Employing Diverse Materials Or Particular Material In Refrigeration Circuit Patents (Class 62/114)
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Patent number: 5557944Abstract: A lubricant for a refrigerating unit uses a hydrofluorocarbon system refrigerant with a polyol ester system oil as its base oil. The purity of hydrofluorocarbon system refrigerant is set to a level higher than 99.95 wt % and the mixing of chlorine impurity in the system refrigerant is set at a level lower than 80 ppm. The performance and reliability of a refrigerating unit using the hydrofluorocarbon system refrigerant, such as R134a, can be enhanced by making the polyol ester system oil of a chemical compound having particular physical properties, by suppressing the equilibrium water content of refrigeration cycle and by limiting the residual volume.Type: GrantFiled: February 14, 1994Date of Patent: September 24, 1996Assignee: Sanyo Electric Co., Ltd.Inventors: Yutaka Hirano, Takeo Komatubara, Takashi Sunaga, Yasuki Takahashi, Kiyoshi Tanaka, Kiyoshi Akazawa, Masato Watanabe, Seiki Jikuhara
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Patent number: 5558810Abstract: The present invention relates to compositions of pentafluoropropane and a fluorinated propane having from 1 to 5 fluorine atoms; a hydrocarbon having from 1 to 5 carbon atoms; 1,1,1,4,4,4-hexafluorobutane, (CF.sub.3).sub.2 CHCH.sub.3, dimethyl ether; or 1,1,1,2,3,4,4,5,5,5-decafluoropentane. The compositions, which may be azeotropic or azeotrope-like, may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents or displacement drying agents.Type: GrantFiled: November 16, 1994Date of Patent: September 24, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barbara H. Minor, Tuneen E. C. Chisolm
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Patent number: 5551255Abstract: An accumulator distillation insert is provided for allowing the composition f a zeotropic refrigerant to be adjusted based upon a building heat load. The accumulator distillation insert comprises an accumulator, the accumulator having a two-phase input and a vapor output, the accumulator having a refrigerant mixture, in liquid form, disposed at a bottom of the accumulator; an immersion heater is provided in communication with the refrigerant mixture, in liquid form; and a distillation column is disposed in the accumulator, the distillation column is maintained above the refrigerant mixture in liquid form, the distillation column is provided for changing the chemical composition of the refrigerant mixture by decreasing the amount of volatile components in the refrigerant mixture, stored in the accumulator and thereby increasing the capacity of the heat pump system.Type: GrantFiled: September 27, 1994Date of Patent: September 3, 1996Assignee: The United States of America as represented by the Secretary of CommerceInventor: Peter I. Rothfleisch
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Patent number: 5543071Abstract: Nearly azeotropic compositions consisting of hydrogenated fluorocarbons, suitable as freezing mixture in conditioning plants, essentially consisting of:(A) from 38 to 53% by weight of R22;(B) from 34 to 56% by weight of R124 and/or R124A;(C) from 2 to 13.5% by weight of R600 and/or R600A.Type: GrantFiled: August 28, 1995Date of Patent: August 6, 1996Assignee: Ausimont S.P.A.Inventors: Giampiero Basile, Ezio Musso
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Patent number: 5538659Abstract: This invention relates to compositions of a hexafluoropropane and a hydrofluorocarbon, with the hydrofluorocarbon being hexafluoropropane, pentafluoropropane, tetrafluoropropane, trifluoropropane, difluoropropane, fluoropropane, or (CF.sub.3).sub.2 CHCH.sub.3. The compositions, which may be azeotropic or azeotrope-like, may be used as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents or displacement drying agents.Type: GrantFiled: March 21, 1994Date of Patent: July 23, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Tuneen E. C. Chisolm, Barbara H. Minor
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Patent number: 5538658Abstract: Refrigerant compositions include mixtures of pentafiuorodimethyl ether and a second component, wherein the second component is ammonia, dimethyl ether, cyclopropane, propane or propylene.The invention also relates to azeotropic or azeotrope-like composition which comprise admixtures of effective amounts of pentafluorodimethyl ether and ammonia, dimethyl ether, cyclopropane, propane or propylene.Type: GrantFiled: January 27, 1994Date of Patent: July 23, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Barbara H. Minor
