EP0121809B1 - Smoke extracting hood - Google Patents

Smoke extracting hood Download PDF

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Publication number
EP0121809B1
EP0121809B1 EP84102732A EP84102732A EP0121809B1 EP 0121809 B1 EP0121809 B1 EP 0121809B1 EP 84102732 A EP84102732 A EP 84102732A EP 84102732 A EP84102732 A EP 84102732A EP 0121809 B1 EP0121809 B1 EP 0121809B1
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EP
European Patent Office
Prior art keywords
hood
fresh air
heat exchange
chamber
supply air
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EP84102732A
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German (de)
French (fr)
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EP0121809A1 (en
Inventor
Markus Schmalhofer
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Individual
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Individual
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Priority to AT84102732T priority Critical patent/ATE21448T1/en
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    • 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
    • F24C15/20—Removing cooking fumes

Definitions

  • the invention relates to an extractor hood according to the preamble of claim 1.
  • An extractor hood corresponding to the preamble of claim 1 is known for example from DE-A-30 11 101 and is particularly suitable for use in commercial kitchens.
  • the generic extractor hood has a housing in which an elongated suction chamber is arranged. Above the suction chamber, which is arranged above the cooker or the like producing cooker or the like, the warm exhaust air for removal from the kitchen is fed, for example by means of a fan, to an exhaust air connection from which the exhaust air is discharged into the environment.
  • the known extractor hood also has a supply air storage space and a supply air collection space, between which heat exchange elements of a recuperator arranged in the suction space of the hood are arranged.
  • the heat exchange elements are flowed through by the supply air supplied via the supply air storage space and by the warm exhaust air conveyed into the suction space, whereby a large part of the heat content of the exhaust air can be transferred to the supply air, which after heating is conveyed into the kitchen via exhaust openings of the extractor hood .
  • Another advantage is that the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood enables a larger heat exchange surface per meter of hood length, which results in a very high utilization of the heat content of the exhaust air and thus a very good efficiency of the hood.
  • the extractor hood according to the invention has the particular advantage that the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood offers greater possibilities for adaptation to those caused by different hood lengths Changes in the flow conditions on the supply air and exhaust air side result, which in turn also allows the heat transfer variables, which are also dependent in part on the hood length and the associated changes in the supply air quantities and exhaust air quantities, to be set to values which enable the extractor hood to be optimally efficient.
  • the single figure of the drawing shows a schematically greatly simplified perspective illustration of a central region of an extractor hood according to the invention.
  • the extractor hood 1 according to the invention, of which a central region is shown in the figure, is suspended from the ceiling of a kitchen in a manner not shown in the present example.
  • the hood has a housing 2, in which an elongated suction space 3 is arranged, which can be covered, for example with a grid, not shown in the figure, for example made of expanded material.
  • a collecting space 4 is arranged above the suction space 3 and has a supply air storage space 5, a supply air collecting space 6 and an exhaust air collecting space 7.
  • the supply air storage space 5 and the supply air collection space 6 are each divided into two subspaces 8 and 9 or 10 and 11.
  • the subspaces 8 and 9 of the supply air storage space 5 and the subspaces 10 and 11 of the supply air collection space 6 extend at least approximately over the entire length of the hood and are arranged on both sides of the exhaust air collection space 7 along the two edges of the hood.
  • the two subspaces 8 and 9 of the supply air storage space 5 directly adjoin the exhaust air collecting space 7 and are separated from the exhaust air collecting space 7 by means of upright side walls 12 and 13.
  • the subspaces 8 and 9 of the supply air storage space 5 adjoin the subspaces 10 and 11 of the supply air plenum 6, which are also separated from the subspaces 8 and 9 by upright walls 14 and 15.
  • the subspaces 10 and 11 of the supply air collecting space 6 are connected to the interior of the kitchen, in which the extractor hood 1 according to the invention is arranged, via outlet openings 16 and 17 in side walls 18 and 19.
  • the collecting space 4 is covered with a ceiling wall 20 which extends over the supply air storage space 5, the supply air collecting space 6 and the exhaust air collecting space 7.
  • the subspaces 8 and 9 of the supply air supply space 5 are connected to two distributor ducts 21 and 22 which open into a central supply air duct 23.
  • the supply air duct 23 is connected to the environment in a manner not shown in detail and conveys supply air into the supply air supply space 5.
  • the exhaust air collecting space 7 is connected via an exhaust air connection 24 to an exhaust air duct 25 which discharges the exhaust air extracted from the kitchen into the environment.
  • heat exchange elements 26 are arranged transversely to the longitudinal direction of the hood.
  • the heat exchange elements 26, which in the example are essentially trapezoidal plates made of a material such as copper or aluminum, which is particularly suitable for good heat transfer are arranged at a distance of a few millimeters from one another, where a particularly preferred distance is approximately 5 mm.
  • the distances between the heat exchange elements 26 designed as plates are determined by means of a spacer 27, flow channels 28 and 29 being formed between two heat exchange elements 26, which are used to guide the exhaust air or supply air.
  • the two plates 26 in the front limit a flow channel 28 for exhaust air, the surface 30 adjacent to the underside of the collecting space 4 between the heat exchange elements 26 by means of the spacer 27 being formed in part, as shown a passage opening 31 for exhaust air is covered.
  • a flow channel 29 directly adjoins the flow channel 28, which in turn is delimited by two heat exchange elements 26 designed as plates and is provided for guiding supply air.
  • the horizontal surface 32 bordering on the underside of the collecting space 4, delimited by the plates 26 of the flow channel 29, is partially covered by the spacer 27 to form an inlet and outlet opening 33 and 34 for supply air, respectively, while that according to the selected representation downward-facing surfaces 35, 36 and 37 delimited by the plates 26 of the flow channel 29 are completely covered by the spacer 27.
  • All flow channels 28 and 29 for exhaust air or supply air of the heat exchanger elements 26, which are combined as plates by means of the spacer 27 to form a heat exchange module, are designed in the manner described above, so that along the longitudinal direction of the housing 2 of the hood, a flow channel 28 for exhaust air alternately side by side and a flow channel 29 for supply air are arranged in the immediate vicinity of one another, the heat exchange elements 26 being arranged transversely to the longitudinal direction of the hood.
  • the through openings 31 for exhaust air which are formed by the partial covering of the surfaces 30 adjoining the underside of the collecting space 4 are connected to the exhaust air collecting space 7, while the inlet openings 33 of the flow channels 29 for supply air are connected to the subspaces 8 and 9 of the supply air storage space 5 and the outlet openings 34 the subspaces 10 and 11 of the supply air plenum 6 are connected.
  • filters 38 and 39 which extend over the entire length of the hood and are suspended in the hood in an oblique arrangement, and whose lower ends are arranged in a catch surface 40 arranged horizontally in the hood.
  • the filters 38 and 39 are permeable to air, so that the exhaust air sucked in from the stove upwards can penetrate the filters 38 and 39.
  • the filters 38 and 39 catch condensation water and liquid fat particles which precipitate out as a result of the condensation effect during the heat transfer from the exhaust air to the supply air and discharge them into the collecting surface 40.
  • warm exhaust air is sucked in from the stove upwards into the housing 2, for example by means of a blower, not shown, and is conveyed through the filters 38 and 39 into the flow channels 38 for exhaust air.
  • supply air is conveyed via the supply air duct 23 into the distribution ducts 21 and 22, which convey the supply air into the subspaces 8 and 9 of the supply air supply space 5.
  • the supply air is conveyed via the inlet openings 33 into the flow channels 29 for supply air, with the inlet openings 33 in the illustrated embodiment alternatingly along the longitudinal direction of the housing 2, supply air via the inlet openings 33 arranged in the partial space 8 and in the partial space 9 lead into the flow channels 29.
  • the supply air heated by the heat transfer between the exhaust air and the supply air alternately exits through the outlet openings 34 in the subspaces 10 and 11, after which the heated supply air via the exhaust openings 16 and 17 into the interior of the kitchen at least approximately parallel to the ceiling Generation of a room air roller to be blown out.
  • the alternate arrangement of the inlet openings 33 and the outlet openings 34 selected in the illustrated embodiment is necessary in order to obtain a hood that can blow heated supply air into the interior on its two longitudinal sides, for which purpose an arrangement of the subspaces 10 and 11 in the immediate vicinity of the Longitudinal edges of the hood is required.
  • a subdivision into two subspaces 8 and 9 or 10 and 11 of the supply air supply space 5 or the supply air collection space 6 is not necessary, so that for such a hood, for example, the subspace 8 and the Partial space 10 of the supply air storage space 5 or the supply air collection space 6 could be combined to form a supply air storage space, in which case the outlet openings 34 would form inlet openings 33 which could promote the supply air to be heated into the supply air storage space 5, which would then be formed by the part spaces 9 and 11 , in which case each inlet opening 33 would form an outlet opening 34 for supply air in this supply air storage space.
  • the supply air is alternately introduced into the flow channels 29 via the inlet openings 33 in the subspaces 8 and 9 of the supply air supply space 5 and after heating by the warm one Exhaust air is introduced via the outlet openings 34 into the subspaces 10 and 11 of the supply air collecting space 6, so that it is possible to blow out heated supply air in both directions via the outlet openings 16 and 17.
  • the exhaust air is introduced via the flow channels 28 and the passage openings 31 into the exhaust air collecting space 7, from which the exhaust air is discharged via the exhaust air connection 24 into the exhaust air channel 25 and from there into the environment.
  • the arrangement of the heat exchange elements 26 transversely to the longitudinal direction of the hood gives the advantage that, depending on the length of the hood and the resulting supply air and exhaust air quantities, a corresponding number of heat exchange elements 26 and a resulting number of flow channels 28 and 29 for exhaust and supply air can be selected that enables optimal flow and heat transfer conditions.
  • the cross-sectional areas of the flow channels 28 that are particularly suitable for optimal flow and heat transfer conditions and 29 to be determined and determined in the manufacture of the heat exchange modules.
  • Such a base unit can then be used to produce hoods of different lengths for different purposes, with a suitable number of heat exchange modules being able to be provided in accordance with the amounts of exhaust air and supply air to be expected, in order to achieve the optimum flow and heat transfer conditions which achieve optimum efficiency of the extractor hood 1 enables.
  • the extractor hood 1 according to the invention is also possible.
  • the side walls 18 and 19 with the blow-out openings 16 and 17 are arranged inclined downward in a hewing state, so that roof-like connecting areas in when a plurality of extractor hoods 1 are joined together along their longitudinal edges to form a suspended ceiling Let form the joined side walls 18 and 19 of the respective extractor hoods 1.
  • the heat exchange surface which is particularly important for a high degree of efficiency in the heat exchange between exhaust air and supply air, can be significantly increased compared to known hoods by the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood, which means with the extractor hood according to the invention 1 a particularly high degree of efficiency can be achieved.
  • Efficiencies of between 70 and 80% were determined in the case of hoods of the design according to the invention, with plate thicknesses of approximately 0.3 mm and plate spacing of 5 mm having proven particularly advantageous when designing the heat exchange elements 26.
  • the blower performance for conveying exhaust air and supply air may be lower than with known hoods.
  • the high efficiency there is a very high formation of condensate and thus a very high fat separation from the extracted exhaust air, it being determined with a hood of the design according to the invention that the degree of fat separation can be so high that additional measures to avoid fires and explosions can be taken can be dispensed with.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Prevention Of Fouling (AREA)
  • Soy Sauces And Products Related Thereto (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cyclones (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

