EP3076108A1 - Cooling device and method for operating a cooling device - Google Patents

Abstract

The invention relates to a cooling device and a method for operating a cooling device, wherein the cooling device (10) has a goods compartment (12) to be cooled side walls (14), a rear wall (16) and a ceiling element (18) and a bottom element (20) , The cooling device (10) has at least one coolant supply line (22) and a coolant discharge line (24), a heat exchanger (38; 58; 78) connected to the coolant supply line (22) and to the coolant discharge line (24), a coolant delivery device and a fan (40 60; 80) for circulating air cooled over the heat exchanger (38; 58; 78). The flow rate of and the amount of air circulated via the fan (40; 60; 80) can be regulated by at least one control device (42; 62; 82), the flow rate of coolant being determined in accordance with a cooling requirement for the goods compartment (12) and the The amount of air circulated through the fan (40; 60; 80) can be regulated according to the flow rate of the coolant.

Description

The invention relates to a cooling device and a method for operating a cooling device, wherein the cooling device has a goods compartment that is bounded by side walls, a rear wall and a ceiling element and a floor element. About the rear wall opposite side of the goods room of the cooling device is accessible. Such cooling devices are used for example as refrigerated shelves in supermarkets. In the goods room food is stored, which must be cooled. As a rule, foods are stored in such refrigerated shelves, which do not need to be frozen. It is done for this purpose, a cooling in the positive degree range. For cooling, the cooling device is supplied with coolant via a coolant supply line, via which heat is withdrawn from the goods space and thus the goods space is cooled.

Cooling devices are known from the prior art, in addition to a cooling unit and a heat exchanger a Have fan. The fan circulates the cooled air inside the cooler. The fans are operated so that a continuous air flow is established. If there is a greater need for cooling because, for example, new goods are introduced into a cooling device designed as a cooling rack, the cooling capacity must be increased. Furthermore, prior art cooling devices have closing devices with roller blinds, so that the cooling devices can be closed at night, outside of the business. With a closed cooling device there is a lower need for cooling. In order to always ensure sufficient cooling, the flow rate of coolant is changed during operation of the cooling device. At a higher cooling demand, the cooling capacity is increased by a larger amount of coolant is passed through the heat exchanger, so that a larger amount of heat is absorbed via the coolant and led away via Kühlmittelabführleitungen of the cooling device. The cooling device is coupled to a further device, which provides the cooling of the coolant. For example, such a device may be designed as a heat pump.

Out DE 10 2012 018 021 A1 is a refrigerator / freezer with an interior to be cooled and a fan module for supplying or passing air over an evaporation tray known. The task is to provide optimal evaporation, whereby the fan is placed in the immediate vicinity of the evaporation tray, so that optimum evaporation can be achieved. Furthermore, a controller may be provided which controls the fan depending on the humidity.

DE 10 2012 018 021 A1 concerns smaller refrigeration appliances such as refrigerators for private use. Such an arrangement is difficult to use for refrigerated shelves in commercial establishments such as supermarkets.

A disadvantage of the prior art, especially in Kühlregalgen with constantly operated fans that the core temperature of recorded in the goods space and to be cooled goods on a change in the supply of a coolant can be adjusted only insufficient. In order to achieve a desired cooling of the goods, the required average cooling capacity of the heat exchangers increases significantly in conventional refrigerated shelves.

It is therefore an object to provide a cooling device with a heat exchanger and a fan, wherein a faster reaching the core temperature of goods received in a goods space and / or cooling with a lower power are possible.

The object is achieved by a cooling device with the technical features specified in claim 1 and by a method for operating a cooling device with the technical features specified in claim 6. Advantageous developments are specified in the dependent claims in detail.

A cooling device which solves the above-mentioned object comprises a goods space to be cooled with surrounding side walls, a rear wall and a ceiling element and a bottom element, wherein the goods space is at least temporarily accessible via the opposite side of the rear wall. The Cooling device further comprises at least a coolant supply line and a coolant discharge line, a heat exchanger connected to the coolant supply line and the Kühlmittelabführleitung, a coolant conveyor and a fan for circulating cooled over the heat exchanger air, wherein the flow rate of coolant through the coolant conveyor and the amount of the above Fan circulating air can be regulated by at least one control device, and the amount of air circulated through the fan in accordance with the flow rate of coolant is controllable.

