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제안 방법
- This is a batch process so steady state will never be reached but a look at full boil-off of the 5 L will allow for a better conclusion of heat leak. Due to the very low flow rates seen, the experiment could also improve accuracy of low flow data with a higher resolution MFM.
- Standard safety precautions were taken for working with both cryogenic liquids and explosive gases. For explosive gases, the experiments were conducted in a well-ventilated room under a large walk-in fume hood. Hydrogen sensors were installed both on the ceiling of the room outside the fume hood and in the fume hood.
- Based on the design, thermal and structural analysis, the 5 L liquid hydrogen tank was fabricated and its performance tests have been carried out. The goal for this research was building a cryostat with 0.11 L/day boil-off or full boil-off in 66 days (1.5%/day) for liquid nitrogen and 0.57 L/day boil-off or full boil-off in 9 days (11.1%/day) for liquid hydrogen. The first LN2 target has been reached with a boil-off rate of 1.
대상 데이터
- Using design data obtained from theoretical thermal calculations, fabrication of the 5 L vacuum insulated cryostat began. Outer shell was fabricated with 304 Stainless Steel (304 SUS) and the lower shell upper flange was machined with a grove for a Viton O-ring (Fig. 1).
- The 5 L container was fabricated using 304 SUS. The 5 L tank contained 3 holes in the top: one for filling/draining, the other for liquid level sensor and a 1/4” pipe for boil-off gas.
- Use of low thermal conductive materials with long thermal conduction paths is necessary for a good design. The design used two, 1 meter G-10 pipes to support the 5 L storage tank. G-10 is a low thermally conductive epoxy resin embedded with fiber glass12).
- The target for this researched tank was 0.11 L/day boil-off or full boil-off in 66 days (1.5%/day) for liquid nitrogen and 0.57 L/day boil-off or full boil-off in 9 days (11.1%/day) for liquid hydrogen. The first LN2 target has been reached; the second LH2 target needs improvement.
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