I can remember 30 years ago receiving samples of the latest, greatest phase-change material. As I recall, it was a eutectic salt product that came packaged in sealed, black cans, ready for installation in passive solar buildings. While a great idea, these products were expensive and didn’t hold up well. Phase Change Energy Solutions appears to be changing those equations with its biobased, biodegradable BioPCM mats.
Phase-change materials (PCMs) use a quirk of physics to aid in thermal storage. When you warm up a solid material (like ice), its temperature rises steadily until it nears the melting point. At that point, the temperature remains roughly the same as the material continues to absorb heat; the process of
changing phase from solid to liquid absorbs a lot of energy, called latent heat. Once the material is entirely melted, its temperature resumes rising. When you cool down and freeze a liquid, the same process happens in reverse, releasing stored energy.
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