• High Efficiency Inverter-controlled Centrifugal Chillers

High Efficiency Inverter-controlled Centrifugal Chillers

Hitachi High Efficiency Inverter-controlled Centrifugal Chillers realize energy-saving operation through out the year utilizing variable motor speed control with inverter unit, drastically improving partial load efficiency under low cooling water temperature condition in off-peak seasons. In addition, the chillers have many unique energy saving functions which satisfy the customers’s demand to minimize the energy consumption.

Features

Features of Hitachi High Efficiency inverter Controlled Centrifugal Chiller

Hitachi High Efficiency Inverter Controlled Centrifugal Chiller

Hitachi High Efficiency Inverter-controlled Centrifugal Chillers realize energy-saving operation through out the year utilizing variable motor speed control with inverter unit, drastically improving partial load efficiency under low cooling water temperature condition in off-peak seasons.
In addition, the chillers have many unique energy saving functions which satisfy the demand to minimize the energy consumption.

Excellent COP at Partial Load

Various technologies such as newly developed high efficiency economizer (cyclonic system), etc. enabled drastic improvement of the efficiency at partial load with low cooling water temperature. Improvement of the oil supply temperature control and the automatic oil recovery enables extension of the motor speed control range at low cooling water inlet temperature.




Improvement of the Oil Supply Temperature Control

When the compressor rotation speed is low, the friction heat generated at bearings decreases.
Therefore, refrigerant flow to oil cooler is controlled to keep the oil temperature property.

Energy & Power Saving Operation Functions

"Eco Mode" Operation (Chilled Water Inlet Temp. Control)

The chiller is usually controlled so the chilled water outlet temperature to be constant.
This "Eco Mode" operation introduces the inlet temperature control, where the chilled water inlet temperature is controlled to be constant.
The outlet temperature rises a bit but this is enough for the off-peak season air conditioning.


"Energy Saving Mode" Operation (Peak Cut Operation) (option)

Once the target motor power consumption is set, the chiller is automatically controlled by the motor speed, the inlet guide vane opening and the chilled water outlet temperature rise.
This control is extremely useful for the energy saving especially in the off-peak season when the motor speed is easily decreased.


Cooling Water Variable Flow Operation (option)

When the cooling water variable flow control is applied, the cooling water flow rate is automatically calculated so the total power consumption of the compressor motor and the cooling water pump motor becomes minimum.


Feature of Low Voltage Inverter (380V~460V)

  • Light and concept structure do not choose installation location.
  • Inverters equipped with DC reactor to is moderate high frequency wave.
  • Harmonic filter can be supplied to comply with higher level regulation for total harmonic distortion. (e.g. IEEE 519) (Option)