DE102013007922A1 - Recirculating air cooling counter and method for operating a circulating air cooling counter - Google Patents

Abstract

In the case of a circulating air cooling counter and in a method for operating a circulating air cooling counter, an air flow is guided along the underside of a goods floor through deflectors or through a suitable duct in order to increase the efficiency.

Description

The invention relates to a convection refrigerated counter and a method for operating a convection refrigerated counter.

Umluftkühltheken and methods for the operation of circulating air cooling counters are, for example, from DE 10 2010 022 860 A1 , from the DE 10 2011 06 208 A1 or from the DE 10 2011 103 577 A1 known. Similarly, there are convection refrigerated counters in the DE 202 11 407 U1 as well as in the DE 201 00 881 U1 , All these recirculating air cooling counters have in common that in these a cold point of a cooling unit and a fan is arranged below a floor, on which ultimately goods are presented to a customer. The respective cooling unit and the fan generate a circulating air flow, which cools over the bottom of the product. Due to the arrangement of the cooling point below the product floor, the air flow itself can not be effective directly below the product floor, wherein in the arrangements according to the DE 201 00 881 U1 or after the DE 10 2011 103 577 A1 the cooling unit rests against the bottom of the goods, so that a cooling can be ensured even at varying angles of attack of the product bottom from the bottom by the material contact between the bottom of the goods on the one hand and the housing of the cooling unit. Other convection refrigerated counters, for example from the CH 602 977 C , from the EP 0 830 827 B1 or from the DE 34 05 839 A1 or from the still unpublished DE 10 2012 018 153 A1 have cold spots of the cooling units not below the bottom of the product but in areas of the recirculation channel, which are not below the floor, such as vertical areas front or rear - so for example on the part of the customer or operator staff - on.

It is an object of the present invention to provide a convection refrigerated counter or a method for operating a convection refrigerated counter with a higher efficiency.

As a solution Umluftkühltheken or methods for operating a convection refrigerated counter with the features of the independent claims are proposed. Further advantageous embodiments can be found in the subclaims and the following description.

Thus, the efficiency of a recirculating air cooling counter can increase, in which air flow circulates through a goods compartment and through a recirculating air duct and sweeps over a goods floor arranged in the goods floor, wherein in the recirculation duct, a fan and a cold point of a cooling unit are arranged when the convection refrigerated counter is characterized in that the circulating air duct has a deflector which deflects the air flow upwards in the circulation direction in front of or at an underside of the goods floor. By such a deflector in particular cold air of the air flow can be conducted upwards under the bottom of the goods, which would have flowed without such a deflector due to their higher specific gravity in the lower region of the circulating air channel. In this way, this cooler air can effectively cool the bottom of the goods from below and thus increase the efficiency.

It is understood that this configuration is particularly advantageous if the cold point of the cooling unit is not located directly below the bottom of the goods, with embodiments are conceivable in which corresponding efficiency increases can be achieved by such a deflector in the latter case.

If the deflector forms a wall of the circulating air channel, so much cold air can be deflected accordingly. On the other hand, such a deflector structurally relatively simple. Alternatively, the deflector but also by corresponding baffles, which are set in or on the recirculating air channel, be realized.

The efficiency can also be increased by a recirculating air cooling counter, in which an air flow circulates through a goods compartment and through a circulating air duct and sweeps over a goods floor arranged in the goods compartment, wherein a fan and a cold point of a cooling unit are arranged in the recirculation duct, if the recirculation duct a channel cross-section which narrows in the direction of circulation in front of or at an underside of the goods floor in the direction of the underside of the product floor. By this narrowing in the direction of the underside of the product floor is colder air, which otherwise naturally circulates in the lower region of the recirculating air duct, far away from the bottom of the goods, brought to the bottom of the goods, so that accordingly the efficiency can be increased.

Preferably, the constriction is carried out in an area located below the product floor of the circulating air channel, which is structurally easy to implement, in particular in the rule.

The corresponding constriction can be realized in particular by a deflector, which should preferably be designed accordingly deflecting effective upwards.

