DE202008011707U1 - Refrigerated furniture and measuring arrangement for such furniture - Google Patents

Abstract

refrigeration cabinets (1) having a storage space cooled by air (3a, 3b, 3c) (2) for refrigerated goods (4) and with a measuring system, the one measuring device with at least one temperature sensor (5), characterized in that the temperature sensor (5) is coupled to a mass storage (6) such that the temperature sensor (5) detects the temperature of the mass memory (6), wherein the mass storage (6) within the storage space (2) for the refrigerated goods (4) is arranged and consists of a material, the cooling behavior of the of the chilled goods (4) is adjusted.

Description

The The present invention relates to a refrigerated cabinet with an air cooled storage room for Refrigerated goods and with a measuring system, which is a measuring device comprising at least one temperature sensor. Furthermore the invention relates to a measuring arrangement for such Furniture.

In the manufacture, treatment, transport and storage as well as the bringing into circulation of food, the temperature control and the observance of certain temperatures play a decisive role in order to limit an undesired multiplication of microorganisms. So places among other things the DIN 10508 such temperatures and gives hints for temperature measurement. Recommended storage temperatures include -18 ° C for frozen foods and ice cream, + 6 ° C to + 8 ° C for dairy products, chicken eggs, pasteurized egg products and delicatessen salads, + 4 ° C to + 8 ° C for meat and meat products, + 8 ° C for fresh fruit and fresh vegetables and + 2 ° C to + 4 ° C for other perishable foods.

A refrigerator of the type mentioned is for example from the DE 195 46 493 A1 known. The refrigerated cabinet described in this document is a refrigerated display case equipped with a climate control device for controlling temperature, humidity and the like and having a central controller which controls the temperature, the air flow and the humidity programmed. The one measuring unit, which receives all necessary sensors and is constructed in a compact design, is arranged together with an evaporator unit and a fan pivotally below the storage space for the refrigerated goods.

to Temperature measurement, for example in a refrigerated counter, freezer or in a storage room, become known often used so-called air sensors, the exposed or - hanging be placed and well reached by the incoming air are. For example, due to the continuous sale of the Chilled goods from a refrigerated shelf in a supermarket and the limited durability will not be the feelers positioned directly in the chilled goods. Hygienic aspects speak also against the positioning of the sensor in the refrigerated goods.

For now are refrigerated shelves for use in the supermarket, in particular for the storage of meat, such as minced meat, of dairy products and fruit, equipped with three feelers. First There is a temperature sensor that measures the temperature of the Supply air to the storage or goods room measures. There is also a temperature sensor, which measures the temperature of a return air, which is a mixed air from shop air and air from the refrigerated cabinet represents. And finally, there is a feeler in the case a mounted electric defrost heater the temperature of a Evaporator body measures.

The Refrigerated cabinets are measured with the aid of the measured values of the supply air and the return air sensor regulated. The two temperatures be in a certain proportion depending on the purpose, location, Daytime, shop opening, etc. compared. An average, the z. B. in the ratio of 30% supply air to 70% return air is calculated, then specifies whether the refrigerator cool or turn off. This mean should be the Match product temperature and will also be used for quality control storage, d. H. for logging a nominal goods temperature.

The different valence for determining the nominal product temperature The sensor measured values are referred to as weighting. However, this is usually true about the weighting of the supply air and return air temperature, calculated nominal temperature value not consistent with the actual product temperature. This is due to temperature changes after defrosting, in the shop, Interruption of the air curtain etc. The change in air temperature occurs much faster one as the change of the goods temperature. Thus, a "incorrect" temperature value for both the regulation of the refrigerated cabinets as well as for quality control. at any change in the return air temperature, the by lamp radiation, door opening, train etc. enter can, a different product temperature is displayed. While and shortly after the defrost, the air temperature sensors falsify the value of the product temperature calculated as representative especially strong. This "error" is especially at defrost with running fans, z. B. in a meat rack, very large.

