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To quote, your comment's ideas are bad and ignorant. Not because they are incorrect, but because you blindly insist on them. The reasoning is valid merely for a rock/concrete oven or a vacation house. I suggest you read up on laws of conservation. If you want to be less than 100% efficient, you have to lose energy somehow, somewhere. I don't know where you're getting efficiency numbers from, but quoting from your reference, storage in Sorø will double as electricity storage while beating your numbers on electricity alone. "A similar system is scheduled for Sorø, Denmark, with 41–58% of the stored 18 MWh heat returned for the town's district heating, and 30–41% returned as electricity." BTW, when you switch rocks for concrete, of course it's expensive and makes no sense - people don't add tons of concrete for thermal storage. Though they do use it, if it's there, and add rocks, brick walls, water tanks, phase change materials etc, if they want more. |