DE102013224951A1 - household appliance - Google Patents

Abstract

The invention relates to a domestic appliance (1, 51) which comprises a plurality of walls (4, 5, 6, 56, 57, 65) delimiting an interior space (3, 53), the surfaces (4a, 4b) facing the interior space (3, 53) , 5a, 6a, 56a, 57a). At least a part of the surfaces (4a, 5a, 6a, 56a, 57a) is formed such that water droplets (11, 66) forming on this part of the surfaces (4a, 5a, 6a, 56a, 57a) have a retraction angle of at least 60 ° have. Additionally or alternatively, within the interior (3) a component (24a) of the household appliance (1) is arranged, which has a further surface (25), wherein at least a part of the further surface (25) is formed such that on this part of further surface (25) forming water droplets (11) have a retraction angle of at least 40 °. The invention also relates to a domestic appliance (1, 71) which has a heat exchanger, in particular an evaporator (24, 84) of a refrigerant circuit (20, 80), which has a surface (25, 85), at least a part of the surface ( 25, 85) of the heat exchanger is designed such that on this part of the surface (25, 85) of the heat exchanger forming water droplets (11) have a retreat angle of at least 40 °.

Description

The invention relates to a household appliance, in particular with an interior.

An example of a household appliance with an interior is a household refrigerator, which has an inner container, which limits a provided for storing food, cooled by means of a refrigerant circuit interior. In particular, in refrigerators of household refrigerators may be incurred undesirable amounts of condensate. This condensate forms z. On glass plates, from where it can drip onto the stored food, or in other storage areas of the household refrigerating appliance, such as e.g. Drawers. By opening a provided for closing the coolable interior door panel and associated air exchange with the installation room of the household refrigerator, caused, but also by stored food, such. Leafy vegetables, moisture in the form of water gas can enter the coolable interior.

The condensation of the water gas takes place in particular at the points at which the dew point of the air located there is below. If the actively cooled evaporator of the refrigerant circuit is arranged in the coolable interior, this effect is indirectly utilized. This removes water from the coolable interior by condensing the moist air at the evaporator and leads it out of the coolable interior to the outside.

Especially due to the increase in efficiency prevail on the evaporators always higher temperatures than household refrigerators with lower energy efficiency. This reduces the temperature difference between the evaporator, the surrounding air and the remaining components of the inner container. Thus, the effectiveness of the evaporator sinks as a cold sink. This results in an at least partial transfer of condensation from the evaporator, e.g. to shelves of the household refrigerator.

One measure for dehumidifying the coolable interior is the targeted condensation on the evaporators. Through targeted ventilation an air flow is generated, which generates an increased condensation on the evaporator. Thus, a reduction of the relative humidity of the air in the inner container is achieved and thus the condensation e.g. reduced at the shelves. The condensate on the evaporator is e.g. derived via a trough in an evaporation tray in the engine room of the household refrigerator and thus avoided increased water accumulation in the coolable interior.

Another example of a household appliance with an interior is a household dishwasher that includes a washing container that confines the interior. The interior of the household dishwasher is provided for loading items to be washed. During operation of the domestic dishwasher, water drops may form on the surfaces of the washing container facing the interior due to condensation, in particular during drying of the rinsed items to be washed.

Object of the present invention is to carry out a household appliance with an interior such that the condensation rate of certain, facing the interior surfaces and / or that the condensation rate is increased on the surface of a disposed within the interior of the household appliance component.

The object of the invention is achieved by a domestic appliance, comprising a plurality of walls delimiting an interior, the surfaces facing the interior, of which at least a part of the surfaces is formed such that on this part of the surfaces forming water droplets a retraction angle of at least 40th °, and / or in which within the interior of a component is arranged as part of the household appliance, which has a further surface, wherein at least a portion of the further surface is formed such that on this part of the further surface forming water droplets a retreat angle of at least 40 °.

Another aspect of the invention relates to a domestic appliance, comprising a heat exchanger, in particular an evaporator of a refrigerant circuit having a surface (wherein at least a part of the surface of the heat exchanger is formed such that on this part of the surface of the heat exchanger forming water droplets a retreat angle of at least 40 °.