1. Fume hood with an elongate extraction chamber, with an exit air connection for discharging extracted exit air and with a fresh air supply chamber and a fresh air collection chamber, between which heat exchange elements, through which fresh air can flow, of a recuperator are arranged which is provided in the extraction chamber of the hood and around which the exit air flows, characterized in that the fresh air supply chamber (5) and the fresh air collection chamber (6) are arranged in the region of the top side of the extraction chamber (3) each along one edge of the hood and extend over at least approximately the entire length of the hood, and that the heat exchange elements (26) are arranged transversely to the longitudinal direction of the hood.

Description

Die Erfindung betrifft eine Dunstabzugshaube nach dem Oberbegriff des Anspruchs 1.The invention relates to an extractor hood according to the preamble of claim 1.

Eine dem Oberbegriff des Anspruchs 1 entsprechende Dunstabzugshaube ist beispielsweise aus der DE-A- 30 11 101 bekannt und ist insbesondere für den Einsatz in Großküchen geeignet. Die gattungsgemäße Dunstabzugshaube weist ein Gehäuse auf, in dem ein langgestreckter Saugraum angeordnet ist. Ober dem Saugraum, der über dem den Dunst oder dgl. erzeugenden Herd bzw. Herden angeordnet ist, wird die warme Abluft zur Abführung aus der Küche beispielsweise mittels eines Gebläses einem Abluftanschluß zugeführt, von dem aus die Abluft in die Umgebung abgeleitet wird. Die bekannte Dunstabzugshaube weist weiterhin einen Zuluftvorlageraum und einen Zuluftsammelraum auf, zwischen denen Wärmetauschelemente eines im Saugraum der Haube angeordneten Rekuperators angeordnet sind. Die Wärmetauschelemente werden von der über den Zuluftvorlageraum zugeführten Zuluft durchströmt und von der in den Saugraum geförderten warmen Abluft umströmt, wobei ein großer Teil des Wärmeinhaltes der Abluft auf die Zuluft übertragen werden kann, die nach ihrer Erwärmung über Ausblasöffnungen der Dunstabzugshaube in die Küche gefördert wird.An extractor hood corresponding to the preamble of claim 1 is known for example from DE-A-30 11 101 and is particularly suitable for use in commercial kitchens. The generic extractor hood has a housing in which an elongated suction chamber is arranged. Above the suction chamber, which is arranged above the cooker or the like producing cooker or the like, the warm exhaust air for removal from the kitchen is fed, for example by means of a fan, to an exhaust air connection from which the exhaust air is discharged into the environment. The known extractor hood also has a supply air storage space and a supply air collection space, between which heat exchange elements of a recuperator arranged in the suction space of the hood are arranged. The heat exchange elements are flowed through by the supply air supplied via the supply air storage space and by the warm exhaust air conveyed into the suction space, whereby a large part of the heat content of the exhaust air can be transferred to the supply air, which after heating is conveyed into the kitchen via exhaust openings of the extractor hood .

