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

Abstract

Household dishwasher (GS) with a sorption drying system (SY) and a control logic (LO) for operating dishwashing programs (GP1, GP2, EP) such that the dishwashing programs (GP1, GP2, EP) at the end of their respective regeneration heating phases (HP1, HP2, HP3) carried out by means of a desorption heating device (HV) have after-run phases (NP1, NP2, NP3) of different lengths after the respective desorption heating device (HV) is switched off, during which an air conveying unit (LF) forces wash chamber air (PL') from the wash chamber (SR) of the household dishwasher through the sorption container (SOB) of the sorption drying system (SY).

Description

[0001] The invention relates to a household dishwasher - with a washing chamber for holding 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 rinsing phases, during which the items to be cleaned are exposed to rinsing liquid, and a drying phase concluding the rinsing program, and - with a sorption drying system that • 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, • 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, • 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 • 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.

[0002] 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 its entry into the fixed bed.

[0003] 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.

[0004] 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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 adapted to each dishwashing program to be performed so that a specified energy efficiency requirement is met while simultaneously ensuring proper drying of the items to be washed. If the control / monitoring unit supports 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 the degree of soiling of the dishwashing liquid during washing of the items to be cleaned is determined, preferably by means of at least one sensor such as a turbidity sensor, and used to automatically adjust 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-time 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.

[0009] 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, which is coordinated with this, 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 only with the same, i.e. fixed or firmly set, duration for the run-on phase.

[0010] 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, even if the desorption heating device is switched off during the run-on phase.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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 specifically referred to as an Eco-Program.

[0017] 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, due to the extended after-run phase, to such an extent that the items to be washed in the wash cabinet can be dried during the program-final drying phase without the door being opened in a gap, ie the door of the dishwasher can remain completely closed during the drying phase.

[0018] Furthermore, the invention also relates to a method for operating a household dishwasher designed according to the invention according to claim 9.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] They show, in a schematic principle sketch: Fig. 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, Fig. 2 shows a schematic representation of the humidity and temperature profiles over time 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 in the 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 Fig. 1, in which the run-on phase of the air conveying unit of the sorption drying system (with the desorption heating device switched off) is extended, Fig. 3 in a schematic representation of the flow extension, in particular height extension, of the fixed bed of loose sorption material, which is in the sorption container of the sorption drying system of the household dishwasher of Fig. 1, the local course of the regeneration temperature induced in the sorption material during the regeneration phase of the energy saving program of Fig. 2 for example, approximately at the end of the shortened regeneration heating phase of the desorption heating device in comparison to the local course 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 following the regeneration heating phase of Fig. 1, during which the desorption heating device is switched off, and Fig. 4 shows schematically the different phases of the Fig. 2 example of an energy-saving dishwashing program, in which the duration of the run-on phase of its regeneration phase is extended compared to other selectable, less energy-efficient dishwashing programs.

[0023] Elements with the same function and mode of operation are provided with the same reference numerals in the figures.

[0024] Fig. 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.

