Cooling arrangement for cooling a machine, a method therefor

Abstract

The invention relates to a cooling arrangement (1) for cooling a machine (M1, M2, M3) in a machine hall (2), comprising a first cooling circuit (11), which is designed to cool at least one region of the machine (M1, M2, M3), a second cooling circuit (12), which is connected to a machine cooler (3) in order to emit heat into the machine hall (2), wherein a first heat exchanger (4) is arranged between the first cooling circuit (11) and the second cooling circuit (12) in order to transfer heat between the first and second cooling circuit (11, 12), and a second heat exchanger (5), through which the first cooling circuit (11) is able to flow and which has a first connection (51) and a second connection (52), designed for connecting to a third cooling circuit (13), which is connected to an environmental cooler (6) outside the machine hall (2).

Description

[0001] Cooling arrangement for cooling a machine and method therefor

[0002] Description

[0003] The present invention relates to a cooling arrangement for cooling a machine, in particular a machine tool, in a machine hall, a machine with such a cooling arrangement, a machine arrangement in a machine hall with a plurality of machines and a method for operating a machine with a cooling arrangement.

[0004] For machine tools that perform high-precision machining of workpieces, there is a risk that undesirable inaccuracies may occur during machining due to temperature fluctuations in the work area and / or in the machine shop in which the machine tool is located. Therefore, such machines are installed in machine shops that have complex heating and air conditioning systems to maintain a constant temperature in the shop, and particularly in the area of ​​the machine tool. It is also known to equip individual machine tools with dedicated cooling systems that can dissipate the heat generated during machining. However, this entails considerable expense, which increases the cost of the machine tools and / or the production of high-precision workpieces.

[0005] It is therefore an object of the present invention to provide a cooling arrangement of a machine in a machine hall, a machine with such a cooling arrangement, a machine arrangement in a machine hall with a plurality of machines and a method for operating a machine, which enables precise temperature control of the machine with a simple structure and simple, cost-effective implementation.

[0006] This object is achieved by a cooling arrangement having the features of claim 1, a machine having the features of claim 9, a machine arrangement having the features of claim 10, and a method having the features of claim 11. The subclaims each show preferred embodiments of the invention.

[0007] The cooling arrangement according to the invention for cooling a machine, in particular a machine tool, in a machine hall comprises a first cooling circuit and a second cooling circuit. The first cooling circuit is designed to cool at least one region of the machine, for example a work area, a main spindle, drive motors, or a tool magazine. The second cooling circuit is connected to a machine cooler, which dissipates heat into the machine hall. The machine cooler can be located next to the machine or integrated into the machine housing. A first heat exchanger is arranged between the first cooling circuit and the second cooling circuit in order to transfer heat between the first and second cooling circuits. The heat is preferably transferred from the first cooling circuit to the second cooling circuit.The cooling arrangement further comprises a second heat exchanger through which the first cooling circuit can flow and which has a first and second connection. The first and second connection are configured to be connected to a third cooling circuit, which is connected to an ambient cooler outside the machine hall.

[0008] This makes it possible for heat, which is dissipated from the machine via the first cooling circuit, for example, to be either dissipated via the first heat exchanger and second cooling circuit to a machine cooler or, alternatively, to be dissipated via the second heat exchanger and a third cooling circuit to an environment outside the machine hall. This makes it possible for the heat dissipated by the machine to be used, for example, to heat the machine hall (operating mode 1). Furthermore, by dissipating the machine's heat via the first and third cooling circuits, the temperature in the machine hall can be kept as constant as possible, since the heat generated by the machine can be dissipated to the environment via the third cooling circuit (operating mode 2).This means that heat released by the machine to a machine cooler in the machine hall does not have to be dissipated via an additional air conditioning system in the machine hall, which would lead to significantly increased energy consumption.

[0009] The machine cooler is preferably a compressor cooler or a compressor cooler.

[0010] Thus, the cooling arrangement can be operated in two modes: a first mode in which the heat from the machine is dissipated into the machine hall to heat the machine hall, and a second mode in which the heat is dissipated outside the machine hall. Preferably, the first and second heat exchangers are arranged in series in the first cooling circuit, and the first cooling circuit flows through them one after the other in this order. This allows for a cooling arrangement with reduced control complexity.

