Refrigerated transport Dewar
- 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 The liquid can be withdrawn as a gas by passing liquid through an internal vaporizer or as a liquid under its own vapour pressure [ [http://www.uow.edu.au/content/groups/public/@web/@sci/@chem/documents/doc/uow016882.pdf Handling, Transport and Storage of Cryogens] ] .
History
A non refrigerated air-transportable dewar for 750 liters of liquid hydrogen was developed by H.L. Johnston in ca. 1952 [ [http://history.nasa.gov/SP-4404/ch4-4.htm LIQUID HYDROGEN AS A PROPULSION FUEL,1945-1959] ] . The heat flow to the liquid hydrogen shell was 4 watts, boill-off about 7.5 liters per day, or 1 % of the rated capacity. They were equipped with valves, instruments, and a vacuum pump.
The refrigerated transport dewar was based on a design by the Arthur D. Little Company and produced by the Cambridge Corporation using a closed cycle helium refrigerator, the 2000 liters of liquid hydrogen could be stored or transported indefinitely with no loss as long as the refrigerator was operated. It was placed on a 10.7-meter semi-trailer and weighted 18.1 metric tons, including a diesel generator for refrigerator operation away from electric power lines.
ee also
*Enthalpy of vaporization
*Hydrogen economy
*Timeline of hydrogen technologies
References
External links
* [http://www.ika.rwth-aachen.de/r2h/index.php/Liquid_Hydrogen_Transport_by_Truck Liquid Hydrogen Transport by Truck]
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