DE102008055959A1 - Fridge and / or freezer - Google Patents

Fridge and / or freezer

Info

Publication number
DE102008055959A1
DE102008055959A1 DE200810055959 DE102008055959A DE102008055959A1 DE 102008055959 A1 DE102008055959 A1 DE 102008055959A1 DE 200810055959 DE200810055959 DE 200810055959 DE 102008055959 A DE102008055959 A DE 102008055959A DE 102008055959 A1 DE102008055959 A1 DE 102008055959A1
Authority
DE
Germany
Prior art keywords
heat exchanger
cooling
warm
cold
characterized
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.)
Withdrawn
Application number
DE200810055959
Other languages
German (de)
Inventor
Dietmar Dipl.-Ing. Blersch
Thomas Dipl.-Ing. Ertel
Thomas Dipl.-Ing. Gindele
Holger Dipl.-Ing. Jendrusch
Eugen Dipl.-Ing. Schmid
Didier Dipl.-Ing. Siegel
Matthias Wiest
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Hausgeraete Ochsenhausen GmbH
Original Assignee
Liebherr Hausgeraete Ochsenhausen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE202008011494.2 priority Critical
Priority to DE202008011493 priority
Priority to DE202008011493.4 priority
Priority to DE202008011494 priority
Application filed by Liebherr Hausgeraete Ochsenhausen GmbH filed Critical Liebherr Hausgeraete Ochsenhausen GmbH
Priority to DE200810055959 priority patent/DE102008055959A1/en
Publication of DE102008055959A1 publication Critical patent/DE102008055959A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06Removing frost
    • F25D21/12Removing frost by hot-fluid circulating system separate from the refrigerant system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B9/00Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F25B9/145Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS
    • F25D11/00Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures

Abstract

The invention relates to a refrigerator and / or freezer with a thermoacoustic cooler, with a cold heat exchanger for cooling the refrigerator and / or freezer compartment of the device and with control means, wherein the control means are designed such that in the cooling mode of the device in the thermoacoustic cooler cooled heat transfer medium is fed to the cold heat exchanger.

