US20070220910A1 - Refrigeration Installation and Method for Operating a Refrigeration Installation - Google Patents

Refrigeration Installation and Method for Operating a Refrigeration Installation Download PDF

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US20070220910A1
US20070220910A1 US10/589,091 US58909105A US2007220910A1 US 20070220910 A1 US20070220910 A1 US 20070220910A1 US 58909105 A US58909105 A US 58909105A US 2007220910 A1 US2007220910 A1 US 2007220910A1
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refrigeration
modified
consumer
expansion
refrigerant
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Uwe Schierhorn
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    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • 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
    • F25B41/00—Fluid-circulation 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0401—Refrigeration circuit bypassing means for the compressor
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/073—Linear compressors
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/14—Power generation using energy from the expansion of 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/22—Refrigeration systems for supermarkets
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements

Definitions

  • the invention relates to a refrigeration installation having at least one refrigeration consumer, which includes at least one evaporator, having at least one feed line and at least one discharge line, via which the refrigerant or refrigerant mixture is fed to the refrigeration consumer(s) and discharged from the refrigeration consumer(s), respectively, the evaporator(s) being assigned expansion members.
  • the invention relates to a method for operating a refrigeration installation in which the refrigeration compressor(s) is/are assigned modified expansion valves and modified linear compressors.
  • the invention relates to a method for operating a refrigeration installation, in which the conventional expansion valve(s) and the conventional compressor(s) of the refrigeration consumer(s) is/are assigned bypass lines.
  • modified expansion valves is to be understood as meaning all expansion valves which, in addition to the primary function of “expansion of a liquid”, have the secondary function of “realization of a fluid connection”.
  • modified compressor in the text which follows encompasses all compressors which, in addition to the primary function of “compression of a gas”, also allow the secondary function of “realization of a fluid connection”.
  • Refrigeration installations of the generic type are used for example in supermarkets or hypermarkets, where they generally supply a multiplicity of refrigeration consumers, such as cold stores, refrigerator cabinets and/or freezer cabinets. For this purpose, a one-component or multicomponent refrigerant or refrigerant mixture circulates inside them.
  • the liquid refrigerant (mixture) from the liquefier is fed to a collection vessel that is optionally to be provided.
  • a collection vessel that is optionally to be provided.
  • refrigerant there must always be enough refrigerant to ensure that the evaporators of all the refrigeration consumers can be filled even during the maximum demand for refrigeration.
  • the excess refrigerant (mixture) since when the demand for refrigeration is lower some evaporators are only partially filled or are even completely empty, the excess refrigerant (mixture), during these times, has to be collected in the collection vessel provided for this purpose.
  • the refrigerant (mixture) is fed from the collection vessel to the refrigeration consumers via at least one liquid line.
  • An expansion device preferably an expansion valve, in which the refrigerant (mixture) flowing into the refrigeration consumer or the evaporator(s) of the refrigeration consumer is expanded, is connected upstream of each refrigeration consumer.
  • the refrigerant (mixture) which has been expanded in this way is evaporated in the evaporators of the refrigerant consumers and thereby cools the corresponding refrigeration cabinets or cold stores.
  • the evaporated refrigerant (mixture) is then fed via a suction line to a compressor unit.
  • These compressor units may be of single-stage or multistage design.
  • the individual compressor stages generally have a plurality of compressors connected in parallel, which compress the refrigerant (mixture) and pass it back, via a riser, to the liquefier which has already been mentioned.
  • the compressor unit is normally positioned, for example, in a machine room arranged in the basement of a supermarket, the liquefier is located on the roof of the supermarket.
  • the compressors used are generally oil-lubricated reciprocating piston compressors which are driven in rotation.
