Understanding the Impact of Non-Condensables in a Refrigeration System

The Role of Non-Condensables in a Refrigeration System

Non-condensables are gases that do not condense at normal refrigeration pressures and can accumulate in the system over time. These gases, such as air, should not be present in the refrigeration system as they can interfere with its operation.

Impact on Discharge Pressure

When non-condensable gases are present in the system, they do not condense at the typical pressure during the refrigeration process. As a result, they remain in a gaseous state when the refrigerant condenses back into a liquid. This leads to an increase in discharge pressure within the system.

Effect on System Efficiency

The presence of non-condensables can reduce the efficiency of the refrigeration system. During each cycle, these gases are carried to the condenser where the refrigerant is supposed to condense. However, since they do not condense, they accumulate in the condenser, taking up space and reducing the system's capacity. This results in the need for higher pressure to achieve the desired cooling effect, leading to higher discharge pressure.

Overall System Performance

Every component of a refrigeration system is designed to operate efficiently under specific conditions. The presence of non-condensable gases disrupts this balance, resulting in decreased efficiency and performance. It is essential to monitor and maintain the system to prevent the buildup of non-condensables and ensure optimal operation.