An evaporator coil is used in refrigerators to regulate the heat transfer between the interior of the evaporator and the interior of the freezer. It has four liquid jets which discharge cold air. It is the most efficient and most powerful of all refrigeration systems. The original design of the coils makes it possible for the coils to produce cool, dry, and lukewarm air. However, with the introduction of direct-heating technologies, this technology was changed and this time, the coils produce warm air. For small-scale refrigerators, this is actually not a problem because warm air is good enough to provide sufficient refrigeration.
The indirect endless coil was invented to provide greater heating output for small refrigerators. The gases it produces are contained within the refrigerant. At room temperature, this air is condensed and turns to gas by the evaporation process. This is also the process that takes place in other refrigeration systems. However, this additional cooling effect allows the refrigeration system to generate more heat than it can possibly use. When the refrigeration system is overworked, it actually produces more heat than it needs.
The need for a more efficient refrigeration system is clear. There is a potential for a problem with the compressor in this case. In order to combat this problem, a solid-state compressor is introduced. This means that the compressor does not require a refrigerant, but its charge is derived from electricity. For a while, the size of the refrigeration coils has been reduced. The use of traditional coils will remain to be the standard for some time.