441–450 of 505 posts
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The process of moving heat from your house outside also creates excess heat, because no AC system is completely efficient (and it can't be because of the second law of thermodynamics).
Heat pumps have efficiency 300-400% at the moment, meaning they pump out MUCH more than they generate .
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I’m not debating that the sun is stronger heating source. I’m just saying air-conditioning increases climate change because it uses fossil fuels and also the law of thermodynamics dictates that he will be created in this instance.
Air conditioners don't need to use fossil fuels. Solar power and AC work really well together because peak solar energy is exactly when you need AC the most. No heat is created either, that would explicitly violate the first law of thermodynamics. An air conditioner powered by solar energy (or anything solar powered) ends up releasing the exact same amount of "excess" heat as the sunlight would have if it hadn't been…
But they do. And do we build the AC with solar power as well? Ship the parts around the world on sail boats?
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>> Double glazing is very expensive but no one in Europe would go without it. This isn’t true. I’ve lived in 3 places in London with single glazing. They’re surprisingly common. All new properties come with it but the majority of our housing stock is old. There’s also little comparison between air con and double glazing. One will be helpful for 4-6 months of the year and reduce my energy bills. The other will be nece…
Unless the aircon is a heat pump, in which case it’s also useful in the winter, it’s more efficient and carbon neutral if your electricity grid is decarbonised. If most people can’t afford a heat pump, why do we entertain the idea of making them pay an order of magnitude more to better insulate their home, which doesn’t even work in the end? You’ve been misinformed by European media. Please do your research, it’s all…
The talk of double glazing is funny to me, this was becoming a standard like 20 years ago where I live. Nowadays new construction does triple, with some special insulating gas between the panes. Single pane windows do not exist anymore.
No wonder you feel you need AC if you build single pane window, carboard wall homes.
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I've always assumed there is some sort of "acclimation" period, maybe even related to the conditions you grew up in. I much would rather spend a time outside in -40c (with proper outerwear) than 40c. I'm relatively healthy but I feel like my body shuts down at anything above 36c
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The process of moving heat from your house outside also creates excess heat, because no AC system is completely efficient (and it can't be because of the second law of thermodynamics).
Heat pumps have efficiency 300-400% at the moment, meaning they pump out MUCH more than they generate .
Sadly can't edit the original comment anymore.
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> hot weather has happened before Obviously, which is why it is called climate change. It doesn't mean "there were no hot day ever before", it means "there will be way more hotter days, and on average they will be significantly hotter". Pick up any recent newspaper and look at the number of "hottest month X in recorded history" articles, or "once-a-decade heat waves happening 4 years in a row" ones. That's climate ch…
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> you just need to let people use AC properly (..) every person in southern Europe should have an AC unit in their bedroom and deaths will go down substantially. Yes, exactly: install AC where it truly helps and where it is truly needed. That's the point I was trying to make. Most of the rest is solved far more efficient by things like installing shades. In other words: don't go all-out on giant whole-home AC without…
I get rage when I hear those "5 clever tips to stay cool without A/C". Many buildings already have shades, but please tell me more how those shades and "properly ventilating during the night" (aka not getting sleep half the night due to outside noise) will keep my apartment at a livable temperature when the air temperature outside never drops below 23 degrees for more than an hour. You can't effectively remove the he…
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Heat pumps have efficiency 300-400% at the moment, meaning they pump out MUCH more than they generate .
That is some Trump math. How can you be more than 100% efficient?
Heat pump uses electricity. It does, however, transfer more energy than it's using.
Magic of science! That page should be simple enough for the start: https://qualityhomeaircare.com/heat-pump-efficiency/
> Heat pumps convert energy to heat more efficiently than combustion-based systems, potentially delivering 300-400% efficiency compared to the 80-98% efficiency of the best furnaces and boilers.
> This fundamental advantage stems from the fact that heat pumps move heat rather than generate it through combustion or resistance.
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Is it that hard to drill an 8cm hole to run some refrigerant pipes through the wall?
Yes! Most of Europe has a "registered building" system, where buildings above a certain age are considered historic. Renovating those buildings is an extremely difficult, expensive, and bureaucratic process. You generally need to preserve the period-appropriate look and materials. An AC unit sticking out of a wall won't pass muster. Even newer buildings are problematic. an acquaintance of mine lives in an upper-middl…
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Is it that hard to drill an 8cm hole to run some refrigerant pipes through the wall?
If you rent the place and your landlord doesn’t want it you’re out of luck. If you own the place and your neighbors don’t like the noise of your AC you’re out of luck too. If your building is one of the many buildings protected for historic reasons only God can help you.