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US-IT-HXTU TEST RUN REPORT

US-IT-HXTU TEST RUN REPORT. Y. Huang, Sept. 11, 2000. US-IT-HXTU TEST RUN REPORT. LHC Inner Triplets Cooling LHC Inner Triplets Heat Exchanger Internal and External Heat Exchanger US-IT-HXTU (External) Test Goals Experiment Description US-IT-HXTU Test Results (Ch. Darve) Conclusions.

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US-IT-HXTU TEST RUN REPORT

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  1. US-IT-HXTU TEST RUN REPORT Y. Huang, Sept. 11, 2000 Yuenian Huang, US-CERN Videoconference

  2. US-IT-HXTU TEST RUN REPORT • LHC Inner Triplets Cooling • LHC Inner Triplets Heat Exchanger • Internal and External Heat Exchanger • US-IT-HXTU (External) Test Goals • Experiment Description • US-IT-HXTU Test Results (Ch. Darve) • Conclusions Yuenian Huang, US-CERN Videoconference

  3. LHC Inner Triplets Cooling • Static, pressurized He II in the cold mass • Two-phase, saturated He II absorbs heat from pressurized He II when it flows inside of a corrugated copper pipe and changes phase from liquid into vapor • The corrugated copper pipe is the heat exchanger pipe (will be given later) Yuenian Huang, US-CERN Videoconference

  4. US-IT-HXTU Test Goals • Is Heat exchanger working properly? • What is the wetted surface are of the testing heat exchanger pipe? • Cooling system control study • Liquid helium flow velocity • JT valve opening adjustment and system response • The system response as the bath temperature changes Yuenian Huang, US-CERN Videoconference

  5. Experiment Goals • The testing heat exchanger is full-sized experiment. • Measure the pressure drop along 30 m long corrugated pipe • Temperature map within the pressurized He II (cold mass side) • Liquid and vapor velocity within the corrugated pipe Yuenian Huang, US-CERN Videoconference

  6. Heat Load and Mass Flow • Heat load ~200 W (1.9 K) at nominal luminosity • Heat load ~500 W (1.9 K) at ultimate luminosity • Required mass flow rates are • 10 g/s for nominal heat load • 25 g/s for ultimate heat load • Assume 12% flashing after JT valve Yuenian Huang, US-CERN Videoconference

  7. LHC IT Heat Exchanger • Corrugated copper pipe • About 30 meter long • Total surface area: 12.5 m2 • Sitting outside of the cold mass so it is called External Heat Exchanger, compared to the internal heat exchanger arrangement for the arc dipole cooling system Yuenian Huang, US-CERN Videoconference

  8. Corrugated PipeDimensions Yuenian Huang, US-CERN Videoconference

  9. External Heat Exchanger • Simplifying the cooling system • Thermal and magnet designs are separated • Smaller temperature drop on saturated He II side • Reasonable temperature drop within the pressurized He II Yuenian Huang, US-CERN Videoconference

  10. Experiment Description • Experiment setup • Heat exchanger pipe • JT counter-flow heat exchanger • Phase separator • Accumulator pot at feedbox side • Accumulator pot at turnaround side • Instrumentation Yuenian Huang, US-CERN Videoconference

  11. CERN Test Station (B1) • Liquid helium supply: ~4.2 K • Low pressure return: ~ 1 bar • Very low pressure return: ~10 mbar Yuenian Huang, US-CERN Videoconference

  12. INSTRUMENTATION • Thermometers • Cernox for He II temperature range • Platinum for thermal shield • Pressure transducers • Vacuum gauges • Flow meters (Turbine and valve opening) • Heaters (accumulator and modules) Yuenian Huang, US-CERN Videoconference

  13. System Controls • Control Valves • Temperature control valve • Pressure control valve • Level control valve • Mass flow meter & JT valve opening • Safety Valves • Controlled by pressure only Yuenian Huang, US-CERN Videoconference

  14. Thermometers • Calibration at Engineering Lab • Curve fit and calibration data • Calibration against Vapor Pressure • During test run, all thermometers were calibrated against helium vapor pressure • Zero offset • Temperature difference due to heat leak Yuenian Huang, US-CERN Videoconference

  15. Test Run Results • Heat Leak to 1.9 K: ~34 W • Wetted Surface Area: ~ 20 to 25 % • DT vs. Heat Loads • JT Valve Opening & Mass Flow • Liquid Helium Flow Velocity • Corrugated Pipe Wetted Surface Area Yuenian Huang, US-CERN Videoconference

  16. He II Heat Exchanger Design • Internal Heat Exchanger • Pressure drop caused DT is large • Complicated plumbing • External Heat Exchanger • Pressure drop caused DT is small • Independent magnet design • Additional DT within pressurized He II Yuenian Huang, US-CERN Videoconference

  17. Conclusions • The current designed heat exchanger is working properly at nominal luminosity • Pressure drop caused DT is very small • Temperature distribution within pressurized He II is reasonable • Wetted surface area is around between 20% to 25% • All pictures can be found at N:\eng\eng_public\Yuenian\Picture files Yuenian Huang, US-CERN Videoconference

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