  • One drawback in this case is that corresponding measures have to be taken to allow the oil released from the reciprocating piston compressor to be separated from the refrigerant (mixture).
  • it is generally necessary to ensure that the oil which has been separated off is fed back to the reciprocating piston compressor(s).
  • the mixture of refrigerant and oil first of all has to be passed to specific points within the cycle, and consequently minimum velocities have to be reached in rising suction and pressure lines, since the oil would not otherwise be entrained.
  • These minimum velocities mean small pipe diameters, resulting in additional, undesired pressure losses and therefore energy losses.
  • the system of a cold vapor refrigeration installation in which a distinction is drawn between subcritical (with reliquefaction) and supercritical (with gas recooling) operation, so that a “gas cooler” is used instead of the “liquefier” component, it is also possible for a gaseous refrigerant (mixture) to circulate in a refrigeration installation, which under the given boundary conditions (pressure, temperature, etc.) is not in liquid form at any time.
  • cold gas refrigeration installation also referred to as a Joule, Stirling or Gifford-McMahon installation.
  • liquefier If the process in question is a cold vapor compression process in the two-phase range, it is actually a liquefier that is used. In the case of a supercritical procedure or gas processes, the term “liquefier” in turn stands for a gas cooler. It is essential for heat to be dissipated from the cycle process.
  • the liquefaction can take place in an air-cooled apparatus, in an intermediate-pressure separator or alternatively by means of a further assembly connected in a cascade. A cascade connection is present whenever there is a further refrigeration machine which is operated at a higher temperature level and which alone dissipates the heat of liquefaction to the environment.
  • the refrigeration set is in this case dependent on this refrigeration machine and in turn transfers its heat of liquefaction thereto.
  • a standard cooling set it is possible for a standard cooling set to be connected upstream of a freezing set, in which case the two cooling sets may have different refrigerants or refrigerant mixtures.
  • the refrigeration installation or the evaporators arranged in the refrigeration consumers have to be defrosted at regular intervals, since frosting or icing of the evaporators leads to a reduction in the efficiency of the evaporators.
  • One defrosting option is electrical defrosting, in which the evaporators are defrosted by means of electrical heaters arranged in and/or on them. However, this procedure leads to an undesirable increase in the consumption of electrical energy.
  • compressed gas defrosting is a recommended alternative to the electrical defrosting described above.
  • compressed-gas lines are laid between the gas space of the collection vessel connected downstream of the liquefier and each evaporator or evaporator module, and refrigerant, which is preferably at a temperature of between 35 and 45° C., is fed from the collection vessel to the evaporators or evaporator modules via these compressed-gas lines.
  • refrigerant which is preferably at a temperature of between 35 and 45° C.
  • the invention proposes a refrigeration installation which is distinguished by the fact that
  • linear compressors operate as oil-free cryogenic Stirling coolers at extremely low temperatures and extremely low powers, i.e. in cold-vapor compression.
  • cold-vapor compression linear compressors have only been implemented for a few years and have hitherto not been deployed extensively.
  • the applicant is only aware of one application, namely the use of a linear compressor in a domestic refrigerator.
  • a drawback of linear compressors is that their production costs have hitherto been well above those of reciprocating-piston compressors driven in rotation, but of a similar order of magnitude to inverter compressors. Only in the 1960s were efforts made to exploit the advantages of linear compressors. The principle of friction-free mounting of the piston only dates from this time.
  • Linear compressors have the advantage of allowing continuously variable power control, which is realized by reciprocating control. Furthermore, they can be operated without oil. Furthermore, the condensate which is inevitably formed during defrosting operation does not cause any damage to them. Furthermore, they are superior in energy terms to oil-lubricating reciprocating piston compressors which are driven in rotation.
  • Linear compressors also have the advantage of not being damaged by the pumping of liquid, unlike other designs of compressor.
