Engineering Department EN Cooling and Ventilation issues 1 FUTURE EXPLOITATION OF THE EAST AREA EN-CV Michel OBRECHT

Engineering Department EN Cooling and Ventilation issues  Objectives  Ventilation  Cooling  Conclusion

Engineering Department EN 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 circuit for the primary zones

Engineering Department EN 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 m 3 /h  Radiant panels :625 kW Ratio : 0,39 W/m 3 *K (SIA 380 standard : Ratio : 0,06 W/m 3 *K) Barracks and Offices :  9 split system :45 kW

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

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

Engineering Department EN Ventilation : Upgrade of the existing HVAC system for the next 25 years Situation actuelle Augmentation Actuel/Origine Situation d'origine LocalTypeElément Déperd. [W] Déperd. [%] LocalTypeElément Déperd. [W] Déperd. [%] Hall %59% Hall % Transmission %42%61% Transmission % Mur en béton %0% Mur en béton % Vitrage simple fixe %0% Vitrage simple fixe % Durisol %0% Durisol % Durisol pignon %0% Durisol pignon % Eternit %10%347% Eternit % Toiture % 164% Toiture % Pont thermique9 2861%0% Pont thermique9 2861% Renouve llement d'air %17%55% Renouve llement d'air % Renouvellement %0% Renouvellement % Perméabilité %17%150% Perméabilité % Heat deperditions : calculation notes

Engineering Department EN Ventilation : Upgrade of the existing HVAC system for the next 25 years Proposed solution :  keep the existing configuration  replace :  the 8 AHU  the overheated distribution network  the electrical installation  the instrumentation and PLC  the barracks HVAC system  upgrade the inslulation and the tightness of the building (GS issues)

Engineering Department EN Ventilation : Upgrade of the existing HVAC system for the next 25 years Proposed solution, Cost estimation : Ventilation : Upgrade of the existing HVAC system Uni t Quantit y Unit Price Ratio/A HU Total Price [CHF] Contengencies 5% AIR HANDLING AIR HANDLING UNITS AHU Hallass AHU Barrackass AHU Officeass Extracteurass AIR DUCTS AHU Hallass AHU Barrackass ELECTRICITY AND REGULATION20% INSTRUMENTATION10% DESIGN DOCUMENTATION TEST OVERHEATED WATER NETWORK PIPING + ACCESSORIES + PUMPS SAFETY 3. RADIANT PANNEL ELECTRICITY AND REGULATION DEMINERALISED WATER NETWORK ACCESSORIES

Engineering Department EN Ventilation : Installation of air conditioning system for the primary zones No existing system Proposed solution : similar to nTOF target zone Primary zone in underpressure HVAC system including safety filtration on air ectraction Cost estimation :260 kCHF Key point : Air tightness of the primary zone (GS improvement)

Engineering Department EN Cooling : Separation of the cooling circuit for the primary zones RP requirement : avoid contamination of external demineralised water network User requirement : maintain the existing inlet temperature head loads : 700 kW

Engineering Department EN Cooling : Separation of the cooling circuit for the primary zones Proposed solution : Installation of a dedicated demineralised water cooling system for the primary zones including 2 cooling towers Cost estimation :1.300 kCHF including civil works

Engineering Department EN Cooling and Ventilation issues Conclusion Cost estimation : Upgrade of the existing HVAC system 985 kCHF Installation of air conditioning system for the primary zones 260 kCHF Separation of the cooling circuit for the primary zones1.300 kCHF Manpower :1,25 FTE over 12 months Related points : Building infrastructure improvement Barracks refurbishment

Engineering Department EN Cooling and Ventilation issues Thank you for your attention