1. 110 th November 2010EN/CV/DC Detector Cooling Project - advancement status of Work Package N3 Thermosiphon project Michele Battistin 18 May 2011

2. 210 th November 2010EN/CV/DC Index Introduction Basic design Chiller Condenser Piping installation and integration Risk Assessment and definition Other tasks: control, infrastructures Planning Conclusion

3. 310 th November 2010EN/CV/DC Introduction The Thermosiphon project started in March 2009 Objective: consolidate the ATLAS ID evaporative station Milestones achieved Mini-Thermosiphon Preliminary study and tests 2kW Thermosiphon Design Purchase Control Construction * Perform tests Full Scale Thermosiphon Basic design and technical note Integration Cost estimation Planning and organization of piping work Chiller purchase process Pipes calculation and integration Condenser purchase process Detailed design and selection of components

4. 410 th November 2010EN/CV/DC Basic design The Thermosyphon is the baseline solution for the consolidation of the ATLAS ID evaporative cooling system. The main design parameters are: – Detector cooling Power: 60 kW @ -25 °C. – Pressure and temperature at the rack: 500 mbar, 20 C. – Flow at full power: 1.2 kg/s. The present compressor system will remain as full power back up cooling source.

5. 510 th November 2010EN/CV/DC Thermodynamic Cycle: P-h diagram

6. 610 th November 2010EN/CV/DC Full Scale Thermosiphon P&ID Brine Circuit Chillers Thermosyphon Circuit

7. 710 th November 2010EN/CV/DC TS Brine Low T Chiller 7 The fridge cascade Primary Water 25°C Cooling source is the primary water coming form the cooling towers: ≈25 °C Two fridge systems in cascade take the temperature to -70 °C. The first stage uses R404a and the second stage R23. The second stage cools down a C 6 F 14 liquid brine circuit used to condensate the C 3 F 8 in the condenser of the thermo siphon circuit. First Chiller (R404a) Second Chiller (R23) -30°C-70°C -67°C Condenser Liquid receiver Brine (C 6 F 14 )

8. 810 th November 2010EN/CV/DC Chiller Purchase Requested configurations: – Option 1: Three 50% duty chillers (one air cooled). – Option 2: One 100% duty Chiller (with redundancy on the compressors) plus 2 chillers at 50% duty (one air cooled). Result from the Invitation to Tender: – Best offer from J&E Hall (on both configurations). – New configuration proposed (by CERN and J&E Hall): 2x Chillers 100% duty for same price of 3x 50% duty. Purchase procedure definition: – Purchase of one 100% duty Chiller now and the redundant unit later.

9. 910 th November 2010EN/CV/DC Redundancy and emergency strategy C3F8 condenser 180 kW -70 °C liquid tank USA15 cavern Surface C6F14 brine circuit Primary water 25°C First 100% power Chiller First cycle for Emergency diesel powered Second 100% power Chiller First cycle for Emergency Diesel powered Air cooled ATLAS ID Detector UX15 cavern Back-up 50 kW -20 °C Brine circuit Redundant pumps

10. 1010 th November 2010EN/CV/DC Chiller Characteristics J&E Hall Chiller characteristics: – Design duty: 191.6kW @ -70°C. 2-stages: R404a (high temperature) and R23 (low temperature). – Stage 1 (R404a): 300 kW @ -25°C (COP=2.08); Equipped with an air cooled condenser sized for warm operation (60 kW of cooling power). – Stage 2 (R23): 192 kW @ -70°C (COP=1.29). Overall COP = 0.66 – Requirement of electrical power: 144+149 = 293 kW. – Required water from cooling towers: 84,000 kg/h. – Location requirements: Size: 11x2.75x3m (length, width, and height). Weight: < 15,000 kg.

11. 1110 th November 2010EN/CV/DC Chiller Integration The planned position for chillers and brine pumps circuit has to be redefined due to future upgrades of the cooling towers. New position to be defined.

12. 1210 th November 2010EN/CV/DC Condenser Purchase & Integration The DO has been sent: waiting for offers. The condenser will be placed on the roof of building XXX. – The triangular support structure is being designed by EN/MME.

13. 1310 th November 2010EN/CV/DC Pipes & Supports Integration Layout of pipes and supports by A. Bitadze (3DModel Number : ST0322617_01). Calculations for the defined pipe routing and its supports with seismic analyses by EN/MME. Calculations to be sent to PROGEPI (Iniziative Industriali) for verifications and design of supports. Pipes have been bought, cleaned, and are ready to install.

14. 1410 th November 2010EN/CV/DC Risk Assessment and definition The first version Risk Assessment and Definition was done by L. Zwalinski. The document is being reviewed and updated (dependent on the selected components and final version of the P&ID).

15. 1510 th November 2010EN/CV/DC ATLAS reviewing process Pre-design and general lines of the project. Indico agenda and documents here.here 1 st Thermosiphon review: 6 th July 2009 Detailed design for the 2 kW Thermosiphon, mini-thermosiphon and blends. Indico agenda and documents here.here 2 nd Thermosiphon review: 1 st October 2009 Advancement status of Thermosiphon project, oil free centrifugal compressors and sonar sensor. Indico agenda and documents here.here 3 rd Thermosiphon review: 28 th May 2010 Project Readiness Review. Indico agenda and documents here.here 4 th Thermosiphon review: 19 th of November 2010

16. 1610 th November 2010EN/CV/DC Other tasks (in parallel) Control – UNICOS for the Thermosiphon and Chiller. – Draft for the functional analysis in progress. Infrastructure – Search for primary water for the chiller system (dependent on the chiller integration). – Upgrade of the electrical network for standard and diesel power supply (possible to connect to an existing EN/CV rack).

17. 1710 th November 2010EN/CV/DC Planning Time Autumn 2010Winter 2010/2011Spring 2011Summer 2011Autumn 2011Winter 2011/2012 Design and integration Complete basic design and integration Chiller system and brine circuit Invitation to tender process Award the contract Manufacture Supply and installation Tank/condenser Detailed design Demmande d’offre + purchase Manufacture Supply and installation C3F8 piping Supports and earthquake calculus Purchase of material Installation of the pipes By-pass Detailed designPurchase of materialInstallation in the cavern Instrumentation and control Functional analysis Purchase of hardware Programming Electricity and Pneumatic installations Study the requirements Improve UPS/Standard supply if needed Commissioning Tests with by- pass

18. 1810 th November 2010EN/CV/DC Conclusions The Mini-Thermosiphon has proved the working principle for the consolidation. The 2 kW Thermosiphon has been stopped by certification problems of the tank. It shall provide results to design the control of the final project. The Full Scale Thermosiphon is already well advanced – Basic design is done. – Purchase has started: Chiller was ordered. – DO for the condenser is launched (opening proposals the end of May). – Piping installation has been organized. – Component selection is ongoing.

19. 1910 th November 2010EN/CV/DC Thank you for your attention Any questions ? Any questions ?