Systems and methods for controlling non-condensable gases

A method for promoting condensation of vapor, the method comprising:

• providing a condensation surface configured to facilitate condensation of vapor thereon;
• arranging a gas diffusion apparatus comprising a plurality of blades configured to rotate in a plane that is perpendicular to a hub, the gas diffusion apparatus being arranged such that the hub is perpendicular to the condensation surface;
• providing a source of vapor;
• and
• rotating the plurality of blades to promote condensation of the vapor on the condensation surface by reducing an amount of non-condensable gas located adjacent to the condensation surface that impedes condensation of the vapor.

A heat transfer apparatus comprising:

• an evaporation surface configured to evaporate liquid in contact therewith to vapor;
• a condensation surface configured to facilitate condensation of the vapor thereon, the condensation surface being arranged opposite to the evaporation surface;
• and
• a gas diffusion apparatus comprising a plurality of blades configured to rotate in a plane that is perpendicular to a hub, the gas diffusion apparatus being arranged such that the hub is perpendicular to the condensation surface, wherein rotation of the plurality of blades is configured to promote condensation of vapor on the condensation surface by reducing an amount of non-condensable gas located adjacent to the condensation surface that impedes condensation of the vapor.