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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Carlos E.R." Newsgroups: sci.electronics.design Subject: Re: The Physics Behind the Spanish Blackout Date: Fri, 13 Jun 2025 22:46:30 +0200 Lines: 34 Message-ID: <6afuhlx9og.ln2@Telcontar.valinor> References: <1026c1c$fci3$1@dont-email.me> <1027bpv$mvq1$1@dont-email.me> <1027e64$nfnr$2@dont-email.me> <1rdokas.pew8b1jlata8N%liz@poppyrecords.invalid.invalid> <1028rpt$14rjn$3@dont-email.me> <1rdplb0.k2p5xu1t16jy8N%liz@poppyrecords.invalid.invalid> <102cuma$1umr0$1@paganini.bofh.team> <1rdt563.34jdntp3ft22N%liz@poppyrecords.invalid.invalid> <102e30t$2ish9$1@dont-email.me> <1rdt9mh.yzcwth1j2rwhuN%liz@poppyrecords.invalid.invalid> <102efp9$2lnkd$1@dont-email.me> <102fqai$305sp$2@dont-email.me> <102fstc$30obc$2@dont-email.me> <102fur4$31bas$1@dont-email.me> <102gllm$3aa86$1@dont-email.me> <102gqcj$3bh6j$1@dont-email.me> <102gvf9$3cqbf$1@dont-email.me> <1rdvd9y.1bavflpxcqkvvN%liz@poppyrecords.invalid.invalid> <102hg08$3gsjm$2@dont-email.me> <1rdvl1m.irus891ohv1mrN%liz@poppyrecords.invalid.invalid> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net wE8BYdiwsbT0jhUTMo58rAcI/5UDGVHp4evw4z4LvgIEdLeR6y X-Orig-Path: Telcontar.valinor!not-for-mail Cancel-Lock: sha1:g06lq3qwhNz0w0gVZzdtxJONigw= sha256:sp8Deu428RpCH1v+jRPWmuiTupRFzaZp9gCrGMFZepY= User-Agent: Mozilla Thunderbird Content-Language: es-ES, en-CA In-Reply-To: <1rdvl1m.irus891ohv1mrN%liz@poppyrecords.invalid.invalid> On 2025-06-13 17:46, Liz Tuddenham wrote: > Bill Sloman wrote: >> On 13/06/2025 11:02 pm, Liz Tuddenham wrote: >>> Don Y 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.