EP0926447B1 - Cooking apparatus with heat-recirculation - Google Patents
Cooking apparatus with heat-recirculation Download PDFInfo
- Publication number
- EP0926447B1 EP0926447B1 EP98120408A EP98120408A EP0926447B1 EP 0926447 B1 EP0926447 B1 EP 0926447B1 EP 98120408 A EP98120408 A EP 98120408A EP 98120408 A EP98120408 A EP 98120408A EP 0926447 B1 EP0926447 B1 EP 0926447B1
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- EP
- European Patent Office
- Prior art keywords
- heat
- carrier fluid
- compressor
- heat carrier
- cooking
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
- F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
Definitions
- the invention relates to a cooking device with one of a heat transfer fluid flowed through heat exchanger for direct or indirectly heating a cooking medium that is constantly in the Cooking space is circulated and for example hot air, steam or can be a mixture of hot air and steam.
- a heat transfer fluid flowed through heat exchanger for direct or indirectly heating a cooking medium that is constantly in the Cooking space is circulated and for example hot air, steam or can be a mixture of hot air and steam.
- a heat transfer fluid flowed through heat exchanger for direct or indirectly heating a cooking medium that is constantly in the Cooking space is circulated and for example hot air, steam or can be a mixture of hot air and steam.
- a heat transfer fluid flowed through heat exchanger for direct or indirectly heating a cooking medium that is constantly in the Cooking space is circulated and for example hot air, steam or can be a mixture of hot air and steam.
- the Combustion gases are passed through a heat exchanger, which the cooking medium through direct heat exchange or indirect, e.g.
- a temperature increase can in principle be supplied to a medium by a compressor become.
- a compressor For example, from US 3,988,905 is a simply constructed, based on the compression principle working energy cell known that a heat transfer fluid return includes.
- a compressor for increasing the temperature of the heat transfer fluid by compression which is arranged upstream of the heating heat exchanger is a closed circuit for the heat transfer fluid, being downstream of a relaxation system upstream of the compressor and the heat exchanger is provided to relax the compressed heat transfer fluid, and a device for preheating the heat transfer fluid upstream of the compressor.
- the heat transfer fluid is preferably air; however it can other fluids, e.g. Butane or known from heat pumps Fluids.
- the heat transfer to the cooking medium can be directly or indirectly e.g. over a second Circuit of a heat transfer fluid, by heating water, is obtained from the steam for the cooking medium, or in other suitable way,
- the invention can provide that the preheating device or has several process heat exchangers, which at least part of the waste heat from the cooking device to the heat transfer fluid respectively.
- a heater can be used for the heat transfer fluid upstream of the compressor be provided and / or a device for Feeding of already heated heat transfer fluid upstream be provided by the compressor.
- a cooking device in which a process heat exchanger from is flowed through the heat transfer fluid, which is a heat exchange between the heat transfer fluid and one from the cooking space outflowing cooking medium allowed.
- a cooking device can also be provided which the preheater a process heat exchanger for Has heating the heat transfer fluid through the ambient air.
- the preheating device has a counterflow heat exchanger in which a Heat exchange between the flowing from the heat exchanger compressed, i.e. not relaxed heat transfer fluid and the heat transfer fluid flowing to the compressor takes place.
- the heating device is a Device for supplying the heat transfer fluid to various Has heat exchangers and / or heating devices.
- the cooking device according to the invention can continue in the flow system the heat transfer fluid preferably thermally insulated pressure spokes for compressed heat transfer fluid downstream of the compressor and upstream have of the heat exchanger. This allows for one driving impulses and the other one discontinuous operation of the compressor.
- the waste heat of the device as well as the heat of the emerging Cooking medium, in particular that emerging in the fume hood Vapors to "transform" to a higher temperature level and thus usable for the cooking process. If in a process heat exchanger the heat of the outside Vapors is recovered, there is the advantage that no cooling of these vapors is required.
- the heat of the emerging vapors and, if applicable, that of the environment emitted waste heat can be used, but also through a correspondingly arranged heat exchanger, the heat, that of components of the cooking device, in particular of the Compressor and / or the relaxation system is generated.
