ES2841347T3 - Refrigeration installation and operation procedure of a refrigeration installation - Google Patents

Abstract

Refrigeration installation with side walls (14) surrounding a merchandise space (12) to be cooled, a rear wall (16) as well as a ceiling element (18) and a floor element (20), the merchandise space being (12) accessible, at least temporarily, through the side opposite the rear wall (16), which has at least one refrigerant supply conduit (22) and a refrigerant discharge conduit (24) and heat exchangers ( 38; 58; 78) connected to the refrigerant supply conduit (22) and the refrigerant discharge conduit (24), refrigerant transport devices and fans (40; 60; 80) for the circulation of cooled air through the heat exchangers (38; 58; 78), - the cooling installation (10) having at least two cooling zones (30; 50; 70) arranged side by side, each cooling zone (30) being assigned ; 50; 70) at least one refrigerant transport device, an inter heat exchanger (38; 58; 78) and a fan (40; 60; 80), characterized in that - the refrigerant flow can be regulated through the refrigerant transport devices and the air flow circulated by the fans (40; 60; 80 ) can be regulated through at least one regulating device (42; 62; 82), - the air flow circulated by the fans (40; 60; 80) can be regulated as a function of the refrigerant flow, and because - the refrigerant transport devices are speed controlled pumps (34; 54; 74).

Description

DESCRIPTION

refrigeration installation and the operating procedure of a refrigeration installation

A refrigeration installation and a method of operating a refrigeration installation are described, in which the refrigeration installation has a goods space delimited by side walls, a rear wall, as well as a ceiling element and a floor element. The goods area of the refrigeration system is accessible from the side opposite the rear wall. These refrigeration devices are used, for example, as refrigerated shelves in supermarkets. In the merchandise space, food is stored that must be refrigerated. Generally, these refrigerated shelves store food that does not require freezing. Cooling takes place in the range of positive degrees. For refrigeration, a refrigerant is supplied to the refrigeration installation via a refrigerant supply conduit through which heat is removed from the goods space, whereby the goods space is cooled.

Cooling devices are known from the state of the art which, in addition to a cooling unit and a heat exchanger, comprise a fan. Through the fan, the cooled air circulates inside the cooling installation. The fans operate in a way that produces a continuous flow of air. If there is an increased need for refrigeration, for example due to the introduction of new products in a refrigeration installation designed as a refrigeration shelf, the refrigeration capacity must be increased. Furthermore, the cooling devices according to the state of the art have shutters with shutters, whereby the cooling devices can be closed at night, outside of business hours. When the cooling installation is closed, the need for cooling is less. To ensure sufficient cooling at all times, the coolant flow is varied during the operation of the cooling installation. In the case of a higher demand for cooling, the cooling capacity is increased by passing a greater quantity of refrigerant through the heat exchanger, thereby also absorbing a greater quantity of heat through the refrigerant, which is removed away from the heating installation. cooling through refrigerant discharge ducts. The refrigeration installation is coupled to another device for cooling the refrigerant. Such a device can be designed, for example, in the form of a heat pump.

From DE 102012 018 021 A1 a refrigerator / freezer is known with an internal space to be cooled and with a fan module for the supply and transfer of air through an evaporation tray. The objective is to provide optimum evaporation, for which the fan is arranged in the immediate vicinity of the evaporation tray, so that optimum evaporation can be achieved. Furthermore, a control system can be provided that controls the fan as a function of the humidity of the air.

DE 102012018021 A1 relates to smaller refrigeration devices such as refrigerators for private use. This type of appliance is usually not suitable for use on refrigerated shelves in commercial establishments such as supermarkets.

Document DE 102 35 783 A1 discloses a cooling installation comprising a fan and a control method thereof, it being possible to regulate the number of revolutions of the fan in a variable way. The number of revolutions of the fan is set depending on the relative switching cycle of a compressor for the refrigeration appliance configured as an air conditioner.