[0025] The domestic dishwasher GS has a wash chamber SR for accommodating 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-side one. This is shown in the schematic front view of the Fig. 1 has been omitted for the sake of simplicity of the drawing. The boundary walls of the washing container SB are, for an operator standing in front of the household dishwasher GS for its intended use, in particular a left-hand side wall, a right-hand side wall, a ceiling wall, a floor wall and a rear wall. In the washing chamber SR, one or more holding units are provided for holding the items to be cleaned, in particular a lower crockery basket, an upper crockery basket and / or a cutlery drawer preferably arranged above the upper crockery basket. The latter is omitted for the sake of clarity of the drawing or for reasons of space. Fig. 1 omitted. To apply washing liquid to the items placed in the receiving units, one or more spray devices and / or other liquid distribution devices are provided in the wash cabinet SR. These can include, in particular, rotatable spray arms, an upper roof spray or an upper roof gyroscope, and / or other liquid application devices, such as spray units specifically attached to one or more dish baskets. Fig. 1, a lower and an upper rotatable spray arm SV are shown in simplified form in the wash cabinet SR as representatives of the liquid application means, as well as a lower crockery basket UB and an upper crockery basket OB as representatives of the storage units for 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 washing operation of the household dishwasher during one or more different washing phases of the respective dishwashing program, washing liquid is supplied by means of a Fig. 1 The water inlet system (omitted for simplicity of the drawing) is let into the wash chamber SR. The wash liquid is pumped by means of a circulation pump UP via one or more liquid lines VL to the spray devices and / or liquid distribution devices such as SV and sprayed from there onto the items to be cleaned in the holding units. The wash liquid drips to the floor and collects in a pump sump or pump pot PS, which is provided below the bottom wall of the wash container SB. From the pump sump PS, the circulation pump UP sucks the wash liquid, 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 asa water diverter for selectively controlling the respective fluid line, which leads separately to the respective spray device and / or fluid distribution device. Furthermore, a fluid heater or water heater WH is provided in the fluid circulation circuit, in particular, in order to heat the rinsing fluid to a desired heating temperature or target heating temperature as needed. In this embodiment, . Fig. 1, the liquid heater WH is preferably assigned to the circulation pump UP. In particular, the liquid heater is housed within the circulation pump, i.e., the circulation pump UP is preferably designed as a heating pump.

[0026] The sorption drying system SY has a recirculation duct UK located outside the wash cabinet SR. This recirculation duct ÙK fluidically connects an air outlet AL of the wash cabinet SR with an air inlet EL of the wash cabinet SR. For example, the air outlet AL can be a through-opening in a side wall - as in the exemplary embodiment of Fig. 1 viewed from the front in the right-hand side wall - of the washing container SB and as an air inlet EL a through opening preferably in a different boundary wall of the washing chamber SR - here in the embodiment of Fig. 1 in the bottom wall of the rinsing tank SB - be provided. A sorption tank SOB is fluidically inserted into the recirculation duct UK. In this embodiment, this is preferably cylindrical, in particular circular-cylindrical. In this embodiment, it extends preferably at least approximately in the vertical direction. Its interior is filled, between a lower sieve grid US and an upper sieve grid OS, with a fixed bed FS of a loose, granular and / or granular, reversibly dehydratable sorption material SM. Thus, in this 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 in the vertical direction. 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 recirculation duct UK, from bottom to top, in particular essentially in a vertical direction against the direction of gravity. Its geometric shape and orientation largely ensure that, viewed over its vertical extent up to its specified maximum bed height SH, at each height point HS it has a largely uniform or homogeneous passage cross-sectional area occupied by the loose sorption material SM and that this distribution of the loose sorption material SM is also permanently maintained over the operating life of the household dishwasher GS. The grains and / or granulate particles of the sorption material SM can preferably each be spherical.These sorption material beads, on the one hand, increase the thermal contact area of ​​the sorption material for air that is blown through gaps between the sorption material beads. 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 at least approximately vertical flow direction from bottom to top and thus, in this embodiment, at least approximately horizontally arranged, over its bed height SH, over its bed height SH. A first air duct section LK1 of the recirculation duct UK runs between the air outlet AL of the rinsing chamber SR and the air inlet EI 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 recirculation duct UK between the air outlet AL of the wash cabinet SR and the air inlet EI of the sorption container SOB, upstream of the sorption container SOB, in the flow direction of the forced-feed wash cabinet air. The air conveying unit LF is shown in the exemplary embodiment in FIG. Fig. 1 is expediently formed 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 to the sorption container SOB and via its lower air inlet EI into the wash chamber SOB. There, the forced-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 forced-conveyed wash chamber air through the fixed bed FS leaves the sorption container SOB via its upper air outlet AU and is either directly or, as in the exemplary embodiment here, by Fig. 1 via a second air duct section LK2 of the recirculation duct UK into the air inlet EL of the wash chamber SR. If the air conveying unit LF is switched on, it sucks air from the wash chamber SR via its air outlet AL into the recirculation duct UK and then blows this air 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 wash chamber SR via the air inlet EL. In this way, air from the wash chamber (i.e. wash chamber 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 chamber SR when the air conveying unit LF is switched on. The forced air flow generated 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 in the Fig. 1 indicated by directional arrows ZLS.

