Gustav Fredrik Lorentzen (13 January 1915 – 7 August 1995) was a Norwegian

thermodynamic Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws of ther ...

scientist. Gustav Lorentzen was a professor at

Norwegian Institute of Technology The Norwegian Institute of Technology (Norwegian: ''Norges tekniske høgskole'', NTH) was a science institute in Trondheim, Norway. It was established in 1910, and existed as an independent technical university for 58 years, after which it was m ...

, and

Norwegian University of Science and Technology Norwegian, Norwayan, or Norsk may refer to: *Something of, from, or related to Norway, a country in northwestern Europe *Norwegians, both a nation and an ethnic group native to Norway *Demographics of Norway *The Norwegian language, including the ...

. In the late 1980s, Gustav Lorentzen rediscovered how CO₂ could be used as a

refrigerant A refrigerant is a working fluid used in the heat pump and refrigeration cycle, refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated phase transition from a liquid to a gas and back again. Ref ...

in heating and cooling applications. He developed the modern

transcritical cycle A transcritical cycle is a closed thermodynamic cycle where the working fluid goes through both subcritical and supercritical states. In particular, for power cycles the working fluid is kept in the liquid region during the compression phase a ...

in 1988–1991. In 1988 Lorentzen designed a concept for a new, but simple and efficient way of regulating CO₂ systems. This idea became the turning point in the re-invention of CO₂ cooling technology.The rediscovery of CO2
SHECCO Meanwhile, the Japanese corporation Denso had familiarized itself with Lorentzen's dissertation in 1993, and was evaluating the concept as a basis for a new air-condition application in cars. A series of communications between Lorentzen and Denso followed and the result of the collaboration between Lorentzen and Denso was a fundamental step in the innovation of EcoCute which was commercialized in 2000s.

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External links

7th IIR Gustav Lorentzen Conference on Natural Working Fluids, May 28 to 31st 2006, Trondheim, Norway

IIR Gustav Lorentzen Conference on Natural Working Fluids

IIR Gustav Lorentzen Conference on Natural Working Fluids
{{DEFAULTSORT:Lorentzen, Gustav 1915 births 1995 deaths 20th-century Norwegian scientists

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