EP2226577A1 - Transportable cooling device - Google Patents

Abstract

The device (1) has a suction opening, and a cooling circuit comprising a compressor and an evaporator (17). A fan (32) is provided with a suction side and a pressure side. A cooling source is arranged between the pressure side of the fan and an exhaust connection piece (13). A filter i.e. sand filter, is arranged in front of the suction side. The cooling source is formed directly by the evaporator, and the fan and the cooling circuit are arranged in a container (2), where an inner area of the container is divided into an air-conditioning part and a cooling part.

Description

The invention relates to a transportable cooling device with a suction opening, a blow-out, a cooling circuit consisting of an evaporator, a compressor and a condenser. Furthermore, a fan is provided with a suction side directed towards the intake opening and a pressure side directed towards the exhaust nozzle, wherein a cooling source is arranged between the pressure side of the fan and exhaust nozzle.

It is a cooling system of the Fa. Carrier Rental Systems Germany GmbH known, which is designed as a portable cooling device. This consists of an air handling device and a liquid cooler. Both components are arranged in containers and thus formed movable.

In the liquid cooler, the classical units such as condenser, compressor and evaporator are provided. The evaporator is in operative connection with a secondary coolant circuit. In this case, the refrigerant of the secondary circuit is cooled by the evaporator via a heat exchanger and transported by a pump to the air handling device. There, via a further heat exchanger, the cooling of the pressed by fans through the heat exchanger hot air.

Although this system offers the advantage that the liquid cooler can be placed separately to the rooms to be cooled, it should be noted that a separate pump set is required here, which on the one hand requires a transport, both in terms of space and in terms of weight, having. In addition, this increases the susceptibility to interference. This and the size of the required two system components limit the areas of use of such a portable cooling device. Thus, use of such a system in robust crisis operations is limited. In addition, the cooled air is always generated entirely from sucked fresh air, resulting in a high energy consumption.

It is therefore an object of the invention to provide a portable cooling device whose manufacturing and material costs are reduced, which requires a lower transport cost and also works under difficult environmental conditions with high reliability and has a high energy efficiency.

This object is achieved according to the invention in that the cooling source is formed directly through the evaporator and that the fan and the cooling circuit are arranged in one and the same container. This eliminates the one hand, a secondary cooling circuit and the associated parts, such as additional pump and wiring harness. This reduces the manufacturing and material costs. Furthermore, the efficiency is improved by the elimination of the secondary cooling circuit and thus improves the energy and fuel efficiency. On the other hand, the entire device can be handled all at once. The container is set up on site and can be put into operation immediately after connection to the room to be cooled without further installation effort. Usually, the device can be provided with a 20-ft standard container, which itself also has the necessary receiving means for transport and lifting equipment.

In one embodiment of the invention it is provided that the interior of the container is divided into an air treatment part and an air side of this separate cooling part. In this case, in the air treatment part, a first part of the cooling circuit with the evaporator and together with the Fan and the cooling part provided with a ventilation opening. In the cooling part, a second part of the cooling circuit, which contains the compressor and the condenser, arranged, wherein the second part of the cooling circuit is provided with a cooling fan, in the air flow of the condenser is located. By this division, it is possible, the air currents, namely the air flow of the air to be cooled and the air flow which serves to eliminate the waste heat to lead in a simple manner separated from each other. Special piping inside the container to guide the air currents are thus avoided and the wall surfaces of the container are optimally used for the arrangement of the required openings.

In a further embodiment of the invention, a further division is provided, namely in such a way that in the air treatment part, a fan room is divided. This fan room is connected via a dust filter with the rest of the air conditioning part. In the fan room, the evaporator and the fan are arranged and connected to the air outlet. In the remaining air treatment part, the suction port is arranged. Thus, the fan sucks the air from the fan room, which then flows through the dust filter from the rest of the air conditioning part of the suction port, which may otherwise constitute a fresh air opening or a recirculation opening or a combination of both, and is filtered by this. The invention thus enables the use of circulating air, i. of already cooled air. By this construction according to the invention and an intelligent control, it is possible to realize an economical and energy saving operation.

