Domestic dishwasher having a sorption drying system and associated method for carrying out an energy-saving dishwashing programme

Abstract

The invention relates to a domestic dishwasher (GS) having a sorption drying system (SY) and control logic (LO) for operating dishwashing programmes (GP1, GP2, EP) such that the dishwashing programmes (GP1, GP2, EP) have, at the end of their respective regeneration heating phases (HP1, HP2, HP3), which are carried out by means of a desorption heating device (HV), after the desorption heating device (HV) has been turned off, follow-on phases (NP1, NP2, NP3) of different lengths, during which an air conveying unit (LF) forcibly conveys washing chamber air (PL´) from the washing chamber (SR) of the domestic dishwasher further through the sorption container (SOB) of the sorption drying system (SY).

Description

[0001] Household dishwasher with a sorption drying system and associated method for carrying out an energy-saving dishwashing program

[0002] The invention relates to a household dishwasher with a washing chamber for receiving items to be cleaned, with a control / monitoring unit for carrying out several dishwashing programs, wherein the respective dishwashing program comprises one or more liquid-carrying partial washing phases, during which the items to be cleaned are exposed to washing liquid, and a drying phase concluding the washing program, and with a sorption drying system which

[0003] • a recirculation duct arranged outside the washing chamber, which fluidically connects an air outlet of the washing chamber with an air inlet of the washing chamber,

[0004] • a sorption container fluidically inserted into the recirculating air duct, in which a fixed bed of a granular or granular, reversibly dehydratable sorption material is accommodated,

[0005] • an air conveying unit fluidically inserted into the recirculating air duct, which, at least during a period of time, in particular the initial period of time, of the drying phase of the respective dishwashing program to be carried out, forcibly conveys warm, moist air from the washing chamber for its dehumidification through the sorption container, and

[0006] • a desorption heating device with a fixed predetermined heating output, which during a regeneration heating phase, during which the air conveying unit forcibly conveys wash chamber air through the recirculation duct and which takes place in at least one rinsing phase, in particular the cleaning phase, of the respective dishwashing program to be carried out, actively heats the wash chamber air supplied to the sorption material of the fixed bed by introducing thermal energy in such a way that the sorption material desorbs water that has been stored in the sorption material during the drying phase of the preceding dishwashing program.

[0007] To regenerate the granular or granular, particularly spherical, reversibly dehydratable sorption material of the fixed bed, the desorption heating device heats the washroom air, which is forcibly fed to this sorption material by means of the air conveying unit, at least temporarily during the regeneration phase, with a fixed or constant heating output using electrical energy. It is preferably designed as an electric air heater, which is provided in the recirculating air duct, viewed in the forced air flow direction of the air conveying unit, upstream of the inlet cross-sectional area of ​​the fixed bed housed in the sorption container. It thus heats the washroom air, which is forcibly fed by the air conveying unit during the respective regeneration phase, upstream of the inlet cross-sectional area of ​​the fixed bed housed in the sorption container, viewed in the direction of flow.

[0008] The invention is based on the object of further improving such a household dishwasher with a sorption drying system in the execution of its dishwashing programs, in particular at least one energy-saving program.

[0009] This object is achieved in a household dishwasher of the type mentioned at the outset in that a control logic operates the sorption drying system in such a way that the dishwashing programs, at the end of their regeneration heating phases after the desorption heating device has been switched off, have follow-up phases of the air conveying unit of varying lengths, during which the air conveying unit continues to forcibly convey wash cabinet air from the wash cabinet through the sorption container.

[0010] In this way, a household dishwasher according to the invention is provided with a plurality of dishwashing programs that differ from one another in terms of different energy efficiency levels. In particular, the dishwashing programs provided include at least one energy-saving program whose electrical energy consumption is lower than the electrical energy consumption of at least one other dishwashing program, preferably all other dishwashing programs.

[0011] The duration of the run-on phase is expediently coordinated with the duration of the desorption heating phase of the respective dishwashing program in such a way that the regeneration phase, during which the regeneration of the sorption material can be effected, consists of the regeneration heating phase of the desorption heating device and the subsequent run-on phase of the air conveying unit. By varying the timing of the run-on phase, the regeneration phase of the respective dishwashing program, during which the regeneration of the sorption material can be effected, and which consists of the regeneration heating phase of the desorption heating device and the subsequent run-on phase of the air conveying unit, can be changed in an energetically favorable manner.

[0012] Because the control logic changes, i.e. extends or shortens, the duration of the run-on phase of the air conveying unit, which follows the regeneration heating phase of the desorption heating device, depending on the dishwashing program to be carried out, the duration of a regeneration phase of the respective dishwashing program, which consists of the regeneration heating phase and the run-on phase, can be varied, during which regeneration or desorption of the sorption material takes place or is effected, without additional electrical energy consumption for the desorption heating device, since this is switched off during the run-on phase. In this way, a variety of dishwashing programs can be provided which meet different energy efficiency requirements and, if necessary, one or more other requirements, such asto their respective drying performance, respective drying time, respective temperature which is to be reached for the rinsing liquid during a partial rinsing phase, in particular the cleaning phase of the respective dishwashing program in which the desorption of the sorption material takes place, ... etc., without any additional energy expenditure being required.

[0013] If the durations of the desorption heating phases of the multiple dishwashing programs vary or differ from one another, the durations of the follow-up phases can preferably be coordinated or adjusted to these desorption heating phases by means of the control logic in such a way that, overall, i.e., regeneration phases composed of desorption heating phases and associated follow-up phases, result for the multiple dishwashing programs, each of which leads to sufficient and energy-efficient desorption of the sorption material. In particular, the control logic can individually or separately adjust the duration of the regeneration heating phase to be carried out by means of the desorption heating device and the duration of the follow-up phase of the air conveying unit.specifically adapt to each other for the respective dishwashing program to be carried out so that a predetermined energy efficiency requirement is met and at the same time perfect drying of the items to be washed can be ensured. If the control unit has several different dishwashing programs, such as an energy-saving dishwashing program, in particular a so-called eco dishwashing program, a so-called auto dishwashing program, in which in particular the degree of soiling of the washing liquid when washing the items to be cleaned is determined preferably by means of at least one sensor such as a turbidity sensor and is used for the automatic setting of at least one washing parameter and / or drying parameter, a quick program, an intensive cleaning program (in particular with an increased temperature during its cleaning phase), a night cleaning program, a special program for washing glasses, etc.... , which differ from one another in terms of the different lengths of their regeneration or desorption heating phases, the control logic expediently assigns to these regeneration heating phases of different lengths follow-up phases of the air conveying unit of different lengths, during which the air conveying unit forcibly conveys wash cabinet air from the wash cabinet through the sorption container, whereas the desorption heating device is already switched off.

[0014] In a corresponding manner, the control logic can adapt the run-on phase following the desorption heat-up phase for the regeneration phase of the currently selected dishwashing program if the program changes the duration of its desorption heat-up phase, i.e., extends or shortens it. For example, the currently running dishwashing program can shorten its desorption heat-up phase if, during the previous dishwashing program, the dishwasher's wash chamber was only partially loaded with items to be washed, so that after the last partial wash phase of this previous dishwashing program, a smaller total amount of water had to be absorbed by the sorption material of the sorption drying system during its drying phase than with a full load of items to be washed. Through this individual orBy specifically adapting the duration of the desorption heating phase and the duration of the subsequent run-on phase, the sorption material of the fixed bed can be regenerated in a more energy-saving or energy-efficient manner than if the air conveying unit were to convey the wash chamber air through the sorption container for all dishwashing programs of the dishwasher with only the same, i.e. fixed or preset, duration for the run-on phase.

[0015] The shorter the desorption heating phase is selected for the respective dishwashing program in order to save electrical energy for the desorption heating device, the longer the run-on phase of the air conveying unit is expediently selected by the control logic in order to be able to continue the desorption or regeneration of the sorption material using the amount of heat it previously introduced into the sorption drying system during the desorption heating phase, up to a degree of dehumidification or drying that is sufficient for the sorption material to sorb or absorb sufficient moisture from the moist dishwashing chamber air to dry the items of dishware properly during the drying phase of a subsequent dishwashing program, despite the desorption heating device being switched off during the run-on phase.

[0016] According to an advantageous development of the invention, the control logic which sets the run-on time of the air conveying unit in coordination with the desorption heating time during which the desorption heating device is in operation for the regeneration phase of the respective dishwashing program can be a component of the control / monitoring unit which is provided for carrying out the plurality of dishwashing programs. The control / monitoring unit and / or the control logic can preferably be implemented by one or more hardware components which can in particular comprise a microcomputer system with an electronic storage system, and / or by one or more software components which can be stored in at least one electronic memory of a computer, in particular a microcomputer system, of the household dishwasher according to the invention and which control the sequence procedure, i.e. the sequence of one or more rinsing steps orThe control logic can include and implement the rinsing phases and the final drying phase of the respective dishwashing program. In particular, the control logic can be a program part or a subroutine of the sequence procedure of the respective dishwashing program to be executed.

[0017] According to an advantageous development of the invention, it may be advantageous if the control logic for implementing the regeneration phase of the respective dishwashing program operates the air conveying unit with a higher volume flow of forced-air wash cabinet air during the regeneration heating phase than during the subsequent run-on phase. To achieve this, if the air conveying unit is a fan, the control logic for implementing the regeneration phase of the respective dishwashing program advantageously sets a first fan speed during the regeneration heating phase and a second speed, lower than the first speed, during the subsequent run-on phase.By reducing the flow rate of the forced air in the wash chamber during the run-on phase, the wash chamber air forced through the recirculation duct by means of the air conveying unit can flow at a lower speed and thus with a longer contact time past the switched off desorption heating device, such as a tubular heater, as well as past one or more components of the recirculation duct arranged downstream of the desorption heating device HV in the flow direction, such as past a flow conditioning element, and / or flow through an inlet-side sieve grid of the fixed bed and the sorption container with the fixed bed of the granular or granular, reversibly dehydratable sorption material.As a result, the sensible heat stored in these components, which they previously absorbed during the desorption heating phase with the desorption heating device switched on, is now released back into the wash chamber air flowing past them during the run-on phase. Thus, the lack of heat input caused by switching off the desorption heating device during the run-on phase can be partially or at least somewhat compensated, so that the inlet temperature of the forced-air wash chamber air, at which it enters the inlet-side face of the fixed bed of granular or granular, reversibly dehydratable sorption material, does not drop too quickly.Thus, the regeneration of the sorption material can advantageously be continued for a longer period compared to the case where the conveying volume flow of forced-feed washroom air during the run-on phase would have remained the same as the conveying volume flow of the forced-feed washroom air during the desorption heating phase.

