C ONCENTRIC TUBE H EAT EXCHANGER TEST SETUP AT C RYOLAB CO2 FOR CMS T RACKER WEEK MEETING. Theodoros Katopodis PH-CMX

CONCENTRIC TUBE HEAT EXCHANGER TEST SETUP AT CRYOLAB

CO2 FOR CMS TRACKER WEEK MEETING.

Theodoros Katopodis PH-CMX

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CTHX PIPE TESTS CO2 FOR CMS TRACKER WEEK MEETING

A. CTHX theoretical considerations.

B. Cryolab’s restrictions and interior design.

C. Designing approach by using Catia.i. 3D models.ii. 2D models

D. CTHX construction procedure.i. Welding/Bending/Insulation at Gasgroup.ii. Transportation at Cryolab.iii. Insulation.

E. CTHX insulation.

F. CTHX installation.

G. Future tasks.

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The concentric tube heat exchanger consists of two tubes that are concentrically arranged. One of the fluid (either hot or cold fluid) flows through the tube and the other through the annulus.

Heat is a form of energy that flows due to difference in temperature between two points that are located within a medium or in two different media. The transfer of heat occurs via one or any combination of the three modes of heat transfer - conduction, convection and radiation.

Similarly, the rate of heat transfer can be described by the following equations:

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A simplified representation of heat transfer between two fluids through the walls of a CTHX .

The new CTHX is made of stainless steel in a two layers of insulation, trying to improve the system performance, reaching stable conditions : Tsupply=-40°C and Treturn=-20°C.

The CTHX will be tested at Cryolab (connected from the one side (cooling plant) directly to the other (four Loops mockup of Joao’s tests).

CTHX theoretical considerations.

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Cryolab’s restrictions and interior design.

Cryolab building 158 view before the removal of the scaffolding.

No space at all!!

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The most candidate place where we could install the concentric tube pipes.

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Cryolab building 158 view after the removal of the scaffolding .

Cooling Box (CMS 4 Layer mockup)

Cooling Plant

Horizontal P

ath

Vertic

al P

ath

5m

4m

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The plan is to represent in a 3D simple drawing model the room space of Cryolab more or less precisely . 5

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3D models

3D_Assembly connection between Cooling plant and CTHX.

3D_Cryolab room place.

3D_The CTHX.

3D_The CTHX view.


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32D models

2D_Views of the CTHX.

2D_Assembly connection between Cooling plant and CTHX.

o Concentric Stainless Steel Tube i. Inside Tube ID=4mm and OD=6mm.ii. Outside Tube ID=10mm and

OD=12mm.

2D_ISO view of the CTHX.


o Armaflex Insulationi. First Layer ID=12mm and OD=35mm.ii. Second layer ID=35mm and

OD=100mm.

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Tubes arrived at CERN in bunches of 6m.

i. ID= 4mm and OD= 6mm (3x6m).

ii. ID= 10mm and OD= 12mm (3x6m).

Construction process Welding process (by using the orbital welding-a specialized area of welding whereby the

arc is rotated mechanically through 360° around a static work piece, an object such as a pipe, in a continuous process).

Small tube is placed inside the big. Cross unions tees were installed to the

marked points (where it is supposed to be located the PPT).

Subsequently the two tubes bended together ( by using the hand tube bender to different 6 points following a bend radius of 38 °).

Before the transportation the CTHX was insulated (by using the thin insulation of ID=12mm and OD=35mm).

Afterwards the 18m CTHX transported at Cryolab, in order to be adjusted on the correct position.

Holes opened on the wall (for the vertical path). Supporting brackets fixed on the wall, holding stable the CTHX to the horizontal path. Insulate the CTHX with the second layer of Armaflex ID=35mm and thickness of 32mm. Pressure transmitters installed.


CTHX construction procedure.

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During the construction at Gasgroup . Installing at Cryolab at Cryolab.

CTHX transportation from Gasgroup workshop to Cryolab

Insulating with the first layer.

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CTHX insulation.

Insulating with the second thick layer.Drilling holes, fixing supports and placing the CTHX.

During the insulation procedure.

Awaiting for the glue to dry out.

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Collier support Armafix ø 42/45 Kavec collier support.

Wall mounting brackets x 3, holding the CTHX on the horizontal path.

CTHX connection to four loops mockup.

CTHX connection cooling plant.

PTT_01CTHX installation.

PTT_02

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Horizontal path view.

CTHX installation.

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CTHX installation.

CTXH to cooling box connection. Still needs to be insulated..

Cooling plant to CTXH connection. Still needs to be insulated.

CTHX view

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Future tasks.

A. Insulate the CTHX assembly connections (cooling plant, box).

B. Fix the PTT_02.

C. All the connections should be well done tightened.

D. A possible pressure test.

E. Calculations about the CTHX performance.

F. Comparison to future measurements.

Many thanks to Joao and Abdel.

Acknowledgements

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Documents

C ONCENTRIC TUBE H EAT EXCHANGER TEST SETUP AT C RYOLAB CO2 FOR CMS T RACKER WEEK MEETING. Theodoros Katopodis PH-CMX