- the flow system according to the invention for the heat transfer fluid with compressor and heat exchanger can additionally to a conventional heating system, e.g. with a gas burner, provided a.
- a conventional heating system can, however, also, for example via a heat exchanger, coupled to the flow system for the heat transfer fluid his.
- the cooking device is, for example, a Hot air device or a combined steam / hot air device can, shown only schematically. It has one here only schematically shown cooking space 1 and a blower 2 for circulating the cooking medium, e.g. Hot air, steam or a Mixture of steam and hot air.
- Cooking medium flows around the heat transfer surface of a Heating heat exchanger 3, in which a heat transfer fluid, preferably Air or butane, flows.
- the direction of flow is indicated by the arrows in the figures.
- the cooking device owns still a device sequence 5, through which the uncondensed Parts of the cooking medium leave the device.
- the heat exchanger 3 forms part of a circulatory system for the heat transfer fluid.
- the heat exchanger 3 upstream is a compressor 10 for compression and thus Heating the heat transfer fluid.
- the heat exchanger 3 is a relaxation system 12 downstream, which compressed heat transfer fluid relaxes again after it has left the heat exchanger 3.
- the relaxation system 12 is followed by a multi-way valve 14, via the the expansion device 12 with a process heat exchanger 16 either directly or via a regenerator 18 can be.
- a process heat exchanger 16 takes place a heat exchange between the through the outlet 5 from the Cooking device escaping cooking medium and the heat transfer fluid instead of.
- the heat transfer fluid coming from the process heat exchanger 16 is compressed so far in the compressor 10 that its Temperature above the temperature of the circulated cooking medium lies, the temperature difference is greater, depending the heat transfer fluid is compressed more. Typical temperatures of the cooking medium in operation are in one area from 200 ° C to 400 ° C.
- the one leaving the compressor 10 Heat transfer fluid then flows through the heat exchanger 3 and gives due to the generated by the compressor 10 Temperature difference to the cooking medium heat to the cooking medium from which by the circulation fan 2 on the transfer surface of the heat exchanger is driven past. This heats up the cooking medium while the heat transfer fluid that is still under high pressure, cools.
- the pressure of the Reduced heat transfer fluid leaving heat transfer fluid 3 which is accompanied by a decrease in temperature.
- a typical temperature of the heat transfer fluid after relaxation would be 10 ° C to 20 ° C.
- the temperature of the relaxation system 12 leaving heat transfer fluid is now under the temperature of the cooking medium leaving the cooking appliance and flows through the process heat exchanger 16 and in Operation when leaving the cooking space typically a temperature in the range from 100 ° C to 300 ° C.
- the direct circuit shown in Fig. 1 flows out of the relaxation system 12 escaping heat transfer fluid directly to the process heat exchanger 16 and there on the temperature of the cooking medium escaping via outlet 5 is heated. Thereafter, it becomes the compressor 10 again in the circuit where it is compressed as described above, so that its temperature is again above the temperature of the Cooking medium increased.
- Waste heat is available through the process heat exchanger 16 could be used, it can be provided that Heat transfer fluid from another heat source, e.g. Legs Additional heating or to heat the ambient air. Such Additional heating could for example be between the process heat exchanger 16 and the compressor 10 may be provided. Preheating using the ambient air is shown Embodiment with the help of the regenerator 18th possible.
- the multi-way valve 14 can be shown in FIG. 2 position shown, which causes the Heat transfer fluid not directly, but via the regenerator 18 is fed to the process heat exchanger (16).
- the regenerator 18 is essentially a heat exchanger to exchange heat between the heat transfer fluid and the ambient air. If air is used as the heat transfer fluid, the regenerator 18 may also have an inlet for ambient air and have an outlet for air from the circuit which about a further position, not shown, of the multi-way valve 14, via valves of the regenerator 18 or others can be opened and closed in a suitable manner and with which the cooled in the relaxation system 12 Have air replaced by warmer ambient air, as long as none substantial heating in the process heat exchanger 16 takes place.