Description

  • The Invention relates to a cooling and / or freezer with a thermoacoustic cooler, with a cold heat exchanger for cooling the cooling and / or Freezer compartment of the device and with control means, wherein the control means are designed such that in the cooling mode of the device that in the thermoacoustic cooler chilled Heat transfer medium the cold heat exchanger is supplied.
  • at the thermoacoustic cooling the effect is used that acoustic waves (sound waves) inhomogeneous Can produce temperature distributions at limiting contact surfaces. To the Example becomes by a resonator (eg loudspeaker) the working medium (eg helium) to monochromatic vibrations of high intensity. The working fluid is absorbed by the longitudinal waves in one so-called stack back and forth. This stack is preferably Made of a material with high heat capacity and lower Thermal conductivity. Due to the longitudinal vibration is now by compression and Expansion of the working medium this locally heated and cooled. in the Simplified model will be many adjacent gas packages considered that in their cooperation the one heat exchanger (cold reservoir) heat and in each case by one oscillation amplitude per gas package along the Stacks to the other heat exchanger (warm reservoir) transport. It is with this process possible, Heat from a heat exchanger to transfer another and thus a chiller drive.
  • One conceivable refrigeration cycle includes a cold heat exchanger, the thermoacoustic cooler, a warm heat exchanger and a pump for delivery the heat transfer medium. During the Resonator of the thermoacoustic cooler is running, which is due to the thermoacoustic cooler flowing Heat transfer medium heated in a heat exchanger and then by means of said pump in the warm heat exchanger guided, in which it cooled becomes. The warm heat exchanger corresponds while in its function the condenser of a well-known Cooling circuit with compressor, condenser and evaporator. Meanwhile is in the second heat exchanger in the thermoacoustic cooler the heat transfer medium chilled and flows through subsequently the cold heat exchanger, usually in the cooling or the freezer compartment or in its area and for recording of heat serves from this room.
  • During the Operation, it may happen that the cold heat exchanger, in or in the area of the cooling and / or freezer compartment is arranged, iced, so the need exists to defrost this. The defrosting is usually done when switched off Pump and with switched off thermoacoustic cooler and until a certain Temperature value reached or exceeded is. Subsequently becomes the cooling circuit as described above again put into operation and there is a cooling of the cooling or freezer compartment by means of the flowed through by the cold heat transfer medium cold Heat exchanger.
  • Of the present invention is based on the object, a cooling and / or freezer of the type mentioned in an advantageous manner, in particular, in that the defrost duration is reduced.
  • These The object is achieved by a Cooling and / or freezer solved with the features of claim 1. After that it is envisaged that a refrigerator and / or freezer a thermoacoustic cooler, at least one cold heat exchanger for cooling of the cooling and / or freezer compartment of the refrigerator and / or freezer and control means, wherein the control means are designed such that in the cooling mode the cooling and / or freezer that in the thermoacoustic cooler chilled Heat transfer medium the at least one cold heat exchanger is supplied. Furthermore, the control means are designed such that in the defrost mode of the cooling and / or freezer the thermoacoustic cooler is switched off and / or that heated in the thermoacoustic cooler heat transfer medium the at least one cold heat exchanger is supplied. Notwithstanding the cooling operation, in the cold heat exchanger that in the thermoacoustic cooler chilled Heat transfer medium supplied is now provided in the defrost mode, that in the thermoacoustic cooler heated heat transfer medium is fed to the cold heat exchanger, whereby its temperature increases faster and the defrost time accordingly is reduced. It is also conceivable, when continuing to run the heat transfer medium pump the thermoacoustic cooler in the defrost mode of the device off. A change a possible valve circuit is not required.
  • It It is conceivable that the control means in the flow direction of the heat transfer medium upstream of the thermoacoustic cooler and upstream the at least one cold heat exchanger at least a valve and a valve control include. At the valves For example, they can be bistable or monostable valves act.
  • It may be provided that the refrigerator and / or freezer was also at least one having heat exchanger and that one of the valves between the hot heat exchanger and the thermo-acoustic cooler is arranged.
