Abstract: A water evaporating air conditioning, indirect heating and recuperative ventilation system comprising an air to air counter-flow heat exchanger having separate supply and return heat exchange chambers that are separated by a heat exchange membrane, water in air saturation elements and air movement means is provided. Air from the external environment is supplied through supply heat exchange chamber to enclosed space and air from enclosed space is moved through return heat exchange chamber and then expelled to the external environment. In air conditioning, water is evaporated inside the return heat exchange chamber and heat is conducted across heat exchange membrane from the air in supply heat exchange chamber to cool air supplied to enclosed space. In heating, heat is provided to air from enclosed space before that air enters return heat exchange chamber and air supplied to enclosed space is heated by heat conduction across heat exchange membrane and heating of the air in supply heat exchange chamber.

Abstract: An evaporative cooler air conditioning system comprising an air-to-air counter-flow heat exchanger having separate dry cooling and wet evaporating chambers, air saturating elements, and air movement devices. Ambient supply air or other fluid is forced through the dry cooling chamber of the heat exchanger and exits, after transferring through the heat exchanger, into the cooled spaced or room to be cooled. The air in the cooled space absorbs heat from the heat load and reaches an equilibrium at a warmer temperature, and is then forced directly through the wet evaporative chamber of the heat exchanger where it is heavily saturated with water or other liquid.