Obwohl sich das prinzip der gattungsgemäßen Dunstabzugshaube in der Praxis bestens bewährt hat, wobei insbesondere der gute Wirkungsgrad der Wärmeübertragung von der Abluft auf die Zuluft eine beträchtliche Energieersparnis bei der Beheizung von Küchen ermöglicht, ergeben sich aufgrund der in Längsrichtung des Saugraumes angeordneten Wärmetauschelemente des Rekuperators Wirkungsgradverluste beim Wärmeaustausch zwischen Abluft und Zuluft, da im in Strömungsrichtung der Zuluft gesehen hinteren Bereich der Wärmetauschelemente die Zuluft bereits stark erwärmt ist, so daß die für einen Wärmeaustausch mit hohem Wirkungsgrad erforderliche Temperaturdifferenz zwischen Zuluft und Abluft bereits so gering ist, daß die Ausnutzung der im hinteren Bereich der Wärmetauschelemente vorbeiströmenden Abluft deutlich geringer als im vorderen Bereich der Wärmetauschelemente ist.Although the principle of the generic extractor hood has proven its worth in practice, with the good efficiency of heat transfer from the exhaust air to the supply air making considerable energy savings possible when heating kitchens, there are efficiency losses due to the heat exchange elements of the recuperator arranged in the longitudinal direction of the suction chamber when exchanging heat between exhaust air and supply air, since in the rear area of the heat exchange elements as seen in the direction of flow of the supply air, the supply air is already very hot, so that the temperature difference between supply air and exhaust air required for high-efficiency heat exchange is already so low that the utilization of the Exhaust air flowing past the rear area of the heat exchange elements is significantly less than in the front area of the heat exchange elements.

Weiterhin ergibt sich aus dem Umstand, daß pro Meter Haubenlänge ein gewisses Volumen Abluft abgesaugt wird, die zur Ermöglichung eines ständigen Luftaustausches durch eine entsprechende Menge Zuluft zu ersetzen ist, die Folge, daß die Zuluft je nach angesaugter Menge mit unterschiedlichen Strömungsgeschwindigkeiten durch die als Hohlkörper ausgebildeten Wärmetauschelemente hindurchgefördert wird, da die Zahl der Wärmetauschelemente und die sich daraus ergebende Durchtrittsfläche für die Zuluft unveränderbar ist. Dies ergibt zunächst aufgrund der bei großen Zuluftfördermengen in längeren Hauben höheren Strömungsgeschwindigkeiten und längeren Strömungswegen für die Zuluft größere Strömungsverluste. Infolge der unterschiedlichen Strömungsbedingungen ergeben sich bei unterschiedlich langen gattungsgemäßen Dunstabzugshauben aufgrund der unterschiedlichen Zuluftfördermengen, die von der Länge der Haube abhängig sind, des aber andererseits zur Förderung der Zuluft zur Verfügung stehendon konstanten Strömungsquerschnittes der wärmetauschelemente unterschiedliche Wärmeübergangsbedingungen zwischen Zuluft und Abluft.Furthermore, it follows from the fact that a certain volume of exhaust air is extracted per meter of hood length, which must be replaced by a corresponding amount of supply air to enable a constant air exchange, the consequence that the supply air, depending on the amount sucked in, with different flow rates through the hollow body trained heat exchange elements is promoted because the number of heat exchange elements and the resulting passage area for the supply air is unchangeable. First of all, this results in greater flow losses due to the higher flow velocities and longer flow paths for the supply air with large supply air flow rates in longer hoods. As a result of the different flow conditions, there are different types of extractor hoods of different lengths due to the different supply air flow rates, which depend on the length of the hood, but which, on the other hand, are available to promote the supply air and the constant flow cross-section of the heat exchange elements results in different heat transfer conditions between supply air and extract air.

Somit ergeben sich unterschiedliche, von der Haubenlänge abhängige und sich über die Haubenlänge ändernde Wirkungsgrade beim Wärmeaustausch zwischen Zuluft und Abluft.This results in different efficiencies depending on the hood length and changing over the hood length in the heat exchange between supply air and exhaust air.

Es ist daher Aufgabe der Erfindung, eine Dunstabzugshaube der im Oberbegriff des Anspruchs 1 umrissenen Gattung zu schaffen, mit der auch bei unterschiedlichen Haubenlängen eine gleiche und über die Haubenlänge hinweg gleichmäßige und optimierte Ausnutzung des Wärmeinhalts der Abluft möglich ist.It is therefore an object of the invention to provide an extractor hood of the type outlined in the preamble of claim 1, with which the same and optimized and uniform utilization of the heat content of the exhaust air is possible even with different hood lengths.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.

Dadurch wird zunächst erreicht, daß es bei längeren Hauben mit größerem Zuluftbedarf möglich ist, die Eintrittsfläche für die Zuluft durch Anordnen einer größeren Zahl von quer zur Längsrichtung der Haube verlaufenden Wärmetauschelementen zu erhöhen. Daraus ergibt sich der Vorteil, daß optimale Strömungsverhältnisse für die Zuluftförderung vorbestimmt und durch Anordnung von einer der Haubenlänge entsprechenden, optimale Strömungsverhältnisse gewährleistenden Zahl von Wärmetauschelementen realisiert werden können. Dieser Vorteil kann auch hinsichtlich der Abluftströmung durch entsprechende Zahl und Anordnung der Wärmetauschelemente erreicht werden.In this way it is first achieved that with longer hoods with a larger supply air requirement it is possible to increase the inlet area for the supply air by arranging a larger number of heat exchange elements running transversely to the longitudinal direction of the hood. This results in the advantage that optimum flow conditions for the supply of air can be predetermined and can be realized by arranging a number of heat exchange elements which ensure optimal flow conditions and correspond to the hood length. This advantage can also be achieved with regard to the exhaust air flow by appropriate number and arrangement of the heat exchange elements.

Ein weiterer Vorteil besteht darin, daß die Anordnung der Wärmetauschelemente quer zur Längsrichtung der Haube eine größere Wärmetauschfläche pro Meter Haubenlänge möglich macht, was eine sehr hohe Ausnutzung des Wärmeinhaltes der Abluft und damit einen sehr guten Wirkungsgrad der Haube zur Folge hat.Another advantage is that the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood enables a larger heat exchange surface per meter of hood length, which results in a very high utilization of the heat content of the exhaust air and thus a very good efficiency of the hood.

Weiterhin ergibt sich der Vorteil, daß die Temperaturdifferenz zwischen Zuluft und Abluft, die für einen hohen Wirkungsgrad von großer Bedeutung ist, entlang der Längserstreckung der Haube in allen Haubenbereichen in der gleichen Größenordnung liegt, da durch die Anordnung der Wärmetauschelemente quer zur Längsrichtung der Haube eine Zuführung von noch nicht erwärmter Zuluft in allen Längsbereichen der Haube möglich ist.Furthermore, there is the advantage that the temperature difference between supply air and exhaust air, which is of great importance for high efficiency, is of the same order of magnitude in all hood areas along the longitudinal extent of the hood, since a through the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood Supply of not yet heated supply air is possible in all longitudinal areas of the hood.

Insgesamt ergibt sich bei der erfindungsgemäßen Dunstabzugshaube der besondere Vorteil, daß die Anordnung der Wärmetauschelemente quer zur Längsrichtung der Haube größere Anpassungsmöglichkeiten an die durch verschiedene Haubenlängen bedingten Änderungen der Strömungsverhältnisse auf Zuluft- wie auf Abluftseite ergibt, womit wiederum die teilweise ebenfalls von der Haubenlänge und den damit verbundenen Änderungen der zugeführten Zuluftmengen bzw. abgeführten Abluftmengen abhängigen Wärmeübergangsgrößen auf werte eingestellt werden können, die einen optimalen Wirkungsgrad der Dunstabzugshaube ermöglichen.Overall, the extractor hood according to the invention has the particular advantage that the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood offers greater possibilities for adaptation to those caused by different hood lengths Changes in the flow conditions on the supply air and exhaust air side result, which in turn also allows the heat transfer variables, which are also dependent in part on the hood length and the associated changes in the supply air quantities and exhaust air quantities, to be set to values which enable the extractor hood to be optimally efficient.

Die abhängigen Ansprüche haben vorteilhafte weiterbildungen der Erfindung zum Inhalt.The dependent claims contain advantageous developments of the invention.

