Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea
Abstract
:1. Introduction
2. Total System and Configuration of Three-Phase Coaxial Superconducting Power Cable
3. Cooling Circulation Structure of Three-Phase Coaxial Superconducting Power Cable
4. Temperature Analysis of Three-Phase Coaxial Superconducting Power Cable Using FEM Modeling
5. Simulation Results
6. Simulation Results Verification
7. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Cases | LN2 Path Types | Remark |
---|---|---|
Case I | 1st cryostat inlet Center pipe outlet | No need for a circulation pipe (one circuit) |
Case II | Center pipe inlet 1st cryostat outlet | Increase the diameter of the HTS cable (high pressure drop) Uncertain temperature |
Case III | 1st cryostat inlet Another return pipe outlet | Estimation of max. temperature Need for an extra pipe for the circulation of LN2 (two circuits) |
Part | Parameter | Value | Unit |
---|---|---|---|
Condition of thermal load | Heat from HTS wire (AC loss) | 1 | W/m |
Heat from the exterior | 1 | W/m | |
Condition of liquid nitrogen | LN2 temperature of inlet | 68 | K |
Mass flow | 0.5 | Kg/s | |
Dynamic viscosity | 1.64 ✕ 10−4 | Pa·s | |
Heat capacity | 2 | kJ/kg·K |
Parameter | Value | Remark | ||
---|---|---|---|---|
Case I&II | Case III | |||
Center Pipe | Inner diameter | 40 mm | - | Corrugated tube |
HTS & Insulation layer | Thickness | About 10 mm | About 12 mm | |
1st cryostat | Inner diameter | 100 mm | 80 mm | Corrugated tube |
Return Pipe | Inner diameter | - | 60 mm |
Parameter | Value (Case II) | Remark | |
---|---|---|---|
Center Pipe | Inner dia. | 32 mm | Corrugated tube |
HTS & Insulation layer | Thickness | About 10 mm | |
1st cryostat | Inner dia. | 85 mm | Corrugated tube |
Heat from HTS wire & exterior Mass flow of LN2 | 1.75 W/m | ||
0.46 kg/s |
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Lee, S.-J.; Sung, H.-J.; Park, M.; Won, D.; Yoo, J.; Yang, H.S. Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea. Energies 2019, 12, 1740. https://doi.org/10.3390/en12091740
Lee S-J, Sung H-J, Park M, Won D, Yoo J, Yang HS. Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea. Energies. 2019; 12(9):1740. https://doi.org/10.3390/en12091740
Chicago/Turabian StyleLee, Seok-Ju, Hae-Jin Sung, Minwon Park, DuYean Won, Jaeun Yoo, and Hyung Suk Yang. 2019. "Analysis of the Temperature Characteristics of Three-Phase Coaxial Superconducting Power Cable according to a Liquid Nitrogen Circulation Method for Real-Grid Application in Korea" Energies 12, no. 9: 1740. https://doi.org/10.3390/en12091740