Figure 14-3. Comfort zone chart

of an installation. Figure 14-3 shows the relationship between humidity, temperature and air movement.

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 isdetermined 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.