Gemäß der vorteilhaften Weiterbildung nach Anspruch 2 ist es möglich, eine Mehrzahl von als platten ausgebildeten Wärmetauschelementen zu einem Modul zusammenzufassen, wobei die Plattenabstände zur Erzielung optimaler Strömungs- und Wärmeübertragungsverhältnisse gewählt werden können. Mit einem derartigen Wärmetauschmodul ist es möglich, eine auf Zuluft- und Abluftbasiswerte ausgerichtete Grundeinheit eines für die erfindungsgemäße Dunstabzugshaube besonders geeigneten Wärmetauschers zu schaffen und Hauben unterschiedlicher Länge für unterschiedliche Einsatzfälle mit jeweils verschiedenen Zuluft- und Abluftmengen durch Vorsehen einer entsprechenden Zahl von wärmetauschmodulen an die unterschiedlichen Einsatzbedingungen anzupassen. Damit ist es möglich, eine Art Baukastensystem zu schaffen, bei dem eine Vorfertigung immer gleicher Grundbaueinheiten möglich ist, aus deren Kombination die Herstellung der an den jeweiligen Einsatzzweck angepaßten Dunstabzugshauben möglich ist. Dies wiederum ergibt die Möglichkeit einer Standardisierung der einzelnen Baueinheiten, was insbesondere bei hohen Stückzahlen Rationalisierungseffekte mit entsprechender Herabsetzung der Herstellungskosten zur Folge haben kann.According to the advantageous development according to claim 2, it is possible to combine a plurality of heat exchange elements designed as plates to form a module, the plate spacings being able to be selected in order to achieve optimal flow and heat transfer conditions. With such a heat exchange module, it is possible to create a basic unit of a heat exchanger that is particularly suitable for the extractor hood according to the invention, and hoods of different lengths for different applications with different supply air and exhaust air quantities by providing a corresponding number of heat exchange modules to the different ones Adapt operating conditions. This makes it possible to create a type of modular system in which a prefabrication of the same basic structural units is always possible, from the combination of which it is possible to produce the extractor hoods which are adapted to the respective application. This in turn gives rise to the possibility of standardizing the individual structural units, which can result in rationalization effects with a corresponding reduction in production costs, particularly in the case of large quantities.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus nachfolgender Beschreibung eines Ausführungsbeispieles anhand der Zeichnung.Further details, features and advantages of the invention result from the following description of an embodiment with reference to the drawing.

Die einzige Figur der Zeichnung zeigt in schematisch stark vereinfachter perspektivischer Darstellung einen Mittelbereich einer erfindungsgemäßen Dunstabzugshaube.The single figure of the drawing shows a schematically greatly simplified perspective illustration of a central region of an extractor hood according to the invention.

Bei der in der Fig. dargestellten Ausführungsform der erfindungsgemäßen Dunstabzugshaube 1 wurde aus Übersichtlichkeitsgründen auf die Darstellung konstruktiver Einzelheiten verzichtet, um das für die Wirkungsweise der erfindungsgemäßen Dunstabzugshaube wesentliche Funktionsprinzip besser herausstellen zu können. Weiterhin wurde auf eine maßstabsgetreue Darstellung der Größenverhältnisse insbesondere hinsichtlich der Abmessungen der Wärmetauschelemente und der Abstände zwischen diesen verzichtet, da sowohl die Dicke der Wärmetauschelemente und deren Abstände zueinander bei der in der Fig. dargestellten besonders bevorzugten Ausführungsform der erfindungsgemäßen Dunstabzugshaube 1 im Bereich von wenigen Millimetern liegen, so daß eine maßstabgetreue Darstellung die Übersichtlichkeit der Zeichnung stark herabgesetzt hätte und die Erklärung der Funktionsweise unnötig erschwert worden wäre.In the embodiment of the extractor hood 1 according to the invention shown in FIG. 1, the constructional details have been omitted for reasons of clarity, in order to better emphasize the functional principle essential for the mode of operation of the extractor hood according to the invention. Furthermore, a true-to-scale representation of the size relationships, in particular with regard to the dimensions of the heat exchange elements and the distances between them, has been dispensed with, since both the thickness of the heat exchange elements and their distances from one another in the particularly preferred embodiment of the extractor hood 1 according to the invention shown in the figure are in the range of a few millimeters lie, so that a scale representation would have greatly reduced the clarity of the drawing and the explanation of the operation would have been unnecessarily difficult.

Die erfindungsgsmäße Dunstabzugshaube 1, von der in der Fig. ein Mittelbereich dargestellt ist, ist in nicht näher dargestellter Weise im vorliegenden Beispielsfalle an der Decke einer Küche aufgehängt. Die Haube weist ein Gehäuse 2 auf, in dem ein langgestreckter Saugraum 3 angeordnet ist, der beispielsweise mit einem in der Fig. nicht näher dargestellten Gitter beispielsweise aus Streckmaterial nach unten abgedeckt sein kann. Oberhalb des Saugraumes 3 ist bei der dargestellten Ausführungsform der Haube ein Sammelraum 4 angeordnet, der einen Zuluftvorlageraum 5, einen Zuluftsammelraum 6 und einen Abluftsammelraum 7 aufweist. Bei der dargestellten Ausführungsform sind der Zuluftvorlageraum 5 und der Zuluftsammelraum 6 in je zwei Teilräume 8 und 9 bzw. 10 und 11 unterteilt. Die Teilräume 8 und 9 des Zuluftvorlageraumes 5 und die Teilräume 10 und 11 des Zuluftsammelraumes 6 erstrecken sich wenigstens annähernd über die gesamte Länge der Haube und sind zu beiden Seiten des Abluftsammelraumes 7 entlang der beiden Ränder der Haube angeordnet. Hierbei grenzen die beiden Teilräume 8 und 9 des Zuluftvorlageraumes 5 unmittelbar an den Abluftsammelraum 7 an und sind mittels aufrechter Seitenwände 12 und 13 vom Abluftsammelraum 7 getrennt. Nach außen zu den Rändern der Haube hin grenzen an die Teilräume 8 und 9 des Zuluftvorlageraumes 5 die Teilräume 10 und 11 des Zuluftsammelraumes 6 an, die ebenfalls durch aufrechte Wände 14 und 15 von den Teilräumen 8 und 9 getrennt sind. Die Teilräume 10 und 11 des Zuluftsammelraumes 6 sind über Ausblasöffnungen 16 und 17 in Seitenwänden 18 und 19 mit dem Innenraum der Küche, in der die erfindungsgemäße Dunstabzugshaube 1 angeordnet ist, verbunden. An seiner Oberseite ist der Sammelraum 4 mit einer sich über den Zuluftvorlageraum 5, den Zuluftsammelraum 6 und den Abluftsammelraum 7 erstreckenden Deckenwand 20 abgedeckt.The extractor hood 1 according to the invention, of which a central region is shown in the figure, is suspended from the ceiling of a kitchen in a manner not shown in the present example. The hood has a housing 2, in which an elongated suction space 3 is arranged, which can be covered, for example with a grid, not shown in the figure, for example made of expanded material. In the illustrated embodiment of the hood, a collecting space 4 is arranged above the suction space 3 and has a supply air storage space 5, a supply air collecting space 6 and an exhaust air collecting space 7. In the embodiment shown, the supply air storage space 5 and the supply air collection space 6 are each divided into two subspaces 8 and 9 or 10 and 11. The subspaces 8 and 9 of the supply air storage space 5 and the subspaces 10 and 11 of the supply air collection space 6 extend at least approximately over the entire length of the hood and are arranged on both sides of the exhaust air collection space 7 along the two edges of the hood. Here, the two subspaces 8 and 9 of the supply air storage space 5 directly adjoin the exhaust air collecting space 7 and are separated from the exhaust air collecting space 7 by means of upright side walls 12 and 13. Outwardly towards the edges of the hood, the subspaces 8 and 9 of the supply air storage space 5 adjoin the subspaces 10 and 11 of the supply air plenum 6, which are also separated from the subspaces 8 and 9 by upright walls 14 and 15. The subspaces 10 and 11 of the supply air collecting space 6 are connected to the interior of the kitchen, in which the extractor hood 1 according to the invention is arranged, via outlet openings 16 and 17 in side walls 18 and 19. On its upper side, the collecting space 4 is covered with a ceiling wall 20 which extends over the supply air storage space 5, the supply air collecting space 6 and the exhaust air collecting space 7.