- the heat transfer fluid which the relaxation system 12 leaves a temperature in the range of 0 ° C.
- the Process heat exchanger 16 with an electric heater or the like be equipped.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Central Heating Systems (AREA)
- General Preparation And Processing Of Foods (AREA)
- Cookers (AREA)
- Commercial Cooking Devices (AREA)
Abstract
Description
Die Erfindung betrifft ein Gargerät mit einem von einem Wärmeträgerfluid durchströmten Heizwärmeübertrager zum direkten oder indirekten Erwärmen eines Garmediums, das ständig im Garraum umgewälzt wird und beispielsweise Heißluft, Dampf oder ein Gemisch von Heißluft und Dampf sein kann. Es sind z.B. Gargeräte mit einem Gasbrenner bekannt, bei denen die Verbrennungsgase durch einen Wärmeübertrager geleitet werden, der das Garmedium durch direkten Wärmeaustausch oder indirekt, z.B. durch Beheizen eines Dampferzeugers, erwärmt. The invention relates to a cooking device with one of a heat transfer fluid flowed through heat exchanger for direct or indirectly heating a cooking medium that is constantly in the Cooking space is circulated and for example hot air, steam or can be a mixture of hot air and steam. There are e.g. Cooking appliances with a gas burner are known, in which the Combustion gases are passed through a heat exchanger, which the cooking medium through direct heat exchange or indirect, e.g. by heating a steam generator.
Herkömmliche Gargeräte mit Einrichtungen zum Umwälzen, Beheizen und Befeuchten des Garmediums benötigen systembedingt viel Energie zum Garen und zeichnen sich andererseits durch einen hohen Wärmeverlust durch das aus dem Gargerät austretende erhitzte Garmedium und die von dem Gargerät an die Umgebung abgegebene Abwärme aus, wie z. B. aus der gattungsbildenden EP-A-0 344 743 bekannt. Ein Bestreben ist daher, die in der Abwärme gespeicherte Energie zu nutzen, indem man das wärmeübertragende Medium zurückführt. Diese durch die Abwärme abgegebene Energie ist aber durch eine einfache Rückführung nicht wiederverwendbar, da sie in etwa die gleiche oder eine geringere Temperatur wie das Garmedium hat.Conventional cooking devices with devices for circulating, heating and moistening the Due to the system, cooking media require a lot of energy for cooking and, on the other hand, stand out due to high heat loss from the heated cooking medium emerging from the cooking device and the waste heat given off by the cooking appliance to the environment, such as, for. B. from the generic EP-A-0 344 743 known. An effort is therefore made in the waste heat to use stored energy by recycling the heat transfer medium. However, this energy given off by the waste heat is due to a simple return not reusable as it is approximately the same or a lower temperature than that Garmedium has.
Eine Temperaturerhöhung kann einem Medium grundsätzlich durch einen Verdichter zugeführt werden. So ist bspw. aus der US 3,988,905 eine einfach konstruierte, nach dem Verdichtungsprinzip arbeitende Energiezelle bekannt, die eine Wärmeträgerfluidrückführung beinhaltet.A temperature increase can in principle be supplied to a medium by a compressor become. For example, from US 3,988,905 is a simply constructed, based on the compression principle working energy cell known that a heat transfer fluid return includes.
Es ist die Aufgabe der Erfindung, das gattungsgemäße Gargerät derart weiterzuentwickeln, daß es die Nachteile des Stands der Technik überwindet, insbesondere auch Wärme auf einem Temperaturniveau unterhalb der üblichen Gartemperatur des Gargeräts genutzt werden kann.It is the object of the invention to further develop the generic cooking appliance in such a way that it overcomes the disadvantages of the prior art, especially heat on one Temperature level below the usual cooking temperature of the cooking device can be used.
