Laserfiche WebLink
D. APPROACH TO SAVINGS ESTIMATE <br />Kokosing's approach to Conservation Measures looks at each type independently for savings <br />opportunities. The sections below are base areas that we will want to quantify. Additional areas of <br />savings will be identified as we more fully understand the impacts the new CSO and clarifier equipment <br />will have on the WWTP, Operators, and power draw. <br />Capital Cost Avoidance. The GSC Code allows us to take a savings credit for the value of the project. <br />Kokosing's preference is to use a project value that was developed by the City independent of the <br />construction project. For other GSCs, the project value has come from sources such as: Capital <br />Improvement Plans, Facility Plans, Advanced Facility Plans, and Preliminary Engineering Estimates. <br />Capital Cost Avoidance is that independent number plus or minus scope items that were not included <br />/ removed from the project. Older estimates have been used and adjusted to current day dollars. <br />Energy Savings. Energy Savings for the new influent pumps will be calculated in two ways. First: <br />motor efficiency savings is calculated based on the change in the power draw from the existing <br />pumps and the new pumps. The energy draw is calculated based on presumed typical operations and <br />converted to dollars using the rate South Bend pays. The following calculation was performed as part <br />of the Plymouth WWTP GSC for changing blowers. <br />Assumed Required Air: 5000 scfin <br />Centrifiigal Blowers <br />1 blower (d,, 1750 scfin — 115 Hp <br />3 blowers @ 1750 scfin = 5.250 scfm <br />=3 x 115 Hp=345 Hp <br />345 Hp * 0.75 = 258.75 kW = 259 kW <br />Prorate to 5000 scfin — (5000/5250) * 259 kW-247 kW <br />Turbo Blowers <br />1 blower = 150 Hp (f3000 scfin) = 123 kW per Supplier Data Sheet <br />1 blower = 100 Hp (f2000 scfin) = 69 kW per Supplier Data Sheet <br />Total for 5000 scfin = 192 kW <br />Centrifii al <br />Turbo <br />Power usage u 5,000 scfin <br />247 kW <br />192kW <br />Annual operation (hotus) <br />8,760 hr <br />8,760 hr <br />Annual Power uses e kW*h <br />2,163,720 <br />1,681,920 <br />Annual power usage @ <br />$0.06/kWh <br />$129,823 <br />$100..915 <br />Annual Savings <br />- <br />$28,908 <br />The second energy savings calculation is based the change in power draw from constant speed <br />pumps to VFDs. Even if not truly considered during design, constant speed pumps would be the <br />"standard practice". The following calculation was performed as part of the East Chicago SD GSC for <br />pump replacement. <br />SOUTH BEND, INDIANA GSC 52 <br />