EP1078208A1 - Verfahren und vorrichtung zur kälteerzeugung - Google Patents
Verfahren und vorrichtung zur kälteerzeugungInfo
- Publication number
- EP1078208A1 EP1078208A1 EP99924849A EP99924849A EP1078208A1 EP 1078208 A1 EP1078208 A1 EP 1078208A1 EP 99924849 A EP99924849 A EP 99924849A EP 99924849 A EP99924849 A EP 99924849A EP 1078208 A1 EP1078208 A1 EP 1078208A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refrigerant
- oil
- heat exchanger
- joule
- thomson
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/02—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
Definitions
- the invention relates to a method for cooling in the temperature range from 65 to 150 K, in which the refrigerant is compressed with an oil-lubricated compressor, then cooled to ambient temperature and then oil is separated from the refrigerant before the refrigerant is fed to a Joule-Thomson heat exchanger becomes.
- the invention further relates to a device for refrigeration in the temperature range from 65 to 150 K, an oil-lubricated compressor for compressing a refrigerant, a downstream aftercooler for cooling the refrigerant to ambient temperature, a subsequent device for separating oil from the refrigerant and one of the devices has downstream Joule-Thomson countercurrent heat exchanger for separating the oil.
- a gaseous refrigerant is compressed in a compressor from a relatively low pressure (low pressure) to a relatively high pressure (high pressure) and cooled to ambient temperature in an aftercooler.
- the compressed refrigerant is then cooled in a high-pressure stream in a heat exchanger in countercurrent to the not yet compressed refrigerant and finally expanded into the two-phase region of the refrigerant with the aid of a throttle valve.
- the liquid portion of the refrigerant is partially evaporated in an evaporator with absorption of the cooling capacity.
- the refrigerant coming from the evaporator in the low-pressure stream is fed to the countercurrent heat exchanger and warmed up therein by the compressed refrigerant.
- the warmed up refrigerant is then returned to the compressor.
- Mixtures of gases with normal boiling temperatures below 320 K are often used as refrigerants. These include, for example, hydrogen, nitrogen, oxygen, noble gases, hydrocarbons and halogenated hydrocarbons.
- refrigerants include, for example, hydrogen, nitrogen, oxygen, noble gases, hydrocarbons and halogenated hydrocarbons.
- the one before 2 described methods are referred to when using such substance mixtures as refrigerants as "mixture-Joule-Thomson method".
- oil-lubricated compressors To compress the refrigerant, it is advantageous to use an oil-lubricated compressor.
- the maintenance-free period for oil-lubricated compressors is relatively long with over 20,000 operating hours. This ensures high reliability of the entire refrigeration system, since there are no other components with mechanically moving components.
- an oil-lubricated compressor has the disadvantage that oil can get from the compressor into the refrigerant and can thus be carried into the refrigeration cycle. If the oil gets into the cold part of the refrigeration system, it freezes out at the low temperatures that occur in the evaporator and clogs the evaporator. Corresponding components must therefore be connected downstream of the compressor in order to separate oil from the refrigerant after it has been compressed. Because of the relatively high temperatures of the compressed refrigerant, both aerosols and vaporous oil components are generally present in the refrigerant. A liquid oil separator with oil return to the compressor and a downstream adsorber can advantageously be used as a cleaning unit to remove vaporous oil components and the finest droplets still remaining. This arrangement has been described (RC Longworth, MJ Boiarski, LA Klusmier, 80 K Closed Cycle Throttle Refrigerator, Proceedings of the 8th International Conference cryocooler, Vail Co., June 1994).
- An adsorber is a container filled with an adsorbent.
- Solid substances serve as adsorbents, which due to their properties can bind other substances, in this case the oil.
- the adsorption process is an accumulation of molecules from the gaseous or liquid phase on the solid surface of the adsorbent.
- Activated carbon, silica gel and zeolites are primarily used as adsorbents. With a mixture Joule Thomson 3
- the oil droplets and the vaporous oil in the adsorber are deposited on the inner surface of the adsorbent.
- the functioning of an adsorber is discontinuous.
- the adsorber is loaded when the entire inner surface of the adsorbent is from the foreign
- Molecules is occupied. Then the adsorber can no longer fulfill its function. The adsorber is therefore replaced or regenerated at regular intervals. The period between the exchange or regeneration of the adsorber disadvantageously determines the maintenance-free period of the entire chiller. A typical maintenance period is in the range of 5000 to 10000 operating hours.