[0027] 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 here in the embodiment of Fig. 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, in front of the fixed bed FS of the sorption material SM in an inlet-side area 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 Fig. 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 there by a tubular heater, the windings of which are expediently arranged in a common, here in particular horizontal, plane. The forced-conveyed wash chamber air PL' can preferably flow through gaps or 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, associated with this, the desired heating of the latter before it enters the fixed bed FS. Alternatively, the desorption heating device HV can, if necessary,be designed as an electric wire heater, past which the forced-conveyed wash chamber air PL' flows by means of the air conveying unit LF and is heated before entering the fixed bed FS. This electric wire heater can, if necessary, be 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 means of 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 the heated air PL' acts on the inlet-side end face, 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.

[0028] The GS household dishwasher includes a control / monitoring unit CO for executing multiple dishwashing programs. Each dishwashing program includes 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. Fig. Figure 4 illustrates, by way of example, the timing of the partial wash phases for three different dishwashing programs GP1, GP2, EP, namely a pre-wash phase VP, a cleaning phase RP, an intermediate wash phase ZP, and a final rinse phase KP. The latter is followed by the drying phase TP, which concludes the wash program. With regard to these partial phases of the respective dishwashing program GP1, GP2, EP, the upper half of the figure shows Fig. 4 shows a state diagram for the operating state of the desorption heating device HV and, below it in the lower half of the figure, a speed diagram for a fan as an 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.

[0029] Firstly, 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 washing 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 water is pumped by means of the running circulation pump UP to the spray devices and / or liquid distribution devices such as SV and sprayed or otherwise applied to the items to be cleaned. Towards the end of the pre-wash phase VP, the washing liquid is partially or completely pumped out. For this purpose, a drain pump is preferably provided, which is located in the Fig. 1 has been omitted for clarity. The drain pump partially or completely pumps the washing liquid out of the pump sump PS and conveys it out of the household dishwasher GS via a drain line. The pre-wash step VP ends in the embodiment of Fig. 4 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 process water stored in a storage reservoir, if applicable, is admitted into the wash chamber SR for the cleaning phase RP via the water inlet system (not shown) and heated to a required target cleaning temperature up to time tHA during the preferably predetermined duration tHA - tHE of a heating phase HP. Preferably, even during the water inlet and heating up, the washing liquid for the cleaning step or 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 washing 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 by either the desorption heating device HV or 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 rinsing chamber SR by means of the drain pump (not shown). Fresh water from the fresh water line and / or if necessary from the fresh water supply is then pumped into the rinsing chamber SR at time tZS (= tRA) via the water inlet system.Fresh water and / or service water stored in the storage reservoir is admitted to the wash chamber SR for the subsequent intermediate rinse phase ZP. This rinse liquid is in turn distributed in the wash chamber SR by means of the spray devices and / or liquid distribution devices such as SV. For this intermediate rinse phase ZP, the water heater WH usually remains switched off. At 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 pipe and / or if necessary fresh water and / or service water from the storage reservoir is again admitted to 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 dishes to be cleaned in circulation mode. During the rinse phase KP, the rinse liquid can additionally be heated to a required target rinse water temperature. Towards the end of the rinse phase KP, the rinse aid liquid is pumped out as completely as possible from the pump sump PS and thus from the rinse chamber SR using the drain pump (not shown). In the embodiment of . Fig. 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 dishwashing 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.

[0030] 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 EI of the sorption container SOB.This dried air leaving the sorption container SB via its air outlet AU and returned to the rinsing chamber SR is in the . Fig. 1 designated TL. Due to the continued circulation of the warm, moist wash cabinet air PL through the fixed bed FS of 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 or even no longer necessary.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 would have to be applied in at least one of the preceding partial rinsing phases, in particular in the final rinsing phase KP as the last liquid-carrying partial rinsing phase, to heat the rinsing liquid, in particular the final rinsing liquid, to a sufficiently high temperature, in particular the required target final rinsing temperature, which would be necessary for proper drying of the items to be washed solely by means of condensation drying or self-heat drying.

