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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: The Physics Behind the Spanish Blackout
Date: Fri, 13 Jun 2025 22:46:30 +0200
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On 2025-06-13 17:46, Liz Tuddenham wrote:
> Bill Sloman <bill.sloman@ieee.org> wrote:
>> On 13/06/2025 11:02 pm, Liz Tuddenham wrote:
>>> Don Y <blockedofcourse@foo.invalid> wrote:

....

>>> Is there any way you could 'store cold' rather than electricity?  Use a
>>> solar-powered heat pump during the hours of sunshine to cool a large
>>> tank of water, then reverse the the pump , which could be powered by a
>>> relatively small battery and inverter, to run water-cooled air
>>> conditioning during darkness.  (A DC powered electric motor on the heat
>>> pump might be even more efficient - just remember to replace the brushes
>>> regularly.)
>>>
>>> That way you could take your biggest load off-grid entirely.
>>
>> Why bother? Storing the power in a "power wall" style battery does
>> exactly the same job, with fewer intermediate stages to waste power
>> along the way.
> 
> The storage of energy (in this case below ambient) in a tank of water is
> a lot less environmentally damaging than batteries of any kind and
> water-cooled air conditioning is more efficient than air-cooled.

Needs a large water tank, and not a large temperature drop. Maybe 
converting the water to ice? That stores a lot of "energy" per kilogram.

If you have the space, why not?

The thing is that storing cold during the night could also be interesting.

-- 
Cheers, Carlos.