Its been a long time since i post for the last time.. ill remedy

Ive been studying secondary refrigerants these last months as somebody told me that industrial refrigeration (at least in Spain) is tending to use secondary refrigerants (like Ethylen/Propylen glycol) in 0/+2 C refrigeration rooms.

Ive read that one advantage is an easier control of relative humidity.

Could anybody explain me why?

On the other hand which devices are used in this control?

Adios, amigos