[0031] In order to regenerate the sorption material SM loaded with moisture after the drying phase of the respective dishwashing program being carried out, i.e. to make it sufficiently adsorbable again, i.e. usable for absorbing water, for drying warm, moist dishwashing air PL during the drying phase TP of a subsequent, in particular next, dishwashing program, the water molecules adsorbed by it during the drying phase of the previous dishwashing program are expelled by heating the sorption material SM by means of the desorption heating device HV in a liquid-carrying partial wash phase preceding the drying phase TP, in particular in a partial wash phase with wash liquid to be heated, preferably in the cleaning phase RP, of this newly carried out dishwashing program such as GP1, GP2, EP.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 the 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 washroom air PL' through the recirculation duct UK at a first speed LD(HZi) from the logic unit LO via a control signal SLD via a control line SL1. In this way, washroom air PL' is forcibly conveyed through the recirculation duct UK by means of the air conveying unit LF and is heated by the switched-on desorption heating device HV, which delivers a fixed heating output HL, before entering the fixed bed FS.This heating of the wash chamber air PL', which is circulated in the circuit between the wash chamber 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 that is assigned to the heating period HZi. In particular,It can be advantageous if the control logic LO instructs the air conveying unit LF, by means of a control signal SLD via the control line SL1, at the time the desorption heating device HV is switched off, to continue to forcibly convey 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 after-run phase. Preferably, the speed LD(NZi) of the air conveying unit LF during the duration NZi of the after-run phase can be selected to be lower than the speed LD(HZi) of the air conveying unit during the heating-up phase HZi. This ensures that sensible heat generated 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 asa flow conditioning agent in front 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, previously stored during the heating phase HZi, to which the flushing chamber air PL' conveyed to the fixed bed FS and flowing through the fixed bed FS can be transferred more effectively 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 expiration of the time period NZi of the follow-up phase, 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 duration NZi of the run-on phase of the air conveying unit LF is preferably coordinated with the duration HZi of the regeneration heating phase of the desorption heating device HV in such a way that the sorption material SM can be further desorbed, i.e. regenerated, even during the run-on time 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 period 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.During the regeneration phase, i.e. until the end of the follow-up phase, the air returned from the fixed bed FS to the wash chamber SR transfers 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 into the wash chamber SR. This heats the wash chamber 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 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 from the heating temperature it has already reached to a desired final temperature.

[0032] 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.

[0033] 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.

[0034] To use the different dishwasher programs GP1, GP2, EP from Fig. 4 in terms of 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 and end times of their partial rinsing phases VP, RP, ZP, KP as well as their drying phases TP are chosen to be the same. Fig. 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 deviate from Fig. 4 may also differ from one another, i.e., vary, with regard to their start times, durations, and end times. In particular, the dishwasher programs may have different program durations or program running times.

[0035] According to the Fig. 4, for example, a first dishwashing program GP1 can be provided, in which the regeneration or desorption phase DP1 begins with 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 duration HZ1 and, in parallel, from time tLE = tHE = tRS, starts operating the fan as an air conveying unit LF. This 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 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 or operating state ZHV of the desorption heating device HV as well as the associated speed profile L1 of the fan are shown in the Fig. 4 by dash-dotted lines. 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, the water heater WH can be switched on to provide support if necessary - as in the exemplary embodiment here - 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 thus consists 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 or supplementary heating phase during which only the water heater WH is in operation.

[0036] 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 time tRS from the beginning of its cleaning phase RP, 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 duration NZ2 of the run-on phase NP2 is longer than the duration NZ1 of the run-on phase NP1. The control logic LO operates the fan at the higher speed HD during the regeneration heating phase NP2 and reduces this speed to the lower speed ND from the switch-off time tHA2 of the desorption heating device HV for the duration NZ2 of the run-on phase NP2. The progression of the on / off state or operating state ZHV of the desorption heating device HV as well as the associated speed progression L2 of the fan are shown in the . Fig. 4 marked by solid lines.