According to an advantageous variant of the household appliance according to the invention, the part of the surfaces and / or the further surface and / or the surface of the heat exchanger is designed such that water droplets forming on this part of the surfaces or the further surface have a retraction angle of at least 60 °, in particular of at least 70 °, preferably of at least 80 °.

The part of the surfaces is preferably an actively cooled surface, e.g. the surface of an evaporator.

According to one embodiment of the household appliance according to the invention, the walls of the interior comprise two side walls, a rear wall and a ceiling, wherein at least part of the surfaces of at least one of the side walls and / or the rear wall is formed in such a way that drops of water formed there have a retraction angle of at least 40 ° , in particular at least 60 °, in particular of at least 70 °, preferably at least 80 °.

The household appliance according to the invention is e.g. a household refrigerator, preferably a household refrigerator. The household refrigerator or household refrigerator comprises a refrigerant circuit with an evaporator for cooling the interior and a heat-insulated body with an inner container having the surfaces, wherein the interior is provided for storing food. According to this variant, the interior space is thus a coolable interior, which is limited by the surfaces of the inner container. At least a portion of these surfaces are formed so that forming water droplets have a retraction angle of at least 40 °. The domestic refrigerator or household refrigerator may e.g. a hinged door leaf to close and open the coolable interior.

The evaporator may e.g. be arranged behind the surface of the inner container, which is at least partially formed such that water droplets forming there have a retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably at least 80 °. The inner container may have a rear wall, a ceiling and two side walls. The evaporator is preferably arranged behind the rear wall. It can also be arranged behind at least one of the side walls and / or extend at least partially behind the ceiling. The part of the surface of the inner container, behind which the evaporator is arranged, thus represents an actively cooled surface. The corresponding wall preferably comprises a gutter, which is intended to collect on the corresponding wall forming water droplets and to lead out of the coolable interior ,

The inner container of the household appliance according to the invention designed as a domestic refrigerator or appliance may have at least one vertical wall and the evaporator may be designed as a planar evaporator, e.g. be designed as a Rollbond evaporator, which is spaced from the vertical wall within the coolable interior and having a surface which is at least partially formed such that water droplets forming there at a retraction angle of at least 40 °, in particular of at least 60th °, in particular of at least 70 °, preferably at least 80 °. This planar evaporator is thus an example of the arranged inside the component of the household appliance according to the invention, which comprises the further surface. However, the planar evaporator is also a heat exchanger. The planar evaporator is e.g. a rollbond evaporator. The vertical wall is e.g. the back wall or one of the side walls and in particular comprises the gutter.

Characterized in that according to the invention, the surface or the further surface is formed such that water droplets forming there have a retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably at least 80 °, the condensation rate, ie the amount of condensate per time or condensation surface on the corresponding surface, for example, the evaporators or actively cooled surfaces, such as the surfaces of the inner container, even at relatively high surface temperatures improved. For example, e.g. a lower subcooling (ie temperature difference) particularly advantageous in the case of droplet condensation, because here the spontaneous formation of condensation nuclei on the surface does not take place to such a high degree, as in the stronger supercooling. This lower supercooling thus causes the merger of smallest water droplets is less hindered by the newly formed germs and thus a larger heat exchanger surface is present, which in turn has a positive effect on the efficiency of the household refrigerator.

The retraction angle selected according to the invention can also serve to increase the efficiency, but also to reduce the humidity of the room air of the household refrigerator according to the invention

The basis for a relatively highly efficient function of an evaporator is preferably a relatively good heat transfer at the evaporator surface / air interface. In practice, this transition is inhibited by condensate, which is present in the form of large-scale, slowly draining drops of water. These drops of water can significantly reduce the heat transfer and thereby reduce the active surface of the evaporator. In addition, in the case of the whereabouts or a relatively slow-running condensate, the risk of icing of the water droplets on the surface of the evaporator, so that the active, available for cooling surface of the evaporator is at least temporarily reduced and the efficiency of a household cooling appliance decreases. Targeted avoidance of crosslinking and / or graining on the surface of the evaporator would provide a durable and relatively high condensation rate on the evaporator and thus at least reduce the problem of unwanted condensation, for example, on shelves designed as glass plates.

