EP1138229B1 - Barrier cover for a refrigerated display cabinet - Google Patents

Abstract

The two sides of the cover (5) have different sized surfaces or the cover is formed in at least two layers so that one of the layers forms a larger surface than the other. The smaller surface layer is made from acrylic material and the larger surface layer is made from woven material such as woven glass fibres.

Description

The invention relates to a cover for an at least partially cooled goods display furniture, in particular for a forward and / or upwardly open cooling cabinet, preferably for a refrigerated shelf or a freezer, in which the outer dimensions of the customer space and the goods space facing sides are identical.

Furthermore, the invention relates to an at least partially cooled goods display furniture with at least one cover.

In a variety of at least partially cooled goods presentation furniture, such. As refrigerated shelves, the opening is closed by means of a cover for the purpose of energy saving during shop closing times. Such covers are usually designed as roller blinds, which are stored in the ceiling area of the goods display cabinet during the store opening times in the rolled up state and for the purpose of closing the furniture opening in front of the Kühlmöbelöffnung or the goods space opening of the role or rolled out.

In particular, goods display furniture, which are designed for the so-called. Freezer - such as freezers, shelves, etc. - but also need during the store opening times a cover so that the temperatures required in the goods room can be realized. Such covers are usually designed as lifting or folding and / or sliding doors. These covers are often at least partially made transparent to allow the customer to inspect the presented in the furniture goods or easier.

FIG. 1 shows, in a side sectional view, a (low) cooling rack 1 which rests on a preferably isolated furniture body 2. Within the refrigerated goods room 3 several goods display shelves 4 are provided as a rule. The roll-off of a roller 6 cover 5 closes the refrigerated goods compartment 3 with respect to the warmer ambient air. Penetration of the ambient air into the refrigerated goods space 3 can be prevented. The in the Cooling shelf 1 prevailing cooling air flow is shown schematically with reference to the arrows 7; It flows out of the cooling air outlet opening arranged in the upper, front region of the furniture 1 along the cover 5 and is subsequently returned to the furniture carcass 2 via the return air grille 8. The along the furniture opening from top to bottom flowing cooling air curtain can be formed in one or more layers. For the sake of clarity, FIG. 1 does not show the aggregates and components required for refrigeration since they are not the subject of the present invention.

From German Utility Model 298 04 329 a perforated cover is known in which the perforation of the cover in different areas of the cover is designed differently strong. The perforation of the cover has hitherto been fundamentally necessary, since without perforation, condensation occurs within the goods space, preferably on the undersides of the goods presentation floors. Furthermore, it also comes on the outside - so the customer facing side - the cover to a condensation. This condensation affects on the one hand the presentation of the goods offered in the refrigerator and on the other hand often leads to damage to the goods offered. The German Utility Model 295 12 039 discloses a cover for a freezer, in which the bottom, so the cooled goods space facing side of the cover has a concave mirror shape or is provided with a retroreflective prismatic structure.

A disadvantage of the use of a perforated cover, however, that emerges from the lower region of the refrigerated goods space cooling air and in the upper part of the refrigerated goods compartment to the same extent warmer ambient air penetrates into the goods display furniture; This has the consequence that the heat flow in the furniture - compared with a furniture that has a non-perforated cover - is increased.

Object of the present invention is to provide a cover for an at least partially cooled goods display furniture, in which this increase in the heat flow is avoided. At the same time, however, the formation of condensation in the refrigerated goods space of the goods display cabinet equipped with such a cover and on the outside of the cover should be effectively prevented. Furthermore, an at least partially cooled goods display furniture is to be specified with at least one cover, in which the said disadvantages of the prior art can also be avoided.

A cover according to the invention is defined in claim 1 and is characterized in particular in that the two sides of the cover have different sized surfaces or the cover is at least two layers and one of the layers has a larger surface area than the other layer (s) ) and wherein the cover is arranged in its covering position relative to the goods display furniture such that that position or that side of the cover, which has a larger surface, the customer space to or away from the goods space.

The inventive, at least partially cooled goods display furniture with at least one cover is characterized in that it has a cover according to the invention.

The cover according to the invention is therefore constructed asymmetrically with respect to the surface sizes of the at least two layers or their two sides. This has the consequence that due to the asymmetry of the heat exchanger surfaces - so the different sized surfaces - ventilation of the cover from the outside is no longer required. Nevertheless, the cover according to the invention remains free of condensate. Since the cover according to the invention is designed to be air-tight, there is no leakage of cooling air from the cooled goods space and also no inflow of warmer ambient air into the cooled goods space; The heat flow into the refrigerated goods display furniture is thereby significantly reduced, whereby a significant energy saving is achieved.

mit

λ_i:

Wärmeübergangskoeffizient Abdeckungsinnenseite - Luft

λ_a:

Wärmeübergangskoeffizient Abdeckungsaußenseite - Luft

T_r :

Raum- bzw. Umgebungstemperatur

T_m :

Lufttemperatur im Warenraum

T_a :

Oberflächentemperatur der Abdeckungsaußenseite

T_i :

Oberflächentemperatur der Abdeckungsinnenseite

A_i :

Abdeckungsinnenlageoberfläche / Seite mit kleinerer Oberfläche

A_a :

