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                The Economics of Ozone 

                      (Direct Expenses)

 Cooling Plant Description:

Total Cooling Capacity                                  1,000 tons

Operating Hours/day                                          24

Makeup Water cost/1000 gals.                      $  2.50

Sewer Cost/1000 gals.                                  $  2.50   (likely to be much higher)

Electricity Cost / Kwh                                  $   .08

Load Factor Assumed                                      80%

 

Energy (Electric) Cost

                                                     Chemicals                      Ozone                                                                  

Ozone Generation / Year                            $     0.00                     $   10,372

Chiller operation                                        $ 448,512                     $ 403,661

Efficiency Improvement Factor Used                                                  10%  (Note 1)

Total Energy Costs:                                   $ 448,512                     $ 414,033

 

Water Costs (replacement and sewer)

Cycles of Concentration                                     3                                  6

Evaporation Rate, gals/day                            34,560                           34,560

Blow-down Rate, gals/day                             17,280                             6,912

Total Water Replacement  Gal/Year         18,921,600                    15,137,280

Water  Replacement Cost Per Year             $ 47,304                        $ 37,843

Sewer Costs                                              $ 15,768                           $ 0.00

Total Water Plus Sewer Costs Per Year    $   63,072                       $  37,843

 

Chemical costs

Treatment cost/yr (chemicals)                   $ 12,000                            $ 0.00

 

Total direct costs

Energy                                                 $  448,512                     $    414,033

Water                                                  $    47,304                     $      37,843

Sewer                                                  $    15,768                     $         0.00  (Note 2)

Chemicals                                            $    12,000                     $         0.00 

                                             Total      $  523,584                     $   451,876

 

Savings (direct costs) with Ozone:    $  71,708.00   (Note 3)

 

            Indirect expense (labor) will be less also, because of the perpetually

           clean condition of heat exchangers and reduced corrosion.  Value = $ ???

 

Note 1- Energy Efficiency Factor used in this example equals 10%. Efficiency

            improvement factors from 4% to 30% have  been reported. Ten percent

            is considered conservative.

 

Note 2- Sewer charges are zero, because ozone-treated non-chemical blow-down

            water may be discharged into storm sewers. Upon conversion to ozonated

            system, we reroute blow-down drains to storm sewers, with local

            administration approval.

 

Note 3- Actual savings for a 1,000 ton capacity cooler will depend on the operating

            hours per day (24 hours assumed), actual water cost ($2.50 / 1000 Gal.

            assumed), the actual electricity cost ( 0.08 / KWh assumed), the actual

            load factor ( 80% assumed ), plus additional savings not addressed here

            for reduced labor for cleaning, etc. Assumed rates are somewhat

            conservative.

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