The presence of non-condensable gases (NCGs) like air or nitrogen in a refrigeration system disrupts the normal thermodynamic processes. These gases occupy space within the condenser, raising the condensing pressure and temperature. This elevated pressure requires the compressor to work harder, consuming more energy and reducing the system’s overall cooling capacity. Higher operating temperatures can also degrade lubricating oils and shorten the lifespan of critical components. Furthermore, reduced heat transfer efficiency caused by NCGs can lead to incomplete condensation of the refrigerant, potentially resulting in liquid refrigerant entering the compressor and causing significant damage.
Maintaining a low concentration of non-condensables is crucial for the efficient and reliable operation of any refrigeration system. Historically, the detrimental effects of these gases were recognized as systems transitioned from simpler refrigerants and designs to more complex, multi-component systems where even small inefficiencies could have substantial impacts. Proper system design, installation practices, and regular maintenance, including purging procedures, are essential to minimize NCG ingress and maintain optimal performance. A well-maintained system experiences reduced energy consumption, lower operating costs, and extended equipment life.