Document DE 202008000 757 U1 describes a cooler with a fan to generate an air flow in a compartment of the cooler to be cooled, the cooler having detection elements for recording at least one parameter, as well as a configured control or regulation unit so that the number of fan revolutions changes depending on at least one measured parameter.

US 4,800,729 A discloses a refrigeration system having a storage space for goods, providing a fan for air circulation.

US 2005/0126196 A1 discloses a refrigerated storage shelf provided with a plurality of refrigeration units arranged side by side.

The drawback observed according to the state of the art, in particular in the refrigerated shelves with fans of constant operation, is that the internal temperature of the products introduced for their refrigeration in the merchandise space can only be insufficiently regulated by a change in the contribution of refrigerant. In order to achieve the desired cooling of the products, the required average cooling capacity of the heat exchangers is greatly increased on conventional cooling racks.

Therefore, it is a question of proposing a refrigeration installation with a heat exchanger and a fan, which allows the internal temperature of the products placed in a merchandise space and / or the refrigeration with a lower power to be reached more quickly.

The task is solved by means of a refrigeration installation with the technical characteristics indicated in claim 1 and by means of an operating procedure of a refrigeration installation with the following Technical characteristics indicated in claim 4. Other advantageous embodiments are described in detail in the dependent claims.

A refrigeration installation that solves the aforementioned task comprises a merchandise space to be cooled with surrounding side walls, a rear wall, as well as a ceiling element and a floor element, in which the merchandise space is accessible at least temporarily by the side opposite the rear wall. The refrigeration installation further has at least one refrigerant supply conduit and a refrigerant discharge conduit, heat exchangers connected to the refrigerant supply conduit and the refrigerant discharge conduit, refrigerant transport devices and fans for circulation. of the air cooled through the heat exchangers, it being possible to regulate the quantity of refrigerant supplied through the refrigerant transport devices and the quantity of air that circulates through the fans through at least one regulation device and the quantity of air circulating through the fans depending on the amount of refrigerant supplied.

If the demand for refrigeration increases, for example, when new products are introduced into the goods space of the refrigeration installation, the rate of supply of refrigerant through the conveying devices of the respective respective refrigeration zone increases and increases. therefore also the cooling capacity through the heat exchanger. In addition, the amount of air circulating through the fans is increased so that faster and more efficient cooling of the products can take place. Especially in the case of food refrigeration devices, it is important that the products placed in the refrigeration devices have a certain internal temperature and that this temperature is reached quickly. In the cooling installation described here, the volumetric flow rate of the cooled air through the fan is also increased, especially when the flow rate of the refrigerant is increased. In the case of the refrigeration installation according to the state of the art, the volumetric flow rate of the cooled air remains constant even when the flow rate of the refrigerant is increased. In the state of the art this results in the internal temperature of the products being reached only after a longer period of time and as a consequence of a higher mass flow of refrigerant. On the other hand, the refrigeration installation described here makes it possible to reach a desired internal temperature of the products with a lower refrigerant flow rate or to shorten the time to reach the desired internal temperature, thereby reducing the energy input compared to the conventional cooling devices.

The cooling installation furthermore has at least two cooling zones arranged side by side, each cooling zone being assigned at least one refrigerant transport device, a heat exchanger and a fan. Furthermore, a separate regulating device can be associated with each cooling zone. Through it, different cooling zones can be represented for different products within a cooling installation. For each group of different products in one of the cooling zones, specific cooling can be achieved through an adjustable mass flow of the refrigerant and an adjustable volume flow of the cooled air. In the refrigerated display cases, for example, dairy products are placed next to cold cuts or meat products. Different types of products require different internal temperatures. By designing the refrigeration unit with multiple cooling zones, the internal temperatures adapted to the respective product type can be adjusted quickly and with energy efficiency. Selective air circulation also allows the cooling zones to be separated from each other. The arrangement of the components and the design of the roof element, as well as the floor element and the rear wall, in which the refrigerant transport devices and heat exchangers are preferably arranged, as well as fans, are carried carried out so that an air flow is established from the ceiling element to the floor element. In this way, cooling zones can be created next to each other, without influencing each other. For this, the cooling installation can have flow channels, air guide elements, as well as specially designed outlet zones or nozzles or air nozzles and air inlet zones.

