The easiest way to explain the PCM (Phase Change Material) is to compare it to water. Water has 3 phases: ice, liquid and steam.
For example, Climsel C24 has the following characteristics:
Below 24° C it is solid, when it reaches 24°C or over it will turn to liquid. The same thing happens the other way around. Coming from over 24°C it is liquid and when the surrounding temperature decrease under 24°C it will turn solid.
The speed of the phase change is depedent of the heat load, ambient temperature and conductivity.
When a substance is changing phase, a lot of energy is needed. This is the force of nature Climator is utilizing. This is how ClimSel cools, heats and stabilizes.
Climator has a number of products that can change water to ice from -18°C to +70°C and then back again.