  • Furthermore Is it possible, in that the control means are furthermore designed such that in the defrost mode of the cooling and / or freezer by means of at least one pump warm heat transfer medium from the warm heat exchanger to the at least one cold heat exchanger promoted becomes. This advantageous embodiment is thus the idea At the bottom, warm heat transfer medium from the warm heat exchanger directly or indirectly to promote the cold heat exchanger to the defrosting process of the cold heat exchanger to accelerate. This promotion For example, by means of a during defrosting at least temporarily operated pump in which it is is preferably the said pump of the cooling circuit, the in cooling mode the promotion the heat transfer medium performs.
  • Conceivable it is that the control means are designed such that at least one Pump during promotes the entire duration, in which the cooling and / or freezer in the defrost mode or even during one or more time periods while the defrosting phase. The phase while that is in the defrost mode, can with the term defrosting be designated.
  • In A further embodiment of the invention provides that the control means carried out in such a way are that the pump at least in the initial phase of defrosting promotes. In this period is located in the warm heat exchanger heat transfer medium comparatively warm and is therefore particularly suitable to the defrost time of the cold heat exchanger to reduce.
  • During the End phase of the defrosting phase, it may happen that in the warm heat exchanger located heat transfer medium largely chilled and therefore has only a comparatively low temperature, so that in this case may be provided to turn off the pump or this only slightly heated heat transfer medium not in the cold heat exchanger to promote.
  • however it is alternative or in addition possible, that the control means are designed such that the pump at least promotes in the final stages of defrosting. In this phase, the temperature gradient between the cold heat exchanger and the surrounding air comparatively small, so it just then makes sense, the defrosting by the supply of warm heat transfer medium from the warm heat exchanger to promote.
  • Further Is it possible, in that the control means are designed such that at least one Pump does not promote at the beginning and / or not at the end of the defrosting phase.
  • Conceivable is to provide a temperature sensor, which the temperature of the warm heat exchanger or the heat transfer medium flowing through the warm heat exchanger recorded directly or indirectly. The Z. B. executed as a control unit control means may be carried out in this case, that they the pump dependent on of which operates the temperature of the warm heat exchanger or in this located or flowing through this Heat transfer medium having. It is conceivable, for example, the promotion of the warm heat transfer medium from the warm to the cold heat exchanger only as long as that in the warm heat exchanger located Heat transfer medium a certain temperature does not fall below.
  • In A further embodiment of the invention provides that the control means carried out in such a way are that the heat transfer medium from the warm heat exchanger over the / the when switching from the cooling mode on the defrost mode warm unit / area of the thermoacoustic chiller too the at least one cold heat exchanger is performed. The thermoacoustic cooler has in this embodiment of the invention a cold and a warm area or a cold and a warm unit that is up alternately in the cold or warm state. In this Embodiment of the invention is now provided that the flow of the from the warm heat exchanger flowing heat carrier the last warm area or the last warm unit of the ther moakustischen cooler and from there to the thawed cold heat exchanger takes place to a highest possible Temperature of the warm heat transfer medium upright to obtain.
  • Preferably is upstream and downstream the at least one cold heat exchanger each arranged at least one valve. This results in the Advantage over these valves additional Lines z. B. for feeding from additional Heat transfer medium to join.
  • In addition, it is conceivable that connected to the thermoacoustic cooler, a cold partial circuit and a warm partial circuit is formed, wherein the cold partial circuit has at least one pump, a valve and at least one cold heat exchanger and wherein the warm partial circuit at least one pump and at least one hot heat exchanger having. It is the cold Partial circuit provided to dissipate heat from the interior of the refrigerator and / or freezer. The warm circuit is used to give heat to the environment. The thermoacoustic cooler sits between the cold and the warm circuit.
  • Further It is conceivable that the cold part cycle at least two cold heat exchangers and a subcircuit located at an upstream of the cold heat exchanger arranged valve is connected and has a cold heat exchanger.
