2. FPix Cooling Circuit

3. FPix Shared HD - Nominal Flow
ΔPtotal = 5bar
Δm = 0.5g/s
mnominal = 2.6g/s
ΔPtotal = 10bar
Δm = 0.2g/s
mnominal = 2.2g/s
FPix HD evaporators in series configuration.
Inlet capillaries sized for 10bar show less flow variation when the other parallel HD is switched off.
Flow varies from 2 to 2.4g/s due to heat load differences between parallel loops.
Inlet capillary used has 0.8mm ID and 2m length but can be sized according to the available space.
Based on the results, the total mass flow consumed by FPix is foreseen to be 30g/s.

4. Inlet capillary: ID=0.8mm Low margin wrt Dryout at maximum power
FPix HD Tube ID 1.3mm
Tmax = -12°C
Inlet capillary: ID=0.8mm
L=1.42m
DC-DC Converter + PC
Half Disk
Boiling trigger
Low margin wrt Dryout at maximum power

5. FPix HD Tube ID 1.4mm (baseline)
Tmax = -13.5°C
Inlet capillary: ID=0.8mm
L=1.75m
DC-DC Converter + PC
Half Disk
Good transition to boiling
Ideal 2-Phase flow regime and good margin wrt Dryout

6. Inlet capillary: ID=0.8mm Optimum performance and large safety margin
FPix HD Tube ID 1.6mm
Tmax = -15.5°C
Inlet capillary: ID=0.8mm
L=2.08m
DC-DC Converter + PC
Half Disk
Perfect transition
Optimum performance and large safety margin

7. Inlet capillary: ID=0.8mm
FPix HD at 15°C and Ready for Data
Tmax = 17.3°C
HD 1.4mm ID
Inlet capillary: ID=0.8mm
L=1.75m
DC-DC Converter + PC
Half Disk
Small safety margin

8. BPix Parallel Loops Mockup
Full -Z Layer #4 Circuit
DAQ System Panels
BPix –Z Layer 4# complete cooling circuit, all 4 parallel loops.
Mockup designed and built to investigate the flow behavior of parallel loops under heat load imbalance conditions.
Development of LabView integration together with MatLab and Refprop to be able to measure individual loop mass flow by using differential pressure across each inlet capillary.

9. BPix Flow Distribution Mockup
Full -Z Layer #4 Circuit assembled at B158
BPIX
DC-DC and PC
Inlet Manifold and Capillary Area
Outlet Manifold
PT100
Instrumentation
Ω Heating Method

10. YBO CO2 Transfer Line Sizing
Concentric Tube HEX Transfer Line
30m line results into ΔPmax = 0.45bar ≈ 1°C
Assembly example, tube length not to scale
The CO2 transfer line regulates the detector inlet liquid temperature via internal heat exchange with the detector’s returning flow.
Max required mass flow up to 10g/s at main transfer line from manifold to PP0.
2-Phase pressure drop models indicate a loss of 1°C.
16m experimental setup is being built at B158 to verify.
Pixel Nominal Conditions