[0018] It is particularly advantageous if the run-on phase of the air conveying unit lasts at most until a point in time at which the dew point temperature of the air leaving the fixed bed is greater than or equal to the dew point temperature of the wash chamber air flowing into the fixed bed and the absolute temperature of the air leaving the fixed bed is greater than or equal to the absolute temperature of the wash chamber air flowing into the fixed bed. This is because as long as the dew point temperature of the air discharged from the fixed bed is greater than the dew point temperature of the wash chamber air supplied to the fixed bed, moisture will continue to be expelled from the sorption material even after the desorption heating phase during the run-on phase (with the desorption heating device switched off), i.e. its regeneration or desorption will continue.At the same time, during the run-on phase, heat recovery from the sorption drying system into the wash chamber also takes place as long as the absolute temperature of the air leaving the fixed bed is higher than the absolute temperature of the wash chamber air flowing into the fixed bed.

[0019] In particular, it may be advantageous for at least one energy-saving program if its regeneration heating phase lasts only between 5 - 13 minutes, in particular about 8 minutes, and the run-on phase of the air conveying unit lasts more than 1.5 minutes, in particular between 2 and 4 minutes, preferably about 2.5 minutes.

[0020] In particular, the household dishwasher according to the invention can have at least one energy-saving program whose regeneration heating phase is shortened compared to the regeneration heating phase of at least one other dishwashing program, in particular compared to the regeneration heating phases of all other dishwashing programs, and whose run-on phase is longer than the run-on phase of this other dishwashing program, in particular compared to the run-on phases of all other dishwashing programs. The energy-saving program can preferably meet an energy label B or even an energy label A of the energy consumption classification scheme valid in the EU from March 1, 2021. It is referred to in particular as a so-called Eco program.

[0021] In particular, the sorption material can be regenerated during at least one liquid-carrying partial wash phase of the energy-saving program, despite the shortened desorption heating phase, by the extended after-run phase to such an extent that the drying of the wash items in the wash cabinet during the program-final drying phase is successful without the door being opened in a gap, ie the door of the dishwasher can remain completely closed during the drying phase.

[0022] Furthermore, the invention also relates to a method for operating a household dishwasher designed according to the invention according to claim 9.

[0023] Finally, the invention relates to a method for carrying out at least one energy-saving dishwashing program of a household dishwasher having a sorption drying system, according to claim 10.

[0024] Further developments of the invention are set forth in the subclaims. The advantageous embodiments and / or developments of the invention explained above and / or set forth in the subclaims can be applied individually or in any combination with one another - except, for example, in cases of clear dependencies or incompatible alternatives.

[0025] The invention and its advantageous embodiments and / or further developments as well as their advantages are explained in more detail below with reference to drawings.

[0026] They show, in a schematic principle sketch:

[0027] Figure 1 shows a schematic representation of an advantageous embodiment of a household dishwasher designed according to the invention with a sorption drying system, the sorption material of which is regenerated according to the principle of the invention when carrying out one or more dishwashing programs, in particular at least one energy-saving dishwashing program,

[0028] Figure 2 shows a schematic representation of the temporal humidity and temperature profiles of the air sucked from the washing chamber of the household dishwasher into the recirculation duct of the sorption drying system by means of its air conveying unit during recirculation mode and of the air returned from the sorption container of the sorption drying system into the washing chamber during the regeneration phase of an energy-saving program of the household dishwasher of Figure 1, in which the run-on phase of the air conveying unit of the sorption drying system is extended (with the desorption heating device switched off),

[0029] Figure 3 is a schematic representation of the flow extension, in particular the height extension, of the fixed bed of loose sorption material, which is accommodated in the sorption container of the sorption drying system of the household dishwasher of Figure 1, the local profile of the regeneration temperature induced in the sorption material during the regeneration phase of the energy-saving program of Figure 2, for example, approximately at the end of the shortened regeneration heating phase of the desorption heating device, in comparison to the local profile of the regeneration temperature induced in the sorption material at the end of the run-on phase of the air conveying unit of the sorption drying system of the household dishwasher of Figure 1, following the regeneration heating phase, during which the desorption heating device is switched off, and

[0030] Figure 4 shows a schematic representation of the various phases of the energy-saving dishwashing program shown as an example in Figure 2, in which the duration of the run-on phase of its regeneration phase is extended compared to other selectable, less energy-efficient dishwashing programs.

[0031] Elements with the same function and mode of operation are provided with the same reference numerals in the figures.

[0032] Figure 1 shows a schematic representation of an exemplary household dishwasher GS with a sorption drying system SY, the sorption material of which is regenerated according to the principle of the invention when carrying out several dishwashing programs, in particular at least one energy-saving dishwashing program.

[0033] The household dishwasher GS has a wash chamber SR for holding items to be cleaned. The wash chamber SR is defined by the walls of an approximately cuboid-shaped wash tub SB and a door, in particular a front door, closing its loading opening, in particular the front-facing one. This door is omitted from the schematic front view of Figure 1 for the sake of simplicity. For the sake of simplicity, the boundary walls of the wash tub SB are, for an operator standing in front of the household dishwasher GS for its intended use, specifically a left-hand side wall, a right-hand side wall, a top wall, a bottom wall, and a rear wall.In the wash cabinet SR, one or more receiving units, in particular a lower crockery basket, an upper crockery basket, and / or a cutlery drawer preferably arranged above the upper crockery basket, are provided to hold the items to be cleaned. The latter is omitted from Figure 1 for the sake of clarity and space. One or more spray devices and / or other liquid distribution devices are provided in the wash cabinet SR to apply washing liquid to the items placed in the receiving units. These can include, in particular, rotatable spray arms, an upper roof spray or an upper roof rotor, and / or other liquid application means, such as spray units specially attached to the one or more crockery baskets.In Figure 1, a lower and an upper rotatable spray arm SV are shown in simplified form in the wash cabinet SR, representing the liquid application means, as well as a lower crockery basket UB and an upper crockery basket OB, representing the receiving units for storing the items to be cleaned. The lower rotatable spray arm is assigned in particular to the lower crockery basket UB and the upper rotatable spray arm is assigned in particular to the upper crockery basket OB. For the respective wash operation of the household dishwasher during one or more different wash phases of the respective dishwashing program to be carried out, wash liquid is admitted into the wash cabinet SR by means of a water inlet system, which is omitted in Figure 1 for the sake of simplicity of the drawing. The wash liquid is conveyed by means of a circulation pump UP via one or more liquid lines VL to the spray devices and / or liquid distribution devices, such asSV and sprayed by them onto the items to be cleaned in the holding units. The rinsing liquid drips to the floor and collects in a pump sump or pump pot PS, which is provided beneath the bottom wall of the washing container SB. The circulating pump UP sucks the rinsing liquid from the pump sump PS, preferably via an intake nozzle, and pumps it to the spray devices and / or liquid distribution devices such as SV via the one or more liquid lines VL. In this way, a liquid circulation circuit is provided. This can preferably comprise further components, such as a water switch for the selective control of the respective liquid line, which leads separately to the respective spray device and / or liquid distribution device. The liquid circulation circuit also contains, in particular, a liquid heater orA water heater (WH) is provided to heat the rinsing liquid to a desired heating temperature or target heating temperature as needed. Here, in the embodiment shown in Figure 1, the liquid heater (WH) is preferably assigned to the circulation pump (UP). In particular, the liquid heater is housed within the circulation pump, meaning that the circulation pump (UP) is preferably designed as a heating pump.