In one embodiment of the invention, a filter is arranged in front of the suction side of the fan and the fan is provided with a suction force overcoming the flow resistance of the filter. This will make it possible for the Arrangement of the filter can be done with simple means. Namely, if the filter is added, only the capacity of the fan will reduce without this even takes damage. Additional resources that require a pressure control to protect the performance of the fan are unnecessary.

For optimal filtering of the cooling air is provided in one embodiment of the invention that the filter has a dust filter.

In addition, it may be useful, especially when used in desert areas, to keep coarse particles away from the dust filter so as not to burden it unnecessarily. For this purpose, it is provided in one embodiment of the invention that the filter has a sand filter.

Appropriately, the dust filter is arranged downstream of the sand filter in the flow direction.

The monitoring of the condition of the filter is facilitated by the use of a fan with a larger suction power. Thus, in one embodiment of the invention between the filter and the suction side of the fan, a pressure sensor is arranged, which is connected to a pressure measuring device and above with a pressure indicator device.

In a further embodiment, it is provided that the ventilation opening is provided with a sand filter. The ventilation openings serve primarily to aerate the condenser. In this case, it is not absolutely necessary to keep the cooling air for the condenser dust-free. However, keeping away from sand, especially for use in desert areas, makes great sense to prevent sanding of the interior.

In order to keep the maintenance effort as low as possible, it is expedient that the sand filter self-cleaning is trained. This can be realized by providing the filter with baffles against which the sand particles entrained in the air flow bounce and fall down due to the loss of speed.

This can advantageously be realized by providing the ventilation opening with a sand filter designed as a weather protection grid.

To increase or vary the cooling capacity is provided in a further variant of the embodiment of the invention to arrange a second cooling circuit, the evaporator is arranged as a second cooling source between the pressure side of the fan and Ausblasstutzen. Depending on requirements, then a cooling circuit, the other cooling circuit or both can be switched on. It also makes it possible to create a redundancy, so that always one cooling circuit is ready, even if the other fails.

For this purpose, it is particularly expedient if the cooling circuit and the second cooling circuit can be controlled independently.

In another embodiment, it is provided that a second cooling circuit is arranged, the evaporator is arranged as a cooling source between the pressure side of a second fan and its associated Ausblasstutzen in the air flow of the second fan of the second cooling circuit. Thus, two separate cooling air flows are realized with which either the cooling capacity and / or the reliability can be increased.

Again, it is useful if the cooling circuit and the second cooling circuit and / or the fan and the second fan, are independently controllable.

The invention will be explained below with reference to an exemplary embodiment.

In the accompanying drawings shows

Fig. 1

a side view of a cooling device according to the invention,

Fig. 2

an opposite side view of the cooling device according to the invention,

Fig. 3

a front view of the cooling device according to the invention with door,

Fig. 4

a rear view of the cooling device according to the invention with the rear wall and intake grille,

Fig. 5

a schematic diagram of the cooling device according to the invention,

Fig. 6

a sectional view with a plan view of an upper level of the cooling device according to the invention,

Fig. 7

a sectional view with a plan view of a lower level of the cooling device according to the invention,

Fig. 8

a sectional view of the cooling device according to the invention with a view towards the front and

Fig. 9

a schematic diagram of the cooling device according to the invention with a common use of the condenser for both cooling circuits.

As in Fig. 1 shown, the transportable cooling device 1 on a container 2. This container is provided with a service door 3 through which persons have easy access to the interior of the container 2 to there Be able to carry out maintenance and adjustment measures.

The container 2 is divided into an air treatment part 4 and a cooling part 5. The division runs in the example on the left of the service door 3

The of the in Fig. 3 illustrated front 6 seen right side of the container 2 is provided with a fresh air opening 7, which is closed with a shutter 8. The blinds 8 act as a self-cleaning sand filter.

The cooling part 5 is provided with ventilation openings 9, which allow entry of fresh air into the cooling part 5.