If there is an increased need for cooling, for example, when new goods are introduced into the goods space of the cooling device, the delivery rate of coolant is increased by the conveyor and thus also increases the cooling capacity through the heat exchanger. In addition, the amount of air circulated through the fan is increased, allowing faster and more efficient cooling of the product. Especially in the case of food refrigeration appliances, it is important that the goods received in the refrigeration facilities have a certain core temperature and that this is achieved quickly. In the case of the cooling device described here, the volume flow of the cooled air via the fan is also increased, in particular when increasing the mass flow of coolant. In the case of the cooling devices known from the prior art, the volumetric flow of cooled air also remains constant when increasing a mass flow of coolant. This leads in the prior art to the fact that the core temperature of the goods is reached only after a longer period of time and by an increased coolant mass flow. In contrast, the cooling device described herein makes it possible to use a smaller one Coolant mass flow to achieve a desired core temperature of the product or to shorten the time to reach the desired core temperature, the energy consumption is reduced compared to conventional cooling devices.

The cooling device may have at least two cooling regions which are arranged next to one another, wherein each cooling region is assigned at least one coolant delivery device, a heat exchanger and a fan. Furthermore, each cooling area can be assigned a separate control device. This can be used to map different cooling areas for different goods within a cooling device. For each group of different goods, targeted cooling can be achieved in one of the cooling areas via an adjustable mass flow of the coolant and an adjustable volume flow of the cooled air. In cooling devices, for example, dairy products are stored within a cooling device next to sausage or meat products. Different core temperatures are required for the different product types. By designing the cooling device with several cooling regions, core temperatures adapted to the respective product type can be adjusted energy-efficiently and quickly. The targeted circulation of air also makes it possible to separate the cooling areas from each other. The arrangement of the components and the formation of the ceiling element and the bottom element and the rear wall, on which preferably the coolant conveyor and the heat exchanger and the fan are arranged, takes place such that an air flow from the ceiling element adjusts to the bottom element. As a result, adjacent cooling regions can be formed which do not influence one another. The cooling device can be specially designed for this purpose Have flow channels, air guide elements and air outlet areas or nozzles and air inlet areas.

The coolant delivery device may be a speed-controlled pump and / or the fan may be a speed-controlled fan. The pump is preferably a decentralized downstream of the cooling device arranged pump and controls the amount or the mass flow of the heat exchanger supplied coolant. The flow rate is adjusted via the control unit by changing the speed of the pump. If the speed of the coolant pump is changed, the speed of the fan is changed immediately via the control unit, so that an increased volume flow of cooled air is circulated. The design and arrangement of the central pump can be analogous to that in the German patent application with the file number 10 2015 104 901.5 done manner described.

The cooling device may further comprise a closing device, which is designed to close the rear wall opposite side. In supermarkets, refrigerated shelves are usually open on one side, so that the goods can be removed from the shelves. If the supermarkets are closed and therefore no sale of the goods is done, the cooling devices are closed, for example via blinds. In a closed state, a lower cooling capacity is needed because there is no exchange of air within the goods room with the ambient air in the supermarket. In addition, the cooling devices are no longer taken goods and no new goods handed over. In a so-called night mode, the delivery rate of coolant is usually reduced. at The cooling means described herein is then also the volume flow of the at least one fan reduced, resulting in a lower power consumption.

The above object is also achieved by a method for operating a cooling device, wherein the cooling device comprises a goods to be cooled goods compartment surrounding side walls, a rear wall and a ceiling element and a bottom element, wherein the goods space on the rear wall opposite side is at least temporarily accessible, wherein the cooling device comprises at least one coolant supply line and a coolant discharge line, a heat exchanger connected to the coolant supply line and to the coolant discharge line, a coolant delivery device and a fan for circulating air cooled by the heat exchanger. In the method, the flow rate of coolant through the coolant conveyor and the amount of air circulated through the fan via at least one control device is regulated, wherein the flow rate of the coolant via the coolant conveyor in accordance with a cooling demand for the goods space and the amount of circulated through the fan air be regulated in accordance with the flow rate of the coolant.

