Refrigerator

A refrigerator comprising:

• a main body defining a compartment, the compartment having an access opening and a first wall;
• a door supported by the main body for selectively closing at least part of the access opening;
• a sub-compartment on the door, the sub-compartment comprising a second wall having an opening;
• a heat exchanger supported by the first wall and positioned so that when the door is closed the heat exchanger is exposed to an interior of the sub-compartment through the opening, the heat exchanger comprising a heat exchanging plate with a first surface exposed to the interior of the sub-compartment when the door is closed and a second surface on an opposite side of the heat exchanging plate from the first surface, the heat exchanging plate comprising a plurality of semi-spherical projections formed by the heat exchanging plate such that the semi-spherical projections of the plurality of semi-spherical projections extend outward from the first surface of the heat exchanging plate and are exposed to the interior of the sub-compartment when the door is closed, the semi-spherical projections defining receiving channels formed by the heat exchanging plate on the second surface of the heat exchanging plate, receiving portions of the receiving channels being formed in the second surface;
• and
• a sealed refrigeration system containing a working medium for cooling the heat exchanger, and comprising a fluid connection loop between an evaporator and a condenser of the sealed refrigeration system, the fluid connection loop being attached to the heat exchanging plate,
• wherein the fluid connection loop comprises a serpentine portion disposed the first wall, the serpentine portion being thermally coupled to the heat exchanger, the serpentine portion comprising a plurality of bent sections that are received in the receiving channels on the second surface of the heat exchanging plate.