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CO 2 Cooling Research @ IPNL

CO 2 Cooling Research @ IPNL. Nick Lumb, 28/01/09. Programme 2009. Jan – April: Build blow system based on NIKHEF / CERN design Cooling power ~144 W (PIX layer 1 circuit) May – Sept: Build re-circulating system based on VELO design Cooling power ~1 kW. Blow system – CERN design.

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CO 2 Cooling Research @ IPNL

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  1. CO2 Cooling Research @ IPNL Nick Lumb, 28/01/09

  2. Programme 2009 • Jan – April: Build blow system based on NIKHEF / CERN design • Cooling power ~144 W (PIX layer 1 circuit) • May – Sept: Build re-circulating system based on VELO design • Cooling power ~1 kW

  3. Blow system – CERN design

  4. Blow system – components (1) • Liquid CO2 bottle √ • Air Liquide, 50 l • Mass flow meter √ • Rheonik RHM 015 • Swagelok metering valve √ • To adjust the flow rate • Swagelok proportional relief valve √ • To adjust the back pressure (CO2 temp.) • Heat exchanger • Home built concentric tube, 2.8 m heat exchange length

  5. Blow system – components (2) • Julabo F32-EH chiller / heater √ • To heat CO2 to 30°C before venting • -35 to 150°C • 150W cooling power @ -20°C, 2kW heating power • Re-use in re-circulating system (accumulator) • Test capillary √ • To be provided by Hans • 1.5 mm o.d., 76 micron wall thickness • Contacts for low voltage current source (heating) • Pressure gauges √ • Commercial fridge (isolate test capillary from environment) √ • Temperature sensors + read-out √ • Miscellaneous Swagelok connectors √ • Pipe insulation √

  6. The 2-Phase Accumulator Controlled Loop (2PACL) Long distance P4-5 P7 5 Heat out Heat out Condenser 6 Heat in 4 Heat in 2 3 Heat exchanger 1 2-Phase Accumulator Restrictor Pump Re-circulating system B. Verlaat (NIKHEF)

  7. Main extra items needed beyond blow system • Gear pump • E.g. Gather type 1mx-x/12-11 • Minimum pulsing • Being tested by B. Verlaat • Condenser • Could re-use Louvain 2kW chiller • Re-use blow system heat exchanger? • Or buy one (SWEP B12H/1P-SC-U) • Two-phase accumulator • Re-use Julabo heater / cooler • Need to buy / make pressure vessel • Bart rule of thumb: pressure vessel 1.5 x volume of rest of system

  8. Re-use of concentric tube exchanger • Will blow system exchanger be big enough? • Heat transfer calcs for 2-phase flow not elementary! Excel sheet • For blow system, pipes 12x10 and 6x4, flow rate 1cc/s: can get away with length ~2m • For Louvain chiller: • Flow max. = 35 l/min. C6F14 • Require 1 kW cooling power at CO2 temp. -10°C • Assume chiller operates at -23°C • → Heat exchange length needed ~2.8m • Pressure drop (~2 bar) may be a problem

  9. Conclusion • Starting to build blow system • Hope to have it ready with full temperature read-out by end April • Will then build re-circulating system • Tool for testing heat transfer options for PIX and eventually Si strip tracker

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