Diese Aufgabe wird gelöst durch einen Verdichter zum Erhöhen der Temperatur des Wärmeträgerfluids durch Verdichten, welcher stromaufwärts von dem Heizwärmeübertrager angeordnet ist, einen geschlossenen Kreislauf für das Wärmeträgerfluid, wobei stromabwärts von dem Heizwärmeübertrager und stromaufwärts von dem Verdichter ein Entspannungssystem zum Entspannen des verdichteten Wärmeträgerfluids vorgesehen ist, und eine Einrichtung zum Vorwärmen des Wärmeträgerfluids stromaufwärts von dem Verdichter. This object is achieved by a compressor for increasing the temperature of the heat transfer fluid by compression, which is arranged upstream of the heating heat exchanger is a closed circuit for the heat transfer fluid, being downstream of a relaxation system upstream of the compressor and the heat exchanger is provided to relax the compressed heat transfer fluid, and a device for preheating the heat transfer fluid upstream of the compressor.
Das Wärmeträgerfluid ist bevorzugt Luft; es können jedoch auch andere Fluide, z.B. Butan oder von Wärmepumpen bekannte Fluide, verwendet werden. Die Wärmeübertragung zu dem Garmedium kann direkt oder indirekt z.B. über einen zweiten Kreislauf eines Wärmeträgerfluids, durch Beheizen von Wasser, aus dem Dampf für das Garmedium gewonnen wird, oder in anderer geeigneter Weise erfolgen,The heat transfer fluid is preferably air; however it can other fluids, e.g. Butane or known from heat pumps Fluids. The heat transfer to the cooking medium can be directly or indirectly e.g. over a second Circuit of a heat transfer fluid, by heating water, is obtained from the steam for the cooking medium, or in other suitable way,
Die Erfindung kann vorsehen, daß die Vorwärmeinrichtung einen oder mehrere Prozeßwärmeübertrager aufweist, welche zumindest einen Teil der Abwärme des Gargeräts dem Wärmeträgerfluid zuführen. Alternativ oder ergänzend kann eine Heizung für das Wärmeträgerfluid stromaufwärts von dem Verdichter vorgesehen sein und/oder es kann eine Einrichtung zum Einspeisen von bereits erwärmtem Wärmeträgerfluid stromaufwärts von dem Verdichter vorgesehen sein.The invention can provide that the preheating device or has several process heat exchangers, which at least part of the waste heat from the cooking device to the heat transfer fluid respectively. Alternatively or in addition, a heater can be used for the heat transfer fluid upstream of the compressor be provided and / or a device for Feeding of already heated heat transfer fluid upstream be provided by the compressor.
Erfindungsgemäß ist auch ein Gargerät vorgesehen, bei dem ein dem Verdichter vorgeschalteter Prozeßwärmeübertrager von dem Wärmeträgerfluid durchströmt wird, der einen Wärmeaustausch zwischen dem Wärmeträgerfluid und einem aus dem Garraum ausströmenden Garmedium gestattet.According to the invention, a cooking device is also provided in which a process heat exchanger from is flowed through the heat transfer fluid, which is a heat exchange between the heat transfer fluid and one from the cooking space outflowing cooking medium allowed.
Erfindungsgemäß kann auch ein Gargerät vorgesehen sein, bei dem die Vorwärmeinrichtung einen Prozeßwärmeübertrager zum Erwärmen des Wärmeträgerfluids durch die Umgebungsluft aufweist.According to the invention, a cooking device can also be provided which the preheater a process heat exchanger for Has heating the heat transfer fluid through the ambient air.
Weiterhin kann auch vorgesehen sein, daß die Vorwärmeinrichtung einen Gegenstromwärmetauscher aufweist, in dem ein Wärmeaustausch zwischen dem von dem Heizwärmeübertrager abströmenden verdichteten, also nicht entspannten Wärmeträgerfluid und dem zu dem Verdichter strömenden Wärmeträgerfluid stattfindet. Furthermore, it can also be provided that the preheating device has a counterflow heat exchanger in which a Heat exchange between the flowing from the heat exchanger compressed, i.e. not relaxed heat transfer fluid and the heat transfer fluid flowing to the compressor takes place.
