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  3. Fan, pump applications

Energy saving

Energy saving

Effect of the energy saving for fan, pump applications

In case of using dampers(modulating valve) for the air/water flow control, motors are always in constant rotation. Therefore, this control method needs a large power.
Fan and pump application have the 'variable torque characteristics'. Its necessary power is proportional to the third power of the rotational speed.
Inverters perform a lot of energy saving effect.


[Example of fan, pump applications]
[Example of Pump for air-conditioning in hotels]

[Example of fan, pump applications]
Example of fan, pump applications

Example of fan, pump applications

[Energy saving effect and amount of CO2 reduction by inverter drive]
- Capacity of fan, pump: 30kW
- Control speed by inverters: 60%

* Efficiency of fan, pump at 100% operation: 92%

* Necessary power of damper control: (60% speed = 84% power)
    30kW/0.92x0.84x24hx365days=239,948kWh

* Necessary power of inverter control: (60% speed = 21% power)
    30kW/0.92x0.21x24hx365days=59,987kWh

* Energy saving effect
    239,948−59,987=179,961kWh

* Amount of CO2 reduction
    0.412/kWhx179,961kWh=74,143.932kg/year



Example of Pump for air-conditioning in hotels]
In this system, The temperature of the chiller inlet is detected. By detecting the temperature of the chiller inlet, this system can control the output power of the cooling water pump.
It is influenced by neither the season nor the number of guests.
The comfortable air-conditioning control and energy conservation are achieved.


Figure: Cooling water pump in hotels


Figure: Operation pattern

[Energy saving effect and amount of CO2 reduction by inverter drive]

* Energy saving effect (Actual value)
    586,875-402,500=184,375kWh

* Amount of CO2 reduction
    0.412/kWhx184,375kWhx75,962.5kg/year


[Calculating conditions]
* CO2 exhaust coefficient: 0.412kg/kWh


>>>Effect of the energy saving for utility equipment
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