisture, it still feels cool now – I used to have the same misconception.
D
daniels8729 Aug 2016 15:27Ah, okay – that would be too good to be true.