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Patent number: 5538660Abstract: In order to replace the chlorodifluoromethane in air conditioning systems, the invention proposes the use, as refrigerant fluid, of a mixture containing by mass from 26 to 34% of difluoromethane, from 56 to 73% of 1,1,1,2-tetrafluoroethane and from 1 to 10% of tetrafluoromethane or octafluoropropane.Type: GrantFiled: June 29, 1994Date of Patent: July 23, 1996Assignee: Elf Atochem S.A.Inventor: Sylvie Macaudiere
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Patent number: 5523011Abstract: The present invention comprises a refrigerant mixture consisting of a first mole fraction of 1,1,1,2-tetrafluoroethane (R134a) and a second mole fraction of a component selected from the group consisting of a mixture of CHClFCF.sub.3 (R124) and CH.sub.3 CClF.sub.2 (R142b); a mixture of CHF.sub.2 CH.sub.3 (R152a) and CHClFCF.sub.3 (R124); a mixture of CHF.sub.2 CH.sub.3 (R152a) and CH.sub.3 CClF.sub.2 (R142b); and a mixture of CHClFCF.sub.3 (R124), CH.sub.3 CClF.sub.2 (R142b) and CHF.sub.2 CH.sub.3 (R152a).Type: GrantFiled: March 11, 1994Date of Patent: June 4, 1996Assignee: California Institute of TechnologyInventor: Jack A. Jones
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Patent number: 5517824Abstract: In a refrigerating cycle using a refrigerant containing hydrofluorocarbon as a main component, of a refrigerant pipe arrangement constituting the refrigerating cycle, a refrigerant pipe extending upward from a lower side to an upper side is made to have an inner diameter not larger than a value which makes the flow rate of the refrigerant be not smaller than a zero penetration flow rate. It is possible to obtain a refrigerating cycle superior in oil returning to a compressor and hence high in reliability, even in the case of using refrigerator oil having no compatibility with a refrigerant containing hydrofluorocarbon as a main component.Type: GrantFiled: July 6, 1994Date of Patent: May 21, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshige Konishi, Susumu Kawaguchi, Hitoshi Maruyama, Yoshihiro Sumida
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Patent number: 5516446Abstract: Substantially constant boiling compositions of 1,1,1,2-tetrafluoroethane and dimethyl ether and its use as a refrigerant, aerosol propellant and polymer foam blowing agent are disclosed.Type: GrantFiled: December 21, 1994Date of Patent: May 14, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Donald B. Bivens, Akimichi Yokozeki
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Patent number: 5512197Abstract: The present invention comprises a refrigerant mixture having two halocarbon components. The first component is present in a mole fraction of about 0.7 to less than 1.0 while the second component is present in a mole fraction of more than 0.0 to about 0.3. The first component is CH.sub.2 FCF.sub.3. The second component can be CHClFCF.sub.3, CH.sub.3 CClF.sub.2, a mixture of CHClFCF.sub.3 and CH.sub.3 CClF.sub.2, a mixture of CHF.sub.2 CH.sub.3 and CHClFCF.sub.3, a mixture of CHF.sub.2 CH.sub.3 and CH.sub.3 CClF.sub.2, or a mixture of CHClFCF.sub.3, CH.sub.3 CClF.sub.2 and CHF.sub.2 CH.sub.3. The preferred embodiment of this invention comprises about 0.7 to less than 1.0 mole fraction CH.sub.2 FCF.sub.3, and more than 0.0 to about 0.3 mole fraction of a mixture of CHClFCF.sub.3 and CH.sub.3 CClF.sub.2. The most preferred embodiment of this invention comprises about 0.7 to less than 1.0 mole fraction CH.sub.2 FCF.sub.3 and more than 0.0 to about 0.3 mole fraction CH.sub.3 CClF.sub.2.Type: GrantFiled: October 21, 1993Date of Patent: April 30, 1996Assignee: The California Institute of TechnologyInventor: Jack A. Jones
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Patent number: 5499508Abstract: An air conditioner employs a refrigerating cycle in which a non-azeotropic mixture of high and low boiling coolants is sealed. The ratio between the high and low boiling coolants of the coolant mixture changes according to a change in the opening of an electric expansion valve 7. A level sensor 19 is arranged in an accumulator 17 that accumulates the liquid phase of the coolant mixture. A value detected by the level sensor is used to calculate the ratio between the high and low boiling coolants actually circulating in the refrigerating cycle. According to the opening of the valve 7 or the ratio between the actual quantities of the high and low boiling coolants, basic operation parameters such as the operation frequency of a compressor 1 are changed. This results in stabilizing and optimizing the operation of the refrigerating cycle even if a cycle temperature or pressure is changed due to a change in the ratio between the high and low boiling coolants of the coolant mixture.Type: GrantFiled: March 30, 1994Date of Patent: March 19, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Yasuhiro Arai, Tetsuo Sano, Tetsuji Yamashita, Takaki Iwanaga, Koichi Goto