[0034] The sorption drying system SY has a recirculating air duct UK arranged outside the wash chamber SR. This recirculating air duct ÜK fluidically connects an air outlet AL of the wash chamber SR with an air inlet EL of the wash chamber SR. For example, a through-opening in a side wall - as here in the exemplary embodiment of Figure 1, viewed from the front, in the right-hand side wall - of the wash container SB can be provided as the air outlet AL, and a through-opening, preferably in a different boundary wall of the wash chamber SR - here in the exemplary embodiment of Figure 1, in the bottom wall of the wash container SB - can be provided as the air inlet EL. A sorption container SOB is fluidically inserted into the recirculating air duct UK. In this exemplary embodiment, this is preferably cylindrical, in particular circular-cylindrical. In this exemplary embodiment, it preferably extends at least approximately in the vertical direction.Its interior is filled between a lower screen grid US and an upper screen grid OS with a fixed bed FS of a loose, granular and / or granular, reversibly dehydratable sorption material SM. Thus, in this exemplary embodiment, the fixed bed FS forms a sorption column, preferably with a cylindrical shape, in particular at least approximately circular-cylindrical, which extends at least approximately vertically. Viewed in the vertical direction, the bed has a predetermined maximum or upper bed height SH. The fixed bed FS of the sorption material SM is thus accommodated in the sorption container SOB in such a way that it can be flowed through by a forced air flow, which can be generated by means of an air conveying unit LF fluidically inserted into the recirculating air duct UK, from bottom to top, in particular essentially in a vertical direction against the direction of gravity.Their geometric shape and orientation largely ensure that, viewed across their height extension up to their specified maximum filling height SH, they have a largely uniform or homogeneous cross-sectional area filled with loose sorption material SM at each height point HS, and that this distribution of loose sorption material SM is maintained permanently over the service life of the household dishwasher GS. Preferably, the grains and / or granules of the sorption material SM can each be spherical. These sorption material spheres increase the thermal contact area of ​​the sorption material for air blown through gaps between the sorption material spheres.On the other hand, they can be used to ensure an at least approximately uniform bulk density relative to the respective passage cross-sectional area of ​​the fixed bed FS, which is arranged at least approximately orthogonally to the flow direction directed at least approximately vertically from bottom to top and thus here in the exemplary embodiment at least approximately horizontally, over its filling height SH. A first air duct section LK1 of the recirculating air duct UK runs between the air outlet AL of the wash chamber SR and the air inlet E1 of the sorption container SOB. The air conveying unit LF is preferably fluidically inserted into this. The air conveying unit LF is therefore preferably fluidically inserted into the recirculating air duct UK between the air outlet AL of the wash chamber SR and the air inlet E1 of the sorption container SOB upstream of the sorption container SOB in the flow direction of the wash chamber air forcibly conveyed through it.The air conveying unit LF is expediently formed here in the embodiment of Figure 1 by a fan or blower. When the air conveying unit LF is in operation, i.e. switched on, it draws in wash chamber air from the wash chamber SR via the upstream section of the first air duct section LK1 and then actively blows this air via the downstream section of the first air duct section LK1 arranged downstream of it to the sorption container SOB and via its lower air inlet E1 into the wash container SOB. There, the forcibly conveyed wash chamber air flows through the fixed bed FS of the loose, granular or granular, reversibly dehydratable sorption material SM from bottom to top, in particular essentially in a vertical direction against the direction of gravity.The washroom air forced through the fixed bed FS leaves the sorption container SOB via its upper air outlet AU and is conveyed into the air inlet EL of the washroom SR either directly or, as in the exemplary embodiment of Figure 1, via a second air duct section LK2 of the recirculation duct UK. If the air conveying unit LF is switched on, it draws air from the washroom SR via its air outlet AL into the recirculation duct UK and then blows it through the fixed bed FS of the loose, granular and / or granular, reversibly dehydratable sorption material SM of the sorption container SOB and then back into the washroom SR via the air inlet EL. In this way, air from the wash cabinet (i.e. wash cabinet air) circulates via the recirculation duct UK to the sorption container SOB fluidically inserted in the recirculation duct UK and from there back into the wash cabinet SR when the air conveying unit LF is switched on.The forced air flow generated in this way during operation of the air conveying unit LF through the recirculation duct UK, through the fixed bed FS of the loose sorption material SM and through the rinsing chamber SR is indicated in Figure 1 by directional arrows ZLS.

[0035] For the regeneration or desorption of the sorption material SM of the fixed bed FS, a desorption heating device HV is assigned to it, by means of which thermal energy can be provided to detach adsorbed water molecules from the sorption material SM. The desorption heating device HV is provided here in the embodiment of Figure 1, preferably in the air flow direction of the forced air flow generated in the recirculation duct UK when the air conveying unit LF is running, upstream of the fixed bed FS of the sorption material SM in an inlet-side region of the sorption container SB in front of the inlet-side, lower end face of the fixed bed FS. The desorption heating device HV is located here in the embodiment of Figure 1 in particular in an anteroom of the sorption container SOB, which is arranged below the lower sieve grid US of the fixed bed FS.It can preferably be formed by a tubular heater, the windings of which are expediently arranged in a common, here in particular horizontal, plane. The forcibly conveyed wash chamber air PL' can preferably flow through gaps between the windings of the tubular heater and flow over and / or around their outer surfaces, whereby thermal heat exchange contact occurs between the tubular heater and the passing wash chamber air PL' and, as a result, the desired heating of the latter before it enters the fixed bed FS. Alternatively, the desorption heating device HV can optionally be designed as an electric wire heater, past which the forcibly conveyed wash chamber air PL' flows by means of the air conveying unit LF and is heated before it enters the fixed bed FS. This electric wire heater can optionallybe arranged in the end section of the first air duct section LK1 of the recirculation duct UK. Because the wash chamber air PL', which flows through the fixed bed FS of the loose, granular or granular, reversibly dehydratable sorption material SM, is heated by the desorption heating device HV before entering the fixed bed FS as viewed in the forced air flow direction ZLS of the air conveying unit LF, it is largely ensured that the air PL', which is conveyed by the switched-on air conveying unit LF during the regeneration phase from the wash chamber SR to the sorption container SOB and from there back into the wash chamber SR, flows into the fixed bed FS at a defined heating temperature and that the heated air PL' acts on the inlet-side front surface, i.e. the inlet cross-sectional area, of the fixed bed FS, in a largely evenly distributed manner.Relative to the subsequent passage cross-sectional areas of the fixed bed at the various points along its vertical extension HS, the spaces between the loose grains and / or granulate particles of the sorption material SM are largely evenly flowed through by the air heated by the desorption heating device HV. This air transfers thermal energy or heat energy largely evenly to the grains and / or granules of the sorption material SM arranged in the respective passage cross-sectional area of ​​the fixed bed FS.

[0036] The household dishwasher GS comprises a control / monitoring unit CO for executing multiple dishwashing programs. Each dishwashing program comprises one or more partial wash phases, during which the items to be cleaned in the wash cabinet are sprayed with wash liquid by means of one or more spray devices and / or liquid distribution devices, and a drying phase concluding the wash program. Figure 4 illustrates, by way of example, the timing of the partial wash phases for three different dishwashing programs GP1, GP2, and EP, namely, a pre-wash phase VP, a cleaning phase RP, an intermediate wash phase ZP, and a final rinse phase KP. The final rinse phase TP is followed by the drying phase concluding the wash program.With regard to these sub-phases of the respective dishwashing program GP1, GP2, EP, a state diagram for the operating state of the desorption heating device HV is shown in the upper half of Figure 4 and, below it in the lower half of the figure, a speed diagram for a fan as the air conveying unit LF. The time t in minutes (abbreviated as "min") is plotted along the abscissa of these two diagrams. The state diagram for the desorption heating device HV indicates the operating state ZHV of the desorption heating device HV along its ordinates, i.e. whether it is switched on or off. The switched-on state of the desorption heating device HV is marked with E, and its switched-off state is marked with A. The speed diagram for the fan of the sorption drying system SY indicates the speed LD of the fan in revolutions per minute (abbreviated as rpm) along its ordinates.

[0037] First of all, during the respective dishwashing program such as GP1, GP2, GP3 here, from its start time tS, fresh water at tap temperature from a fresh water supply line and / or fresh water stored in a storage reservoir, if applicable, and / or service water at approximately room temperature is admitted into the dishwashing chamber SR for the pre-wash phase VP by means of the water inlet system (not shown) of the household dishwasher GS. During this pre-wash step, the circulating pump UP is running and pumped to the spray devices and / or liquid distribution devices such as SV, from which it is sprayed or applied in some other way to the items to be cleaned. Towards the end of the pre-wash phase VP, some or all of the dishwashing liquid is pumped out. For this purpose, a drain pump is preferably provided, which has been omitted from Figure 1 for the sake of clarity.The drain pump pumps some or all of the washing liquid out of the pump sump PS and conveys it out of the household dishwasher GS via a drain line. In the embodiment shown in Figure 4, the pre-wash step VP ends at time tVA. Then, from the start time tRS (= tVA) of the subsequent cleaning phase RP, fresh water from the fresh water supply line and / or fresh water and / or service water stored in a storage reservoir is admitted into the wash chamber SR for the cleaning phase RP via the water inlet system (not shown) and heated up to a required target cleaning temperature up to time tHA during the preferably predetermined duration tHA - tHE of a heating phase HP. The washing liquid for the cleaning step orThe cleaning phase RP is circulated in the liquid circulation circuit by means of the circulation pump UP and sprayed onto the items to be cleaned by means of its spray devices and / or liquid application devices such as SV. Detergent is preferably added to the rinsing liquid for the cleaning phase RP. Once the required cleaning temperature has been reached at time tHA, the heating of the rinsing liquid is stopped. This is followed by a so-called post-wash phase NWP, during which the rinsing liquid is only circulated in the liquid circuit by means of the running circulation pump UP and applied to the items to be cleaned by means of the spray devices and / or liquid application devices SV, but is no longer actively heated either by the desorption heating device HV or by the rinsing liquid heater WH.Shortly before the end of the cleaning step RP at time tRA, the cleaning liquid is partially or completely pumped out of the wash chamber SR by means of the drain pump (not shown). Then, at time tZS (= tRA), fresh water from the fresh water line and / or any fresh water stored in the storage reservoir and / or service water is admitted into the wash chamber SR for the subsequent intermediate rinse phase ZP via the water inlet system. This rinse liquid is then distributed in the wash chamber SR by means of the spray devices and / or liquid distribution devices such as SV. The water heater WH usually remains switched off for this intermediate rinse phase ZP. Towards the end of the intermediate rinse phase ZP at time tZE, the rinse liquid used for the intermediate rinse is again partially or completely pumped out of the wash chamber SR by means of the drain pump.Afterwards, for the final rinse phase KP following at time tKS (= tZE), fresh water from the fresh water line and / or if necessary fresh water and / or service water from the storage reservoir is again admitted into the wash chamber SR via the water inlet system. Rinse aid is preferably added to this fresh water and / or service water for the final rinse. The rinse liquid mixed with rinse aid is distributed by the circulation pump UP via the supply lines VL to the spray devices and / or liquid distribution devices or liquid application devices such as SV and applied to the washware to be cleaned in circulation mode. During the final rinse phase KP, the rinse liquid can additionally be heated to a required target rinse water temperature.Towards the end of the final rinse phase KP, the final rinse liquid is pumped out as completely as possible, preferably from the pump sump PS and thus from the wash cabinet SR, by means of the drain pump (not shown). In the exemplary embodiment of Figure 4, the final rinse phase KP then ends at time tKE. This is followed at the start time tTS (= tKE) by the drying phase TP, which concludes the wash program and ends after a preferably predetermined period of time at time tTA, which preferably corresponds to the end time tE of the respective dishwashing program.

