A plate and frame heat exchanger having 140 titanium plates with 14" feed (carbon steel) pipes was used to extract heat from a 7 - 8% brine solution whose temperature ranged 90 - 100 degrees C and hardness varied from 100 to 400 mg/L. The brine solution was cooled using a fresh water which was pumped to the other side of the heat exchanger. Scaling occurred in both sides of the heat exchanger, reducing the heat transfer coefficient by 20% every two weeks. Scale build-up would force the plant to acid clean the heat exchanger every 6 - 8 weeks.
Two Electronic Descaling 2000 units were installed: one on the brine inlet to the plate and frame heat exchanger and the other on the fresh water inlet.