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Patent number: 5492643Abstract: An apparatus and method and refrigerant wherein ozone layer-damaging dichlorodifluoromethane is substituted with a mix of less environmentally damaging refrigerants chlorodifluoroethane and tetrafluoroethane in dichlorodifluoromethane-based air-cooling systems. While less environmentally damaging than dichlorodifluoromethane, the substitute refrigerant has a temperature-pressure relationship similar to that of dichlorodifluoromethane, making the substitute refrigerant suitable for use with dichlorodifluoromethane-based air-cooling systems. The refrigerant includes a lubricant which is compatible with dichlorodifluoromethane, chlorodifluoroethane and tetrafluoroethane.Type: GrantFiled: April 26, 1994Date of Patent: February 20, 1996Assignee: Kenneth B. Ruello, Jr.Inventor: Harrison M. Weber, III
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Patent number: 5484546Abstract: Refrigerant compositions include mixtures of hexafluorodimethyl ether and cyclopropane, dimethylether or propylene; bis(difluoromethyl) ether and 2,2,3,4,4-pentafluorooxetane; fluoromethyl trifluoromethyl ether and 2,2,4,4,5,5-hexafluoro-1,3-dioxolane, 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane, dimethylether or tris(trifluoromethyl)amine; trifluoromethyl methyl ether and perfluorooxetane, 2,2,4,4,5,5-hexafluoro-1,3-dioxolane, perfluoromethyl ethyl ether, perfluorodinethoxymethane, 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane, dimethylether or tris(trifluoromethyl)amine; perfluoromethyl ethyl ether and dimethylether, propylene or 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane; perfluorodirnethoxymethane and dimethylether or isobutane; 1-trifluoromethoxy-1,1,2,2-tetrafluoroethane and tris(trifluoromethyl)amine or dimethylether; difluoromethoxy pentafluoroethane and dimethylether, isobutane or tris(trifluoromethyl)amine; 1-trifluoromethoxy-1,2,2,2-tetrafluoroethane and dimethylether or isobutane; 1-difluoromethType: GrantFiled: May 13, 1994Date of Patent: January 16, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barbara H. Minor, Tuneen E. C. Chisolm, Glenn S. Shealy
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Patent number: 5480572Abstract: Refrigerant compositions include mixtures of perfluorooxetane and perfluoromethyl ethyl ether or dimethyl ether; 2,2,4,4,5,5-hexafluoro-1,3-dioxolane and cyclopropane or dimethyl ether; 2,2,3,4,4-pentafluorooxetane and difluoromethyl(trifluoromethyl)sulfide or 1-trifluoromethoxy-2,2,2-trifluoroethane; 2,2,4,4-tetrafluorooxetane and 1-difluoromethoxy-1,1,2,2-tetrafluoroethane or 1-difluoromethoxy-1,2,2,2-tetrafluoroethane; 2,2,3,3-tetrafluorooxetane and 1-difluoromethoxy-1,1,2,2-tetrafluoroethane or 1-difluoromethoxy-1,2,2,2-tetrafluoroethane.Type: GrantFiled: May 13, 1994Date of Patent: January 2, 1996Assignee: E. I. du Pont de Nemours and CompanyInventor: Barbara H. Minor
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Patent number: 5474695Abstract: To replace chlorofluorocarbons as refrigerant fluids, the invention proposes to employ mixtures containing, on a mass basis, approximately 25 to 65% of 1,1,1-trifluoroethane, 1 to 70% of perfluoropropane and 5 to 34% of propane.The mixtures according to the invention can also be employed as aerosol propellants or as blowing agents for plastic foams.Type: GrantFiled: December 23, 1994Date of Patent: December 12, 1995Assignee: d'Elf Atochem S.A.Inventors: Sylvie Macaudiere, Jean-Claude Tanguy
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Patent number: 5474696Abstract: Producing refrigeration by evaporating the fluorocarbon refrigerants 1,1,1,2- and 1,1,2,2-tetrafluoro-2-(difluoromethoxy)ethane in the vicinity of a body to be cooled.Type: GrantFiled: November 10, 1994Date of Patent: December 12, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Donna M. Patron, Allen C. Sievert
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Patent number: 5470496Abstract: A working fluid containing chlorotetrafluoroethane and at least two fluorinated hydrocarbons having a boiling point of not higher than -40.degree. C. under atmospheric pressure selected from the group consisting of methane derivatives and ethane derivatives which consist of one or two carbon atoms, hydrogen atoms and fluorine atoms, which has very small influence on the ozone layer in the stratosphere and decreased flammability and is suitable as a substitute working fluid for chlorodifluoromethane.Type: GrantFiled: May 23, 1994Date of Patent: November 28, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuji Yoshida, Masami Funakura, Kazuo Nakatani, Minoru Tagashira