[0038] The air conveying unit LF is switched on at least during a period of the drying phase TP, in particular at least during a period of the drying phase TP of the respective dishwashing program to be carried out, such as GP1, GP2, EP, which begins at the start of the drying phase TP. As a result, warm, humid washroom air PL is sucked from the washroom SR into the recirculation duct UK and blown through the fixed bed FS of the loose, granular, or granular, reversibly dehydratable sorption material SM to dehumidify it. The sorption material SM adsorbs water molecules from the warm, humid washroom air PL, so that the air leaving the fixed bed FS on the outlet side and being blown into the washroom SR is drier than the warm, humid washroom air PL forcibly fed to the air inlet El of the sorption container SOB.This dried air, which leaves the sorption container SB via its air outlet AU and is returned to the wash cabinet SR, is designated TL in Figure 1. Due to the continued circulation of the warm, moist wash cabinet air PL through the fixed bed FS of the sorption material SM, the wash cabinet air in the wash cabinet SR and the wash ware items accommodated therein become increasingly drier during the drying phase TP. The amount of sorption material SM is preferably such that at least the total amount of liquid adhering to the wash ware items can be largely or almost completely adsorbed by the sorption material SM during the drying phase TP. In particular, sorption drying makes it possible to partially or completely dispense with heating the final rinse liquid during the final rinse phase KP, which in particular saves electrical energy for operating the water heater WH.At least the target final rinse temperature, to which the final rinse liquid is usually heated until the end of the final rinse phase (KP) in a household dishwasher without a sorption drying system, can be lowered in the household dishwasher according to the invention with a sorption drying system. Condensation drying or self-heat drying, which relies on a sufficiently large temperature difference between the items to be washed and the boundary walls of the wash chamber (SR), is now less necessary, or even no longer necessary at all.During the drying phase, the items to be washed in the wash cabinet SR are now dried primarily by means of the sorption drying system SY. This is because the moisture is removed by adsorption from the wash cabinet air PL, which is present in the wash cabinet SR after the last liquid-carrying wash phase, in particular the final rinse phase KP, by the sorption material SM of the fixed bed FS during forced circulation through the recirculation duct UK, brought about by the air conveying unit LF. This means that the water molecules contained in the wash cabinet air PL are removed by adsorption. This saves thermal energy that would otherwise be required by converting electrical energy from the wash liquid heating orWater heating WH in at least one of the preceding partial wash phases, in particular in the final rinse phase KP as the last liquid-carrying partial wash phase, to heat the wash liquid, in particular the final rinse liquid, to a sufficiently high temperature, in particular the required target final rinse temperature, which would be necessary for proper drying of the wash ware items solely by means of condensation drying or self-heat drying. In order to regenerate the sorption material SM loaded with moisture after the drying phase of the respective dishwashing program, i.e. to make it sufficiently adsorbent again for drying warm, humid dishwashing air PL during the drying phase TP of a subsequent, in particular the next, dishwashing program, i.e.In order to make it usable for absorbing water, in a liquid-carrying partial wash phase preceding the drying phase TP, in particular in a partial wash phase with wash liquid that needs to be heated, preferably in the cleaning phase RP, of this newly carried out dishwashing program such as GP1, GP2, EP, the water molecules adsorbed by it during the drying phase of the preceding dishwashing program are expelled by heating the sorption material SM by means of the desorption heating device HV. For this purpose, the control logic LO transmits a control signal SHZ to the desorption heating device HV via a control line SL2, by means of which control signal the desorption heating device is switched on at the desired start time of the regeneration or desorption process.At least approximately at the same time, the air conveying unit LF also receives the instruction to convey wash cabinet air PL' through the recirculation duct UK at a first speed LD(HZi) from the logic unit LO by means of a control signal SLD via a control line SL1. In this way, wash cabinet air PL' is forcibly conveyed through the recirculation duct UK by means of the air conveying unit LF and heated by the switched-on desorption heating device HV, which delivers a fixed, predetermined heating output HL, before it enters the fixed bed FS. This heating of the wash cabinet air PL' circulated in the circuit between the wash cabinet SR and the sorption container SOB via the recirculation duct UK before it enters the fixed bed FS is carried out for a heating period HZi of a regeneration heating phase that is specifically or individually predetermined depending on the dishwashing program to be carried out.After this heating period HZi of the regeneration heating phase, the logic unit LO switches off the desorption heating device HV by means of a control signal SHZ via the control line SL2. In contrast, the control logic LO allows the air conveying unit LF to continue running for a period NZi of a run-on phase assigned to the heating period HZi. In particular, it may be advantageous if the control logic LO instructs the air conveying unit LF, at the time the desorption heating device HV is switched off, by means of a control signal SLD via the control line SL1 to continue forcibly conveying wash chamber air PL' through the recirculation duct UK at a second speed LD(NZi) different from the first speed LD(HZi) for the duration NZi of the run-on phase. Preferably, the speed LD(NZi) of the air conveying unit LF during the duration NZi of the run-on phase can be selected to be lower than the speed LD(HZi) of the air conveying unit during the heating phase HZi.This ensures that sensible heat, which was previously stored during the heating phase HZi by the switched off desorption heating device HV and / or by one or more components of the sorption drying system SY following it along the air flow path, such as a flow conditioning agent upstream of the inlet cross-sectional area of ​​the fixed bed, its lower sieve grid, the walls of the sorption container, the sorption material due to their respective thermal masses or heat capacities, can be transferred more effectively to the wash chamber air PL' fed to the fixed bed FS and flowing through the fixed bed FS due to its now lower flow velocity. In this way, an excessively rapid drop in the temperature in the fixed bed FS below a limit temperature, which is necessary for a sufficient degree of regeneration of the sorption material, can be counteracted.After the time period NZi of the run-on phase has elapsed, the control logic LO sends a control signal SLD via the control line SL1 to the air conveying unit LF to switch it off. The time period NZi of the run-on phase of the air conveying unit LF is preferably coordinated with the time period HZi of the regeneration heating phase of the desorption heating device HV in such a way that the sorption material SM can continue to be desorbed, i.e., regenerated, even during the run-on time period NZi of the run-on phase due to at least a portion of the thermal energy that was previously introduced into the sorption drying system SY and the rinsing chamber SR by means of the desorption heating device HV during the heating period of the regeneration heating phase.Thus, the desorption heating phase of the desorption heating device HV and the run-on phase of the air conveying unit LF complement each other to form a regeneration phase, during whose total duration LZi, which corresponds to the sum of the heating time HZi of the desorption heating phase and the run-on time NZi of the run-on phase, the regeneration of the sorption material is effected. The air returned from the fixed bed FS to the purge chamber SR transfers during the duration of the regeneration phase, ieUntil the end of the follow-up phase, a portion of the heat, in particular sensible heat, introduced into the sorption drying system SY by the desorption heating device HV during the regeneration heating phase is transferred into the wash chamber SR and heats this and the wash liquid present therein, starting from its original inlet temperature at which it was introduced into the wash chamber SR at the start of the partial wash phase, to a comparatively higher heating temperature. This saves electrical energy for the water heater WH, since during a partial wash phase with wash liquid to be heated, in particular the cleaning phase, the water heater only has to heat the wash liquid after the regeneration phase, starting from the heating temperature it has already reached, to a desired final temperature.

[0039] In order to provide a large number of dishwashing programs for the household dishwasher GS, such as GP1, GP2, EP, which differ from one another in terms of different energy efficiency levels, the invention provides that a control logic LO operates the sorption drying system SY in such a way that the dishwashing programs, at the end of their regeneration heating phases after the desorption heating device HV has been switched off, have follow-up phases of the air conveying unit LF of different lengths, during which the latter forcibly conveys wash cabinet air PL' from the wash cabinet SR through the sorption container SB.

[0040] The control logic LO, which sets the run-on time of the air conveying unit in coordination with the desorption heating time during which the desorption heating device is in operation, for the regeneration phase of the respective dishwashing program, can expediently be a component of the control / monitoring unit CO, which is provided for carrying out the various dishwashing programs. The control / monitoring unit CO and / or the control logic LO can preferably be implemented by one or more hardware components, which in particular comprise a microcomputer system with an electronic storage system, and / or by one or more software components, which can be stored in at least one electronic memory of a computer, in particular a microcomputer system, of the household dishwasher GS, and which determine the sequence of one or more rinsing steps orInclude and implement the rinsing phases and final drying phase of the respective dishwashing program. In particular, the control logic LO can be a program part or a subroutine of the sequence procedure of the respective dishwashing program to be executed, such as GP1, GP2, EP.

[0041] In order to be able to easily compare the various dishwashing programs GP1, GP2, EP of Figure 4 with regard to their energy efficiency due to different short regeneration heating times of the desorption heating device and different long run-on times of the air conveying unit LF, the start times and the end times of their partial washing phases VP, RP, ZP, KP as well as their drying phases TP are chosen to be the same for the sake of simplicity.Thus, in Figure 4, all three dishwashing programs GP1, GP2, EP have the same start time tS and the same end time tVA for their pre-wash phases VP, the same start time tRS and the same end time tRA for their cleaning phases RP, the same start time tZS and the same end time tZA for their intermediate rinse phases ZP, the same start time tKS and the same end time tKA for their final rinse phases KP, and the same start time tTS and the same end time tTA for their drying phases TP. However, this is not mandatory; the partial rinse phases VP, RP, ZP, KP and the drying phase TP of the various dishwashing programs can also differ from one another, i.e. vary, in terms of their start times, durations and end times, contrary to Figure 4. In particular, the dishwashing programs can have different program durations or program running times.

[0042] According to Figure 4, for example, a first dishwashing program GP1 can be provided in which the regeneration or desorption phase DP1 begins at the start time tRS of the cleaning phase RP. For this purpose, the control logic LO switches on the desorption heating device at time tHE = tRS for the time duration HZ1 and, in parallel, starts up the fan as an air conveying unit LF from time tLE = tHE = tRS. The fan runs at a first speed HD. The desorption heating device HV is switched off at time tHA1, while the fan continues to run at a second speed ND, which is lower than the first speed HD, for the time duration NZ1 of a run-on phase NP1 until the later time tLA1 and is only then switched off by the control logic LO. The course of the on / off state orThe operating state ZHV of the desorption heating device HV and the associated speed curve L1 of the fan are indicated by dash-dotted lines in Figure 4. During the regeneration phase DP1, the rinsing liquid in the rinsing chamber SR is heated by the air returned from the sorption container SOB to the rinsing chamber SR. Subsequently, i.e. after the end of the regeneration phase DP1 at time tLA1 - as in this example - the water heater WH can be switched on to provide support in order to further heat the rinsing liquid to a required final temperature or target cleaning temperature. The heating phase HP for heating the rinsing liquid is therefore made up of the desorption heating phase HP1 (of the running desorption heating device HV), the associated follow-up phase NP1 (of the running air conveying unit LF with the desorption heating device HV switched off), and a subsequent partial heating phase orSupplementary heating phase during which only the water heating WH is in operation.