- Another disadvantage of the adsorber is the selectivity of the adsorbent in relation to certain components of a refrigerant mixture, i.e. its property of differently adsorbing different components (H.
- volume of the adsorber The greater the volume of the adsorber, the greater the disadvantageous influence of the selectivity of the adsorbent on the composition of the refrigerant mixture. Therefore, it does not make sense to use the volume of the adsorber 4 to increase the maintenance-free time in relation to the loading with oil, because at the same time this changes the composition of the refrigerant mixture with generally negative effects.
- the main criterion for selecting the composition is the size and distribution of the temperature difference between high and low pressure flow in the Joule-Thomson heat exchanger.
- the temperature difference should be as small as possible and the distribution of the temperature difference in the heat exchanger should be as uniform as possible.
- Refrigerant mixtures that offer a particularly favorable temperature difference distribution in the heat exchanger are usually not gaseous before entering the Joule-Thomson heat exchanger, but are partially liquefied. This is achieved by adding higher-boiling components such as propane or isoButane (A. Alexeev, H. Quack, Ch. Haberstroh, Low cost mixture Joule Thomson Refrigerator, Cryogenics, Proceedings of the 16 th International Cryogenic Engineering Conference, Kitakyushu, Japan , 1996).
- propane or isoButane A. Alexeev, H. Quack, Ch. Haberstroh, Low cost mixture Joule Thomson Refrigerator, Cryogenics, Proceedings of the 16 th International Cryogenic Engineering Conference, Kitakyushu, Japan , 1996.
- the higher-boiling mixture components usually also have a higher freezing temperature. At low temperatures in the cold section, these components can freeze out and clog the evaporator. For this reason, the proportion of higher-boiling components in the refrigerant mixture should be as low as possible. The advantages of using refrigerant mixtures are not fully exploited, the potential effectiveness is not achieved. This is another disadvantage of the mixture Joule-Thomson method known in the prior art.
- the object of the invention is to increase the effectiveness of the mixture Joule-Thomson process with oil-lubricated compressors.
- the efficiency of the method and the device for cooling is to be increased and the maintenance-free time of an optionally arranged adsorber and thus the device for cooling is to be extended.
- the object is achieved in that the refrigerant is additionally cooled after it has cooled to ambient temperature and before entering the Joule-Thomson heat exchanger.
- the device for the additional cooling is called an oil condenser here.
- an oil condenser Surprisingly, due to the relatively low additional cooling, further oil fractions from the refrigerant flow advantageously condense to a considerable extent.
- the method is particularly advantageously suitable for generating cold in the temperature range from 90 to 110 K.
- the refrigerant is additionally cooled after it has cooled to ambient temperature and before oil separation.
- the refrigerant is additionally cooled after the oil has been separated off and before it enters the Joule-Thomson heat exchanger.
- the refrigerant stream is advantageously cooled in a further heat exchanger (precooler) after the oil has been separated off, so that the refrigerant is partially liquefied in the Joule-Thomson heat exchanger.
- precooler further heat exchanger
- the heat exchangers for cooling the high pressure flow below the ambient temperature, i.e. oil condenser and precooler obtain their cooling capacity advantageously from a refrigeration system.
- liquid oil components are separated from the refrigerant. If the partial pressure of the oil vapors in the flow of the compressed refrigerant after the liquid oil separator is less than approx. 10 "3 mbar or if the desired evaporation temperature is above 120 K, then in the process according to the invention the additional cooling in the oil condenser can advantageously only be carried out with a liquid oil separator as 6
- the refrigerant has a temperature of 233 to 243 K before entering the Joule-Thomson heat exchanger.
- the pressure of the refrigerant before entering the oil-lubricated compressor is 1 to 3 bar, preferably 1.5 to 2.5 bar and particularly preferably 1.6 to 1.8 bar, and that the refrigerant after whose compression in the oil-lubricated compressor has a pressure of 10 to 28 bar, preferably 12 to 18 bar and particularly preferably 14 to 16 bar
- the predominantly liquid oil component has been separated from the refrigerant
- the predominantly vaporous oil component has subsequently been separated from the refrigerant.