  • Preferably this subcirculation is the cooling part of the cooling and / or freezer assigned and withdraws with the therein cold heat exchanger the cooling part of the cooling and / or freezer Warmth. By means of the upstream arranged valve, the sub-circuit associated with the cooling part is to be decoupled, so that the rest of the subcircuit continues can be operated cold. The rest Partial circulation can advantageously the freezer compartment or a freezer compartment of the refrigerator and / or freezer be assigned.
  • It can also be provided that bypass lines to bypass of the thermoacoustic cooler are provided, wherein a first bypass line at the downstream of the cold heat exchanger arranged valve is connected and the cold subcircuit connects to the warm part circuit and wherein a second bypass line is provided, which is connected to a valve in the warm subcircuit is and connects the warm part circuit with the cold part cycle. So can advantageously with appropriate valve position of the thermoacoustic Be bypassed cooler so that warm heat transfer medium from the warm part cycle over the bypass lines can be pumped into the cold subcircuit, preferably by means of the pump located in the warm part cycle. at the same time becomes the cold heat transfer medium pumped from the cold part cycle into the warm part cycle and warmed up there. As a result, the defrosting process can be significantly accelerated.
  • Prefers it will if the second bypass line is the warm subcircuit connects to the subcirculation of the cold subcircuit.
  • It can further be provided that the control means so accomplished are that switching from the cooling mode to the defrost mode by a time offset in the control of the valves or by a temporal offset of the operation of the thermoacoustic cooler or by a reversal of the conveying direction the heat transfer medium he follows.
  • Conceivable Thus, it is when switching from the cooling mode to the defrost mode or even when switching from the defrost mode to the cooling mode the thermoacoustic cooler continue to operate unchanged and the flow guidance of the heat transfer medium only to change by a timing offset of the valve control. there the pump that operates the cold cycle must be switched off be.
  • Further It is conceivable that the valves are designed as 3-way valves and / or solenoid valves accomplished are.
  • Conceivable is further that the thermoacoustic cooler two or more than two heat exchanger units includes that carried out so are that in these cyclically heating or cooling of the these flowing through Heat transfer medium takes place.
  • It is preferred when the heat exchanger units of the thermoacoustic cooler consist of a material with a high thermal conductivity or such Have material.
  • Of Furthermore, it is conceivable that the thermoacoustic cooler a Sound wave delivery means, one associated with the warm subcircuit Heat exchanger unit, a stack and a heat exchanger unit associated with the cold subcircuit having. Particularly preferred in this context, if the sound waves emitted by the sound wave output means directly directed to the warm circuit associated heat exchanger unit are.
  • It is also conceivable that the sound wave output means of the thermoacoustic cooler a loudspeaker or resonator.
  • It is also possible that on the thermoacoustic cooler adjacent frequency and / or amplitude can be modulated and / or reversed, such that the heat exchanger unit associated with the cold subcircuit heatable and / or the heat exchanger unit associated with the warm partial circuit be cooled is. Thus, to reduce the cooling time advantageously the frequency and / or amplitude of the thermoacoustic cooler such be adapted to the cold heat exchanger unit in the thermoacoustic cooler gets warm and accordingly the warm heat exchanger unit cold. hereby There is the advantage that during the operation of the thermoacoustic cooler warm or heated heat transfer medium in the cold heat exchanger reach and reduce the defrost time significantly.
  • Furthermore, it is conceivable that at least one fan is provided, which is the at least one cold heat exchanger supplies warm air from the refrigerator and / or freezer compartment of the refrigerator and / or freezer. This form of forced convection can be used to dry any adhering moisture. Furthermore, improved heat transfer from the cooling and / or freezing space to the corresponding heat exchanger (s) can be achieved.
  • Further Details and advantages of the invention will now be described with reference to a In the drawing illustrated embodiment will be explained in more detail. Show it:
  • 1 a schematic drawing of a cycle with thermoacoustic cooler;
  • 2 a schematic drawing of a cooling circuit with thermo-acoustic cooler in a further embodiment;
  • 3 a schematic drawing of a cooling circuit with thermo-acoustic cooler in a further embodiment;
  • 4 a schematic drawing of a cooling circuit with thermo-acoustic cooler in a further embodiment;
  • 5 : a schematic representation of a thermoacoustic cooler.
