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David L. Hagen

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Crosscutting research, development and consulting on energy technologies, sustainable development & intellectual property. I have filed 26 US patents with 17 issued. As Chief Scientist for VAST Power Systems, Inc., controlling combustion with water/steam for combined heat and power/...
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experience

Co-developer  
DigiTenna, LLC, February 2006 to January 2009

Filed three patents on DigiTenna's modular Digital UHF/VHF ("DUV") Antennas. These provide 400% higher performance/mass (6 dB/kg advantage) over the competition. They provide much higher VHF performance for similar UHF gain. See specifications and distributors at DigiTenna.com

Co-inventor/IP advisor  
Morgan Aircraft, January 2005 to January 2013



Chief Scientist  
VAST Power Systems, Inc, September 2000 to Present

Developing ultraclean, more efficient, cost effective combined heat and power systems using wet combustion.

Managing Partner  
AcrossTech, December 1993 to Present

Research and technology consulting.

Research Manager  
Hockey Engineering P/L, January 1988 to January 1989

Developed a 200 ton/hr 80 ton mobile alluvial gold mining plant.

education

University of Minnesota-Twin Cities  
PhD, Mechanical Engineering (Design)-Diurnal flywheel energy storage, Jan, 1976 to Jan, 1982


University of Minnesota-Twin Cities  
Master of Science (MSc), Chemistry (Physical), Jan, 1970 to Jan, 1976
Three year best seller on NTIS.

Pacific Lutheran University  
BSc, Physics & Chemistry majors, Jan, 1967 to Jan, 1970


patents

Recovery of Heavy Oil with Steam and Carbon Dioxide      
Inventors: David L Hagen, Ian Wylie, Allan McGuire, Gary Ginter.  Issued November 04, 2010  in us

Combustion gases with relatively high levels of carbon dioxide (CO2), steam, and/or hot water, may be used to improve recovery of heavy hydrocarbons from geologic formations and/or from surface mined materials. These gases reduce the viscosity and/or increase hydrocarbon extraction rates through improvements in thermal efficiency and/or higher rates of heat delivery for a given combustor an capital investment. Such high water/CO2 content combustion gases can be formed by adding water to combustion gases formed by burning fuel. The pressure to inject the combustion gases and extract heavy hydrocarbons may be provided by diverting high pressure expanded gases from wet combustion in a gas turbine, or by reducing the pressure drop across a turbine and using the expanded hot gases for extraction.

Heavy Oil Recovery with Fluid Water and Carbon Dioxide  (7,814,975)    
Inventors: David L Hagen, Ian Wylie, L. Allan McGuire, Gary Ginter.  Issued October 19, 2010  in us

Diluted wet combustion forms a hot process fluid or VASTgas including carbon dioxide (CO2) and fluid water which is delivered to geologic formations and/or to surface mined materials to reduce the viscosity and/or increase hydrocarbon extraction.

Thermogenerator to Remediate Contaminated Sites  (8,162,568)    
Inventors: David L Hagen, Bill Goheen.  Issued April 24, 2012  in us

A remediation system for decontaminating a polluted site that delivers a remediation fluid to the polluted site and receives a contaminated effluent from the polluted site.

Method and Apparatus for Strain Relief in Thermal Liners For Fluid Transfer      
Inventors: David L Hagen.  Issued May 17, 2010  in us

A method of forming a slotted liner, having a wall comprising a plurality of non-axial bending members axially separated by non-axial slots and circumferentially interspersed with bases, for providing strain relief, the method comprising: forming the bending members and the non-axial slots by one of: cutting non-axial slots, and winding a rod; configuring the circumferential lengths of the plurality of non-axial slots and bases relative to the liner circumference; wherein positioning a first base axially adjacent to a non-axial slot; configuring the non-axial slot circumferential length longer than the circumferential length of the first base; and positioning a second base axially adjacent to a first base; providing connections between the pair of bases or leaving uncut the wall between the base pair; configuring the plurality of non-axial slots and adjacent base pairs.

Method and Apparatus for Strain Relief in Thermal Liners for Fluid Transfer      
Inventors: David L Hagen.  Issued March 01, 2012  in us

A method of forming a slotted liner, having a wall comprising a plurality of non-axial bending members axially separated by non-axial slots and circumferentially interspersed with bases, for providing strain relief, the method comprising: forming the bending members and the non-axial slots by one of: cutting non-axial slots, and winding a rod; configuring the circumferential lengths of the plurality of non-axial slots and bases relative to the liner circumference; wherein positioning a first base axially adjacent to a non-axial slot; configuring the non-axial slot circumferential length longer than the circumferential length of the first base; and positioning a second base axially adjacent to a first base; providing connections between the pair of bases or leaving uncut the wall between the base pair; configuring the plurality of non-axial slots and adjacent base pairs.

