COMMERCIAL DISHWASHING MACHINE AND METHOD FOR OPERATING SUCH A

Description

[0001] The present invention relates to a commercial dishwasher and a method for operating such a commercial dishwasher. Such commercial dishwashers comprise a washing chamber into which dishes to be washed can be placed, and one or more dispensing devices for dispensing a treatment liquid or several different treatment liquids.

[0002] Such commercial dishwashers typically operate with very short cycles, and a large number of cycles occur per day. Each cycle often comprises one or more operating cycles or modes, particularly a wash cycle, a rinse cycle, and / or a drying cycle.

[0003] After each wash cycle, the dishwasher door is opened and the clean dishes can be removed. However, opening a commercial dishwasher after a cycle to remove the dishes causes the steam or fumes generated during the cycle to escape into the surrounding area. This creates a warm, humid environment in the dishwasher's workspace, especially when numerous cycles are performed in a short period. Furthermore, it is unpleasant for the operator to be exposed to the hot steam when opening the door, and for those who wear glasses, this can cause them to fog up.

[0004] To mitigate this negative effect, EP 1 355 560 B1 proposes a commercial dishwasher with a heat exchanger or dehumidifier, wherein the dishwasher is designed to include a device for generating an airflow that circulates in a closed air circuit, so that the moist air can be extracted from the washing chamber and reintroduced into the washing chamber, wherein the heat exchanger or dehumidifier is provided in the air circuit.

[0005] A dishwasher according to the preamble of claim 1 is known from DE 1957 004 U, similar relevant dishwashers are also known from DE 1255 254 A. and DE 35 13 639 A1.

[0006] It is an object of the present invention to improve a commercial dishwasher with a washing chamber, in particular a program-controlled dishwasher, and in particular to keep the escape of water vapor or fumes into the environment and their negative effects at a low level or even to avoid them.

[0007] This problem is solved by a commercial dishwasher according to claim 1 and a method according to claim 10. Claims 2 to 9 relate to particularly preferred embodiments of the dishwasher according to the invention.

[0008] A commercial dishwasher according to the invention comprises a washing chamber in which at least one first dispensing device for dispensing a treatment liquid is arranged.

[0009] The treatment fluid can be of various types, such as a washing or cleaning fluid. In particular, the treatment fluid can also be a rinsing fluid.

[0010] The washing-up area is bounded by one or more interior walls. These typically consist of two side walls and a back wall, with a fourth side being defined by a door and an associated interior wall. The washing-up area is typically bounded at the top by a ceiling wall and at the bottom by a floor and / or a tank or similar elements. However, other shapes and boundaries for a washing-up area are also conceivable.

[0011] According to the invention, the dishwasher is designed to be operable in at least two operating modes, wherein the dishwasher comprises a control device designed to be able to switch the dishwasher into an operating mode selected by a user or a mode predetermined according to a washing program and to control the operation of the dishwasher, wherein the at least two operating modes comprise at least one dish treatment mode and at least one steam reduction mode.

[0012] According to the invention, the dishwasher further comprises at least a second dispensing device for dispensing a steam reduction fluid, which is arranged in the wash chamber in such a way that it can dispense the steam reduction fluid directly and / or indirectly at least onto a partial area of ​​at least one of the inner walls of the wash chamber when the dishwasher is in a steam reduction mode.

[0013] By activating the steam reduction mode, in which a steam reduction fluid, typically water, preferably at temperatures between, for example, 10 °C and 40 °C, is dispensed, the water vapor in the wash chamber is cooled and thereby condensed. The cooling occurs through two effects which, as the inventor has determined, are particularly effective in combination: firstly, direct cooling of the steam or water vapor within the wash chamber through direct contact between the steam reduction fluid dispensed by the second dispensing device and the water vapor or steam; and secondly, cooling of an inner wall of the wash chamber by directly dispensing the steam reduction fluid onto at least a portion of at least one inner wall, so that the condensation of the steam or water vapor is intensified by cooling the inner wall over a large area.

