(57) A freezer, having an outer housing (1) and a door (2), contains a number of shelves
(3 to 6) upon which frozen food (7) is stored.
Each shelf comprises a casing (8) filled with brine solution (10) having an eutectic
temperature a few degrees lower than the desired operating temperature of the freezer.
An evaporator coil (9), forming part of a refrigeration system, including a compressor,
of the freezer, is immersed in the brine solution (10) in each casing.
During the night storage period, the compressor is run on cheap rate electricity and
the brine solution (10) gives up heat energy, thereby undergoing a phase change.
During the daytime, the compressor is stopped and the brine solution (10) slowly absorbs
heat energy from within the freezer, thereby slowly undergoing a reverse phase change
and maintaining a substantially constant desired operating temperature of the freezer.
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