helium-refrigerated

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• Helium — (He) is the element of the 8th group of the Mendeleev’s periodic table. It is classified as an inert gas; atomic number – 2; atomic weight – 4.0026. Natural helium consists of 3He and 4He stable isotopes. It was discovered in 1868 by the French… …   Glossary of Oil and Gas

• Refrigerated transport Dewar — A refrigerated transport Dewar is a refrigerated transport vessel with a insulated Dewar flask (vacuum) design to carry cryogenic liquid. To prevent pressure build up they are equipped with safety relief valves and/or rupture discs. The liquid… …   Wikipedia

• Magnetic refrigeration — Gadolinium alloy heats up inside the magnetic field and loses thermal energy to the environment, so it exits the field cooler than when it entered. Magnetic refrigeration is a cooling technology based on the magnetocaloric effect. This technique… …   Wikipedia

• Timeline of low-temperature technology — and cryogenic technology (Refrigeration down to (–150 °C, –238 °F or 123 K) and cryogenics [ [http://www.springerlink.com/content/k468837771683266/ Low temperature technology] ] Timeline1000s* 1000s Avicenna invented the refrigerated coil, which… …   Wikipedia

• Lighter than air — Some gases are buoyant in air because they have densities lower than that of air (about 1.2 kg/m3, 1.2 g/l). Lighter than air gases are used to fill craft called aerostats, which include free balloons, moored balloons, and airships, to make the… …   Wikipedia

• Lifting gas — A lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.2 kg/m3, 1.2 g/l). Ammonia Ammonia is sometimes used to fill weather balloons. Due to its relatively high boiling point (compared to helium …   Wikipedia

• Ammonia — For other uses, see Ammonia (disambiguation). Ammonia …   Wikipedia

• Dilution refrigerator — Gas control system for a helium dilution refrigerator A dilution refrigerator is a cryogenic device first proposed by Heinz London. Its refrigeration process uses a mixture of two isotopes of helium: helium 3 and helium 4. When cooled below… …   Wikipedia

• Evaporative cooler — An evaporative cooler, photographed in Rocky Ford, Colorado, used in the drier parts of the American West to provide economical cooling …   Wikipedia

• Refrigerator — Fridge and Freezer redirect here. For other uses, see Fridge (disambiguation) and Freezer (disambiguation). For other uses, see Refrigerator (disambiguation). See also: Refrigeration A side by side refrigerator …   Wikipedia

• vacuum technology — Introduction       all processes and physical measurements carried out under conditions of below normal atmospheric pressure. A process or physical measurement is generally performed in a vacuum for one of the following reasons: (1) to remove the …   Universalium