[0037] The third dishwashing program EP has an even shorter regeneration heating phase HP3 than the regeneration heating phases HP1 and HP2 of the two dishwashing programs GP1 and 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 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 durations HZ1 and HZ2 of the regeneration heating phases HP1 and HP2 of the dishwashing programs GP1 and GP2. HZ3 < HZ2 < HZ1 therefore applies. The desorption heating device HV therefore (at a fixed orAt constant heating power HL, during the regeneration heating phase HP3, the program transfers the least amount of thermal energy to the wash chamber air PL' supplied to the fixed bed FS for desorbing the sorption material SM 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 duration 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 means that part of the thermal energy previously introduced into the sorption drying system SY and into the wash chamber SR during the regeneration heating phase NP3 with the help of the desorption heating device HV can 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 to prolong the desorption of the sorption material SM. The control logic LO operates the fan during the regeneration heating phase NP3 at the higher speed HD and reduces this from the switch-off time tHA3 of the desorption heating device HV to the lower speed ND 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 as well as the associated speed curve L3 of the fan are shown in the . Fig. 4 marked by dashed lines.

[0038] In the three dishwasher programs GP1, GP2, EP from Fig. 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 expedient 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 means of 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 switched off for the remainder of the drying phase TP, in particular in order to avoid the risk of the items to be washed becoming moist again and / or to reduce the noise level of the household dishwasher over the running time of the respective dishwashing program. Fig. 4, the three dishwashing programs GP1, GP2, and EP have the same start time tTE and the same end time for their respective drying phases TP, although this is not mandatory. The dishwashing programs may differ from one another with regard to the start times, end times, and durations of their drying phases.

[0039] If in the Fig. 4 While the duration of the heating phase HP during the cleaning phase RP of all three dishwashing programs is shown to be the same, this is also not mandatory. By shortening the regeneration heating time, such as HZ3 of the energy-saving program EP, the heating phase HP, supplemented by reheating using 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.

[0040] 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 between 1 kg - 1.4 kg of this 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 more energy-efficient dishwashing program 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 - 13 minutes, in particular around 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 around 2.5 minutes. This can then save a total of around 20 Wh - 35 Wh (watt hours) of thermal energy to be provided by the desorption heating device HV by switching off the desorption heating device prematurely in order to be able to desorb around 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 differ from the ones in the . Fig. 4 may be sufficient if the fan is operated at a lower speed HD than in the energy-saving program EP, for example, approximately 5600 rpm (revolutions per minute) during the regeneration heating phase, and at a lower speed ND, for example, approximately 4000 rpm, during the run-on phase. For the other dishwashing programs, such as GP1 and GP2, it may also be possible for the fan speed during the run-on time to be at least approximately the same as the fan speed during the regeneration heating phase.

[0041] Fig. Figure 2 illustrates in detail, for the energy saving program EP, using a temperature / speed diagram, 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 orFrom the switch-on time tLE = tHE of the fan, which is switched on at least approximately at the same time, the absolute temperature of the air TL discharged from the fixed bed FS into the wash chamber SR is continuously measured at least until time tHA3, at which 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 defined in the . Fig. 2 is marked by an event arrow EHV. This simultaneously marks the start time of the fan's run-on phase NP3 for its run-on time NZ3. The control logic LO reduces the fan speed LD to a lower speed ND - here approximately 4000 rpm - compared to the fan speed HD specified during the regeneration heat-up phase HP3 during the time period NZ3 of the run-on phase NP3. The rising curve of the absolute temperature TL of the air discharged from the sorption tank 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 tank 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.It then rises slightly 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, meaning the volume flow rate of the wash chamber air PL' forced through the recirculation duct UK by the fan is lower than during the regeneration heat-up phase HP3. This increases the thermal contact time or residence time of the wash chamber 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 short-term increase does the absolute temperature AT of the air TL flowing out of the sorption container SOB and into the wash chamber SR slowly decrease.Here in the example of . Fig. 2, the air TL flowing out of the sorption container SOB still has an absolute temperature AT of approximately 130°C at the end time tLA3 of the run-on phase NP3 of approximately 2.5 minutes. This is due to the fact that not only the switched off desorption heating device HV transfers the sensible heat still stored in it to the passing washroom air PL', but also components arranged downstream of the desorption heating device HV in the recirculation duct UK in the flow direction, which were previously heated by the heated washroom air PL' during the desorption heating phase HP3, also transfer stored sensible heat to the washroom air PL' flowing past them due to their thermal masses. This can be achieved, for example, by a flow conditioning agent (in Fig. 1 omitted for clarity), especially the air baffle. 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 be continued during the follow-up phase NP3 while the desorption heating device HV is switched off, saving electrical energy.