Many supermarket operators therefore have major problems with the veterinarians who carry out a quality control of the refrigerated goods, as these criticize the differences between the actual product temperature and the nominal temperature given as representative. This can then lead to the imposition of fines and follow-up appointments. It is true that damage to goods resulting from incorrectly adjusted refrigerated cabinets, as well as penalties by the operators, could be avoided. if one would measure the actual goods temperature, which however for hygienic reasons, due to the goods handling (durability etc.) and for reasons of the expenditure of the measurement is not possible.

Of the present invention is based on the object, a refrigerated cabinet of the type described above and a suitable one To provide measuring arrangement, which in a little complex manner The temperature measurement can be improved without being hygienic Regulations are violated.

According to the invention this achieved for the refrigerated cabinets by that the temperature sensor with a mass storage such coupled is that the temperature sensor the temperature the mass memory is detected, the mass storage within arranged the storage space for the refrigerated goods is and consists of a material whose cooling behavior adapted to the chilled goods.

For the measuring arrangement according to this invention achieved that this has a temperature sensor, the is coupled to a mass storage such that the temperature sensor the temperature of the mass memory is detected, the mass memory consists of a material whose cooling behavior is the cooling behavior is adapted to a refrigerated goods whose temperature determined shall be.

hereby is according to the invention with advantage a direct Temperature measurement in refrigerated goods simulated. This is the - without an erroneous averaging - measured temperature value almost identical to the value of the actual goods temperature, during the cooling and defrosting operation, at day and night. Therefore, in the inventive Measuring arrangement provided composite of mass storage and temperature sensor in analogy to the aforementioned "air sensor" also be referred to as "goods temperature sensor".

at The mass storage may be in a preferred embodiment the invention to a wrapped by a plastic film Gelkissen act. The temperature sensor is doing in a Gel cushion bedded or glued between two gel cushions, so that the mass storage completely envelops the sensor. Due to the heat exchange with the air determining Properties, in particular the cooling behavior of the gel corresponds the temperature which the sensor measures, the temperature of the chilled goods in its core.

As known, can in the refrigerator according to the invention the presence of a temperature sensor on an evaporator body and a temperature sensor for the supply air in provided the storage space for the refrigerated goods be. Depending on the supply air temperature can be, in particular taking into account the measured values of the evaporator probe, Conclusions on the condition, in particular on icing of the evaporator, or any other interference pull.

The Goods or cooling product temperature can but only using the measured values from the simulated goods temperature sensor be managed. The goods temperature sensor, that is the measuring arrangement according to the invention, is once at startup of the invention Cooling cabinet calibrated and does not have to change the shop temperature, the lighting conditions, increased or reduced customer frequency at the refrigerator or when changing the air speed or otherwise Heat sources are reset. The one determined by him Temperature value always corresponds to the product temperature. He can with Advantage on the one hand for regulatory purposes and on the other hand for temperature control and -logging purposes.

Further advantageous design features of the invention are in the subclaims and the following description.

Based of illustrated in the drawings, preferred embodiments will be explained in more detail below the invention become. Showing:

1 schematically, in cross section, a cooling rack as an exemplary representation of a refrigerated cabinet according to the invention,

2 in a reduced scale opposite 1 , the cooling rack, integrated in a cooling circuit,

3a and 3b in two main views, an illustration of a first embodiment of a measuring arrangement according to the invention,

4a and 4b in two main views, a representation of a second embodiment of a measuring arrangement according to the invention,

5 a measured value diagram with a comparison of a temporal temperature variation of the air and a temporal temperature variation of a first material to be cooled in a refrigerated cabinet,

6 a measured value diagram with a comparison of a determined with a measuring arrangement according to the invention temporal temperature variation in a refrigeration unit according to the invention and a temporal temperature response of a second refrigerated goods in this refrigerator.

In the figures of the drawing are the same or corresponding to each other Parts always provided with the same reference numerals, so that they are in usually only be described once each.

