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Environmental Conditions in the LHC Experimental Caverns

Environmental Conditions in the LHC Experimental Caverns. JCOV Thursday 18 th March. ATLAS. UX15 Cavern conditions specified in Technical Specification IT-2659/ST/LHC (summary in Engineering Specification LHC-UA15-ES-001, EDMS No. 313039) Heat Load = 180 kW Air flow rate = 60,000 m 3 /h

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Environmental Conditions in the LHC Experimental Caverns

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  1. Environmental Conditions in the LHC Experimental Caverns JCOV Thursday 18th March

  2. ATLAS • UX15 Cavern conditions specified in Technical Specification IT-2659/ST/LHC (summary in Engineering Specification LHC-UA15-ES-001, EDMS No. 313039) Heat Load = 180 kW Air flow rate = 60,000 m3/h Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature Temp. range in cavern = 18 °C (floor) – 28 °C (vault) Air displacement principle: • cool air supplied at the bottom of the cavern (highest relative humidity) • warm air at the extraction point at the vault

  3. ATLAS • Detailed simulations performed to study overall temperature gradients and local hot spots (“Thermal analysis of the airflow around the ATLAS muon barrel”). No simulation available for humidity distribution. • Simulation made by ILK (on basis of 100 kW heat load) useful to illustrate humidity stratification. • Requirement on relative humidity (< 70 %) respected.

  4. CMS • UXC55 Cavern conditions in same Technical Specification, IT-2659/ST/LHC. Heat Load = 100 kW Air flow rate = 45,000 m3/h Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature Temp. range in cavern = 18 °C (floor) – 26 °C (vault) Air displacement principle: • cool air supplied at the bottom of the cavern (highest relative humidity) • warm air at the extraction point at the vault

  5. ALICE • UX25 Cavern conditions in Engineering Specification LHC-UA-ES-0004 (EDMS No. 386351). Heat Load = 100 kW Air flow rate = 45,000 m3/h Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature Temp. range in cavern = 17 °C (floor) – 24 °C (vault) Air displacement principle: • cool air supplied at the bottom of the cavern (highest relative humidity) • warm air at the extraction point at the vault

  6. ALICE • UX25 Detector conditions in Engineering Specification LHC-UA-ES-0004 (EDMS No. 386351). Air flow rate = 6,000 m3/h Pressure head = 22,500 Pa Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature

  7. LHCb • UX85 Cavern conditions (UXD, detector area) in Engineering Specification, EDMS No. 351740 (not released). Heat Load = 50 kW Air flow rate = 22,500 m3/h Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature Temp. range in cavern = 17 °C (bottom) – 24 °C (vault) Air mixing principle: • cool air supplied via grilles at 2 m from the bottom of the cavern • warm air extracted via duct under cavern vault • lower stratification, much more entrained air and secondary flow pattern

  8. LHCb • UX85 Cavern conditions (UXC, protected area) in Engineering Specification, EDMS No. 351740 (not released). Heat Load = 50 kW Air flow rate = 22,500 m3/h Supply temperature = 17 °C Supply air humidity = 10 °C dew point temperature Temp. range in cavern = 17 °C (bottom) – 24 °C (vault) Air mixing principle: • cool air supplied via grilles at 2 m from the bottom of the cavern • warm air extracted via duct under cavern vault • lower stratification, much more entrained air and secondary flow pattern

  9. All Experimental Caverns • Supply air humidity: 10 °C dew point temperature • Maximum humidity (extraction): 12 °C dew point temperature (high humidity alarm) • No internal latent loads, humidity rise may come from water leaks or through-wall infiltrations, air infiltrations from annex spaces, etc. • Drying capacity (20,000 m3/h, between 10 & 12 °C dpt )max: 23 kg/h

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