The refrigerant transport devices are speed controlled pumps, it being possible for the fans to be speed controlled fans. The pumps are preferably pumps arranged decentrally behind the refrigeration installation and control the quantity or flow of the refrigerant supplied to the heat exchangers. The flow is regulated through the regulating unit by changing the number of revolutions of the pumps. By changing the number of revolutions of the refrigerant pumps, the number of revolutions of the fans is immediately changed by the control unit, the speed of the fans, so that the flow of cooled air is higher. The design and arrangement of the central pumps can be produced in a manner analogous to that described in the German patent application with the file number 102015 104901.5.

The cooling installation can furthermore have a closing device configured to close the side opposite the rear wall. In supermarkets, refrigerated shelves are usually open on one side so that products can be removed from the shelves. When supermarkets close and product sales are no longer taking place, the refrigeration facilities are closed, for example, with shutters. In the closed state, the necessary cooling capacity is lower, since there is no exchange of air within the merchandise space with the ambient air of the supermarket. In addition, no more products are withdrawn from the refrigeration facilities and no new products are introduced. As a general rule, during the so-called night hours, the refrigerant flow is reduced. In the cooling installations described here, the flow rate of the fans is also reduced, thereby reducing energy consumption.

The aforementioned task is also solved by a method of operating a refrigeration installation, in which the refrigeration installation has side walls surrounding the space of goods to be refrigerated, a rear wall, as well as a roof element and an element. floor, in which the goods space is accessible at least temporarily from the side opposite the rear wall, in which the refrigeration installation comprises at least one refrigerant supply conduit and a refrigerant discharge conduit, heat exchangers heat connected to the refrigerant supply conduit and the refrigerant discharge conduit, refrigerant supply elements and fans for circulating the cooled air through the heat exchangers. In this procedure, the amount of refrigerant that is supplied through the refrigerant transport devices and the amount of air that circulates through the fans are regulated by means of at least one regulating device, adjusting the amount of refrigerant that is supplied through the refrigerant transport devices based on a cooling demand for the goods space and the amount of air circulating through the fans based on the amount of refrigerant.

With this method, the mass flow of the refrigerant is regulated according to the cooling demand of the products placed in the goods space and the flow rate of cooled air is regulated as a function of the mass flow. By adjusting the flow rate, a lower cooling capacity is required through the heat exchangers to achieve a certain internal temperature for the products placed in the goods space. By adapting the flow rate of the cooled air, the time to reach the internal temperature can also be reduced. Therefore, the operation of the refrigeration installation can be efficient from the energy point of view, the total energy consumption of the components being lower than that of the refrigeration installations according to the state of the art, in which the achievement of A certain internal temperature for products placed in the goods space is only achieved by adjusting the cooling capacity through the heat exchanger.

The cooling installation has at least two cooling zones arranged side by side, each cooling zone being assigned at least one regulating device, a coolant supply device, a heat exchanger and a fan and the devices being controlled. supply of refrigerant and the fans of the adjoining areas independently of each other within the cooling installation. Therefore, adjacent cooling zones can be cooled differently, it being possible to provide each cooling zone with a different refrigerant flow rate than the adjacent cooling zone and a different cooled air flow rate. In this way different internal temperatures can be provided for different groups of products within a refrigeration installation.

