cooling loads. critical system p&id critical system main issues oversized chillers issues with...

1.1.1 Design Cooling Load

Room Name Room Cooling Load

[kW]

Installed (Duty) Cooling Capacity

[kW]

Remarks

Current Future Current Future

Rack Room – Low Density 65 67 105 105 No change. Rack Room – High Density – Air-cooling

87 107 100 80 New AHU-2

Rack Room – High Density – Water-cooling

- 80 New EWF-0001/2

Telecom Room 10 15 46 18.5 New AHU-5A, AHU-5B

Total – Critical 194 224 251 284 New 358kW CH-2/CH-3

Control Room 100 100 100 100 AHU-1 Glass Box - Meeting Room 37 37 37 37 FC-2 Lunch Room 5 5 5 5 FC-1 Meeting Room 5 5 5 5 AHU-4

Total – Non-Critical 147 147 147 147 Existing 275kW CH-1

Table 1 – Design Cooling Loads

Cooling Loads

Critical System P&ID

Critical system Main issues

• Oversized chillers• Issues with switch over• By-pass valve

AHU5A/B?

Looking at the T and Flow values:Primary: 112 kWSecondary 83kW

FSL position

Min Tank volume 5.7 m3(3 starts/hour)

On/Off valve.Needs to be a regulating valve

• Oversized chillers• Issues with switch over• By-pass valve

débit HAC2TA réglée à 7,6

débit HAC3TA réglée à 8,0

HAC2 en fonctionnement 57,7 m3/h 0 m3/h

HAC3 en fonctionnement 0 m3/h 58,2 m3/h

HAC2 et 3 en fonctionnement 50,5 m3/h 49,8 m3/h

High chilled water return T

No reheating after dehum.Air T too cold

Critical system Main issues

High Return T

Critical system Main issues

On/Off valve.Needs to be a regulating valve

Critical system Main issues

Critical System Controls status

Non Critical Main Issues• No Supervision.• On BA3 Chilled water system.• Chiller needs to be integrated in new controls.• Replacement of AHU4 cupboard• Not sure what kind of commissioning has been done.

• Critical System• Redo piping chillers for flow switches, if nothing else can be done.• Change by pass valves with regulating valves.• Heating element AHU2.• Probably a general recommissioning and circuit balancing is needed.• CI snag list to be completed: OS in preparation.

• Non critical system• Supervision.• Finish electrical works on non critical. • Integrate non critical chiller in controls.

• Electrical schematics to be updated.• Labels.

Summary