FEIS used to rely solely on water-cooled heat exchanger for cooling, and maintaining consistent operation is quite energy intensive. In 2020, FEIS purchased an air-cooled heat exchanger, which is equipped with 4 fans. The new heat exchanger cools the process fluid by introducing ambient air and allowing heat to transfer from the hot fluid to the cool air. With a hybrid arrangement of air-cooled and water-cooled heat exchangers, both may serve as a fall back. Since air-cooled heat exchanger cools processing fluid with ambient air, there is no need for cooling tower, pump and pipelines, making the device low-maintenance; high in efficiency; water and energy efficient. The upgrade has saved NT$ 27.09 million in annual energy costs.