The refrigerant transport devices are speed controlled pumps, it being possible for the fans to be speed controlled fans. The flow of refrigerant is regulated by changing the number of revolutions of the pumps, while the flow of cooled air can be regulated by changing the number of revolutions of the fans. Through the at least one control unit, the refrigerant flow rate and the cooled air flow rate are regulated in accordance with an internal temperature to be reached for the products assigned to the respective cooling zone and the values detected through devices. measurement. The required cooling capacity and consequently the required refrigerant flow rate and cooled air flow rate can be determined, for example, in advance, and stored for a given occupation of the cooling installation by the products. It is also possible to draw conclusions about the required cooling capacities or about the cooling provided through the temperature of the coolant and / or cooled air in a forward flow and the temperature of the coolant and cooled air in a return flow. . In all the embodiments described here, the cooling installation has a plurality of measuring devices configured to register at least the temperature in the coolant supply and discharge lines. The temperature of the circulating air can also be recorded before cooling through heat exchangers and after cooling through heat exchangers. In this case, the control unit transmits a refrigerant flow change signal to the refrigerant transport device and a flow change signal to the fans, as a function of the recorded temperatures.

The refrigerant transport devices are speed controlled pumps, it being possible for the fans to be speed controlled fans and for the refrigerant flow to be regulated by changing the number of revolutions of the pumps and the flow of cooled air by changing the number of revolutions of the fans. The control unit can transmit a signal to the fans or pumps through which the speed of the fans and pumps is changed.

The refrigeration installation can furthermore have a closing device configured to close the side opposite the rear wall, the flow of refrigerant and cooled air being regulated according to an opening or closing position of the closing device. During the aforementioned night hours, the cooling capacity is reduced through the heat exchangers and, consequently, the amount of refrigerant supplied through the pumps, as well as the number of revolutions of the fans. The change in the number of revolutions of the pumps and fans always occurs as a function of the internal temperature that must be reached for the products placed in the goods space, so that during night hours, in which the space is closed, for example, with a shutter, no heat transfer is recorded between the cooled air in the merchandise space and the air surrounding the refrigeration facility, for example in a sales area.

The cooled air flow rate can be increased especially when the refrigerant flow rate is increased. Furthermore, in the process, the flow rate of cooled air can also be controlled according to the flow rate of the refrigerant, so that the flow rate of cooled air through the fans is increased even under the assumption that there is no increase in temperature. refrigerant flow rate. For example, if a lower return flow refrigerant temperature rise occurs in the refrigerant return line, the additional cooling capacity required can be provided by a higher flow rate of cooled air. In another embodiment it is also possible that the flow rate of cooled air through the fans in the respective cooling zones is only increased if the temperature of the return flow in a coolant supply duct exceeds a determinable threshold value. In this case, the difference between the normally required cooling capacity and the increased cooling capacity is provided only through the additional flow of refrigerant. The flow rate of cooled air through the fan increases only when the demand for cooling exceeds a determinable value. For example, when the coolant temperature rises and exceeds a determinable threshold.

The cooling installation of the variants described above and below can also have a central regulation / control unit that controls the operation of the various components and communicates with the components. The regulation / control unit can also control the communication between the different components. In addition to the temperature recording devices, other measuring devices can be provided, such as, for example, devices for measuring the flow rate and the flow rate of the coolant.

The heat exchangers of a refrigeration plant of the variants described here can be, for example, plate heat exchangers. Saline water can be used as coolant, saline water can consist of a mixture of water and glycol. In principle, any refrigerant intended for refrigeration systems can be used.

The cooling system has ventilation openings or ventilation slots on the floor element and on the ceiling element, in the openly configured area. The cooled air leaves through the ventilation holes of the ceiling element and returns to the cooling installation through the ventilation holes of the floor element. The cooling system has flow channels located in the floor element, in the ceiling element and in the rear wall for air circulation. Through at least one fan the air found in the channels is caused to circulate so that the cooled air flows along the rear wall and the floor element, as well as the ceiling element, entering and returning to exit through the vents. In this way, the air flow achieves cooling of the walls of the cooling installation and cooling of the goods space.

Other advantages, characteristics, as well as design possibilities result from the following description of the figures of embodiment examples that should not be understood in a restrictive way.

