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The cost savings calculation is based on lowered head losses as a result of the installation and use of ARI air valves on the system. The results were gathered from tests that were performed over a period of time that reflected the changing working conditions at the pump station. The use of the ARI Air Valves resulted in lowered head losses (h) measured in meters and was characteristic at all the pump stations that installed ARI Air Valves.

  1.  Energy Savings measured during the first half of 2008 at specific pump stations using high-voltage pumps.
    Energy savings in kWh for the first half of the year 2008 was calculated according to the formula:
    Economic Efficiency Calculation 1
    h = measured head loss savings
    Q = water volume 1000m³
    0.7 = pump and motor efficiency
    All calculations based on the rate of 0.7401 Rubles/kWh

    Station Q,
       x1000m³  
    h,(m)
      Head loss saving   
    Energy
      Saving, kWh  
      Cost Saving  
    Rubles
      1              Brateevskaya 8793.0  2.1  71,751 53,103
      2   Vychinskaya 12020.0   2.1 98,083   72,591
      3   Lyblenskaya  45394.0 5.3  934,857  691,888 
      4   Novo-Kuncevskaya   23737.0 6.0   553,411  409,579
      5   Novo-Solncevskaya   26697.2 6.0  622,426   460,657
      6   Ramenskaya  11383.0 2.1   92,885  68,744
      7   Savinskaya  54386.0 2.4   507,188 357,370 
      8  Tushinskaya  31289.0 2.4  291,792   215,955
      9  Filevskaya 104834.0  5.4  2,199,717   1,628,011
     10  Chapilovskaya  100129.0 5.6   2,178,807  1,612,535
     11  Centralnaya  38913.0  4.8 725,783  537,152 
     12  Tcherkizovskaya  94706.0  5.6  2,060,803 1,525,200 
     13  Yugo-Vostochnaya  66301.0  5.1 1,313,896   972,414
      Total: 618582.2    11,651,399  8,623,199 


  2.  Cost Savings measured during the first half of 2008 at specific pump stations using low-voltage pumps.
    Energy Savings in kWh for the first half of 2008 was measured according to the formula:
    Economic Efficiency Calculation 1
    h = measured head loss savings
    Q = water volume 1000m³
    0.7 = pump and motor savings
    All calculations based on the rate of 1.7738 Rubles/kWh

       N     

    Station Q,
       x1000m³  
     h,(m)
      Head loss saving  

     Energy
    Savings.
    kWh 

    Cost
    Savings,
    Rubles 
      1   Losevskaya            4871.5   2.5  86,180  48,585
      2   Marinskaya   6329.8   2.4  106,889  60,260
      3   Novo-
     Kozhuhovskaya
      4280.2   2.4  68,836  38,807
      4   Paveletckaya   3910.0  2.1  59,738  33,678
      5   Severnoe Butovo     5492.6  3.8  145,751    82,169
     6  Chorosheevskaya  2978.6  2.4  47,903  27,006
       Total:   27862.7     515,297   290,505  


    Total for 19 stations:            646444.9                            11,941,904         9,138,496   

    Expected cost savings for one full year:
              23,883,808 kWh                       18,276,992 Rubles


    Cost Savings Calculations at a Moscow Sewage Station After the Installation of ARI Hydraulic Check Valves

    The cost savings calculation is based on lowered head losses as a result of the installation and use of ARI hydraulic check valves on the system. The results were gathered from tests that were performed over a period of time that reflected the changing working conditions at the pump station.
    The use of the ARI Hydraulic Check Valves resulted in lowered head losses (h) = 0.9m Energy savings in kWh for the first half of 2008 was measured according to the formula:
    Economic Efficiency Calculation 1
    Economic Efficiency Calculation f2
    Q = water volume 1000m3
    0.7 = pump and motor savings
    n = number of check valves
    TiPump = work time of one pump during first half of year 2008 
    QPS = total flow at a particular pumping station
    All calculations based on the rate of 0.7401 Rubles/kWh

    Economic Efficiency Calculation 2


    Actual Energy Savings Measurements With the Installation and Use of ARI Air Valves

    Estimated pump energy savings is based on the total specific energy consumption (E) divided by the total volume of water (Q) for a specific time period, With and without the use of ARI Air Valves (U = E/Q).
    To eliminate the influence of different work regimens of the pump station on the savings, a period of 7 days was used for the calculations.

Pump Station with High-Voltage Pumps
Economic Efficiency Calculation 3
Economic Efficiency Calculation 3 1



The energy saving is calculated by the formula:
Economic Efficiency Calculation f3
when: Q x1000m³ = total volume of water for the first half year 2008
and:
 Economic Efficiency Calculation f4
The cost savings is calculated according to the rate of 0.7401 Rubles/kWh for the pump stations with high-voltage pumps and 1.7738 Rubles/kWh for the pump stations with low-voltage pumps.

 Economic Efficiency Calculation 4

 

Actual Energy Savings Calculation with the Installation and Use of ARI Hydraulic Check Valves

Estimated pump energy savings is based on the total specific energy consumption (E) divided by the total volume of water (Q) for a specific time period, With and without the use of ARI Hydraulic Check Valves (U = E/Q).
To eliminate the influence of different work regimens of the pump station on the savings, a period of 4 days was used for the calculations.

Economic Efficiency Calculation 5

 

The savings effect is calculated by the formula:
Economic Efficiency Calculation f3
when: Q x1000m³ = total volume of water for the first half year 2008
and:   Economic Efficiency Calculation f4
The cost savings is calculated according to the rate of 0.7401 Rubles/kWh for the pump stations with high-voltage pumps.

Economic Efficiency Calculation 6