[0014] The inventor has determined that such a dishwasher according to the invention achieves a very extensive and effective reduction or even destruction of steam without the need to provide a complex and also expensive heat recovery system with a heat exchanger, as is the case in the prior art.

[0015] This provides a cost-effective, less fault-prone and less space-consuming dishwasher that offers at least comparable and in some cases even better effects in terms of steam reduction than more complex and expensive dishwashers with heat recovery systems.

[0016] Furthermore, it has also been shown that the time required for the desired reduction or even complete elimination of water vapor can be shorter than with systems using a heat recovery system.

[0017] At the same time, a safe and user-friendly operation is achieved, which also enables operation by less well-trained personnel. Furthermore, such a dishwasher according to the invention requires significantly less maintenance than dishwashers with heat recovery systems, which also considerably reduces follow-up and operating costs.

[0018] Preferably, the intensity of the steam reduction can be easily selected or adjusted, for example, by choosing the temperature of the steam reduction fluid, optionally achieved or supported by upstream cooling, if necessary or advantageous, by designing the size of the second dispensing device, and / or optionally by providing several second dispensing devices. If several second dispensing devices are provided, they can preferably be installed in different positions, for example, on one or more side walls of the machine's wash chamber and / or on the rear wall of the machine's wash chamber.

[0019] The steam reduction fluid can either be dispensed directly onto at least a portion of at least one of the inner walls of the wash chamber, or it is possible for the steam reduction fluid to be dispensed indirectly onto a portion of at least one of the inner walls, preferably from the second dispensing device first onto a deflecting element, for example a deflecting plate, and from there onto a portion of an inner wall. Such indirect dispensing opens up further possibilities for the targeted dispensing of steam reduction fluid onto desired portions of the inner walls of the wash chamber.

[0020] In a particularly preferred embodiment, the dishwasher includes a dishwasher door that can be opened to access the wash chamber and remove the washed items. Preferably, this dishwasher door is located, for example, on the front of the dishwasher and can preferably be rotated about a rotation axis, which is preferably located in a lower area of ​​the dishwasher, so that the wash chamber is easily accessible to the user.

[0021] According to a particularly preferred embodiment, a second dispensing device for dispensing a steam reduction fluid is arranged in the wash chamber such that it is able to dispense the steam reduction fluid directly and / or indirectly, at least onto a portion of the inner wall of the dishwasher door when the door is in its closed position. This has the particular advantage that the steam reduction effect is generated especially in the area where any remaining steam from the wash chamber could escape and be released into the environment.

[0022] Furthermore, a second dispensing device is preferably designed to dispense a vapor reduction fluid onto at least 30%, preferably at least 50% and particularly preferably at least 80% of the total surface area of ​​the inner wall of the dishwasher door.

[0023] Control of the emission characteristics is achieved in particular by selecting the emission elements of the dispensing device, especially nozzles, and in particular also by their arrangement and by choosing the desired emission cones, i.e. the areas in which vapor reduction fluid is emitted by the individual emission elements of the second dispensing device.

[0024] In a further particular embodiment, at least a second dispensing device is arranged in such a way that it is able to dispense a vapor reduction liquid directly and / or indirectly onto at least 30% of the total surface area of ​​at least one inner wall of the washing chamber or dishwasher, preferably onto at least 50% of the total surface area of ​​at least one inner wall of the washing chamber or dishwasher, and particularly preferably onto at least 80% of the total surface area of ​​at least one inner wall of the washing chamber or dishwasher.

[0025] In a further particular embodiment, at least one second dispensing device, and in particular several second dispensing devices for dispensing a steam reduction fluid, are arranged in the wash chamber such that they are able to dispense a steam reduction fluid directly and / or indirectly onto at least 30%, preferably at least 50%, and particularly preferably at least 80% of the total surface area of ​​two or three inner walls of the wash chamber. These may preferably be two lateral inner walls, but more preferably also in combination with dispensing the steam reduction fluid onto the inner wall of the dishwasher door and / or onto the rear of the wash chamber.