[0043] Compared to the first dishwashing program GP1, the second dishwashing program GP2 has a shorter heating period HZ2 (< HZ1) for its desorption heating phase DP2, starting at the start of its cleaning phase RP at time tRS, during which the desorption heating device HV is in operation. The desorption heating phase DP2 begins at the start time tRS of the cleaning phase RP and now ends at an earlier time tHA2 (< tHA1). This means that the desorption heating device HV is switched on by the control logic LO at time tHE = tRS and switched off at time tHA2. However, the now shorter desorption heating phase DP2 is assigned a longer run-on phase NP2 compared to the run-on phase NP1 of the first dishwashing program GP1, which lasts from the time tHA2 when the desorption heating device HV is switched off until the time tLA2 when the fan continues to run and is then switched off by the control logic LO. This meansthe time duration NZ2 of the run-on phase NP2 is longer than the time duration NZ1 of the run-on phase NP1. The control logic LO operates the fan during the regeneration heating phase NP2 at the higher speed HD and reduces this from the switch-off time tHA2 of the desorption heating device HV to the lower speed ND for the duration NZ2 of the run-on phase NP2. The course of the on / off state or operating state ZHV of the desorption heating device HV as well as the associated speed curve L2 of the fan are indicated by solid lines in Figure 4. The third dishwashing program EP has an even shorter regeneration heating phase HP3 compared to the regeneration heating phases HP1, HP2 of the two dishwashing programs GP1, GP2. Its regeneration heating phase HP3 begins at the start time tRS of the cleaning phase RP and ends at an even earlier time tHA3 (< tHA2).The time duration HZ3 of the regeneration heating phase HP3, during which the desorption heating device HV is in operation, is therefore the shortest compared to the time durations HZ1, HZ2 of the regeneration heating phases HP1, HP2 of the dishwashing programs GP1, GP2. The following therefore applies: HZ3 < HZ2 < HZ1. As a result, the desorption heating device HV (with a fixed or constant heating output HL) releases the least amount of thermal energy to the wash cabinet air PL' supplied to the fixed bed FS for desorbing the sorption material SM during the regeneration heating phase HP3 compared to its switch-on operation during the regeneration heating phases HP1, HP2 of the other two dishwashing programs GP1, GP2, and uses the least amount of electrical energy (compared to the other two dishwashing programs GP1, GP2). The dishwashing program EP is therefore an energy-saving program.In order to ensure a sufficient degree of desorption of the sorption material SM when carrying out the energy saving program EP despite this shortening of the time period HZ3 of the desorption heating phase HP3, after the desorption heating device HV is switched off at time tHA3 (< tHA2) the fan continues to be operated during a subsequent run-on phase NP3 with an extended run-on time NZ3, which is longer than the run-on time NZ1, NZ2 of the fan during the other two dishwashing programs GP1, GP2, ie NZ3 > NZ2 > NZ1 applies.This allows a portion of the thermal energy previously introduced into the sorption drying system SY and the wash chamber SR during the regeneration heating phase NP3 by means of the desorption heating device HV to be recovered and transferred to the sorption material SM of the fixed bed FS by means of the wash chamber air PL' forced by the fan, for the extended continuation of the desorption of the sorption material SM. The control logic LO operates the fan at the higher speed HD during the regeneration heating phase NP3 and reduces this speed to the lower speed ND from the switch-off time tHA3 of the desorption heating device HV for the duration NZ3 of the run-on phase NP3. The curve of the on / off state or operating state ZHV of the desorption heating device HV and the associated speed curve L3 of the fan are indicated by dashed lines in Figure 4.

[0044] For the three dishwashing programs GP1, GP2, and EP shown in Figure 4, the control logic LO switches on the air conveying unit LF, in particular the fan, at the beginning of the drying phase TP at time tTS and allows it, in particular the fan, to run, for example, until the end time tTA of the drying phase TP with a predeterminable flow rate profile, in particular a speed profile. Deviating from this, it may be appropriate if the air conveying unit LF, in particular the fan, is only in operation temporarily during the drying phase TP.It can be particularly advantageous if the air conveying unit LF, in particular the fan, is only in operation for an initial period at the start of the drying phase TP, so that moisture and / or water vapor from the wash cabinet air forcibly conveyed by the air conveying unit LF can be adsorbed as effectively as possible by the sorption material desorbed at the start of the drying phase, and is then subsequently switched off for the remainder of the drying phase TP, in particular to avoid the risk of re-wetting of the washware items and / or to reduce the noise level of the household dishwasher over the running time of the respective dishwashing program. In Figure 4, the three dishwashing programs GP1, GP2, EP have the same start time tTE and the same end time for their respective drying phase TP, although this is not mandatory.Dishwashing programs may differ in terms of the start times, end times and duration of their drying phases.

[0045] While Figure 4 shows the duration of the heating phase HP during the cleaning phase RP of all three dishwashing programs as being the same, this is not necessarily the case. By shortening the regeneration heating period, such as HZ3 of the energy-saving program EP, the heating phase HP, supplemented by reheating via the water heater WH, may end earlier, so that the post-wash phase NWP and thus the cleaning phase RP overall can also end earlier.

[0046] In particular, in a household dishwasher with standard dimensions of its washing chamber, preferably with a width of 60 cm, a depth of 60 cm and a height of between 60 cm and 80 cm, it can be advantageous for the perfect drying of the items to be washed during the drying phase of the respective dishwashing program to be carried out by adsorption of a sufficiently large quantity of water from the dishwashing chamber air by the sorption material as well as for sufficient desorption of the sorption material during the execution of at least one partial washing phase, in particular the cleaning phase, of the next dishwashing program to be carried out, for which washing liquid has to be heated to a required target temperature, if for the sorption material e.g.Zeolite of type NAY and / or TYPE 4ABf is used and of this between 1 kg - 1.4 kg is accommodated in the sorption container SOB as a fixed bed with a bed height HS of approximately 0.06 m, and a heating output of approximately 1.45 kW (kilowatts) is provided by the desorption heating device HV. Under these circumstances, a dishwashing program which is more energy-efficient than other dishwashing programs such as GP1, GP2, i.e. an energy-saving program such as EP, can be realized in particular by operating the fan at a speed HD of approximately 7200 rpm (revolutions per minute) during the regeneration heating phase and at a reduced speed ND of approximately 4000 rpm during the run-on phase. In particular, it can be advantageous for the energy-saving program such as EP if its regeneration heating phase such asRP3 only lasts between 5 and 13 minutes, in particular approximately 8 minutes, and the run-on phase NP3 of the air conveying unit LF, in particular of the fan, lasts more than 1.5 minutes, in particular between 2 and 4 minutes, preferably approximately 2.5 minutes. This can then save a total of approximately 20 Wh - 35 Wh (watt hours) of thermal energy to be provided by the desorption heating device HV by prematurely switching off the desorption heating device in order to be able to desorb approximately 160 g of water from the fixed bed FS of the sorption material SM in an improved energy-efficient manner. For the other dishwashing programs such as GP1, GP2, it may be sufficient, in deviation from the embodiments shown in Figure 4, if the fan is operated at a lower speed HD than in the energy saving program EP, for example of approximately 5600 rpm (revolutions per minute) during the regeneration heating phase and at a lower speed ND, for exampleof approximately 4000 rpm during the run-on phase. For other dishwashing programs, such as GP1 and GP2, it may also be possible for the fan speed during the run-on time to at least approximately match the fan speed during the regeneration heat-up phase.

