Domestic Hot Water (#DHW) periodic #pasteurisation of storage to prevent #Legionnaires' disease is hard to do with a heat pump (getting up to ~60C), so I do something a bit differerent:
https://www.earth.org.uk/eddi-diverter-dataset.html
When there is sufficient sunshine the system is set up to automagically do it a bit less than weekly by direct diversion from PV; in winter once or twice a month from the #grid when #carbonIntensity is low...
This makes interesting reading if you're considering adding a battery to your #SolarPV system. If we assume 1 kWh of #PV-generated electricity has a #CarbonIntensity of 35 gCO2, adding a battery increases this by 84 gCO2/kWh (less if only one inverter is needed).
https://doi.org/10.1016/j.jclepro.2022.132899
This brings the total to 120 gCO2/kWh, which is comparable to the current annual average for the NZ electricity network:
https://www.statista.com/statistics/1299734/new-zealand-emissions-intensity-from-electricity-generation/
(Although, as I type, it's 33 gCO2/kWh, thanks to 96% renewables!)
... 🧶
2 concepts:
“Reducing the #carbonIntensity of the economy. In practical terms, this is what we're doing with renewables. Because there's a need for back-up, because they're not completely decarbonized either, because they power an economy that in its very materiality (steel, cement, plastic) will depend on carbon for a long time to come: an electric car, for example, is obviously not decarbonized, even if it reduces the carbon intensity of transport. This is obvious. Why do we have to make it clear? Because it forces us to leave the question of the size of the #economy on the table.
“#Degrowth, the dismantling of certain hopes, projects, technical devices. There are things that we're going to have to reduce or even abandon, and organize that. And once we've said that, the question of distribution reappears. If we can't imagine a world where everything will grow without environmental problems, the question of inequality will come back with a vengeance.”
Dans son nouvel ouvrage, Sans transition : une nouvelle histoire de l’énergie, l’historien Jean-Baptiste Fressoz démontre à quel point les discours contemporains sur la «transition énergétique» sont nourris de récits historiques frauduleux sur de supposées transitions passées, préservant au passage les intérêts des multinationales du secteur. En mettant au jour l’empilement des sources d’énergie dans l’histoire (nous ne sommes jamais sortis de «l’âge du charbon» !), leurs interdépendances (ou symbioses), et la fabrique des récits de la transition, il nous invite à nous débarrasser d’un concept inopérant, qui empêche de se poser les bonnes questions.
I try to be an optimist and also am guilty of posting more positive than negative.
For all of my praise of our Midwest grid’s renewable commitments, it all falls apart on yucky hot days. We must do better 😭
86% fossil fuel, and it’s only 9:30 AM and 85°F.
#SouthwestPowerPool #CarbonIntensity #fossilfuels #renewables
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