Water Cooling Design of PETRA3

20. April 2004 Aldo Wanning - MKK 2 - 1

Water Cooling Workshop at DESY

Water Cooling Design of PETRA III

20. April 2004 Aldo Wanning - MKK 2 - 2

Directory• PETRA III project• Conversion from PETRA II to PETRA III• Requirements for the Water Cooling Systems• Cooling Capacity• Hybrid Dry Cooler• Water Treatment and Purification• Magnet Cooling Design• RF Cooling Design• New Installation in the Tunnel and Experimental Hall

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PETRA hall NE

PETRA hall E

The PETRA III Project

Water Cooling Workshop

new experimental hall

old seven octants

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View into the PETRA Tunnel

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View under the Magnets

busbars Al

water pipes Al

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Conversion from PETRA II to PETRA III

• PETRA II is an electron and proton booster for HERA• Cut-off of HERA in July 2007• PETRA III will be an x-ray source of the 3rd generation• 6 GeV energy and 2300 m circumference• 300 m of the tunnel will be dismantled and replaced by new

experimental hall• Building of an experimental hall of 250 m length

with 13-15 measuring stations

Schedule:• 15 month construction time, July 2007 – September 2008• 3 month commissioning time, October – December 2008• January 2009 start of the synchrotron radiation run

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Overview of the cooling water supply

damping wigglers

Experimental hall

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Water Cooling System

• 2 locations for the water cooling supply• PETRA Hall NE:

• Magnet cooling, chilled water production and cooling water supply for the experimental hall

• RF- cooling at PETRA Hall S• 2 separate water circuits:

one for aluminum and one for copper magnet coils• Hybrid dry air coolers are foreseen for recooling

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Requirements for the Water Cooling System

• Temperatures of the cooling water• Return line from cooling towers 28°C• Input line to the tunnel 30°C ± 0,1°C (3-way-valve)• Input line to experiment 20°C ± 0,1°C (3-way-valve)• Return line from tunnel 60°C

• Pressure• Input line 7 bar• Return line 2 bar

• Chilled water• Temperature 6°C

• Conductivity of the deionised water < 1µS/cm

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Cooling Capacity

PETRA S Copper cicuit RF-System 5.400 kW

PETRA NE Aluminum Curcuit magnets 1.500 kWCoolin water

copper circuit damping wigglers, new magnets,undulators, 2.800 kWpower supplies, air conditioning

Chilled water copper circuit air conditioning in experimental hall 840 kWair conditioning in experimental huts 250 kWelektronic racks 450 kWLabs, offices 300 kW

11.540 kW

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Hybrid Dry Cooler

• Hybrid dry coolers are used to cool liquid media in closed circuits.

• During the cold seasons the cooling is done by means of ambient air

• During the summer the cooling effect is forced by evaporation of water

• The evaporation cooling allows to cool down under the temperature of the ambient air

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Scheme of a hybrid dry cooling tower

1 Primary cooling circuit

2 Input from the heat source

3 Finned cooling elements

4 Output to the heat source

5 Heat source

6 Cooling water pump

7 Moistening water circuit

8 Additive water

9 Water collecting tank

10 Outlet

11 Cooling air

12 Fan

13 Fan motor

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Hybrid Cooling Tower

• Advantages• Minimal additive water consumption• Low power consumption• Low installation height• No clouding over the whole year• Saving of water resources

• Disadvantages• Higher construction coast• Longer amortization time

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Water Treatment of PETRA III

• Well water softening, max. 14 m³/h• 70 kg consumption of salt per regeneration, once a week• Reverse osmosis for deionised water• Permeat output of 8 m³/h, conductivity < 10 µS/cm• Permeat collecting tank of 20 m³• Additive water for moistening the finned cooling elements • Conductivity of the additive water: <10 µS/cm• Regeneration of the circulation water by means of

demineralization cartridges, conductivity < 1µS/cm

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Scheme of Water Treatment

1

2 3 4

6

4

1 Well water

2 Well water softening 3 Reverse osmosis4 Permeat collecting tank 5 Additive water for

cooling tower

6 Deminiralization cartridge

7 Waste water

5

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Magnet Cooling in the old Octants

• 7 octants are unchanged, so called old octants• Synchrotron radiation power is 100 W/m• Requirements for high alignment stability:

< 2 °C temperature rise over the vacuum chamber• Solution:

at first the cooling water flows into the vacuum chamber and than it is distributed into the dipole, quadruple and sextuple

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Scheme of Magnet Cooling Circuit

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RF Water Cooling System

• 2 RF-Systems at 2 halls, hall SR + hall SL• The cooling water supply is located at hall SR• At first the cooling water flow through the

cavities and absorbers in the tunnel• Afterwards the cooling water is distributed to

both klystron-halls• The circulators get constant 30°C cooling water

input from temperature buffer tanks • During shut down the tanks are electric heated

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Scheme of RF Cooling System

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View into the PETRA III Tunnel

busbars, air cooled

water pipes, stainless steel

magnet

vacuum chamber

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View into the new Experimental Hall

PETRA III Tunnel

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Nature above PETRA

Thank you for your attention

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