In the method, the mass flow of coolant is regulated in accordance with the cooling requirement for the goods received in the goods space and regulated as a function of the mass flow of the volume flow of the cooled air. Due to the adaptation of the volume flow, lower cooling capacities via the heat exchanger are required to achieve a specific core temperature for the goods received in the goods compartment. Furthermore, on the adaptation of the volume flow of cooled Air the time to reach the core temperature can be shortened. The operation of the cooling device can therefore be energy-efficient, wherein the total power consumption of the components is lower than in cooling devices of the prior art, in which the achievement of a certain core temperature for goods received in the goods space is carried out only via an adjustment of the cooling capacity through the heat exchanger.

The cooling device may have at least two cooling regions arranged side by side, wherein each cooling region is associated with at least one control device, a coolant delivery device, a heat exchanger and a fan, and wherein the coolant delivery devices and the fans of adjacent regions within the cooling device are independently controlled. The adjacent regions can thus be cooled differently, each cooling region being supplied with a different mass flow of coolant from the adjacent cooling region and a different volume flow of cooled air. As a result, different core temperatures can be provided for different product groups within a cooling device.

The coolant delivery device may be a speed-controlled pump and / or the fan may be a speed-controlled fan, wherein the flow rate of the coolant and / or cooled air by a change in the rotational speed of the pump and / or the fan can be adjusted. About the at least one control unit, the mass flow of coolant and the volume flow of cooled air in accordance with a core temperature to be reached for the respective cooling area assigned goods and the values recorded via measuring devices. The required cooling demand and thus the required mass flow of coolant and the required volume flow of cooled air can be determined for example in advance and store for a specific occupancy of the cooling device with goods. In addition, it is possible to draw conclusions about the required cooling capacities or the cooling provided via the temperature of the coolant and / or the cooled air in a supply line and the temperature of the coolant and the cooled air in a return line. In all the embodiments described herein, the cooling device has a multiplicity of measuring devices that are designed to detect at least the temperature in the coolant supply lines and coolant discharge lines. In addition, the temperature of the recirculated air can be detected before passing through the heat exchanger and after being cooled by the heat exchanger. The control unit then outputs a signal for changing the mass flow of coolant to the coolant conveying device and the volume flow to the fan as a function of the detected temperatures.

The coolant delivery device may be a speed-controlled pump and / or the fan may be a speed-controlled fan, wherein the flow rate of coolant and / or cooled air by a change in the speed of the pump and / or the fan can be adjusted. The control unit can in this case output a signal to the fan or the pump, via which the speed of the fan and the pump are changed.

The cooling device may further comprise a closing device, which is designed to close the rear wall opposite side, wherein the flow rate of coolant and cooled air are controlled in accordance with an open or closed position of the closing device. In the aforementioned night mode, the cooling capacity is reduced via the heat exchanger and thus the amount of coolant supplied via the pump and also reduces the speed of the fan. The change in the rotational speed of the pump and the speed of the fan always takes place depending on the core temperature to be achieved for the goods received in the goods space, wherein in a night mode with, for example, a closed blind a lesser or substantially no heat transfer between the cooled air in the goods compartment and the air surrounding the cooling device, for example a sales room, takes place.

The flow rate of cooled air can be increased, in particular, when the flow rate of coolant is increased. In addition, in the method, the delivery rate of cooled air in accordance with the mass flow of coolant can be controlled so that the volume flow of cooled air through the fan is also increased if no increase in the mass flow of coolant. For example, with a smaller increase in the coolant temperature in the return line in the coolant return line, the required additional cooling capacity can be provided by an increased volume flow of cooled air. In a further embodiment, the volume flow of cooled air via the fan can only be increased if the temperature in the return in a coolant supply line exceeds a definable threshold. The difference between the normally required cooling capacity and the increased cooling capacity is provided solely via the additional flow rate of coolant. The volume flow of cooled air through the fan is only increased if the cooling demand exceeds a determinable amount. For example, when the temperature of the coolant rises and exceeds a definable threshold.