[0047] For the energy saving program EP, Figure 2 uses a temperature / speed diagram to illustrate in detail the desorption heating phase HP3 for the sorption material SM generated by the desorption heating device HV during its switch-on period HZ3, and the fan's run-on phase NP3, during which the desorption of the sorption material SM continues despite the desorption heating device HV being switched off. The total desorption phase DP3, during which regeneration of the sorption material SM of the fixed bed FS takes place, is therefore composed of the desorption heating phase HP3 and the run-on phase associated with it. The desorption phase DP3 thus has a total duration LZ3, which results from the sum of the duration HZ3 of the desorption heating phase HP3 and the duration NZ3 of the run-on phase NP3. The time in minutes (abbreviated "min") is plotted along the abscissa of the temperature / speed diagram.The left ordinate of the temperature / speed diagram shows the temperature T of the air TL extracted from the sorption tank SOB and fed to the wash chamber SR, as well as the dew point temperatures TP of the wash chamber air PL' drawn from the wash chamber SR into the recirculation duct UK (measured before the fixed bed) and the air TL extracted from the sorption tank SOB and fed back to the wash chamber SR, each in degrees Celsius (abbreviated to “°C”). The speeds LD of the fan are plotted on the right ordinate of the temperature / speed diagram in revolutions per minute (abbreviated to rpm). The desorption heating device HV and the fan are preferably switched on at approximately the same time tHE = tLE with the start of the cleaning phase RP of the energy saving program EP, i.e. the switch-on time tHE corresponds to the switch-on time tLE of the fan.The fan has a predetermined speed during the period HZ3 of the heating-desorption phase HP3 - here in particular of around 7200 rpm. The wash cabinet air PL' heated by the desorption heating device HV is blown by the fan through the fixed bed FS of the sorption container SOB and there, through the introduction of heat, leads to the desorption of the sorption material SM, i.e. water molecules that were adsorbed by the sorption material SM during the drying phase of the dishwashing program preceding the energy-saving program EP are released from their bond with the sorption material SM and entrained by the air flowing through the fixed bed FS and transported with it into the wash cabinet SR. In this case, from the switch-on time tHE of the desorption heating device HV orthe switch-on time tLE = tHE of the fan, which is switched on at least at about the same time, the absolute temperature of the air TL discharged from the fixed bed FS into the wash chamber SR continuously at least until time tHA3, at which time the desorption heating device HV is switched off by the control logic LO. The switching off of the desorption heating device HV at time tHA3 is indicated in Figure 2 by an event arrow EHV. This simultaneously marks the start time of the fan's run-on phase NP3 for its run-on time period NZ3. The control logic LO reduces the fan speed LD to a lower speed ND - here approximately 4000 rpm - during the time period NZ3 of the run-on phase NP3 than its speed HD specified during the regeneration heat-up phase HP3. The rising curve of the absolute temperature of the air TL discharged from the sorption container SOB into the wash chamber SR is designated AT.In this exemplary embodiment, the absolute temperature AT of the air TL forcibly conveyed from the sorption container SOB into the wash chamber SR rises from approximately 20° C to a temperature of approximately 135° C at the switch-off time tHA3 of the desorption heating device HV. After that, it rises somewhat further for a short period of time - here less than 30 seconds - to a maximum absolute temperature AT - here of approximately 140° C. This is because the fan speed is reduced from time tHA3 for the duration NZ3 of the run-on phase NP3, the volume flow rate of the wash chamber air PL' forcibly circulated through the recirculation duct UK by the fan is lower than during the regeneration heat-up phase HP3. This increases the thermal contact time orResidence time of the washroom air PL' as it flows past the desorption heating device HV, which, after it is switched off, initially releases the sensible heat stored in it due to its thermal mass to the passing air at almost the same output as before it was switched off. Only after the brief increase does the absolute temperature AT of the air TL flowing out of the sorption tank SOB and into the washroom SR slowly decrease. Here, in the embodiment of Figure 2, the air TL flowing out of the sorption tank SOB still has an absolute temperature AT of approximately 130°C at the end time tLA3 of the follow-up phase NP3 of approximately 2.5 minutes.This is due not only to the fact that the desorption heating device HV, when switched off, still transfers the sensible heat stored in it to the passing wash chamber air PL', but also to the fact that components arranged downstream of the desorption heating device HV in the recirculation duct UK in the flow direction, which were previously indirectly heated by the heated wash chamber air PL' during the desorption heating phase HP3, also transfer stored sensible heat to the wash chamber air PL' flowing past them due to their thermal masses. This can, for example, be a flow conditioning means (omitted in Figure 1 for the sake of clarity), in particular an air baffle, arranged between the desorption heating device HV and the lower sieve grid US.Due to their thermal masses, the walls of the sorption tank SB and the sorption material SM itself also transfer sensible heat to the wash chamber air PL' flowing through the fixed bed FS of the sorption tank. This allows the regeneration process of the sorption material SM, which occurs during the regeneration heating phase HP3, to continue during the follow-up phase NP3 while the desorption heating device HV is switched off, saving electrical energy.

[0048] Furthermore, the temperature / speed diagram in Figure 2 over the total duration LZ3 (= HZ3 + NZ3) of the regeneration phase DP3 of the energy saving program EP also shows the dew point curve TPE of the washroom air PL' sucked by the fan from the washroom SR into the recirculation duct UK and fed to the fixed bed FS immediately before it enters the fixed bed FS (i.e. viewed in the flow direction of the recirculation duct UK, measured at a temperature measuring point after the desorption heating device HV and before the inlet cross-sectional area of ​​the fixed bed FS) and the dew point curve TPA of the air TL flowing out of the fixed bed FS, leaving the sorption container SOB and flowing into the washroom SR. The dew point temperature TPE is a measure of the humidity contained in the washroom air PL' flowing into the fixed bed FS.The dew point temperature TPA is a measure of the moisture contained in the air TL flowing out of the fixed bed FS. Since the wash cabinet air PL' is sucked in by the fan from the wash cabinet SR into the recirculation duct UK during the phase of a partial wash cycle with wash liquid to be heated, in particular the cleaning phase RP of the cleaning cycle, of the energy saving program EP to be carried out, in which the wash liquid is distributed in the wash cabinet by means of one or more spray devices and / or other liquid application units, it is at least almost completely saturated with moisture and / or water vapor in the recirculation duct UK immediately before it enters the fixed bed FS (i.e. viewed in the flow direction of the recirculation duct UK, measured at a temperature measuring point downstream of the desorption heating device HV and upstream of the inlet cross-sectional area of ​​the fixed bed FS).Their respective dew point temperature TP therefore essentially corresponds to their absolute temperature ET upon entry into the fixed bed FS when the desorption heating device HV is switched off. The dew point curve TPA of the air TL flowing out of the fixed bed FS and leaving the sorption container SOB lies above the dew point curve TPE of the wash chamber air PL' sucked by the fan from the wash chamber SR into the recirculation duct UK and fed to the fixed bed FS immediately before its entry into the fixed bed FS (i.e. viewed in the flow direction of the recirculation duct UK, measured at a temperature measuring point downstream of the desorption heating device HV and upstream of the inlet cross-sectional area of ​​the fixed bed FS) throughout the entire duration LZ3 of the regeneration phase DP3 up to the end time tLA3 of the fan run-on phase NP3.At the end of the regeneration heating phase HP3 at time tHA3, the air TL flowing out of the fixed bed FS has a dew point temperature TPA that is ATPAE higher than the wash chamber air PL' flowing into the fixed bed FS. This temperature difference ATPAE decreases until the end of the post-run phase NP3. At the end of the post-run phase NP3, however, the dew point temperature TPA of the air TL flowing out of the fixed bed FS is still higher than the dew point temperature TPE of the wash chamber air PL' flowing into the fixed bed FS. This means that moisture can be expelled from the fixed bed FS not only during the desorption heating phase HP3, but also during the post-run phase NP3 up to its end, and the sorption material SM can be desorbed or regenerated and thus dried.During the post-run phase NP3, the absolute temperature AT of the air TL flowing out of the fixed bed FS is also greater than the dew point temperature TPE of the wash chamber air PL' flowing into the fixed bed FS. Even at the end time tLA3 of the post-run phase NP3, there is a temperature difference TAE - in the embodiment of Figure 2 of approximately 95°C - between the absolute temperature AT of the air TL flowing out of the fixed bed FS and the dew point temperature TPE of the wash chamber air PL' flowing into the fixed bed FS, which corresponds to its absolute temperature because the desorption heating device HV is switched off during the post-run phase NP3. Thus, during the post-run phase NP3, thermal energy is recovered from the sorption drying system SY and supplied to the wash chamber SR as heat input.In particular, the thermal masses of the desorption heating device HV and of one or more components of the sorption drying system SY arranged downstream of the desorption heating device in the flow direction release sensible heat previously absorbed during the regeneration heating phase HP3 to the forced-conveyed washroom air PL' during the follow-up phase NP3. This can, for example, be achieved by a flow conditioning medium (omitted in Figure 1 for the sake of clarity), in particular an air baffle, arranged between the desorption heating device HV and the lower sieve grid US, transferring stored sensible heat to the washroom air PL' flowing past it. Due to their thermal masses, the walls of the sorption container SB and the sorption material SM itself also each release sensible heat to the washroom air PL' flowing through the fixed bed FS of the sorption container.

[0049] The run-on phase NP3 therefore lasts at most until a point in time, such as tLA3 here, until the dew point temperature TPA of the air TL leaving the fixed bed FS and then the sorption container SOB is greater than the dew point temperature TPE of the wash chamber air PL' flowing into the fixed bed FS of the sorption container SOB and the absolute temperature AT of the air TL leaving the fixed bed FS and then the sorption container SOB is greater than the absolute temperature of the wash chamber air PL' flowing into the fixed bed FS.As long as the dew point temperature TPA of the air TL discharged from the fixed bed FS and then from the sorption container SOB is greater than the dew point temperature TPE of the wash chamber air PL' supplied to the fixed bed FS, moisture will continue to be expelled from the sorption material SM and dried during the post-run phase NP3 (with the desorption heating device HV switched off) following the desorption heating phase HP3, i.e. its regeneration or desorption will continue even after the regeneration heating phase HP3 during the subsequent post-run phase NP3. At the same time, heat recovery from the sorption drying system SY into the wash chamber takes place during the post-run phase NP3 as long as the absolute temperature AT of the air TL leaving the sorption container SOB is greater than the absolute temperature of the wash chamber air PL' flowing into the fixed bed FS.