[0026] This results in particularly effective steam reduction in various areas of the wash chamber. The effectiveness of the steam reduction is thereby increased, which also reduces the duration of the steam reduction fluid dispensing and thus the duration of the steam reduction mode.

[0027] In a preferred embodiment, the dishwasher is designed such that the dispensing of a steam reduction liquid by one, preferably by all second, dispensing devices for dispensing a steam reduction liquid is interrupted as soon as the washing chamber is opened, in particular by a dishwasher door.

[0028] This has the advantage that even if the dishwasher's interior is opened by a user before the cycle is complete, particularly in steam reduction mode, the dispensing of steam reduction fluid is interrupted. In particular, if a second dispensing device for steam reduction fluid is located near the dishwasher door, as is the case in a particularly preferred embodiment, this prevents steam reduction fluid from escaping through the open dishwasher door.

[0029] In a particularly preferred embodiment, it is also possible to switch off only one of the secondary dispensing devices immediately when the dishwasher door is opened, in particular a dispensing device located near the dishwasher door to prevent the escape of steam reduction fluid, while other secondary dispensing devices located on the side walls or rear wall of the wash chamber are switched off only after a predetermined time delay, for example, after 3 to 5 seconds. This, in turn, has the advantage that the user immediately recognizes that the steam reduction mode has not yet ended because they can see that steam reduction fluid is still being dispensed by the secondary dispensing device, thus giving them the opportunity to close the dishwasher door again immediately and wait for the operation to complete.

[0030] However, it is also possible to switch off all secondary dispensing devices for steam reduction fluid, located near the dishwasher door, only after a time delay, for example, 1 to 5 seconds. This ensures steam reduction continues for this period even after the dishwasher door has been opened. In particular, a secondary dispensing device located near the dishwasher door can create a kind of steam barrier in the area of ​​the open door, preventing any remaining steam from escaping.

[0031] A second dispensing device is particularly preferred, arranged in the wash chamber above the dishwasher door. This also has the advantage that a steam reduction fluid, which is dispensed directly and / or indirectly onto the inside of the dishwasher door, can run down the dishwasher door and thus continue to cool it.

[0032] Preferably, other and / or additional second dispensing devices are also arranged in an upper area of ​​the washing chamber, for example an upper area on the side walls or on the rear wall of the washing chamber.

[0033] However, it is also possible, in principle, for one or more secondary dispensing devices for a steam reduction fluid to be arranged in a lower area of ​​the wash chamber and to dispense the steam reduction fluid in a direction that is at least partially vertical and upwards. It is also possible to provide a combination of secondary dispensing devices, with some dispensing a steam reduction fluid from top to bottom and others dispensing a steam reduction fluid from bottom to top. This allows for particularly good spatial coverage.

[0034] According to the invention, the dishwasher comprises a steam reduction fluid temperature sensor capable of determining the temperature of the steam reduction fluid, and / or a wash chamber temperature sensor capable of determining the temperature within the wash chamber, and / or a humidity sensor arranged in the wash chamber capable of determining the humidity within the wash chamber, wherein the control device is configured to determine the duration for which steam reduction fluid is dispensed within the steam reduction mode, and / or the volume of steam reduction fluid dispensed during the steam reduction mode.depending on the temperature of the steam reduction fluid determined by the steam reduction fluid temperature sensor and / or depending on the temperature inside the wash chamber determined by the wash chamber temperature sensor and / or depending on the value determined by the humidity sensor inside the wash chamber.

[0035] The temperature sensor is preferably provided in a supply line that conveys the vapor reduction fluid to the dispensing device and in particular to the corresponding dispensing elements or dispensing nozzles.

[0036] The temperature of the vapor reduction fluid influences the vapor reduction, as the lower the temperature of the vapor reduction fluid, the more effective the vapor reduction.