The cooling device of the variants described above and below may also have a central control / control unit which controls the operation of the individual components and communicates with the components. The control unit can also control the communication between the individual components. In addition to temperature sensing devices, further measuring devices may be provided, such as devices for measuring the flow rate and the mass flow of the coolant.

The heat exchanger of a cooling device of the variants described herein may for example be a plate heat exchanger. As a coolant, a brine can be used, wherein the brine can be a water-glycol mixture. In principle, all provided for refrigeration systems coolant can be used.

The cooling device has ventilation openings or ventilation slots on the floor element and on the ceiling element in the region which is designed to be open. Cooled air flows out via ventilation openings on the ceiling element and returns via the ventilation openings in the floor element back into the cooling device. The cooling device points to circulation the air flow channels in the bottom element, the ceiling element and the rear wall. Above the at least one fan, the air taken up in the channels is circulated, so that the cooled air flows along the rear wall and the floor element and the ceiling element and exits through the ventilation openings and exits again. This provides cooling of the walls of the cooling device and cooling of the goods space via the air flow.

Further advantages, features and design options will become apparent from the following description of the figures of non-limiting embodiments to be understood.

Fig. 1

eine schematische Darstellung einer Kühleinrichtung mit drei Kühlbereichen;

Fig. 2

eine schematische Schnittansicht durch eine Kühleinrichtung; und

Fig. 3

eine weitere schematische Schnittansicht durch eine Kühleinrichtung mit einem geschlossenen Rollo.

In the drawings shows:

Fig. 1

a schematic representation of a cooling device with three cooling areas;

Fig. 2

a schematic sectional view through a cooling device; and

Fig. 3

a further schematic sectional view through a cooling device with a closed blind.

Correspondingly, in the drawings with like reference numerals, substantially each other, unless otherwise specified. Further, it is omitted to describe components that are not essential to understanding the teachings disclosed herein.

With reference to the Fig. 1 to 3 In the following, a cooling device 10 is described which is used for cooling various goods 92 is formed. The goods 92 may include, for example, dairy products, meat or sausage products and / or fruits and vegetables.

The cooling device 10 has a goods compartment 12, which is surrounded by two side walls 14 of a rear wall 16 and a ceiling element 18 and a bottom element 20. The side walls 14, the rear wall 16, the ceiling element 18 and the bottom element 20 are formed analogously to the known from the prior art cooling devices. Therefore, these parts are at least on their goods compartment 12 side facing formed so that a cooling of the goods space 12 can be performed, from outside the cooling device 10 on the rear wall 16, the ceiling element 18, the bottom member 20 and the side walls 14 no or only a low heat transfer occurs. The cooling device 10 has three cooling regions 30, 50 and 70. These cooling areas 30, 50 and 70 are shown schematically by the dashed line. The cooling device 10 is designed so that the individual cooling areas 30, 50 and 70 need not be separated by partitions. About the formation of the cooling device 10, it is possible to operate the individual cooling areas 30, 50 and 70 independently and with different temperatures.

The first cooling device 30 has at least one pump 34, a cooling unit 36 and a control device 42. In addition, measuring devices 32 and 44 are provided. About the measuring devices 32 and 44, the temperature and the flow rate of coolant can be detected. The cooling unit 36 has at least one fan 40 and a plate heat exchanger 38. For cooling the cooling area 30 is over a central Kühlmittelzuführleitung 22 a coolant via the pump 34 to the heat exchanger 38 is supplied. Heat of the goods space 12 is received in the cooling area 30 via the heat exchanger 38, and the heated coolant is fed via a coolant discharge line to a central coolant discharge line 24. The speed of the pump 34 is controlled by the control device 42. Further, the speed of the fan 40 is controlled by the controller 42. For this purpose, depending on the rotational speed of the pump 34, the control of the rotational speed of the fan 40. The measuring devices 32 and 44 may also be connected to the control device 42. The control device 42 is also transmitted data such as the temperature of the coolant in the flow and return and the flow rate of the coolant. The control device 42 is in this case designed to control the temperature in the cooling region 30. Unlike in Fig. 1 As shown, a central control unit may also be provided, which is coupled to the respective control devices 42, 62 and 82.

