Overview WG4 Meeting - 16th October 20121M. Gomez Marzoa, E. Da Riva Maximum ΔT admissible at cooling system T_1 T_2 T_1+0.5*ΔT Stave  If T_2 – T_1 =

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Presentation transcript:

Overview WG4 Meeting - 16th October 20121M. Gomez Marzoa, E. Da Riva Maximum ΔT admissible at cooling system T_1 T_2 T_1+0.5*ΔT Stave  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 20122M. Gomez Marzoa, E. Da Riva Maximum ΔT admissible at cooling system T_1 T_2 T_1+0.5*ΔT Stave  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 Overview

WG4 Meeting - 16th October 20123M. Gomez Marzoa, E. Da Riva Piping diameter for two-phase cooling system  Based on results obtained with D08 prototype and C 4 F 10, and using correlations to back up the ΔT Sat for the experienced Δp.  For given mass flow rate -> max. ΔT Sat -> max. Δp allowed -> Pipe D min  Pipe-refrigerant compatibility:  C 4 F 10 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. Overview

WG4 Meeting - 16th October 20124M. Gomez Marzoa, E. Da Riva Piping diameter for two-phase cooling system  Based on results obtained with D08 prototype and C 4 F 10, and using correlations to back up the ΔT Sat for the experienced Δp.  For given mass flow rate -> max. ΔT Sat -> max. Δp allowed -> Pipe D min  Pipe-refrigerant compatibility:  C 4 F 10 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. Overview To be done

ITS External Layers WG4 Meeting - 16th October 20125M. Gomez Marzoa, E. Da Riva  Preliminary estimations: based on the High Thermal Conductivity Plate design.  Parameters to define: D_pipe, plate thickness, material budget. D-pipe??

ITS External Layers WG4 Meeting - 16th October 20126M. Gomez Marzoa, E. Da Riva Inner layers Layer N staves [-] P min stave [W cm -2 ] P max stave [W cm -2 ] Chip surface [cm -2 ] N chips per stave [-] Min power per layer [W] Max power per layer [W] Outer layers Layer N staves [-] P min stave [W cm -2 ] P max stave [W cm -2 ] Chip surface [cm -2 ] N chips per stave [-] Min power per layer [W] Max power per layer [W] Inner layers Layer Min power per layer [W] Max power per layer [W] ΔT [K] m min stave [kg s-1] v [m s -1 ] D_pipe [mm] m max stave [kg s -1 ] v [m s -1 ] D_pipe [mm] Outer layers Layer Min power per layer [W] Max power per layer [W] ΔT [K] m min stave [kg s-1] v [m s -1 ] D_pipe [mm] m max stave [kg s -1 ] v [m s -1 ] D_pipe [mm] Power dissipation Pipe diameter estimation

ITS External Layers WG4 Meeting - 16th October 20127M. Gomez Marzoa, E. Da Riva Pressure drop estimation L4-L5 0.3 W cm -2 d_i [mm]m [l min -1 ]L [m]v [m s -1 ]ΔT in-out [K]ReΔp lam [bar]HTC (lam) [W m -2 K -1 ]ΔT wall-water [K] L6-L7 0.3 W cm -2 d_i [mm]m [l min -1 ]L [m]v [m s -1 ]ΔT in-out [K]ReΔp lam [bar]HTC (lam) [W m -2 K -1 ]ΔT wall-water [K] Single stave L6-L7 0.3W cm -2 30mm 1475mm W Single stave L4-L5 0.3W cm -2 30mm 843mm 75.87W

ITS External Layers WG4 Meeting - 16th October 20128M. Gomez Marzoa, E. Da Riva 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.

DSF water tests WG4 Meeting - 16th October 20129M. Gomez Marzoa, E. Da Riva 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.

DSF water tests WG4 Meeting - 16th October M. Gomez Marzoa, E. Da Riva 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