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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

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Overview

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


Overview1

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


Overview2

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


Overview3

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


Its external layers

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


Its external layers1

ITS External Layers

Power dissipation

Pipe diameter estimation

WG4 Meeting - 16th October 2012


Its external layers2

ITS External Layers

Pressure drop estimation

WG4 Meeting - 16th October 2012


Its external layers3

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


Dsf water tests

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


Dsf water tests1

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


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