2.2.1. PLR-based EDOC Approach

For PLR-based EDOC, "PLR significant change" and "chiller operating number change" are used as the events. The PLR is a continuous variable, and a threshold is critical for the event definition [11]. Till now, there is no selection or calculation method on this PLR variation threshold. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) handbook's heating, ventilation, and air conditioning (HVAC) applications (in Section 3.2 of Chapter 42) suggests an example of 10% for the threshold of chilled-water load change. For a certain system, [10] suggested that the threshold of PLR variation can be customized for a better energy performance. This study will choose a suitable threshold from 5% to 10%.
