TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV1 Design, construction and installation of a double loop fluorocarbon 150 kW cooling plant for the CMS Tracker and Preshower detectors M. Battistin, M. Bosteels, M. Pimenta, P. Tropea IT3230/ST/CMS

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV2 CMS Tracker and Preshower cooling plant General scheme USC55 UXC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV3 Primary cooling plant functional scheme Cooling system Cooling system: evaporative Fluid Fluid: R410A Power Power: 150 kW Installation Installation: USC55, zone CV Chilled water R410A to/from UXC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV4 Primary cooling plant: USC55 zone CV CompressorsCompressors: 2 or 3, oil free, two stages, piston, regulation system 0÷100% CondenserCondenser: running chilled water and R410A, T_cond= 30°C Storage tankweight transmitter heaterStorage tank: equipped with a weight transmitter and a heater Regulation valve p transmitterRegulation valve: for chilled water flow rate regulation with respect to the pressure, measured by the p transmitter on the tank Filter,Filter, mechanical Buffer tankBuffer tank HYDRAULIC EQUIPMENTS

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV5 Primary cooling plant: USC55 zone CV Compressed air Electrical power distribution Chilled water circuit REQUIRED SERVICES ELECTRICAL & CONTROL EQUIPMENTS Electric power distribution rack for compressors Electric power distribution rack for detector cooling units (cabling to the UXC55) Control racks with electronics (PLC) Control racks for electric/pneumatic signal conversion

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV6 USC55 zone CV

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV7 USC55 zone CV

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV8 Electrical and control rack installation Control rack: 470 valves for electrical/pneumatic signal conversion Electrical power distribution rack & electrical part of the control racks 3 & 4 m 0.9 m 2.5 m 0.9 m

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV9 USC55 UXC55 Total pipe length up to first floor balconies, at the service tunnel: 90m “near side” – 120 m “far side” Piping between USC55 and UXC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV10 Fluid: liquid C 6 F 14, cooled by R410A arriving from USC55 7 Cooling Units: 2 x Silicon Strip 1 x Pixel 2 x Thermal Screen 2 x Preshower Secondary cooling plants: detector units PERFORMANCES DEMANDED

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV11 Detector unit layout example: Pixel unit COLD BOX CONTROL RACK for INSTRUMENTATION R410A from/to UXC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV12 Detector units in the UXC55 Tank: vacuum pumpTank: low pressure reservoir, depression created by means of a vacuum pump PumpPump: magnetic coupling Alumina filtersAlumina filters: for eventual acids formation Evaporator:Evaporator: R410A evaporates at -45°C, C 6 F 14 is cooled to the required service temperature (-30°C ÷ -10°C) Expansion valve temperatureExpansion valve: regulates the flow rate of R410A arriving to the evaporator, with respect to the temperature measured at the distribution Heat exchangerHeat exchanger: to sub-cool the liquid R410A Back pressure regulatorBack pressure regulator: to maintain the distribution pressure constant HYDRAULIC EQUIPMENTS

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV13 Thermal Screen and Preshower units: EPS Emergency fridge unit (EPS) Electrical heater for T regulation

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV14 Detector unit distribution circuits

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV15 Detector units in the UXC55 Shut-off valve:Shut-off valve: pneumatic, normally closed shut-off valve, with additional metering screw Primary element (calibrate orifice)Primary element (calibrate orifice): used to measure the flow rate by means of a pressure transducer (shall induce a pressure loss at nominal flow rate of less than 100 mbar) Small piping for instrumentation (before and after the orifice), equipped with Schrader valves on the control rack Shut-off valveShut-off valve: pneumatic, normally open Non-return valveNon-return valve: by-pass for the shut off valve in case of overpressure on the detector circuit DISTRIBUTION LINES HYDRAULIC EQUIPMENTS

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV16 REQUIRED SERVICES INSTRUMENTATION on the RACKS Differential pressure transmitter (piezoelectric):Differential pressure transmitter (piezoelectric): to be connected to the Schrader valves for flow rate measurements ManometerManometer Scale transducerScale transducer Compressed air (valve power) Electrical power Waste water recuperation network Detector units in the UXC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV17 Detector units overall dimensions Silicon Strip cooling unit Resume for all cooling units

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV18 Detector units on UXC55 first floor balconies R410A from/to USC55

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV19 CMS Tracker and Preshower cooling plant PLANNING IT-3230-TS-CMS out6 January 04 Bidder’s conference23 January 04 Tender answers15 March 04 Finance committeeJune 04 Contract signatureJuly 04 Design meetingSeptember 04 Complete installation at contractor’s premisesFebruary 05 Performance test at contractor’s premisesMay 05 Cavern installationJune 05 CommissioningDecember 05

TS-CV-Detector Cooling 22-Jan-04P. Tropea - JCOV20 CMS Tracker and Preshower cooling plant CONTROL SYSTEM Demanded precision on the set temperature +/- 1 K Demanded maximum overshoot for a step perturbation +/- 3 k ADVANCED CONTROL SYSTEM demanded as an option for each detector cooling unit