this post was submitted on 03 Jul 2024
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Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.

As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world. About 1C of total warming. Second chart: about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability. Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases. About 0.5C of cooling with large error bars from SO2.

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The hunt for the most efficient heat pump in the world (arstechnica.com)
submitted 2 months ago by [email protected] to c/[email protected]
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A new generation of engineers has realized they can push heat pumps to the limit.

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[–] [email protected] 1 points 2 months ago (1 children)

I don't rember the details of how it works. I think it just reduces the torque or something? Maybe it doesn't work on newer pumps or they already do it.

[–] [email protected] 4 points 2 months ago (1 children)

Oh I think I know what you're talking about, abusing a minisplit by idling the inverter back too far. Effectively you have a hugely oversized condenser for the tiny flow, under the right conditions like a cool night you can get ridiculous subcooling.

But COP is irrelevant in this case because you've derated the actual BTU to near zero, you aren't moving any refrigerant.

Also yes this will kill your compressor because the minimum speed is set where it will get enough oil flow. Run it too slow, and it won't pick up oil and eventually seize up. You also could end up running the suction in vacuum which is also hard on compressors.

[–] [email protected] 2 points 2 months ago* (last edited 2 months ago)

Thats it thank you.