MICROPROCESSOR MONITORING OF REFRIGERATION SYSTEMS.

Type of article: Article

Summary

THE AUTHOR DESCRIBES A ROBUST PROGRAMMABLE LOGIC CONTROLLER DESIGNED TO TAKE BOTH SWITCHING INPUTS FROM THERMOSTATS, PRESSURESTATS, ETC, AND ANALOGUE SIGNALS OF PRESSURE, TEMPERATURE, FLOW OR VOLTAGE. THEY ARE EASILY PROGRAMMED TO PERFORM COMPLEX CALCULATIONS ON THESE INPUTS AND PRODUCE A NUMBER OF TYPES OF OUTPUT FOR BOTH CONTROL AND INFORMATION. TYPICAL APPLICATIONS ARE IN PRINTING REGULAR INFORMATION SHEETS GIVING NOT ONLY TEMPERATURES ETC, BUT ALSO CALCULATIONS OF COEFFICIENT OF PERFORMANCE, SO THAT FAULTY OPERATION CAN BE IDENTIFIED. ANOTHER IMPORTANT USE CAN BE IN SELECTED SWITCHING TO KEEP WITHIN A MAXIMUM DEMAND ELECTRICITY TARIFF. A FURTHER USE OF THE FINE AND RELIABLE CONTROL AVAILABLE IS IN PRODUCING WATER AT 274 K (1 DEG C) FOR DAIRY WORK FROM A COMPACT SHELL AND TUBE EVAPORATOR IN WHICH THERMOCOUPLES MEASURE THE ICE FILM THICKNESS INSIDE TUBES. SIMILARLY, AIR-COOLER FROST BUILD-UP CAN BE MEASURED AND DEFROSTING CONTROLLED ACCURATELY. D.W.H.

Details

Original title: MICROPROCESSOR MONITORING OF REFRIGERATION SYSTEMS.
Record ID : 1986-2284
Languages: English
Source: Dairy Ind. int. - vol. 51 - n. 2
Publication date: 1986
Document available for consultation in the library of the IIR headquarters only.

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Indexing

Themes: Defrosting systems;
Chillers
Keywords: Frosting; Automation; Control (automatic); Chiller; Microprocessor; Defrosting