1 / 10

Overview

Overview. Maximum Δ T admissible at cooling system. T_1. T_1+0.5* Δ T. Stave. T_2. If T_2 – T_1 = 6 K, the maximum Δ T at the stave would be 0.5*(T_2-T_1) = 3 K In the prototypes tested up to now, Δ T in the water maximum was 3 K

lorand
Télécharger la présentation

Overview

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. Overview Maximum ΔT admissible at cooling system T_1 T_1+0.5*ΔT Stave T_2 • If T_2 – T_1 = 6 K, the maximum ΔT at the stave would be 0.5*(T_2-T_1) = 3 K • In the prototypes tested up to now, ΔT in the water maximum was 3 K • A smaller flow rate can be set at the prototype for the configuration above. Pipe erosion considerations • Usually, two fluid velocities are important: • Minimum velocity: avoids depositions inside the piping. • Maximum velocity: avoids failure by pipe erosion throughout piping lifetime. • The manufacturer should provide the operating conditions. • A definitive choice of pipe must be done. WG4 Meeting - 16th October 2012

  2. Overview Maximum ΔT admissible at cooling system T_1 T_1+0.5*ΔT Stave T_2 • If T_2 – T_1 = 6 K, the maximum ΔT at the stave would be 0.5*(T_2-T_1) = 3 K • In the prototypes tested up to now, ΔT in the water maximum was 3 K • A smaller flow rate can be set at the prototype for the configuration above. Pipe erosion considerations • Usually, two fluid velocities are important: • Minimum velocity: avoids depositions inside the piping. • Maximum velocity: avoids failure by pipe erosion throughout piping lifetime. • The manufacturer should provide the operating conditions. • A definitive choice of pipe must be done. To be done WG4 Meeting - 16th October 2012

  3. Overview Piping diameter for two-phase cooling system • Based on results obtained with D08 prototype and C4F10, and using correlations to back up the ΔTSat for the experienced Δp. • For given mass flow rate -> max. ΔTSat-> max. Δp allowed -> Pipe Dmin • Pipe-refrigerant compatibility: • C4F10 is not compatible with the PTFE (Teflon) pipe that has been ordered to avoid the connection at the the turn of the cooling pipe. • Detector Cooling database provides information on this subject. Material budget considerations • Prototype thermal optimization done. • Precise calculation of the local and average material budget for the present and optimized prototypes would help optimizing from material budget viewpoint. • Estimation important for the prototypes at the outer layers. WG4 Meeting - 16th October 2012

  4. Overview Piping diameter for two-phase cooling system • Based on results obtained with D08 prototype and C4F10, and using correlations to back up the ΔTSat for the experienced Δp. • For given mass flow rate -> max. ΔTSat-> max. Δp allowed -> Pipe Dmin • Pipe-refrigerant compatibility: • C4F10 is not compatible with the PTFE (Teflon) pipe that has been ordered to avoid the connection at the the turn of the cooling pipe. • Detector Cooling database provides information on this subject. To be done Material budget considerations • Prototype thermal optimization done. • Precise calculation of the local and average material budget for the present and optimized prototypes would help optimizing from material budget viewpoint. • Estimation important for the prototypes at the outer layers. To be done WG4 Meeting - 16th October 2012

  5. ITS External Layers • Preliminary estimations: based on the High Thermal Conductivity Plate design. D-pipe?? • Parameters to define: D_pipe, plate thickness, material budget. WG4 Meeting - 16th October 2012

  6. ITS External Layers Power dissipation Pipe diameter estimation WG4 Meeting - 16th October 2012

  7. ITS External Layers Pressure drop estimation WG4 Meeting - 16th October 2012

  8. ITS External Layers Mechanical constraints • Option A: stave is a full module. • Sag can be a problem: L4-5 -> 843 mm; L6-7 -> 1475 mm long • Manufacturing? • Option B: stave composed by multiple modules. • Need connections for piping and supports along the stave. • Bigger material budget? Leaks? • Mechanical constraints seem tighter than the cooling requirements. WG4 Meeting - 16th October 2012

  9. DSF water tests Circuit status • By-pass made to increase the demand of water at our output and prevent pressure oscillations (needs optimization). • Pressure fluctuations at the inlet not suppressed so far: • Agree with other users of water circuit on a schedule? • Use independent plant (TRD Cuvee, ATLAS Julabo). Prototype tests: status • Wound-truss structure with 0.1 mm thick carbon fiber (D10): tests undergoing. • HTC Plate structure (D11): heater not glued yet • Similar to D06 prototype (performed under 30 °C) • Essential to fully understand and characterize the behavior of this solution. WG4 Meeting - 16th October 2012

  10. DSF water tests Circuit status • By-pass made to increase the demand of water at our output and prevent pressure oscillations (needs optimization). • Pressure fluctuations at the inlet not suppressed so far: • Agree with other users of water circuit on a schedule? • Use independent plant (TRD Cuvee, ATLAS Julabo). Prototype tests: status • Wound-truss structure with 0.1 mm thick carbon fiber (D10): tests undergoing. • HTC Plate structure (D11): heater not glued yet • Similar to D06 prototype (performed under 30 °C) • Essential to fully understand and characterize the behavior of this solution. To be done WG4 Meeting - 16th October 2012

More Related