Trane TRG-TRC016-EN manual Contingency Planning, notes, Chiller-PlantControl, period four

period four

Chiller-Plant Control

notes

Contingency Planning

piping stubouts

electrical
connections	Figure 99

In addition to failure recovery, it is wise for the system design engineer to work with the building owner to develop a contingency plan for chilled water in the case of an emergency shutdown or an extended breakdown. Many organizations have contingency plans for critical areas of their business. Some deal with natural disasters and others with the loss of power in critical areas. However, few have taken the time to think about what a loss of cooling would mean to their facility. This is often especially critical for process-cooling applications.

Cooling contingency planning is intended to minimize the losses a facility may incur as a result of a total or partial loss of cooling capacity. It allows a building operator to act more quickly by having a plan in place and by proactively preparing the facility. Such a plan often includes working with suppliers to temporarily lease cooling equipment. During initial construction, it is easy and cost-effective to provide piping stubs, which are built into the chilled-water system for quick connection, and easily accessible electrical connections. When equipment leasing is combined with these simple additions to the system, a contingency plan can be put into action quickly and the system can produce chilled water again in a short period of time.

It is important to first identify the minimum, or critical, cooling capacity required. With multiple chillers in a facility, it may be acceptable to have less than full capacity in an emergency situation. For example, the chiller plant may consist of 1,800 tons [6,330 kW], but the minimum capacity required in an emergency situation may only be 1,200 tons [4,220 kW]. Therefore, it is also important to identify a contingency plan if Chiller 1 fails, if Chiller 2 fails, if Chillers 2 and 3 fail, and so on.

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