Cryogenics and Cryocoolers Seminar January 2020

Photo Credits: Nicole Kirkner(CEEE)

On January 23rd, 2020, Thursday, ASHRAE student chapter at UMD hosted a seminar on Cryogenics. This was presented by Prof. Sangkwon Jeong, from the Department of Mechanical Engineering at Korea Advanced Institute of Science and Technology.

Brief Biography: Sangkwon Jeong is Professor at the Department of Mechanical Engineering of Korea Advanced Institute of Science and Technology. Prof. Jeong research interests are Cryogenics, Cryocooler design, Applied superconductivity system, Cryogenic heat transfer, and Refrigeration. He has more than 200 papers on cryogenics, applied superconductivity, and refrigeration, and more than 40 registered patents. Prof. Jeong received his PhD degree from MIT in 1992, and his BS and MS degrees from Seoul National University.
Abstract: Cryogenic Engineering and some cryocoolers 

‘Cryogenics’ is originated from the Greek word “CRYO”, which means ‘cold’, and the word “GEN”, which means ‘generate’ in English. Nowadays, cryogenics includes all phenomena occurring below approximately -150  C or 120 K, much lower temperature than what we can experience so that it does not seem to be naturally available. There is ample reason for treating cryogenics as a special field even though it is different from other fields just in terms of temperature. The physical properties of materials at very low temperature differ so dramatically from those usually encountered that people cannot just deduce the peculiar characteristic of cryogenics from their general knowledge. Cryogenic engineering is a technology that treats unusual phenomena at low temperature, covering not only physics but also chemistry, biology, mechanics, etc. This talk will introduce several interesting applications of cryogenic engineering that are categorized as superconducting technology, gas separation & liquefaction, and medical applications. They are sometimes invisibly incorporated already in our modern society because various refrigeration techniques have been developed to create such low temperature on earth. Some cryocooler technologies are to be discussed during this talk to show how such low temperature can be obtained in the cryogenic engineering laboratory of KAIST (Korea Advanced Institute of Science and Technology).

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