co 2 as a potential cooling medium
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CO 2 as a potential cooling medium. for detector cooling at CERN. Abstract:. Project conception CO 2 overview Reverse Rankine Cycle Components Calculations / dimensioning Heat transmission Perspective. Project conception. Project definition. Today’s state of the art - PowerPoint PPT PresentationTRANSCRIPT
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CO2 as a potential cooling medium
for detector cooling at CERN
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Abstract:
Project conception
CO2 overview
Reverse Rankine Cycle
Components
Calculations / dimensioning
Heat transmission
Perspective
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Project definition
Today’s state of the art
Existing applications and look for trends
CO2 as cooling medium
Laboratory and test facility design
Correlations for CERN
Project conception
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Project structureProject conception
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
TimetableProject conception
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
CO2 overview
CO2 sublimates under ambient pressure direct from solid to steam
and reaches a temperature of -78,5°C.
CO2 is color- and odorless, good soluble in water and not soluble
with mineral oil.
CO2 has a critical point at 31,06°C and 73,83 bar.
CO2 is non flammable, non explosive, non corrosive and does not
corrode sealant and lubricant.
30vol.% (300'000 ppm) of CO2 in the air are lethal.
CO2 overview
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Reverse Rankine Cycle
Reverse Rankine Cycle
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Components of the laboratory CO2 cycle
Compressor (Bock)
Expansion valve
Condenser Evaporator
Components
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
CO2 compressor
Technical data: 2-cylinder, semi-hermetic compressor
Limitation of use:
Operation point: Condensing temperature: 0°C
Evaporation temperature: -40°C
Cooling capacity at operation point: 6058 W
Attachment: continuous speed control
Components
HGX12P/60-4 CO2
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Components
Condenser
Evaporator
Throttle valve
Reservoir
All elements will be appointed over one company.
Components
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
CO2 Reverse Rankine Cycle in the T,s-diagram
Calculation / dimensioning
1-2: Isentropic compaction
2-3: Isobar condensation
3-4: Isenthalpe choke
4-1: Isobar evaporation
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Calculation result
Input based on operation point:
Cooling capacity 6058 W
Isentrope efficiency 49%
Evaporation temperature -40°C
Condensing temperature 0°CCalculation / dimensioning
CO2 Reverse Rankine Cycle 1 – 2 – 3 – 4 1 – 2‘ – 3 – 4 1 – 2“ – 3 – 4
Mass flow 25,78 g/sec 25,74 g/sec 25,74 g/sec
Rejected heat flow -7476 W -8226 W -8952 W
Compressor power consumption
1418 W 2890 W 2890 W
Coefficient of performance 4,272 2,1 2,1
It is a obvious difference to the ideal process expected.
The compressor don’t work isentropic.
The condenser has to provide a minimum heat flow of 9 kW.
The evaporator has to provide a minimum heat flow of 6,5 kW.
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Detector cooling with CO2 cycle
Pilot study
Test state
• Liquid CO2 through thin and heated capillary tubes
• Measuring of heat transmission characteristics
Identify the formula coherences
Correlate formula with the measured data
Heat transmission
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Flow Boiling
Heat transmission
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Correlations
Heat transmission separated into two independent rates:
Convective Heat transmission heat transmission in nucleate boiling
Heat transmission(z)αk (z)αB
α(z)
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Yoon
Horizontal microtubes Critical quality
Constant heat flux
below xcr above xcr
4,71,642,12Lcr,t BdBo)(1000Re38,27x
2B
2K )α(S)α(Eα
π
π
2
α)θ(2αθα wetdryGdry
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Steiner - Horizontal
Horizontal thick-walled tubes
Constant heat flux
Start of nucleate boiling:
3 3B
3K α(z)α(z)α(z)
vGk
L0Sonb
Δhρr
ασT2q
onbqq onbqq
Kαα(z)
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
18
• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Steiner - Horizontal
Convective
Nucleate boiling
Heat transmission
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Steiner - Vertical
Heat transmission
Convective
Nucleate boiling
no mass flux
no quality
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Steffen Grohmann – Horizontal microtubes
Working fluid: Argon
No mass flux and quality dependence in microtubes
Strong influence of surface tension in microtubes
Phase seperation occures less likely
αB based on VDI-Wärmeatlas correlations for vertical tubes
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Options for future work
Perspective
Ordering the components (condenser, evaporator).
Setup and launch of the cooling machine in the laboratory.
Tests regarding the heat transmission and conventional
cycle.
Calculation of the cycle based on the measured data.
Optimization of the cooling machine.
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16.01.2009Project Tutor: Prof. Dr.-Ing. W. Czarnetzki M. Renner, S. Erhardt, S. Feghelm, J. Bürkle
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• Project conception
• CO2 overview
• Reverse Rankine Cycle
• Components
• Calculations /dimensioning
• Heat transmission
• Perspective
CO2 as a potential cooling medium for detector cooling at CERN
Future collaboration with CERN
Experiments on heat transmission:
with several tubes types
in a evaporation temperature range from -25°C to -50°C
in a pressure range from 7bar to 40bar
Correlation of the measurements Perspective