[0037] In a particularly preferred embodiment, the control device of the dishwasher is designed such that the duration for which a steam reduction fluid is dispensed is adjusted depending on the temperature of the steam reduction fluid, preferably automatically by the control device. This ensures that the desired minimum steam reduction is achieved. Furthermore, it also ensures that steam reduction fluid is not dispensed for an unnecessarily long period, thus reducing both the amount of steam reduction fluid required and the duration of the steam reduction process.

[0038] Alternatively, it is also possible that the temperature of the vapor reduction fluid is known, and depending on this temperature, in particular the duration of the vapor reduction is set or the temperature is provided to the control device so that it controls and sets the duration of the vapor reduction and the duration of the dispensing of the vapor reduction fluid.

[0039] Alternatively or in addition to regulating or setting the duration of the vapor reduction fluid dispensed, the volume of vapor reduction fluid dispensed during the vapor reduction mode can also be regulated and / or set. Preferably, both the duration and the volume of vapor reduction fluid dispensed per unit of time (the flow rate) are set and / or regulated. It is also possible for the volume of vapor reduction fluid dispensed per unit of time (the flow rate) to vary over the duration of the vapor reduction fluid dispensed.

[0040] The change or adjustment of the volume of vapor reduction delivered per unit of time, the volume flow rate, is preferably carried out via an adjustment / control of the second delivery device, whereby, for example, the delivery pressure of the vapor reduction fluid is also adjusted differently.

[0041] In a preferred embodiment, the dishwasher is designed such that, at a temperature of the steam reduction liquid of about 20 °C, the steam reduction liquid is dispensed over a period of 50 seconds at a volume flow rate of 3 l / min, preferably or for example from a second dispensing device which is arranged in an area above the dishwasher door.

[0042] At a lower temperature of the vapor reduction fluid, the delivery time can be reduced. At a temperature of 10 °C, for example, it can be reduced to 40 seconds, also at the aforementioned flow rate of 3 l / min.

[0043] At higher temperatures of the vapor reduction fluid, the time period can be extended, for example to 60 seconds at a temperature of 30 °C, and to 90 seconds at a temperature of 40 °C.

[0044] In another preferred embodiment, the dishwasher also includes a wash chamber temperature sensor that determines the temperature inside the wash chamber. From this, conclusions can be drawn about the quantity and type of steam and the condition inside the wash chamber, in particular regarding how much steam or moisture is present.

[0045] In another preferred embodiment, the control device of the dishwasher is designed such that the duration for which steam reduction is carried out is set depending on the temperature inside the washing chamber.

[0046] Alternatively or additionally, it is also possible to adjust the volume of steam reduction fluid released during the steam reduction mode, depending on the temperature inside the wash chamber.

[0047] Particularly preferred are both a temperature sensor for determining the temperature of the steam reduction liquid and a temperature sensor for determining the temperature within the washing chamber, wherein both temperatures are particularly preferably used for controlling the dispensing of the steam reduction liquid and in particular the duration of the dispensing of the steam reduction liquid is automatically set and / or adjusted depending on these temperatures.

[0048] In a further, preferred embodiment, the dishwasher also includes a humidity sensor located within the wash chamber, which can determine the humidity within the wash chamber, in particular the relative humidity. This sensor also determines values ​​regarding the state of the steam in the wash chamber, so that the steam reduction, in particular the duration of the steam reduction fluid dispensed or the volume of steam reduction fluid dispensed during the steam reduction mode, can also be controlled based on this humidity sensor.

[0049] The invention also relates to a method for operating a commercial dishwasher, in particular for operating a commercial dishwasher as described above. With regard to the specific effects and advantages of such a method, reference is made to the above description to avoid repetition.

[0050] The invention and its advantages become even clearer with the help of the following figures: Fig. 1 schematically shows a functional sketch of an embodiment of a dishwasher according to the invention, Fig. 2 schematically shows a top view from the front of an embodiment of a dishwasher according to the invention with an open dishwasher door, and Fig. 3 shows a schematic side section view of an embodiment of a dishwasher according to the invention with a closed dishwasher door.