[0011] Alternatively, the cooling arrangement comprises a 2 / 3-way valve and a branch line that leads the first cooling circuit to the second heat exchanger. Using the 2 / 3-way valve, the first cooling circuit can be switched so that the first cooling circuit runs through the first heat exchanger or the second heat exchanger in the branch line. This allows for easy switching between the two operating modes of the cooling arrangement by switching the 2 / 3-way valve. Thus, the two heat exchangers are connected in parallel and can only be flowed through individually.

[0012] Further preferably, the third cooling circuit connects the second heat exchanger to the ambient cooler outside the machine hall. The ambient cooler is particularly preferably located in an external environment (environment), to which heat can be released as needed.

[0013] Particularly preferably, the cooling arrangement further comprises a temperature sensor in the machine hall and a control unit. The control unit is configured to switch the 2 / 3-way valve depending on a temperature in the machine hall determined by the temperature sensor and / or to switch the machine cooler and / or the ambient cooler on and off depending on the temperature determined by the temperature sensor.

[0014] According to a further preferred embodiment of the invention, an additional cooler that can be switched on and off is arranged in the third cooling circuit, which is designed to cool the air in the machine hall. The additional cooler can thus extract heat from the machine hall and transfer it to an area outside the machine hall via the third cooling circuit and the ambient cooler.

[0015] Preferably, the first and second heat exchangers are each a plate heat exchanger.

[0016] Preferably, the first and second heat exchangers are arranged in the first cooling circuit in the return line from the machine or alternatively arranged in the flow line of the first cooling circuit to the machine.

[0017] Further preferably, the control unit is configured to switch the machine cooler and / or the ambient cooler on and off after a predetermined time interval. This prevents the machine cooler and / or ambient cooler from being switched on and off too frequently, which could cause damage if the cooler is designed as a compressor cooler with refrigerant.

[0018] Furthermore, the present invention relates to a machine, in particular a machine tool, with a cooling arrangement according to the invention. The machine is preferably a machine tool for high-precision machining.

[0019] Furthermore, the invention relates to a machine arrangement in a machine hall with a plurality of machines according to the invention.

[0020] Furthermore, the present invention relates to a method for operating a machine, in particular a machine tool, with a cooling arrangement according to the invention, wherein heat generated by the machine is absorbed by a first cooling circuit and transferred to a second cooling circuit for heating the machine hall or to a third cooling circuit for discharging the heat absorbed from the first cooling circuit to an environment outside the machine hall. This allows the temperature of the machine hall in which the machine or a plurality of machines is located to be controlled.

[0021] In the method according to the invention, each machine preferably has its own cooling arrangement, whereby each cooling arrangement can preferably be controlled individually. This makes it possible for some cooling arrangements of the machines to heat the machine hall, while other cooling arrangements dissipate the heat absorbed by the machines to the environment outside the machine hall via the third cooling circuit.

[0022] Further preferably, the machine hall has a heating and / or air conditioning system, and the third cooling circuit of the cooling arrangement is part of this heating and / or air conditioning system. This allows the cooling arrangement to be integrated into an existing heating and / or air conditioning system and controlled in conjunction with the heating and / or air conditioning system.

[0023] Further preferably, the heating and / or air conditioning system is controlled depending on an operating mode of the cooling arrangement and in particular switched off when the machine hall can be temperature-controlled exclusively by the cooling arrangements of the machines and additional heating or cooling by the heating and / or air conditioning system is not required. Thus, by means of the present invention, a machine hall can be temperature-controlled with significantly reduced energy costs. If, preferably, a control unit has an input for determining a heating requirement of the machine hall, which is possible, for example, by means of the temperature sensor, very good temperature control of the machine hall can be enabled. If a temperature value falls below a predetermined threshold, for example, the cooling arrangement is switched to the first operating mode so that waste heat from the machine is dissipated to the machine hall via the machine cooler(s) (operating mode 1).If the threshold value is exceeded again, the cooling system is switched to the second operating mode so that the machine's waste heat is dissipated to an environment outside the machine hall via the third cooling circuit (operating mode 2). To avoid frequent switching between the two operating modes, switching can also be controlled via two slightly different threshold values, creating a hysteresis. In this case, the temperature for switching to the first operating mode is slightly lower than the temperature for switching to the second operating mode. This means that after switching to the first operating mode, it takes some time for the machine hall to warm up again so that the upper threshold value is reached and the cooling system can switch to the second operating mode.