According to the foregoing, the efficiency can also be increased by a method for operating a convection refrigerated counter, in which an air flow through a goods room and through a recirculating air duct and at one in the Circulating air duct arranged fan and circulates past a arranged in the circulating air duct cold point of a cooling unit and sweeps over a goods floor arranged in the goods floor, if this is characterized in that the air flow is directed below the goods floor against an underside of the goods floor.

Depending on the specific design of the convection refrigerated counter, the deflector may be biased by a spring against a stop. In this way, the deflector changed conditions, such as a changed employment of individual modules, easily take into account. Likewise, the deflector for cleaning purposes can be easily moved to other positions. By biasing can be realized with a suitable design that passes with the positioning of the goods floor, for example, after cleaning operations, the deflector in its intended position.

For example, the stop may be provided on the bottom of the goods, so that the deflector is biased by the spring against the bottom of the product or against a firmly connected to the bottom of the product assembly of the product floor. In this way, the deflector any movements of the product floor, for example, due to different angles of attack or by lifting for cleaning easily follow.

Alternatively or cumulatively to the above-described spring, the deflector may comprise a flexible, preferably elastic, surface element, which accordingly may be designed to be resiliently or prestressed, for example biased against a stop. Naturally, such a flexible or possibly elastic surface element is able to follow any movements without further ado, so that it is ensured that the deflector is still properly positioned or adjusted even in the event of any positional changes.

The deflector may comprise a curved surface element, whereby - if the bending radius is adjusted accordingly - a gentle concern with a stop or on a system with the associated soft transitions, which then correspondingly gently influence the deflected by the deflector air flow, can be guaranteed. This is the case, in particular, when the deflector comprises a surface element which is bent outward in relation to the circulating air channel. The bending radius can in particular be adapted to the geometrical conditions of the circulating-air cooling counter, in particular to the different angles of attack of the goods floor or to different heights of the product floor, in order to reduce any protrusions, etc., as well as disturbances of the air flow caused by them to a minimum.

The efficiency can also be increased when a method for operating a recirculating air cooling counter in which an air flow through a goods room and by a recirculating air duct and a fan arranged in the recirculation duct and at a arranged in the recirculation duct cold point of a cooling unit and via a in the Warehouse arranged goods floor sweeps, characterized in that the air flow is guided below the bottom of the goods along the bottom of the goods floor. Such a guidance of the air flow along the underside of the goods floor ensures that even colder air portions of the air flow can be guided along the underside of the goods floor and thus can be effective cooling. In particular, in contrast to the DE 10 2011 103 577 A1 or to the DE 201 00 881 U1 in which the air flow through the housing wall of the cooling unit is separated from the underside of the goods floor and cooling takes place only by heat conduction, this configuration leads to the air flow itself directly cooling the underside of the goods floor. The latter could possibly be achieved in the arrangements according to the prior art by configuring the cooling units without a housing wall in the direction of the underside of the product floor, so that the air stream which passes through the cooling unit is also guided past the underside of the product floor.

If the bottom of the goods can be adjusted in different angles of attack, it is advantageous if the guidance of the air flow takes place in each of the angles of incidence or in each operating position of the product bottom along the underside of the product base, so that a corresponding increase in efficiency is independent of the angle of attack.

Accordingly, an increase in efficiency in a convection refrigerated counter, in which a stream of air circulates through a goods compartment and a recirculating air duct and sweeps over a goods floor arranged in the goods floor, wherein in the air duct, a fan and a cold point of a cooling unit are arranged, can be realized in constructive terms if the circulating air duct has a wall fastened to the bottom of the goods below the bottom of the product and has the circulating air channel bounded on its side facing away from the bottom of the product. The wall ensures that even cold air portions of the air flow are passed close to the bottom of the product floor, even if the bottom of the goods moves or is used at different angles of attack.

Good flow conditions and a simple construction can be realized if the wall extends perpendicular to the circulation and / or in a plane lying in the plane of circulation and parallel to the goods floor direction parallel to the goods floor. This requires, at least in a region of the circulating air channel below the product floor, that the circulating air channel has a substantially constant cross section in the direction of circulation, so that an orderly flow which positively influences the efficiency can be ensured. It is understood that in this regard small deviations, such as baffles or corrugations, through which the air flow can be additionally vortexed in order to achieve a better coupling to the bottom of the product, are not critical in this regard.