[0051] Fig. 1 Figure 1 schematically shows a functional diagram of an embodiment of a dishwasher 10 according to the invention, which has a wash chamber 50. A dish basket 300 for receiving dishes 310 is arranged in the wash chamber 50.

[0052] In the rinsing chamber 50, a first dispensing device 100 for dispensing treatment fluid is provided, wherein in Fig. 1 Only one such first dispensing device 100 with dispensing nozzles 110 is shown. The first dispensing device 100 is rotatably mounted in the rinsing chamber 50. Several such first dispensing devices for dispensing treatment fluid can also be provided in the rinsing chamber 50; each of the dispensing devices can comprise a different number of dispensing nozzles. Typically, at least one upper first dispensing device and one lower first dispensing device are provided.

[0053] The dishwasher 10 is supplied with fresh water via a fresh water line 600. The fresh water is directed via a solenoid valve 610 to a backflow preventer 620. The fresh water can then be discharged via lines 630 to a boiler 650, which is equipped with a heating device 652. From there, the treatment fluid, optionally heated, can be directed via a line 660 and a pump 662, optionally with the addition of treatment or cleaning agent (not shown here), to the first dispensing device 100 (or to several first dispensing devices) located in the wash chamber 50. The first dispensing device 100 comprises several dispensing nozzles 110 through which treatment fluids can be discharged onto the items 310 located in the wash chamber 50 during a wash cycle in which the dishwasher 10 is operating.

[0054] Fresh water can also be routed from the backflow preventer 620 via a further valve 670 and a line 672 to a second dispensing device 200 with dispensing nozzles 210. This fresh water serves as a steam reduction fluid and, during a steam reduction mode, is dispensed into the wash chamber 50 and, in particular, onto at least one of the inner walls of the wash chamber 50.

[0055] In other embodiments, it is also possible to provide other sources of fresh water or another liquid, which is stored, for example, in a tank.

[0056] It is also possible that, in another embodiment, different sources are used for the treatment fluid on the one hand and the fume reduction fluid on the other. The supply lines can also be separated accordingly.

[0057] Fig. 2 Figure 1 schematically shows a front view of an embodiment of a dishwasher 10 according to the invention with an open dishwasher door 60. The wash chamber 50 is bounded by two side walls 61 and 63, a left side wall 61 and a right side wall 63 in this view, as well as a rear wall 62. When the dishwasher door 60 is closed, the wash chamber is further bounded by an inner wall 64 of the dishwasher door 60, see Figure 1. Fig. 3

[0058] In this embodiment, a second dispensing device 200 for dispensing steam reduction fluid is arranged in an upper area of ​​the wash chamber 50, above the dishwasher door 60 or above the opening for the dishwasher door.

[0059] In this embodiment, the second dispensing device 200 comprises a total of four dispensing nozzles 210, each having a dispensing cone directed downwards. The inner angle of the dispensing cone, also called the spray angle, is parallel to the rear wall 62 or the inner wall 64 of the dishwasher door 60 (see angle α in Figure 1). Fig. 2 When in a closed state, the angle of the dispensing element is approximately 100° in this embodiment, but in other embodiments it can also be in a range, for example, from approximately 60° to 160°. The dispensing characteristics of the dispensing elements or nozzles 210 can be adapted in other embodiments, and the size of the internal angles of the dispensing cone depends in particular on the selected number of dispensing elements and the size of the rinsing chamber 50. It is also possible to use different nozzles with different dispensing characteristics and different dispensing cones.

[0060] Fig. 3 Figure 1 schematically shows a side view of an embodiment of a dishwasher 10 according to the invention, in which the dishwasher door 60 is closed. The Fig. 3 The embodiment shown comprises two first dispensing devices for dispensing treatment fluid, an upper first dispensing device 100 with dispensing elements 110 and a lower first dispensing device 110' with dispensing elements 110' for dispensing treatment fluid.

