COMPRESSION SYSTEM AND COMPRESSORS

The compression system is the basic of operation of the refrigeration units described in this chapter. One must understand the system to accurately diagnose (identify) mechanical difficultties. Many types of compression mechanisms are explained to hlp the service tecnician become familiar with their basic operation.

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The arrangement of the units of study in this chapter will be in the same other as the arrangement of the part in a refrigeration system. Beginning with the evaporator (where the heat absorbed), the squence (order of study) is through the condenser, (liquid receiver, filter -drier, liquid line, refrigerant control and back into the evaporator.

Necessary details concerning the construction and operation of the parts - as well as of various types of these mechanisms- are explained fully. Included are necessary temperature and motor controls. READ MORE...

BASIC REFRIGERATION SYSTEM

Refrigeration system may be classified in several ways: by the type of refrigerant control. type of motor control, compresion system, absorption system and so on. Similiari systems will be group together.

Each basic refrigeration system explanation:
1. Names the system.
2. Shows a schematic diagram of the system.
3. Describes how the system works.
4. Names some common uses.
5. Names the motrol controls used.

It is important that one become familiar with the fundamentaloperating principles of the common system described in this chapter.

The illustrations are not intended to show the expart parts and uses of actual units, instead, they explainthe fundamental of construction and operation. Details and actual uses will be shown and described in lather chapters.......READ MORE...

FUNDAMENTALS OF REFRIGERATION

1. Development of Refrigeration
Modern refrigeration has many applications. The first, and probably still the most importan, is the preservation of food.
Most foods kept at room temperature spoil rapidly. This is due to the rapid growth of bacteria. At usual refrigeration temperatures of about 4.4 o C (40 F), bacteria grow quite slowly. Food at this temperature will keep much longer. Refregeration preserves food by keeping it cold.
Other important uses of refrigeration include air conditioning, beverage cooling and humidity control. Many manufacturing processes also use refrigeration.
The refrigeration industry became important commercially during the 18th century. Early refrugeration was obtained by the use of ice. Ice from lakes and ponds was cut and stored in the winter in insulated storeerooms for summer use.
The use of natural ice required the building of insulated containers or iceboxes for stores, restaurants, and homes.

Ice was first made artificially about 1820 as an experiment. Not until 1834 did artificial ice manufacturing become practical. Jacob Perkins, an American engineer, invented the appartus which was the forerunner of our modern compression system. In 1885 a Germanengineer produced the first absorption type of refrigerating mechanism, although Michael Farady had discovered the principles for it in 1824.
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