In this respect, the efficiency can also be increased by a recirculating air cooling counter, in which an air flow circulates through a goods room and through a goods room and sweeps over a goods floor arranged in the goods floor, wherein in the recirculation duct, a fan and a cold point of a cooling unit are arranged, increase, if characterized in that the product bottom forms a wall of the circulating air channel in an area below the product bottom and the circulating air channel has a constant in the circulation direction at each angle of attack or at each operating position of the product floor cross section in this area. It is understood in this context that these advantages already occur when this area does not extend over the entire bottom of the product floor but only over a part.

In particular, a recirculating air duct with a constant cross section can be realized in an area below the goods floor if the recirculating air duct is bounded in this area on one side by the goods floor and on the other side by a wall directed parallel to the goods floor.

As a part of the many different walls of the circulating air channel, the above-mentioned wall preferably delimits a passive subregion of the circulating air channel, that is to say a subregion of the circulating air channel in which no energy input or energy discharge takes place into or out of the air stream. Accordingly, the wall preferably limits a subregion of the circulating air channel, in which there is no fan, which naturally introduces energy, or no cold spot, which extracts natural energy from the air flow. In this respect, fan and cold point are provided at a different position in the recirculating air duct, so that the wall, which realizes the constant cross-section or a leading the air flow below the goods floor along the bottom of the product floor, their effect undisturbed and in particular in addition to the cooling effects of Develop cold spot or regardless of the Verwirbelungseffekten the fan and thus can contribute very effectively to an increase in efficiency.

The above-explained wall can be structurally simple, especially by a fixed to the bottom of the product molded part with a U-shaped cross-section perpendicular to the direction of circulation. It is understood that the U-shape may also be realized by a plurality of parts, which are connected to each other accordingly. Preferably, the molding is designed as Luftleitschachtblech so that it can be made very easily. It is understood that the Luftleitschachtblech does not necessarily have to be formed metallic, but an embodiment of plastic is advantageous if a good insulation down is desired. The term "sheet metal" thus serves as a definition as a thin-walled sheet-like design.

For cleaning purposes, it is advantageous if the molding is at least partially removable. Thus, for example, the entire molded part can be made removable in its U-shape. It is also possible that only the bottom of the U-shaped molded part is designed to be removable.

If the circulating air cooling counter has a deflector which is pretensioned by a spring against a stop, it is advantageous if the above-explained goods base or the above-described molded part forms this stop. This ensures a particularly simple structure and easy to be held tightly over the bias in different operating positions connection between the deflector and the wall or the molding.

The increase in efficiency prove to be particularly efficient when the cold junction of the cooling unit and / or the fan are spaced from the bottom of the product, since then direct cooling effects caused by radiation or heat transfer to the cold spot or by air turbulence by the fan, not in These areas are cooling effect and thus the embodiments described above with regard to the guidance or steering of the air flow or in terms of concrete structural measures on the underside of the goods floor by the deflector, by the narrowing of the channel cross-section, by the wall attached to the bottom of the product or by the area with the constant cross section of the circulating air channel can be particularly effective.

It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to implement the advantages in a cumulative manner.

Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are shown in particular in the appended drawing. In the drawing show:

1 a first convection refrigerated counter in a schematic section;

2 a second convection refrigerated counter in a schematic section;

3 an enlarged detail of a third convection refrigerated counter in a schematic section;

4 the bottom of the goods, arranged below the product bottom molding and a deflector of the arrangement according to 3 in exploded view;

5 the arrangement after 3 and 4 at differently adjusted goods floor;

6 an enlarged detail of a fourth circulating air cooling counter in a schematic section; and

7 a Umluftkühltheke according to the prior art in a schematic section.

The circulating air cooling counters shown in the figures 10 each have a foot 11 , a front wall 12 and a back wall 13 on, with the front wall 12 to a customer page 14 and the back wall 13 is directed to a personnel side. For hygienic reasons, the convection refrigerated counters have 10 in addition, only one person page 15 open hood 16 on, but in 3 . 5 and 6 not and in 1 and 2 only partially shown.

