1 / 40

US-IT-HXTU Test Run @ CERN 07/17 to 08/02

US-IT-HXTU Test Run @ CERN 07/17 to 08/02. Status by Christine Darve and Yuenian Huang E&F meeting, 08/29/00. Summary. Overview on the project Goal Previous Measurements Trip report Preliminary results Heat eXchanger Test Unit Performance LHC Nominal and Ultimate Conditions

niabi
Download Presentation

US-IT-HXTU Test Run @ CERN 07/17 to 08/02

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. US-IT-HXTUTest Run @ CERN 07/17 to 08/02 Status by Christine Darve and Yuenian Huang E&F meeting, 08/29/00

  2. Summary • Overview on the project • Goal • Previous Measurements • Trip report • Preliminary results • Heat eXchanger Test Unit Performance • LHC Nominal and Ultimate Conditions • Limitation of the set-up • Status cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  3. Overview on the project • Goal Validation of the LHC-IRQ inner triplets cryogenic system Proposed External Heat Exchanger • Previous measurements • Cryoloop (1993, CERN, 20m, corrugated copper tube) • Small Scale Heat Exchanger (1998, CERN, 0.1m, smooth copper tube) • Small Scale Heat Exchanger Test (2000, FNAL, 0.1m, corrugated copper) • Trip report: • Installation • Commissioning • Operation cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  4. LHC-IRQ Cryostat External Heat Exchanger cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  5. Trip Report - Installation • Instrumentation • Damaged thermometers • Connection to electrical racks • Check each output • Mechanical • Bellow welding • Survey for the 1.4% slope • Interconnection assembly • Electrical powering • UPS • 900 Watt cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  6. Trip Report - Installation • Cryogenic installation at SM18 • LHe supply • LP gaseous return • Cold Compressor Unit • Data acquisition and control system • PCview software • Advanced Predictive Control • PLC, web connection cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  7. Trip Report - Commissioning • At room temperature • Pressure test • Leak check • At cryogenic temperatures • Initial cool-down • Time constants for stabilization and He velocity • Zeroing (cf Preliminary Results) cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  8. Trip Report - Operation • Instrumentation (~85 acquisition channels/97 devices) • Thermometers • Pressure transducers • LHe level transmitters • Heaters • Controlled valves • Pressure safety valves • Mass-flow meter • JT valve • Rough pump + Turbo molecular pump • Vacuum indicator cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  9. Process and Instrumentation Diagram Figure 2 cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  10. Trip Report - Operation • Parameters to fix for a data measurement • Saturated pressure • Heat loads for the magnet simulation • JT opening // mass-flow • Output parameters • Temperature display • Wetted area • Performance of the HXTU • Tools for the measurement/indicator • LHe level, LT9304 • Temperature transient, TT1121b HXTU Evolution of the heat transfer from heaters to the dyn. saturared HeII than toward the CCU • Steady-state measurements • Minimal wetted area • Temperatures diff. < 2mK cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  11. Trip Report - Operation • Measurements list • 36 steady-state data points • Psat=16 mbar (Tsat=1.790 K) x 9 • 1 unbalance cond.(3*20watt+80watt) • 2 unstable measurements • Psat=18 mbar (Tsat=1.820 K) x 10 • Psat=19 mbar (Tsat=1.840 K) x 5 • Nominal condition (247watt) • Psat=21 mbar (Tsat=1.870 K) x 11 • Psat=24.5 mbar (Tsat=1.915 K) x 1 • Ultimate condition (315 watt) • After 2nd of August • Psat=32 mbar (Tsat=2.007 K) x 6 cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  12. Preliminary Results • Pre-measurements • Mechanical calibration of the controlled valves • Controlled valves PID parameters fine-tuning (automatic run) • Zeroing of thermometers • Calibration of the mass-flow meter • Calibration of the JT opening • Determination of the static load • Heat eXchanger Test Unit Performance • LHC Nominal and Ultimate Conditions cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  13. Zeroing of thermometers Figure 3: Thermometer Error (Enrique Blanco) cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  14. Calibration of mass-flowmeter and JT opening cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  15. Static load - Theoretical Qstatic= Qs1 + Qs2 + Qrts_cm + Qcts_cm  =>34 watt • Qs1 : transfer in superfluid HeII / inlet • Qs2 : transfer in superfluid HeII / outlet • Qrts_cm : radiation from the thermal shield to the cold mass • Qcts_cm : solid conduction from the room temperature to the cold mass, via the support spiders Conduction in superfluid HeII => 18 Watt Q/s = [(X(Tf)-X(Tc))/l]^0.29 Hypothesis : Thermal lenght = 1 cm Solid  Conduction for the G10 spiders =>4 Watt Hypothesis : Contacts : area= 0.5 in. x 0.5 in, length=4 in Radiation from thermal shield to cold mass => 12 Watt Hypothesis : Tts/Tcm =110 K / 1.88K Qrts_cm=E.Surf.sig.