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100% ---------------------------------------------------------------- <br />98% f--------------------------- - - - - -- ------ - - - - -- ------------------ - - - - -- <br />9696 I- - - - - -. -_-------- .---- -- ----- -- - - ------ - - - - - - -- ------------------- <br />f <br />i <br />949/7 ------------- --- ----------------- <br />6 <br />c92 % - - - - -- --------------------------------------------------------- <br />°i Noncondensing mode <br />d90% ------------------ - - -- - - -- -------------------------------------------- <br />Dew point <br />'a 889/7 ------------------- - - - - -- -- - -- ------------------------------------------ <br />M <br />86% -------------------------- - - - - -- - - -- - -- ------ - - - - -- <br />84% --------------------- - - - - -- ---------------------------------------------- <br />Condensing mode <br />8296 7 - - -- -- --- ----- - - - - -- -- ---------------------------------------------- <br />80% <br />80 90 100 110 120 130 140 150 160 170 180 190 200 210 <br />Inlet water temperature, degrees F <br />Figure 1. This graph shows the effect of inlet water temperature on boiler efficiency. <br />Outcomes— energy saved, operations improved. The savings since the new boiler <br />installations in fall 2010 are shown in the B3 Benchmarking database. The chart below <br />(figure 2) shows a savings of $10,000 in 2012 compared to the base year of 2010. The 83 <br />Benchmarking ratio for the Government Center was 203 percent in 2010, meaning it used <br />more than twice the energy than if it were a new building built to current energy codes. The <br />B3 Benchmarking ratio today improved to 160 percent, indicating there still may be <br />opportunities for energy conservation actions. <br />Sherburne County annual natural gas consumption <br />2010 365 159,167 174,078 <br />2011 365 159,167 16 7, 612 <br />2012 366 159,167 146,413 <br />174,078 0 <br />176,700 -91088 <br />166,466 - 20,053 <br />0% $111,014.55 $0.64 <br />-5w,j SLM760.56 $0.60 <br />-12% $72,191.31 $0.49 <br />Figure 2. This Minnesota X33 Benchmarking chart shows a 12 percent natural gas savings for <br />the Sherburne County Government Center since 2010. <br />28 <br />