Abdeckungsaußenlageoberfläche / Seite mit größerer Oberfläche

The heat flow Q passing through the cover can be described as follows: $$\mathrm{Q}\mathrm{=}{\mathrm{\lambda }}_{\mathrm{i}}\mathrm{*}{\mathrm{A}}_{\mathrm{i}}\mathrm{*}\left({\mathrm{T}}_{\mathrm{i}}\mathrm{-}{\mathrm{T}}_{\mathrm{m}}\right)\mathrm{=}{\mathrm{\lambda }}_{\mathrm{a}}\mathrm{*}{\mathrm{A}}_{\mathrm{a}}\mathrm{*}\left({\mathrm{T}}_{\mathrm{r}}\mathrm{-}{\mathrm{T}}_{\mathrm{a}}\right)$$

With

λ _i :

Heat transfer coefficient inside cover - air

λ _a :

Heat transfer coefficient outside cover - air

T _r :

Room or ambient temperature

T _m:

Air temperature in the goods room

T _a :

Surface temperature of the cover outside

T _i :

Surface temperature of the cover inside

A _i :

Cover inner layer surface / side with smaller surface

A _a:

Cover outer layer surface / side with larger surface

Provided that A _i >> A _a true, then the temperature difference (T _r - T _a) is significantly smaller than that of a smooth surface of the cover, as is the case for the previous covers with A _i = A _a. However, since the room or ambient temperature T _r remains unchanged, I is compared to a cover in which the cover inner surfaces of the side and are -außenseite identical, a higher surface temperature of the cover outside of T _a. As a result, the cover according to the invention remains free of condensate even with a higher relative moisture content, which is why it is possible to dispense with aeration of the cover, as has hitherto been achieved through the perforation of the cover.

Further developing the cover according to the invention, it is proposed that the layer with the smaller surface consists of an acrylic material and the layer with the larger surface consists of a woven material.

The weaving of the material inevitably leads to an enlargement of the surface and thus to the desired effect. As a woven material, in particular a glass fiber fabric can be used.

Advantageously, in the cover according to the invention, the layer or side with the smaller surface in a white color and the position or side with the larger surface in a dark, preferably a black color.

By means of this embodiment, the desired effect is increased because a further increase in the surface temperature of the cover outside T _{a is} achieved by this color.

Preferably, the individual layers of the cover according to the invention are at least partially connected to each other.

In order to prevent the lower region of the cover according to the invention from being forced outwards into the customer space by the flow of cooling air - and thus undesired "falling out" of the cooling air from the furniture goods space - the cover is weighted down in its lower region.

Further developing the cover according to the invention, it is proposed that the cover is perforated at least partially, preferably perforated in its upper and / or lower region. This embodiment of the cover according to the invention makes sense especially in extreme climatic conditions - high temperature and humidity.

Further developing the goods display furniture according to the invention, it is proposed that means for fixing the cover located in the covering position and / or the cover moved into the covering position are provided. This ensures that the cover can be fixed in the optimum position or directed into this and the mentioned, unwanted "falling out" of the cooling air from the furniture goods room can be effectively prevented.

FIG. 2 shows the area of the cover 5 according to the invention, which is circled in FIG. 1. This consists of a layer with a smaller surface 9, which in turn consists of an acrylic material, for example, and a layer with a larger surface 10, preferably a woven surface Material - for example, a glass fiber fabric - exists.

In principle, the cover according to the invention can be used wherever a cold air area is to be separated from a hot air area and, secondly, an air exchange between these two areas is undesirable. The cover according to the invention is therefore suitable for all types of goods display furniture - ie shelves, chests, counters, etc. -

Claims (10)

1. Cover for an at least partially refrigerated display furniture for goods, in particular for a forwardly and/or upwardly open refrigeration furniture, preferably a refrigeration cabinet or refrigeration chest wherein the outer dimensions of the sides facing the customer space and facing the goods storage space are identical, both sides of the cover (5) have differently sized surface areas, or the cover (5) is formed with at least two layers and one of the layers (10) comprises a bigger surface area than the other layer(s) (9) and wherein the cover (5) in its covering position is provided such that in relation to the display furniture for goods the layer or side (10) of the cover (5) with the bigger surface area faces the customer space.
2. Cover according to claim 1, characterized in that the smaller surface area layer (9) consists of an acrylic material and the bigger surface area layer (10) consists of a tissue material.
3. Cover according to claim 2, characterized in that the tissue material is a fibre glass tissue.
4. Cover according to any of the preceding claims, characterized in that the smaller surface area layer or side (9) is of a white tone and the bigger surface area layer or side (10) is of a dark tone, preferably of a black tone.
5. Cover according to any of the preceding claims, characterized in that the layers (9, 10) are at least partially connected to one another.
6. Cover according to any of the preceding claims, characterized in that the cover (5) is weighed down in its lower portion.
7. Cover according to any of the preceding claims, characterized in that the cover (5) is at least partially perforated, preferably in its upper and/or lower portion.
8. At least partially refrigerated display furniture for goods with at least one cover, characterized in that the cover(s) (5) is (are) formed according to any of the preceding claims.
9. At least partially refrigerated display furniture for goods according to claim 8, characterized in that the cover (5) can be rolled onto a roller (6) provided on the display furniture for goods (1).
10. At least partially refrigerated display furniture for goods according to claim 8, characterized in that means are provided for securing the cover (5) which is in the covering position or which is moving into the covering position.

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