Dynamic simulation of 10 kW Brayton cryocooler for HTS cable

Dynamic simulation of a Brayton cryocooler is presented as a partial effort of a Korean governmental project to develop 1∼3 km HTS cable systems at transmission level in Jeju Island. Thermodynamic design of a 10 kW Brayton cryocooler was completed, and a prototype construction is underway with a bas...

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Bibliographic Details
Main Authors: Ho-Myung, Chang, Park Chan Woo, Yang, Hyung Suk, Hwang Si Dole
Format: Conference Proceeding
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONTROL
COOLING SYSTEMS
Cryogenic temperature
DESIGN
Flow velocity
HEAT EXCHANGERS
HIGH-TC SUPERCONDUCTORS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Plate-fin heat exchangers
SIMULATION
STEADY-STATE CONDITIONS
TRANSIENTS
Turboexpanders
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Summary:Dynamic simulation of a Brayton cryocooler is presented as a partial effort of a Korean governmental project to develop 1∼3 km HTS cable systems at transmission level in Jeju Island. Thermodynamic design of a 10 kW Brayton cryocooler was completed, and a prototype construction is underway with a basis of steady-state operation. This study is the next step to investigate the transient behavior of cryocooler for two purposes. The first is to simulate and design the cool-down process after scheduled or unscheduled stoppage. The second is to predict the transient behavior following the variation of external conditions such as cryogenic load or outdoor temperature. The detailed specifications of key components, including plate-fin heat exchangers and cryogenic turbo-expanders are incorporated into a commercial software (Aspen HYSYS) to estimate the temporal change of temperature and flow rate over the cryocooler. An initial cool-down scenario and some examples on daily variation of cryocooler are presented and discussed, aiming at stable control schemes of a long cable system.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4860922