Refrigerating Systems. Air extraction methods

In principle, there are two ways to clear the air system: manual or automatic. To manually clean, correctly the valve opens hand, allowing the air to escape. This is a common misconception that, when a cloud of gas refrigerant seen discharged into the atmosphere, the system is purified air. The air may still be trapped in the system.

Therefore, many of the cooling system users prefer automatic cleanup. Refrigeration system includes a compressor, condenser, receiver, evaporator and purger (see Fig. 3.35). Of these components, purger, perhaps the least studied and appreciated. In purger is to remove air from the system, thus improving the compressor and condenser operating efficiency.

Two types of automatic purgers are used as follows : (i) non-electrical mechanical and (ii) automatic electronic purgers. The definition of the type automatic purger use-it's a matter of electricity is available on the purger place, and if it is safe to allow electrical components. In non-electrical mechanical components are primarily used in applications where electricity is not available at the time of use or in hazardous applications where electrical components is not allowed. They removed the air, feeling the difference in density of the liquid refrigerant gases. The operator opens and closes the valves start and stop the work of cleaning and ensure its effectiveness.

Electronic devices of automatics of refrigeration purgers are classified as single-and multi purgers. Single point of electronic refrigerated purger mechanical-clean operation with temperature/gas-level monitoring, and control of discharges into the atmosphere. Cleaning is performed manually. Multipoint refrigerated purger will purify the number of points, with the help of the same unit. However, one clear point emptied separately, and in a multidrop purger offers automation, including start-up, shutdown and alarm features. This purger, it's important to choose purger intended for General tonnage of your system. Undersized purgers may cost less initially, but could adversely affect the efficiency of the system and payback period. Some multipoint purgers a microprocessor-based programmable controller, not a clock, timer. The fuzzy logic controller can " learn", when it passes through the system. As purger accumulate air and clean, the controller records and establishes clear priorities for each point in his memory, thus removing air more efficiently.