Partial Load Combustion Cycles      
Inventors: David L Hagen.  Issued December 03, 2009  in us

The part load method controls delivery of diluent fluid, fuel fluid, and oxidant fluid in thermodynamic cycles using diluent, to increase the Turbine Inlet Temperature (TIT) and thermal efficiency in part load operation above that obtained by relevant art part load operation of Brayton cycles, fogged Brayton cycles, or cycles operating with some steam delivery, or with maximum steam delivery. The part load method may control the TIT at the design level by controlling one or both of liquid and/or gaseous fluid water over a range from full load to less than 45% load. This extends operation to lower operating loads while providing higher efficiencies and lower operating costs using water, steam and/or CO2 as diluents, than in simple cycle operation.

Thermodynamic Cycles using thermal diluent  (8,136,740)    
Inventors: David L Hagen, Gary Ginter, Alberto Traverso, Bill Goheen, Allan McGuire, Janet Rankin, Aristide Mas.  Issued March 20, 2012  in us

A thermodynamic system that produces mechanical, electrical power, and/or fluid streams for heating or cooling.

Thermodynamic cycles using thermal diluent  (7,416,137)    
Inventors: David L Hagen.  Issued August 26, 2008  in us

A thermodynamic system that produces mechanical, electrical power, and/or fluid streams for heating or cooling.

Wet Compression Apparatus and Method      
Inventors: David L Hagen.  Issued November 22, 2012  in us

This wet compression invention with a vaporizable fluid mist demonstrates major performance improvements over the relevant art in achieving a high degree of saturation, providing sensible cooling, strongly reducing the temperature increase due to compression work, reducing excess diluent air flow for downstream combustion, reducing compression noise, and increasing the achievable compressor pressure ratio. These improvements are obtained by one or more of: high mist or overspray from a) progressive axial injection of vaporizable fluid along the streamwise compression flow path, and b) transverse vaporizable fluid delivery from stators, rotors, perforated tubes, and/or duct walls, matching the gaseous fluid flow distribution across the compressor stream; c) reducing the compressor cross-sectional flow area of downstream compressor stages relative to up-stream stages, and d) increasing the rate of downstream vaporizable fluid injection relative to the rate of upstream injection, as a function of each compressor stage pressure ratio.

Wet Compression Apparatus and Method  (8,262,343)    
Inventors: David L Hagen.  Issued September 11, 2012  in us

This wet compression invention with a vaporizable fluid mist demonstrates major performance improvements over the relevant art in achieving a high degree of saturation, providing sensible cooling, strongly reducing the temperature increase due to compression work, reducing excess diluent air flow for downstream combustion, reducing compression noise, and increasing the achievable compressor pressure ratio.

Low Emissions Combustion Apparatus and Methods      
Inventors: David L Hagen, Paul Campbell.  Issued December 23, 2010  in us

Clean combustion and equilibration equipment and methods are provided to progressively deliver, combust and equilibrate mixtures of fuel, oxidant and aqueous diluent in a plurality of combustion regions and in one or more equilibration regions to further progress oxidation of products of incomplete combustion, in a manner that sustains combustion while controlling temperatures and residence times sufficiently to reduce CO and NOx emissions to below 25 ppmvd, and preferably to below 3 ppmvd at 15% O2.

Low emissions combustion apparatus and method  (7,788,897)    
Inventors: David L Hagen, Paul Campbell.  Issued September 06, 2010  in us

Clean combustion and equilibration equipment and methods are provided to progressively deliver, combust and equilibrate mixtures of fuel, oxidant and aqueous diluent in a plurality of combustion regions and in one or more equilibration regions to further progress oxidation of products of incomplete combustion, in a manner that sustains combustion while controlling temperatures and residence times sufficiently to reduce CO and NOx emissions to below 25 ppmvd, and preferably to below 3 ppmvd at 15% O2.

Trifluid Reactor  (8,192,688)    
Inventors: David L Hagen, Gary Ginter, Bill Goheen, L. Allan McGuire, Janet Rankin.  Issued June 05, 2012  in us

A thermally diluted exothermic reactor system is comprised of numerous orifices distributed within a combustor by distributed perforated contactor tubes or ducts.

Trifluid Reactor  (7,523,603)    
Inventors: David L Hagen, Gary Ginter, Bill Goheen, Allan McGuire, Janet Rankin.  Issued April 28, 2009  in us

A thermally diluted exothermic reactor system is comprised of numerous orifices distributed within a combustor by distributed perforated contactor tubes or ducts.

