Abstract: A system and method for managing energy in large multistage refrigeration systems and the like having a hot gas defrosting system by continuously monitoring operating parameters and controlling to optimize the refrigeration system compressor pressures and defrosting cycles. A multiplicity of remote sensors is disposed at the appropriate points in the refrigeration system to produce analog electrical signals representative of the evaporator air temperature, evaporator refrigerant temperature, and similar temperatures, and pressures such as the head pressure, booster suction pressure, intermediate suction pressure, and the like. A signal processor is provided to receive signals from the sensors, to condition the analog signals, convert to digital signals and to feed a digital computer which has a memory for storing system design pressure and temperature parameters and refrigerant characteristics.

Abstract: A system and method for managing energy in large refrigeration systems and the like by continuously monitoring operating parameters and controlling to optimize the refrigeration system elements. A multiplicity of remote sensors is disposed at the appropriate points in the refrigeration system to produce analog electrical signals representative of various temperatures such as wet bulb temperature, dry bulb temperature, condensing temperature, evaporator air temperature, evaporator refrigerant temperature, and similar temperatures, and various pressures such as head pressure, booster suction pressure, intermediate suction pressure, and the like. A signal processor is provided to receive signals from the sensors, to condition the analog signals, convert to digital signals and to feed a digital computer which has a memory for storing system design parameters and refrigerant characteristics.