Die Teilräume 8 und 9 des Zuluftvorlageraumes 5 sind mit zwei Verteilerkanälen 21 und 22 verbunden, die in einem zentralen Zuluftkanal 23 münden. Der Zuluftkanal 23 ist in nicht näher dargestellter Weise mit der Umgebung verbunden und fördert Zuluft in den Zuluftvorlageraum 5.The subspaces 8 and 9 of the supply air supply space 5 are connected to two distributor ducts 21 and 22 which open into a central supply air duct 23. The supply air duct 23 is connected to the environment in a manner not shown in detail and conveys supply air into the supply air supply space 5.

Der Abluftsammelraum 7 ist über einen Abluftanschluß 24 mit einem Abluftkanal 25 verbunden, der die aus der Küche abgesaugte Abluft in die Umgebung ableitet.The exhaust air collecting space 7 is connected via an exhaust air connection 24 to an exhaust air duct 25 which discharges the exhaust air extracted from the kitchen into the environment.

Im Saugraum 3 des Gehäuses 2 der Dunstabzugshaube 1 sind quer zur Längsrichtung der Haube Wärmetauschelemente 26 angeordnet. Die Wärmetauschelemente 26, die im Beispielsfalle als im wesentlichen trapezförmige Platten aus einem für einen guten Wärmeübergang besonders geeigneten Material wie beispielsweise Kupfer oder Aluminium ausgebildet sind, sind im Abstand von wenigen Millimetern zueinander angeordnet, wo ein besonders bevorzugter Abstand ungefähr 5 mm beträgt. Die Abstände zwischen den als Platten ausgebildeten Wärmetauschelementen 26 werden mittels eines Abstandshalters 27 festgelegt, wobei zwischen zwei Wärmetauschelementen 26 jeweils Strömungskanäle 28 bzw. 29 gebildet werden, die zur Führung von Abluft bzw. Zuluft dienen. Bei der dargestellten Ausführungsform der erfindungsgemäßen Dunstabzugshaube 1 begrenzen die in der Fig. vorderen beiden Platten 26 einen Strömungskanal 28 für Abluft, wobei die gemäß der gewählten Darstellung an die Unterseite des Sammelraumes 4 angrenzende Fläche 30 zwischen den Wärmetauschelementen 26 mittels des Abstandshalters 27 teilweise zur Bildung einer Durchtritts-Öffnung 31 für Abluft abgedeckt ist.In the suction chamber 3 of the housing 2 of the extractor hood 1, heat exchange elements 26 are arranged transversely to the longitudinal direction of the hood. The heat exchange elements 26, which in the example are essentially trapezoidal plates made of a material such as copper or aluminum, which is particularly suitable for good heat transfer are arranged at a distance of a few millimeters from one another, where a particularly preferred distance is approximately 5 mm. The distances between the heat exchange elements 26 designed as plates are determined by means of a spacer 27, flow channels 28 and 29 being formed between two heat exchange elements 26, which are used to guide the exhaust air or supply air. In the illustrated embodiment of the extractor hood 1 according to the invention, the two plates 26 in the front limit a flow channel 28 for exhaust air, the surface 30 adjacent to the underside of the collecting space 4 between the heat exchange elements 26 by means of the spacer 27 being formed in part, as shown a passage opening 31 for exhaust air is covered.

An den Strömungskanal 28 grenzt unmittelbar ein Strömungskanal 29 an, der wiederum von zwei als Platten ausgebildeten Wärmetauschelementen 26 begrenzt ist und für die Führung von Zuluft vorgesehen ist. Die an die Unterseite des Sammelraumes 4 angrenzende, von den Platten 26 des Strömungskanales 29 begrenzte horizontale Fläche 32 ist mittels des Abstandshalters 27 zur Bildung je einer Eintritts- und Austritts-Öffnung 33 bzw. 34 für Zuluft teilweise abgedeckt, während die gemäß der gewählten Darstellung nach unten weisenden, von den Platten 26 des Strömungskanales 29 begrenzten Flächen 35, 36 und 37 mittels des Abstandshalters 27 vollständig abgedeckt sind.A flow channel 29 directly adjoins the flow channel 28, which in turn is delimited by two heat exchange elements 26 designed as plates and is provided for guiding supply air. The horizontal surface 32 bordering on the underside of the collecting space 4, delimited by the plates 26 of the flow channel 29, is partially covered by the spacer 27 to form an inlet and outlet opening 33 and 34 for supply air, respectively, while that according to the selected representation downward-facing surfaces 35, 36 and 37 delimited by the plates 26 of the flow channel 29 are completely covered by the spacer 27.

Alle Strömungskanäle 28 und 29 für Abluft bzw. Zuluft der mittels des Abstandshalters 27 zu einem Wärmetauschmodul zusammengefaßten als Platten ausgebildeten Wärmetauschelementen 26 sind in der zuvor beschriebenen Weise ausgebildet, so daß entlang der Längsrichtung des Gehäuses 2 der Haube jeweils abwechselnd nebeneinander ein Strömungskanal 28 für Abluft und ein Strömungskanal 29 für Zuluft in unmittelbarer Nachbarschaft zueinander angeordnet sind, wobei die Wärmetauschelemente 26 quer zur Längsrichtung der Haube angeordnet sind. Die durch die teilweise Abdeckung der an die Unterseite des Sammelraumes 4 angrenzenden Flächen 30 entstehenden Durchtrittsöffnungen 31 für Abluft sind mit dem Abluftsammelraum 7 verbunden, während die Eintrittsöffnungen 33 der Strömungskanäle 29 für Zuluft mit den Teilräumen 8 und 9 des Zuluftvorlageraumes 5 und die Austrittsöffnungen 34 mit den Teilräumen 10 und 11 des Zuluftsammelraumes 6 verbunden sind.All flow channels 28 and 29 for exhaust air or supply air of the heat exchanger elements 26, which are combined as plates by means of the spacer 27 to form a heat exchange module, are designed in the manner described above, so that along the longitudinal direction of the housing 2 of the hood, a flow channel 28 for exhaust air alternately side by side and a flow channel 29 for supply air are arranged in the immediate vicinity of one another, the heat exchange elements 26 being arranged transversely to the longitudinal direction of the hood. The through openings 31 for exhaust air which are formed by the partial covering of the surfaces 30 adjoining the underside of the collecting space 4 are connected to the exhaust air collecting space 7, while the inlet openings 33 of the flow channels 29 for supply air are connected to the subspaces 8 and 9 of the supply air storage space 5 and the outlet openings 34 the subspaces 10 and 11 of the supply air plenum 6 are connected.