The left side, the in Fig. 2 is shown, also has a ventilation opening 9, as well as in Fig. 4 shown back 10. All ventilation openings 9 are provided with weather protection grates, which are also designed as a self-cleaning sand filter 11.

In the area of the air treatment part 4 on the left side air intake 12 are provided, with which it is possible to connect the air treatment part 4 via corresponding pipes with the space to be ventilated. This makes it possible to supply the air treatment part 4 at least partially with circulating air. Also in front of these air intake 12 blinds 8 are provided. These can also act as self-cleaning sand filters again.

The fresh air / recirculated air ratio is functionally adjustable between 10 and 100%.

Furthermore, air outlet 13 are also provided on this page. At these is cooled supply air from the air treatment part 4, which can then be supplied via appropriate piping to the room to be cooled.

As in Fig. 3 shown, is the container with a door 14 provided, which is a standardized container door and by means of which all major parts can be spent in the container 2 and which can serve as a mounting hole at least during construction. In addition, behind the door 14, a wear and service parts warehouse can be arranged, which can be easily accessed when opening the door 14.

In Fig. 4 On the one hand, the back is shown in the manner already described. On the other hand, it can be seen in the sectional view AA, the structure and the arrangement of a sand filter 11.

Fig. 5 shows the basic functional structure of the cooling device according to the invention. In this case, a first cooling circuit 15 and a second cooling circuit 16 are provided, which are both independently controllable. Both cooling circuits have the same structure. Each of these cooling circuits 15, 16 each includes an evaporator 17.

Therein, a coolant that is provided by means of a respective compressor 18, via a respective condenser 19, a collector 20 and a subsequent subcooler 21, a filter drier 22, a sight glass 23, a solenoid valve 24 and an expansion valve 25 is provided.

Each of these cooling circuits 15, 16 is arranged with a first part 26 in the air treatment part 4 and with a second part 27 in the cooling part 5.

Fig. 6 shows an upper level 28 and Fig. 7 a lower level 29 of the transportable cooling device 1 wherein the position of the levels 28 and 29 from Fig. 8 can be seen.

For the removal of heat from the condensers 19 and the subcoolers 21 cooling fans 30 are provided in the vertical air flow, the condenser 19 and the subcooler 21 lie. For the exhaust air of the cooling fan 30, a ceiling cutout 31 is provided in the container 2, through the warm air can enter the outside. The cooling fans 30 suck their cooling air through the ventilation openings 9. At the sand filters 11 thereby coarser particles, which are entrained by the suction, hit down and then fall down, whereby these sand filters 11 then have a self-cleaning effect. Thus, the use in places where to cool, but also a high coarse particle concentration is encountered, such as in desert areas, allows. Here downstream dust filter are not necessarily required in the air flow and are omitted to improve the efficiency.

Separated from the air flow in the cooling part 5, the air flow in the air treatment part 4 is organized. Each evaporator 17 is associated with a fan 32. But it is also possible that the evaporator 17 of both cooling circuits 15 and 16 are flowed through by one and the same fan, as is not shown in detail. It would be possible to switch the cooling capacity with the same air flow in two stages. In the illustrated example, however, two air streams are shown via two fans 32, each with separate cooling circuits 15 and 16.

As in Fig. 8 represented, in the container 2, a fan space 33 is realized by a false ceiling 34. From this fan room 33, the fans 32 suck in the air to be cooled.

The sand filters, i. the blinds 8, which are in the air flow of the fresh air and the circulating air, dust filter 35 downstream of the air flow. These are designed as fine dust filters, for example in the dust class EU 3 or EU 4.

As mentioned above, the blinds 8 as a sand filter be educated. However, it is also possible to arrange direct sand filters 37 in front of the dust filters 35, as shown in FIG Fig. 6 is shown.