In the drawings it is shown in the:

FIG. 1 a schematic representation of a refrigeration installation with three refrigeration zones;

Figure 2 a schematic section of a refrigeration installation and

Figure 3 another schematic section of a refrigeration installation with a closed shutter.

In the drawings, parts identified by the same reference numerals essentially correspond to each other, unless otherwise indicated. In addition, the description of components that are not essential for the understanding of the technical theory disclosed here is dispensed with.

With reference to Figures 1 to 3, a refrigeration installation 10 designed for the refrigeration of different products 92 is described below. Products 92 comprise, for example, dairy products, meat products or sausages, and / or fruits and vegetables.

The refrigeration installation 10 has a goods space 12 surrounded by two side walls 14 a rear wall 16, a roof element 18 and a floor element 20. The side walls 14, the rear wall 16, the roof element 18 and the floor element 20 is configured in a manner analogous to that of the refrigeration installations known from the state of the art. Consequently, these parts are configured, at least on their side facing the goods space 12, so that the goods space 12 can be cooled without any heat transfer from outside the refrigeration installation 10 to through the rear wall 16, the roof element 18, the floor element 20 and the side walls 14, or so that this is reduced. The cooling installation 10 has three cooling zones 30, 50 and 70. These cooling zones 30, 50 and 70 are schematically represented by means of the dotted line. The cooling installation 10 is designed in such a way that different cooling zones 30, 50 and 70 do not have to be separated by means of intermediate walls. Through the design of the cooling installation 10 it is possible to use the different cooling zones 30, 50 and 70 independently of each other and at different temperatures.

The first cooling installation 30 has at least one pump 34, a cooling unit 36 and a regulating device 42. Additionally, measuring devices 32 and 44 are provided. Via the measuring devices 32 and 44, the temperature can be recorded. and the refrigerant flow rate. The cooling unit 36 has at least one fan 40 and a plate heat exchanger 38. For cooling the cooling zone 30, a coolant is supplied to the cooling zone via a central coolant supply conduit 22. heat exchanger 38 with the aid of the pump 34. Through the heat exchanger 38 the heat of the goods space 12 of the refrigeration zone 30 is absorbed, the heated refrigerant being then supplied, through a refrigerant discharge conduit, to a central coolant discharge duct 24. The number of revolutions of the pump 34 is controlled by means of the regulating device 42. The number of revolutions of the fan 40 is also controlled by means of the regulating device 42. To this end, it is controlled Depending on the number of revolutions of the pump 34, the number of revolutions of the fan 40. The measuring devices 32 and 44 can also be connected to the control device 42. The data is also transmitted to the control device 42, for example , the coolant temperature in the forward and return flow, as well as the coolant flow rate. The regulation device 42 is configured to control the temperature in the cooling zone 30. In contrast to the representation of figure 1, a central control unit can also be provided coupled to the respective regulation devices 42, 62 and 82.

The coolant is supplied through the coolant supply conduit 22 at a predetermined flow temperature. Pump 34 regulates the flow of refrigerant as a function of a cooling demand. When the number of revolutions of the pump 34 is increased to increase the flow rate of coolant, the number of revolutions of the fan 40 is also increased through the regulating device 42. As a consequence there is a higher flow of air cooled in the goods space 12 and especially in the cooling zone 30. By means of the measuring device 44 the return temperature of the coolant is recorded. If the return temperature exceeds a certain measurement or a threshold value, the regulating device 42 activates the increase in the number of revolutions of the pump 34 and the increase in the number of revolutions of the fan 40. In comparison with the cooling devices known in In the state of the art, in which the number of revolutions of the fan is not increased, the number of revolutions of the pump 34 can be increased to a lesser extent in the cooling installation 10 described here. However, if the number of revolutions of the pump 34 is increased to the same extent as, for example, according to the state of the art, the increase of the number of revolutions of the fan 40 causes a stronger circulation of the cooled air, thus achieving faster cooling of products 92.

