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If the chillers have different flow requirements (meaning they are different sizes) then intermixing pumps becomes even more complicated. It can be done using VFDs on the pumps. The BAS can be preprogrammed with the appropriate pump speed required to deliver the correct flow to each chiller. This allows each chiller to receive its correct flow rate. Figure 44 - Alternative Primary Pump Arrangement Spare Pump Common Header Allows Any Pump to Operate with Any Chiller Chiller Isolation Valves The flow for each chiller is based on the design flow required by the chiller.

Other buildings such as hospitals or office buildings with computer, telecommunications or other winter chilled water loads can also take 32 Application Guide AG 31-003-1 advantage of a dual or VFD chiller. In many cases, these winter loads are relatively small. Conventional thinking would require a smaller chiller sized specifically for the load. With a dual or VFD chiller, there may not be a performance penalty to use a larger chiller sized for summer loads to handle the small winter load. The peripheral loads such as pumps should be checked when evaluating performance.

The reduced lift for the lag chiller allows it to provide more cooling capacity. Figure 39 – Basic Series Chiller System Operation For constant flow systems, the chilled water temperature range varies directly with the load. Depending on the load diversity, the chiller design temperature range will be less than the range seen at each load. In this case, the chiller range is 8°F while the cooling coil range is 10°F (Refer to Piping Diversity, page 24). The overall result is an increased chilled water pump and pipe capital cost plus higher annual pumping cost.

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Application Guide. AG 31-003-1. Chiller Plant Design

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