Automatic control of refrigeration equipment

Overview

ABSTRACT

The purpose of this paper is to describe and understand the automatons and the automatic control and safety devices of the refrigeration installations constituting the cold chain. To optimize and control a refrigeration machine, it is necessary to understand how the components work to regulate the entire refrigeration system.

We will present the operating principles of elements such as the expansion valves supplying the evaporators, the principles of regulation and optimization of a refrigeration system, including frost management. Also, we will review the different strategies to adopt for oil management and we will end with the remote monitoring architectures of these systems. Here components such as compressors and exchangers are not treated.

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AUTHOR

André GAC (réactualisé/complété par Mehdi CHARNI): Engineer from the Conservatoire national des arts et métiers and the Institut français du froid industriel - Member of the French Refrigeration Association

INTRODUCTION

For the automatic control of refrigeration systems, particularly those with high power ratings, we can use conventional devices consisting of electrical wiring and electromagnetic relays, as well as more or less complex electronic devices. At present, the majority of these are PLCs.

In the case of the latter, which are considerably more powerful, signal management differs from that of traditional automation systems; however, their functions are obviously the same, such as regulating temperature, fluid flow, pressure, etc.

The field of PLCs has only just been touched upon, and readers are invited to consult the publications dealing with these systems.

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KEYWORDS

lubrication | defrost | evaporators | remote monitoring | expansion valves

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Automatic control of refrigeration equipment

Temperature setting