[0050] Figure 3 shows a schematic representation of the flow extension HS (in meters (abbreviated to "m")), in particular the bed height extension, of the fixed bed FS of loose sorption material SM, considering the local profile TRH of the regeneration temperature TR (in °C) brought about in the sorption material SM, for example approximately at the end of the regeneration heating phase HP3 of the regeneration phase DP3 of the energy saving program EP of Figure 2, which was shortened by earlier switching off of the desorption heating device HV, in comparison to the local profile TRN of the regeneration temperature TR (in °C) brought about in the sorption material SM at the end of the run-on phase NP3 of the regeneration phase DP3 of the energy saving program EP of Figure 2, which was extended by leaving the fan switched on for a longer period.In this exemplary embodiment, the information provided above for a 60 cm wide household dishwasher is used as an example, particularly for the sorption drying system SY, which enables the energy-saving program EP to be carried out with a maximum electrical energy consumption of 630 Wh, which corresponds at least to energy label B of the energy consumption classification scheme valid in the EU from March 1, 2021. In particular, in this exemplary embodiment, the sorption material SM is zeolite of type NAY and / or type 4ABf, and in the sorption container SOB between the lower sieve grid US and the upper sieve grid OS it has a filling height of 0.06 m and a mass of approximately 1.0 - 1.4 kg. In this exemplary embodiment, the desorption heating device HV provides a heating output of approximately 1.45 kW during the regeneration heating phase DP3.The fan operates during the regeneration heating phase HP3 at a speed LD of approximately 7200 rpm and during the subsequent run-on phase NP3 at a lower speed LD of approximately 4000 rpm. At the end of the regeneration heating phase HP3, the inlet temperature ETH, at which the rinse chamber air PL' heated by the desorption heating device HV flows into the fixed bed FS, is approximately 180° C (bed height HS = 0 m) and thus lower than the limit temperature for zeolite(s) of type NAY or type 4ABf, which would lead to the almost complete expulsion of the water adsorbed by the sorption material. In the sorption material SM, the temperature curve designated TRH is established. Up to a height value HS of approximately 0.025 m of the fixed bed FS, an approximately constant regeneration temperature is achieved in the sorption material SM, which corresponds to the inlet temperature ETH of approximately 180 °C.This first section of the temperature curve TRH is designated TRH' in Figure 3. From this height value HS of 0.025 m up to the full filling height of SH = 0.06 m, the regeneration temperature TR brought about in the fixed bed FS then drops rapidly to around 70° C at a height value SH = 0.06 m. This second section of the temperature curve TRH is designated TRH" in Figure 3. This means, however, that regeneration of the sorption material SM with a higher degree of desorption only occurs approximately in the front or flow inlet side section of the fixed bed FS, here in the exemplary embodiment in particular approximately in the lower half of the fixed bed FS which extends at least approximately vertically upwards, whereas the rear orThe section of the fixed bed FS on the flow outlet side, here in the exemplary embodiment approximately the second, upper half of the fixed bed FS extending at least approximately vertically upwards, is only partially or hardly desorbed. Thus, the outlet-side region of the fixed bed FS, in particular the upper region in this exemplary embodiment, i.e., the region of the sorption material SM upstream of the downstream outlet of the fixed bed FS, is regenerated less than the inlet-side region of the fixed bed FS, in particular the lower region in this exemplary embodiment.In order to desorb as much sorption material SM as possible across the entire bed height SH of the fixed bed FS as completely as possible, it would be logical to increase the inlet temperature of the forced purge chamber air PL', at which it flows into the fixed bed FS via the inlet cross-sectional area. This would then result in a higher temperature of the sorption material in the area of ​​the outlet side of the fixed bed FS, as seen in the direction of flow, for better expulsion of the adsorbed water molecules. Surprisingly, however, it has now been shown that this is counterproductive for expelling a desired, sufficiently large amount of water from the sorption material with the least possible regeneration energy (or the corresponding thermal energy provided by the desorption heating device HV).Rather, to desorb the water quantity stored in the sorption material during the adsorption drying phase of the preceding dishwashing program, it is not advisable to increase the regeneration temperature. Conversely, a reduced reduction regeneration temperature is sufficient to expel a sufficient portion of the water quantity adsorbed during the sorption drying process of the preceding dishwashing program to dry the washware from the sorption material, down to a minimum residual moisture content of water—in this case, approximately 160 g of water. Here, in the embodiment of Figure 3, the inlet temperature of the supplied wash cabinet air PL' is reduced to the temperature value ETN = 140 °C at the end of the run-on phase NP3 by switching off the desorption heating device HV early and operating the fan with the extended run-on phase NP3.Amazingly, this temperature level of ETN = 140 °C can be achieved further locally (in the flow direction, here especially in the height direction of the fixed bed FS) than in the case of the higher inlet temperature of ETH = 180 °C viewed in the flow direction along the longitudinal extent of the fixed bed FS. Here in Figure 3, a roughly constant temperature TR of 140 °C results in the sorption material SM up to a height position HS = 0.035 m of the fixed bed. This first section of the temperature curve TRN, which is established for the lower inlet temperature of ETN = 140 °C, is designated TRN'. Only then does the temperature curve TRN decrease along its second section TRN" down to the maximum bed height value SH = 0.06 m. However, this happens later in relation to the flow extent, here especially in the height extent, of the fixed bed, i.e.only from a higher elevation HS, and also less steeply than in the case of the higher inlet temperature ETH = 180 °C of the temperature curve TRH. In the example shown in Figure 3, the temperature curve TRN intersects the temperature curve ETH shortly before the bed height SH of approximately 0.035 m. From approximately the elevation HS = 0.035 m, the temperature curve section TRN" of the curve TRN lies above the temperature curve section TRH" of the curve TRH.

[0051] Due to the extended after-run phase NP3 of the fan, the inlet temperature of the washroom air PL' supplied during the after-run phase NP3 is lowered compared to the inlet temperature of the washroom air PL' supplied during the regeneration heating phase. This is accompanied by the fact that adsorption loading sites of the sorption material SM with higher adsorption binding energies, which were already freed of water molecules during the regeneration heating phase HP3 in the inlet area of ​​the fixed bed FS, here in the embodiment of Figure 3 approximately in the first or lower half of the fixed bed FS extending at least approximately vertically upwards, by the thermally introduced energy of the desorption heating device, are reoccupied during the after-run phase with water molecules from the washroom air PL' laden with moisture and / or water vapor and forcibly conveyed through the fixed bed FS.This releases adsorption heat when water from the washroom air PL' accumulates at these adsorption loading sites of the sorption material SM with higher adsorption binding energy during the after-run phase NP3, which is transported by the air flow of the washroom air PL' in the direction of the outlet-side, here upper, front side of the fixed bed FS and there in the outlet-side area of ​​the fixed bed FS, here in the exemplary embodiment in particular in the second, upper half of the fixed bed FS, to the desorption of the sorption material, supporting the sensible heat introduced by the air flow of the washroom air PL', which is generated by the thermal masses of the switched off desorption heating device HV, a flow conditioning means arranged in front of the inlet cross-sectional area of ​​the fixed bed FS, such asan air baffle, the lower sieve grid US, the boundary walls of the sorption container SOB, and the sorption material SM itself. Ultimately, i.e. up to the end of the regeneration phase DP3, a somewhat smaller amount of water is expelled from the sorption material SM along a first inlet-side section - here approximately the first half of the vertical extent - of the fixed bed FS (in comparison to the other dishwashing programs such as GP1, GP2, whose regeneration heating phases last longer), the water is now expelled from the sorption material in the subsequent, outlet-side section, here approximately the second, upper half of the vertical extent - of the fixed bed FS more successfully than in the case of an air flow of the supplied wash cabinet air PL' with a higher inlet temperature, such as here ETH = 180 °C, if only the regeneration heating phase RP3 were to take place and no follow-up phase NP3.By lowering the inlet temperature of the air flow of the supplied washroom air PL' by means of the fan's after-run phase, the detachment of adsorbed water is specifically limited to those adsorption loading sites or binding sites of the sorption material with weaker adsorption binding energies, and this is done across the entire bed height SH of the fixed bed FS. As is illustrated by the temperature curve TRN at the end of the after-run phase NP3, viewed in the direction of flow, the heat front of the washroom air PL' forced into the fixed bed FS penetrates further along the length of the fixed bed FS at the level of the inlet temperature of 140 °C. In other words, this means that the particles orGrains of the sorption material SM are heated sufficiently so that more water molecules are released from their adsorption loading sites than in the temperature curve TRH, which occurs at different times, particularly at the end, of the regeneration heating phase HP3 (without subsequent fan run-on phase). Thus, by shortening the regeneration heating phase HP3 and the conversely extended run-on phase NP3 of the energy saving program EP, the air inlet temperature is reduced to such an extent that in the front and rear sections viewed in the direction of flow,If the adsorption loading sites of the sorption material with higher adsorption binding energy are deliberately no longer used in the inlet zone of the fixed bed, the heat energy introduced into the fixed bed FS by the air flow PL' can be transported along the flow, in particular vertical extent, of the fixed bed, particularly advantageously to the outlet end (here HS = 0.06 m) of the fixed bed, a sufficiently high heat energy can be transported, which causes a sufficiently high regeneration temperature to detach water molecules from the adsorption loading sites of the sorption material with weaker adsorption binding energy. After carrying out the regeneration phase DP3 with the shortened regeneration heating phase HP3 and the extended follow-up phase NP3, a partial desorption of the sorption material SM results, in which a more uniform, ieMore homogeneous heating of the sorption material SM across the entire bed height SH of the fixed bed FS occurs with a lower overall thermal energy consumption (compared to the case where only the heating phase HP3 were carried out without the post-run phase NP3). In particular, after the end of the post-run phase NP3 of the regeneration phase DP3 of the energy-saving program EP, a minimum residual moisture content of between 5% and 20%, in particular between 10% and 15%, based on the total dry mass of the sorption material SM, can remain in the sorption material SM.Viewed in general terms, the dishwashing programs provided, each comprising sorption drying, thus comprise at least one energy-saving program whose electrical energy consumption is lower than the electrical energy consumption of at least one of the other, in particular all other, dishwashing programs, in that its regeneration heating phase is advantageously set to be the shortest and its after-run phase to be the longest in comparison to at least one of the other, in particular all other, dishwashing programs, each comprising sorption drying.

[0052] If necessary, it may be useful for the air conveying unit LF to have an additional air outlet to the environment. This is shown in Figure 1 with a dash-dotted line and labeled AG. It can be opened and closed by means of the control / monitoring unit CO via a control line SL3 using at least one control signal SLA. The additional air outlet AG is expediently only opened during the drying phase of the respective dishwashing program. An additional amount of exhaust air ALU can then be blown out of the wash cabinet SR into the environment through the additional outlet AG, creating a negative pressure in the wash cabinet SR. As a result, ambient air UL is sucked into the wash cabinet SR through an inlet opening, such as an expansion opening in a wall of the wash tub. In Figure 1, such an inlet opening for ambient air is also shown in dash-dotted lines and labeled EO.In this way, the wash cabinet air PL is mixed with the drier ambient air in the wash cabinet, which helps the items to be washed to dry. Advantageously, the outlet AG to the environment is only opened during the drying phase such as TP of the respective dishwashing program such as GP1, GP2, EP when at least some, and in particular most, of the moisture from the warm, humid wash cabinet air PL has been adsorbed by the sorption material SM. Since the sorption material SM is sufficiently desorbed, i.e. regenerated, at the start of the drying phase TP, it can adsorb water from the warm, humid wash cabinet air particularly efficiently during an initial period of the drying phase TP. Since the wash cabinet air is then already partially dehumidified, it is advantageous to only open the additional outlet AG to the environment then.This largely prevents any moisture damage to components of the household dishwasher or to nearby kitchen units caused by the air escaping into the environment. During the regeneration phase of the respective dishwashing program, however, the additional outlet AG remains closed to prevent unwanted thermal energy loss to the environment.

