Climator has chosen to work with salt hydrate based PCMs. We do this because PCM based on salts have the best storage capacity, are more environmental friendly and are more economical.

ClimSel™ is a salt hydrate based PCM. This means that the main functioning ingredient, apart from water, is a salt. There are several different types of PCMs that use different types of materials for the phase change.

PCM functions by either charge or discharge energy. You can compare it with a battery. The difference is that as the battery charges and discharges electricity, while PCM charges and discharges energy.

The most common PCM is Water. This PCM melts at 0ºC and freezes at approx. -2ºC. The difference between the melting point and the freezing point is called “supercooling”. Climators PCMs has an average supecooling of 2ºC - 4ºC.

There are 3 things that determine how well the PCM will function.

1. Delta T, the difference between the highest and lowest temperature of the surrounding temperature. The bigger this difference is the faster the phase change will occur. E.g. the ClimSel™ C24 melts around 24ºC. If the surrounding temperature is 5ºC over or under the melting point the charging and discharging will take longer time than if the surrounding temperature is 50ºC over or under. To compare with water, water freezes faster in -25ºC C then in -5ºC, it also thaws faster in 25ºC then in 5ºC.

 2 The amount of PCM. More PCM equals more storage capacity. More PCM will take longer to charge and discharge. To compare with water, 1kg of ice will melt faster than 1ton of ice no matter the surrounding temperature, because it will take a lot more energy to do this.

3. Conductivity, the faster you can transfer into the energy into the material, the faster the PCM will change phase. All PCMs are packed in a container and most of the time this determine the energy transfer time.

For more specific information about each ClimSel™ click on our data sheets to the left.