As it turned out first 1 and 2 shows, has a cooling cabinet according to the invention - in the illustrated case a cooling rack - a storage space cooled by air 2 for refrigerated goods 4 and a measuring system unspecified as a whole, comprising a measuring device with at least one temperature sensor 5 includes. The air is in 1 and 2 through the arrows 3a . 3b . 3c designated, wherein the reference numeral 3a the supply air to the storage room 2 , the reference number 3b the room air to the storage room 2 and the reference numeral 3c the return air from the storage room 2 describe. At the temperature sensor 5 it may preferably be a resistance thermometer or a thermocouple.

According to the invention it is provided that the temperature sensor with a mass storage 6 coupled so that the temperature sensor 5 the temperature of the mass storage 6 captured, with the mass storage 6 inside the storage room 2 for the refrigerated goods 4 is arranged and consists of a material whose cooling behavior of the refrigerated goods 4 is adjusted. In particular, in terms of a maximum heat transfer from the mass storage 6 to the temperature sensor 5 provide that mass storage 6 the temperature sensor 5 completely wrapped.

A measuring arrangement according to the invention 7 , as exemplified in two embodiments 3a . 3b . 4a and 4b each shown in an individual representation, thus comprises at least one temperature sensor 5 which with a mass storage 6 coupled so that the temperature sensor 5 the temperature of the mass storage 6 detected, wherein the mass storage is made of a material, the cooling behavior of the cooling behavior of a chilled goods 4 is adapted whose temperature is to be determined.

In the preferred embodiment of the measuring arrangement 7 according to 3a and 3b It is provided that the mass storage 6 at least one of a plastic film 8th coated with a gel 9 or a fluid filled pad. Specifically, it is provided in this embodiment that the temperature sensor between two gel pads 6a . 6b is glued.

In the embodiment of the measuring arrangement according to the invention 7 according to 4a and 4b is provided that the mass storage 6 at least one, in particular metallic, with a gel 9 or a liquid-filled sleeve 10 , in particular a tubular sleeve comprises. The temperature sensor 5 is in 4a and 4b not to see for yourself, but one in the tube sleeve 10 led connection cable 11 for the temperature sensor 5 , which transmits the thermal voltages occurring during the temperature measurement to the measuring device.

The gel 9 may preferably be a hydrogel. The liquid may preferably consist predominantly of water or of a hydrocarbon or hydrocarbon mixture, such as oil or paraffin.

To avoid a change in the state of aggregation of the gel 9 or the liquid, which may also be associated in general with unfavorable with regard to the functional performance sudden changes in property, the gel 9 or the liquid has a below 0 ° C, in particular in the range of -15 ° C to -20 ° C, lying, solidification range or melting point. For this purpose, the gel 9 or the liquid contains a freezing point water lowering additive, such as a salt or a polyhydric alcohol, especially common salt, isopropanol or ethylene glycol.

The gel 9 For example, silica gel, a polysaccharide, in particular starch, a cellulose derivative, xanthan, guar or locust bean gum, agar agar, gum arabic, alginate, bentonite, chitin, hyaloronic acid or a polyacrylate may be present as gelling agent. When using a polyacrylate (PNC) as a gelling agent, however, salts should not be used for antifreeze, as they may have decomposition effects.

As 1 and 2 also can show the gel pads 6a . 6b with the feeler 5 at one for a medium temperature in the refrigerator 1 representative body, e.g. B. on a mid-height merchandise display 12 im-seen from the front - especially the second quarter of the display 12 of the shelf are positioned. The feeler 5 with the mass storage 6 can be in one in the delivery 12 integrated or disposed therein, made of plastic or metal tub 13 , in particular at a height of about 3 to 4 cm above the ground, be deposited, with the connecting cable 11 for the feeler 5 about the delivery 12 led into the back of the furniture and the respective bottom of the tub 13 and / or the display 12 can be punched.

In the embodiment of the measuring arrangement according to the invention 7 according to 4a and 4b are fixing clamps 14 provided by means of which the measuring arrangement 7 also at another suitable location in the refrigerator according to the invention 1 can be positioned and held.