- the separation is advantageously carried out with a liquid oil separator and a downstream adsorber, the oil droplets contained in the refrigerant stream being separated in the liquid oil separator and the remaining refrigerant stream being cleaned further with a small amount of vaporous oil in an adsorber.
- the oil vapors from the refrigerant gas after the compression condense out relatively well and are relatively well separated in the liquid oil separator.
- the concentration of the residual oil in the gaseous refrigerant after the liquid oil separator is relatively low, which considerably relieves the pressure on the adsorber. Relatively cold refrigerant flows through the adsorber, thereby cooling it. This increases the specific capacity of the adsorbent in the adsorber compared to prior art methods and the maintenance period of the adsorber and thus the entire device for cooling is extended.
- the proportion of higher-boiling components can advantageously be reduced when using refrigerant mixtures. Because even before entering the Joule-Thomson heat exchanger, such refrigerant mixtures are used 7 partially liquefied. This simultaneously increases the effectiveness of the system and significantly reduces the risk of these components freezing out at low temperatures in the cold part of the system.
- a mixture is used as the refrigerant, which contains nitrogen, methane, propane and ethane or ethylene.
- the mixture preferably contains 25 to 45 mol% nitrogen, 15 to 42 mol% methane, 5 to 15 mol% propane, balance ethane or ethylene.
- the advantage is that the refrigerant mixture consists of relatively few components. Components with normal boiling point at ambient temperature, for example isobutane, are no longer necessary. The development of refrigerant mixtures and maintenance of the refrigerant mixture is thus significantly simplified.
- the object is further achieved by a device for cooling, in which an oil condenser is arranged between the aftercooler and the Joule-Thomson countercurrent heat exchanger.
- the oil condenser is arranged after the aftercooler and before an oil separation device.
- an adsorber is arranged after the device for oil separation and before the Joule-Thomson countercurrent heat exchanger.
- a precooler is arranged after the aftercooler and after the device for oil separation.
- the oil condenser and / or the precooler are integrated as evaporators in a separate refrigeration circuit.
- a heat exchanger is arranged after the device for oil separation or after the adsorber and before the precooler.
- the precooler is designed as a three-flow heat exchanger, through which the coolant flow from the Joule-Thomson heat exchanger and the flow of the cooling medium from the separate cooling circuit are conducted in countercurrent to the coolant flow from the device for oil separation or the adsorber.
- Fig. 2 schematic representation of a variant of the mixture-Joule-Thomson refrigeration apparatus according to Fig. 1 with oil-lubricated compressor and oil return with additional cooling of the high pressure flow.
- FIG. 3 schematic representation of a refrigeration apparatus according to FIG. 1 with an additional adsorber
- Fig. 6 schematic representation of a device without pre-cooler and without adsorber.
- FIG. 1 an apparatus for performing a mixture throttle process is shown. This process can be seen as a modified Joule-Thomson process.
- the device consists of an oil-lubricated compressor 1, an aftercooler 2, a Joule-Thomson heat exchanger 3, a throttle element 4, an evaporator 5, a liquid oil separator 6, a capillary line 8, an oil condenser 9, a precooler 10, a heat exchanger 17 and one Refrigeration system 11.
- the mixture compressed in the compressor 1 is cooled in the aftercooler 2 to ambient temperature.
- the refrigerant is then in the
- Oil condenser 9 pre-cooled to below ambient temperature, the mixture remaining gaseous.
- the subsequent separation of the oil from the refrigerant mixture takes place in two stages. First, oil droplets and oil aerosol are separated in the liquid oil separator 6. The separated oil in the liquid oil separator 6 is fed back to the compressor 1 through a capillary line 8 and the oil circuit is thus closed.
- the high-pressure stream downstream of the liquid oil separator 6 then flows through the heat exchanger 17. From the heat exchanger 17, which is preferably designed as a countercurrent heat exchanger, the high-pressure stream is fed to the precooler 10 and then to the Joule-Thomson heat exchanger 3.
- the refrigerant mixture is cooled by the pre-cooler 10 so that the refrigerant mixture is partially liquefied.
- the high-pressure flow is cooled in the Joule-Thomson heat exchanger 3 in countercurrent to the low-pressure flow and finally expanded in the throttle element 4 into the two-phase region.
