Abstract: A refrigeration system for a refrigerator or a freezer, comprising a compressor; a condenser; and an evaporator, wherein the evaporator includes a coil formed of a plurality of linear sections connected by a plurality of curved sections, and the coil is attached to a plurality of fins, each fin has a length and a width, and the width defines an evaporator depth; and the plurality of curved sections are arranged in a number of columns to define a tube pattern formed along the evaporator depth.

Abstract: A heat exchanger system having a fluid passage operable to fluidly communicate a first fluid and a heat transfer surface extending from the fluid passage for transferring heat between the first fluid and a second fluid. The system can further include a heating element operably coupled to and selectively applying thermal energy to at least one of the fluid passage and the heat transfer surface.

Abstract: An air cycle air conditioning system for treating air contained within a passenger compartment of a vehicle. The system includes a compressor for receiving air from the passenger compartment and compressing the air, thereby producing charged air. Further, an expander is provided selectively coupled to the compressor for expanding the air and cooling the air communicated to the passenger compartment. The system further includes an air-to-air heat exchanger that cools the air received by the compressor-and supplies cooled charged air to the vehicle's engine.