Abstract: It is disclosed an apparatus (2) for precipitation of water, comprising a plurality of spraying nozzles (4) for ejecting droplets (6); at least one insulated charging electrode (36), arranged adjacent to the plurality of spraying nozzles (4), for ionizing the droplets (6), wherein the charging electrode (36) is connected to a high-voltage direct current power supply (10).

Abstract: Provided herein are air-to-air heat exchangers. In some embodiments, the air-to-air heat exchanger comprises at least one first air passageway extending between a first air inlet and a first air outlet; at least one second air passageway extending between a second air inlet and a second air outlet; at least one heat-conductive wall separating the at least one first air passageway from the at least one second air passageway; and at least one electrohydrodynamic device disposed in at least one of the first and second air passageways for enhancing airflow therein. Also provided herein is a method of using electrohydrodynamic devices to enhance airflow and efficiency of air-to-air heat exchangers.

Abstract: An apparatus for modification of the atmospheric humidity profile via creating updrafts of moistened air is provided. The apparatus is based on a capacitor of a Van der Graaf generator which, with the aid of air ionizers comprising a source of alpha particles, produces a unipolar atmospheric electric current of a magnitude sufficient to achieve selective moisture transport. Operating such an apparatus augments or creates a moisture updraft, which may lead to the formation of new clouds and/or an increase in supersaturation in existing clouds, thus enhancing the development of precipitation and/or facilitating the inflow of the evaporated moisture from a water reservoir inland.

Abstract: The present invention provides an apparatus for weather modification. The apparatus comprises an emitter electrode, means for providing the emitter electrode with an electric charge, electrically coupled to the emitter electrode, an insulating support for supporting the emitter electrode at a predetermined height, and means for earthing the apparatus. The emitter electrode comprises a Malter film. According to another aspect of the present invention an apparatus for weather modification is provided, which comprises a lighter-than-air craft suitable for carrying an emitter electrode, means for providing the emitter electrode with an electric charge, electrically coupled to the emitter electrode, and means for earthing the apparatus. According to still a further aspect of the present invention, a method of increasing the amount of precipitation in a target region is provided.

Abstract: An apparatus for modification of the atmospheric humidity profile via creating updrafts of moistened air is provided. The apparatus is based on a capacitor of a Van der Graaf generator which, with the aid of air ionizers comprising a source of alpha particles, produces a unipolar atmospheric electric current of a magnitude sufficient to achieve selective moisture transport. Operating such an apparatus augments or creates a moisture updraft, which may lead to the formation of new clouds and/or an increase in supersaturation in existing clouds, thus enhancing the development of precipitation and/or facilitating the inflow of the evaporated moisture from a water reservoir inland.

Abstract: An apparatus for modification of the atmospheric humidity profile via creating updrafts of moistened air is provided. The apparatus is based on a capacitor of a Van der Graaf generator which, with the aid of air ionizers comprising a source of alpha particles, produces a unipolar atmospheric electric current of a magnitude sufficient to achieve selective moisture transport. Operating such an apparatus augments or creates a moisture updraft, which may lead to the formation of new clouds and/or an increase in supersaturation in existing clouds, thus enhancing the development of precipitation and/or facilitating the inflow of the evaporated moisture from a water reservoir inland.