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Patent number: 5458798Abstract: This invention relates to compositions that include at least one hydrocarbon and at least one fluorinated species. Such compositions may be used as refrigerants, cleaning agents, expansion agents for foams such as polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, displacement drying agents, among others.Type: GrantFiled: January 3, 1994Date of Patent: October 17, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Brooks S. Lunger, Glenn S. Shealy
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Patent number: 5452586Abstract: Certain organic diesters and triesters have been found to be useful as flushing oils in retrofitting CFC-based cooling systems to HFC-based cooling systems. These include compositions of the formulae R.sub.1 OOC--Q--COOR.sub.2, ##STR1## and mixtures thereof, wherein Q is a straight- or branched-chain hydrocarbon group having from 2 to 10 carbon atoms and R.sub.1, R.sub.2 and R.sub.3 can be the same or different and are straight- or branched-chain hydrocarbon groups containing from 6 to 13 carbon atoms. In use as a flushing oil, the lubricating oil is drained, the flushing oil is added and the system is run for about 24 hours. This oil is then drained and fresh flushing oil is added. The process is repeated until the original lubricating oil is within a desired range of the total flushing oil, say up to about 5% wt.Type: GrantFiled: September 19, 1994Date of Patent: September 26, 1995Assignee: Huls America, Inc.Inventor: Sibtain Hamid
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Patent number: 5447646Abstract: Compositions of 2,2-dichloro-1,1,1-trifluoroethane and 1,1,2,2,3-pentafluoropropane, 1,1,2,3,3-pentafluoropropane or 1,1,1,2,3-pentafluoropropane.Type: GrantFiled: November 12, 1993Date of Patent: September 5, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Tuneen E. C. Chisolm, Diana L. Klug, Mark B. Shiflett, Akimichi Yokozeki
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Patent number: 5443745Abstract: A lubricant for a refrigerating machine is here disclosed which comprises a polyoxyalkylene glycidyl ether represented by the general formula ##STR1## wherein B is a residue of a compound having 2 to 8 hydroxyl groups, A.sub.1 O, A.sub.2 O and A.sub.3 O may be identical or different, each of them is an oxyalkylene group having 2 to 18 carbon atoms, R is a hydrocarbon group having 1 to 24 carbon atoms, a is an integer of from 1 to 100, b is an integer of from 1 to 100, c is an integer of from 1 to 100, l is an integer of from 1 to 8, m is an integer of from 0 to 7, n is an integer of from 0 to 7, and l+m+n is an integer of from 2 to 8.The above-mentioned lubricant is excellent in stability in the presence of a FLON refrigerant.Type: GrantFiled: October 6, 1993Date of Patent: August 22, 1995Assignee: Nippon Oil Co., Ltd.Inventors: Tetsuro Sakamoto, Motoshi Sunami, Hiroshi Hasegawa
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Patent number: 5441659Abstract: Compositions of N(CF.sub.3).sub.a (CHF.sub.2).sub.b (CH.sub.2 F).sub.c, where a, b and c are integers from 0 to 3 and a+b+c=3, and C.sub.n F.sub.m H.sub.2n+2-m, where n is an integer from 1 to 3 and m is an integer from 1 to 8, are disclosed. Also disclosed are compositions of N(CF.sub.3).sub.3 and butane, cyclopropane, dimethyl ether or isobutane. These compositions are useful as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents.Type: GrantFiled: November 12, 1993Date of Patent: August 15, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Barbara H. Minor
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Cryogenic mixed gas refrigerant for operation within temperature ranges of 80.degree.K- 100.degree.K
Patent number: 5441658Abstract: A mixed gas refrigerant for use in the cryogenic range of temperatures between 80.degree. K. and 100.degree. K., with single stage compressor providing high pressures up to 30 Arms. The refrigerant consists of nitrogen between 30 and 50 molar percent, methane less than 20 molar percent, propane, more than 30 molar percent, and ethane the balance.Type: GrantFiled: November 9, 1993Date of Patent: August 15, 1995Assignee: APD Cryogenics, Inc.Inventors: Mikhail Boyarsky, Boris Yudin, Victor I. Mogorychny, Larry Klusmier -