Each of the circulating air cooling counters 10 has a goods room 30 in which a goods floor 31 is arranged and which of the hood 16 is protected so that goods can be presented to a customer in this way.

About the goods or about the goods floor 31 sweeps a stream of air 20 which is in a circulation direction 21 in a circulation 22 (Counterclockwise in the drawing plane in these embodiments). This airflow 20 is inside the convection refrigerated counter 10 through a recirculating air channel 40 in which a fan 51 as well as a cold spot 52 a cooling unit are arranged. While in these embodiments, the fan 51 and the cold spot 52 in a vertical area of the recirculation channel 40 on the back wall 13 are provided, it is understood that the fan 51 or the cold spot 52 also elsewhere in the recirculation channel 40 can be provided.

Likewise, it is understood that - depending on the concrete execution - the circulation 22 vice versa, ie clockwise, can circulate.

In these embodiments, further assemblies, such as a compressor of the refrigeration unit, are in the foot 11 intended. In other embodiments, however, on the foot 11 be waived. Likewise, the shape of the hood 16 vary or on a hood 16 be waived. It is also conceivable that a filing 17 in these embodiments, on the back wall 13 intended for the staff is designed differently or that on such a filing 17 is waived.

In deviation from the in 7 The prior art shown in FIG 1 to 6 illustrated embodiments close to the bottom 32 of the commodity floor 31 an air duct shaft 66 on, which is formed in these embodiments as a substantially U-shaped molding and a wall 44 of the circulating air channel 40 forms, which the recirculation channel 40 at his from the goods floor 31 limited path-wise side and is designed such that the recirculation duct 40 in this area one in the direction of circulation 21 at every angle 33 or at each operating position of the goods floor 31 constant channel cross section 46 having. In this respect, the recirculation channel 40 in the area of constant cross section on one side, namely above, through the bottom of the goods 31 and on the other side, down below, through the wall 44 limited.

This is how the wall stretches 44 perpendicular to the circulation 22 which, as can be seen, lies in the plane of the drawing. In addition, the wall extends 44 parallel to the goods floor in a plane lying in the plane of circulation so in the plane of the drawing and parallel to the bottom of the goods, so parallel to the air flow 20 , or to the direction of circulation 21 exactly in the area of the wall 44 defined channel cross-section 46 ,

As can be seen immediately, in 1 to 6 illustrated embodiments of the air flow 20 below the product floor 31 along the bottom 32 of the commodity floor 31 guided, the leadership of the air flow 20 in each of the angles of attack or in each operating position of the goods floor 31 along the bottom 32 of the commodity floor 31 he follows.

In addition, the in 1 . 3 to 5 and 6 Illustrated embodiments deflector 42 on which the airflow 20 upwards towards the goods floor 31 redirect.

As can be seen immediately, this requires that the recirculation duct 40 a channel cross-section 46 having, in the circulation direction before or at the bottom 32 of the commodity floor 31 towards the bottom 32 of the commodity floor 31 narrows. Here is in the in 1 and 3 to 5 illustrated embodiments of the deflector 42 on the bottom 32 of the commodity floor 31 provided, which accordingly a narrowing at the bottom 32 of the commodity floor 31 conditionally, while in the 6 illustrated embodiments of the deflector in front of the bottom 32 of the commodity floor 31 is arranged so that a corresponding deflection also corresponding to the bottom 32 of the commodity floor 31 he follows.

While at the in 6 illustrated embodiment of the recirculation channel 40 in the area of the deflector 42 is designed open, forms the deflector 42 the in 1 and 3 to 5 illustrated embodiments, a wall 44 of the circulating air channel 40 , whereby a particularly close guidance of the air stream 20 is guaranteed.

