ABSTRACT
This chapter examines the another important topic that impacts the energy efficiency of equipment due to lack of proper maintenance and due to inefficient control logics, which is about the impact of low return chilled water temperature on chilled water system energy efficiency. It provides the basic definition of low delta T syndrome and investigates some of the possible causes of it that result from lack of maintenance and the ways of mitigating this problem. Preventive actions should be then implemented on a regular basis as maintenance inspections and tasks; those tasks should be defined in the planned maintenance job plans proactively on a predefined frequency. The cost effectiveness of the process should be calculated based on all costs associated with the maintenance job plan compared to the energy saved and the waived low delta T charges imposed by cooling provider.
