Variable Frequency Drives. Variable frequency drives were installed on hot water pumps at Xxxxxxxx Regional Middle School, Xxxxxxx X. Xxxxxx, and Pittston Consolidated School. Energy savings are achieved by reducing the speed of the motor to match the buildings heating load using pressure sensors 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 VFDs equaled $1,981 in realized savings, which is $2,825 short of the guaranteed savings of $2,825 (Table 67). Table 67 – Summary of Variable Frequency Drive Energy and Cost Savings Facility Improvement Measure Electric Energy Savings (kWh/ yr) Realized Cost Savings ($) Guaranteed Cost Savings ($) Excess/ Shortfall in Savings ($) Building Automation Variable Frequency Drives 16,008 $1,981 $2,825 ($844) Xxxxxxxx Regional Middle School 2,632 $326 $1,341 ($1,015) Xxxxxxx X. Xxxxxx 8,048 $996 $894 $102 Pittston Consolidated School 5,328 $659 $591 $69 Xxxxxxxx Regional Middle School: VFDs were installed on two 7.5 HP hot water pumps (HWP-3 and HWP-4) in at the Xxxxxxxx Regional Middle School boiler room. Savings were verified by trending electric consumption of both pumps continuously throughout this annual period. Since trending was not available for the entire Annual Period the electricity consumed during the missing months was calculated using the following method.
Variable Frequency Drives. 1. Should there be a requirement of MV VFDs, the Contractor shall ensure MV VFDs are procured in accordance with 240-50237146 requirements. Technical Schedules A and B (New MV VFD Technical Schedule AB Template 240-132875114) shall be provided to Employer for design acceptance.
