Method for storing a coolant fluid in melting equilibrium

A method for storing a coolant fluid comprising two phases of one and the same substance in melting equilibrium, according to which:

• a thermally isolated enclosure for storing said fluid is used, in which the coolant fluid stored settles into a lower, relatively liquid, layer and an upper, relatively solid, layer
• the coolant fluid to be stored is introduced into the enclosure at the level of the lower, relatively liquid layer
• the coolant fluid to be removed from storage is extracted from the enclosure at the level of the upper layer
• a gaseous headspace is set up between the upper layer and the upper wall of the enclosure
• and the coolant fluid to be removed from storage is extracted from a withdrawal zone located in the storage enclosure at the level of the interface between the upper layer and the gaseous headspace
• wherein a cone for pouring out the coolant fluid stored is made, within the enclosure and at the level of the withdrawal zone and the cross section of which decreases downward, and an ascending or descending vertical flow of the fluid to be removed from storage is formed, starting from the pouring cone, while generating, only by interaction of the vertical flow with respect to the pouring cone, agitation in the coolant fluid extracted over at least a part of the said flow.