Hello,
we have triple-glazed windows, with external venetian blinds (raffstores) on the south side and roller shutters everywhere else.
Assuming the sun is shining strongly from the south, the temperature on the north side is 36°C (97°F), and the indoor temperature is 24°C (75°F).
Does it make a difference for how long it takes for heat from the north side to enter the house depending on whether the roller shutters are fully open or closed?
Would it make a difference if roller shutters or external venetian blinds (raffstores) are installed there?
In winter, the slat position of the external venetian blinds (raffstores) should help to allow more solar energy into the room.
How should the slats be positioned to maximize solar heat gain?
Or is it always best for solar gain if the external venetian blinds (raffstores) are fully raised?
Best regards
we have triple-glazed windows, with external venetian blinds (raffstores) on the south side and roller shutters everywhere else.
Assuming the sun is shining strongly from the south, the temperature on the north side is 36°C (97°F), and the indoor temperature is 24°C (75°F).
Does it make a difference for how long it takes for heat from the north side to enter the house depending on whether the roller shutters are fully open or closed?
Would it make a difference if roller shutters or external venetian blinds (raffstores) are installed there?
In winter, the slat position of the external venetian blinds (raffstores) should help to allow more solar energy into the room.
How should the slats be positioned to maximize solar heat gain?
Or is it always best for solar gain if the external venetian blinds (raffstores) are fully raised?
Best regards
In summer, the sun is almost directly overhead when it is in the south. That is why external venetian blinds are very effective. Although I don’t have any myself, I imagine that a slight downward tilt is enough to block the direct sunlight while still allowing light into the rooms.
M
motorradsilke23 Nov 2024 09:05BoPaDi24 schrieb:
Thank you all for the feedback.
Our house is already finished, and we have external venetian blinds (Raffstores) on the south and west sides, and roller shutters all around on the east and north sides.
We only moved in a few weeks ago, so I don’t have any experience yet.
However, I’m concerned that if I don’t manage the shading properly in summer, the heat will build up inside the house and then be difficult to get out.
As far as I understand, insulation helps slow down how fast the house heats up, but it also means the house cools down more slowly once the heat is inside.
And since our master bedroom is on the north side, that would be a bit problematic.
Honestly, I’m surprised that shading is sufficient just by angling the slats horizontally. I would have bet that you need to close them completely in summer. I even thought that horizontal slats would intensify the sun and should therefore be used mainly in winter.
We were told that external venetian blinds help save heating costs. But if fully raised is best in winter, then that advice must have been wrong. You can only find out what works best for you through trial and error. Every house is different, and every person is different.
We don’t have external venetian blinds; on nice days, many of our windows and doors are open, including the entire south side. But we never sit inside, rather outside. In the evening, we create a strong cross breeze for ventilation. The door to the master bedroom in the northeast stays closed even during the day.
This approach has worked very well for us for the past three years.
D
derdietmar23 Nov 2024 10:20Hello,
the louver angle depends on the season and also on the time of day. You can calculate the exact sun angles online using sun position simulators (azimuth and elevation) if you want to be very precise. Depending on how your venetian blinds are controlled, it is best to automate this as much as possible. If control is only possible via push buttons, it is usually enough to tilt them to about 55-60% when facing south. The west side is more challenging because the sun is at all heights there. In the evening, the blinds usually need to be almost fully tilted to prevent sunlight from entering the house (assuming a clear view of the sun).
Basically, your house will still get warm in the summer at some point; insulation only delays this. In the evening, it is just necessary to ventilate thoroughly.
Best regards
the louver angle depends on the season and also on the time of day. You can calculate the exact sun angles online using sun position simulators (azimuth and elevation) if you want to be very precise. Depending on how your venetian blinds are controlled, it is best to automate this as much as possible. If control is only possible via push buttons, it is usually enough to tilt them to about 55-60% when facing south. The west side is more challenging because the sun is at all heights there. In the evening, the blinds usually need to be almost fully tilted to prevent sunlight from entering the house (assuming a clear view of the sun).
Basically, your house will still get warm in the summer at some point; insulation only delays this. In the evening, it is just necessary to ventilate thoroughly.
Best regards
D
derdietmar23 Nov 2024 10:54Hello,
solar gain in winter helps save heating costs, so using external blinds can indeed be economical. During the heating season, they should be adjusted to allow sunlight to enter the house or be fully opened. Even when positioned horizontally, at least part of the energy is still reflected into the room. A roller shutter, on the other hand, blocks out the sun completely.
Best regards
solar gain in winter helps save heating costs, so using external blinds can indeed be economical. During the heating season, they should be adjusted to allow sunlight to enter the house or be fully opened. Even when positioned horizontally, at least part of the energy is still reflected into the room. A roller shutter, on the other hand, blocks out the sun completely.
Best regards
R
RotorMotor23 Nov 2024 10:55Yes, that’s nonsense!
They do not insulate at all and only reduce solar gains.
With roller shutters, it might be that when closed, they provide a slight insulating effect.
They do not insulate at all and only reduce solar gains.
With roller shutters, it might be that when closed, they provide a slight insulating effect.
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