Claims

PATENT CLAIMS 1. Household dishwasher (GS) with a washing chamber (SR) for receiving items to be cleaned, with a control / monitoring unit (CO) for carrying out several dishwashing programs (GP1, GP2, EP), whereby the respective Dishwashing program (GP1, GP2, EP) one or more liquid-carrying partial rinsing phases (VP, RP, ZP, KP), during which the items to be cleaned are exposed to rinsing liquid, and a drying phase (TP) concluding the washing program, and with a sorption drying system (SY), which • a recirculation duct (UK) arranged outside the washing chamber (SR), which fluidically connects an air outlet (AL) of the washing chamber (SR) with an air inlet (EL) of the washing chamber (SR), • a sorption container (SOB) fluidically inserted into the recirculating air duct (UK), in which a fixed bed (FS) of a granular or granular, reversibly dehydratable sorption material (SM) is accommodated, • an air conveying unit (LF) fluidically inserted into the recirculating air duct (UK), which, at least during a period of time, in particular the initial period of time, of the drying phase (TP) of the respective dishwashing program (GP1, GP2, EP) to be carried out, forcibly conveys warm, moist washing chamber air (PL) from the washing chamber (SR) for its dehumidification through the sorption container (SOB), and • a desorption heating device (HV) with a fixed heating power (HL) which, during a regeneration heating phase (HP1, HP2, HP3), during which the air conveying unit (LF) forcibly conveys wash chamber air (PL') through the recirculation duct (UK), and which, in at least one wash phase, in particular the cleaning phase (RP), of the respective to be carried out dishwashing program (GP1, GP2, EP), which actively heats the wash cabinet air (PL') supplied to the sorption material (SM) of the fixed bed (FS) by introducing thermal energy in such a way that the sorption material (SM) desorbs water that has been stored in the sorption material (SM) during the drying phase (TP) of the preceding dishwashing program, characterized in that a control logic (LO) operates the sorption drying system (SY) in such a way that the dishwashing programs (GP1, GP2, EP) at the end of their regeneration heating phases (HP1, HP2, HP3) after the respective switching off of the desorption heating device (HV) have follow-up phases (NP1, NP2, NP3) of the air conveying unit (LF) of different lengths, during which the latter in each case forcibly conveys wash cabinet air (PL') from the wash cabinet (SR) further through the sorption container (SOB).

2. Household dishwasher according to claim 1, characterized in that the control logic (LO) is a component of the control / monitoring unit (CO).

3. Household dishwasher according to at least one of the preceding claims, characterized in that the time duration (NZ1, NZ2, NZ3) of the after-run phase (NP1, NP2, NP3) is coordinated with the time duration (HZ1, HZ2, HZ3) of the desorption heating phase (HP1, HP2, HP3) of the respective dishwashing program (GP1, GP2, EP) in such a way that the regeneration phase (DP1, DP2, DP3) of the respective dishwashing program (GP1, GP2, EP), during which the regeneration of the sorption material (SM) can be effected, is composed of the regeneration heating phase (HP1, HP2, HP3) of the desorption heating device (HV) and the after-run phase (NP1, NP2, NP3) of the air conveying unit (LF) following this.

4. Household dishwasher according to at least one of the preceding claims, characterized in that the control logic (LO) for carrying out the regeneration phase (DP1, DP2, DP3) of the respective dishwashing program (GP1, GP2, EP) operates the air conveying unit (LF) during the time period (HZ1, HZ2, HZ3) of the regeneration heating phase (DP1, DP2, DP3) with a higher conveying volume flow (FV) of forced-feed wash cabinet air (PL') than during the time period (NZ1, NZ2, NZ3) of the subsequent run-on phase (NP1, NP2, NP3).

5. Household dishwasher according to at least one of the preceding claims, characterized in that the air conveying unit (LF) is a fan, and in that the control logic (LO) for carrying out the regeneration phase (DP1, DP2, DP3) of the respective dishwashing program (GP1, GP2, EP) sets a first speed (HD) of the fan during the time period (HZ1, HZ2, HZ3) of the regeneration heating phase (DP1, DP2, DP3) and a second speed (ND) which is lower than the first speed (HD) during the time period (NZ1, NZ2, NZ3) of the subsequent run-on phase (NP1, NP2, NP3).

6. Household dishwasher according to at least one of the preceding claims, characterized in that the run-on phase (NP1, NP2, NP3) of the air conveying unit (LF) lasts at most until a time (tDA) until which the dew point temperature (TPA) of the air (TL) leaving the fixed bed (FS) is greater than or equal to the dew point temperature (TPE) of the wash chamber air (PL') flowing into the fixed bed (FS) and the absolute temperature (AT) of the air (TL) leaving the fixed bed (FS) is greater than or equal to the absolute temperature (ET) of the wash chamber air (PL') flowing into the fixed bed (FS).

7. Household dishwasher according to at least one of the preceding claims, characterized in that for at least one energy saving program (EP) the regeneration heating phase (HP3) only lasts between 5 - 13 minutes, in particular about 8 minutes, and the after-run phase (NP3) of the air conveying unit (LF) lasts more than 1.5 minutes, in particular between 2 and 4 minutes, preferably about 2.5 minutes.

8. Household dishwasher according to at least one of the preceding claims, characterized in that at least one energy-saving program (EP) is provided, in which its regeneration heating phase (HP3) is shortened compared to the regeneration heating phase (HP1, HP2) of at least one other dishwashing program (GP1, GP2), in particular compared to the regeneration heating phases (HP1, HP2) of all other dishwashing programs (GP1, GP2), and its run-on phase (NP3) is longer than the run-on phase (NP1, NP2) of this other dishwashing program (GP1, GP2), in particular compared to the run-on phases (NP1, NP2) of all other dishwashing programs (GP1, GP2).

9. Method for operating a household dishwasher (GS), which has: a washing chamber (SR) for receiving items to be cleaned, a control / monitoring unit (CO) for carrying out a plurality of dishwashing programs (GP1, GP2, EP), wherein the respective dishwashing program (GP1, GP2, EP) comprises one or more rinsing phases (VP, RP, ZP, KP), during which the items to be cleaned are exposed to rinsing liquid, and a drying phase (TP) concluding the washing program, and a sorption drying system (SY), which • a recirculation duct (UK) arranged outside the washing chamber (SR), which fluidically connects an air outlet (AL) of the washing chamber (SR) with an air inlet (EL) of the washing chamber (SR), • a sorption container (SOB) fluidically inserted into the recirculating air duct (UK), in which a fixed bed (FS) of a granular or granular, reversibly dehydratable sorption material (SM) is accommodated, • an air conveying unit (LF) fluidically inserted into the recirculating air duct (UK), which, at least during a period of time, in particular the initial period of time, of the drying phase (TP) of the respective dishwashing program (GP1, GP2, EP) to be carried out, forcibly conveys warm, moist washing chamber air (PL) from the washing chamber (SR) for its dehumidification through the sorption container (SOB), and • a desorption heating device (HV) with a fixed predetermined heating output (HL), which at least temporarily during a regeneration phase (DP1, DP2, DP3), during which the air conveying unit (LF) forcibly conveys wash chamber air (PL') through the recirculation duct (UK) and which takes place in at least one rinsing phase, in particular the cleaning phase (RP), of the respective dishwashing program (GP1, GP2, EP) to be carried out, heats the wash chamber air (PL') supplied to the sorption material (SM) by introducing thermal energy in such a way that the sorption material (SM) desorbs water that has been stored in the sorption material (SM) during the drying phase (TP) of the temporally preceding dishwashing program, in particular according to at least one of the preceding claims, characterized in that by means of a control logic (LO) the sorption drying system (SY) is operated in such a way that the dishwashing programs (GP1, GP2,EP) at the end of their regeneration heating phases (HP1, HP2, HP3) after the respective switching off of the desorption heating device (HV) for different lengths of time, Have follow-up phases (NP1, NP2, NP3) of the air conveying unit (LF), during which it forcibly conveys wash chamber air (PL') from the wash chamber (SR) through the sorption container (SOB).

10. Method for carrying out at least one energy-saving dishwashing program (EP) of a household dishwasher (GS) having a sorption drying system (SY) which • a recirculation duct (UK) arranged outside the washing chamber (SR), which fluidically connects an air outlet (AL) of the washing chamber (SR) with an air inlet (EL) of the washing chamber (SR), • a sorption container (SOB) fluidically inserted into the recirculating air duct (UK), in which a fixed bed (FS) of a granular or granular, reversibly dehydratable sorption material (SM) is accommodated, • an air conveying unit (LF) fluidically inserted into the recirculating air duct (UK), which at least during a period of time, in particular Initial time period, the final drying phase (TP) of the wash program of the energy saving During the dishwashing program (EP), warm, moist air (PL) from the washing chamber (SR) is forced through the sorption container (SOB) for dehumidification, and • a desorption heating device (HV) with a fixed predetermined heating output (HL), by means of which, at least temporarily during a regeneration phase (DP3), during which the air conveying unit (LF) forcibly conveys wash chamber air (PL') through the recirculation duct (UK) and which is carried out in at least one wash phase, in particular the cleaning phase (RP), of the energy-saving dishwashing program (EP) to be carried out, the wash chamber air (PL') supplied to the sorption material (SM) and / or the sorption material (SOB) is heated by introducing thermal energy in such a way that water which has been stored in the sorption material (SM) during the drying phase (TP) of the preceding dishwashing program is desorbed from the sorption material (SM), in particular according to at least one of the preceding claims, characterized in that by means of a control logic (LO) the regeneration phase (DP3) of the energy saving program (EP) is carried out in such a way that its regeneration heating phase (HP3) is shortened compared to the regeneration heating phase (HP1, HP2) of at least one other dishwashing program (GP1, GP2), in particular compared to the regeneration heating phases (HP1, HP2) of all other dishwashing programs (GP1, GP2), and its run-on phase (NP3) is longer than the run-on phase (NP1, NP2) of this other dishwashing program (GP1, GP2), in particular compared to the run-on phases (NP1, NP2) of all other dishwashing programs (GP1, GP2).

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