Patent number: 5438849Abstract: An air conditioner or heat pump containing a working fluid comprising tetrafluoroethane and at least two fluorinated hydrocarbons having a boiling point of not higher than -40.degree. C. under atmospheric pressure selected from the group consisting of methane derivatives and ethane derivatives which consist of one or two carbon atoms, hydrogen atoms and fluorine atoms, which has very small influence on the ozone layer in the stratosphere and is suitable as a substitute working fluid for chlorodifluoromethane.Type: GrantFiled: September 15, 1994Date of Patent: August 8, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuji Yoshida, Koji Arita, Masami Funakura
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Patent number: 5433880Abstract: Refrigerant compositions are disclosed which include a first component of bis(trifluoromethyl)sulfide, difluoromethyl(trifluoromethyl)sulfide, pentafluoroethyl sulfur pentafluoride, difluoromethyl sulfur pentafluoride, trifluoromethylsulfur pentafluoride bis(pentafluoroethyl)sulfide and a second component of difluoromethane, 1,1,2,2-tetrafluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,2-trifluoroethane, 1,1-difluoroethane, fluoroethane, dimethyl ether, ammonia, fluoromethyl trifluoromethyl ether, trifluoromethyl methyl ether, 1,1,1,2,2-pentafluoropropane, 2-fluoropropane, cyclopropane, bis(difluoromethyl)ether, 1,1,2,2-tetrafluoropropane, 1,1,1,2-tetrafluoropropane, 1-fluoropropane, 1,1,1,3,3-pentafluoropropane, 1,2,2-trifluoropropane, 2,2-difluoropropane, 1,2-difluoropropane, 1,1-difluoropropane, 1-trifluoromethoxy-2,2,2-trifluoroethane, tris(trifluoromethyl)amine or 1,1,2,2,3-pentafluoropropane.Type: GrantFiled: March 30, 1994Date of Patent: July 18, 1995Assignee: E. I. du Pont de Nemours and CompanyInventors: Barbara H. Minor, Glenn S. Shealy
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Patent number: 5433879Abstract: A working fluid comprising difluoroethane and at least two fluorinated hydrocarbons having a boiling point of not higher than -40.degree. C. under atmospheric pressure selected from the group consisting of methane derivatives and ethane derivatives which consist of one or two carbon atoms, hydrogen atoms and fluorine atoms, which has very small influence on the ozone layer in the stratosphere and is suitable as a substitute working fluid for chlorodifluoromethane.Type: GrantFiled: September 23, 1993Date of Patent: July 18, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuji Yoshida, Koji Arita, Masami Funakura
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Patent number: 5429760Abstract: Compositions containing trifluoromethane and 1,1,1,2-tetrafluoroethane which are useful as refrigerants in refrigerating machines and air-conditioning systems.Type: GrantFiled: July 12, 1993Date of Patent: July 4, 1995Assignee: Solvay Fluor und Derivate GmbHInventors: Reinhold Doering, Hans Buchwald, Christoph von Eynatten
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Patent number: 5425890Abstract: A mixed gas refrigerant for use as a replacement for CFC refrigerants, and specifically, for R-12, which includes at least three components including R-134a, R-124, and n-butane.Type: GrantFiled: January 11, 1994Date of Patent: June 20, 1995Assignee: APD Cryogenics, Inc.Inventors: Boris V. Yudin, Richard Stevenson, Mikhail Boyarsky, Oleg N. Podcherniev
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Patent number: 5422025Abstract: A refrigerant composition for use in vapor compressing type freezer and the like is disclosed for substituting the refrigerant of CFC series which destroys the ozonic layer. The refrigerant composition of the present invention includes: 65 weight % of liquified nitrogen, 15-20 weight % of propylene glycol, 8 weight % of ethylene glycol, 2 weight % of an aqueous solution of sodium chloride, and 10-5 weight % of a surfactant. The refrigerant composition of the present invention gives a solution to the problem of the destruction of the ozonic layer.Type: GrantFiled: July 12, 1993Date of Patent: June 6, 1995Assignees: Yohachi Senba, Eiichi SatoInventor: Suk J. Oho
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Patent number: 5419144Abstract: A method of assembling a closed loop refrigerating air conditioning system using a hydrofluorocarbon refrigerant by applying a first oil which is insoluble with the hydrocarbon refrigerant to components of a compressor, and storing the insoluble oil within the housing of the compressor in a single or mixed state.Type: GrantFiled: June 13, 1994Date of Patent: May 30, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
