Abstract: A refrigeration system having a closed circulating circuit filled with a refrigerant which on evaporation expands and gives rise to an increase in pressure in the whole or in parts of the circulating circuit, and which at ambient temperature has a saturation pressure that is higher than the maximum working pressure in the refrigeration circuit. A refrigeration of this kind may, for example, be carbon dioxide. By allowing vaporized refrigerant to condense against the surface of the refrigerant in liquid phase, contained in a container that is insulated and has adapted size and adapted liquid level, the pressure in the circulating circuit can be maintained below the maximum working pressure of the refrigeration circuit. Thus undesirable build-up of pressure in the event of, e.g.