On the other hand, in the embodiment according to 6 provided gap that the bottom of the goods 31 relatively free at different angles of attack 33 can be employed without the at this point by the deflector 42 and the direction of flow due to excessive leaks of cold air would be expected. Similarly, in the case of 3 to 5 To realize illustrated embodiment, is a surface element 63 of the diverter 42 by a spring 61 against a stop 62 biased, which through the underside of the Luftleitschachtblechs 66 of the commodity floor 31 is provided. This surface element 63 is in this embodiment with respect to the recirculation channel 40 bent outwards so that it is at different operating positions of the goods floor 31 to the stop 62 snugly. This Anschmiegung is still supported by the fact that the surface element 63 elastic and a bit flexible, which - depending on the specific implementation - the corresponding also only by the spring 61 or exclusively by a correspondingly flexible or elastic surface element 63 can be realized. Likewise, it is conceivable other measures, which is a displacement of the deflector 42 in relation to a stop or a wall 44 of the circulating air channel 40 allow to provide.

In concrete implementation, the bending of the surface element 63 , ie the length of the sheet in relation to the display of the surface element 63 as well as the bending or the bending radius, to the geometric conditions of the circulating air cooling counter 10 be adjusted. Preferably, the design is such that at the highest possible position of the product floor 31 the leading edge of the deflector 42 near the beginning of the wall 44 is arranged (see deleted position in 5 ), while in a lower position the deflector 42 is pressed down and due to its curvature of the deflector 42 also again near this leading edge on the wall 44 is applied. In this way, turbulence can be reduced to a minimum.

As in 4 exemplified, the wall can 44 through a molding 65 be formed, which has a substantially U-shaped cross-section. Such a molded part 65 can already be trained in itself relatively stiff and relatively easy, as exemplified in 4 through attachment points 67 indicated, to the bottom of the goods 31 be attached. This can, for example, by a press fit with at the attachment points 67 provided bulges or made by a clip or locking connection. Also can in the goods floor 31 and the molding 65 be provided corresponding bulges or knobs or recesses. It is also conceivable on the molding 65 Provide strips, which behind corresponding projections of the goods floor 31 intervene or vice versa.

Preferably, the molding is 65 made of a material with low thermal conductivity. In this regard, for example, offer plastics on. In this way, a loss of cold down can be further reduced. In the area of the wall 44 ie in the area in which airflow 20 along the bottom 32 of the commodity floor 31 is guided, can - regardless of all other measures, which are described herein - measures to swirl the passing cold air of the air flow 20 be provided. This can, for example, baffles or transverse grooves of the bottom 32 of the commodity floor 31 or the wall 44 be. Such transverse grooves also have the advantage of the respective walls 44 to stiffen, so that thinner walls are possible, which can accordingly cost-saving effect.

At the in 1 illustrated embodiment is the deflector 42 similar to the embodiment according to 6 rigidly formed. Optionally, it is removably attached for cleaning purposes. As can be seen immediately, the distracts diverter 42 the circulating airflow 20 after it flows down the front wall, back up. This function also fulfills the deflector 42 of the embodiment according to 6 , wherein by a supplementary plate 43 Too much sinking of the airflow 20 on the front wall 12 is already prevented, so that the deflector in this embodiment is not as strong as in the in 1 illustrated embodiment, must deflecting intervention.

The embodiment according to 2 dispenses with deflectors 42 Of course, these may possibly also be provided in a different embodiment. Instead, a sealing plate 45 provided, which ensures that only air from immediately below the goods floor 31 from the fan 51 is sucked. This also ensures that a large part of the cold air that circulates, even on the bottom of the goods 31 passed and to an accumulation of warm air below the goods floor 31 is prevented.

It is understood that in the 1 to 6 shown measures can be combined in different ways with each other. Likewise it goes without saying that corresponding measures also apply to recirculating air cooling counters 10 According to the state of the art ( 7 ) can be retrofitted partially or in large numbers without further notice.

Depending on the concrete implementation, the surface element 63 of in 3 to 5 illustrated embodiment of a holder, for example via a holder for the spring 61 , removable to the body of the circulating air cooling counter 10 be attached. The removability facilitates in particular a cleaning.

Preferably, care is taken to ensure that the measures taken do not obstruct a drain of condensation, which can be ensured for example by small openings or the like. Likewise, it is not mandatory that the deflector 42 reaches down to the bottom of the counter, so that condensation can run off here.