- the refrigerant mixture is partially evaporated in the evaporator 5 with absorption of cooling power.
- the refrigerant mixture coming from the evaporator 5 is warmed up in the Joule-Thomson countercurrent heat exchanger 3. This low-pressure flow is fed back to the compressor 1 via the heat exchanger 17.
- the cold for the oil condenser 9 and the pre-cooler 10 is provided by at least one additional cooling system 11. 10
- the refrigeration system 11 preferably consists of a compressor 12, a condenser 13 and the throttling elements 14 and 15.
- a further throttling element 16 can be arranged in the line after the oil condenser 9.
- FIG. 2 shows a development of the device shown in FIG. 1 for carrying out a mixture throttle process.
- the precooler 10 after the liquid oil separation in the liquid oil separator 6 is designed here as a three-flow heat exchanger, through which the low-pressure flow from the Joule-Thomson heat exchanger 3 and the pre-cooling medium flow from the refrigeration system 11 in countercurrent to the high-pressure flow, and as a result the heat exchanger 17 is omitted here.
- the cycle is particularly efficient.
- the cold for the precooler 10 and the oil condenser 9 is generated in at least one refrigerator 11.
- the device according to FIG. 3 essentially corresponds to the device shown in FIG. 1 and the device according to FIG. 4 essentially corresponds to the device shown in FIG. 2, with an adsorber 7 additionally between the liquid oil separator 6 and the heat exchanger 17 or the three-flow heat exchanger is arranged as a precooler 10.
- the vaporous oil components in the adsorber 7 are additionally adsorbed from the refrigerant.
- FIG. 5 An advantageous variant of the device is shown in FIG. 5.
- the coolant after the aftercooler 2 is only cooled in the oil condenser 9 and the oil separation in the liquid oil separator 6 is facilitated.
- Oil separation the oil vapors are adsorbed in an adsorber 7.
- the cleaned refrigerant enters the Joule-Thomson heat exchanger 3 and is then further treated in accordance with a Joule-Thomson process according to the prior art.
- the cold for the oil condenser 9 is generated by a refrigerator 11. 11
- the device shown in FIG. 6 has only one liquid oil separator 6 for separating the oil from the refrigerant mixture. No adsorber 7 is required in this device. The cold for the oil condenser 9 is generated in a refrigerator 11.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Lubricants (AREA)
- Compressor (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19820961 | 1998-05-12 | ||
DE1998120961 DE19820961A1 (de) | 1998-05-12 | 1998-05-12 | Verfahren und Vorrichtung zur Kälteerzeugung |
DE19821308 | 1998-05-13 | ||
DE19821308A DE19821308A1 (de) | 1998-05-13 | 1998-05-13 | Verfahren und Vorrichtung zur Kälteerzeugung |
PCT/EP1999/002932 WO1999058905A1 (de) | 1998-05-12 | 1999-04-30 | Verfahren und vorrichtung zur kälteerzeugung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1078208A1 true EP1078208A1 (de) | 2001-02-28 |
EP1078208B1 EP1078208B1 (de) | 2002-04-17 |
Family
ID=26046099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99924849A Expired - Lifetime EP1078208B1 (de) | 1998-05-12 | 1999-04-30 | Verfahren und vorrichtung zur kälteerzeugung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6463744B1 (de) |
EP (1) | EP1078208B1 (de) |
JP (1) | JP2002514734A (de) |
AT (1) | ATE216481T1 (de) |
DE (1) | DE59901262D1 (de) |
PE (1) | PE20000391A1 (de) |
WO (1) | WO1999058905A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100882074B1 (ko) * | 2000-05-30 | 2009-02-10 | 브룩스 오토메이션, 인크. | 저온 냉장시스템 |
