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Applicability of liquid air as novel cryogenic refrigerant for subsea tunnelling construction

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Abstract
The artificial ground freezing technique has been widely adopted in tunnel construction in order to impede heavy water flow and to reinforce weak sections during excavation. While liquid nitrogen is one of common cryogenic refrigerants particularly for rapid freezing, it has a serious potential risk of suffocation due to an abrupt increase in nitrogen content in the atmosphere after being vaporized. This paper introduces a novel cryogenic refrigerant, liquid air, and addresses the applicability of it by performing a series of laboratory chamber experiments. The key parameters for the application of artificial freezing using liquid air in subsea tunnel construction are freezing time and energy consumption, which were evaluated and discussed in this paper. The comparative study of these parameters between the use of liquid air and liquid nitrogen demonstrates that liquid air with no risk of suffocation can be a potential substitute for liquid nitrogen delivering the equivalent performance. In addition, the theoretical model was adopted to evaluate the chamber experiments in an effort to estimate the freezing time and the energy consumption ratio (energy consumption for maintaining the frozen state to the energy consumption for freezing soil specimens).
Author(s)
고태영손영진원종묵이동섭이인모최항석
Issued Date
2021
Type
Article
Keyword
artificial ground freezingenergy consumption ratiofreezing timeheat transferliquid airrefrigerant
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9207
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A684088921&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Applicability%20of%20liquid%20air%20as%20novel%20cryogenic%20refrigerant%20for%20subsea%20tunnelling%20construction&offset=0&pcAvailability=true
Publisher
GEOMECHANICS AND ENGINEERING
Location
대한민국
Language
영어
ISSN
2005-307X
Citation Volume
27
Citation Number
2
Citation Start Page
179
Citation End Page
187
Appears in Collections:
Engineering > Civil and Environmental Engineering
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