The coolant is supplied via the Kühlmittelzuführleitung 22 with a certain flow temperature. The pump 34 controls the flow rate of the coolant in response to a cooling demand. If the speed of the pump 34 is increased to increase the mass flow of coolant, the speed of the fan 40 is also increased via the control device 42. This results in a larger volume flow of cooled air in the goods space 12 and in particular in the cooling area 30. About the measuring device 44, the return temperature of the coolant is detected. If the return temperature rises above a certain level or exceeds a threshold value, the controller 42 causes the increase the speed of the pump 34 and the increase in the speed of the fan 40. Compared to the known from the prior art cooling devices in which the speed of the fan is not increased, the speed of the pump 34 in the cooling device 10 described herein may be less strong increase. However, if the rotational speed of the pump 34 is increased to an equal degree, as is done in the prior art, for example, increasing the rotational speed of the fan 40 will cause the cooled air to circulate to a greater extent, so that a faster cooling of goods 92 is achieved.

The plates of the heat exchanger 38 may include, for example, areas of the rear wall 16 or abut areas of the rear wall 16. In addition, the fan 40 is arranged so that the conveyed via the fan 40 air is cooled via the heat exchanger 38.

Analogously to the first cooling region 30, the second cooling region 50 has at least one pump 54, a cooling unit 56 with a heat exchanger 58 and a fan 60, as well as a control device 62 and measuring devices 52, 54 and 66. The third cooling area 70 has, analogously to the first cooling area 30 and the second cooling area 50, at least one pump 74, a cooling unit 76 with a heat exchanger 78 and a ventilator 80 as well as a control device 82. In addition, the third cooling area 70 has measuring devices 72, 84 and 86. The pumps 34, 54 and 74 are connected to the central and common coolant supply line 22. In addition, the return lines of the respective cooling regions 30, 50 and 70 are connected to a central and common coolant discharge line 24. The coolant supply line 22 and the coolant discharge line 24 are provided with a cooling device, such as For example, a heat pump connected. The coolant is brought to a certain flow temperature via the heat pump.

The design of the individual cooling regions 30, 50 and 70 ensures that a specific cooling can be achieved independently of the other cooling regions 30, 50 and 70 for the respective cooling region 30, 50 or 70. For this purpose, both the pumps 34, 54 and 74 in their speed independently of each other via the control device 42, 62 and 82 and the speed of the fans 40, 60 and 80 are controlled. At the in Fig. 1 For example, a core temperature for 2 degrees Celsius taken up in the cooling area 30 may be achieved, wherein in the second cooling area 50 a core temperature for goods 92 of 4 degrees Celsius and in the third cooling area 70 a core temperature for goods 92 of 3 degrees Celsius can be adjusted. The increase in the speed of the fans 40, 60 and 80 with an increase in the speed of the pumps 34, 54 and 74 supports the cooling of the goods 92 received in the goods space 12, so that the core temperature of the goods 92 is reached faster. Per unit of time then flows over a larger air flow, the goods 92, with a larger amount of heat is dissipated by the goods 92 and the goods 92 are cooled. In contrast, at lower volume flows of cooled air, the air until it reaches the bottom of the goods room 12 heated more. The heat absorption capacity is therefore lower. In addition, the amount of cooled air is lower, so that the time to reach the desired core temperature is greater than an increased volume flow of cooled air via an increase in the rotational speed of the fans 40, 60 and 80th