  • 1 shows an embodiment of a cooling circuit according to the invention for a refrigerator and / or freezer with a thermo-acoustic cooler 10 , The thermoacoustic cooler is located between a cold partial circuit 20 and a warm circuit 30 , each on one side of the thermoacoustic cooler 10 are connected. The partial cycle 20 has a pump 21 on, the downstream of the thermoacoustic cooler 10 in the cold part cycle 20 is arranged.
  • Downstream of the pump 21 There is a designed as a 3-way valve valve 22 of which with the line 27 starting a cold subcircuit 26 branches. The cold subcircuit 26 has a cold heat exchanger 23 on, which is associated with the cooling part of a refrigerator and / or freezer. Downstream of the cold heat exchanger 23 and downstream of the valve 22 there is another cold heat exchanger 24 , which is assigned in the embodiment shown here the freezer compartment of a refrigerator and / freezer. It is possible, with appropriate switching of the valve 22 the cold heat exchanger 23 and 24 to supply parallel with heat transfer medium or heat transfer medium in the heat exchanger 23 and 24 inject. By the series connection of the cold heat exchanger 23 with the cold heat exchanger 24 where the cold heat exchanger 23 on the outlet side with the inlet of the cold heat exchanger 24 is connected, prevents it to displacements of the heat transfer medium.
  • Downstream of the cold heat exchanger 24 there is another 3-way valve 25 , from a spout 25 '' leading back to the thermoacoustic cooler and from its further outlet or valve outlet 25 ' a bypass line 40 branches off to the line 34 the warm part cycle 30 leads. Here is the line 34 a return line 34 , the heat transfer medium from the warm heat cycle 30 back to the thermoacoustic cooler 10 leads. The warm part cycle 30 is doing by a pump 31 operated, the heat transfer medium coming from the thermoacoustic cooler in the warm heat exchanger 32 into pumps. The warm heat exchanger 32 is z. B. air cooled and arranged on the outside of the device and is used for heat removal from the heat transfer medium into the environment. Downstream of the warm heat exchanger 32 there is another 3-way valve 33 , which also has two spouts 33 ' . 33 '' having. This is the outlet 33 ' with another bypass line 42 connected, by means of which warm heat transfer medium to the line 27 of cold skating 26 can be supplied. In working mode, however, the valve outlet 33 ' locked, leaving the warm heat exchanger 32 coming heat transfer medium over the line 34 again the thermoacoustic cooler 10 is supplied.
  • Through the bypass lines 40 . 42 it becomes possible that the thermoacoustic cooler 10 during the defrosting phase can be on or off.
  • For the defrosting process It is now conceivable that there will be a "reversal of the conveying direction".
  • Under the concept of "reversal the conveying direction "is closed understand that the heat transfer medium the system in to cooling mode flows through the reverse direction. This can be done by reversing the pumping direction of the pump or be achieved in that the conveying direction of the pump remains unchanged and the conveying direction the heat transfer medium by a changed Line connection is made.
  • In the case where the valve outputs 25 ' and 33 ' the valves 25 and 33 while the remaining valve outputs are open 25 '' . 33 '' closed, it is possible the cold part cycle 20 bypassing the thermoacoustic cooler 10 easy to defrost. For this purpose, the pump 31 used, by means of which warm cooling medium from the warm part cycle 30 over the line 42 to the cold part cycle 20 is guided, there by the cold heat exchanger 23 and 24 is flowing and this one here through defrosts. The cycle is then used for defrosting through the bypass line 40 closed, by means of which the cooling medium back to the warm part cycle 30 and over the line 34 the pump 31 is fed again.
  • The pump 21 in the cold part cycle can be turned off advantageously here.
  • 2 shows essentially a comparable circuit construction of a cooling circuit of a refrigerator and / or freezer, as in 1 is shown. However, there are no bypass lines, by means of which the thermoacoustic cooler can be hidden or bypassed. The same or comparable components are provided with the same reference numerals.
  • For the defrosting process in this embodiment, only the thermoacoustic cooler 10 turned off, leaving the pumps 21 . 31 thus warm heat transfer medium in the cold part cycle 20 Inward conveyance. It can also be provided that the pump 21 not operated. In the case in which, for example, the device is recognized that the subcircuit 26 located cold heat exchanger 23 no defrost needed, can by appropriately locking the valve 22 be achieved that the warm heat transfer medium coming from the warm part cycle 30 only the cold heat exchanger 24 flows through.