Weiterhin kann vorgesehen sein, daß die Heizeinrichtung eine Einrichtung zum Zuleiten des Wärmeträgerfluids zu verschiedenen Wärmeübertragern und/oder Heizeinrichtungen aufweist. Furthermore, it can be provided that the heating device is a Device for supplying the heat transfer fluid to various Has heat exchangers and / or heating devices.
Das erfindungsgemäße Gargerät kann weiterhin in dem Strömungssystem des Wärmeträgerfluids einen vorzugsweise thermisch isolierten Druckspeichen für komprimiertes Wärmeträgerfluid stromabwärts von dem Verdichter und stromaufwärts von dem Heizwärmeübertrager aufweisen. Dies ermöglicht zum einen das Fahren von Stoßleistungen und andererseits einen diskontinuierlichen Betrieb des Verdichters.The cooking device according to the invention can continue in the flow system the heat transfer fluid preferably thermally insulated pressure spokes for compressed heat transfer fluid downstream of the compressor and upstream have of the heat exchanger. This allows for one driving impulses and the other one discontinuous operation of the compressor.
Durch das erfindungsgemäß vorgesehene Gargerät ist es möglich, die Abwärme des Gerätes sowie die Wärme des austretenden Garmediums, insbesondere der im Dampfabzug austretenden Wrasen, auf ein höheres Temperaturniveau zu "transformieren" und somit für den Garprozeß nutzbar zu machen. Wenn in einem Prozeßwärmeübertrager die Wärme der nach außen abgeleiteten Wrasen rückgewonnen wird, ergibt sich der Vorteil, daß keine Kühlung dieser Wrasen erforderlich ist.It is through the cooking device provided according to the invention possible, the waste heat of the device as well as the heat of the emerging Cooking medium, in particular that emerging in the fume hood Vapors to "transform" to a higher temperature level and thus usable for the cooking process. If in a process heat exchanger the heat of the outside Vapors is recovered, there is the advantage that no cooling of these vapors is required.
In einer weiteren Ausgestaltung der Erfindung kann nicht nur die Wärme der austretenden Wrasen und ggf. die an die Umgebung abgegebene Abwärme genutzt werden, sondern auch, durch einen entsprechend angeordneten Wärmeübertrager, die Wärme, die von Komponenten des Gargerätes, insbesondere von dem Verdichter und/oder dem Entspannungssystem, erzeugt wird.In a further embodiment of the invention, not only can the heat of the emerging vapors and, if applicable, that of the environment emitted waste heat can be used, but also through a correspondingly arranged heat exchanger, the heat, that of components of the cooking device, in particular of the Compressor and / or the relaxation system is generated.
Das erfindungsgemäße Strömungssystem für das Wärmeträgerfluid mit Verdichter und Heizwärmeübertrager kann zusätzlich zu einem herkömmlichen Heizsystem, z.B. mit einem Gasbrenner, vorgesehen ein. Ein derartiges herkömmliches Heizsystem kann jedoch auch, beispielsweise über einen Wärmeübertrager, mit dem Strömungssystem für das Wärmeträgerfluid gekoppelt sein.The flow system according to the invention for the heat transfer fluid with compressor and heat exchanger can additionally to a conventional heating system, e.g. with a gas burner, provided a. Such a conventional heating system can, however, also, for example via a heat exchanger, coupled to the flow system for the heat transfer fluid his.
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel anhand der beigefügten Zeichnungen mit weiteren Einzelheiten erläutert.
- Fig. 1
- zeigt schematisch die Komponenten eines erfindungsgemäßen Gargerätes mit einem geschlossenen Kreislauf des Wärmeträgerfluids mit einem Mehrwegehahn.
- Fig. 2
- zeigt ein Gargerät wie in Fig. 1, jedoch mit einer anderen Stellung des Mehrwegehahns.
- Fig. 1
- shows schematically the components of a cooking device according to the invention with a closed circuit of the heat transfer fluid with a multi-way valve.
- Fig. 2
- shows a cooking device as in Fig. 1, but with a different position of the multi-way valve.
