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The method commonly used to remove non-condensable gases from a condenser is through the use of vacuum pumps. These pumps create a vacuum within the condenser, thereby reducing the pressure and facilitating the removal of non-condensable gases, such as air, which can negatively impact system efficiency and performance. By maintaining a low pressure environment, vacuum pumps help ensure that condensable vapors can efficiently condense and prevent issues such as decreased heat transfer efficiency and increased back pressure.

In condensers, the presence of non-condensable gases can lead to reduced heat transfer, as these gases occupy space that would otherwise be filled by the vapor to be condensed. Thus, using vacuum pumps is essential for maintaining optimal operating conditions in steam systems, refrigeration systems, and other applications where condensers are employed.

The other methods listed, such as heat exchangers and thermal expansion valves, serve different functions in thermal and refrigeration systems and do not directly deal with the removal of non-condensable gases. Evaporative coolers, while useful for cooling purposes, do not address the issue of non-condensables in the same manner as vacuum pumps do.