Presentation from Joel and Franck

status:

• system underperforming: 2 degrees variation during a day
• lack of monitoring: only the temperature is available
  • difficult to know what the system is doing
  • no monitoring of the fan status, pressure/flow, setting of the valve opening
• poor remote cotrollability: only set temperature and door opening limits
• lack of insulation for the doors
• poor/degraded air tightness 

proposed improvements:

• better insulation:
  • doors'insulation
  • air thightening foam replacement
• adding extra monitoring:
  • better temperature probes
  • valve setting
  • input and output flow
  • fan rotation speed
• adding extra controls:
  • fan switch
  • PID remote retraining
  • remote valve control
  • status dashboard

proposed plan of action:

• cleaning of the heat exchanger in one point this YETS
• cleaning of all heat exchangers in LS3
  • replacement in one point of the heat exchangers with a spare set
  • cleaning of the removed exchangers to become the new spares
  • repeat from start in another point
• installation of a prototype system in this YETS
  • system to be place in parallel at first and 'passive'
  • the test system will be overequipped (superset of the monitoring)
  • switch to the new system after validation of the integration
  • definition of which sensors are relevant after few months of experience
• installation of the new systems in LS3

Presentation from Enrique

• ICS offers a full service for systems using PLC:
  • development
  • support for the system definition
  • maintenance and piquet
• the proposed solution is fully integrated in the control system
• for our systems they suggest a PLC per point
  • cost per point including all the sensor interfaces: 2kCHF
  • the sensors wiring is up to BI
  • the sensors are to be provided by BI
• the development of the control SW is a 1 tantum of 62k including the suppoort and maintenance after

Discussion and actions:

• the intervention is estimated to 4 hours per rack but with large uncertainties (better estimate after YETS)
  • replacement and cleaning of the exchanger
  • cabling of sensors
  • insulation
• the cost per rack for sensors and insulation is estimated at less than 1k per rack
  • flowmeter and valves to be rediscussed with EN/CV <= action on Franck and Joel
• the total cost per BA is estimated to ~8k: total material cost 64k
• with the development cost, originally assumed on BI, we arrive to 130k