New patent issued for heat recovery power generator technology

Nov. 12, 2003 — Proe Power Systems, an engine research and development company, announced that it has just received a Notice of Patent Claims Allowance from the U.S. Patent and Trademark Office for its new HRPG heat recovery power generator technology.

Proe Power Systems’ founder and President, Richard Proeschel, said “The revolutionary HRPG technology has the potential to fundamentally change the dynamics of the distributed power generation market by meeting the U.S. Department of Energy (DOE) cogeneration requirements without the need for steam boilers or water heaters.”

Cogeneration is the recovery of the otherwise wasted heat in an engine’s exhaust to generate additional power and/or to extract useful heat for warming buildings or for other heating processes.

Cogeneration is a critical technology for reducing fossil fuel consumption and to thus simultaneously improve the environment while cutting back America’s dependence on foreign oil. The DOE offers incentives to meet its cogeneration requirements.

To date, the DOE cogeneration requirements have been met by using engine exhaust heat to generate steam (to drive a steam engine for additional power) and/or to heat water. This “wet” approach has forced cogeneration vendors to target a small set of prospects.

Steam boilers involve extensive, expensive, safety requirements. Hot water heating is limited to those that have a significant need for thermal energy as part of their operations or those that are able to use hot water heat in existing or newly designed heating systems.

In contrast to the complex “wet” cogeneration approach, Proe Power Systems’ new “dry” HRPG technology provides a “bolt-on” cogeneration solution that simply uses air instead of water or steam.

An existing internal combustion powerplant can be easily modified by connecting the internal combustion engine exhaust into a the HRPG heat exchanger and then coupling the drive shafts of the HRPG engine and the existing internal combustion engine.

The linked engines require no additional controls and the internal combustion exhaust heat then drives the HRPG” engine to produce 15% to 25% additional electrical power from the same amount of fuel. In addition to the power increase, the Proe HRPG engine exhaust is clean hot air having the potential for an additional efficiency gain (exceeding 20%) by simply exhausting it into a building directly or through the building’s existing hot air ducts.

The HRPG technology is available for license. Additional information can be found at

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