It is understood that in an alternative embodiment, the surface element 63 also on the wall 44 can be arranged. Depending on the concrete implementation, a corresponding flexibility can also be provided here.

LIST OF REFERENCE NUMBERS

10

Convection cooling counter

11

foot

12

front wall

13

rear wall

14

customer page

15

personal page

16

Hood

17

filing

20

airflow

21

circulation direction

22

circulation

30

goods space

31

were ground

32

Bottom of the goods floor 31

33

angle of attack

40

return air duct

42

diverter

43

supplementary plate

44

Wall of the circulating air channel 40

45

sealing plate

46

Channel cross section

51

fan

52

cold junction

61

feather

62

attack

63

surface element

64

Umlenkerblech

65

molding

66

Luftleitschachtblech

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010022860 A1 [0002]
• DE 10201106208 A1 [0002]
• DE 102011103577 A1 [0002, 0002, 0016]
• DE 20211407 U1 [0002]
• DE 20100881 U1 [0002, 0002, 0016]
• CH 602977 C [0002]
• EP 0830827 B1 [0002]
• DE 3405839 A1 [0002]
• DE 102012018153 A1 [0002]

Claims (19)

Refrigerated air conditioning counter ( 10 ), in which a stream of air ( 20 ) through a goods room ( 30 ) and by a recirculating air channel ( 40 ) and via one in the goods room ( 30 ) arranged goods floor ( 31 ), wherein in the recirculating air channel ( 40 ) a fan ( 51 ) and a cold junction ( 52 ) of a cooling unit, characterized in that the recirculating air duct ( 40 ) in the direction of circulation ( 21 ) in front of or at a bottom ( 32 ) of the commodity floor ( 31 ) one the air flow ( 20 ) upwardly deflecting deflector ( 42 ) having. Refrigerated air conditioning counter ( 10 ) according to claim 1, characterized in that the deflector ( 42 ) a wall ( 44 ) of the recirculation channel ( 40 ). Refrigerated air conditioning counter ( 10 ), in which a stream of air ( 20 ) through a goods room ( 30 ) and by a recirculating air channel ( 40 ) and via one in the goods room ( 30 ) arranged goods floor ( 31 ), wherein in the recirculating air channel ( 40 ) a fan ( 51 ) and a cold junction ( 52 ) is arranged a cooling unit, characterized in that the recirculating air channel ( 40 ) has a channel cross-section ( 46 ), which in the direction of circulation ( 21 ) in front of or at a bottom ( 32 ) of the commodity floor ( 31 ) towards the bottom ( 32 ) of the commodity floor ( 31 ) narrowed. Refrigerated air conditioning counter ( 10 ) according to claim 3, characterized in that the constriction in a below the product floor ( 31 ) located area of the circulating air channel ( 40 ) he follows. Refrigerated air conditioning counter ( 10 ) according to claim 3 or 4, characterized in that the constriction by a deflector ( 42 ) is realized. Refrigerated air conditioning counter ( 10 ) according to claim 1, 2 or 5, characterized in that the deflector ( 42 ) by a spring ( 61 ) against one, preferably at the bottom of the goods ( 31 ), stop ( 62 ) is biased. Refrigerated air conditioning counter ( 10 ) according to one of claims 1, 2, 5 and 6, characterized in that the deflector ( 42 ) a flexible, preferably elastic, surface element ( 63 ). Refrigerated air conditioning counter ( 10 ) according to one of claims 1, 2 and 5 to 7, characterized in that the deflector ( 42 ), preferably in relation to the recirculating air channel ( 40 ) to the outside, curved surface element ( 63 ). Refrigerated air conditioning counter ( 10 ), in which a stream of air ( 20 ) through a goods room ( 30 ) and by a recirculating air channel ( 40 ) and via one in the goods room ( 30 ) arranged goods floor ( 31 ), wherein in the recirculating air channel ( 40 ) a fan ( 51 ) and a cold junction ( 52 ) of a cooling unit, characterized in that the recirculating air duct ( 40 ) one below the product floor ( 31 ) on the bottom of the goods ( 31 ), the recirculating air duct ( 40 ) at its bottom ( 31 ) groundbreaking side bounding wall ( 