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Directory:Fellows Thermoacoustic Cycle (TAC) Generator

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To efficiently convert heat into electricity


Lee Fellows' Thermoacoustic Cycle (TAC) Generator uses heat to amplify acoustic waves (sound waves) in a high pressure gas. These amplified acoustic oscillations drive a unique kind of generator and produce electric power. The system can allegedly be built at a very low cost.

The TAC is designed to produce power from almost any source of heat energy. When powered by solar radiation or waste exhaust heat from other systems, the TAC has no polluting gaseous emissions. It can be configured for use with a wide variety of combustible fuels, and burn them efficiently in a low-pressure combustor with very low emissions and a controllable heat signature. It can be configured to burn any combustible fuel, including methane, natural gas, LPG, gasoline, alcohol and fuel oil.

Contents

About

Official Website

Old Domain

"My ISP sold off the io domain name, forcing me to change my website and e-mail information in hundreds of documents." -- Lee Fellows (July 19, 2011 6:23 AM)

Interview

How it Works

Fellows' Thermoacoustic Cycle (TAC) Generator uses heat to amplify acoustic waves (sound waves) in a high pressure gas. These amplified acoustic oscillations drive a unique kind of generator and produce electric power.

Sound waves are simply pressure fluctuations in a gas. These pressure fluctuations can be amplified by heat. The amplified pressure waves can then be used to generate electricity, via driving a piston, which drives a generator.

Plausible heat sources include engeine exhaust, solar energy, process heat, geothermal heat.

Characteristics

Typical Fuel efficiency: 2.66 kWh/lb fuel (0.28 lb/hp-hr) (Net thermal-electric eff. > 40%)

Typical Emissions (w/LPG or NG fuel in catalytic combustor):
NOx = < 2.5 ppm
CO = < 4.0 ppm

Video

(10:26 Minutes)

  • Fellows Thermoacoustic Cycle (TAC) Generator (YouTube; May 13, 2008)

Costs

Cost of capitalized equipment:

  • TAC < $0.25/Watt (W)
  • MEMS-TAR < $0.10/W

Cost of Competing power generation technologies:

  • Fossil fueled: $0.43/W
  • Wind: $1.00/W
  • Nuclear: $3.50/W
  • Photovoltaics: $4.50/W

Advantages

Applications

As a fuel burning engine it is ideal for:

  • Combined Heat and Power Systems (CHP)
  • Hybrid Vehicle Engines
  • UPS and Auxilliary Power Generators

For energy recovery, it may be cost effective for applications involving a significant amount of waste heat, such as:

  • Solar energy - for solar-electric systems
  • Geothermal energy
  • Co-generation - Waste heat from gas turbines and boilers
  • Industrial process waste heat
  • Automotive exhaust heat. Installed in the engine exhaust manifold, it can generate electricity and air-conditioning from the waste heat in engine exhaust, to save fuel and reduce air pollution.

Independent Testing

Patents

Two US patents awarded. Two others ready for filing upon receipt of financing.

Profiles

Company: Fellows Research Group, Inc.

Inventor: Lee Fellows

Coverage

  • THERMOACOUSTIC CYCLE (TAC) GENERATORS - These generators convert waste heat directly into useable electricity. The TAC generator is designed to produce power as a fuel fired primary generator or waste energy recovery system. (ZPEnergy; June 13, 2004)

Comments

See Discussion page

Contact

Fellows Research Group, Inc.
112 Clear Spring Rd.
Georgetown, TX, USA 78628
Phone: (512) 864-2097

Email: frg@prismnet.com

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- PESWiki home page

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