I read through the phase change material (PCM) article. I think I'm going to to set-up a precise measurement/logging system over the summer. Then this winter gather the data to calculate the kWh of storage in my sandbed. I also want to experiment with how low a water temperature I can use.
Oddly enough my battery storage is about the same as the the one in the article.
I wish it stated how much PCM was used. I wonder if my larger quantity of sand makes up for the efficiency loss of using a PCM?
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