Case study on HVAC energy efficient optimization and renovation（Part II）: Chilled water system

Starts with the occurrence of backflow in by-pass pipe in a case, illustrates that chilled water of large flow rate and small temperature difference in user side not only affects the chilled water transporting efficiency, but also adversely affects the chiller’s operation. The problem is attributed to the irrational designed demand of terminals and over supply by chilled water system. Both of the terminals and chilled water system differential pressure set points should be optimized in renovation. With an actual example, presents the process of chilled water system diagnosis and renovation and its energy saving effect.