The plates of the heat exchanger 38 may include, for example, portions of the rear wall 16 or adjoining portions of the rear wall 16. Furthermore, the fan 40 is arranged so that the air carried through the fan 40 is cooled by means of heat exchanger 38.

The second cooling zone 50 has, analogously to the first cooling zone 30, at least one pump 54, a cooling unit 56 with a heat exchanger 58 and a fan 60, as well as a regulating device 62 and devices measurement 52, 54 and 66. The third cooling zone 70 has, similarly to the first cooling zone 30 and the second cooling zone 50, at least one pump 74, a cooling unit 76 with a heat exchanger 78 and a fan 80, as well as a regulating device 82. The third cooling zone 70 also has measuring devices 72, 84 and 86. The pumps 34, 54 and 74 are connected to the central and common coolant supply duct 22. The return ducts of the respective cooling zones 30, 50 and 70 are also connected to a central and common coolant discharge duct 24. The coolant supply duct 22 and the cond Refrigerant discharge duct 24 are connected to a cooling device, for example a heat pump. Through the heat pump, the coolant is heated to a specified flow temperature.

The design of the different cooling zones 30, 50 and 70 guarantees the possibility of achieving, independently of the other cooling zones 30, 50 and 70, a specific cooling for the respective cooling zone 30, 50 or 70. With this objective It is possible to independently control both the number of revolutions of the pumps 34, 54 and 74 through the regulating device 42, 62 and 82, as well as the number of revolutions of the fans 40, 60 and 80. In the embodiment represented by way of example in FIG. 1, an internal temperature of the products 92 placed in the cooling zone 30 of 2 degrees centigrade can be achieved, while in the second cooling zone 50 an internal temperature of the products can be set. 92 of 4 degrees centigrade and in the third cooling zone 70 an internal temperature of the products 92 of 3 degrees centigrade. Increasing the number of revolutions of the fans 40, 60 and 80 in the event of an increase in the number of revolutions of the pumps 34, 54 and 74 favors the cooling of the products 92 placed in the goods space 12, therefore the internal temperature of products 92 is reached more quickly. Therefore, per unit time the air flow through the products 92 is greater, thereby extracting a greater amount of heat from the products 92 and the products 92 being cooled. On the other hand, with lower flow rates of cooled air, the air heats up more before reaching the lower zone of the goods space 12. Therefore, the heat absorption capacity is lower. In addition, the amount of cooled air is also less, which takes more time to reach the desired internal temperature than in the case of a higher cooled air flow achieved through an increase in the number of revolutions of the fans 40, 60 and 80.

Figure 2 shows a schematic section of a cooling installation 10. In figure 2, the cooling installation 10 is represented with a view on the third cooling zone 70. The cooling installation 10 has two connections on the ceiling element 18 88 and 90. Connection 88 is connected to refrigerant supply conduit 22 and connection 90 to refrigerant discharge conduit 24. Arrows show direction of refrigerant flow. On the rear wall 16 or within the rear wall arrangement, the pump 74 and the cooling unit 76 shown schematically are arranged. The regulating device 82 is located on the outer face of the rear wall 16. However, it is noted that the representation shown in figure 2 is schematic and showing only one possibility of realization among a plurality of variants. Thus, the regulating device 82 can also be arranged, for example, inside the cooling installation 10 in different positions. By means of the broken lines the control lines between the regulating device 82 and the pump 74 as well as the refrigeration unit 76 are illustrated. The supply and return lines of the refrigerant are also schematically indicated. The measuring devices 72, 84 and 86 are not shown in figure 2. The arrangement of the cooling unit 76 may also be different from that shown in figure 2. Only the arrangement of the pump 74 in front of the cooling unit 76 in the direction of the coolant flow is necessary for the cooling installation 10 so that, through the pump 74, the supply of coolant to the heat exchanger 78 can be controlled or regulated as a function of a cooling demand. The areas of the rear wall arrangement facing the merchandise space 12 can be coupled to the heat exchanger 78 or form part of the heat exchanger 78. The fan 80 is arranged so that air passes through the heat exchanger 78 and cool down. The direction of the air flow is represented in part schematically by means of the arrow 96. For this, the cooling installation 10 has cooling channels extending into the cooling installation 10. The cooling installation 10 also has in the ceiling element 18 an outlet hole or outlet area for the cooled air. Through this upper outlet zone, the cooled air flows, as shown by arrow 96, downwards, being drawn through an air inlet hole in the floor element 20 through the fan 80. The fan 80 makes passing the heated air through the heat exchanger 78 and back to the roof element 18, the cooled air flowing along the rear wall, thereby cooling the rear wall. There is a circulation of the cooling space 12 in the direction indicated by the arrow 96. If an increase in the demand for cooling of the products 92 placed in the goods space 12 is detected, the number of revolutions of the pump 74 is increased so that a higher flow rate of refrigerant is supplied to the heat exchanger 78. Furthermore, through the regulating device 82 the number of revolutions of the fan 80 is increased, thereby obtaining a higher flow rate of cooled air. The cooled air does not heat up as much with a stronger flow rate, so the heat can still be absorbed even in a lower area of the goods space 12.

