District cooling concept begins by chilling water at a centralized plant. Chilled water is then pumped through a long piping system (typically via an underground means) to heat exchangers in different buildings. The heat exchangers are used to transfer the chilling energy from the water (often called Primary Loop) to customers’ internal building chilled water loop (often call Secondary Loop).
Cold air then is dissipated within the building via a typical Fan Coil unit and Air Handling Unit. Warm water returns to the heat exchangers for a continuous closed loop cooling process again.