  • the pumping of liquid is of relevance in particular after the end of a defrosting process, since at this time under certain circumstances condensate may still be present in the defrosted evaporators, and this condensate is sucked in by the compressor when it starts to operate again.
  • a design solution in which a disk valve as pressure valve replaces the cylinder head has also already been proposed; this leads to very high operational reliability.
  • each consumer can be controlled individually and, moreover, continuously by means of its own compressor. Unlike in the known procedures or refrigeration installations, this individual control can now take place irrespective of the temperature level in the return line, since the return or discharge line now no longer represents the suction line, the pressure of which is dependent on the evaporation temperature, which predetermines the temperature of the refrigeration consumers, but rather represents the pressure line.
  • freezer cabinets it is possible, for example, for freezer cabinets to be temporarily used and operated as standard refrigerator cabinets and/or display shelves for fresh meat and at times for dairy products.
  • this changeover is effected by adjusting a temperature selection button on the refrigeration cabinet in question.
  • a pressure line has a smaller diameter compared to the corresponding suction line and moreover does not require any insulation.
  • the invention also relates to two alternative methods for operating a refrigeration installation of the generic type in order to realize a compressed-gas defrosting method.
  • the first alternative of the method according to the invention for operating a refrigeration installation is distinguished by the fact that during the defrosting phase of the refrigeration consumer or at least one of the refrigeration consumers, the modified expansion valve(s) and the modified linear compressor(s) of the refrigeration consumer(s) which is/are to be defrosted is/are moved into the working position in which through-flow without a significant pressure drop is possible.
  • the second alternative of the method according to the invention for operating a refrigeration installation is characterized in that during the defrosting phase of the refrigeration consumer or at least one of the refrigeration consumers, the associated bypass lines are opened and the associated conventional expansion valve(s) and the associated conventional compressor(s) are taken out of operation.
  • FIG. 1 shows a refrigeration installation
  • FIG. 2 shows an alternative embodiment of a refrigeration installation
  • FIG. 3 shows another embodiment of a refrigeration installation.
  • FIG. 1 shows a refrigeration installation according to the invention, which is used to supply three refrigeration consumers V′, V′′ and V′′′. Of course, there may be any desired number of refrigeration consumers.
  • the refrigerant or refrigerant mixture referred to below simply as “refrigerant”—is fed to the above-mentioned refrigeration consumers via a (central) feed line 1 and lines 1 ′, 1 ′′ and 1 ′′′ which branch off from this feed line 1 .
  • either a modified expansion valve a, b or c is connected upstream of the evaporator of each refrigeration consumer V′, V′′ and V′′′ or
  • FIG. 2 shows, on the basis of the refrigeration consumer V′, by way of example, an alternative configuration of the refrigeration installation according to the invention to the embodiment illustrated in FIG. 1 .
  • modified expansion valves a, b and c illustrated in FIG. 1 it is also possible to use modified linear expansion machines.
  • the expanded refrigerant is fed via the lines 2 ′, 2 ′′ and 2 ′′′ to the evaporators of the refrigeration consumers V′, V′′ and V′′′, in which it is evaporated.
  • the evaporated refrigerant is then fed back to the (central) return line 3 via the return lines 3 ′, 3 ′′ and 3 ′′′ by means of the modified linear compressors x, y and z.
  • the modified linear compressors x, y and z illustrated in FIG. 1 it is also possible to provide a conventional compressor x′ which has a bypass line 5 , illustrated by dashed lines; this embodiment of the refrigeration installation according to the invention is also illustrated in FIG. 2 .
  • the modified linear compressor x and the modified expansion valve a are moved into the working position in which flow through the modified linear compressor x and the modified expansion valve a is possible without a significant pressure loss in the refrigerant.
  • the warm refrigerant now passes out of the refrigeration consumers V′′ and/or V′′′, via the line 3 ′, through the opened, modified linear compressor x to the evaporator of the refrigeration consumer V′ and defrosts the latter.
