US 4,355,513 A · Method and apparatus for producing electricity from thermal sea power

Abstract

A method and apparatus of producing useful energy from a large body of water having cold subsurface water and water at the surface which is warmer than the subsurface water. The apparatus comprises a tubular pump to air-lift in a manner to be described cold subsurface water to the surface and which tube is open at the surface and open at the colder subsurface water and wherein a vertically adjustable air jet assembly is arranged within the tube and connected to a compressed air source to release bubbles from the air jet assembly which rise within the tube, entraining cold subsurface water, making it buoyant and cooling the surface. The method of producing useful energy includes the steps of creating an area on the warm surface of a large body of water which is colder than normal by utilizing compressed air to upwell the cold subsurface water by releasing compressed air through an air jet assembly which is vertically adjustable in a vertical conduit having an opening at the lower end and also at the upper end and which is of a length to extend to a depth within the large body of water at which cold subsurface water is located so that, when compressed air is released through the air jet assembly, it rises in the tube from a level which is most efficient entraining water and causing cold subsurface water to rise to the surface and utilizing the temperature gradient between the cooled surface of the water and the normally warmer surface of the water to generate electricity.

Claims10

Dependent claims

An improved method of producing useful energy from the thermal power of a large body of water, having a depth of at least 700 feet and having cold subsurface water and warmer surface water comprising the steps of:

upwelling said cold subsurface water creating an area of cold subsurface water on the surface of said body of water said area being surrounded by the warmer surface water;
and,
positioning a substantially vertical duct within said body of water, said duct having an open lower end located within said cold subsurface water and an open upper end positioned within said warmer surface water;
and,
releaing a multitude of compressed air bubbles through an air jet assembly positioned within the upper portion of said duct to create a buoyant mixture of air bubbles and water above said release point, said buoyant mixture causing a lessened weight of the total water within the duct thereby forcing cold subsurface water into the open bottom end of the duct, rising up within the duct, being mixed with the released air bubbles and finally surfacing at and becoming the surface of said body of water;
and, adjusting the depth of said air jet asembly within said upper portion of said duct until the bubbles' size achieve their greatest lifting power and to adjust the weight difference between the water within the duct and an equivalent volume of water outside the duct thereby adjusting the eddy velocity of the water within the duct;
and,
utilizing the temperature differential between said area having cold subsurface water thereon and said surrounding warmer surface water to generate electricity.

5 more elements

Improved apparatus for producing useful energy from the thermal power of a large body of water having a depth of at least 700 feet and having cold subsurface water and warmer surface water comprising:

air lift pump means for upwelling said cold subsurface water creating an area of cold subsurface water on the surface of said body of water, said area being surrounded by the warmer surface water;
and,
said air lift pump means comprising a duct positioned substantially vertically within said body of water, said duct having an open lower end located within said cold subsurface water and an open upper end located within said warmer surface water, and a source of compressed air, including an adjustable pressure regulating valve, air jet means within the upper portion of said duct for releasing a large number of compressed air bubbles within said duct to create a buoyant mixture of air and water above said air jet means, an air line operatively connected between said air jet means and said compressed air source;
and,
means for adjusting the depth location of said air jet means below the surface of said body of water whereby the size of the air bubbles within said duct achieve their greatest lifting power and for adjusting the eddy velocity of the water within the duct;
and,
means for utilizing said area having cold subsurface water thereon and the surrounding warmer water of said body of water to generate electricity.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for producing electricity from thermal sea power

Life of this patent

Method and apparatus for producing electricity from thermal sea power

Life of this patent

Abstract

Claims10