In the refrigerator according to the invention 1 can advantageously be dispensed with a return air sensor, so that the equipment cost is reduced. Instead of providing a return air sensor, that is with the mass storage 6 coupled temperature sensor 5 in the storage or goods room 2 arranged, he, like 2 illustrates to an existing controller 15 - z. B. in a worm system - can be connected. Thus, the temperature value determined according to the invention can advantageously be used on the one hand for control purposes and on the other hand for temperature control purposes.

In the case of a defrost, for example, the actual temperature, which changes slowly in terms of its dynamic behavior, also goes into the refrigerated goods 4 , and not the temperature change of the air, which changes rapidly with regard to its dynamic behavior 3a . 3b . 3c in the quality control of the chilled goods 4 one.

How out 2 it can be seen in the refrigerator according to the invention 1 the presence of another temperature sensor 16 on an evaporator body 17 a cooling circuit 18 be provided in the the cooling cabinet 1 is involved.

As shown - can also have another, third, temperature sensor 19 for the supply air 3a in the storage room 2 for the refrigerated goods 4 be provided.

The feeler 16 at the evaporator body 17 which is mounted when an electric defrost is provided, has the function to terminate the defrost. In particular, the defrost can on the one hand by this sensor 16 at the evaporator body 17 and on the other hand be terminated by a time set at a timer, not shown.

The supply air temperature sensor 19 indicates with which temperatures the supply air 3a in the refrigerator according to the invention 1 is blown. Depending on this supply air temperature can be, in particular taking into account the measured values of the evaporator probe 16 , Conclusions about the condition, in particular icing, of the evaporator 17 or on any other interference.

The goods or refrigerated product temperature can, however, exclusively by means of the measured values from the measuring arrangement according to the invention 7 be regulated by according to a signal from the controller 15 a control valve 20 for supplying or stopping the supply of a cooling medium in the cooling circuit 18 is opened or closed.

To simulate as accurately as possible the dynamic thermal behavior of the chilled goods 4 by the measuring arrangement according to the invention 7 To achieve that, the composite temperature sensor should be used 5 and mass storage 6 a response time, characterized by a thermal coupling time constant T _K , between the occurrence of a temperature change of the air 3b and their display in the measuring device, which is several times greater than a by a thermal sensor time constant T _F marked response time of the temperature sensor 5 solely between the occurrence of a change in temperature of the air 3b and their display in the measuring device. The thermal sensor time constants T _F of thermocouples and resistance thermometers are known to be in the range of about 5 s to 200 s, depending on the design. By a large thermal coupling time constant T _{K of} the measuring arrangement according to the invention 7 is achieved that these stochastic occurring, short-term changes in the air temperature filters and these do not affect the measurements, the temperature of the refrigerated goods 4 represent.

For this purpose, it is particularly of particular advantage if the thermal coupling time constant T _{K of} the composite of temperature sensor 5 and mass storage 6 at least approximately equal to one thermal heat transfer time constant T _W , which is the dynamic behavior of the heat transfer from the air 3b to the refrigerated goods 4 features.

One after a certain time t under the influence of the cooling air 3b in the storage room 2 in the refrigerated goods 4 adjusting temperature T ₄ can be approximated by the formula T 4 = T 4A - (T. 4A - T 3 ) Exp (-t / T W ) (1) where T _{4A is} the initial temperature in the chilled goods 4 and T _{3 is} the temperature of the cooling air 3b is.

Accordingly applies to the temperature T ₇ in the measuring arrangement according to the invention 7 : T 7 = T 7A - (T. 70 - T 3 ) Exp (-t / T K ) (2), where T _{7A is} the initial temperature in the measuring arrangement 7 is.

The thermal coupling time constant T _{K of} the composite of temperature sensor 5 and mass storage 6 or the thermal heat transfer time constant T _W can according to the formula T i = C / (A j · α j ) (3) where the index i is either K or W and the index j is either 4 or 7 and where A and α _{j are} respectively the heat transfer area A (in m ² ) and the heat transfer coefficient α (in W / m ² · K) of the product 4 or the measuring arrangement according to the invention 7 describe.

