Industrial refrigeration can be found in many types of applications such as food processing, product preservation etc. In many cases, it can represent one of the largest energy consumers in a facility. Studies show that it is possible to reduce energy consumption by up to 40% in industrial refrigeration systems. This paper presents an analysis of the energy conservation opportunities identified in an ammonia-based industrial refrigeration system in a Canadian warehouse. Some of the energy conservation opportunities included in the analysis are: application of a floating head pressure control; application of variable-frequency drives in evaporator fans; optimization of hot gas defrost; heat recovery opportunities from the evaporative condensers; reduction of infiltration of air in cold storage; application of bi-level lighting control in the lamps in the cold storage; and application of screw compressor VFD controls.
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