[0042] Furthermore, the temperature / speed diagram of Fig. 2 over the entire duration LZ3 (= HZ3 + NZ3) of the regeneration phase DP3 of the energy saving program EP, in addition 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 ΔTPAE higher than the wash chamber air PL' flowing into the fixed bed FS. This temperature difference ΔTPAE 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 run-on 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 run-on phase NP3, there is a temperature difference TAE - in the example of . Fig. 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 follow-up phase NP3. Thus, during the follow-up 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 wash chamber air PL' during the follow-up phase NP3. This can, for example,a flow conditioning means (in .) arranged between the desorption heating device HV and the lower sieve grid US. Fig. 1 (omitted for clarity), in particular the air baffle, 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 transfer sensible heat to the washroom air PL' flowing through the fixed bed FS of the sorption container.

[0043] The run-on phase NP3 therefore lasts at most until a point in time, such as tLA3 here, until which 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.

[0044] The Fig. 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 course TRH of the regeneration temperature TR (in °C) caused 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, which was shortened by earlier switching off of the desorption heating device HV. Fig. 2 in comparison with the local course TRN of the regeneration temperature TR (in °C) caused 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, which was extended by leaving the fan switched on for a longer period of time. Fig. 2. In this exemplary embodiment, the specifications of the sorption drying system SY provided above for a 60 cm wide household dishwasher are used as an example. These specifications enable the implementation of the energy-saving program EP, in particular 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 bed 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 shown in the . Fig. 3 is designated TRH'. From this height value HS of 0.025 m up to the full bed height of SH = 0.06 m, the regeneration temperature TR caused in the fixed bed FS drops rapidly to about 70° C at the height value SH = 0.06 m. This second section of the temperature curve TRH is shown in the Fig. 3 with TRH". However, this means that only in the front or flow inlet side section of the fixed bed FS, here in the exemplary embodiment in particular in the lower half of the fixed bed FS extending at least approximately vertically upwards, a regeneration of the sorption material SM with a higher degree of desorption occurs, while the rear or flow outlet side section of the fixed bed FS viewed in the flow direction, 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, in particular here in the exemplary embodiment upper, area of ​​the fixed bed FS, iethe area of ​​the sorption material SM in front of the downstream outlet of the fixed bed FS is regenerated less than the inlet-side area of ​​the fixed bed FS, in particular the lower area of ​​the fixed bed FS in this example. In order to desorb as much sorption material SM as possible over 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', with which it flows into the fixed bed FS via the inlet cross-sectional area, in the expectation that this will then also result in a higher temperature of the sorption material in the area of ​​the outlet-side area of ​​the fixed bed FS, viewed 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 amount of water stored in the sorption material during the adsorption drying phase of the preceding dishwashing program, it is not advisable to increase the regeneration temperature. Instead, a reduced reduction regeneration temperature is sufficient to expel a sufficient portion of the water adsorbed during the adsorption drying process of the preceding dishwashing program to dry the washware from the sorption material, down to a minimum residual moisture content—in this case, approximately 160 g of water.Here in the example of . Fig. 3, the inlet temperature of the supplied washroom 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. Surprisingly, this temperature level of ETN = 140 °C can then 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 the Fig. 3, a roughly constant temperature TR of 140 °C in the sorption material SM results 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'' up to the maximum bed height value SH = 0.06 m. However, this happens later in relation to the flow extension, here in particular the height extension, of the fixed bed, ie only from a greater height position HS, and also less steeply than in the case of the higher inlet temperature ETH = 180 °C of the temperature curve TRH. The temperature curve TRN intersects here in the embodiment of Fig. 3 the temperature curve ETH shortly before the bed height value SH of about 0.035 m. From about the height extension value HS = 0.035 m, the temperature profile section TRN'' of the curve TRN lies above the temperature profile section TRH'' of the curve TRH.