44 ) having. Refrigerated air conditioning counter ( 10 ) according to claim 9, characterized in that the wall ( 44 ) perpendicular to the circulation ( 22 ) and / or in one at the level of circulation ( 22 ) and to the bottom of the goods ( 31 ) parallel direction parallel to the goods floor ( 31 ). Refrigerated air conditioning counter ( 10 ), in which a stream of air ( 20 ) through a goods room ( 30 ) and by a recirculating air channel ( 40 ) and via one in the goods room ( 30 ) arranged goods floor ( 31 ), wherein in the recirculating air channel ( 40 ) a fan ( 51 ) and a cold junction ( 52 ) of a cooling unit, characterized in that the goods floor ( 31 ) a wall ( 44 ) of the recirculation channel ( 40 ) in an area below the commodity floor ( 31 ) and the recirculation channel ( 40 ) in this area one in the direction of circulation ( 21 ) at each angle of attack or at each operating position of the commodity floor ( 31 ) has a constant cross-section. Refrigerated air conditioning counter ( 10 ) according to claim 11, characterized in that the recirculating air duct ( 40 ) in the region of constant cross-section on one side through the bottom of the goods ( 31 ) and on the other side by a parallel to the goods floor ( 31 ) directed wall ( 44 ) is limited. Refrigerated air conditioning counter ( 10 ) according to claim 9, 10 or 12, characterized in that the wall ( 44 ) a passive portion of the recirculation channel ( 40 ), in particular a subregion of the recirculating air channel ( 40 ) without the fan ( 51 ) and / or without the cold junction ( 52 ), limited. Refrigerated air conditioning counter ( 10 ) according to one of claims 9, 10, 12 and 13, characterized in that the wall ( 44 ) by a on the goods floor ( 31 ), preferably at least partially removable, fixed molded part ( 65 ), in particular air guide shaft plate ( 66 ), with a U-shaped cross-section perpendicular to the direction of circulation ( 21 ) is formed. Refrigerated air conditioning counter ( 10 ) according to claims 6 and 14, characterized in that the molded part ( 65 ) the attack ( 62 ). Method for operating a circulating air cooling counter ( 10 ), in which a stream of air ( 20 ) through a Goods room ( 30 ) and by a recirculating air channel ( 40 ) and at one in the recirculating air channel ( 40 ) arranged fan ( 51 ) and at one in the recirculating air channel ( 40 ) arranged cold junction ( 52 ) circulates past a cooling unit and via a in the goods space ( 30 ) arranged goods floor ( 31 ), characterized in that the air flow ( 20 ) below the commodity floor ( 31 ) against a bottom ( 32 ) of the commodity floor ( 31 ) is directed. Method for operating a circulating air cooling counter ( 10 ), in which a stream of air ( 20 ) through a goods room ( 30 ) and by a recirculating air channel ( 40 ) and at one in the recirculating air channel ( 40 ) arranged fan ( 51 ) and at one in the recirculating air channel ( 40 ) arranged cold junction ( 52 ) circulates past a cooling unit and via a in the goods space ( 30 ) arranged goods floor ( 31 ), characterized in that the air flow ( 20 ) below the commodity floor ( 31 ) along the bottom ( 32 ) of the commodity floor ( 31 ) to be led. Operating method according to claim 17, characterized in that the goods floor ( 31 ) in different angles of attack ( 33 ) is adjustable and the leadership of the air flow ( 20 ) in each of the angles of attack ( 33 ) or at each operating position of the goods floor ( 31 ) along the bottom ( 32 ) of the commodity floor ( 31 ) he follows. Ventilated air cooling counter or operating method according to one of the preceding claims, characterized in that the cold junction ( 52 ) of the cooling unit and / or the fan ( 51 ) from the bottom of the goods ( 31 ) spaced, preferably in a region of the recirculation channel ( 40 ), which is not below the commodity floor ( 31 ) is located, are arranged.

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