1 / 16

C3F8 cooling @ NIKHEF

C3F8 cooling @ NIKHEF. Design Compare Does it work?. Two-stage cooling. Standard cooling C3F8 coolant only Dual-system @ NIKHEF: R404A primary coolant C3F8 secondary coolant Cheap & easy …….. Do not need oil-less compressor. FRONT VIEW. REAR VIEW. snoop. P sensors. T sensors.

marva
Télécharger la présentation

C3F8 cooling @ NIKHEF

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. C3F8 cooling @ NIKHEF Design Compare Does it work? Auke-Pieter Colijn

  2. Two-stage cooling • Standard cooling • C3F8 coolant only • Dual-system @ NIKHEF: • R404A primary coolant • C3F8 secondary coolant • Cheap & easy …….. • Do not need oil-less compressor Auke-Pieter Colijn

  3. FRONT VIEW REAR VIEW Auke-Pieter Colijn

  4. snoop P sensors T sensors Freon “doggy” My favorite tools Auke-Pieter Colijn

  5. Pressure control Main evaporator Expansion valves T sensor Hot gas bypass T sensor Sub-cooler Compressor H2O condenser R404A 1) Regulate C3F8 T with R404A evaporator P 2) Expansion valves regulate P [0-3kW@-25C] 3) Explain sub-cooler in a bit Auke-Pieter Colijn

  6. A-B: Compress R404A B-C: Liquefy hot gas in H2O condenser C-D: R404A expansion D-A: Evaporate R404A. Heat is absorbed from C3F8 LIQUID B C P [bar] A D GAS+LIQUID GAS Enthalpy [J/g] • dH = dQ • P = flow*dH Primary cooling: R404A Auke-Pieter Colijn

  7. C3F8 system for Testbox Main evaporator= C3F8 condenser C3F8 10-12 bar P control HEAT LOAD a.k.a. detector R404A C3F8 Sub-cooler Restrictors R404A Pump Can adjust C3F8 flow! Auke-Pieter Colijn

  8. LIQUID D C B P [bar] • A-B: compression • B-C: condensing • C-D: sub-cooling w. heat exchanger on outlet • D-E: expansion • E-A: absorb heat from detector (+ sub-cool inlet) E A GAS+LIQUID GAS C3F8 Cooling@CERN Enthalpy [J/g] Auke-Pieter Colijn

  9. LIQUID • A-B: condensing • B-C: sub-cooling • C-D: pump to 12bar • D-E: expansion • E-A: absorb heat from detector D P [bar] E C A B What is BAD about point E? GAS+LIQUID GAS Enthalpy [J/g] C3F8 Cooling@NIKHEF Auke-Pieter Colijn

  10. LIQUID D E • A-B: condensing • B-C: sub-cooling • C-D: pump to 12bar • D-E: heating • E-F: expansion • F-A: absorb heat F P [bar] A C B GAS+LIQUID GAS Enthalpy [J/g] C3F8 Cooling@NIKHEF Auke-Pieter Colijn

  11. Run it! Auke-Pieter Colijn

  12. Start-up Run Warm-up • I want -10C, I get -10C • Need to study fluctuations Run: Temperature Auke-Pieter Colijn

  13. Start-up Run Warm-up Inlet pressure = 11bar Return pressure = 2.8bar = -10 C Run: Pressure Auke-Pieter Colijn

  14. Start-up problems • Lots of leaks • Broken R404A expansion valve • Controller (unwired) • Cooling water stability • No manual: safety/operations Auke-Pieter Colijn

  15. To do • Adjust controller: limit temperature fluctuations • Adjust pressure: 12 bar C3F8 • Adjust flow: each disk circuit • New pump: need one without leaks • Heater element: avoid sub-cooled cooling Auke-Pieter Colijn

  16. Summary • Cooling plant @ NIKHEF • Different design • Works • Make final adjustment Auke-Pieter Colijn

More Related