In den Zeichnungen ist das Gargerät, das beispielsweise ein
Heißluftgerät oder ein kombiniertes Dampf/Heißluftgerät sein
kann, lediglich schematisch dargestellt. Es besitzt einen
hier nur schematisch dargestellten Garraum 1 und ein Gebläse
2 zum Umwälzen des Garmediums, z.B. Heißluft, Dampf oder ein
Gemisch aus Dampf und Heißluft. Das von dem Gebläse 2 umgewälzte
Garmedium umströmt die Wärmeübertragungsfläche eines
Heizwärmeübertragers 3, in dem ein Wärmeträgerfluid, vorzugsweise
Luft oder Butan, strömt. Die Strömungsrichtung ist
in den Figuren mit den Pfeilen angegeben. Das Gargerät besitzt
weiterhin einen Geräteablauf 5, über den die nichtkondensierten
Anteile des Garmediums das Gerät verlassen.In the drawings, the cooking device is, for example, a
Hot air device or a combined steam / hot air device
can, shown only schematically. It has one
here only schematically shown
Der Heizwärmeübertrager 3 bildet einen Teil eines Kreislaufsystems
für das Wärmeträgerfluid. Dem Heizwärmeübertrager 3
vorgeschaltet ist ein Verdichter 10 zum Verdichten und damit
Erwärmen des Wärmeträgerfluids. Dem Heizwärmeübertrager 3
ist ein Entspannungssystem 12 nachgeschaltet, welches das
verdichtete Wärmeträgerfluid wieder entspannt, nachdem es
den Heizwärmeübertrager 3 verlassen hat. Dem Entspannungssystem
12 nachgeschaltet ist ein Mehrwegehahn 14, über den
die Entspannungsvorrichtung 12 mit einem Prozeßwärmeübertrager
16 entweder direkt oder über einen Regenerator 18 verbunden
werden kann. In dem Prozeßwärmeübertrager 16 findet
ein Wärmeaustausch zwischen dem über den Ablauf 5 aus dem
Gargerät austretenden Garmedium und dem Wärmeträgerfluid
statt. The
Das von dem Prozeßwärmeübertrager 16 kommende Wärmeträgerfluid
wird in dem Verdichter 10 soweit verdichtet, daß seine
Temperatur über der Temperatur des umgewälzten Garmediums
liegt, wobei die Temperaturdifferenz umso größer ist, je
stärker das Wärmeträgerfluid komprimiert wird. Typische Temperaturen
des Garmediums im Betrieb liegen in einem Bereich
von 200 °C bis 400 °C. Das den Verdichter 10 verlassende
Wärmeträgerfluid durchströmt dann den Heizwärmeübertrager 3
und gibt dabei aufgrund der durch den Verdichter 10 erzeugten
Temperaturdifferenz zu dem Garmedium Wärme an das Garmedium
ab, welches durch das Umwälzgebläse 2 an der Übertragungsfläche
des Heizwärmeübertragers vorbeigetrieben wird.
Dadurch wird das Garmedium aufgeheizt, während sich das Wärmeträgerfluid,
das nach wie vor unter hohem Druck steht,
abkühlt. In dem Entspannungssystem 12 wird der Druck des den
Heizwärmeübertrager 3 verlassenden Wärmeträgerfluids reduziert,
was mit einer Temperaturverringerung einhergeht. Eine
typische Temperatur des Wärmeträgerfluids nach dem Entspannen
wäre 10 °C bis 20 °C. Die Temperatur des das Entspannungssystem
12 verlassenden Wärmeträgerfluids liegt nun unter
der Temperatur des Garmediums, welches das Gargerät verläßt
und den Prozeßwärmeübertrager 16 durchströmt und das im
Betrieb beim Verlassen des Garraums typischerweise eine Temperatur
im Bereich von 100 °C bis 300 °C aufweist. Bei der
in Fig. 1 gezeigten Direktschaltung strömt das aus dem Entspannungssystem
12 austretende Wärmeträgerfluid direkt zu
dem Prozeßwärmeübertrager 16 und wird dort auf die Temperatur
des über den Ablauf 5 austretenden Garmediums erwärmt.
