The design of passive conditioning shelters with phase change materials permits unattended operation.

The application of passive conditioning technology for the control of internal temperature of shelters or containers housing sensitive telecommunication equipment makes it possible to maintain internal temperature control within pre-defined limits without the use of air conditioners and without the use of any kind of power supply, resulting in maximum reliability.

Alex sistemi SpA uses Phase Change Materials (PCMs) for manufacturing their passive conditioning shelters.
Phase Change Materials (PCMs) are ‘latent’ thermal storage materials. They use chemical bonds to store and release heat. The thermal energy transfer occurs when a material changes from a solid to a liquid or from a liquid to a solid form. This is called a change in phase. When PCMs reach the temperature at which they change phase, they absorb large amounts of heat without getting hotter. PCMs absorb 75% more heat than water does and the PCM system is therefore more compact and more reliable at maintaining internal temperature.

Passive conditioning shelters with PCMs, suitably dimensioned, are extremely reliable and can last for more than 15 years, with minimum maintenance requirements. They can be used in deserts and in other geographic zones with a high daily range of temperatures.