(Tts4-Tcm4) cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  16. Static load - Experimental 34 watt cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  17. Measurements of the HXTU performance Evolution of the instrumentation read-out: #12 (201W, 21mbar): TT cm, LT9304 #24 (55W, 18mbar): TT JTHX, LT9314 cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  18. Parameters evolution towards steady state cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  19. Parameters evolution towards steady state cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  20. Measurements of the HXTU performance Distribution of the temperatures for the steady state Ex. #24: 55W, 18mbar cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  21. Measurements of the HXTU performance Distribution of the temperatures for the steady state Ex. #36: 121W, 16mbar cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  22. Measurements of the HXTU performance Distribution of the temperatures for the steady state Ex. #36: 121W, 16mbar cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  23. Measurements of the HXTU performance Distribution of the temperatures differences (TT-Tsat) Ex. #36: 121W, 16mbar cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  24. Measurements of the HXTU performance B cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  25. Measurements of the HXTU performance B B cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  26. Measurements of the HXTU performance cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  27. Measurements of the HXTU performance cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  28. Temperature evolution - HX side and magnet side Plot send by Rob van Weelderen (08/25/00) cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  29. Temperature evolution - HX side and magnet side HX side Magnet side HX side Magnet side cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  30. Temperature evolution - HX side and magnet sideUS-IT-HXTU Comparison between HX(side) and magnet(side) temperature evolution HX side Tsat=1.79K (16 mbar) HX side Magnet side Magnet side cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  31. Results from the Small Scale Heat eXchanger Test Results of the SSHX permit to deduce the wetted areas of the full scale HXTU Bronze sample OFHC OFHC=hydrochloric acid cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  32. Results from the Small Scale Heat eXchanger Test cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  33. Nominal Condition - Estimation Total Heat Loads in the Inner Triplet at IP5 or IP1 by Tom Peterson, 7 March 2000 Total integrated heat load to inner triplet 210.6 Watt cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  34. Nominal Condition - Temperature Map Distribution of the temperatures cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  35. Nominal Condition - Temperature Map Distribution of the temperatures differences (TT-Tsat) cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  36. Ultimate Condition - Estimation Total Heat Loads in the Inner Triplet at IP5 or IP1 by Tom Peterson, 7 March 2000 Total integrated heat load to inner triplet 471.8 Watt cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  37. Ultimate Condition - Temperature Map Distribution of the temperatures differences (TT-Tsat) for steady-state cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  38. Limitation of the set-up • CCU • Stability at high flow • Broke down of the Air Liquid CCU • Several users • Power suppliers overloaded • Limitation in tension, Resistance(T) • Mass-flowmeter accuracy • Previous measurement :20% • JT valve opening cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  39. Limitation of the set-up • Thermometer calibrations • Large off-set (P, pos) • Accuracy • Absolute pressure read-out • Differential pressure • JT heat exchanger Pressure drop • Temperature sensors cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

  40. Status • Data analysis (Fermi) • Error analysis • Plot TTx151(Q), TTx251(Q) • Predictive model to improve • Wetted areas for various mass-flow analysis • Quality of the flow analysis (stratified) • Control investigation (CERN) • Measurements at 19 mbar (CERN) • Measurement for another Ultimate Condition (CERN) http://www-bdcryo.fnal.gov/darve/heat_exchanger/instrumentation.html cd-08/29/00 US-IT-HXTU - Test Run at CERN - 07/17 to 08/02

More Related