Danach wird es in dem Kreislauf wieder zu dem verdichter 10
geleitet, wo es wie vorangehend beschrieben verdichtet wird,
so daß sich seine Temperatur wieder über die Temperatur des
Garmediums erhöht.The heat transfer fluid coming from the
Da zu Beginn eines Garprozesses keine oder nur eine geringe
Abwärme zur Verfügung steht, die über den Prozeßwärmeübertrager
16 genutzt werden könnte, kann vorgesehen sein, das
Wärmeträgerfluid durch eine andere Wärmequelle, z. B. eine
Zusatzheizung oder die Umgebungsluft zu erwärmen. Eine derartige
Zusatzheizung könnte beispielsweise zwischen dem Prozeßwärmeübertrager
16 und dem Verdichter 10 vorgesehen sein.
Ein Vorwärmen mit Hilfe der Umgebungsluft ist bei dem dargestellten
Ausführungsbeispiel mit Hilfe des Regenerators 18
möglich. Hierfür kann der Mehrwegehahn 14 in die in Fig. 2
dargestellte Position gebracht werden, was bewirkt, daß das
Wärmeträgerfluid nicht direkt, sondern über den Regenerator
18 dem Prozeßwärmeübertrager (16) zugeführt wird.Since there is no or only a small amount at the beginning of a cooking process
Waste heat is available through the
Der Regenerator 18 ist im wesentlichen ein Wärmeübertrager
zum Austausch von Wärme zwischen dem Wärmeträgerfluid und
der Umgebungsluft. Wird als Wärmeträgerfluid Luft verwendet,
kann der Regenerator 18 auch einen Einlaß für Umgebungsluft
und einen Auslaß für Luft aus dem Kreislauf aufweisen, die
über eine weitere, nicht dargestellte Stellung des Mehrwegehahns
14, über Ventile des Regenerators 18 oder auf andere
geeignete Weise geöffnet und geschlossen werden können und
mit denen sich die in dem Entspannungssystem 12 abgekühlte
Luft durch wärmere Umgebungsluft ersetzen läßt, solange keine
wesentliche Erwärmung in dem Prozeßwärmeübertrager 16
stattfindet.The
Zum Erzielen eines möglichst geringen Energieverbrauchs kann vorgesehen sein, daß die Verdichter- und die Entspannungsmaschine auf einer gemeinsamen Welle arbeiten.To achieve the lowest possible energy consumption be provided that the compressor and the expansion machine work on a common wave.
Zu Beginn des Betriebs kann das Wärmeträgerfluid, welches
das Entspannungssystem 12 verläßt, eine Temperatur im Bereich
von 0 °C besitzen. Um Vereisungen zu vermeiden, die
aufgrund der geringen Temperatur des auströmenden Garmediums
bei Beginn eines Garprozesses entstehen können, kann der
Prozeßwärmeübertrager 16 mit einer elektrischen Heizung oder
dergleichen ausgerüstet sein. At the start of operation, the heat transfer fluid, which
the
- 11
- Garraumoven
- 22
- Umwälzgebläsecirculating fan
- 33
- HeizwärmeübertragerHeating exchangers
- 55
- Geräteablaufunit drain
- 1010
- Verdichtercompressor
- 1212
- Entspannungssystemrelaxation system
- 1414
- MehrwegehahnSelector valve
- 1616
- ProzeßwärmeübertragerProcess heat exchanger
- 1818
- Regeneratorregenerator
Claims (8)
- A cooking appliance comprising a heating heat-exchanger (3) through which a heat carrier fluid flows for direct or indirect delivery of heat to the cooking medium in the cooking appliance, characterised by a compressor (10) for raising the temperature of the heat carrier fluid by compression, such compressor being disposed upstream of the heating heat-exchanger (3), a closed circuit for the heat carrier fluid, an expansion system (12) for expanding the compressed heat carrier fluid being provided downstream of the heating heat-exchanger (3) and upstream of the compressor (10), and a device for preheating the heat carrier fluid (16, 18) upstream of the compressor (10).
