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| EV-based road transportation is not viable |
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| nctnico:
--- Quote from: tggzzz on February 21, 2023, 06:12:50 pm --- --- Quote from: tom66 on February 21, 2023, 03:48:28 pm ---Good diagram. But, does it account for the difficulty in insulating UK homes to support heat pumps? Having embarked upon the process of insulating our 1930's detached home, it is definitely not a trivial process usually requiring bespoke techniques for each property. --- End quote --- And external insulation is very easy to get badly wrong, e.g. https://www.walesonline.co.uk/news/wales-news/victims-home-insulation-scandal-scandal-26076372.amp --- End quote --- One of my relatives is an advisor for people who seek to improve the insulation & lower the carbon footprint of their homes. His conclusion is that it is not worthwhile to re-insulate older homes because the basic structure doesn't allow for it. Better insulation also means adding air treatment to manage the moisture inside a home which means adding ducts and mechanical ventilation. So the only option is to use hybrid heaters (heatpump + boiler) in order to get enough heat into such homes. Heating is not just necessary to keep the people inside a home warm, but also to keep the home itself dry in order not to get problems with mold and wood rot. It is pretty complicated to get right from the start. Let alone trying to do a retrofit. |
| nctnico:
--- Quote from: Ice-Tea on February 21, 2023, 06:26:25 pm ---Look up "SCOP". --- End quote --- Did that. It is a meaningless number. Just like NEDC / WLTP for cars. It doesn't tell you anything about the actual performance. |
| Marco:
--- Quote from: tggzzz on February 21, 2023, 06:12:50 pm ---And external insulation is very easy to get badly wrong --- End quote --- Meh, moisture problems from barrier effects tend to be overblown. If they screw up badly enough blown rain can get behind the insulation it's because they are half assing it, not because it's difficult. The main problem with external insulation is that it's bloody expensive still. They need some kind of system which just 3D scans the external walls and gives the workmen a bunch of legoblocks to fill it with in a day. |
| Ice-Tea:
So, uhm, that's your argument then? You disregard any data that doesn't fit your narrative and call all those that run with it idiots? :o |
| nctnico:
--- Quote from: tszaboo on February 21, 2023, 06:26:09 pm ---Typical winter with this climate, the deltaT is 20-30, entirely possible to provide this even with air source heatpump. --- End quote --- It is not about the temperature delta, but the absolute temperature operating range of a heatpump! And at some point the outside unit will ice up preventing extracting heat from the environment. The graph you posted is way too optimistic. A heatpump simply does not work well in a climate that has close to or sub-zero temperatures. |
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