Unterhalb der Wärmetauschelemente 26 sind über die gesamte Länge der Haube sich erstreckende Filter 38 und 39 vorgesehen, die in schräger Anordnung in der Haube aufgehängt sind, und deren untere Enden in einer horizontal in der Haube angeordneten Fangfläche 40 angeordnet sind. Die Filter 38 und 39 sind luftdurchlässig, so daß die vom Herd von unten nach oben angesaugte Abluft die Filter 38 und 39 durchdringen kann. Andererseits fangen die Filter 38 und 39 durch Kondensationswirkung beim Wärmeübergang von der Abluft auf die Zuluft ausfallendes Kondenzwasser und ausfallende flüssige Fettpartikel auf und leiten diese in die Fangfläche 40 ab.Provided underneath the heat exchange elements 26 are filters 38 and 39 which extend over the entire length of the hood and are suspended in the hood in an oblique arrangement, and whose lower ends are arranged in a catch surface 40 arranged horizontally in the hood. The filters 38 and 39 are permeable to air, so that the exhaust air sucked in from the stove upwards can penetrate the filters 38 and 39. On the other hand, the filters 38 and 39 catch condensation water and liquid fat particles which precipitate out as a result of the condensation effect during the heat transfer from the exhaust air to the supply air and discharge them into the collecting surface 40.

Im Betrieb der erfindungsgemäßen Dunstabzugshaube 1 wird beispielsweise mittels eines nicht näher dargestellten Gebläses warme Abluft vom Herd von unten nach oben in das Gehäuse 2 angesaugt und durch die Filter 38 und 39 hindurch in die Strömungskanäle 38 für Abluft gefördert. Zugleich wird über den Zuluftkanal 23 Zuluft in die Verteilerkanäle 21 und 22 gefördert, die die Zuluft in die Teilräume 8 und 9 des Zuluftvorlageraumes 5 fördern. Vom Zuluftvorlageraum 5 wird die Zuluft über die Eintrittsöffnungen 33 in die Strömungskanäle 29 für Zuluft gefördert, wobei bei der dargestellten Ausführungsform die Eintrittsöffnungen 33 jeweils wechselseitig entlang der Längsrichtung des Gehäuses 2 Zuluft über die im Teilraum 8 angeordneten Eintrittsöffnungen 33 und im Teilraum 9 angeordneten Eintrittsöffnungen 33 in die Strömungskanäle 29 führen. Entsprechend tritt die durch den Wärmeübergang zwischen der Abluft und der Zuluft erwärmte Zuluft wechselweise über die Austrittsöffnungen 34 in den Teilräumen 10 bzw. 11 in diese aus, wonach die erwärmte Zuluft über die Ausblasöffnungen 16 bzw. 17 in den Innenraum der Küche wenigstens annähernd deckenparallel zur Erzeugung einer Raumluftwalze ausgeblasen werden.In the operation of the extractor hood 1 according to the invention, warm exhaust air is sucked in from the stove upwards into the housing 2, for example by means of a blower, not shown, and is conveyed through the filters 38 and 39 into the flow channels 38 for exhaust air. At the same time, supply air is conveyed via the supply air duct 23 into the distribution ducts 21 and 22, which convey the supply air into the subspaces 8 and 9 of the supply air supply space 5. From the supply air supply space 5, the supply air is conveyed via the inlet openings 33 into the flow channels 29 for supply air, with the inlet openings 33 in the illustrated embodiment alternatingly along the longitudinal direction of the housing 2, supply air via the inlet openings 33 arranged in the partial space 8 and in the partial space 9 lead into the flow channels 29. Correspondingly, the supply air heated by the heat transfer between the exhaust air and the supply air alternately exits through the outlet openings 34 in the subspaces 10 and 11, after which the heated supply air via the exhaust openings 16 and 17 into the interior of the kitchen at least approximately parallel to the ceiling Generation of a room air roller to be blown out.

Die bei der dargestellten Ausführungsform gewählte wechselweise Anordnung der Eintrittsöffnungen 33 bzw. der Austrittsöffnungen 34 ist erforderlich, um eine Haube zu erhalten, die an ihren beiden Längsseiten erwärmte Zuluft in den Innenraum ausblasen kann, wozu eine Anordnung der Teilräume 10 und 11 in unmittelbarer Nachbarschaft der Längsränder der Haube erforderlich ist. Für eine Haube, die nur auf einer Seite Zuluft ausbläst, ist eine Unterteilung in jeweils zwei Teilräume 8 und 9 bzw. 10 und 11 des Zuluftvorlageraumes 5 bzw. des Zuluftsammelraumes 6 nicht erforderlich, so daß für eine derartige Haube beispielsweise der Teilraum 8 und der Teilraum 10 des Zuluftvorlageraumes 5 bzw. des Zuluftsammelraumes 6 zu einem Zuluftvorlageraum zusammengefaßt werden könnten, wobei dann die Austrittsöffnungen 34 Eintrittsöffnungen 33 bilden würden, die die zu erwärmende Zuluft in den Zuluftvorlageraum 5, der dann von den Teilräumen 9 und 11 gebildet würde, fördern könnten, wobei in diesem Zuluftvorlageraum dann jede Eintrittsöffnung 33 eine Austrittsöffnung 34 für Zuluft bilden würde.The alternate arrangement of the inlet openings 33 and the outlet openings 34 selected in the illustrated embodiment is necessary in order to obtain a hood that can blow heated supply air into the interior on its two longitudinal sides, for which purpose an arrangement of the subspaces 10 and 11 in the immediate vicinity of the Longitudinal edges of the hood is required. For a hood that blows supply air only on one side, a subdivision into two subspaces 8 and 9 or 10 and 11 of the supply air supply space 5 or the supply air collection space 6 is not necessary, so that for such a hood, for example, the subspace 8 and the Partial space 10 of the supply air storage space 5 or the supply air collection space 6 could be combined to form a supply air storage space, in which case the outlet openings 34 would form inlet openings 33 which could promote the supply air to be heated into the supply air storage space 5, which would then be formed by the part spaces 9 and 11 , in which case each inlet opening 33 would form an outlet opening 34 for supply air in this supply air storage space.

Bei der dargestellten Ausführungsform der erfindungsgemäßen Dunstabzugshaube jedoch wird wie zuvor beschrieben die Zuluft jeweils wechselweise über die in den Teilräumen 8 und 9 des Zuluftvorlageraumes 5 über die Eintrittsöffnungen 33 in die Strömungskanäle 29 eingeleitet und nach Erwärmung durch die warme Abluft über die Austrittsöffnungen 34 in die Teilräume 10 und 11 des Zuluftsammelraumes 6 eingeleitet, so daß ein Ausblasen von erwärmter Zuluft über die Ausblasöffnungen 16 bzw. 17 in beide Richtungen möglich ist.In the illustrated embodiment of the extractor hood according to the invention, however, as described above, the supply air is alternately introduced into the flow channels 29 via the inlet openings 33 in the subspaces 8 and 9 of the supply air supply space 5 and after heating by the warm one Exhaust air is introduced via the outlet openings 34 into the subspaces 10 and 11 of the supply air collecting space 6, so that it is possible to blow out heated supply air in both directions via the outlet openings 16 and 17.