[0024] Instead of a temperature sensor, the cooling system can also be controlled via a control system for a heating and / or air conditioning system for the machine hall. If the heating and / or air conditioning system for the machine hall signals a heating requirement, the cooling system can be switched to the first operating mode. If there is no heating requirement, the cooling system is switched to the second operating mode. Hysteresis can also be provided when connected to the heating and / or air conditioning system, which can be achieved, for example, by a time delay when switching between the first operating mode and the second operating mode.

[0025] Since the energy of the waste heat from individual machines, i.e. the waste heat output, is generally significantly lower than the power required to heat or cool the machine hall, the invention is particularly interesting when as many machines as possible in the machine hall are included in this process and are equipped with the cooling systems according to the invention. It is particularly advantageous that the machines and their cooling systems are often evenly distributed throughout the hall. If all of the machines in the machine hall are set up with their cooling systems for the process according to the invention, the waste heat is subsequently dissipated relatively evenly throughout the machine hall in the first operating mode. The energy-intensive conveying of tempered air, as is the case in the prior art, is eliminated because the waste heat from the machines is already well distributed throughout the hall by the machines' own cooling systems.

[0026] It should also be noted that in very large machine halls with a large number of machines, it is preferable that the switching between the first and second operating mode does not occur synchronously in one step for all machines. This would result in a relatively large heating output from the waste heat of the machines being suddenly switched on or off. In these cases, a separate central control system can be provided that is connected to all cooling systems of the machines in the machine hall and to the heating and / or air conditioning system and / or is connected to temperature sensors that record the temperature in the machine hall. The central control system then takes over the control of the individual cooling systems on the machines and switches them one by one successively between the two operating modes. In this way, heating output from the waste heat of the machines can be switched on and off gradually with relative ease.Special features of the machine hall in which the machines are installed can also be taken into account. For example, if the temperature in the machine hall along a window front is lower than in other parts of the hall due to heat loss through the windows, the central control system can ensure that the machines installed along such a window front are preferentially switched to the first operating mode. Furthermore, it can be advantageous for the central control system to ensure that the cooling systems on one side of the hall do not operate in the first operating mode while the machines on another side operate in the second operating mode, as this could lead to uneven temperature control in the hall.It is therefore advantageous if the central control system is designed so that during a mixed operation in which some cooling arrangements are operated in the first operating mode and other cooling arrangements in the second operating mode, the cooling arrangements running in the first and second operating modes are each evenly distributed over the machine hall.

[0027] Further preferably, several temperature sensors are distributed throughout the machine hall, which record the prevailing local hall temperature in various areas of the machine hall. A central controller can then specifically use the switching of the cooling systems between the first and second operating modes on the individual machines to compensate for temperature differences in the hall. In cooler areas of the machine hall, several cooling systems of the machines can then be operated in the first operating mode to heat this area. In warmer areas of the machine hall, the cooling systems of the machines can then be operated in the second operating mode to cool this area.

[0028] Furthermore, in the case of several machines, not all cooling arrangements of the individual machines are constructed in the same way, but the respective cooling arrangements are matched in their performance to the cooling requirements of the respective machine.

[0029] Embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the drawings: Fig. 1 is a schematic representation of a cooling arrangement with a machine in a machine hall according to a first preferred embodiment of the invention,

[0030] Fig. 2 is a schematic representation of the machine hall of Fig. 1 ,

[0031] Fig. 3 is a diagram showing a temperature T over time t in the machine hall of Fig. 1,

[0032] Fig. 4 is a schematic representation of a cooling arrangement with a machine in a machine hall according to a second preferred embodiment of the invention, and

[0033] Fig. 5 is a schematic representation of a cooling arrangement with a machine in a machine hall according to a third preferred embodiment of the invention.

[0034] A cooling arrangement 1 according to a first preferred embodiment of the invention is described in detail below with reference to Figures 1 to 3.

[0035] