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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Sebastian7930 Aug 2016 11:29Just don’t expect too much from it – especially not from the mechanical ventilation system with heat recovery.
If the air quality didn’t worsen, I would even turn off the mechanical ventilation during the day in summer. At the moment, I have it set to run at the lowest level when no one is home.
If the air quality didn’t worsen, I would even turn off the mechanical ventilation during the day in summer. At the moment, I have it set to run at the lowest level when no one is home.
Yes – in winter you can electrically preheat the fresh air, but it doesn’t work the other way around. If I draw in 34 degrees Celsius (93°F) hot air, I distribute that heat throughout the house. The only option then is to turn it off. There was also a cooling version available, but it would have been expensive and only partially effective. They could have routed the supply air duct a few meters through the ground, but that wasn’t an option for us anyway, since we are installing both the heating system and the mechanical ventilation with heat recovery unit in the attic. Better to go for a proper air conditioning system — although that is not planned.
According to the datasheet, the main mechanical ventilation unit has a “night cooling” function, but no one has been able to clearly explain what that is or how it works.
According to the datasheet, the main mechanical ventilation unit has a “night cooling” function, but no one has been able to clearly explain what that is or how it works.
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Sebastian7930 Aug 2016 11:33Well, the heat exchanger also works in reverse.
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Sebastian7930 Aug 2016 11:41Yes, I meant it in relation to daytime air temperatures of 35 degrees Celsius (95 degrees Fahrenheit).
That's right. What would be the equivalent of heat recovery? Cold retention? I would assume the efficiency is also somewhere between the usual 70 to 90%, so it gradually gets warmer as well. But if you run the mechanical ventilation system at the lowest setting, hopefully that is enough to maintain comfortable temperatures until the next nighttime cooling.
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