Giant 'sand battery' holds a week's heat for a whole town

Re:Giant 'sand battery' holds a week's heat for a whole town by AnthonyMouse on Thursday March 14, 2024 @04:35AM (#39701601)

Doesn't this suffer the problem that you're then putting heat into the device, which is in your house, during the warm season when you want your house to stay cool?

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Re:Giant 'sand battery' holds a week's heat for a whole town by defrost on Thursday March 14, 2024 @04:46AM (#39701644)

Think of the water tank as being in but insulated from the house.

In the hot summer the hot air within the house is cooled by heat pumping the heat into the water tank which is slowly over weeks bought up from cold to mean summer tempreture.

In the winter the heat is extracted from the water and transfered to the house.

The house and the water mass are out of phase by six months.

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Re:Giant 'sand battery' holds a week's heat for a whole town by mythhabit on Thursday March 14, 2024 @04:52AM (#39701672)

It's a large enough volume of water, that adding insulation is feasible.

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Re:Giant 'sand battery' holds a week's heat for a whole town by AnthonyMouse on Thursday March 14, 2024 @05:08AM (#39701752)

But then why put it in the house and not e.g. in the ground?

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Re:Giant 'sand battery' holds a week's heat for a whole town by mkesper on Thursday March 14, 2024 @09:10AM (#39703518)

1. Not possible everywhere 2. Probably more expensive

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