Fig. 2 shows a schematic sectional view through a cooling device 10. In Fig. 2 the cooling device 10 is shown with respect to the third cooling region 70. The cooling device 10 has two connections 88 and 90 on the ceiling element 18. The port 88 is connected to the coolant supply line 22 and the port 90 is connected to the coolant discharge line 24. The arrows show the flow direction of the coolant. On the rear wall 16 or within a rear wall arrangement, the schematically illustrated pump 74 and the cooling unit 76 shown schematically are arranged. The control device 82 is arranged on the outside of the rear wall 16. It is noted, however, that the in Fig. 2 is shown schematically and only one embodiment shows a variety of variants. For example, the control device 82 may also be arranged within the cooling device 10 in different positions. About the dashed lines, the control lines between the controller 82 and the pump 74 and the cooling unit 76 are shown. The flow and the return line for the coolant are also indicated schematically. The measuring devices 72, 84 and 86 are in Fig. 2 not shown. The arrangement of the cooling unit 76 may also be different than in Fig. 2 shown done. Only the arrangement of the pump 74 in front of the cooling unit 76 in the coolant flow direction is required for the cooling device 10, so that the supply of coolant to the heat exchanger 78 can be controlled or regulated in accordance with a cooling demand via the pump 74. Areas of the rear wall assembly facing the goods compartment 12 may be coupled to the heat exchanger 78 or be part of the heat exchanger 78. The fan 80 is arranged so that air over the heat exchanger 78 is guided and thereby cooled. The flow direction of the air is shown partly schematically by the arrow 96. For this purpose, the cooling device 10 within the cooling device 10 extending cooling channels. Furthermore, the cooling device 10 on the ceiling element 18 on an outlet opening or an outlet region for cooled air. The cooled air flows downwards through this upper outlet region, as shown by the arrow 96, and is drawn in via an air inlet opening on the base element 20 via the fan 80. The fan 80 carries the heated air through the heat exchanger 78 and back to the ceiling member 18, with the cooled air flowing along the rear wall and therefore also cooling the rear wall assembly. There is a circulation of air through the cooling chamber 12 in the direction indicated by the arrow 96 direction. If an increased cooling demand is detected for the goods 92 received in the goods compartment 12, the speed of the pump 74 is increased, so that a larger mass flow of coolant is supplied to the heat exchanger 78. In addition, the speed of the fan 80 is increased via the control device 82, whereby a larger volume flow of cooled air sets. The cooled air does not heat up so much at a higher volume flow, so that even in a lower region of the goods compartment 12 heat can still be absorbed.

In addition to a circulation of the air over the goods space 12 and the bottom element 20, the rear wall arrangement and the ceiling element 18, the rear wall arrangement may have opening slots on the side facing the goods space 12, so that cooled air can also flow into the goods space 12 via this. Also, the ceiling element 18, the bottom element 20 and the Side walls may have openings through which air can flow in and out.

The cooling device 10 also has a closing device 94. The closing device 94 serves to close the goods space 12, so that no or only a small heat exchange between the air in the goods space 12 and the goods 92 takes place in the goods space 12 and the environment surrounding the cooling device 10.

Fig. 3 shows a schematic section through the cooling device 10 with a closed goods space 12. For this purpose, a roller blind 98 is shut down, which closes the goods space 12. The roller blind 98 may be formed insulating to reduce or prevent heat exchange between the goods compartment 12 and the environment of the cooling device 10. Since a lesser heat input into the goods space 12 takes place over the surroundings of the cooling device 10, there is also a reduced need for cooling. Accordingly, the speed of the pump 74 is reduced and immediately the speed of the fan 78. The speed of the fan 80 is always adjusted to the flow rate of the pump 74. At a high flow rate of the pump 74 and the pumps 34 and 54, the fans 40, 60 and 80 are driven accordingly. Increasing the volume flow through the fans 40, 60 and 80 causes a faster cooling of the goods compartment 12 and especially of the goods 92 received in the goods compartment 12. Via the fans 40, 60 and 80, a larger volume flow of cooled air through the goods compartment 12 guided, a lower reduction of the flow temperature of the coolant is required to achieve a higher cooling performance, for example, when introducing new product 92. In conventional Cooling devices of the prior art, the flow temperature must always be greatly reduced when new goods 92 are introduced. In contrast, the cooling devices 10 and methods for operating the cooling devices 10 described herein also allow cooling of new goods 92 introduced into the goods space 12, with a lower reduction of the flow temperature of the coolant. In addition or alternatively, if the flow temperature of the coolant is lowered, the lowering can take place the core temperature of the goods 92 are performed faster than in cooling devices of the prior art. Therefore, the reduction of the flow temperature of the coolant must be carried out over a shorter period of time than in cooling devices of the prior art. This has a particularly cost-effective for the operation of the cooling device 10. In addition, the components such as the pumps 24, 54 and 74 may have a lower flow rate, when a larger volume flow of cooled air is passed through the goods space 12 via the fans 40, 60 and 80.