C stands for an average heat capacity (in kJ / K), which results from the formula 1 / C = 1 / C 3 + 1 / C j (4) can be calculated. Herein, with C _3, the heat capacity of the air 3b and C _j with j = 4 or 7 the heat capacity of the material 4 or the measuring arrangement according to the invention 7 designated.

So that the thermal coupling time constant T _{K of} the composite of temperature sensor 5 and mass storage 6 and the thermal heat transfer time constant T _{W are} equal, so should the quotient of the heat capacity C ₇ and the product of heat transfer coefficient α ₇ and area A _{7 of} the composite of temperature sensor 5 and mass storage 6 be about as large as a quotient of the heat capacity C ₄ and the product of heat transfer coefficient α ₄ and area A _{4 of} the chilled goods.

The heat capacity C _j is general C j = m j · c j = rho j · V j (5) where m _{j is} the mass (in kg), c _{j is} the specific heat capacity (in kJ / K · kg), rho _{j is} the density (in kg / m ³ and V _{j is} the volume (in m ³ ) - either of the chilled goods 4 or the measuring arrangement according to the invention 7 - stand.

In the simplest case, an optimal simulation of the temperature of the chilled goods 4 by the measuring arrangement according to the invention 7 be achieved when the composite of temperature sensor 5 and mass storage 6 about the same specific heat capacity c, the same heat transfer coefficient α to air, the same mass m and the same surface A as the refrigerated goods 4 , The heat transfer coefficient α is determined in particular by the convection of the air, whose influence on measuring arrangement 7 and good 4 is to be regarded as similar, and determines the Wärmeleitfähikeit λ (in W / m · K). Consequently, the thermal conductivity λ of the composite of temperature sensor 5 and mass storage 6 be about the same size as the chilled goods 4 ,

For various refrigerated goods 4 Table 1 below shows values for the specific heat capacity c ₄ and the thermal conductivity λ ₄ , which determine the properties of the mass storage 5 can be used. Table 1: Properties of refrigerated goods refrigerated 4 c [kcal / kg · K] λ [W / m · K] fruit and vegetables - fresh 0.80-0.95 0.49 - frozen 0.50 to 0.65 1.12 milk 0.93 Quark 0.70 cheese 0.45-0.65 butter 0.55 to 0.60 0.22 eggs 0.76 0.43 fish - raw 0.60-0.85 0.50-0.55 - dried 0.55 - frozen 0.30 to 0.55 0.95 to 1.17 beef - lean, fresh 0.77 0.47 - lean, frozen 0.41 1.40 - fat, fresh 0.60 - fat, frozen 0.30 pork meat - lean, fresh 0.60 0.50 - lean, frozen 0.37 1.55 - fat, fresh 0.51 0.37 - fat, frozen 0.32 0.72

As already mentioned, shows 5 a measured value diagram with a comparison of a temporal temperature response of the air L (T) and a temporal temperature G (T) of a first refrigerated goods 4 - About a day away - in a refrigerator. The time t is plotted in hours on the abscissa axis and the temperature T in ° C. on the ordinate axis.

As refrigerated goods 4 500 g of minced meat (half / half), in plastic bowl, were welded in, with an opening for the probe. A "Testo 177-4" gauge incorporating a Testo built-in probe with stainless steel ferrule, measuring from -50 ° C to + 205 ° C and class accuracy was used 2 would have.

It it can be seen that the temperature curves L (T) and G (T) temporally and in particular strongly in the measured value height from each other differ. The air temperature L (T) is higher, with the Deviations from the temperature of the product G (T) fluctuate greatly. In addition, the changes in air temperature occur L (T) significantly faster than changes in the temperature of minced meat.

