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Hitachi in India

Super High Efficiency Type

Hitachi's High Technology and Rich Experience Realized High-Efficiency Chillers.
By employing a three-dimensional blade impeller (2 stages), economizer subcooling cycle and high-performance heat exchanger tubes, Hitachi succeeded in greatly increasing efficiency.

Structure of Model Name
2-stage Compression Cycle
To improve compressor efficiency, refrigerant economizer is added with 2-stage compressor equipped with 2 impellers, as shown in the drawing below. In this case, the refrigerant goes through two expansion devices. When the refrigerant goes through the first device, some of the refrigerant flashes, or become a gas.
The flashed refrigerant is introduced to the compressor between the two stages. In the one-stage compressor cycle without the economizer, all refrigerant flows in the cycle. Comparatively, in the 2-stage compressor cycle the part of the refrigerant is bypassed from the economizer to the 2-stage impeller.
2-stage Centrifugal Chiller Cycle
Surge Protection
Adopting strict criteria specified in JIS for stable operation under high cooling water temperature. 3D 2-stage impeller enables stable operation even at low cooling load or high cooling water inlet temp. which prevents occurrence of surge.
  • Compressor characteristic comparison
* This figure shows general characteristics and does not provide any guarantees as to the performance.
High Reliability Lubrication System
Direct refrigerant cooling of lubrication oil in oil cooler without cooling water piping increases reliability.
Lubrication Oil Supplying System
Wider Operating Range
Stable operation continues even when rise of condenser pressure due to cooling water temperature in hot summer and/ or proceeding of tube fouling.
Example of rising cooling water temperature due to rising ambient temperature
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.
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.
Energy Saving Mode Setting Screen
New Type Economizer
Improvement of vapor-liquid separation performance and significant downsizing are realized by the use of Newly-developed economizer. (cyclonic system)
Compatible with BMS
Chiller control panel is equipped with RS485 communication port and compatible with Building Management System through MODBUS RTU protocol.
Easy Operation with Touch Panel Type Control Panel
10.4 inch color touch panel screen
Monitor various operating data
Indicate trend graph during operation
Trend data for max. 40 hours. (Updated every 1 hour)
Indicate and store operation history for the past 12 hours (Updated every hour)
Indicate and store failure and alarm history (latest 6 times each)
Show Handling Guide in case of failure
Automatic restart function after instantaneous power failure (Option)
Multilingual Languages Indication (Japanese, English, Chinese [Simplified, Traditional], Portuguese)
Download 3-month operation date to USB memory
Global Warming Prevention
Global warming refers to the phenomenon of global rising in average atmospheric temperatures due to increased volume of CO2 and methane as a result of burning fossil fuels such as petroleum and coal. The 1995 IPCC* Report predicted that if the emission of CO2, etc. continued as it was, the atmospheric temperature would rise by as high as 2°C by the end of the 21st century and, as a result, the sea level would rise by apporoximately 50 cm from the present level.
In such circumstances, it is more strongly required to save the energy consumed by air conditioners in order to cut CO2 emission.
* IPCC: Intergovernmental Panel on Climate Change
Ozone layer Protection
Chlorofluorocarbons (CFCs) diffusing in the stratosphere are exposed to ultraviolet rays to be decomposed, separationg chlorine atoms. It is said that separated chlorine atoms combine with oxygen atoms in ozone to destroy the ozone. Because HFC134a has no chlorine atoms, it does not destroy the ozone in the atmosphere.


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