[0061] In Fig. 3 A second dispensing device 200 for dispensing steam reduction fluid with a dispensing element 210 is shown, wherein the second dispensing device 200 is arranged in an upper area of ​​the wash chamber 50 and above the dishwasher door 60, which is in Fig. 3 is shown closed.

[0062] As in Fig. 3 The discharge cone of discharge element 210 (and also of the other discharge elements that are in) is evident. Fig. 3 (are not visible) are inclined towards the dishwasher door 60. The inner angle of the dispensing cone (the spray angle) is in a direction perpendicular to the inner wall 64 of the dishwasher door 60 (angle β, see Fig. 3 ), relatively small, in particular it is preferably smaller than the inner angle of the dispensing cone (the spray angle) in a direction parallel to the plane of the inner wall 64 of the dishwasher door 60 (angle a, see Fig. 2 ), when it is in its closed state. The angle β is preferably in a range of about 10° to 30°. The angle α is preferably in a range of about 60° to 160°.

[0063] How Fig. 3 As clearly shown, this ensures that a large part of the inner wall 64 of the dishwasher door 60 is directly exposed to steam reduction fluid; in this embodiment, the dispensing elements 210 directly expose approximately 80% of the inner wall 64 of the dishwasher door 60 to steam reduction fluid.

[0064] At the in Fig. 3 The forms of expression shown also include further secondary dispensing devices for the dispensing of vapor reduction fluid near the side walls, which, however, are located in Fig. 3 are not visible. However, in this embodiment, no second dispensing device for dispensing steam reduction fluid is provided in the area of ​​the rear 62 of the rinsing chamber.

[0065] The features shown in the description and in the figures can be essential for the realization of the invention, both individually and in any combination.

Claims

1. Commercial dishwasher (10) with a washing chamber (50) in which at least one first dispensing device (100, 100') is arranged for dispensing a treatment liquid for cleaning items to be washed (310), wherein the washing chamber (50) is delimited by one or more interior walls (61, 62, 63, 64), wherein the dishwasher (10) is designed such that it is operable in at least two operating modes, wherein the dishwasher (10) comprises a control device which is designed such that it is able to switch the dishwasher (10) into an operating mode selected by a user or into an operating mode predetermined according to a washing program and to control the operation of the dishwasher (10), wherein the operating modes comprise at least one treatment mode for items to be washed and at least one vapor reduction mode, wherein the dishwasher (10) comprises at least one second dispensing device (200) for dispensing a vapor reduction liquid, which dispensing device is arranged in the washing chamber (50) such that it may dispense the vapor reduction liquid directly and / or indirectly on at least one portion of at least one of the interior walls (60, 61, 62, 63) of the washing chamber (50) when the dishwasher (10) is in a vapor reduction mode, characterized in that the dishwasher comprises a vapor reduction liquid temperature sensor (642) which is able to determine the temperature of the vapor reduction liquid, and / or comprises a washing chamber temperature sensor (52) which is able to determine the temperature within the washing chamber (50), and / or comprises a humidity sensor which is arranged in the washing chamber (50) and is able to determine the humidity within the washing chamber (50), wherein the control device is designed such that it sets the period of time, during which a vapor reduction liquid is dispensed within the vapor reduction mode, and / or a volume of the vapor reduction liquid which is dispensed during the vapor reduction mode, depending on the temperature of the vapor reduction liquid determined by the vapor reduction liquid temperature sensor (642) and / or depending on the temperature within the washing chamber (50) determined by the washing chamber temperature sensor (52) and / or depending on a value within the washing chamber (50) determined by the humidity sensor (52).

2. Dishwasher according to claim 1, characterized in that it comprises a dishwasher door (60) which may be opened to open the washing chamber (50) and for removing the items to be washed (300), preferably may be pivoted about an axis of rotation, wherein at least one second dispensing device (200) for dispensing a vapor reduction liquid is arranged in the washing chamber (50) such that said dispensing device is able to dispense vapor reduction liquid directly on at least one portion of an interior wall (64) of the dishwasher door (60) which this is located in its closed position.