  • the refrigerant which has been cooled and possibly condensed as a result of the defrosting process is fed back to the (central) feed line 1 via the line 2 ′, the opened modified expansion valve a and the line 1 ′, and then passes back to the refrigeration consumers V′′ and V′′′ via the lines 1 ′′ and 1 ′′′.
  • the refrigeration consumers V′, V′′ and/or V′′′ can—as illustrated in FIG. 1 —be connected to the feed line 1 and the discharge line 3 by means of couplings, preferably by means of quick-acting couplings K, in particular by means of standardized quick-acting couplings.
  • the refrigeration consumers V′, V′′, V′′′, . . . may also—as illustrated in FIG. 2 —be connected to one another in segments and directly, including the main lines 1 and 3 .
  • FIG. 2 it should be ensured that under certain circumstances consumers or liquefiers at a different level—i.e. for example cold stores which are arranged on different floors of a hypermarket—are connected to one another, although in this case direct coupling or connection is not possible.
  • Both methods according to the invention for operating a refrigeration installation now make it possible for one or more refrigeration consumers that are to be defrosted simultaneously to be defrosted by the other refrigeration consumer(s) which are in the cooling phase. This is done without the need for additional pipe networks and/or additional energy sources, as were required hitherto for compressed-gas defrosting.
  • FIG. 3 shows by way of example with reference to refrigeration consumer V′ the above-mentioned configuration of the refrigeration installation according to the invention.
  • the refrigeration consumer V′, V′′ or V′′′ as a dedicated refrigerant (mixture) cycle 6 , 7 , 8 and 9 , which is operatively connected via the liquefier E to the feed line 1 and the discharge line 3 .
  • the refrigerant (mixture) cycle 6 , 7 , 8 and 9 has either a modified expansion valve a and a modified linear compressor x or a modified linear expansion machine, or else the conventional valve and/or the conventional expansion machine and the conventional compressor are assigned bypass lines, which are indicated by dashed lines in FIG. 3 .
  • This configuration allows the flexibility of the refrigeration installation according to the invention to be increased significantly compared to refrigeration installations of the generic type, since this configuration of the refrigeration installation according to the invention allows the (retrospective) inclusion of further refrigeration consumers in the refrigeration installation assembly.
  • the linear compressors that are to be provided are operated without oil. Therefore, the refrigeration installation according to the invention eliminates all the measures which have hitherto been required to separate off, recirculate, distribute and store the oil. Since transporting and distributing the oil within the pipe network is no longer of relevance, the individual lines or line sections can now be dimensioned exclusively on the basis of economic criteria.
  • the invention means that it is now no longer necessary to install what are known as combined refrigeration sets. Rather—at least in a relatively large area—it is possible for a large number of individual and if appropriate different refrigeration consumers to be linked into or removed from an existing system comprising liquid line, gas or pressure line and liquefier, if appropriate retrospectively. This is made possible in particular by virtue of the fact that it is possible to dispense with the above-described compressor sets of the combined refrigeration installations that have hitherto been required, since each refrigeration consumer now has its own compressor, which is adapted to the prevailing boundary conditions and specifics of the refrigeration consumer.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Pipeline Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Defrosting Systems (AREA)
US10/589,091 2004-02-09 2005-02-03 Refrigeration Installation and Method for Operating a Refrigeration Installation Abandoned US20070220910A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004006271A DE102004006271A1 (de) 2004-02-09 2004-02-09 Kälteanlage und Verfahren zum Betreiben einer Kälteanlage
DE102004006271.4 2004-02-09
PCT/EP2005/001092 WO2005075901A1 (de) 2004-02-09 2005-02-03 Kälteanlage und verfahren zum betreiben einer kälteanlage

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EP (1) EP1714094A1 (de)
DE (1) DE102004006271A1 (de)
WO (1) WO2005075901A1 (de)

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DE102011000690A1 (de) * 2011-02-14 2012-08-16 Kmw Kühlmöbelwerk Limburg Gmbh Kühlmöbel für ein zentrales Kälteversorgungssystem

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WO2005075901A1 (de) 2005-08-18
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