–Centrifugal Chillers
Hitachi centrifugal chillers are designed for durability, resulting in an extended life cycle and reduced maintenance expenses.
– A wide range of systems for different business or building needs
Hitachi offers a wide range of centrifugal chillers with capacities ranging from 300 to 3000RT[1].
- Gear drive models use a gearbox to drive the compressor and are available as fixed speed and VSD (Variable Speed Drive) models. VSD models are more efficient as they moderate the output of the system according to the required load.
- Direct drive models offer enhanced efficiency and reliability because the motor directly drives the compressor speed without use of gears. We offer both Asynchronous Motor drive models (D-GXVG/D-GFVG) and Permanent Magnetic Synchronous Motor drive (M-GXVG/M-GFVG), with Magnetic Synchronous drive models offering greater energy efficiency when operating at lower speed and therefore lower capacity.
- Magnetic bearing centrifugal chillers utilize the latest and most advanced technology in the industry - magnetic levitation technology achieves a frictionless, non-contact state for its components. Hitachi VM series use magnetic bearings to support the spinning rotor of the compressor and leverage centrifugal force to compress refrigerant gas. The compressed gas is then used to cool air or water, making the VM series an efficient and reliable cooling solution.
– Top-tier efficiency ensures remarkable energy savings
Hitachi's centrifugal chillers are known for their top-tier efficiency, providing customers with cost savings on their electricity bills while helping them achieve sustainability objectives. For instance, the gear-driven VSD model GFG-SITSC can achieve a COP of 22.4 and IPLV of 11.5 at partial load.
– Easy operation
A 10.4-inch touchscreen shows key performance and operational metrics plus details of any failures and alarms of the latest six failures and alarms. The touch panel also includes a helpful user guide available in multiple languages.
– Integrate with BMS and VRF systems
Hitachi centrifugal chillers are equipped with a control panel that includes an RS485 communication port[1], providing seamless compatibility with Building Management Systems using the MODBUS RTU protocol. Additionally, they can be seamlessly integrated with a Hitachi VRF system through H-LINK wiring. This integration enables use of a single centralized controller and wiring network across both chiller and VRF systems, enhancing convenience and efficiency.
– Excellent Coefficient of Performance (COP) at part load even in winter condition
The gear-driven VSD models can achieve a COP of 22.4 at part load. The high-efficiency economizer (cyclonic system), improvement of the oil supply temperature control and automatic oil recovery enables extension of the motor speed control range even when the inlet cooling water is at a very low temperature. Therefore, Hitachi centrifugal chillers are can provide reliable cooing operation throughout the year and in all ambient conditions.
– Robust quality and high reliability
Hitachi centrifugal chillers include a range of features to ensure high reliability including:
- A refrigerant economizer added to the 2-stage compressor equipped with 2 impellers. Due to lower rotation speed of 2-stage compression cycle, the chiller can achieve higher compressor efficiency, lower noise and longer bearing life.
- Direct refrigerant cooling of the lubrication oil in the oil cooler, without the need for cooling water piping.
- Surge protection: 2-stage impeller enables stable operation even at low cooling load or under conditions where the water inlet temperature is high.
- Oil supply temperature control: the friction heat generated in bearings fluctuates based on the compressor speed. Therefore, refrigerant is used to maintain the oil at a consistent temperature, whatever the loading on bearings.
– Quiet operation
When evaluating the impact of a chiller unit on the environment, noise is an important factor to consider. Magnet bearing chillers offer low operating noise at only 76dB(A) - 5-10 decibels lower than ordinary centrifugal chillers.
– Environment-Friendly Refrigerant
Our centrifugal chillers use R134a refrigerant with zero GWP (global warming potential) making them suitable for projects with stringent sustainability requirements.
– Footnotes
1. Refers to Gear Driven centrifugal chiller GFG/GXG-S series.
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– Centrifugal Chillers for Commercial Spaces
With over 80 years of experience, we are confident that our range of cooling and heating solutions provides households and businesses with the leading climate control technology to create and maintain the perfect indoor environment. Meeting the evolving requirements of our clients means that we are constantly innovating our systems, resulting in a collection of elegant and efficient options that are designed to adapt to you and the spaces that they inhabit. We cater for all types of projects and offer an extensive range of solutions so that you can find the system right for the job.
To see our ranges of residential and commercial solutions, click here, and if you are interested in receiving more information from a professional installer, find your nearest one using our Partner Locator.
