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CONFIDENTIAL <br /> <br /> July 16, 2002 <br /> <br />To: Cheri Carroll <br /> <br />From: Lance Chontos <br /> <br />Re: City of Santa Ana/chiller/variable speed drive <br /> <br />The City of Santa Aha has a Police detention/administration complex that is cooled by <br />three chillers. One is a 200 ton rotary chiller, and the other 2 are each 400 ton centrifi~gal <br />chillers. The chillers run 24/7, and city personnel feel that approximately 350 tons of <br />cooling are required on a hot day. <br /> <br />The city is considering installing a variable spee.d drive (VSD) on one of the centrifugal <br />chillers, and asked for an estimate of the savings that would result. <br /> <br />Field Engineering estimated eight scenarios as follows: <br /> <br />a) One centrifugal chiller running 24/7. <br />b) One centrifugal chiller with a VSD running 24/7 <br />c) One rotary chiller running 24/7, with the centrifugal chiller with VSD coming on as <br />needed. <br />d) One rotary chiller running 24/7, with the centrifugal chiller w/o VSD coming on as <br />needed. <br />e) One centrifugal chiller running M-F 7AM-6PM. <br />f) One centrifugal chiller with a VSD running M-F 7AM-6PM. <br />g) One rotary chiller running M-F 7AM-6PM, with the centrifugal chiller with the VSD <br />coming on as needed. <br />h) One rotary chiller running M-F 7AM-6PM, with the centrifugal chiller w/o the VSD <br />coming on as needed. <br /> <br /> <br />