SELECTION AND INSTALLATION OF RERIGERATION SYSTEMS

In a refrigeration system, the major consideration is the heat load calculation. There are five general factors that affect the refrigeration heat-load estimate required for a particular application.

Heat transmission load. This leakage occurs through walls, doors, ceilings, and floor space into the space being refrigerated. Insulation factor. This is the rate of heat transfer that occurs through insulating material. Air change load. This factor is determined by the frequency with which a door is opened and closed and the length of time a door is left open. Product load factor. This is determined by the types of products being stored and product temperature at time of storage.

Miscellaneous factor. This includes such factors as exposure to direct sunlight and ambient temperature surrounding the system.

There are several charts and graphs available that depict the relationship between the factors listed above. To do the job right, you must take into consideration the total effect of the factors before selecting a particular refrigeration system.

SPECIAL TYPES OF REFRIGERATION SYSTEMS

There are certain applications where an electrically powered refrigeration system cannot be used. This requires knowledge of special applications and selection of a refrigeration system that will work effective . The absorption and the expendable refrigeration systems are discussed in this section.

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