Superconducting cable cooling system
The present invention relates to a superconducting cable cooling system which pumps a coolant for cooling a superconducting cable to a heat exchange section by using a circulation pump, and cools the coolant by a refrigerator. Specifically, the superconducting cable cooling system includes a heat exchange unit having a cooling space charged with a liquefied gas, a flow rate sensor which detects the flow rate of the coolant, a temperature sensor which detects the temperature of the liquefied gas charged in the heat exchange unit, and a control section which controls the refrigerator based on the detected values of the flow rate sensor and the temperature sensor such that the temperature of the liquefied gas charged in the heat exchange unit has a specific value.
1. A superconducting cable cooling system which forms a circulation path by pumping a coolant used for cooling a superconducting cable to a heat exchange section by using a circulation pump, and cooling the coolant by a refrigerator, then supplying the coolant to the superconducting cable, thereby cooling the superconducting cable,
the superconducting cable cooling system comprising:
a heat exchange unit which has a cooling space charged with a liquefied gas for causing the heat exchange section and the refrigerator to perform heat exchange;
a flow rate detection unit which detects a flow rate of the coolant in the circulation path;
a temperature detection unit which detects a temperature of the liquefied gas charged in the heat exchange unit; and
a control section which controls the refrigerator based on the flow rate detected by the flow rate detection unit and the temperature detected by the temperature detection unit such that the temperature of the liquefied gas charged in the heat exchange unit has a specific value.
2. The superconducting cable cooling system according to claim 1 , wherein the refrigerator is a Brayton cycle refrigerator having a Brayton cycle heat exchange section disposed in the cooling space.
3. The superconducting cable cooling system according to claim 1 , wherein a reservoir tank, which pressurizes the coolant flowing in the circulation path to a specific pressure and stores the coolant, is connected to the circulation path.
4. The superconducting cable cooling system according to claim 1 , further comprising:
a decompression unit which decompresses the liquefied gas charged in the cooling space of the heat exchange unit.
5. The superconducting cable cooling system according to claim 1 , wherein a plurality of the heat exchange sections are provided in the circulation path, and the circulation pump is provided between any plurality of the heat exchange sections.
6. The superconducting cable cooling system according to claim 1 , wherein, in a case where a plurality of superconducting cables are provided, circulation paths are formed in correspondence to the individual superconducting cables, and heat exchange sections in the individual circulation paths are disposed in the single cooling space.
7. The superconducting cable cooling system according to claim 6 , wherein, in a case where the plurality of the superconducting cables are connected in series, the heat exchange sections included in the circulation paths formed in correspondence to the adjacent superconducting cables from among the plurality of the superconducting cables are disposed in the cooling space.