LIST OF REFERENCE NUMBERS

10

cooling device

12

goods space

14

Side wall

16

rear wall

18

ceiling element

20

floor element

22

coolant supply line

24

coolant discharge

30

cooling area

32

measuring device

34

pump

36

cooling unit

38

heat exchangers

40

fan

42

control device

44

measuring device

50

cooling area

52

measuring device

54

pump

56

cooling unit

58

heat exchangers

60

fan

62

control device

64

measuring device

66

measuring device

70

cooling area

72

measuring device

74

pump

76

cooling unit

78

heat exchangers

80

fan

82

control device

84

measuring device

86

measuring device

88

connection

90

connection

92

Would

94

closing

96

arrow

98

roller blind

100

arrow

Claims (10)

Cooling device with a side walls (14) surrounding a goods compartment (12), a rear wall (16) and a ceiling element (18) and a bottom element (20), wherein the goods compartment (12) over the rear wall (16) opposite side at least temporarily at least one coolant supply line (22) and a coolant discharge line (24), a heat exchanger (38; 58; 78) connected to the coolant supply line (22) and to the coolant discharge line (24), a coolant delivery device and a fan (40; 80) for circulating air cooled by the heat exchanger (38; 58; 78) - The flow rate of coolant through the coolant conveyor and the amount of the fan (40; 60; 80) circulated air via at least one control device (42; 62; 82) are adjustable, and - The amount of the fan (40; 60; 80) circulated air in accordance with the flow rate of coolant is adjustable. Cooling device according to claim 1, wherein the cooling device (10) has at least two cooling regions (30; 50; 70) arranged side by side, wherein each cooling region (30; 50; 70) comprises at least one coolant delivery device, a heat exchanger (38; 58; 78 ) and a Fan (40; 60; 80) are assigned. Cooling device according to claim 1 or 2, wherein the coolant conveying device is a speed-controlled pump (34; 54; 74). Cooling device according to one of claims 1 to 3, wherein the fan (40; 60; 80) is a speed-controlled fan. Cooling device according to one of claims 1 to 4, comprising a closing device (94) which is adapted to close the opposite side of the rear wall (16). Method for operating a cooling device, which has a goods compartment (12) to be cooled surrounding side walls (14), a rear wall (16) and a ceiling element (18) and a bottom element (20), wherein the goods space (12) over the the rear wall ( 16) opposite side is at least temporarily accessible, wherein the cooling device (10) at least one Kühlmittelzuführleitung (22) and a Kühlmittelabführleitung (24), one with the Kühlmittelzuführleitung (22) and with the Kühlmittelabführleitung (24) connected to the heat exchanger (38; 58; ), a coolant conveyor and a fan (40; 60; 80) for circulating air cooled over the heat exchanger (38; 58; 78), and wherein - The flow rate of coolant through the coolant conveyor and the amount of the fan (40; 60; 80) circulated air via at least one control device (42; 62; 82) are adjustable, - The flow rate of coolant through the coolant conveyor in accordance with a cooling demand for the goods space (12) is controlled, and - The amount of air circulated through the fan (40; 60; 80) is regulated according to the flow rate of the coolant. Method according to claim 6, wherein the cooling device (10) has at least two cooling regions (30; 50; 70) arranged side by side, wherein each cooling region (30; 50; 70) comprises at least one control device (42; 62; 82) And wherein the coolant conveyors and the fans (40; 60; 80) of adjacent areas (30; 50; Cooling device (10) are controlled independently. Method according to claim 6 or 7, wherein the coolant delivery device is a speed-controlled pump (34; 54; 74) and / or the fan (40; 60; 80) is a speed-controlled fan, and wherein the delivery rate of coolant and / or of cooled air a change in the speed of the pump (34; 54; 74) and / or the fan (40; 60; 80) can be adjusted. Method according to one of claims 6 to 8, wherein the cooling device (10) has a closing device (94) which is adapted to close the side opposite the rear wall (16), and wherein the flow rate of coolant and cooled air are controlled in accordance with an opening or closing position of the closing device (94). The method according to any one of claims 6 to 9, wherein the flow rate of cooled air is increased as the flow rate of coolant is increased.

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