An influencing factor for the described increase in efficiency is the wetting behavior of the capacitor surface, namely the contact angle and in particular the retraction angle. The contact angle for water droplets of the coated surface of the evaporator conventional household refrigerators is about 80-85 °, and thus at the limit of hydrophobic properties.

Essentially, the angle of retraction alone is decisive for improved, optimized runtime behavior. Surfaces which exhibit a permanently increased condensation efficiency, in particular due to two mechanisms, provide for as large an area as possible an exposed capacitor area.

A first mechanism intervenes shortly after the nucleation of the condensate. Regardless of the design of the surface properties, it is not possible for these small drops to drain from the condenser surface solely by gravity because of their relatively unfavorable mass / wetting area ratio. This becomes possible only when the smallest drops of water combine to form larger drops of water. Of particular importance here is the reduction of the wetted surface during the merger, so that the above-mentioned relationship shifts in favor of a possible water droplet flow. If the wetted area is not significantly reduced during the merger, it can not be drained. Decisive for this behavior is above all the retreat angle of the surface.

In the context of a second mechanism, a water droplet has set in motion, so there is a possibility that it runs relatively fast in almost perfect spherical shape, or moves at a slow speed under the tightening of a more or less long trace track. The latter case should be avoided as there is a risk of icing. Also here the retraction angle of the condenser surface controls this drainage behavior. If the value is set correspondingly high, then not only a relatively fast and, above all, as complete as possible drainage of the water droplet can be ensured, but also relatively small, not yet flowable water droplets lying in the discharge lane can be included.

Conventional evaporators are coated so that their surfaces give a retraction angle of about 30 °. Due to the properties according to the invention of the surfaces or of the further surface, the improved dripping behavior of the corresponding surface results.

According to a preferred embodiment of the household appliance according to the invention, the part of the surfaces and / or the further surface is provided with a coating. A suitable coating is e.g. a plasma coating, preferably a low-pressure plasma coating, a nano-coating, a powder coating and / or a coating. The coating can advantageously be produced by means of a wet-chemical process. The coating comprises, in particular, a silicon-organic hybrid material.

In particular, the property according to the invention of the surfaces or of the further surface can be achieved by means of plasma coatings or nanocoatings. It is also advantageous if the retraction angle properties according to the invention remain relatively long under permanent exposure to moisture. It is possible that e.g. due to the smallest hydrolysis effects in the coating, a significant decrease in the withdrawal angle and thus a loss of the condensation-enhancing properties arises. Therefore, low-pressure plasma-deposited layers are particularly suitable as a coating.

According to a preferred embodiment of the household appliance according to the invention, the coating has a thickness of not more than 10 .mu.m, in particular not more than 2 .mu.m, preferably of not more than 500 nm. Because of this relatively thin coating, the heat resistance additionally produced by the coating can be kept relatively low, as a result of which the above-described increase in efficiency of the household appliance according to the invention designed as a domestic refrigerating appliance is only relatively poorly, if not negligibly, worsened.

For the reaction are suitable prepared from silicon-organic precursors layers or compounds that have a very low proportion of polar bonds. Furthermore, the material per se should have a relatively high stability with respect to the formation of polar bonds. These can arise, for example, when non-polar groups or polar bonds are broken or destroyed by environmental factors (for example, by hydrolysis). A suitable material is e.g. Greblon Ceran, which is e.g. used as a coating of cookware. Greblon is a registered trademark.

The coating may also include a pattern and / or a label. The Household appliance according to the invention can also be designed as a domestic dishwasher, which includes a washing container with the surfaces which define the interior, wherein the interior space is provided for loading items to be washed. The items to be washed include, for example, dishes and / or cutlery. The washing container comprises in particular two side walls, a ceiling and a rear wall. Preferably, only the rear wall and the two side walls have said properties. Due to the selected retreat angle, the drying of the items to be washed can be improved during a drying step carried out by the household dishwasher.

The domestic dishwasher may comprise a water tank, which is arranged behind the surface of the washing container, which is at least partially formed so that water droplets forming there a retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably at least 80 °. This part of the washing container in particular has a surface actively cooled by the water in the water tank. The surface in question is in particular the surface of the rear wall of the washing container.