[0045] Due to the extended fan run-on phase NP3, the inlet temperature of the wash chamber air PL' supplied during the run-on phase NP3 is reduced compared to the inlet temperature of the wash chamber 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 are already present during the regeneration heating phase HP3 in the inlet area of ​​the fixed bed FS, here in the embodiment of Fig. 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, were freed from water molecules, during the follow-up phase are again occupied with water molecules from the wash chamber air PL' loaded with moisture and / or water vapor, which is 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 towards 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 follow-up phase NP3). In particular, after the end of the follow-up 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.

[0046] 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.

[0047] It may be useful if the air conveying unit LF has an additional air outlet to the environment. This is shown in the Fig. 1 is shown in dash-dotted lines 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. Through the additional outlet AG, an additional amount of exhaust air ALU can then be blown out of the wash cabinet SR into the environment, 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. Fig.1, such an inlet opening for ambient air is additionally 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 assists the drying of the wash items. 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 air in the dishwasher is already partially dehumidified, it is advisable to open the additional outlet (AG) to the outside only then. This largely prevents any moisture damage to the components of the dishwasher or to neighboring kitchen units caused by the air escaping into the outside.

[0048] During the regeneration phase of the respective dishwashing program, however, the additional output AG remains closed to avoid unwanted thermal energy losses to the environment.

Claims

[1] Household dishwasher (GS) - with a washing chamber (SR) for holding 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) comprises 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 dishwashing program, and - with a sorption drying system (SY) that • 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 output (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 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, actively heats the wash chamber 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 which has been stored in the sorption material (SM) during the drying phase (TP) of the preceding dishwashing program, characterized bythat 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 different lengths of follow-up phases (NP1, NP2, NP3) of the air conveying unit (LF), during which said unit forcibly conveys wash cabinet air (PL') from the wash cabinet (SR) through the sorption container (SOB). [2] Household dishwasher according to claim 1, characterized by that the control logic (LO) is part of the control / monitoring unit (CO). [3] Household dishwasher according to at least one of the preceding claims, characterized bythat the time duration (NZ1, NZ2, NZ3) of the after-run phase (NP1, NP2, NP3) is matched to 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 bythat 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 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 period (NZ1, NZ2, NZ3) of the subsequent follow-up phase (NP1, NP2, NP3). [5] Household dishwasher according to at least one of the preceding claims, characterized bythat the air conveying unit (LF) is a fan, and that the control logic (LO) for carrying out the regeneration phase (DP1, DP2, DP3) of the respective dishwashing program (GP1, GP2, EP) determines 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 bythat the run-on phase (NP1, NP2, NP3) of the air conveying unit (LF) lasts at most until a point in time (tDA) up to 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 by 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 run-on 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 by 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), comprising: - a washing chamber (SR) for holding items to be cleaned, - a control / monitoring unit (CO) for carrying out several dishwashing programs (GP1, GP2, EP), whereby 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 dishwashing program, and - a sorption drying system (SY) that • 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 bythat the sorption drying system (SY) is operated by means of a control logic (LO) 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 different lengths of follow-up phases (NP1, NP2, NP3) of the air conveying unit (LF), during which said unit forcibly conveys wash cabinet air (PL') from the wash cabinet (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 the initial period of time, of the drying phase (TP) concluding the washing program of the energy-saving dishwashing program (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), 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 bythat 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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