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66 NACOL product, Accumulator stores the surplus fluid discharged by the pump and is able to return the working fluid instantaneously to the line when actuator requires pressurized fl uid intermittently in the volume beyond pump’spotential output. By using accumulator, it will make it possible that the electric motor will be miniaturized. Moreover, using the accumulator combined with the pressure switch will make it possible to run the electric motor intermittently. Because of that, it will make it possible that the large reduction of electric energy consumption and CO2 exhaust and to restrain the temperature rise of working fl uid. Because of the availability for restraining the temperature rise of working fluid, miniaturize of heat exchanger and prevention of the deterioration of working fluid becomes possible. It is possible that electric motor and the heat exchanger will be miniaturized by using the accumulator. Through saving electric energy consumption running electric motor intermittently, the running cost can be reduced.Installation of NACOL AccumulatorCost DownIntermittent Running or Miniaturize of Electric MotorTop easy maintenance DesignMaintain the pressure even at electrical power failureSaving EnergyLabor ReductionSafety MaintenanceReduction of Electric Energy ConsumptionReduction of CO2 Exhaust AmountReduction of working timePrevention of the working fl uid temp. risingMiniaturizing the heat exchangerPrevent deteriorating the working fl uidComparison of Annual Electric Expense and CO2 Exhaust Amount in case of 10 hrs./day and 250 days operationGeneral UnitInvertor Control UnitUnit with AccumulatorSaving of JPY 13,967General UnitInvertor Control UnitUnit with AccumulatorReduction of 465kgCO2 Exhaust AmountAnnual CO2 Exhaust Amount92kg479kg557kgCO2 Reduction Amount from General Unit465kg78kgー*Calculated by 0.555kg-CO2/kWh.Electric ExpenseAnnual Electric Expense(10 hrs.×250 days)¥2,665¥13,807¥16,632Advantage Amount of Money¥13,967¥2,825ー*Calculated by 1kWh=JPY 16 The hydraulic unit with accumulator and/or the invertor control unit are popular to be used for saving energy. Compare to the general system, it will make it possible to reduce the electric energy consumption by the intermittent running of electric motor and/or the reduction of rotational speed.NACOL manufactured the comparison hydraulic unit and exhibited to "Energy and Environment Exhibition ENEX2008".Temperature of Working FluidUnit with AccumulatorChange of Working Fluid Temperature (7.5 hours)16.0℃ → 31.0℃15.9℃ → 51.5℃15.9℃ → 42.3℃16.2℃ → 22.8℃Temp. Fluctuation with Room Temp. after 7.5 hours8.2℃28.7℃19.5℃ー*The cooler is not used for comparing the temp. rise of working fl uid.Electric Energy ConsumptionUnit with AccumulatorElectric Energy Consumption(7.5 hours)0.50kWh2.59kWh3.12kWhReduction Rate from General Unit84%17%ーComparison of Temperature Change and Electric Energy ConsumptionElectric Energy ConsumptionOperating TimeTemperatureElectric Energy Consumption of Unit with ACC.Electric Energy Consumption of Invertor Control Unit.Electric Energy Consumption of General Unit.Fluid Temperature of Unit with ACC.Fluid Temperature of Invertor Control Unit.Fluid Temperature of General Unit.Room TemperatureSaving Energy by using AccumulatorComparison of Electric Energy Consumption and Temperature of Working FluidInvertor Control UnitGeneral UnitInvertor Control UnitGeneral UnitRoom TemperatureElectric Energy ConsumptionDownUnit with AccumulatorInvertor Control UnitGeneral UnitUnit with AccumulatorInvertor Control UnitGeneral Unit

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