Laserfiche WebLink
AMERESCO4 <br />Green . Clean . Sustainable <br />Update and Repair Air Handling Unit Variable Frequency Drives (VFD): <br />- 13 VFDs were replaced or added on AHUs 2, 3, 4, 5, 6, 8, 10, 11, and 12 <br />- The supporting return/exhaust fans F-19, 23, 27, and 34 were integrated. <br />Variable Frequency Drives (VFD) on Cooling and Heating Water Loop Pump and Valves: <br />- The existing chilled water pumps and hot water pumps were replaced with new Armstrong <br />pumps and integrated VFDs. <br />- The existing 3-way chilled water valves and hot water valves were replaced with new 2-way <br />electronic valves on AHU 1, 3, 4, 5, and 6. <br />Chiller and Cooling Tower Repair and Rework: <br />- The three existing isolation valves on the cooling tower cells were repaired or replaced, <br />allowing the tower to be staged on and off. <br />- Isolation valves were provided for the chilled water system to segment chillers and flow. <br />Add Humidification, Control, and Monitoring System to Museum: <br />- Humidity sensors and a steam humidifier were added to the existing unit serving the museum <br />to provide humidification control. <br />Kitchen Unit Rework: <br />- A new kitchen air handling unit was added to maintain and control the kitchen environment <br />separately from the rest of the facility. <br />How Savings Were Determined — The savings for this ECM were determined by calculating how much <br />electricity the air handling unit fan and hydronic pump motors used at full speed operation, the expected <br />electricity consumption of the motors with VFD operation, and the difference in the resulting values. <br />Measurement and Verification — The M&V approach for the HVAC System Upgrades ECM is based on <br />IPMVP Option A. This includes visual inspection of the VFDs to verify that the drives are capable of <br />reducing the motor speeds and analysis of BAS trend data to verify the reduction in speed. <br />Trend data was recorded throughout the reporting period by the BAS. A sample of the VFD speed data <br />from the year eight period is included on the following pages. The data shows that VFDs are remaining <br />below full speed most of the time. <br />October 15th, 2024 <br />Page 14 <br />