US6923009B2 (en) * | 2003-07-03 | 2005-08-02 | Ge Medical Systems Global Technology, Llc | Pre-cooler for reducing cryogen consumption |
WO2005005569A1 (en) * | 2003-07-15 | 2005-01-20 | Indian Institute Of Technology | A refrigerant composition for refrigeration systems |
US7603871B2 (en) * | 2006-06-29 | 2009-10-20 | Test Enterprises, Inc. | High-flow cold air chiller |
DE102008052494A1 (de) * | 2008-09-30 | 2010-04-08 | Institut für Luft- und Kältetechnik gGmbH | Joule-Thomson-Kühler |
DE102009039814A1 (de) * | 2009-09-02 | 2011-03-10 | Airbus Operations Gmbh | System und Verfahren zum Kühlen mindestens einer Wärme erzeugenden Einrichtung in einem Flugzeug |
CN101893354B (zh) * | 2010-07-01 | 2012-10-17 | 大连三洋压缩机有限公司 | 一种过冷油冷器和新型经济器螺杆机制冷循环系统 |
JP5656691B2 (ja) * | 2011-03-04 | 2015-01-21 | 三菱電機株式会社 | 冷凍装置 |
EP2758728A4 (de) * | 2011-07-22 | 2015-02-18 | Lockheed Corp | Idca für schnellere abklingzeit und längere betriebszeit |
JP5575191B2 (ja) * | 2012-08-06 | 2014-08-20 | 三菱電機株式会社 | 二元冷凍装置 |
US9999885B1 (en) | 2014-05-30 | 2018-06-19 | Lockheed Martin Corporation | Integrated functional and fluidic circuits in Joule-Thompson microcoolers |
EP3162870A1 (de) | 2015-10-27 | 2017-05-03 | Linde Aktiengesellschaft | Bei niedriger temperatur gemischtes kühlmittel für wasserstoffvorkühlung in grossem umfang |
FR3133075B1 (fr) * | 2022-02-25 | 2024-02-23 | Absolut System | Système de refroidissement cryogénique |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0136342A4 (de) * | 1983-02-14 | 1985-07-01 | Gen Pneumatics Corp | Kryogenes kühlaggregat mit geschlossenem kreis. |
US4831828A (en) * | 1987-05-27 | 1989-05-23 | Helix Technology Corporation | Cryogenic refrigerator having a convection system to cool a hermetic compressor |
JPH0760027B2 (ja) * | 1988-03-25 | 1995-06-28 | 三洋電機株式会社 | 冷凍装置 |
US5337572A (en) * | 1993-05-04 | 1994-08-16 | Apd Cryogenics, Inc. | Cryogenic refrigerator with single stage compressor |
US5441658A (en) * | 1993-11-09 | 1995-08-15 | Apd Cryogenics, Inc. | Cryogenic mixed gas refrigerant for operation within temperature ranges of 80°K- 100°K |
US5617739A (en) * | 1995-03-29 | 1997-04-08 | Mmr Technologies, Inc. | Self-cleaning low-temperature refrigeration system |
US5595065A (en) * | 1995-07-07 | 1997-01-21 | Apd Cryogenics | Closed cycle cryogenic refrigeration system with automatic variable flow area throttling device |
DE19648902C2 (de) * | 1996-11-26 | 1998-09-10 | Univ Dresden Tech | Verfahren zur Realisierung eines Gemisch- Joule- Thomson-Prozesses und Vorrichtung zur Durchführung dieses Verfahrens |
DE19747985A1 (de) * | 1997-10-30 | 1999-05-27 | Univ Dresden Tech | Verfahren zur Realisierung eines Gemisch-Joule-Thomson-Prozesses und Vorrichtung zur Durchführung des Verfahrens |
-
1999
- 1999-04-30 DE DE59901262T patent/DE59901262D1/de not_active Expired - Lifetime
- 1999-04-30 EP EP99924849A patent/EP1078208B1/de not_active Expired - Lifetime
- 1999-04-30 WO PCT/EP1999/002932 patent/WO1999058905A1/de active IP Right Grant
- 1999-04-30 JP JP2000548667A patent/JP2002514734A/ja active Pending
- 1999-04-30 AT AT99924849T patent/ATE216481T1/de not_active IP Right Cessation
- 1999-04-30 US US09/674,948 patent/US6463744B1/en not_active Expired - Fee Related
- 1999-05-07 PE PE1999000375A patent/PE20000391A1/es not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9958905A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002514734A (ja) | 2002-05-21 |
PE20000391A1 (es) | 2000-05-24 |
ATE216481T1 (de) | 2002-05-15 |
US6463744B1 (en) | 2002-10-15 |
WO1999058905A1 (de) | 1999-11-18 |
DE59901262D1 (de) | 2002-05-23 |
EP1078208B1 (de) | 2002-04-17 |
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