Operational Characteristics of the 200-m Flexible Cryogenic Transfer System

Lin, Ming-Chyuan; Wang, C.; Chang, Ming‐Huei; Chung, Fu-Tsai; Yeh, Meng-Shu; Lin, Yu-Hang; Chen, L. J.; Tsai, Meng-Hung; Yang, T. T.; Lo, Chih‐Hung; Yu, Tsung-Chi; Chang, L.H.; Hsiao, F. Z.; Tsai, Hung Chin; Chiou, W. S.; Li, H. C.; Lin, T.F.

doi:10.1007/s10948-012-2035-x

Cited by 4 publications

(8 citation statements)

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“…The pressure transducers and Venturi-type flow meters on VB #1 and VB #2 and the electric power of a heater inside the LHe vessel of S0 were well calibrated before measurement. On maintaining constant both the level and pressure of the LHe vessel of S0 and varying the electric power of a heater inside the LHe vessel, both the total mass flow rate and the accumulated static heat load of the LHe supply line from MD #1 to S0, with static heat load of S0 included, can be deduced from the differential pressure of the CGHe flow read from the Venturi-type flow meter with the technique developed; refer to Lin et al (2013). The range of the applied heater power is limited by several operating parameters, such as the pressure of MD #1, the pressure of S0, the openings of the LHe valves at VB #1 and of the CGHe valves at VB #1, the speed of turbines in CB #1 etc.…”

Section: Results Of Experimental Measurementsmentioning

confidence: 99%

“…As expected, the applied heater power conforms to a linear fit with the square root of the differential pressure read from the Venturi-type flow meter. According to the technique developed (Lin et al 2013), the accumulated static heat load along the LHe supply line from MD #1 to S0, with the static heat load of S0 included, are obtained from a linear-regression fit of each data set shown in Fig. 3.…”

Section: Results Of Experimental Measurementsmentioning

confidence: 99%

“…A cryogenic transfer system including flexible cryogenic transfer lines of corrugated type of total length 220 m has been installed at NSRRC (Lin et al 2010) to deliver LHe for a cryogenic test stand. This system might be the longest cryogenic flexible lines ever implemented for similar applications.…”

Section: Discussionmentioning

confidence: 99%

“…Because of the varied piping elevation from the experimental hall of TLS to the building of the SRF laboratory, LHe supply lines L4–L12 and the CGHe return lines g2–g10 have cryogenic piping with ascending and descending sections. Figure 1 shows also the complicated piping path between VB #1 and VB #2, with details available in the article presented by Lin et al (2010). …”

Section: Cryogenic Test Stand and Its Configurationsmentioning

confidence: 99%

“…The vapor quality for each cryogenic piping element is then calculated asandwith parameter Χ of the flash ratio defined (Lin et al 2013) asin which is the applied heater power at S0; is the enthalpy of saturated LHe at MD #1 of which the value is determined only by the pressure of MD #1; and are enthalpies of saturated liquid and gaseous helium at S0, respectively, of which their values depend also on only the pressure of S0. Total heat load S1, , is approximately 65 W, as a sum of static heat load 30 W (Lin et al 2006) and applied heater power 35 W. This heat load is thus included in the total heat load for all test cases to calculate the pressure drops of the long cryogenic transfer lines.…”

Section: Heat Loads Of the Cryogenic Transfer Linesmentioning

confidence: 99%

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Pressure drop of two-phase helium along long cryogenic flexible transfer lines to support a superconducting RF operation at its cryogenic test stand

Chang

Tsai

et al. 2016

SpringerPlus

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BackgroundEstablishing a stand-alone cryogenic test stand is of vital importance to ensure the highly reliable and available operation of superconducting radio-frequency module in a synchrotron light source. Operating a cryogenic test stand relies strongly on a capability to deliver two-phase helium along long cryogenic transfer lines. A newly constructed cryogenic test stand with flexible cryogenic transfer lines of length 220 m at National Synchrotron Radiation Research Center is required to support a superconducting radio-frequency module operated at 126.0 kPa with a 40-W dynamic load for a long-term reliability test over weeks. It is designed based on a simple analytical approach with the introduction of a so-called tolerance factor that serves to estimate the pressure drops in transferring a two-phase helium flow with a substantial transfer cryogenic heat load. Tolerance factor 1.5 is adopted based on safety factor 1.5 commonly applied in cryogenic designs to estimate the total mass flow rate of liquid helium demanded. A maximum 60-W dynamic load is verified with experiment measured with heater power 60 W instead after the cryogenic test stand has been installed.ResultsAligning the modeled cryogenic accumulated static heat load with the results measured in situ, actual tolerance factor 1.287 is obtained. The feasibility and validity of our simple analytical approach with actual tolerance factor 1.287 have been scrutinized by using five test cases with varied operating conditions. Calculated results show the discrepancies of the pressure drops between the estimated and measured values for both liquid helium and cold gaseous helium transfer lines have an underestimate 0.11 kPa and an overestimate 0.09 kPa, respectively. A discrepancy is foreseen, but remains acceptable for engineering applications from a practical point of view.ConclusionsThe simple analytical approach with the introduction of a tolerance factor can provide not only insight into optimizing the choice of each lossy cryogenic piping element of the transfer lines in the design phase but also firm guidance for upgrading the present cryogenic transfer lines for its subsequent application.

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Section: Results Of Experimental Measurementsmentioning

confidence: 99%

Section: Results Of Experimental Measurementsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Cryogenic Test Stand and Its Configurationsmentioning

confidence: 99%