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Extra resources for Application Guide. AG 31-003-1. Chiller Plant Design
The condenser loop operates whenever the chillers operate. If both chillers are the same and the condensers are piped in parallel, the lead chiller will accomplish about 45% of the system load and the lag chiller will accomplish about 55% of the system load. This occurs because the lead (downstream) chiller is supplying chiller water at the system set point (typically 44°F). 5°F to the lead chiller. 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.
The dual or VFD chillers partly loaded should be more efficient than one conventional chiller fully loaded. The chiller savings can be used to offset the additional pumping cost from operating peripheral pumps. Moreover, this arrangement will provide the necessary chilled water flow on the primary side to offset the low delta T problem. Total System Analysis When estimating the savings, consider both the type of chillers used and the available lift reduction (condenser relief) and peripheral equipment that must be operated.
The high flow rate can result in high water pressure drops. Since the chillers are in series, the pressure drops of the chillers must be added. If the typical 10°F system temperature difference is maintained, then single pass evaporators should be considered. This will lower the pressure drop to an acceptable level. Basic Components Chillers Chillers selected for series applications require special consideration. Special care should be taken when using smaller chillers with limited shell arrangements such as small air or water-cooled chillers.