- A cooking appliance according to claim 1, characterised in that the preheating device comprises one or more process heat-exchangers (16), which feed at least some of the waste heat of the cooking appliance to the heat carrier fluid.
- A cooking appliance according to claim 2, characterised by a process heat-exchanger (16) which precedes the compressor (10) and through which the heat carrier fluid flows, and which allows heat-exchange between the heat carrier fluid and a cooking medium leaving the cooking appliance cooking chamber (1).
- A cooking appliance according to claim 2 or 3, characterised in that the preheating device comprises a process heat-exchanger (18) for heating the heat carrier fluid by means of the ambient air.
- A cooking appliance according to any one of claims 1 to 4, characterised in that the preheating device comprises a counter-current heat-exchanger, in which a heat exchange takes place between the compressed heat carrier fluid flowing out of the heating heat-exchanger (3) and the heat carrier fluid flowing to the compressor (10).
- A cooking appliance according to any one of claims 1 to 5, characterised by a device for feeding fresh heat carrier fluid (18) upstream of the compressor (10).
- A cooking appliance according to any one of claims 1 to 5, characterised in that the preheating device comprises a device (14) for feeding the heat carrier fluid to different heat-exchangers and/or heating devices.
- A cooking appliance according to any one of claims 1 to 7, characterised by a pressure accumulator for a compressed heat carrier fluid downstream of the compressor (10) and upstream of the heating heat exchanger (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19757415 | 1997-12-23 | ||
| DE19757415A DE19757415C1 (en) | 1997-12-23 | 1997-12-23 | Cooking oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0926447A1 EP0926447A1 (en) | 1999-06-30 |
| EP0926447B1 true EP0926447B1 (en) | 2002-07-17 |
Family
ID=7853101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98120408A Expired - Lifetime EP0926447B1 (en) | 1997-12-23 | 1998-10-28 | Cooking apparatus with heat-recirculation |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0926447B1 (en) |
| AT (1) | ATE220784T1 (en) |
| DE (2) | DE19757415C1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2221545A1 (en) * | 2010-01-08 | 2010-08-25 | V-Zug AG | Oven with latent heat reservoir |
| CN107388310B (en) * | 2017-07-19 | 2019-03-26 | 佛山市众拓科技有限公司 | It is a kind of using heat pump as the whole kitchen system of the heat supply absorption refrigeration fume eliminating of the energy |
| CN111802906B (en) * | 2020-06-30 | 2021-05-18 | 宁波方太厨具有限公司 | Heating equipment capable of adjusting steam flow direction |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1500266A (en) * | 1966-09-16 | 1967-11-03 | Safety heater | |
| US3988905A (en) * | 1975-09-24 | 1976-11-02 | Will Clarke England | Reversible mechanical-thermal energy cell |
| US4539816A (en) * | 1981-04-03 | 1985-09-10 | Minnesota Mining And Manufacturing Company | Heat and liquid recovery using open cycle heat pump system |
| IT1220754B (en) * | 1988-06-01 | 1990-06-21 | Zanussi Grandi Impianti Spa | FORCED CONVECTION GAS COOKING OVEN |
| EP0856705B1 (en) * | 1997-01-30 | 2002-02-20 | Rational AG | Arrangement of heat exchanger |
-
1997
- 1997-12-23 DE DE19757415A patent/DE19757415C1/en not_active Expired - Fee Related
-
1998
- 1998-10-28 EP EP98120408A patent/EP0926447B1/en not_active Expired - Lifetime
- 1998-10-28 AT AT98120408T patent/ATE220784T1/en not_active IP Right Cessation
- 1998-10-28 DE DE59804790T patent/DE59804790D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ATE220784T1 (en) | 2002-08-15 |
| DE19757415C1 (en) | 1999-04-08 |
| EP0926447A1 (en) | 1999-06-30 |
| DE59804790D1 (en) | 2002-08-22 |
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