Dimensions of the evaporator air conditioners are divided into two categories:
Finned-Tube the coil is placed in the flow of the air handling unit. Refrigerant evaporates. Refrigerant in the pipes and the air flowing around the fins attached pipes to draw heat from the air. It is usually called direct expansion refrigeration system (see Fig. 10-4).
Shell-and-tube Chillers are used for cooling water for cooling purposes. As a rule, the refrigerant is in tubes mounted inside the tank, or the shell containing water or liquid cooling. The refrigerant pipes draws the heat through the walls of the tube and the fluid as it flows around the pipe in the shell. This system can be cancelled. Thus, the water in the pipes and the refrigerant is in the tank. As the gas passes through the tank over the tubes, it would draw heat from the water in the tube (see Fig.
Fig. l0-5 shows how the K-12 used in the standard vapor-compression refrigeration cycle. System of water for air conditioning and other uses is cooled as it flows through the evaporator tubes. Heat is transferred from the water to the low-temperature, low-pressure refrigerant. The warmth from the water causes the refrigerant evaporates. Refrigerant vapor is drawn into the first stage of the compressor in the amount of controlled size guide opening. At the first stage of the compressor increases the temperature and pressure of steam. This couples, plus a couple of flash-economizer, into the second stage of the compressor. There, the saturation temperature of the refrigerant rises above the water capacitor.
This mixture of vapour is discharged directly into the condenser. There is relatively cool condenser water removes heat from the steam, causing it to condense again in the liquid. Heated water leaves the system, returning to the tower or other heat rejection device.
Heat exchanger at the bottom of the condenser brings warm condensed refrigerant in contact with the water inlet pipe. These cold-water pipes. They can hold no water at a temperature of 55F (13C). This subcools refrigerant, so that when it moves in a cycle, it has a larger capacity cooling. This increases efficiency and reduces power cycle per ton requirements. Liquefied refrigerant leaves the condenser through a plate-control type. It flows in flash economizer or useful capacity. Here, in the normal blinking part of the refrigerant in the steam cools, remaining refrigerant. This outbreak vapor is forwarded directly to the second stage of the compressor. Thus, it does not need to be pumped through the full cycle of compression. The net effect flash economizer is to save energy and reduce operational costs. The second plate-control type flow meters of liquid refrigerant from the program of the vessel back in the cooler, where the cycle begins again (see Fig. 10-6).