Water cooler GFG-SIT / GXG-SIT / GSG-SIT Series

The GFG/GXG/GSG-SIT series, our high-efficiency inverter-controlled gear-driven centrifugal chillers, enable year-round energy-saving operation by utilizing variable motor speed control with an inverter unit. This improves partial load efficiency, particularly under low cooling water temperature conditions during off-peak seasons. Energy-saving centrifugal chiller with high COP The GFG/GXG/GSG-SIT Series of chillers from Hitachi maintain stable operation even at extremely low cooling water temperatures. With the ability to adjust compressor speed according to seasonal changes in cooling water temperature, these chillers operate with high efficiency throughout the year. Hitachi's energy-saving chillers are ideal for customers seeking year-round cooling operations and a high Coefficient of Performance. Chiller system with excellent COP at partial load Our centrifugal chiller system's efficiency has been significantly improved at partial load and low cooling water temperatures thanks to cutting-edge technologies, including the newly developed high-efficiency economizer (cyclonic system). The oil supply temperature control has also been enhanced, along with automatic oil recovery, enabling an extension of the motor speed control range even at low cooling water inlet temperatures. Improvements to the chiller's Oil Supply Temperature Control When the chiller centrifugal compressor's rotation speed is low, the amount of friction heat generated at the bearings decreases. As a result, the refrigerant flow to the oil cooler is controlled to maintain the oil temperature at the appropriate level.