The domestic appliance according to the invention can also be designed as a condensation drying apparatus which has the heat exchanger with the surface. The heat exchanger is e.g. a crossflow heat exchanger. The household appliance according to the invention designed as a condensation drying apparatus preferably comprises a heat pump which has a refrigerant circuit with an evaporator designed as the heat exchanger.

Condensation drying devices are intended to dry wet or damp laundry. The laundry can be stored in a e.g. horizontally rotating drum and is thereby constantly circulated during operation. Heated air is passed into or through the laundry to dry it.

In condensation drying equipment, the air within the condensation drying apparatus is arranged in a largely closed circuit. The initially cool air is heated, which reduces their relative humidity. The heated air is passed through the laundry in the drum, e.g. blown and absorbs moisture caused by evaporation of the laundry. The e.g. Below the drum arranged heat exchanger extracts moisture from the air inside the condensation dryer by cooling the air at the heat exchanger surface. As a result, water droplets can form on the surface of the heat exchanger or of the evaporator. Due to the property according to the invention of at least part of the surface of the heat exchanger, these water droplets can flow off relatively quickly.

Embodiments of the invention are illustrated by way of example in the accompanying schematic drawings. Show it:

1 a domestic refrigerator with a coolable inner container in a perspective view,

2 a refrigerant circuit of the household refrigerating appliance,

3 a side view of a rear wall of the household refrigerator,

4 a designed as Rollbond evaporator evaporator household refrigerating appliance,

5 a domestic dishwasher in a perspective view,

6 a schematic representation of the household dishwasher, and

7 a schematic representation of a condensation dryer.

The 1 shows a household refrigerator 1 in perspective as an example of a household appliance comprising a plurality of walls bounding an interior, the walls comprising surfaces facing the interior.

In the case of the present embodiment, the household refrigerator includes 1 a thermally insulated body with an inner container 2 holding a coolable interior 3 limited. The inner container 2 includes in particular a rear wall 4 and two side walls 5 and a blanket 6 , The inner container 2 forms the coolable interior 3 facing surfaces 4a . 5a . 6a , In particular, the side walls 5 one surface each 5a , the back wall 4 a surface 4a and the ceiling 6 a surface 6a on. The coolable interior 3 is intended for storage of food, not shown.

The household refrigerator 1 has in the case of the present embodiment, a pivoting door leaf 7 to close the coolable interior 3 on. With the door open 7 is the coolable interior 3 accessible. On the towards coolable interior 3 directed side of the door leaf 7 are in the case of the present embodiment, several door racks 7a for storing Arranged food. In the coolable interior 3 are in particular several shelves 8th arranged for storing food and in the lower part of the coolable interior 3 is in particular a drawer 9 arranged, can be stored in the food.

The household refrigerator 1 includes one in the 2 shown refrigerant circuit 20 for cooling the coolable interior 3 , In the case of the present embodiment, the refrigerant circuit comprises 20 the coolable interior 3 a compressor 21 , one to the compressor 21 downstream condenser 22 , one to the liquefier 22 downstream throttle device 23 , which is designed in particular as a throttle or capillary tube, and an evaporator 24 that is between the throttle device 23 and the compressor 21 is arranged.

In the case of the present embodiment, the household refrigerator includes 1 a gutter 10 to condensate or forming water droplets 11 collect, collect and preferably from the coolable interior 3 to the outside in a non-illustrated evaporation tray of the household refrigerator 1 to lead. The gutter 10 is eg on the back wall 4 molded, so that the surface 4a the back wall 4 forming water drops 11 into the gutter 10 be able to walk. The 3 shows a sectional view of a side view of a portion of the rear wall 4 with the gutter 10 ,

In the case of the present embodiment is behind the surface 4a the back wall 4 the evaporator 24 arranged, in particular behind the surface 4a the back wall 4 in the back wall 4 foamed. The surface 4a the back wall 4 represents in particular an actively cooled surface.

