Cryogenics Products - cryogenic equipment and accesories

Cryogenic equipment and accessories - Luncescu Engineering provide the scientific, university proven method of deep cryogenic processing of materials, right in your own facility! These systems are the easiest, most reliable way to properly cryogenically process materials. We have over 10 years experience designing, engineering, and manufacturing computerized cryogenic treatment systems.

Our goal is to offer you in all these fields Turnkey solutions working through co-operation with important international partners such as Chart Industries Inc., Ferox GmbH, Stirling Cryogenics, Feeser GmbH, Bottarini Spa.

Cryogenics Definition: The branches of physics and engineering that involve the study of very low temperatures, how to produce them, and how materials behave at those temperatures. Cryogenics is the science that addresses the production and effects of very low temperatures. The word originates from the Greek words 'kryos' meaning "frost" and 'genic' meaning "to produce." Under such a definition it could be used to include all temperatures below the freezing point of water (0 °C). The techniques employed in producing low temperatures are quite different from those used in the production of artificial ice. In particular, efficient heat exchangers are required to reach very low temperatures. Over the years the term cryogenics has generally been used to refer to temperatures below approximately -150 °C.

The production of cryogenic temperatures almost always utilizes the compression and expansion of gases. In a typical air liquefaction process the air is compressed, causing it to heat, and allowed to cool back to room temperature while still pressurized. The compressed air is further cooled in a heat exchanger before it is allowed to expand back to atmospheric pressure. The expansion causes the air to cool and a portion of it to liquefy. The remaining cooled gaseous portion is returned through the other side of the heat exchanger where it precools the incoming high-pressure air before returning to the compressor. The liquid portion is usually distilled to produce liquid oxygen, liquid nitrogen, and liquid argon. Other gases, such as helium, are used in a similar process to produce even lower temperatures, but several stages of expansion are necessary.

Cryogenics has many applications. Cryogenic liquids, such as oxygen, nitrogen, and argon, are often used in industrial and medical applications. The electrical resistance of most metals decreases as temperature decreases. Certain metals lose all electrical resistance below some transition temperature and become superconductors. An electromagnet wound with a wire of such a metal can produce extremely high magnetic fields with no generation of heat and no consumption of electric power once the field is established and the metal remains cold. These metals, typically niobium alloys cooled to 4.2 °K, are used for the magnets of magnetic resonance imaging (MRI) systems in most hospitals.

Other applications of cryogenics include fast freezing of foods and the preservation of some biological materials such as livestock semen as well as human blood, tissue, and embryos. The practice of freezing an entire human body after death in the hope of later restoring life is known as cryonics, but it is not an accepted scientific application of cryogenics. The freezing of portions of the body to destroy unwanted or malfunctioning tissue is known as cryosurgery. It is used to treat cancers and abnormalities of the skin, cervix, uterus, prostate gland, and liver.