In addition to air circulation through the goods space 12 and the lower element 20, the arrangement of the rear wall and the roof element 18, the arrangement of the rear wall can have on the side facing the goods space 12 opening slots, so that cooled air can also enter the goods compartment 12 through them. The roof element 18, the floor element 20 and the side walls can also have openings through which air can enter and exit.

The refrigeration system 10 also has a closing device 94. The closing device 94 serves to close the goods space 12, so that no heat exchange takes place between the air in the goods space 12 and the products 92 located in the goods space 12 and the environment of the refrigeration installation 10, or that this exchange is very low.

Figure 3 shows a schematic section of the refrigeration installation 10 with a closed merchandise space 12. For this, a shutter 98 has been lowered, which closes the merchandise space 12. The shutter 98 can be insulating to reduce or avoid exchange of heat between the goods space 12 and the environment of the refrigeration installation 10. Since only a low input of heat occurs into the goods space 12 through the environment of the refrigeration installation 10, the demand for cooling also is reduced. Consequently, the number of revolutions of the pump 74 is reduced and, at the same time, the number of revolutions of the fan 78 is reduced. The number of revolutions of the fan 80 is always adapted to the flow rate of the pump 74. If the flow rate of pump 74 as well as pumps 34 and 54 is high, fans 40, 60 and 80 are properly activated. An increase in flow through fans 40, 60 and 80 results in faster cooling of the merchandise space 12 and especially of the products 92 placed in the goods space 12. If the fans 40, 60 and 80 carry a greater flow of air cooled through the goods space 12, a smaller reduction in the advance temperature of the refrigerant to achieve higher cooling capacity, for example when introducing new products 92. In conventional state-of-the-art refrigeration devices, the flow temperature always has to be greatly reduced. a when new products 92 are introduced. On the contrary, the cooling devices 10 and the operating procedures of the cooling devices 10 described herein allow the cooling of new products 92 introduced into the merchandise space 12 even with a minor reduction of the coolant advance temperature. Additionally or alternatively, in the event of a reduction in the advance temperature of the coolant, the internal temperature of the products 92 can also be lowered more rapidly than in prior art refrigeration installations. Therefore, the reduction of the flow temperature of the coolant requires a shorter period of time than in the refrigeration devices according to the state of the art. As a consequence, the operating cost of the cooling installation 10 is reduced. Furthermore, the components, for example, the pumps 24, 54 and 74, can have a lower flow rate if the fans 40, 60 and 80 are driven a higher flow of cooled air through the goods space 12.

