Consider switching from one large chiller (1,000 ton) to four chillers (each rated at 250 ton). Using the normalized savings shown in Figure 8.10, estimate the annual energy savings for using a multi chiller system in a building located in Chicago, Illinois, if the large chiller is operated 5,000 equivalent full-load hours per year and has a rated COP of 4.0.

Figure 8.10

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Energy Saving (%) 15.0 12.5 10.0 7.5 5.0 2.5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 # of Chillers Phoenix Chicago Denver - - Atlanta