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Opening of Proposals - WWTP Solar Guaranteed Energy Savings Contract Proj. No. 124-015 - Ameresco
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Opening of Proposals - WWTP Solar Guaranteed Energy Savings Contract Proj. No. 124-015 - Ameresco
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5/28/2024 3:13:43 PM
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Board of Public Works
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5/28/2024
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<br /> <br /> <br />“Page content is subject to Confidentiality Restrictions” <br /> <br />City of Arvada, Colorado | Project #37213 | M&V Report – Year 2 | Page 17 <br /> <br /> <br />City of Arvada, Colorado <br />Installation of the boilers, pumps, piping, and auxiliary plant equipment was inspected and found to be acceptable by <br />Ameresco. <br /> <br />Correct phase rotation of the system pumps was verified, and the hot water piping was pressure tested by the electrical <br />contractor. Point-to-point checks were performed on the new temperature sensors. Integration of the BACnet enabled <br />boiler and VFD to the BAS and their sequences of operations was verified. Boiler startup was performed by the factory <br />representative. <br /> <br />Measurement & Verification <br />The M&V Plan for this ECM was based on IPMVP Option A – Retrofit Isolation Using a Key-Parameter Measurement. <br /> <br />The key parameter that was measured for this ECM was boiler efficiency. The post installation boiler efficiency was <br />measured and inserted into the savings calculation to determine the Verified Savings. The boiler combustion tests are <br />shown in Appendix D. <br /> <br />Multiple readings were taken across the firing range of the boilers, and the average measured efficiency was 90.2%. <br />The measurements were compared to the manufacturer’s 100% firing rate efficiency curve for the new boilers, which is <br />based on a 20°F rise. Two of the measurements were taken at a 100% firing rate, with one of the measurements <br />occurring when the boiler was achieving a 10°F rise and the other occurring when the boiler was achieving a 24°F rise. <br />The measured efficiency at a 10°F rise was 88.6%, and the measured efficiency at a 24°F was 88.8%. Since the <br />manufacturer’s efficiency curve is based on a 20°F rise, the 88.8% efficiency from the measurement taken at a 24°F <br />rise was inserted into the original savings calculation in the bin that the hot water supply temperature of the <br />measurement falls in. This recalculated the efficiency curve, based on the actual measurement, to determine the <br />Verified Savings. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />
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