The dust filter 35 are arranged on the false ceiling 34 in a filter chamber 36 through which the air to be sucked must pass. The fans 32 are provided with a suction power, which allows the upstream of these dust filter 35. On the one hand, this has the advantage that the negative pressure in the fan chamber 33 can be measured via pressure sensors (not shown). If the negative pressure drops too much, this can be regarded as an indicator that the dust filters 35 are added and require replacement or cleaning. On the other hand, a clogging of the dust filter 35 thus at most leads to a reduction of the air power, but not to a damage of the fan 32nd

The air to be cooled can be provided further via two ways. On the one hand, the air can be sucked in as fresh air via the fresh air opening 7. To avoid the ingress of dust here is a pre-filter, consisting of a sand filter, which is realized by the blind 8, and / or a sand filter 37 and a dust filter 35, is provided. In addition, the amount of fresh air entering can be adjusted by the position of the blind 8. Thus, the ratio fresh air / circulating air is set immediately. The flow resistances are matched to one another in such a way that 100% fresh air is driven in front of the fresh air opening 7 when the blind 8 is fully open. If this shutter 8 is closed, 90% circulating air and 10% fresh air is driven. The 10% are required to ensure an oxygen content of the cooled air and this is set by an incomplete tightness of the blind 8 in front of the fresh air opening 7.

On the other hand, the air can also be sucked in as circulating air.

For this purpose, the air intake 12 are connected with pipes to the room to be cooled, so that from this room, the air to be cooled is sucked in as circulating air. Of course, a mixed operation of fresh air and circulating air is possible.

In Fig. 5 Two separate cooling circuits are shown. Physically, this block diagram can be realized in that two fan spaces 33 are provided. In one of the fan rooms 33 (in Fig. 6 and Fig. 7 the left) is a first part 26, preferably a first evaporator 17, which is part 38 of the first cooling circuit 15, with associated fan 32 and filters 35 and 37 arranged. In the other of the fan rooms 33 (in Fig. 6 and Fig. 7 the right) is a first part 26, preferably a first evaporator 17, which is part 39 of the second cooling circuit 16, with associated fan 32 and filters 35 and 37 arranged.

In the cooling part 5, two compressors 18 are arranged. The in Fig. 7 illustrated left compressor 18 is part 38 of the first cooling circuit 15 and the right-hand compressor 18 is part 39 of the second cooling circuit 16. These then the cooling fan 30 can be assigned in groups.

At the in Fig. 9 illustrated schematic diagram of the two cooling circuits 15 and 16 Fig. 5 not completely separated. Rather, only a first cooling circuit part 40 and a second cooling circuit part 41 are separated from each other. Both cooling circuit parts 40 and 41 include an evaporator 17, which is associated with a fan 32, an expansion valve 25, a solenoid valves 24 and a sight glass 23. The remaining parts of the cooling circuit, in particular or the condenser 19 with the associated cooling fans 30 and the or the compressors 18 are shared by both cooling circuit parts 40 and 41.

Physically, the parts of the schematic diagram according to FIG. 9 in a similar way to Fig. 5 described, that is, the first cooling circuit part 40 is arranged as a component 38 and the second cooling circuit part as a component 39 each in one of the two fan chambers 33. The compressors 18 are arranged in the same way, interconnect only together, so that you do not assign them as part 38 or 39 of the cooling circuits.

Even if only one of the refrigerating cycle parts 40 and 41 is used for producing cooled air, it has been found that the energy efficiency improves even though the switching frequency may increase.

Such a cooling device 1 thus has five separate effect chambers, namely the filter chamber 36 for the first cooling circuit 15 or for the first cooling circuit part 40, the filter chamber 36 for the second cooling circuit 16 or for the second cooling circuit part 41, the fan space 33 for the first cooling circuit 15th or for the first cooling circuit part 40, the fan room 33 for the second cooling circuit 16 or for the second cooling circuit part 41, and the space of the cooling part 5.