  • 3 shows a schematic representation of another embodiment of a cooling circuit with a thermo-acoustic cooler 10 , Here is the cold part cycle 20 with a pump 21 and two serially connected cold heat exchangers 23 . 24 executed. In this case, the first cold heat exchanger 24 the freezer compartment and the second cold heat exchanger 23 be assigned to the cooling part of the refrigerator and / or freezer. The warm part cycle 30 is comparable to the one in 2 illustrated embodiment and has an air-cooled, attached to the outside of the refrigerator and / or freezer warm heat exchanger 32 on.
  • Furthermore 4 shows a further embodiment of a cooling circuit with a thermo-acoustic cooler 10 , Here is the cold part cycle 20 with a big, cold heat exchanger 24 executed. By means of a fan 50 warm air is supplied from the refrigerator and / or freezer compartment of the refrigerator and / or freezer. This forced convection can be used to dry any adhering moisture. Furthermore, an improved heat transfer from the cooling and / or freezing space to the corresponding heat exchanger (s) is achieved. The heat absorption through the cold heat exchanger 24 This is essentially done by the fan 50 supplied air, as is already known in comparable form from so-called NoFrost devices.
  • 5 shows the schematic structure of a thermo-acoustic cooler 10 , the two heat exchanger units 14 . 18 includes, which may be designed as a structural unit or separated from each other. These heat exchanger units be made of a material with high thermal conductivity or have such a material. Through the resonator 12 generated sound waves are the gas molecules in the stack 16 heats and transports heat from the cold heat exchanger 18 on the warm heat exchanger 14 , Accordingly, the heat transfer medium is passed through the heated heat exchanger unit, a heating and the heat transfer medium, which is passed through the cooled heat exchanger unit, a cooling.
  • In the 1 - 4 embodiments shown can be operated in the defrost mode as follows:
    Basically, at all in 1 - 4 one or more temperature sensor (s) for detecting the temperature of the cold heat exchanger shown embodiments 23 . 24 be provided. Depending on the detected temperature, the defrost mode can be started. Of course, it is possible that the detected temperature of the cold heat exchanger 23 . 24 is a parameter of several parameters that are used as a decision criterion for triggering the defrost mode. In particular, at all in 1 - 4 shown embodiments may be provided that the thermoacoustic cooler 10 is switched off during the defrost mode. The off and on can automatically z. B. be made by the device control.
  • By the control means, the in 1 shown circuit operated so that at least the pump 31 during the entire time period or defrosting phase promotes or that only during a period of time which is shorter than the defrosting phase, heat transfer medium through the pump 31 is encouraged. In particular, it can, for. B. as a function of the detected by not further shown sensors temperature of the cold heat exchanger 23 . 24 the pump 31 in change to the pump 22 operate. Alternatively, it can also be provided that the pump 31 in batches, ie periodically with a predetermined period of time or adjusted according to the detected temperature to the cold heat exchanger 23 . 24 promotes. It is also and / or additionally possible for a pump 21 . 31 promotes at the beginning and / or end of the defrosting phase. Just as well, it can be provided that the pump 21 . 31 not at the beginning and not at the end of the defrosting phase, but only in an intervening period during the defrosting phase.
  • The bypass lines 40 . 42 are unlocked while the thermoacoustic cooler 10 is hidden. This is done by a corresponding position of the valves 22 . 25 . 33 achieved, in particular the valve outputs 25 ' . 33 ' are open.
  • At the in 2 - 4 shown embodiments may be provided that by means of the control means, the circuits is switched such that the heat transfer medium from the warm heat exchanger 32 over the warm heat exchanger unit 14 of the thermoacoustic cooler 10 to the cold heat exchangers 23 . 24 is directed. This is also the case in the 1 shown embodiment in principle possible, for which purpose the valves 22 . 25 . 33 each with all valve outputs are open and no line lock.
  • Furthermore, alternatively or additionally, the thermoacoustic cooler 10 adjacent frequency and / or amplitude are modulated and / or reversed, so that the cold part cycle 20 associated heat exchanger unit 18 heated and / or the warm part cycle 30 associated heat exchanger unit 14 is coolable. Thus, to reduce the cooling time advantageously the frequency and / or amplitude of the thermoacoustic cooler 10 be adapted so that the cold heat exchanger unit 18 in thermoacoustic cooler 10 gets warm and, accordingly, the warm heat exchanger unit 14 cold. This has the advantage that during operation of the thermoacoustic cooler 10 warm or heated heat transfer medium in the or the cold heat exchanger 23 . 24 reach and reduce the defrost time significantly.