3. Dishwasher according to claim 2, characterized in that at least one second dispensing device (200) for dispensing a vapor reduction liquid is arranged in the washing chamber (50) such that it is able to dispense a vapor reduction liquid directly and / or indirectly on at least 30 % of the total surface area of the interior wall (64) of dishwasher door (60), preferably on at least 50 % of the total surface area of the interior wall (64) of the dishwasher door (60), particularly preferably on at least 80 % of the total surface area of the interior wall (64) of the dishwasher door (60), when this is located in its closed position.

4. Dishwasher according to one of the preceding claims, characterized in that at least one second dispensing device (200) for dispensing a vapor reduction liquid is arranged in the washing chamber (50) such that it is able to dispense a vapor reduction liquid directly and / or indirectly on at least 30 % of the total surface area of at least one interior wall (61, 62, 63, 64) of the washing chamber (50), preferably on at least 50 % of the total surface area of at least one interior wall (61, 62, 63, 64) of the washing chamber (50), particularly preferably on at least 80 % of the total surface area of at least one interior wall (61, 62, 63, 64) of the washing chamber (50).

5. Dishwasher according to one of the preceding claims, characterized in that at least one second dispensing device (200), in particular multiple second dispensing devices (200) for dispensing a vapor reduction liquid is / are arranged in the washing chamber (50) such that it / they is / are able to dispense a vapor reduction liquid directly and / or indirectly on at least 30 %, preferably on at least 50 %, particularly preferably on at least 80 % of the total surface area of two interior walls (61, 63) or three interior walls (61, 62, 63) of the washing chamber (50).

6. Dishwasher according to one of the preceding claims, characterized in that the control device of the dishwasher (10) is designed such that it immediately interrupts the dispensing of a vapor reduction liquid by at least one second dispensing device (200) for dispensing a vapor reduction liquid, in particular by all second dispensing devices (200) for dispensing a vapor reduction liquid, when the washing chamber (50) is opened, in particular by a dishwasher door (60) .

7. Dishwasher according to one of claims 1 to 5, characterized in that the control device of the dishwasher (10) is designed such that it interrupts the dispensing of a vapor reduction liquid by at least one second dispensing device (200) for dispensing a vapor reduction liquid, in particular by all second dispensing devices (200) for dispensing a vapor reduction liquid, after a predetermined time period, when the washing chamber (50) is opened, in particular by a dishwasher door (60).

8. Dishwasher according to one of the preceding claims, characterized in that at least one second dispensing device (200) for dispensing a vapor reduction liquid is arranged in an upper area of the washing chamber (50), preferably within the upper 20 % of the vertical dimension of the washing chamber (50) or the vertical extension of an interior wall (61, 62, 63, 64) of the washing chamber (50).

9. Dishwasher according to one of the preceding claims, characterized in that at least one second dispensing device (200) for dispensing a vapor reduction liquid is arranged in the washing chamber (50) above a dishwasher door (60) or above an opening of the washing chamber (50) which is closed by the dishwasher door (60).

10. Method for operating a commercial dishwasher (10) according to one of the preceding claims, with a washing chamber (50), wherein the washing chamber (50) is delimited by one or more interior walls (61, 62, 63, 64), wherein the dishwasher (10) may be operated in at least two operating modes, wherein at least one treatment mode for items to be washed and at least one vapor reduction mode are available, wherein, during a vapor reduction mode, a vapor reduction liquid is dispensed for a controllable period of time directly and / or indirectly on at least one portion of at least one of the interior walls (61, 62, 63, 64) of the washing chamber (50) , characterized in that the period of time, during which a vapor reduction liquid is dispensed during the vapor reduction mode, and / or a volume of the vapor reduction liquid, which is dispensed during the vapor reduction mode, is set by a control device depending on the temperature of the vapor reduction liquid determined by a vapor reduction liquid temperature sensor (642) and / or depending on the temperature within the washing chamber (50) determined by a washing chamber temperature sensor (52) and / or depending on a value within the washing chamber (50) determined by a humidity sensor (52).