What is the cooling cycle?
The cooling cycle is the thermal engine operating otherwise, known as the heat pump phase change. The use of refrigerant, which is cooked at low temperature, produces relative cold and lowers the refrigerator temperature to a level that prevents bacteria from growing and destroying food. The cold cycle works essentially the same principle that makes your hand feel cold when water evaporates from it. Other liquids, including some known as refrigerators, produce even lower temperatures when evaporation.
The cooling cycle is a closed gas loop that is subject to four stages. The first stage is a compressor that compresses refrigerant to increase its temperature. The gas is then directed through the coils of heat scattering that release heat outside the refrigerator. As it distracts heat, the refrigerant cools and repeats it to the liquid. This liquid then passes through high pressure/low -pressure thresholds called expansion valve, which causes to expand and change the phase to gas. Cold gas is circulated again to the refrigeratorAnd it absorbs heat from the inside before it is directed again into the compressor. The purpose of the cooling cycle is to take heat from the inside of the refrigerator and transfer it to the outside.
To better understand the cooling cycle, it must be familiar with the idea of phase change. The evaporation fluid remains at a constant temperature until the phase to the gas changes. For example, boiling water always remains at its boiling point, 212 ° F (100 ° C). If the refrigerator could keep fresh food by ensuring that it remains below 300 ° F (148 ° C), for example, instead of 40 ° C (4 ° C), water could be used as a coolant because the boiling point of the water would be cold due to the cooling level of 300 ° F.
The traditional cooler used in the cooling cycle is ammonia, but it is toxic to humans. Ammonia was replaced in the 1930s chlorofluorocarbones (CFC), but it was found that this compound damaged the ozone layer and in the 1970sech phase. Newer compounds such as Hydrofluorocarbones (HFC), efficiently chilled, are non -toxic and do not harm the ozone layer. The invention of cooling is probably one of the most important inventions of the 20th century, allowing to transport food over long distances or to maintain a long duration without bearing.