Patents by Inventor Otto Kristian Sonju
Otto Kristian Sonju has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10260778Abstract: A plant for exploiting geothermal energy by circulating water or another fluid through a non-porous geological formation at a substantial depth below the earth surface, comprising multiple heat absorbing/production holes penetrating the said formation, with a total length of several kilometers and spaced more than 50 m apart. The production holes are connected to the surface by one single combined supply and return hole in which upward and downward flow is separated by a pipe comprising an insulating material and a seal. At the given positions of the common supply and return hole manifold zone designs connect the hole to the multiple production holes. The supply and return holes and production holes are closed circuits for transport of a fluid such as water through the said formation. A method for designing and establishing the plant is also disclosed.Type: GrantFiled: August 27, 2014Date of Patent: April 16, 2019Assignee: GEOVARME ASInventors: Otto Kristian Sønju, Bjørn Halmrast, Per Thomas Moe
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Patent number: 9732981Abstract: The present invention relates to a method and equipment for recovering heat from exhaust gas removed from an industrial process, such as an electrolysis process for the production of aluminum. Heat is recovered by means of an extraction/suction system, where the exhaust gas contains dust and/or particles. The heat is recovered as the exhaust gas being brought into contact with heat-recovery elements. Flow conditions and the design of the heat recovery elements are such that the deposits of the dust and/or particles on the surfaces stated are kept at a stable, limited level. In preferred embodiments, the heat-recovery elements have a circular or an extended, elliptical cross-section and may be equipped with fins or ribs.Type: GrantFiled: November 25, 2013Date of Patent: August 15, 2017Assignees: NORSK HYDRO ASA, NTNU TECHNOLOGY TRANSFER ASInventors: Erling Naess, Otto Kristian Sonju, Torbjorn Slungaard, Bjorn Petter Moxnes
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Publication number: 20160245550Abstract: A plant for exploiting geothermal energy by circulating water or another fluid through a non-porous geological formation at a substantial depth below the earth surface, comprising multiple heat absorbing/production holes penetrating the said formation, with a total length of several kilometers and spaced more than 50 m apart. The production holes are connected to the surface by one single combined supply and return hole in which upward and downward flow is separated by a pipe comprising an insulating material and a seal. At the given positions of the common supply and return hole manifold zone designs connect the hole to the multiple production holes. The supply and return holes and production holes are closed circuits for transport of a fluid such as water through the said formation. A method for designing and establishing the plant is also disclosed.Type: ApplicationFiled: August 27, 2014Publication date: August 25, 2016Inventors: Otto Kristian SØNJU, Bjørn HALMRAST, Per Thomas MOE
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Publication number: 20140069625Abstract: The present invention relates to a method and equipment for recovering heat from exhaust gas removed from an industrial process, such as an electrolysis process for the production of aluminium. Heat is recovered by means of an extraction/suction system, where the exhaust gas contains dust and/or particles. The heat is recovered as the exhaust gas being brought into contact with heat-recovery elements. Flow conditions and the design of the heat recovery elements are such that the deposits of the dust and/or particles on the surfaces stated are kept at a stable, limited level. In preferred embodiments, the heat-recovery elements have a circular or an extended, elliptical cross-section and may be equipped with fins or ribs.Type: ApplicationFiled: November 25, 2013Publication date: March 13, 2014Applicants: NTNU TECHNOLOGY TRANSFER AS, NORSK HYDRO ASAInventors: Erling NAESS, Otto Kristian SONJU, Torbjorn SLUNGAARD, Bjorn Petter MOXNES
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Patent number: 8292615Abstract: A method for burning gas in a burner, including leading the gas through an inner fuel tube and introduction of combustion air through an annular space surrounding the inner fuel tube. This space forms of an outer tube terminated by a conically converging section, wherein the end of the inner fuel tube forms a burner head. The major part of the primary gas is introduced into the upstream end of the burner head, to go into the combustion air that flows past the burner head, whereas a smaller part of a secondary gas is introduced into the free end of the burner head and into the constricted part of the annular channel that surrounds the burner head. The gas flow is accelerated past the burner head due to the reducing cross section and is burned downstream in relation to the burning head.Type: GrantFiled: January 10, 2007Date of Patent: October 23, 2012Assignee: Norwegian University of Science and Technology (NTNU)Inventors: Øystein Spangelo, Otto Kristian Sonju, Torbjorn Slungaard, Mario Ditaranto
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Publication number: 20090220899Abstract: A method for burning gas in a burner, including leading the gas through an inner fuel tube (13) and introduction of combustion air through an annular space surrounding the inner fuel tube. This space forms of an outer tube (11) terminated by a conically converging section, wherein the end of the inner fuel tube forms a burner head (15). The major part of the primary gas is introduced into the upstream end of the burner head, to go into the combustion air that flows past the burner head, whereas a smaller part of a secondary gas is introduced into the free end of the burner head (15) and into the constricted part of the annular channel that surrounds the burner head. The gas flow is accelerated past the burner head due to the reducing cross section and is burned downstream in relation to the burning head, wherein the mixture has properties that reduces the formation of Nox at the same time as the combustion becomes complete. It is also described a burner for performing this method.Type: ApplicationFiled: January 10, 2007Publication date: September 3, 2009Applicant: NTNU TECHNOLOGY TRANSFER ASInventors: Øystein Spangelo, Otto Kristian Sonju, Torbjorn Slungaard, Mario Ditaranto
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Publication number: 20080099185Abstract: The present invention relates to a method and equipment for recovering heat from exhaust gas removed from an industrial process, such as an electrolysis process for the production of aluminium. Heat is recovered by means of an extraction/suction system, where the exhaust gas contains dust and/or particles. The heat is recovered as the exhaust gas is brought into contact with heat-recovery elements. Flow conditions and the design of the heat recovery elements are such that the deposits of the dust and/or particles on the surfaces stated are kept at a stable, limited level. In preferred embodiments, the heat-recovery elements have a circular or an extended, elliptical cross-section and may be equipped with fins or ribs.Type: ApplicationFiled: July 15, 2005Publication date: May 1, 2008Inventors: Erling Naess, Otto Kristian Sonju, Torbjorn Slungaard, Bjorn Petter Moxnes