6 shows - as mentioned - a measured value diagram with a comparison of one with a measuring arrangement according to the invention 7 certain temporal temperature transition E (T) in a refrigerator according to the invention 1 - in concrete terms as in the measurements 5 in a refrigerator - and a temporal temperature transition J (T) of a second refrigerated goods 4 in this refrigerator 1 ,

As refrigerated goods 4 150 grams of yoghurt, 1.5% fat, were placed in the cup, with an opening for probes. For measuring the temporal temperature transition J (T) in the refrigerated goods 4 In turn, a "Testo 177-4" gauge was used with a Testo built-in probe with stainless steel ferrule, measuring range -50 ° C to + 205 ° C and class accuracy 2 would have. Using this probe as a temperature sensor 5 was by insertion into a gel pad a measuring arrangement according to the invention 7 made as they are in 3a and 3b is shown, and thus the temperature response E (T) in the storage room 2 of the Kühlmö bels 1 added.

It can be seen that the temperature curves E (T) and J (T) hardly deviate from each other. The temperature curves are almost the same, with the temperature of the gel pads 6a . 6b about 0.1 to 0.3 ° C higher than that of yogurt. However, these deviations can be eliminated by calibration.

The goods temperature sensor, so the inventive measuring arrangement 7 , is once upon startup of the refrigerator according to the invention 1 calibrated and does not have to change the charging temperature, the lighting ratio, increased or decreased customer frequency on the refrigerator 1 or reset when air speed or other heat sources change. The of the measuring device according to the invention 7 The determined temperature value always corresponds to the product temperature. It can be advantageously used on the one hand for regulatory purposes and on the other hand for temperature control and logging purposes.

The invention is not limited to the exemplary embodiments described, but also encompasses all embodiments which have the same effect in the sense of the invention, as already apparent from the above description. So can as gels 9 a variety of substances are used, for example, such as those in the DE 44 25 306 C1 or DE 199 42 566 A1 are described. Also, the mass storage 6 be made in different size and shape and thus adapted, for example, to measurements above or below 0 ° C, taking into account the values listed in Table 1.

Similar results as for curve E (T) in 6 - but with greater deviations - were also achieved with a "Frigo Doc" worm probe TRK 277, which has a measuring range of -45 ° C to + 65 ° C and an accuracy of less than +/- 0.5 K at -20 ° C , less than +/- 0.2 K at 0 ° C and less than +/- 0.5 K at 15 ° C. This temperature sensor 5 was on the one hand in a measuring arrangement 7 with a mass storage 5 according to 3a and 3b and on the other hand with a mass storage 5 according to 4a and 4b used, in the latter case filled with oil tube sleeve 10 made of copper was used. Considering that for minced meat half / half according to Table 1 with a specific heat capacity c of about 0.55 kcal / kg · K and a thermal conductivity λ of about 0.48 W / m · K is to be expected, while corresponding oil, in particular for the thermal conductivity deviating values of 0.45 kcal / kg · K and of 0.22 W / m · K, could by changing the specific heat capacity c, the heat transfer coefficient α to air, the mass m, the surface A and / or the thermal conductivity λ here is still an optimization.

Here it is of great importance when considering the properties of the chilled goods 4 also pay particular attention to its packaging, which decisively influences the dynamics of the heat transfer. The same applies to the design of the surface of the mass storage 6 to. On the packaging of the refrigerated goods 4 and on the surface of the mass storage 6 In each case, the highly rate-determining step of the convective heat transfer takes place from the air 3b in the storage room 2 to the refrigerated goods 4 or to the mass storage. Therefore, especially for the surface of the mass storage device 6 a material to be selected in its cooling behavior, in particular the thermal conductivity, the packaging of the goods to be chilled 4 is adjusted. For example, a metallic sleeve 10 , as described in the embodiment according to 4a and 4b is provided, for example, by painting, coated with a polymer layer. Thus, the influence of the high thermal conductivity of the metal - copper: 350 to 370 W / m · K - on the heat transfer coefficient α and thus turned off or reduced to a reduction in the thermal sensor time constant T _F.