Claims (23)

  1. Refrigerator and / or freezer with a thermoacoustic cooler ( 10 ), with at least one cold heat exchanger ( 23 . 24 ) for cooling the refrigerator and / or freezer compartment of the refrigerator and / or freezer and with control means, wherein the control means are designed such that in the cooling mode of the refrigerator and / or freezer in the thermo-acoustic cooler ( 10 ) cooled heat transfer medium the at least one cold heat exchanger ( 23 . 24 ), wherein the control means are further designed such that in the defrost mode of the refrigerator and / or freezer the thermoacoustic cooler ( 10 ) and / or that in the thermoacoustic cooler ( 10 ) heated heat transfer medium the at least one cold heat exchanger ( 23 . 24 ) is supplied.
  2. Cooling and / or freezing appliance according to claim 1, characterized in that the control means in the flow direction of the heat transfer medium upstream of the thermoacoustic cooler ( 10 ) and upstream of the at least one cold heat exchanger ( 23 . 24 ) at least one valve ( 22 . 25 . 33 ) and a valve control include.
  3. Cooling and / or freezing appliance according to claim 2, characterized in that the refrigerator and / or freezer further comprises a warm heat exchanger ( 32 ) and that one of the valves ( 33 ) between the warm heat exchanger ( 32 ) and the thermoacoustic cooler ( 10 ) is arranged.
  4. Cooling and / or freezing appliance according to claim 3, characterized in that the control means are further designed such that in the defrost mode of the refrigerator and / or freezer by means of at least one pump ( 21 . 31 ) warm heat transfer medium from the warm heat exchanger ( 32 ) to the at least one cold heat exchanger ( 23 . 24 ).
  5. Cooling and / or freezing appliance according to claim 4, characterized in that the control means are designed such that at least one pump ( 21 . 31 ) during the entire period (defrosting phase) in which the device is in the defrosting mode or during a period of time shorter than the defrosting phase.
  6. Cooling and / or freezing appliance according to one of claims 4 or 5, characterized in that the control means are designed such that at least one pump ( 21 . 31 ) promotes at least at the beginning of the defrosting phase.
  7. Cooling and / or freezing appliance according to one of claims 4 to 6, characterized in that the control means are designed such that at least one pump ( 21 . 31 ) promotes at least the end of defrosting.
  8. Cooling and / or freezing appliance according to one of claims 4 to 7, characterized in that the control means are designed such that at least one pump ( 21 . 31 ) does not promote at the beginning and / or end of the defrosting phase.
  9. Cooling and / or freezing appliance according to one of claims 4 to 8, characterized in that a temperature sensor is provided which determines the temperature of the warm heat exchanger ( 32 ) or the temperature of the warm heat exchanger ( 32 ) detected by the heat transfer medium and that the control means are designed such that they the pump ( 21 . 31 ) operate as a function of the temperature value determined by means of the temperature sensor.
  10. Refrigerated and / or freezer according to one of Claims 4 to 9, characterized in that the control means are designed such that the heat transfer medium from the hot heat exchanger ( 32 ) about the heat exchanger unit that is warm when switching from the cooling mode to the defrosting mode ( 14 ) of the thermoacoustic cooler ( 10 ) to the at least one cold heat exchanger ( 23 . 24 ) to be led.
  11. Cooling and / or freezing appliance according to one of claims 2 to 10, characterized in that upstream and downstream of the at least one cold heat exchanger ( 23 . 24 ) at least one valve ( 22 . 25 ) is arranged.
  12. Cooling and / or freezing appliance according to one of claims 2 to 11, characterized in that connected to the thermoacoustic cooler ( 10 ) a cold subcircuit ( 20 ) and a warm subcircuit ( 30 ), wherein the cold partial circuit ( 20 ) at least one pump ( 21 ), a valve ( 22 ) and at least one cold heat exchanger ( 23 . 24 ) and wherein the warm subcircuit ( 30 ) at least one pump ( 31 ) and at least one warm heat exchanger ( 32 ) having.
  13. Cooling and / or freezing appliance according to claim 12, characterized in that the cold partial circuit ( 20 ) at least two cold heat exchangers ( 23 . 24 ) and a subcircuit ( 26 ) located at an upstream of the cold heat exchanger ( 23 . 24 ) arranged valve ( 22 ) and a cold heat exchanger ( 23 ) having.