In the case of the present embodiment, the condensation rate, ie the amount of condensate per time (or condensation area) on the surfaces 4a . 5a . 6a of the inner container 2 , especially the surface 4a the back wall 4 Even at relatively high surface temperatures to improve, in the case of the present embodiment, at least a part of the surface 4a the back wall 4 if not the complete surface 4a the back wall 4 executed in such a way that on this part of the surface 4a forming water drops 11 a retraction angle of at least 40 °, in particular of at least 60 °, in particular at least 70 ° and preferably at least 80 °. Also the surfaces 5a the side walls 5 can have these properties.

In the case of the present embodiment, the evaporator 24 also as a planar evaporator and in particular as a Rollbond evaporator 24a be educated. The trained as a planar evaporator evaporator 24 especially within the coolable interior 3 be arranged.

The Rollbond evaporator 24a is in the case of the present embodiment spaced from the rear wall 4 of the inner container 2 attached to this. The Rollbond evaporator 24 but can also be on one of the side walls 5 be attached spaced from this. He can also partially cover at least part of the ceiling 6 of the inner container 2 extend. A side view of the Rollbond evaporator 24a is in the 4 shown. The 4 also shows part of the back wall 4 of the inner container 2 in a cutaway view.

The Rollbond evaporator 24a is designed plate-like or surface-shaped and includes surfaces 25 which are substantially parallel to the rear wall 4 or to the corresponding side wall 5 run.

In the case of the present embodiment, below the rollbond evaporator 24a the gutter 10 provided to condensate the Rollbond evaporator 24a to collect, collect and preferably outward into the non-illustrated evaporation tray of the household refrigerator 1 to lead.

In the case of the present embodiment, the condensation rate on at least one of the surfaces 25 Rollbond evaporator 24a is at least a part of at least one of the surfaces in the case of the present embodiment 25 executed in such a way that on this part of the surface 25 forming water drops 11 a retraction angle of at least 40 °, in particular of at least 60 °, in particular at least 70 ° and preferably at least 80 °.

So that said part of the surface 4a the back wall 4 or the said part of the surface 25 Rollbond evaporator 24a has said property, in the case of the present embodiment, the surface 4a or at least the said part of the surface 4a the back wall 4 or the surface 25 or the said part of the surface 25 Rollbond evaporator 24a with a coating 12 . 12a Mistake.

The coating 12 . 12a For example, it is designed as a plasma coating, a nano-coating or as a powder coating. It can also be designed as a paint job. The coating 12 . 12a was prepared in particular by means of a low-pressure plasma method. So that coating 12 the said property with respect to the drops of water 11 It preferably comprises a silicon organic hybrid material. A suitable material is Greblon Ceran, for example, which is used as a coating of cookware. Greblon is a registered trademark.

The coating 12 is preferably relatively thin. It is in particular a maximum of 10 μm, in particular a maximum of 2 μm and preferably a maximum of 500 nm thick.

The coating 12 may also include a pattern and / or a label. The coating 12a can eg directly on the surface 25 Rollbond evaporator 24a be applied. The Rollbond evaporator 24a can also be painted, with the coating 12a applied on the paint.

The 5 and 6 show a household dishwasher 51 as another example of a household appliance comprising a plurality of walls defining an interior, the walls including surfaces facing the interior.

The 5 shows the household dishwasher 51 in a perspective and the 6 shows the household dishwasher 51 in a schematic representation.

The household dishwasher 51 has a rinse tank 52 on having an interior 53 limited to the inclusion of items to be washed. The household dishwasher 51 includes, for example, several, arranged one above the other, as baskets 54 trained dishes container in which the items to be washed can be arranged. The items to be washed are in particular cutlery and / or crockery, such as plates 55 ,

The washing container 52 includes in particular two side walls 56 , a back wall 57 A blanket 65 and a floor 58 which, the interior 53 facing surfaces 56a . 57a exhibit.

The washing container 52 can by means of a relative to a horizontal axis pivotable door leaf 59 be closed, as is usual. With the door open 59 can the baskets 54 from the washing container 52 be pulled to load and unload the baskets 54 at least easier. In the washing container 52 for example, spray devices for applying the washware are arranged with a liquid, which is commonly referred to as rinse liquor. The spray devices are, for example, as spray arms mounted rotatably 60 educated. For example, the liquid may be from below the soil 58 of the washing container 52 arranged circulation pump 61 via liquid feed lines to the spray arms 60 be encouraged. The circulation pump 61 For example, by means of an electric drive, not shown, in particular by means of its electric motor driven. The floor 58 includes a flow 63 so that the liquid inside the rinse tank 52 to the circulation pump 61 can get.