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Patent number: 5417871Abstract: Refrigerant compositions include mixtures of difluoromethane and isobutane, butane, propylene or cyclopropane; pentafluoroethane and propylene or cyclopropane; 1,1,2,2-tetrafluoroethane and propane; 1,1,1,2-tetrafluoroethane and cyclopropane; 1,1,1-trifluoroethane and DME or propylene; 1,1-difluoroethane and propane, isobutane, butane or cyclopropane; fluoroethane and propane or cyclopropane; 1,1,1,2,2,3,3-heptafluoropropane and butane, cyclopropane, DME, isobutane or propane; or 1,1,1,2,3,3,3-heptafluoropropane and butane, cyclopropane, isobutane or propane.Type: GrantFiled: March 11, 1994Date of Patent: May 23, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Barbara H. Minor, Donald B. Bivens, Brooks S. Lunger
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Patent number: 5410887Abstract: A mixed-refrigerant comprising two or more types of refrigerants having different boiling points is enclosed in a refrigerating cycle and a capacitance sensor is used as a device for detecting a composition of the mixed-refrigerant. The electrostatic capacitance sensor is disposed in an evaporation portion of the refrigerating cycle. The refrigerating cycle has a refrigerant composition calculating device for calculating a composition of the refrigerant in the refrigerating cycle in accordance with an output signal from the capacitance sensor and an adequate composition judging device for judging whether or not the composition of the mixed-refrigerant circulating in the refrigerating cycle is in an adequate state in accordance with an output signal from the refrigerant composition calculating device.Type: GrantFiled: September 30, 1993Date of Patent: May 2, 1995Assignee: Hitachi, Ltd.Inventors: Kazumoto Urata, Kensaku Oguni, Kyuhei Ishibane, Naoto Katsumata
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Patent number: 5408839Abstract: A refrigerant compressor comprises an hermetic type casing. There is refrigerant circulating in the casing. A compression mechanism in the casing has a first and a second part. These parts are made of iron-based metal and nodular cast iron, respectively. The first and the second parts may be coupled slidably.Type: GrantFiled: July 6, 1992Date of Patent: April 25, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Shoichiro Kitaichi, Shinobu Sato
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Patent number: 5402655Abstract: A porous filter having a pore size of no more than 80 .mu.m is provided in a refrigerant flow passage of a refrigeration system. The filter may be provided in a drier provided in the refrigerant flow passage or in a separate filter casing provided in the refrigerant flow passage. Alternatively, the filter may be provided in the refrigerant flow passage within a sealed casing of a refrigerant compressor which is incorporated in the refrigeration system.Type: GrantFiled: October 25, 1993Date of Patent: April 4, 1995Assignee: Matsushita Refrigerator CompanyInventors: Masao Mangyo, Seishi Nakaoka, Shuichi Yakushi, Shinya Ito, Takao Kawashima, Satoshi Wada, Hideki Kawai
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Patent number: 5403504Abstract: Constant boiling mixtures of pentafluoroethane and difluoromethane are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes, and as power cycle working fluids.Type: GrantFiled: September 10, 1993Date of Patent: April 4, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Donald B. Bivens, Mark B. Shiflett, Akimichi Yokozeki
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Patent number: 5395540Abstract: A mixture of isomers of the formula C.sub.6 F.sup.12, which contains at least 80% by weight of the trans isomer of perfluoro-4-methyl-2-pentene and at most 3% by weight of perfluoro-2-methyl-2-pentene, is suitable as a cooling and insulating medium and can be used as a substitute 1,1,2-trichloro-1,2,2-trifluoroethane.Type: GrantFiled: October 6, 1993Date of Patent: March 7, 1995Assignee: Hoechst AktiengesellschaftInventors: Alfons Gisser, Konrad Von Werner, Joachim Naumann, Heiner Debrodt, Wilfried Becker
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Patent number: 5387357Abstract: Constant boiling azeotropic or azeotrope-like compositions of ammonia and 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, difluoromethane, pentafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane are disclosed that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.Type: GrantFiled: September 25, 1992Date of Patent: February 7, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Mark B. Shiflett, Akimichi Yokozeki
