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Show TABLE 1 Comparison of water use by Air Conditioning Type Type Unit Flow rate( a) Annual Use( b) ( gpm) ( MC/ vr) Once Through 300 77.8 Recycling 8.4 2.2 Evaporative 26 6.7 ( a) Based on 500 tons capacity, 250 tons cooling, once through AT of 20 ° F, cooling tower evaporation rate of 2.4 gpm/ 100 tons, and 3.5 ratio of concentration. ( b) Assumes 180 days of operation per year. TABLE 2 Annualized Cost Comparison Estimated cost items Once Through Recycling capital Cost( a) 500- ton complete cooling system, $ 130,000 $ 150,000 including equipment and installation operation and Maintenance water sewer Electrical Chemical Annualized Cost ($/ YR) $ 195,000 $ 84,000 50,000 1,500 83,000 1,000 50,000 66,000 - 0- 1,000 ( a) Based on 15- year average life, 5 percent annual interest rate. ordinances may speed the conversion from flow- acceptance and desired results. In accordance through systems. A number of regulatory options with Subsection 207( f)( 2)( H) of the CUPCA, may be considered depending on public these provisions should only apply to new 76 |