04325223 is referenced by 182 patents and cites 6 patents.

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. The digital computer calculates the instantaneous system operating parameters from the digital signals, compares these parameters to the design parameters, and operates control relays to load and unload compressors to maintain optimum system pressures, to energize and deenergize fans and pumps in accordance with the system requirements, and to produce alarms when non-condensible gases and/or fouled condensers are indicated in the refrigeration system. In systems subject to frost build up on the evaporator, defrost cycles are also controlled by the computer to occur only when necessary.

Title
Energy management system for refrigeration systems
Application Number
6/244161
Publication Number
4325223
Application Date
March 16, 1981
Publication Date
April 20, 1982
Inventor
Robert J Cantley
905 Versailles Ct., Maitland, 32751
FL, US
Agent
Macdonald J Wiggins
IPC
F25D 3/00
F25B 49/00
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