In the case of the present embodiment, the household dishwasher includes 51 a water tank 62 especially behind the back wall 57 of the washing container 52 is arranged and in particular with this area in contact. The water tank 62 is intended for holding water and / or liquid, which is used to rinse the dishes. The surface 57a the back wall 57 represents in particular an actively cooled surface.

In the operation of the household dishwasher 51 can adhere to the interior 53 facing surfaces 56a . 57a of the washing container 52 , especially the back wall 57 and the side walls 56 Condensate in the form of water droplets 66 form.

In the case of the present embodiment, the condensation rate, ie the amount of condensate per time (or condensation area) on the surfaces 56a . 57a the side walls 56 and the back wall 57 of the washing container 52 , especially the surface 57a the back wall 57 Even at relatively high surface temperatures to improve, in the case of the present embodiment, at least a part of the surface 57a the back wall 57 if not the complete surface 57a the back wall 57 (and / or the side walls 56 ) carried out such that on this part of the surface 57a forming water drops 66 have at least 40 °, in particular at least 60 °, in particular at least 70 ° and preferably at least 90 °.

So that said part of the surface 57a the back wall 57 has said property, in the case of the present embodiment, the surface 57a or at least the said part of the surface 57a the back wall 57 with a coating 64 Mistake.

The coating 64 For example, it is designed as a plasma coating, a nano-coating or as a powder coating. It can also be designed as a paint job. It was produced in particular by means of a wet-chemical process. So that the coating 64 the said property with respect to the drops of water 63 It preferably comprises a silicon organic hybrid material. A suitable material is eg Greblon Ceran, which is used eg as coating of cookware. Greblon is a registered trademark.

The coating 64 is preferably relatively thin. In particular, it is at most 10 μm, in particular not more than 2 μm and preferably not more than 500 nm thick.

The coating 64 may also include a pattern and / or a label.

The 7 shows a condensation dryer 71 as an example of a household appliance with a heat exchanger.

The condensation dryer 71 has a housing 72 on, within which provided for receiving laundry laundry drum 73 is rotatably mounted with respect to a horizontal axis. During operation of the condensation dryer 71 can the laundry drum 53 be rotated by means of a non-illustrated drive with respect to the horizontal axis.

The condensation dryer 71 includes a relative to the housing 72 swiveling door leaf 74 , which opens an opening in the housing 72 accessible, so the laundry drum 73 can be loaded or unloaded with the laundry.

Inside the case 72 is a channel system 75 provided, which partially below the laundry drum 73 runs. Within the channel system 75 is a circulation pump 76 arranged, which is arranged such that it air within the channel system 75 so promotes that in the direction of arrows 77 blows. In particular, the air is through the laundry drum 73 promoted, especially from the back of the condensation dryer 71 in the direction of the door leaf 74 comprehensive front of the condensation dryer 71 ,

Especially in the area of the door leaf 74 can be within the channel system 75 a replaceable lint filter 78 be provided.

During operation of the condensation dryer 71 the air is before entering the laundry drum 73 For example, heated by means of an electric heater, not shown, so that this heated air the laundry in the laundry drum 73 to dry. The moisture-enriched air flows out of the laundry drum 73 out and will by means of one within the channel system 75 and especially below the laundry drum 73 arranged heat exchanger cooled, whereby the air is deprived of moisture. This moisture settles on a surface of the heat exchanger as drops of water, which by means of a arranged below the heat exchanger water collecting tray 79 be caught. The heat exchanger is eg a cross-flow heat exchanger.

In the case of the present embodiment, the condensation drying apparatus 71 a heat pump 80 in the form of a refrigerant circuit. The heat pump 80 or the refrigerant circuit comprises a compressor 81 , one to the compressor 81 downstream condenser 82 , one to the liquefier 82 downstream throttle device and an evaporator 84 that between the throttle device and the compressor 81 is arranged.