LIST OF REFERENCE NUMBERS

1

transportable cooling device

2

Container

3

service door

4

Air treatment part

5

refrigerator

6

front

7

Fresh air opening

8th

louvre

9

ventilation opening

10

back

11

sand filter

12

air intake

13

air outlet

14

door

15

first cooling circuit

16

second cooling circuit

17

Evaporator

18

compressor

19

condenser

20

collector

21

subcooler

22

filter dryer

23

sight glass

24

magnetic valve

25

expansion valve

26

first part of the cooling circuit

27

second part of the cooling circuit

28

upper level

29

lower level

30

cooling fan

31

ceiling cut

32

Fan

33

fan room

34

false ceiling

35

dust filter

36

filter chamber

37

sand filter

38

Part of the first part of the cooling circuit

39

Part of the second part of the cooling circuit

40

first cooling circuit part

41

second cooling circuit part

Claims (15)

Transportable cooling device having a suction opening (12), a discharge nozzle (13), a cooling circuit (15; 16) consisting of an evaporator (17), a compressor (18) and a condenser (19), and a fan (32) having a to the suction port (7; 12) directed suction side and to the Ausblasstutzen (13) directed pressure side, wherein a cooling source between the pressure side of the fan and Ausblasstutzen is arranged, characterized in that the cooling source is formed directly through the evaporator (17) and that the fan (32) and the cooling circuit (15; 16) are arranged in one and the same container (2). Transportable cooling device according to claim 1,
characterized in that the interior of the container (2) is divided into an air treatment part (4) and a cooling part (5) separated therefrom by the air, wherein in the air treatment part (4) a first part (26) of the cooling circuit (15; 16) with the evaporator (17) and together with the fan (32) is arranged, the cooling part (5) is provided with a ventilation opening (9) and in the cooling part (5) has a second part (27) of the cooling circuit (15; 16) containing the compressor (18) and the condenser (19) is arranged, wherein the second part (27) of the cooling circuit (15; 16) is provided with a cooling fan (30) in the air flow of the condenser (19) , Transportable cooling device according to claim 2,
characterized in that in the air treatment part (4) a fan chamber (33) is divided, which is connected via a dust filter with the rest of the air conditioning part (4) and in that in the fan chamber (33) of the evaporator (17) and the fan (32) and arranged with the air outlet nozzle (13 ) are connected and in the remaining air treatment part (4), the suction port (7; 12) is arranged. Transportable cooling device according to one of claims 1 to 3, characterized in that in front of the suction side of the fan (32) a filter (8; 35; 37) is arranged and the fan (32) with a flow resistance of the filter (8; 37) overcoming suction power is provided. Transportable cooling device according to claim 4,
characterized in that the filter (8; 35; 37) comprises a dust filter (35; 37). Transportable cooling device according to claim 4 or 5,
characterized in that the filter (8; 35; 37) comprises a sand filter (8) Transportable cooling device according to claim 6,
characterized in that the dust filter (35, 37) is arranged in the flow direction behind the sand filter (8). Transportable cooling device according to one of claims 1 to 7, characterized in that between the filter (8; 35; 37) and the suction side of the fan (32), a pressure sensor is arranged, which is connected to a pressure measuring device and above with a pressure indicator device. Transportable cooling device according to one of claims 2 to 8, characterized in that the ventilation opening (9) provided with a sand filter (11) is. Transportable cooling device according to claim 9,
characterized in that the sand filter (11) is self-cleaning. Transportable cooling device according to claim 9 or 10,
characterized in that the ventilation opening (9) is provided with a designed as a weather protection grit sand filter (11). Transportable cooling device according to one of claims 1 to 11, characterized in that a second cooling circuit (16) is arranged, the evaporator (17) as a second cooling source between the pressure side of a second fan (32) and its associated Ausblasstutzen (13) is arranged , Transportable cooling device according to claim 12,
characterized in that the cooling circuit (15) and the second cooling circuit (16) are independently controllable. Transportable cooling device according to one of claims 1 to 11, characterized in that a second cooling circuit (16) is arranged, the evaporator (17) as a cooling source between the pressure side of a second fan (32) and its associated Ausblasstutzen (13) in the air flow of the second fan (32) of the second cooling circuit (16) is arranged. Transportable cooling device according to claim 14,
characterized in that the cooling circuit (15) and the second cooling circuit (16) and / or the fan (32) and the second fan, are independently controllable.

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