1 / 10

# Overview - PowerPoint PPT Presentation

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

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Overview' - lorand

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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

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

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

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

• 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

Power dissipation

Pipe diameter estimation

WG4 Meeting - 16th October 2012

Pressure drop estimation

WG4 Meeting - 16th October 2012

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

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

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