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<br />Facility Audit Report 12 <br />San Leandro WWTF <br /> <br />Figure 3.2.1.1.3 – Energy Saving Performance of High Efficiency Blower Retrofits <br /> <br /> <br />The single Neuros option was sized to handle the flows where the existing Lamsons are least <br />energy efficient, up to 2600 SCFM. The two dual blower options could operate to 4000 SCFM, <br />covering almost all the 2010 baseline airflow demand. All three retrofits offer similar power <br />reductions of up to 2600 SCFM, as shown by their proximity in the figure. The dual blower <br />options continue to perform nominally better than baseline up to 4000 SCFM. At the airflows <br />above 4000 SCFM, the existing Lamson blowers perform adequately. This only represented <br />1.2% of the airflow demand in 2010; as a result, there is little energy saving incentive to improve <br />efficiency in this high airflow range. <br />Table 3.2.1.1.1 below shows the annual savings for all three process air retrofit options are <br />close. The turbo blowers (ABS and Neuros) are nominally more energy efficient, and two turbo <br />blowers are better than one. However, the incremental energy savings from the second turbo <br />blower does not justify the added capital cost. Likewise, the higher capital cost of the two <br />positive displacement blowers result in a less attractive payback than the single turbo blower. <br />The low pressure air supply system for the offline basin will require relatively little energy, due to <br />low airflow and pressure requirements. A constant 400 SCFM will be required at an estimated <br />maximum pressure of 2 psig. A 10 HP fixed speed Sutorbilt positive displacement (PD) blower <br />0% <br />25% <br />50% <br />75% <br />100% <br />125% <br />0 <br />50 <br />100 <br />150 <br />200 <br />250 <br />010002000300040005000600070008000 <br />F <br />l <br />o <br />w <br /> <br />F <br />r <br />e <br />q <br />u <br />e <br />n <br />c <br />y <br />, <br /> <br />% <br />Po <br />w <br />e <br />r <br />, <br /> <br />K <br />W <br />Process Airflow, SCFM <br />2010 Baseline KW <br />Single Neuros Turbo KW <br />Dual EE‐PAC PD KW <br />Dual ABS Turbo KW <br />2010 Process Airflow Frequency, %