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Living in London and Dublin, what I've observed is that we get the following contradictory statements: - "We don't need AC, It's only hot a few times during th
by alexhans 3mo ago
Living in London and Dublin, what I've observed is that we get the following contradictory statements:
- "We don't need AC, It's only hot a few times during the year."
- "Oh what a terrible heat, global warming is getting worse every year."
Pair to that the fact that in many places windows don't open all the way due to bureocratic regulations and many interior designs are very questionable in terms of air flow and you get some unpleasant scenarios.
- Gigachad 3mo agoFor the wind out ones with the chain at the bottom, you can open up the box and remove the limiter that stops it opening all the way. They make the same opener for ground level and highrises with just a limiter keeping it mostly closed when installed high up.
- thayne 3mo agoIt seems like a bidirectional heat pump would be a good solution, since the same device can be used to heat the building when it's cold. And a lot of europe (including the mentioned UK and Greece) don't often get cold enough that a heat pump is inefficient.
- deleted 3mo ago[deleted]
- msh 3mo agoThe uk gets cold enough that a air to water heatpump is a better heating solution.
- fancyfredbot 3mo agoAir to water heat pumps are typically less efficient than air to air. Both will work in cold UK temperatures. However the water is often heated to a higher temperature which can reduce efficiency.
- msh 3mo agoThat seems to not hold up when checking. Fx according to https://daikinquebec.net/en/heat-pump/air-vs-water-vs-geothermal/ https://daikinquebec.net/en/heat-pump/air-vs-water-vs-geothe... Air2air have a cop of 2.5 - 3.2 while air2water it’s 3.0 to 3.5
- roryirvine 3mo agoThe main benefit is that air to water systems are compatible with existing central heating systems - but only if the radiators are sized correctly, and often they're not. If you factor in the need to replace radiators etc, then the ability to act as an air con probably makes air to air the better choice. Now that the Boiler Upgrade Scheme grants cover air to air as well as air to water, I'd expect them to become much more common in the UK than they have been until now.
- fancyfredbot 3mo agoThe top end of the range they've shown here for A2W will assume you only heat the water to a very low temperature, and have a huge underfloor radiator. If you do that, and you only heat the water to 35C, A2W can be more efficient. Most UK houses have radiators and not underfloor heating and so cannot operate in that way without a hugely expensive retrofit of underfloor heating. It's typical to heat the water to over 50C if you want to reuse installed radiators. In this configuration the A2W pump is less efficient than A2A. Worth noting these numbers are low. Latest A2A pumps can have COP of up to 4, but an A2W can achieve 4.5 if you keep water temps very low.
- thayne 3mo agoIt isn't as effective, but air to water can be bidirectional. Probably good enough for a couple of times a year or so when there is a heat wave.
- ffsm8 3mo agoNorthern Europe will actually get colder with global warming... Well, only on average, the heat waves in the summer will stay. But it's always funny how many people don't really realize how soon the AMOC will likely collapse (probably within the next 30 years - definitely within the next 70 years) and just unlivable most houses will consequently become, as what we currently consider an extreme winter would consequently become a mild one... The infrastructure just hasn't been built for -20°C
- jjmarr 3mo agoThe Day After Tomorrow (2004) predicted this.
- ffsm8 3mo agoIt's not a good movie though, the entertainment value may be debatable - but it did not give a realistic scenario to the AMOC collapse. It's only slightly related insofar an amoc collapse would make winters in Europe more severe (not in USA) - but it's only "inspired by" such a scenario and should not be seen as a plausible future prediction
- hyperman1 3mo agoOne part of this is how hard it is to translate the impact to now-scientists. E.g. 2 degrees temperature raise did not sound bad to me, untill someone explained to me this is from ground to space, and the actual raise is double or triple that. Then we looked on a map and found current day Morocco seems close to what my Belgium is expected to become in that scenario. I still am not capable of deciding how realistic this is. So you made me surf to amocscenarios.org, and even if this thing is reliable, it still is hard to interprete. My winter goes from -5 every decade to -18. I've never had either in my life. What does this even mean? Can my ww2 rebuilt house deal with -5, as it supposedly already did? What to do forcdealing with -18? And that's the opinion of someone knowing a little bit. Now go to someone who has to managed 10 of life's disasters over his lifetime and explain how bad this really is.
- manmal 3mo agoTIL there will be 35 degrees Celsius in London today. I thought that basically never happens. I remember people telling me a few years ago that they are lucky to ever get 30 degrees.
- vanviegen 3mo agoWell yeah, it takes time to adjust to new circumstances. Especially since weather events don't come with any documentation saying things like "this will happen every two years now".
- alexhans 3mo agoI'd argue that these temperatures are not a new thing. It's just a contradiction that is almost a tradition at this point, imho.