The evaporator 84 and the liquefier 82 are within the channel system 75 and especially below the laundry drum 73 arranged. The condenser 82 is in the direction of the arrows 77 , ie in the direction of the air flow of the air to the evaporator 84 after switching on and warming the air before entering the laundry drum 73 , The condenser 82 So acts in the case of the present embodiment as a heater for heating the air.

The evaporator 84 is provided, the heated and moisture-enriched air coming out of the laundry drum 77 is encouraged to cool to deprive her of moisture. The evaporator 84 has a surface 85 on which this moisture precipitates as drops of water, by means of the below as the evaporator 84 running heat exchanger arranged water catch tray 79 be caught

So that the water drops improves from the surface 85 the heat exchanger or the evaporator 84 drip off, ie the rate of condensation, ie the amount of condensate per time (or condensation surface) at the surface 85 the heat exchanger or the evaporator 84 is at least a part of the surface in the case of the present embodiment 85 the heat exchanger or the evaporator 84 if not the complete surface 85 the heat exchanger or the evaporator 84 executed in such a way that on this part of the surface 85 forming water droplets have a retraction angle of at least 40 °, in particular at least 60 °, in particular at least 70 ° and preferably at least 90 °.

So that said part of the surface 85 the heat exchanger or the evaporator 84 has said property, in the case of the present embodiment, the surface 85 or at least the said part of the surface 85 the heat exchanger or the evaporator 84 with a coating 86 Mistake.

The coating 86 For example, it is designed as a plasma coating, a nano-coating or as a powder coating. It can also be designed as a paint job. It was produced in particular by means of a wet-chemical process. So that the coating 86 has said property with respect to the water droplets, it preferably comprises a silicon organic hybrid material. A suitable material is Greblon Ceran, for example, which is used as a coating of cookware. Greblon is a registered trademark.

The coating 86 is preferably relatively thin. In particular, it is at most 10 μm, in particular not more than 2 μm and preferably not more than 500 nm thick.

LIST OF REFERENCE NUMBERS

1

 Household refrigerator

2

 inner container

3

 coolable interior

4

 rear wall

4a

 surface

5

 side walls

5a

 surface

6

 blanket

6a

 surface

7

 Türbaltt

7a

 door racks

8th

 shelves

9

 drawer

10

 gutter

11

 Waterdrop

12

 coating

12a

 coating

20

 Refrigerant circulation

21

 compressor

22

 condenser

23

 throttling device

24

 Evaporator

24a

 Rollbond evaporator

25

 surfaces

51

 Domestic dishwasher

52

 rinse tank

53

 inner space

54

 baskets

55

 Plate

56

 side walls

56a

 surface

57

 rear wall

57a

 surface

58

 ground

59

 door leaf

60

 spray arms

61

 circulating pump

62

 water tank

63

 procedure

64

 coating

65

 blanket

66

 Waterdrop

71

 Condensation drying device

72

 casing

73

 washing drum

74

 door leaf

75

 channel system

76

 circulating pump

77

 arrows

78

 lint

79

 Drip tray

80

 heat pump

81

 compressor

82

 condenser

84

 Evaporator

85

 surface

86

 coating

Claims (13)

