Increasing the efficiency of supplemented ocean thermal energy conversion (SOTEC) systems

Patent metadata

Field	Value
Publication number	US-8991182-B2
Application number	US-85754610-A
Country	US
Kind code	B2
Filing date	Aug 16, 2010
Priority date	Feb 17, 2009
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A system and method for increasing the efficiency of an ocean thermal energy conversion (OTEC) system is described. In some examples, the system collects thermal energy using a solar collector, warms ocean water located within the solar collector, and provides the warmed water to an OTEC system, such as to a vaporizer of a heat engine. In some examples, the OTEC system provides electricity and other energy to another system, creating a cycle of sustainable economic development of energy and resources.

First claim

I claim:

1. An ocean thermal energy conversion system, the system comprising:
a vaporizer configured to receive water from an ocean and vaporize a working fluid using the received water;
a condenser configured to receive water from an area of the ocean lower than the surface area of the ocean and condense vaporized working fluid;
a working fluid passageway, coupled to the vaporizer and the condenser, configured to provide the working fluid to the vaporizer and receive the working fluid from the condenser;
a turbine, coupled to the vaporizer, configured to generate electricity using the vaporized working fluid; and
a solar collector assembly, coupled to the vaporizer, configured to provide water to the vaporizer at a temperature higher than a temperature of the water of the surface area of the ocean, the solar collector assembly including a channel configured to receive ocean water into the solar collector assembly and hold the received ocean water within the solar collector assembly, a solar energy trapping portion surrounding the channel and configured to heat the received ocean water, the solar energy trapping portion configured to be at least partially filled with a gas having a lower thermal conductivity than air to prevent evaporative cooling of the water and the trapped solar energy, and a coupling portion configured to transport the heated ocean water to an ocean thermal energy conversion system, wherein the solar energy trapping portion is formed of a thin film polymer.

2. The system of claim 1 , wherein the solar collector comprises:
a web assembly configured to trap solar energy; and
a channel within the web assembly configured to:
receive the water from the surface area of the ocean;
warm the water received from the surface area of the ocean; and
transport the received water to the vaporizer.

3. The system of claim 1 , wherein the solar collector comprises:
a channel configured to hold water received from the surface area of the ocean; and
an insulated air space at least partially surrounding the channel and configured to capture solar energy in order to raise the temperature of the water held by the channel.

4. The system of claim 1 , wherein the solar collector is a spiral shaped solar collector.

5. An ocean thermal energy conversion system, the system comprising:
a heat engine, wherein the heat engine is configured to generate electricity using ocean water; and
a solar collector, wherein the solar collector is configured to raise the temperature of ocean water received by a vaporizer of the heat engine, the solar collector including a channel configured to receive ocean water into the solar collector and hold the received ocean water within the solar collector, the solar collector including a pressurized insulating space surrounding the channel; and
a device coupled to the solar collector configured to produce and provide pressurized gas to the insulating space.

6. The system of claim 5 , wherein the solar collector is configured to provide ocean water to the vaporizer of the heat engine at a temperature higher than the temperature of ocean water surrounding the solar collector.

7. The system of claim 5 , wherein the heat engine is configured to heat a working fluid within the heat engine using the ocean water received by the vaporizer of the heat engine.

8. An ocean thermal energy conversion system, the system comprising:
a vaporizer configured to receive water from an ocean and vaporize a working fluid using the received water;
a condenser configured to receive water from an area of the ocean lower than the surface area of the ocean and condense vaporized working fluid;
a working fluid passageway, coupled to the vaporizer and the condenser, configured to provide the working fluid to the vaporizer and receive the working fluid from the condenser;
a turbine, coupled to the vaporizer, configured to generate electricity using the vaporized working fluid; and
a solar collector, coupled to the vaporizer, configured to provide water to the vaporizer at a temperature higher than a temperature of the water of the surface area of the ocean, the solar collector including a web assembly configured to trap solar energy and a channel within the web assembly configured to:
receive the water from the surface area of the ocean;
warm the water received from the surface area of the ocean; and
transport the received water to the vaporizer, the channel extending between upper and lower walls of the web assembly that form insulating spaces for trapping solar energy and wherein the upper walls are formed with generally transparent materials and the lower walls are formed with generally opaque materials.

9. An ocean thermal energy conversion system, the system comprising:
a vaporizer configured to receive water from an ocean and vaporize a working fluid using the received water;
a condenser configured to receive water from an area of the ocean lower than the surface area of the ocean and condense vaporized working fluid;
a working fluid passageway, coupled to the vaporizer and the condenser, configured to provide the working fluid to the vaporizer and receive the working fluid from the condenser;
a turbine, coupled to the vaporizer, configured to generate electricity using the vaporized working fluid; and
a solar collector, coupled to the vaporizer, configured to provide water to the vaporizer at a temperature higher than a temperature of the water of the surface area of the ocean, the solar collector including a channel configured to hold water received from the surface area of the ocean and an insulated air space at least partially surrounding the channel and configured to capture solar energy in order to raise the temperature of the water held by the channel, wherein the insulated air space includes a depression configured to hold at least one of a stiffener and weight for lowering a center of gravity of the solar collector.

10. An ocean thermal energy conversion system, the system comprising:
a vaporizer configured to receive water from an ocean and vaporize a working fluid using the received water;
a condenser configured to receive water from an area of the ocean lower than the surface area of the ocean and condense vaporized working fluid;
a working fluid passageway, coupled to the vaporizer and the condenser, configured to provide the working fluid to the vaporizer and receive the working fluid from the condenser;
a turbine, coupled to the vaporizer, configured to generate electricity using the vaporized working fluid; and
a solar collector, coupled to the vaporizer, configured to provide water to the vaporizer at a temperature higher than a temperature of the water of the surface area of the ocean wherein the solar collector is a spiral shaped solar collector, wherein the spiral shaped solar collector includes a polymer netting that extends across the top and bottom of the collector to provide the collector with a self-stabilizing operational feature.

11. The ocean thermal energy conversion system of claim 10 wherein the netting includes tie-lines from the netting that extends across the top of the collector to the netting that extends across the bottom of the collector.

12. The ocean thermal energy conversion system of claim 10 wherein the netting is electrometric.

13. The ocean thermal energy conversion system of claim 10 wherein the solar collector includes both high strength radial cables and circumferential straps for providing additional stabilization.

Assignees

• Mcalister Roy E
• Mcalister Technologies Llc

Inventors

• Mcalister Roy E

Classifications

• F03G6/003

  having a Rankine cycle (F03G6/065 takes precedence) · CPC title

• F03G6/127

  Over-night operation · CPC title

• F03G6/0055

  having other power cycles, e.g. Stirling or transcritical, supercritical cycles; combined with other power sources, e.g. wind, gas or nuclear · CPC title

• F03G7/05

  Ocean thermal energy conversion, i.e. OTEC · CPC title

• F03G6/067

  Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger · CPC title