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It would have been interesting to also estimate how much CO2 would be reduced if instead of a glass roof they used a normal properly insulated roof. So we can s
by empiricus 5y ago
It would have been interesting to also estimate how much CO2 would be reduced if instead of a glass roof they used a normal properly insulated roof. So we can see what is the CO2 cost of a stylish glass roof.
Note: I suggest using underfloor heating, it should be more efficient with a glass roof, because there is less hot air to raise to the top of the house.
- onion2k 5y agoIt would have been interesting to also estimate how much CO2 would be reduced if instead of a glass roof they used a normal properly insulated roof. Buildings like this in Paris are often so tightly packed together that windows in walls barely provide any light. Replacing the roof with a more standard one would necessitate giving up any daylight and having lights on all the time.
- cbg0 5y agoWhy would there be less hot air if you set the same indoor temperature? Hot air will rise no matter what.
- empiricus 5y agoThe interesting part of underfloor heating is that it is not the hot air that warms the room. It is the radiation from the floor. Smth like 10w/C/m2. And the heat profile in the room looks much better. For example https://www.researchgate.net/figure/An-example-of-vertical-temperature-distribution-for-underfloor-heating-and-for-radiator_fig2_241169861 https://www.researchgate.net/figure/An-example-of-vertical-t...
- cbg0 5y agoWell, the infrared heating warms the air which warms the room if you want to be pedantic. Unless you're losing heat through the floor I doubt that temperature difference between the floor and ceiling is accurate with a radiator system, perhaps if you measure it 30 minutes after you turn on the heat, but throughout the day the temperature should be mostly consistent throughout the room unless you're losing heat through the floor.
- empiricus 5y agoI think the air is almost transparent to infrared. The underfloor heating uses a low temperature; the floor is ~24 C. There is little air movement because there is a very small temp gradient. With a radiator or a stove, its temperature is much higher, prob > 60 C. So you will have a column of hot air that rises to the top of the room and stays there. And at the floor level it is much colder.