what is a fridge used for
Commercial refrigerator and freezer units were in use for almost 40 years prior to the common home models. Most households use the freezer-on-top-and-refrigerator-on-bottom style, which has been the basic style since the 1940s.A vapor compression cycle is used in most household refrigerators, refrigeratorâfreezers and freezers.In this cycle, a circulating refrigerant such as R134a enters a compressor as low-pressure vapor at or slightly below the temperature of the refrigerator interior. Air from the freezer section is diverted to the refrigerator door, to cool milk or juice stored in the door shelf. 2  A drop down door built into the refrigerator main door, giving easy access to frequently used items such as milk, thus saving energy by not having to open the main door.