A refrigerator with a freezing storage assembly, comprising: a cabinet provided therein with a storage compartment for achieving a freezing storage function; the freezing storage assembly arranged in the storage compartment and comprising: a magnetic frame made of a magnetic material; and a storage box provided in a space enclosed by the magnetic frame and defining a freezing storage space; and a plurality of groups of electromagnetic coils arranged on an inner surface of the magnetic frame and configured to form magnetic fields with magnetic pole directions at a set angle in the freezing storage space, the magnetic fields passing through the magnetic frame to complete closed loops of magnetic lines.

A method and apparatus for evaporative cooling of materials within a vacuum chamber by maintaining a controlled partial pressure environment. The method involves sealing material inside a chamber, reducing the internal pressure using a vacuum pump, and simultaneously introducing external gassuch as ambient air, nitrogen, or inert gasesinto the chamber. A constant partial pressure is maintained by balancing the gas input and vacuum pump operation, allowing for efficient evacuation of vaporized liquid without recondensation. The system can operate with either constant or variable flow rates for both gas input and vacuum pumping, depending on desired cooling conditions, chamber size, and material characteristics. The apparatus includes a sealable vacuum chamber, at least one external gas inlet, and a vacuum pump configured to sustain the target partial pressure.