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Patent number: 5385030Abstract: An air conditioner employs a refrigerating cycle involving a compressor 1, an outdoor heat exchanger 5, an indoor heat exchanger 9, an expansion valve 7, and a non-azeotropic coolant mixture composed of high and low boiling coolants sealed in the refrigerating cycle. The outdoor heat exchanger 5 is provided with a first blower 15 and a second blower 17. A speed controller 18 drives and controls the first, and second blowers 15 and 17. The speed controller 18 achieves a first mode to decrease an air quantity to part of the outdoor heat exchanger located on the upstream side of a flow of the coolant smaller than an air quantity to part of the outdoor heat exchanger located on the downstream side of the flow of the coolant, and a second mode to increase the air quantity to the upstream side of the outdoor heat exchanger greater than the air quantity to the downstream side of the outdoor heat exchanger.Type: GrantFiled: March 10, 1994Date of Patent: January 31, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Koichi Kitagawa, Kazuo Saito, Toshio Otaka, Toshihiro Yamamoto, Yoshihiro Ito
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Patent number: 5372737Abstract: The present invention provides for a refrigeration lubricant for use with R-134a refrigerant. The lubrication composition of the invention combines a polyalkylene glycol synthetic lubricant or a polyolester synthetic lubricant with conventional mineral oil. The composition has enhanced lubricity which is unexpected in view of the fact that mineral oil is known to be incompatible with R-134a refrigerant. The lubricant compositions of the present invention are useful to replace the R-12 refrigerant lubricants which are presently in use.Type: GrantFiled: September 17, 1993Date of Patent: December 13, 1994Inventor: Hans O. Spauschus
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Patent number: 5370811Abstract: A working fluid comprising tetrafluoroethane and at least two fluorinated hydrocarbons having a boiling point of not higher than -40.degree. C. under atmospheric pressure selected from the group consisting of methane derivatives and ethane derivatives which consist of one or two carbon atoms, hydrogen atoms and fluorine atoms, which has very small influence on the ozone layer in the stratosphere and is suitable as a substitute working fluid for chlorodifluoromethane.Type: GrantFiled: February 11, 1992Date of Patent: December 6, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuji Yoshida, Koji Arita, Masami Funakura
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Patent number: 5367883Abstract: A refrigeration system, wherein without providing a drier for removing the moisture entering the cycle, stable operation of the refrigeration system is made possible by setting the balanced moisture concentration of the refrigerant during operation to less than 350 ppm by relatively selecting the moisture permeations of the lines upstream and downstream of the compressor and by using a refrigerant with a higher saturated moisture concentration. Further, as the lubricating oil circulating in the freezing circuit mixed in the refrigerant, use is made of one with a saturated moisture concentration higher than that of the refrigerant.Type: GrantFiled: March 1, 1993Date of Patent: November 29, 1994Assignee: Nippondenso Co., Ltd.Inventors: Hisayoshi Sakakibara, Keiichi Kitamura, Shin Honda
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Patent number: 5360566Abstract: A non-toxic, non-flammable refrigerant for use in a closed cycle refrigeration system comprising a major component constituting between 75% and 95% by volume of the refrigerant and a minor component comprising between 5% and 25% by volume of the refrigerant. The major component consists of hydrocarbon, either a single hydrocarbon or mixtures of hydrocarbons. The minor component consists of constituents serving as both refrigerant and as flame retardants.Type: GrantFiled: November 6, 1992Date of Patent: November 1, 1994Assignee: Intermagnetics General CorporationInventor: Richard Stevenson
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Patent number: 5355695Abstract: A refrigeration device comprising a compressor, a condenser, an evaporator, an accumulator and a refrigerant is described. Lubricating oil present in the compressor is chosen so as to be insoluble with the refrigerant, and a particular accumulator design is described to ensure return of oil back to the compressor.Type: GrantFiled: November 30, 1992Date of Patent: October 18, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
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Patent number: 5351499Abstract: A refrigerant composition capable of attaining a temperature as low as -80.degree. C., without using regulated refrigerants having a high potential of destroying the ozonosphere and capable of being used as a substituent refrigerant for R503 in view of refrigerating or other performance is provided. A refrigerant composition comprises an azeotropic mixture of trifluoromethane and hexafluoromethane.Type: GrantFiled: April 9, 1993Date of Patent: October 4, 1994Assignee: Sanyo Electric Co., Ltd.Inventor: Kazuo Takemasa
