Understanding Non-condensables in a Refrigeration System

Explanation:

Non-condensables in a refrigeration system refers to any substances, such as air or moisture, that are not able to condense in the refrigeration process. The presence of such substances can significantly affect the efficiency and function of the system. Non-condensables in a refrigeration system typically result in a higher discharge pressure.

This is because non-condensable gases take up volume in the condenser, thereby reducing the condenser's ability to condense the refrigerant. These gases can 'choke' the refrigeration system, causing the system to work harder to achieve the necessary pressure, resulting in a higher discharge pressure. Proper purging and maintenance are necessary to limit the amount of non-condensables in a refrigeration system.

By reducing the number of non-condensables, the system can work more efficiently and avoid issues such as higher discharge pressure, reduced capacity, and potential system failures.