What the measuring system and the measuring device located therein of the measuring arrangement according to the invention 7 relates, which are not shown figuratively, so they can be performed in a conventional manner and, for example, a suitable display device or a computer containing, with the connecting cable 11 to the temperature sensor 5 is connected. The same applies to the design of the 2 shown regulator 15 to.

Further the invention is not to those in the claims 1 and 18 defined feature combinations limited, but can also be determined by any other combination of Be defined characteristics of all the individual features disclosed. This basically means virtually every single feature the independent claims omitted or by at least one individual feature disclosed elsewhere in the application can be replaced. In this respect, the claim is only as one to understand first formulation attempt for an invention.

1

refrigeration cabinets

2

Storage room for 4 in 1

3a

Supply air too 2

3b

Air in 2

3c

Return air out 2

4

Refrigerated goods in 2

5

temperature sensor

6

mass storage

6a, 6b

Pillow ( 3a . 3b )

7

Measuring arrangement off 5 and 6

8th

Plastic film of 6a . 6b

9

Gel in 6a . 6b

10

Sleeve of 6 ( 4a . 4b )

11

Connection cable too 5

12

Display of 1

13

Tub for 7

14

Mounting clamps for 10

15

regulator

16

Temperature sensor for 3a

17

Evaporator (body) in 18

18

Cooling circuit for 1

19

Temperature sensor on 18

20

Control valve in 18

E (T)

Temperature response of 7

G (T)

Temperature response of 4 , Minced meat

J (T)

Temperature response of 4 , Yogurt

L (T)

Temperature response of 3a

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19546493 A1 [0003]
• - DE 4425306 C1 [0059]
• - DE 19942566 A1 [0059]

Cited non-patent literature

• - DIN 10508 [0002]

Claims (21)