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Patent number: 5351501Abstract: A method is presented for the transfer of heat from a low to a higher temperature, in that the main medium in gas form is heated and compressed, after which this main medium is conducted to a first heating chamber (1) where heat at low temperature is added to the main medium, whereafter the gas is conducted to a compressor (8) and compressed, in that before being conducted to the first heating chamber (1), the main medium can undergo a pressure drop and a possible heat absorption in a heat exchanger. In the first heating chamber (1), there is added an auxiliary medium in liquid form which evaporates together with the heating of the main medium, so that after the heating the main medium is more or less saturated with the auxiliary medium in vapor form, in that the heat is added from a second heating chamber (2) in which a gaseous medium containing evaporated auxiliary medium is cooled for the condensation of the auxiliary medium.Type: GrantFiled: December 17, 1992Date of Patent: October 4, 1994Inventor: Benny Petersen
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Patent number: 5340490Abstract: Azeotrope-like compositions comprising trifluoromethane and carbon dioxide or trifluromethane, hexafluoroethane and carbon dioxide are stable and have utility as refrigerants for heating and cooling as well as fire extinguishing compositions.Type: GrantFiled: July 14, 1993Date of Patent: August 23, 1994Assignee: AlliedSignal Inc.Inventors: Barbara R. Decaire, Peter B. Logsdon, Earl A. E. Lund, Ian R. Shankland, Rajiv R. Singh, David P. Wilson, Raymond H. P. Thomas
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Patent number: 5337572Abstract: A closed cycle refrigerating system for cryogenic temperatures using a single stage compressor with a refrigerant comprising a gas mixture. The refrigerating system includes a heat exchanger having a throttling orifice which is arranged to provide refrigeration, and a single stage oil lubricated compressor for compressing the refrigerant. The compressor is typically of the rolling piston type. The refrigerant is a mixture of at least one cryogenic gas having a normal boiling point below 120 degrees K and at least two other gases having normal boiling point temperatures below 300 degrees different from each other and from said one gas. There is also included means for cooling the compressed refrigerant and for circulating the cooled refrigerant to the heat exchanger and its throttling orifice and then back to the compressor. The system does not require any cascaded heat exchangers or intermediate phase separators.Type: GrantFiled: May 4, 1993Date of Patent: August 16, 1994Assignee: APD Cryogenics, Inc.Inventor: Ralph C. Longsworth
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Patent number: 5335510Abstract: An improved apparatus for staging solid-vapor complex compounds comprises heat exchange means for transferring heat from super-heated refrigerant vapor from a desorbing reactor to cooled refrigerant vapor directed to an adsorbing reactor. In another embodiment a liquid subcooler is used to cool liquid refrigerant passing from a condenser to an evaporator with cold refrigerant gas directed to an adsorbing reactor from the evaporator.Type: GrantFiled: May 27, 1993Date of Patent: August 9, 1994Assignee: Rocky ResearchInventors: Uwe Rockenfeller, Lance D. Kirol
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Patent number: 5332546Abstract: Working fluid for absorption heat pumps operating at very high temperature, particularly 200.degree. to 1000.degree. C., said working fluid being a mixture of at least two constituents, characterized in that the working fluid is constituted by a mixture of at least two chemical elements, whereof the first called the "solvent" is much more volatile than the others called "solutes" at the temperature of the mixture, the nature and proportions of each of the chemical elements in the mixture being chosen in such a way that the Vapour pressure of the mixture is significantly below that of the first, more volatile chemical element throughout the operating cycle of the working fluid in the pump.These chemical elements can in particular be metals such as mercury or sodium, or metalloids such as sulphur.Type: GrantFiled: December 10, 1991Date of Patent: July 26, 1994Assignee: Commissariat a l'Energie AtomiqueInventors: Pierre Le Goff, Bai Q. Liu, Dimitrios Antonakas, Gabriel Marbach