Cooling Tower Variable Frequency Drives Sample Clauses

Cooling Tower Variable Frequency Drives. Siemens installed variable frequency drives on the cooling tower fans at Xxxxxxxx Area High School and Xxxxx Xxxxxxxx. Energy savings are achieved by reducing the speed of the motor to match the cooling tower’s load instead of running at full speed all of the time. The following section details the VFD operation at each building. Due to server issues trending was unavailable from July 1, 2017 through October 6, 2017. Total savings for the cooling tower VFDs equaled $1,583 in realized savings, which is $1,346 short of the guaranteed savings of $2,929 (Table 77). Table 77– Summary of Cooling Tower VFD Energy and Cost Savings Facility Improvement Measure Electric Energy Savings (kWh/ yr) Realized Cost Savings ($) Guaranteed Cost Savings ($) Excess/ Shortfall in Savings ($) Building Automation Cooling Tower Variable Frequency Drives 12,792 $1,583 $2,929 ($1,346) Xxxxxxxx Area High School 12,792 $1,583 $1,425 $158 Xxxxx Xxxxxxxx 0 $0 $1,504 ($1,504) Xxxxxxxx Area High School: A VFD were installed on one 20 HP cooling tower fan (FC-1). Savings were verified by trending the outdoor air temperature and frequency of the cooling tower fan continuously throughout this annual period. The speed of the fan at each outdoor air temperature bin was determined and entered into the energy savings calculation. Table 78 summarized the trend data compared to the expected time at flow rates. Table 78 – Summary of Trend Data of VFD Average Speeds at each Outdoor Air Temperature Bin Outdoor Air Temp (°F) Expected FC-1 74.30 100% 23.0% 74.10 100% 35.5% 72.10 100% 42.2% 69.90 84% 28.0% 68.10 73% 22.9% 67.40 62% 18.8% 66.20 54% 20.0% 65.90 48% 19.6% 65.10 44% 16.7% 64.20 39% 16.5% 63.30 36% 13.2% 62.30 33% 14.1% 60.10 30% 6.6% 58.90 28% 5.4% 56.90 25% 3.7% 54.90 23% 1.4% 53.00 21% 1.4% 50.90 18% 0.5% 49.00 17% 0.0% 47.10 15% 0.0% 45.90 13% 0.0% 44.10 0% 0.0% 42.00 0% 0.0% 39.90 0% 0.0% This measurement and verification plan is different from what was outlined in Exhibit C of the Performance Contract due to an unforeseen issue with the trend point for electric consumption (kWh). The data trended for electric consumption did not seem accurate and therefore it was not used to calculate savings for this Annual Period. Siemens is working on a solution to correct this issue and use those trend points in future. Overall, the speed of the fan was much lower than expected, yielding an increase in energy savings. Total savings for the cooling VFDs at Xxxxxxxx Area High School equaled $1,583 in...
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