Thermal cyclability

In order to be effective, phase-change materials (PCMs) need to be able to cycle back and forth between the solid and liquid phases. Thus, they can store heat and recharge daily for the lifetime of the building material. However, inorganic PCMs have a tendency to supercool, staying liquid even if temperatures drop far below the phase transition temperature.

CoolComposites has developed a method to manufacture CoolFlux such that each microparticle includes a nucleator. The nucleator remains solid while the rest of the microparticle melts, and templates the solidification process at the transition temperature. In contrast to pure and unprocessed inorganic PCMs, CoolFlux particles can easily be cycled between phases at the desired temperature. We have tested cyclability using differential scanning calorimetry of CoolFlux particles embedded in an inert matrix.