Cold storage unit apparatuses designed for high energy efficiency are provided, which may include: a refrigeration system; a box enclosing an interior space, the box formed by a plurality of insulated sides; an entry into the interior space including a plurality of openable barriers facilitating preventing entry of heat or moisture into the interior space; and a power system connected to the refrigeration system, the power system facilitating independent operation of the refrigeration system when not connected to a power grid, and further facilitating a net energy use of zero from a power grid when connected to a power grid. Cold storage units may further include systems for using the refrigerant of the refrigeration system to defrost one or more components of the cold storage unit, and for using the refrigerant to facilitate maintaining a desired internal temperature of the interior space of the cold storage unit.

A refrigerated device is configured to enhance condensate evaporation and includes a compartment including an access door, a refrigeration circuit for cooling the compartment, the refrigeration circuit including an evaporator coil and a condenser with an associated condenser fan, and a condensate pan for capturing condensate from the evaporator coil. At least one first air flow path is provided from a pressure side of the condenser fan, into and along at least part of the condensate pan and then to a suction side of the condenser fan. At least one second air flow path is provided from the pressure side of the condenser fan, into and along at least part the condensate pan and then back to the pressure side of the condenser fan.

An evaporative condensate dissipation system includes a receptacle configured to receive and accumulate a liquid condensate from a cooling element of a refrigeration system, a rotating element (e.g., an array of plates, a rotating drum, etc.) disposed at least partially within the receptacle such that a portion of the rotating element is submerged in the liquid condensate, and a motor configured to cause the rotating element to rotate such that a portion of the rotating element is periodically submerged in the liquid condensate and emerged from the liquid condensate. A fan may be used to provide an airflow across a surface of the rotating element to increase expedite evaporative dissipation. The fan and/or motor may be operably controlled by a switch or sensor responsive to a level of the liquid condensate accumulated in the receptacle.

A refrigerator includes a compressor configured to compress a refrigerant, a condenser configured to condense the refrigerant compressed in the compressor, an expander configured to depressurize the refrigerant condensed in the condenser, a plurality of evaporators configured to evaporate the refrigerant depressurized in the expander, a first valve configured to be operated to introduce the refrigerant into at least one of the plurality of evaporators, a hot gas valve device disposed at an inlet side of the first valve and configured to guide the refrigerant passed through the compressor or the condenser to the plurality of evaporators, and a hot gas path configured to extend from the hot gas valve device to the plurality of evaporators.

A preferred embodiment utilizes the waste heat from a refrigerant cycle to aid in the removal of condensate from a refrigerated case used primarily by grocery stores. Certain embodiments use a heating element to boil off condensate or a pump to remove the condensate. Another embodiment utilizes a wicking element and a shroud that directs hot air from the condenser through the wick thereby increasing the condensate evaporation rate. Yet another embodiment utilizes the hot gas tube from the refrigeration system routed through the bottom of the condensate tray to pre-heat the condensate to accelerate evaporation. Alternative embodiments combine certain features to create even more efficient system such as a heating element used with the wick system or the hot gas system used with the wick system. In some embodiments, a mold and mildew inhibitor is added to the condensate to maintain cleanliness.

A refrigerator includes a grille fan assembly provided behind a storage space and shielding an evaporator, and a machine room independent of the storage space. The grille fan assembly includes a case with an open front, a fan configured to force an air flow between the storage space and the heat exchange space, a grille panel shielding the open front of the case and having a discharge port for discharging cold air to the storage space and a suction port for suctioning air from the storage space, a partition dividing of the case into a cold air flow space and a heated air flow space, an exhaust member extending from the case to the machine room and communicating an inside of the case with of the machine room, and a machine room exhaust damper configured to open and close the exhaust member.

A refrigeration system of a household appliance including a compressor, a drip pan configured to collect evaporator condensate, and a pre-condenser. The pre-condenser includes a coil extending from the compressor and having a deformable section and a nondeformable section, wherein the deformable section is disposed between the drip pan and the compressor, and at least a portion of the nondeformable section is disposed in the drip pan such that heat from the coil aids in evaporation of the condensate.