Die Abluft wird über die Strömungskanäle 28 und die Durchtrittsöffnungen 31 in den Abluftsammelraum 7 eingeleitet, von dem aus die Abluft über den Abluftanschluß 24 in den Abluftkanal 25 und von dort aus in die Umgebung abgeleitet wird. Die Anordnung der Wärmetauschelemente 26 quer zur Längsrichtung der Haube ergibt den Vorteil, daß je nach Länge der Haube und der daraus resultierenden Zuluft-und Abluftmengen eine entsprechende Zahl von Wärmetauschelementen 26 und eine daraus sich ergebende Zahl von Strömungskanälen 28 und 29 für Ab- und Zuluft gewählt werden kann, die optimale Strömungs- und Wärmeübertragungsverhältnisse ermöglicht. Insbesondere bei der Anordnung der Wärmetauschelemente in Form von Wärmetauschmodulen, wie sie bei dem dargestellten Ausführungsbeispiel der Haube verwendet sind, ist es auf einfache Weise möglich, vor der eigentlichen Herstellung der erfindungsgemäßen Dunstabzugshaube 1 die für optimale Strömungs- und Wärmeübertragungsverhältnisse besonders geeigneten Querschnittsflächen der Strömungskanäle 28 und 29 zu bestimmen und bei der Herstellung der Wärmetauschmodulen festzulegen. Mit einer derartigen Basiseinheit können dann unterschiedlich lange Hauben für unterschiedliche Einsatzzwecke hergestellt werden, wobei entsprechend den zu erwartenden Abluft- und Zuluftmengen eine geeignete Anzahl von Wärmetauschmodulen vorgesehen werden können, um die optimalen Strömungs- und Wärmeübertragungsverhältnisse zu erreichen, die einen optimalen Wirkungsgrad der Dunstabzugshaube 1 ermöglicht. Dies bedeutet also, daß für eine lange Haube eine entsprechend große Anzahl Wärmetauschelemente 26 beispielsweise in Form der genannten Wärmeaustauschmodulen in der Haube vorgesehen wird, so daß sich die zur Förderung der entsprechend der Länge der Haube großen Menge von Zuluft und Abluft erforderliche Querschnittsfläche der Strömungskanäle 28 und 29 auf einen Wert erhöhen läßt, der die Einhaltung der zuvor bestimmten optimalen Strömungs und Wärmeübergangsverhältnisse ermöglieht. Vor allem können mit der erfindungsgemäßen Dunstabzugshaube 1 die Strömungsverluste durch entsprechend große Strömungsquerschnitte und relativ kurze Strömungswege minimiert werden und es ist möglich, die für einen guten Wärmeübergang erforderlichen Wärmeübergangskoeffizienten durch entsprechende Anordnung der Wärmetauschelemente 26 einzustellen. Damit können bei der erfindungsgemäßen Dunstabzugshaube 1 hohe Wirkungsgrade erreicht werden, so daß sogar auf das Vorsehen einer Nachwärmeinrichtung für die Zuluft verzichtet werden kann, falls die Temperaturen, mit der die Zuluft angesaugt wird, nicht extrem niedrig sind. Anderenfalls ist es selbstverständlich möglich, bei der der erfindungsgemäßen Dunstabzugshaube 1 für extreme Temperaturen der Zuluft Nachwärmeinrichtungen vorzusehen.The exhaust air is introduced via the flow channels 28 and the passage openings 31 into the exhaust air collecting space 7, from which the exhaust air is discharged via the exhaust air connection 24 into the exhaust air channel 25 and from there into the environment. The arrangement of the heat exchange elements 26 transversely to the longitudinal direction of the hood gives the advantage that, depending on the length of the hood and the resulting supply air and exhaust air quantities, a corresponding number of heat exchange elements 26 and a resulting number of flow channels 28 and 29 for exhaust and supply air can be selected that enables optimal flow and heat transfer conditions. In particular in the arrangement of the heat exchange elements in the form of heat exchange modules, such as are used in the illustrated embodiment of the hood, it is possible in a simple manner before the actual manufacture of the extractor hood 1 according to the invention, the cross-sectional areas of the flow channels 28 that are particularly suitable for optimal flow and heat transfer conditions and 29 to be determined and determined in the manufacture of the heat exchange modules. Such a base unit can then be used to produce hoods of different lengths for different purposes, with a suitable number of heat exchange modules being able to be provided in accordance with the amounts of exhaust air and supply air to be expected, in order to achieve the optimum flow and heat transfer conditions which achieve optimum efficiency of the extractor hood 1 enables. This means that, for a long hood, a correspondingly large number of heat exchange elements 26 is provided in the hood, for example in the form of the aforementioned heat exchange modules, so that the cross-sectional area of the flow channels 28 required to promote the large amount of supply air and exhaust air corresponding to the length of the hood increases and 29 can be increased to a value which enables compliance with the previously determined optimal flow and heat transfer conditions. Above all, with the extractor hood 1 according to the invention, the flow losses can be minimized by correspondingly large flow cross sections and relatively short flow paths, and it is possible to set the heat transfer coefficients required for good heat transfer by arranging the heat exchange elements 26 accordingly. High efficiencies can thus be achieved in the extractor hood 1 according to the invention, so that there is even no need for a reheating device for the supply air if the temperatures at which the supply air is drawn in are not extremely low. Otherwise it is of course possible to provide reheating devices for the extractor hood 1 according to the invention for extreme temperatures of the supply air.

Darüber hinaus ist es möglich. die erfindungsgemäßen Dunstabzugshaube 1 als Teil einer Hängedecke auszubilden, bei der dann die Seitenwände 18 und 19 mit den Ausblasöffnungen 16 und 17 im Ein hauzustand nach unten geneigt angeordnet sind, so daß sich beim Zusammenfügen mehrerer Dunstabzugshauben 1 entlang deren Längsrändern zu einer Hängedecke dachartige Verbindungsbereiche in Form der zusammengefügten Seitenwände 18 und 19 der jeweiligen Dunstabzugshauben 1 bilden lassen.It is also possible. to design the extractor hood 1 according to the invention as part of a suspended ceiling, in which case the side walls 18 and 19 with the blow-out openings 16 and 17 are arranged inclined downward in a hewing state, so that roof-like connecting areas in when a plurality of extractor hoods 1 are joined together along their longitudinal edges to form a suspended ceiling Let form the joined side walls 18 and 19 of the respective extractor hoods 1.

Als besonderer Vorteil der erfindungsgemäßen Dunstabzugshaube läßt sich abschließend festhalten, daß sich die für einen hohen Wirkungsgrad beim Wärmeaustausch zwischen Abluft und Zuluft besonders bedeutungsvolle Wärmetauschfläche durch die Anordnung der Wärmetauschelemente quer zur Längsrichtung der Haube gegenüber bekannten Hauben noch wesentlich erhöhen läßt, womit bei der erfindungsgemäßen Dunstabzugshaube 1 ein besonders hoher wirkungsgrad erreicht werden kann. So wurden bei Hauben der erfindungsgemäßen Ausbildung Wirkungsgrade zwischen 70 und 80 % ermittelt, wobei sich bei der Ausbildung der Wärmetauschelemente 26 als Platten Plattendicken von ungefähr 0,3 mm und Plattenabstände von 5 mm als besonders vorteilhaft erwiesen haben. Hierbei ergaben sich als weitere Vorteile, daß aufgrund der günstigen Anströmverhältnisse aufgrund der Anordnung der Wärmetauschelemente 26 im Saugraum 3 sowie der vorteilhaften Ausbildung der Strömungskanäle 28 und 29 sowohl bezüglich deren Querschnittsfläche als auch deren Länge die Gebläseleistungen zur Förderung von Abluft und von Zuluft, falls für diese eine Gebläse verwendet wird, niedriger sein können als bei bekannten Hauben. Weiterhin ergibt sich aufgrund des hohen Wirkungsgrades eine sehr hohe Kondensatbildung und damit eine sehr hohe Fettabscheidung aus der abgesaugten Abluft, wobei bei einer Haube der erfindungsgemäßen Ausbildung ermittelt wurde, daß der Fettabscheidungsgrad derart hoch sein kann, daß auf zusätzliche Maßnahmen zur Vermeidung von Bränden und Explosionen verzichtet werden kann.As a particular advantage of the extractor hood according to the invention, it can finally be stated that the heat exchange surface, which is particularly important for a high degree of efficiency in the heat exchange between exhaust air and supply air, can be significantly increased compared to known hoods by the arrangement of the heat exchange elements transversely to the longitudinal direction of the hood, which means with the extractor hood according to the invention 1 a particularly high degree of efficiency can be achieved. Efficiencies of between 70 and 80% were determined in the case of hoods of the design according to the invention, with plate thicknesses of approximately 0.3 mm and plate spacing of 5 mm having proven particularly advantageous when designing the heat exchange elements 26. This resulted in further advantages that due to the favorable inflow conditions due to the arrangement of the heat exchange elements 26 in the suction chamber 3 and the advantageous design of the flow channels 28 and 29, both in terms of their cross-sectional area and their length, the blower performance for conveying exhaust air and supply air, if for that a blower is used, may be lower than with known hoods. Furthermore, due to the high efficiency, there is a very high formation of condensate and thus a very high fat separation from the extracted exhaust air, it being determined with a hood of the design according to the invention that the degree of fat separation can be so high that additional measures to avoid fires and explosions can be taken can be dispensed with.