Household appliance, - comprising several, one interior ( 3 . 33 ) bounding walls ( 2 . 4 . 5 . 6 . 52 . 56 . 57 . 58 . 65 ), the interior ( 3 . 33 ) facing surfaces ( 4a . 5a . 56a . 57a ), of which at least part of the surfaces ( 4a . 5a . 56a . 57a ) is formed such that on this part of the surface forming water droplets ( 11 . 66 ) have a retraction angle of at least 40 °, and / or in which inside the interior ( 3 ) a component ( 24a ) as part of the household appliance ( 1 ), which has a further surface ( 25 ), wherein at least a part of the further surface ( 25 ) is formed such that on this part of the further surface ( 25 ) forming water droplets ( 11 ) have a retraction angle of at least 40 °, or - comprising a heat exchanger, in particular an evaporator ( 24 . 84 ) a refrigerant circuit ( 20 . 80 ), which has a surface ( 25 . 85 ), wherein at least a part of the surface ( 25 . 85 ) of the heat exchanger is designed such that on this part of the surface ( 25 . 85 ) of the heat exchanger forming water droplets ( 11 ) have a retraction angle of at least 40 °. Domestic appliance according to claim 1, characterized in that the part of the surfaces ( 4a . 5a . 56a . 57a ) and / or the further surface ( 25 ) and / or the surface ( 25 . 85 ) of the heat exchanger is designed such that on this part of the surfaces ( 4a . 5a . 56a . 57a ) or the further surface ( 25 ) or the surface ( 25 . 85 ) of the heat exchanger forming water droplets ( 12 . 66 ) have a retraction angle of at least 60 °, in particular of at least 70 °, preferably of at least 80 °. Domestic appliance according to claim 1 or 2, characterized in that the walls of the Interior ( 3 . 53 ) two side walls ( 5 . 56 ), a back wall ( 4 . 57 ) and a blanket ( 6 . 65 ), wherein at least a part of the surfaces ( 4a . 5a . 56a . 57a ) at least one of the side walls ( 5 . 56 ) and / or the back wall ( 4 . 57 ) is formed such that there forming water droplets ( 11 . 66 ) have a retraction angle of at least 40 °, in particular of at least 60 °, of at least 70 °, preferably of at least 80 °. Domestic appliance according to one of claims 1 to 3, characterized in that the part of the surface ( 4a . 5a . 56a . 57a ) and / or the further surface ( 25 ) and / or the surface ( 25 . 85 ) of the heat exchanger with a coating ( 12 . 12a . 64 . 86 ), in particular provided with a plasma coating, a nano-coating, a powder coating and / or a coating, which was produced in particular by means of a wet-chemical process and / or in particular comprises a silicon organic hybrid material. Domestic appliance according to claim 4, characterized in that the coating ( 12 . 12a . 64 . 86 ) has a thickness of not more than 10 μm, in particular not more than 2 μm, preferably of not more than 500 nm. Domestic appliance according to claim 4 or 5, characterized in that the coating ( 12 . 12a . 65 ) comprises a pattern and / or a label. Domestic appliance according to one of claims 1 to 6, characterized in that this as a household refrigeration appliance ( 1 ) is formed, the a refrigerant circuit ( 20 ) with an evaporator ( 24 . 24a ) for cooling the interior ( 3 ) and a heat-insulated body with a the surfaces ( 4a . 5a ) having inner container ( 22 ), wherein the interior is provided for storing food, and / or wherein the heat exchanger as the evaporator ( 24 . 24a ) is trained. Domestic appliance according to claim 7, characterized in that the evaporator ( 24 ) behind the surface ( 4a ) of the inner container ( 2 ) is arranged, which is at least partially designed such that there forming water droplets ( 11 ) have a retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably of at least 80 °. Domestic appliance according to claim 7 or 8, characterized in that the inner container ( 2 ) at least one vertically extending wall ( 4 ) and the evaporator as a planar evaporator ( 24a ) which is spaced from the vertical wall (FIG. 4 ) within the coolable interior ( 3 ) and which has a surface ( 25 ), which is at least partially formed such that there forming water droplets ( 11 ) have a retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably of at least 80 °. Domestic appliance according to one of Claims 1 to 6, characterized in that it can be used as a domestic dishwasher ( 51 ) is formed, which a rinsing container ( 52 ) with the surfaces ( 56a . 57a ), which limits the interior space, wherein the interior ( 53 ) for loading items ( 55 ) is provided. Domestic appliance according to claim 10, characterized in that it has a water tank ( 62 ), which behind the surface ( 57a ) of the washing container ( 52 ) is arranged, which is at least partially designed such that there forming water droplets ( 66 ) have a retraction angle of retraction angle of at least 40 °, in particular of at least 60 °, in particular of at least 70 °, preferably of at least 80 °. Domestic appliance according to one of claims 1 to 6, characterized in that this as a condensation drying apparatus ( 71 ) is formed, which the heat exchanger with the surface ( 86 ) having. Domestic appliance according to claim 12, characterized by a heat pump ( 80 ), which a refrigerant circuit with a heat exchanger formed as the evaporator ( 85 ) having.

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