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M. Battistin (EN/CV/DC) 28 th May 2010

Detector Cooling Project III Thermosiphon Workshop - Conclusions. M. Battistin (EN/CV/DC) 28 th May 2010. Workshop Index. Advancement of sonar fluorocarbon mixture analyzer for C2F6/C3F8 evaporative cooling development Results from the Mini-Thermosiphon tests

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M. Battistin (EN/CV/DC) 28 th May 2010

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  1. Detector Cooling Project III Thermosiphon Workshop-Conclusions M. Battistin (EN/CV/DC)28th May 2010

  2. Workshop Index • Advancement of sonar fluorocarbon mixture analyzer for C2F6/C3F8 evaporative cooling development • Results from the Mini-Thermosiphon tests • Status of the PX15 thermosiphon project • Seismic calculation for the PX15 piping • System integration in PX15  • Thermosiphon control system • Test plan for the PX15 thermosiphon • Issues related to the 60 kW installation scale up and blends management • Low temperature chillers Market Survey MS-3684/EN/ATLAS • Thermosiphon solution for Alice SPD cooling system • Back-up solutions to the ATLAS ID Thermosiphon: centrifugal compressors

  3. The thermosiphon solution Low temperature Chiller condenser • The mini-thermosiphon test bench has provided full results. • The full scale test bench in PX15 is under construction and will allow the complete qualification of the solution. • We need to understand if we what just replace the present compressors leaving unchanged the evaporation temperature or even decrease the evaporation temperature of 5, 10 or 13 K ????? • Piping in PX15 (DN100 and DN40) will be part of the solution. liquid tank pneumatic valve Surface pneumatic valve USA15 others manual valve 4 liquid lines PR Heater thermal screen USA15 UX15 dummy load pixel manual valve 4 gas lines 6 X SCT BPR manual valve 15th April 2010

  4. The pump is not a reasonable solution Low temperature Chiller • Installing two redundant pumps on the liquid line in the cavern is possible but: • Low temperature (cryogenic) pump • Why having active machine in a system that could avoid them (maintenance, radioactive fluid, etc.) • There is no space for a low temperature chiller underground: connecting pipes shall be installed anyway. Surface pneumatic valve USA15 others manual valve 4 liquid lines PR Heater liquid tank condenser thermal screen USA15 UX15 dummy load pixel manual valve 4 gas lines 6 X SCT BPR manual valve 15th April 2010

  5. The Turbocor solution lay-out condenser • Once the solution will be qualified and accepted the gas shall be condensed on the surface (7 bara – 15 °C) • Standard and cheaper chiller (0°C) will be sufficient. • Piping in PX15 (DN100 and DN40) will be part of the solution. Standard Chiller liquid tank pneumatic valve Surface pneumatic valve USA15 others manual valve 4 liquid lines PR Heater thermal screen USA15 UX15 dummy load pixel manual valve 4 gas lines 6 X SCT BPR manual valve 15th April 2010

  6. Is there any back-up solution? condenser • In the case no alternative solution is sufficiently attractive to replace the present compressors… we have to keep them. • In this case we can use them at lower pressure (8 bar instead of 15 bar) and condensate again on the surface. • This should increase the lifetime of the present compressors. • Piping in PX15 (DN100 and DN40) will be part of the solution. • The old tank of the evaporative replaced last year can be reused. Standard Chiller Or Chilled Water liquid tank pneumatic valve Surface pneumatic valve USA15 others manual valve 4 liquid lines PR Heater thermal screen USA15 UX15 dummy load pixel manual valve 7Haug compressors 4 gas lines 6 X SCT BPR manual valve 15th April 2010

  7. Piping between USA15 and SDX1 condenser • The three solutions: • Turbocor centrifugal compressors • Thermosiphon no compressor • Haug low pressure compressors • Require the interconnecting piping between the compressor room and the surface building for the full flow-rate. • EN/MME is available for the installation in the second part of the year only. In 2011 they will start the preparation works for the long shutdown. liquid tank pneumatic valve Surface pneumatic valve USA15 others manual valve 4 liquid lines PR Heater thermal screen USA15 UX15 dummy load pixel manual valve 7Haug compressors 4 gas lines 6 X SCT BPR manual valve 15th April 2010

  8. Conclusions • In case of failure of the validation process, the present compressor could be run a very lower power to reduce the risk of failure: the piping connecting USA15 to the surface are needed anyway. • New resources are needed to follow these projects.

  9. General Conclusions • Mini-thermosiphon tests showed that the thermosiphon is a valid technology to replace the compressors in the ATLAS ID and ALICE SPD cooling systems. • Fully validation will be achieved with PX15 TSP test bench. • Centrifugal oil free compressors of new generation can provide a valid alternative to the present compressors or thermosiphon. • The validation process of these compressors is full of obstacles. • We need to specify what we want as minimal evaporation temperature using pure C3F8 and with blends. • By the end of the year we shall be ready to identify and finance the alternative solution to the present system. • In case of failure of the validation process, the present compressors could run at lower pressure to reduce the risk of failure and increase their lifetime • The piping connecting USA15 to the surface are needed anyway. • New resources are needed to follow these projects. We ask ATLAS to finance them.

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