Trifluid Reactor  (2009/0180939)    
Inventors: David L Hagen, Gary Ginter, Bill Goheen, Allan McGuire, Janet Rankin.  Issued March 26, 2009  in us

A thermally diluted exothermic reactor system is comprised of numerous orifices distributed within a combustor by distributed perforated contactor tubes or ducts. The perforated contactors deliver and mix diluent fluid and one or more reactant fluids with an oxidant fluid. Numerous micro-jets about the perforated tubes deliver, mix and control the composition of reactant fluid, oxidant fluid and diluent fluid. The reactor controls one or more of composition profiles, composition ratio profiles and temperature profiles in one or more of the axial direction and one or two transverse directions, reduces temperature gradients and improves power, efficiency and emissions. A thermally diluted exothermic reactor system is comprised of numerous orifices distributed within a combustor by distributed perforated contactor tubes or ducts. The perforated contactors deliver and mix diluent fluid and one or more reactant fluids with an oxidant fluid. Numerous micro-jets about the perforated tubes deliver, mix and control the composition of reactant fluid, oxidant fluid and diluent fluid. The reactor controls one or more of composition profiles, composition ratio profiles and temperature profiles in one or more of the axial direction and one or two transverse directions, reduces temperature gradients and improves power, efficiency and emissions.

Aircraft attitude control configuration  (8,302,903)    
Inventors: David L Hagen, Brian Morgan.  Issued November 06, 2012  in us

ontrol surfaces in an aircraft attitude control configuration provide attitude control for an aircraft at hover or low air speed conditions. The aircraft attitude control configuration includes thrusters mounted to an aircraft, a first control surface kinematically coupled to the aircraft downstream of a first thruster to enable a first vector force to be generated by a portion of thrusted air from the first thruster on the first control surface, and a second control surface kinematically coupled to the aircraft of a second thruster. The control surfaces are displaced symmetrically a longitudinal axis of the aircraft. The control surfaces are independently and differentially movable with respect to each other to enable generation of a second vector force by a portion of thrusted air from the second thruster on the second control surface.

Aircraft attitude control configuration  (8,302,903)    
Inventors: David L Hagen, Brian Morgan.  Issued December 13, 2011  in us

Control surfaces in an aircraft attitude control configuration provide attitude control for an aircraft at hover or low air speed conditions. The aircraft attitude control configuration includes thrusters mounted to an aircraft, a first control surface kinematically coupled to the aircraft downstream of a first thruster to enable a first vector force to be generated by a portion of thrusted air from the first thruster on the first control surface, and a second control surface kinematically coupled to the aircraft of a second thruster. The control surfaces are displaced symmetrically a longitudinal axis of the aircraft. The control surfaces are independently and differentially movable with respect to each other to enable generation of a second vector force by a portion of thrusted air from the second thruster on the second control surface.

Aircraft attitude control configuration  (7,581,696)    
Inventors: David L Hagen.  Issued September 01, 2009  in us

An aircraft attitude control configuration enables control surfaces to provide attitude control for an aircraft at hover or low air speed conditions. The aircraft attitude control configuration includes a thruster mounted to an aircraft for thrusting air, a first control surface kinematically coupled to the aircraft at a position downstream of the thruster, and a second control surface kinematically coupled to the aircraft at a position downstream of the thruster, the second control surface being differentially movable with respect to the first control surface such that a portion of the thrusted air from the thruster generates a first vector force on the first control surface and another portion of the thrusted air generates a second vector force on the second control surface, so that the first and the second vector forces provide a net roll moment about the Y-Roll axis.

Modular digital UHF/VHF antenna  (7,911,406)    
Inventors: David L Hagen, Brad Eckwielen.  Issued March 22, 2011  in us

The invention relates to Radio Frequency (RF) antennas suitable for receiving and/or transmitting digital signals in the Ultra High Frequency (UHF) and/or Very High Frequency (VHF) ranges. The invention comprises a modular driven DUV antenna comprising a driven DUV element, an RF signal line RF communicatively connected to the driven DUV element, and an antenna mount supporting the DUV element; and a modular RF signal enhancer, supported by the antenna mount and selected from: an RF amplifier and a passive RF enhancer positioned to enhance the RF performance of the DUV antenna and comprising one of: an RF director, an RF reflector, and an RF booster.

Digital UHF/VHF antenna  (7,626,557)    
Inventors: David L Hagen, Brad Eckwielen.  Issued December 01, 2009  in us

The invention comprises a Digital UHF/VHF (DUV) Antenna with a driven DUV antenna preferably boosted by an amplifier mounted close to the DUV dipole and a DUV signal line with antenna, amplifier, and signal line contacts being conductively bonded. The DUV dipole is preferably enhanced by a VHF enhancer and/or by a UHF enhancer comprising one of a reflective and a directive element. The UHF/VHF enhancer preferably includes an RF booster with a reflective element displaced from the longitudinal axis and near the driven antenna to enhance VHF signals. The DUV antenna is preferably configured for DTV reception in the VHF high band range of 174 MHz to 216 MHz, and in the UHF range of 470 MHz to 698 MHz.