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Cooling and Ventilation issues

1

FUTURE EXPLOITATION OF THE EAST AREA

EN-CV Michel OBRECHT

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Cooling and Ventilation issues

Objectives

Ventilation

Cooling

Conclusion

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Objectives

Ventilation :

Upgrade of the existing HVAC system for the next 25 years

Installation of air conditioning system for the primary zones

Cooling :

Separation of the cooling water circuit for the primary zones

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Ventilation : Upgrade of the existing HVAC system for the next 25 years

HVAC existing system :Main Building :

heating system connected to the overheated water network Distribution network 8 Air Handling Units : 560 kW 80.000 m3/h Radiant panels : 625 kW

Ratio : 0,39 W/m3*K(SIA 380 standard : Ratio : 0,07 W/m3*K, 18% of existing)

Barracks and Offices :9 split system : 45 kW

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Ventilation : Upgrade of the existing HVAC system for the next 25 years

HVAC existing system :

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Ventilation : Upgrade of the existing HVAC system for the next 25 years

HVAC existing system :

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As build Existing Target SIA

Maximum Heat losses [kW] 800 1200 490 216

Energy consumption [gWh/y] 2000 3000 1200 540

Energy cost [kCHF/y] 200000 300000 120000 54000

Cost saving [kCHF/y] 100000 0 180000 246000

Ventilation : Upgrade of the existing HVAC system for the next 25 years

Heat deperditions : improvements are needed for air tightness and insulation

In order to avoid waste of energy and to improve ambient conditions,the insulation and the air tightness of the building has to be improved.

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Ventilation : Upgrade of the existing HVAC system for the next 25 years

Proposed solution :keep the existing configurationimprove the thermal performance of the building to as build

situation replace :

the 8 AHU the overheated distribution network the electrical installation the instrumentation and PLC the barracks HVAC system

Cost estimation : 985 kCHF

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Ventilation : Installation of air conditioning system for the primary zones

No existing system

Proposed solution : similar to nTOF target zone

Primary zone in underpressure <50 PaHVAC system including HEPA filtration on air extraction

Cost estimation : 260 kCHF

Without proper air tightness, the underpressure and the static confinment shall not be achieved nor guaranteed

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Cooling : Separation of the cooling water circuit for the primary zones

RP requirement : avoid contamination of external demineralised water networkUser requirement : maintain the existing inlet temperature (25°C in summer) head loads : 700 kW

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Cooling : Separation of the cooling water circuit for the primary zones

Proposed solution :

Installation of a seperate water circuit for primary beamsIncluding a new cooling station separated from the existing one

Cost estimation : 1.200 kCHF

Study to estimate water activation to be performed by RPTo be validated :• Operating modes (drains, access, maintenance, ...)• Location of new cooling towers, heat exchangers, pumps, ...

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Cooling and Ventilation issuesConclusion

Cost estimation :Upgrade of the existing HVAC system 985 kCHFInstallation of air conditioning system for the primary zones 260 kCHFDedicated cooling circuit for the primary zones 1.200 kCHF

Manpower : 1,25 FTE over 12 months

Taking into account the CV workload until the end of LS1 and priorities defined for that period, the project cannot start in the coming months

Related points :Building infrastructure improvementBarracks refurbishment

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Cooling and Ventilation issues

Thank you for your attention