List of references

10 Cooling installation

12 Goods space

Side wall

Rear wall

Ceiling element

Soil element

Refrigerant supply line Refrigerant discharge line Cooling zone

Measuring device

Bomb

Refrigeration unit Heat exchanger

Ventilator

Regulating device Measuring device

Cooling zone

Measuring device

Bomb

Refrigeration unit Heat exchanger

Ventilator

Regulating device Measuring device

Measuring device

Cooling zone

Measuring device

Bomb

Refrigeration unit Heat exchanger

Ventilator

Regulating device Measuring device

Measuring device

Connection

Connection

Product

Closing device

Arrow

Blind

Arrow

Claims (7)

1. Refrigeration installation with side walls (14) surrounding a space for goods (12) to be cooled, a rear wall (16) as well as a ceiling element (18) and a floor element (20), the space being (12) accessible, at least temporarily, through the side opposite the rear wall (16), which has at least one refrigerant supply conduit (22) and a refrigerant discharge conduit (24) and heat exchangers. heat (38; 58; 78) connected to the refrigerant supply conduit (22) and the refrigerant discharge conduit (24), refrigerant transport devices and fans (40; 60; 80) for circulating cooled air to through the heat exchangers (38; 58; 78), - the cooling installation (10) having at least two cooling zones (30; 50; 70) arranged side by side, each cooling zone (30; 50; 70) being assigned at least one device for transporting refrigerant, a heat exchanger (38; 58; 78) and a fan (40; 60; 80), characterized by what - the flow of refrigerant can be regulated through the refrigerant transport devices and the flow of air circulated by the fans (40; 60; 80) can be regulated through at least one regulation device (42; 62; 82), - the air flow circulated by the fans (40; 60; 80) can be regulated according to the refrigerant flow, and because - the refrigerant transport devices are speed controlled pumps (34; 54; 74). A cooling installation according to claim 1, in which the fans (40; 60; 80) are speed-controlled fans. Refrigeration installation according to claim 1 or 2, which has a closing element (94) configured to close the side opposite the rear wall (16). 4. Operating method of a refrigeration installation that has side walls (14) that surround a space for goods (12) to be cooled, a rear wall (16) as well as a ceiling element (18) and a floor element ( 20), the merchandise space (12) being accessible, at least temporarily, through the side opposite the rear wall (16), the refrigeration installation (10) having at least one refrigerant supply conduit (22) and a refrigerant discharge conduit (24) and heat exchangers (38; 58; 78) connected to the refrigerant supply conduit (22) and the refrigerant discharge conduit (24), refrigerant transport devices and fans (40 ; 60; 80) for the circulation of cooled air through the heat exchangers (38; 58; 78), - the cooling installation (10) having at least two cooling zones (30; 50; 70) arranged side by side, each cooling zone (30; 50; 70) being assigned at least one regulating device ( 42; 62; 82), a refrigerant transport device, a heat exchanger (38; 58; 78) and a fan (40; 60; 80), it being possible to control the refrigerant transport devices and fans (40 ; 60; 80) of the adjacent cooling zones (30; 50; 70) independently of each other within the cooling installation (10), characterized by what - the refrigerant flow can be regulated through the refrigerant supply elements and the quantity of air circulated by the fans (40; 60; 80) can be regulated by the regulation devices (42; 62; 82) , - the flow of refrigerant supplied through the refrigerant transport devices is regulated according to the cooling demand for the goods space (12), - the flow of refrigerant circulated by the fans (40; 60; 80) is regulated as a function of the flow of the refrigerant and because - the refrigerant transport devices are speed-controlled pumps (34; 54; 74), the flow of refrigerant being regulated by changing the number of revolutions of the pumps (34; 54; 74). A method according to claim 4, wherein the fans (40; 60; 80) are speed controlled fans and the flow rate of cooled air is regulated by changing the speed of the fans (40; 60; 80). Method according to claim 4 or 5, in which the cooling installation (10) has a closing device (94) configured to close the side opposite the rear wall (16), controlling the flow of refrigerant and air cooled as a function of an opening or closing position of the closing device (94). Method according to one of claims 4 to 6, in which the flow rate of cooled air increases as the flow rate of refrigerant increases.