  14. Cooling and / or freezing appliance according to claim 13, characterized in that bypass lines ( 40 . 42 ) for bypassing the thermoacoustic cooler ( 10 ) are provided, wherein a first bypass line ( 40 ) at the downstream of the cold heat exchanger ( 23 . 24 ) arranged valve ( 25 ) and the cold subcircuit ( 20 ) with the warm partial circuit ( 30 ) and wherein a second bypass line ( 42 ) provided on a valve ( 33 ) in the warm part cycle ( 30 ) and the warm subcircuit ( 30 ) with the cold part cycle ( 20 ) connects.
  15. Cooling and / or freezing appliance according to claim 14, characterized in that the second bypass line ( 42 ) the warm subcircuit with the subcircuit ( 26 ) of the cold partial cycle ( 20 ) connects.
  16. Cooling and / or freezing appliance according to one of claims 2 to 15, characterized in that the control means are designed such that the switching from the cooling mode to the defrost mode by a time offset in the control of the valves ( 22 . 25 . 33 ) or by a temporal offset of the operation of the thermoacoustic cooler ( 10 ) or by reversing the conveying direction of the heat transfer medium.
  17. Cooling and / or freezing appliance according to one of claims 2 to 16, characterized in that the valves ( 22 . 25 . 33 ) are designed as 3-way valves and / or solenoid valves.
  18. Cooling and / or freezing appliance according to one of the preceding claims, characterized in that the thermoacoustic cooler ( 10 ) two or more than two heat exchanger units ( 14 . 18 ), which are designed such that in these cyclically heating and cooling of the heat transfer medium flowing through this takes place.
  19. Cooling and / or freezing appliance according to one of the preceding claims, characterized in that the heat exchanger units ( 14 . 18 ) of the thermoacoustic cooler ( 10 ) consist of a material with a high thermal conductivity or have such a material.
  20. Cooling and / or freezing appliance according to one of claims 18 or 19, characterized in that the thermoacoustic cooler ( 10 ) a sound wave delivery means ( 12 ), a warm partial cycle ( 30 ) associated heat exchanger unit ( 14 ), a stack ( 16 ) and a cold part cycle ( 20 ) associated heat exchanger unit ( 18 ) having.
  21. Cooling and / or freezing appliance according to claim 20, characterized in that the sound wave delivery means ( 12 ) of the thermoacoustic cooler ( 10 ) comprises a loudspeaker or resonator.
  22. Cooling and / or freezing appliance according to one of claims 20 or 21, characterized in that the on the thermo-acoustic cooler ( 10 ) adjoining frequency and / or amplitude is modulated and / or reversible, so that the cold part cycle ( 20 ) associated heat exchanger unit ( 18 ) and / or the warm partial cycle ( 30 ) associated heat exchanger unit ( 14 ) is coolable.
  23. Cooling and / or freezing appliance according to one of the preceding claims, characterized in that at least one fan ( 50 ) is provided, the at least one cold heat exchanger ( 23 . 24 ) supplies warm air from the refrigerator and / or freezer compartment of the refrigerator and / or freezer.
DE200810055959 2008-08-28 2008-11-05 Fridge and / or freezer Withdrawn DE102008055959A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE202008011494.2 2008-08-28
DE202008011493 2008-08-28
DE202008011493.4 2008-08-28
DE202008011494 2008-08-28
DE200810055959 DE102008055959A1 (en) 2008-08-28 2008-11-05 Fridge and / or freezer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810055959 DE102008055959A1 (en) 2008-08-28 2008-11-05 Fridge and / or freezer
EP09011093A EP2159519A3 (en) 2008-08-28 2009-08-28 Refrigeration and/or freezer device

Publications (1)

Publication Number Publication Date
DE102008055959A1 true DE102008055959A1 (en) 2010-03-04

Family

ID=41606237

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200810055959 Withdrawn DE102008055959A1 (en) 2008-08-28 2008-11-05 Fridge and / or freezer

Country Status (2)

Country Link
EP (1) EP2159519A3 (en)
DE (1) DE102008055959A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11344266A (en) * 1998-06-03 1999-12-14 Sanyo Electric Co Ltd Acoustic freezer
US6688112B2 (en) * 2001-12-04 2004-02-10 University Of Mississippi Thermoacoustic refrigeration device and method
DE202007003577U1 (en) * 2006-12-01 2008-04-10 Liebherr-Hausgeräte Ochsenhausen GmbH Fridge and / or freezer

Also Published As

Publication number Publication date
EP2159519A3 (en) 2010-07-07
EP2159519A2 (en) 2010-03-03

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