Ein weiterer besonderer Vorteil der erfindungsgemäßen Dunstabzugshaube 1 ist darin zu sehen, daß der hohe Wirkungsgrad über die gesamte Haubenlänge konstant gehalten werden kann, da durch die quer zur Längsrichtung der Haube angeordneten Wärmetauschelemente 26 über die gesamte Länge der Haube die hohe Temperaturdifferenz zwischen Zuluft und Abluft, die für einen hohen Wirkungsgrad von besonderer Bedeutung ist, erhalten bleibt.Another particular advantage of the extractor hood 1 according to the invention can be seen in the fact that the high efficiency can be kept constant over the entire hood length, since the high temperature difference between supply air and exhaust air over the entire length of the hood through the heat exchange elements 26 arranged transversely to the longitudinal direction of the hood , which is of particular importance for high efficiency, is retained.

Claims (12)

1. Fume hood with an elongate extraction chamber, with an exit air connection for discharging extracted exit air and with a fresh air supply chamber and a fresh air collection chamber, between which heat exchange elements, through which fresh air can flow, of a recuperator are arranged which is provided in the extraction chamber of the hood and around which the exit air flows, characterized in that the fresh air supply chamber (5) and the fresh air collection chamber (6) are arranged in the region of the top side of the extraction chamber (3) each along one edge of the hood and extend over at least approximately the entire length of the hood, and that the heat exchange elements (26) are arranged transversely to the longitudinal direction of the hood.
2. Fume hood according to Claim 1, characterized in that the heat exchange elements (26) are constructed as plates which are combined into heat exchange modules.
3. Fume hood according to Claim 2, characterized in that the spacings between the plates of the modules are fixed by means of at least one spacer (27) in order to form flow channels (28, 29), one flow channel (28) for exit air always being arranged alternately in the immediate vicinity of a flow channel (29) for fresh air.
4. Fume hood according to Claim 3, characterized in that the surface (30) which, in the installed state of the hood, is located horizontally in the region of the top side of the extraction chamber (3) and is bounded by two plates for forming a flow channel (28) for exit air, is partially covered by means of the spacer (27) for forming a passage opening (31).
5. Fume hood according to Claim 3 or 4, characterized in that the surface (32) which, in the installed state of the hood, is located in the region of the top side of the extraction chamber (3) and is bounded by two plates for forming a flow channel (29) for fresh air, is partially covered by means of the spacer (27) for forming at least one inlet opening (33) and at least one outlet opening (34) for fresh air, whereas the surface (35, 36, 37), pointing downwards in the installed state of the hood, is completely covered between two plates by means of the spacer (27) for forming a flow channel (29) for fresh air.
6. Fume hood according to one of Claims 1 to 5, characterized in that, in the installed state of the hood, at least one collection chamber (4), in which the fresh air supply chamber (5), the fresh air collection chamber (6) and an exit air collection chamber (7) are arranged, is provided above the heat exchange elements (26).
7. Fume hood according to Claim 6, characterized in that the passage openings (31) for exit air lead into the exit air collection chamber (7) which is connected to the exit air connection (24).
8. Fume hood according to one of Claims 1 to 7, characterized in that the fresh air supply chamber (5) and the fresh air collection chamber (6) are each divided into two part chambers (8, 9 and 10, 11 respectively) which are arranged on either side of the exit air collection chamber (7), the part chambers (10, 11) of the fresh air collection chamber (6) being arranged along the longitudinal edges of the hood and in the immediate vicinity thereof.
9. Fume hood according to Claim 8, characterized in that the inlet openings (33) and the outlet openings (34) for fresh air each lead alternately, along the longitudinal extent of the hood, into one of the two part chambers (8, 9 or 10, 11) of the fresh air supply chamber (5) or the fresh air collection chamber (6) respectively.
10. Fume hood according to one of Claims 1 to 9, characterized in that a number, depending on the length of the hood, of heat exchange modules is provided.
11. Fume hood according to one of Claims 2 to 10, characterized in that the plates of the heat exchange modules have a thickness of 0.3 mm.
12. fume hood according to one of Claims 1 to 11, characterized in that the spacing between the heat exchange elements (26) is a few millimetres, preferably 5 mm.
EP84102732A 1983-03-15 1984-03-13 Smoke extracting hood Expired EP0121809B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84102732T ATE21448T1 (en) 1983-03-15 1984-03-13 COOKER HOOD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833309208 DE3309208A1 (en) 1983-03-15 1983-03-15 COOKER HOOD
DE3309208 1983-03-15

Publications (2)

Publication Number Publication Date
EP0121809A1 EP0121809A1 (en) 1984-10-17
EP0121809B1 true EP0121809B1 (en) 1986-08-13

Family

ID=6193511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102732A Expired EP0121809B1 (en) 1983-03-15 1984-03-13 Smoke extracting hood

Country Status (6)

Country Link
EP (1) EP0121809B1 (en)
AT (1) ATE21448T1 (en)
DE (2) DE3309208A1 (en)
DK (1) DK153436C (en)
IE (1) IE55587B1 (en)
NO (1) NO161774C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7041159B2 (en) 2003-08-04 2006-05-09 Phillips Plastics Corporation Separation apparatus
AU2002240514A1 (en) 2001-03-01 2002-09-19 Phillips Plastics Corporation Filtration media of porous inorganic particles
US6543526B2 (en) 2001-06-01 2003-04-08 Sidney Jacobs Combination cook stove heat exchanger, filter, and recirculation assembly
US7166140B2 (en) 2003-10-22 2007-01-23 Phillips Plastics Corporation High capture efficiency baffle
CN103574721B (en) * 2013-10-29 2016-07-06 九阳股份有限公司 A kind of side-suction type range hood
AT514933B1 (en) * 2013-11-22 2015-05-15 Scheuch Gmbh suction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2362677A1 (en) * 1976-08-27 1978-03-24 Electricite De France Kitchen ventilating and filtering hood - forms ascending zigzag extraction path around cooling unit and has collector tray at front
US4175614A (en) * 1978-06-01 1979-11-27 Modine Manufacturing Company Heat exchanger device
DE8307495U1 (en) * 1983-03-15 1983-07-14 Schmalhofer, Markus, 8350 Plattling COOKER HOOD

Also Published As

Publication number Publication date
DK153436C (en) 1988-12-12
DK153436B (en) 1988-07-18
DK136484D0 (en) 1984-02-29
IE840607L (en) 1984-09-15
EP0121809A1 (en) 1984-10-17
NO161774B (en) 1989-06-19
NO161774C (en) 1989-09-27
ATE21448T1 (en) 1986-08-15
IE55587B1 (en) 1990-11-07
DE3460458D1 (en) 1986-09-18
NO840946L (en) 1984-09-17
DK136484A (en) 1984-09-16
DE3309208A1 (en) 1984-09-20

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