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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 on theme: "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 ="— Presentation transcript:

1 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.

2 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

3 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

4 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

5 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??

6 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] 1100.30.54.58.74118197 2140.30.54.58.74165275 3180.30.54.58.74212354 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] 4480.30.54.556.2036426070 5520.30.54.556.2039456575 6960.30.54.598.331274421240 71020.30.54.598.331354022568 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] 1 118197 30.000940.51.550.001560.52.00 2 165275 30.000940.51.550.001560.52.00 3 212354 30.000940.51.550.001560.52.00 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] 4 36426070 30.006040.53.920.010060.55.06 5 39456575 30.006040.53.920.010060.55.06 6 1274421240 30.010560.55.190.017610.56.70 7 1354022568 30.010560.55.190.017610.56.70 Power dissipation Pipe diameter estimation

7 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] 40.301.6860.403.613990.0155396.6 40.361.6860.483.016790.0185396.6 40.421.6860.562.619590.0215396.6 50.301.6860.253.611190.0064316.6 50.361.6860.313.013430.0084316.6 50.421.6860.362.615670.0094316.6 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] 40.302.9500.406.313990.0275396.6 40.362.9500.485.316790.0325396.6 40.422.9500.564.519590.0375396.6 50.302.9500.256.311190.0114316.6 50.362.9500.315.313430.0134316.6 50.602.9500.513.222390.0224316.6 Single stave L6-L7 0.3W cm -2 30mm 1475mm 132.75W Single stave L4-L5 0.3W cm -2 30mm 843mm 75.87W

8 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.

9 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.

10 DSF water tests WG4 Meeting - 16th October 201210M. 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

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