Refrigerated furniture ( 1 ) with one through air ( 3a . 3b . 3c ) refrigerated storage space ( 2 ) for refrigerated goods ( 4 ) and with a measuring system comprising a measuring device with at least one temperature sensor ( 5 ), characterized in that the temperature sensor ( 5 ) with a mass storage ( 6 ) is coupled in such a way that the temperature sensor ( 5 ) the temperature of the mass memory ( 6 ), whereby the mass memory ( 6 ) within the storage room ( 2 ) for the refrigerated goods ( 4 ) is arranged and consists of a material whose cooling behavior of the refrigerated goods ( 4 ) is adjusted. Refrigerated furniture ( 1 ) according to claim 1, characterized in that the mass storage ( 6 ) the temperature sensor ( 5 completely enveloped. Refrigerated furniture ( 1 ) according to claim 1 or 2, characterized in that the mass storage ( 6 ) at least one of a plastic film ( 8th ) coated with a gel ( 9 ) or a liquid-filled pad. Refrigerated furniture ( 1 ) according to one of claims 1 to 3, characterized in that the temperature sensor ( 5 ) between two gel pads ( 6a . 6b ) is glued. Refrigerated furniture ( 1 ) according to claim 1 or 2, characterized in that the mass storage ( 6 ) at least one, in particular metallic, with a gel ( 9 ) or a liquid-filled tube sleeve ( 10 ). Refrigerated furniture ( 1 ) according to one of claims 3 to 5, characterized in that the gel ( 9 ) is a hydrogel or that the liquid consists predominantly of water or of a hydrocarbon or hydrocarbon mixture. Refrigerated furniture ( 1 ) according to one of claims 3 to 6, characterized in that the gel ( 9 ) or the liquid has a solidification range or melting point below 0 ° C, in particular in the range of -15 ° C to -20 ° C, to which the gel ( 9 ) or the liquid in particular contains a freezing point of water-reducing additive, such as a salt or a polyhydric alcohol, in particular sodium chloride, isopropanol or ethylene glycol. Refrigerated furniture ( 1 ) according to one of claims 3 to 7, characterized in that the gel ( 9 ) as gelling agent silicic acid, a polysaccharide, in particular starch, a cellulose derivative, xanthan, guar or locust bean gum, agar agar, gum arabic, alginate, bentonite, chitin, hyaloronic acid or a polyacrylate. Refrigerated furniture ( 1 ) according to one of claims 1 to 8, characterized in that the composite of temperature sensor ( 5 ) and mass storage ( 6 ) a response time, characterized by a thermal coupling time constant (T _K ), between the occurrence of a temperature change of the air ( 3b ) and its display in the measuring device, which is several times greater than a by a thermal sensor time constant (T _F ) characterized response time of the temperature sensor ( 5 ) alone between the occurrence of a change in temperature of the air ( 3b ) and their display in the measuring device. Refrigerated furniture ( 1 ) according to claim 9, characterized in that the thermal coupling time constant (T _K ) of the composite of temperature sensors ( 5 ) and mass storage ( 6 ) is at least approximately equal to a thermal heat transfer time constant (T _W ), which determines the dynamic behavior of the heat transfer from the air ( 3b ) to the refrigerated goods ( 4 ). Refrigerated furniture ( 1 ) according to one of claims 1 to 10, characterized in that the composite of temperature sensor ( 5 ) and mass storage ( 6 ) has approximately the same specific heat capacity (C), the same heat transfer coefficient (α), the same mass (m), the same thermal conductivity (λ) and / or the same surface (A) as the chilled goods ( 4 ). Refrigerated furniture ( 1 ) according to one of claims 1 to 11, characterized in that a quotient of the heat capacity (C ₇ ) and the product of heat transfer coefficient (α ₇ ) and area (A ₇ ) of the composite of temperature sensor ( 5 ) and mass storage ( 6 ) is about as large as a quotient of the heat capacity (C ₄ ) and the product of heat transfer coefficient (α ₄ ) and area (A ₄ ) of the chilled goods ( 4 ). Refrigerated furniture ( 1 ) according to one of claims 1 to 12, characterized in that the Temperaturfüh ler ( 5 ) is a resistance thermometer or a thermocouple. Refrigerated furniture ( 1 ) according to one of claims 1 to 13, characterized in that the composite of temperature sensor ( 5 ) and mass storage ( 6 ) within a storage room ( 2 ), preferably in a mid-height display ( 12 ), integrated or arranged tub ( 13 ) made of plastic or metal, in particular at a height of about 3 to 4 cm above a bottom of the tub ( 13 ) is arranged. Refrigerated furniture ( 1 ) according to one of claims 1 to 14, characterized in that a connecting cable ( 11 ) for the temperature sensor ( 5 ) is guided by a furniture back wall. Refrigerated furniture ( 1 ) according to one of claims 1 to 15, characterized by a further temperature sensor ( 19 ) attached to an evaporator body ( 17 ) a cooling circuit ( 18 ) for the air ( 3a . 3b . 3c ) is arranged. Refrigerated furniture ( 1 ) according to one of claims 1 to 16, characterized by a further temperature sensor ( 16 ) for the cooling air ( 3a ) located in the feed area of the air ( 3a ) in the storage room ( 2 ) for the refrigerated goods ( 4 ) is arranged. Measuring arrangement ( 7 ) with at least one temperature sensor ( 5 ), preferably for a refrigerated cabinet ( 1 ) according to one of claims 1 to 17, characterized in that the temperature sensor ( 5 ) with a mass storage such ( 6 ), that the temperature sensor ( 5 ) the temperature of the mass memory ( 6 ), whereby the mass memory ( 6 ) consists of a material whose cooling behavior corresponds to the cooling behavior of a chilled goods ( 4 ) whose temperature is to be determined. Measuring arrangement ( 7 ) according to claim 18, characterized by the features of the characterizing part of one of claims 2 to 13. Measuring arrangement ( 7 ) according to claim 18 or 19, characterized in that the surface of the mass storage device ( 6 ) consists of a material that in its cooling behavior, in particular the thermal conductivity, the packaging of the goods to be cooled ( 4 ) is adjusted. Measuring arrangement ( 7 ) according to one of claims 18 to 20, characterized in that at least the surface of the mass memory ( 6 ) consists of a polymer, such as a lacquer layer.