ᐅ Why is shading especially important in newly constructed houses?
Created on: 29 Aug 2016 13:33
G
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.
During the GDR era, there was a saying about the watches produced there at the time:
"Ruhla watches are waterproof. Water gets in, but it doesn’t come out."
(which, I believe, was somewhat unfair to the quality of the watches)
This can now be nicely applied to newly built houses.
In times of energy saving, it is desired (especially in winter) to use solar radiation through the windows to help keep rooms warm. The heat (from the sun as well as from heating) should not be lost quickly. Walls are designed with this in mind. As little heat as possible should be lost uncontrollably. Of course, walls also keep heat out for a longer time—but not permanently. This means that once the house is heated up, it becomes difficult to cool it down again.
The only solution then is to ventilate by opening windows at night. This works well on upper floors, where windows are less accessible. It is problematic on the ground floor because the risk of burglary could increase.
Therefore, preventive measures such as shading are reasonable.
"Ruhla watches are waterproof. Water gets in, but it doesn’t come out."
(which, I believe, was somewhat unfair to the quality of the watches)
This can now be nicely applied to newly built houses.
In times of energy saving, it is desired (especially in winter) to use solar radiation through the windows to help keep rooms warm. The heat (from the sun as well as from heating) should not be lost quickly. Walls are designed with this in mind. As little heat as possible should be lost uncontrollably. Of course, walls also keep heat out for a longer time—but not permanently. This means that once the house is heated up, it becomes difficult to cool it down again.
The only solution then is to ventilate by opening windows at night. This works well on upper floors, where windows are less accessible. It is problematic on the ground floor because the risk of burglary could increase.
Therefore, preventive measures such as shading are reasonable.
And now the problem with new houses.
Experienced this on Friday. Outside it was 34°C (93°F), inside 23°C (73°F). Baked a cake because guests were coming, so the kitchen was nicely warm. Then 10 people sat in the living room who had already brought a lot of heat with them.
And suddenly, at 5 p.m., the living room temperature was 27–28°C (81–82°F), despite continuous shading from closed roller shutters.
So then the thought comes up to retrofit an air conditioner, but everyone forgets that they consume electricity—and not just a little.
Next time we’ll grill outside, in the garage, which faces north and hopefully stays cooler.
Experienced this on Friday. Outside it was 34°C (93°F), inside 23°C (73°F). Baked a cake because guests were coming, so the kitchen was nicely warm. Then 10 people sat in the living room who had already brought a lot of heat with them.
And suddenly, at 5 p.m., the living room temperature was 27–28°C (81–82°F), despite continuous shading from closed roller shutters.
So then the thought comes up to retrofit an air conditioner, but everyone forgets that they consume electricity—and not just a little.
Next time we’ll grill outside, in the garage, which faces north and hopefully stays cooler.
I still don’t quite understand. An older building should heat up much faster and could easily reach 35°C (95°F), for example. So why is shading more important in a new build than in an older building?
Is it really the case that, despite better U-values, the windows don’t block radiation any better, and that the larger window area compared to an older building causes more heating?
Is it really the case that, despite better U-values, the windows don’t block radiation any better, and that the larger window area compared to an older building causes more heating?
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Peanuts7429 Aug 2016 19:06BeHaElJa schrieb:
The detached older single-family house is unbearably hot... (unless it has thermal mass, trees, or few windows) like the old church... which simply has tons of mass. The townhouse only has windows on two sides... often an avenue of trees in front.??? Huh, why does a townhouse only have two sides???
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