Laserfiche WebLink
<br />Facility Audit Report 8 <br />San Leandro WWTF <br />7. The low pressure blower supplying the offline basin will require no more than 2 psig <br />discharge pressure, including line losses. <br />8. The maximum process air demand post retrofit will be 400 SCFM less than baseline, as <br />a result of the low pressure blower supplying air to the offline basin. The peak power <br />demand of the post-retrofit process air blower system will be reduced in proportion to the <br />slope of baseline airflow vs. power, in the 4000-7000 SCFM airflow range. <br />9. The average billing period maximum power demand from the blowers during the <br />baseline year is taken as the average of the peak power readings in each of the twelve <br />calendar months of hourly SCADA samples. The peak period maximum demand is <br />assumed the same as the overall maximum demand. <br /> <br /> <br />3. RECOMMENDED ENERGY EFFICIENCY MEASURES <br />3.1 Summary of Identified Energy Efficiency Measures <br />Table 3.1.1 provides a energy and economic performance of the identified blower replacement <br />EEM. <br /> Table 3.1.1 – Performance Summary of the Blower Replacement EEM <br /> <br /> <br />3.2 Energy Efficiency Measure Description <br />3.2.1 Aeration Blower Retrofit <br />The fixed speed Lamson multistage blowers each have a design capacity of 3400 SCFM, where <br />they are reasonably energy efficient for the supply of process air. However, they do not turn <br />down efficiently, and most process airflow demands are well below one blower’s design point. <br />The blowers do have suction throttling, the most energy efficient way to reduce the output of <br />multistage blowers. Suction throttling is often limited by blower surge; the point where the <br />blower encounters a compression ratio greater than it was designed for. In the range of 1000- <br />3000 SCFM, a new high efficiency blower with better turndown will reduce energy consumption. <br />The new blower would replace one of the existing Lamsons. It would have almost the same <br />capacity, so there would be minimal loss of spare capacity. <br />Energy <br />Efficiency <br />Measure <br />(EEM)Description <br />Demand <br />Savings <br />(KW) <br />Energy <br />Savings <br />(Annual <br />KWh) <br />Electrical <br />Cost <br />Savings <br />($/Yr) <br />EEM <br />Capital <br />Cost ($) <br />Simple <br />Payback <br />Period <br />(Years) <br />Incentive <br />Rebate <br />($) <br />Adjusted <br />Payback <br />Period <br />(Years) <br />Aeration <br />Blowers <br />Turbo, PD <br />Blower <br />Retrofit10276,000$29,600 $195,000 6.6$25,800 5.7