SIEMENS BUILDING TECH 1 -2003 - Laserfiche WebLink

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CONFIDENTIAL Note that the first two columns in the above chart match building load vs bin temperature, but the first, third, fourth, and fifth columns match delivered cooling loads of the chillers vs kW/ton. Therefore, to find the energy required to deliver 300 tons of cooling using the rotary chiller as the prime with the centrifugal w/o VSD as the secondary, the calculation would be: Hours/year in the 90F bin x kW/ton of rotary chiller at 200 tons x 200 tons + hours/year in the 90F bin x kW/ton of centrifugal chiller at 100 tons x 100 tons: 5 x .592 x 200 + 5 x .577 x 100 = 880 kWh/year The Building Load Line Curve (Building Load vs Temperature Bin) is derived from Yorkcalc. It assumes the maximum load (350 tons) occurs at Design Outside Temperature, and that the balance point (the point at which no heating or cooling is required) is 55F. The kW/ton column is supplied by the manufacturer as a chart of capacity (in tons) vs unit performance (in kW/ton). These numbers are derived assuming the water temperature entering the condenser is 80F at 100% machine load and decreases to 55F at 10% machine load. Appendix B Selected Hyperlinks 1) Incentive Programs State of Calif w~vw.scespc.com The above calculations are estimates only. Southern California Edison Company makes no warranty, express or implied, including but not limited to, any warranty of merchantibility or fitness for any particular use or application.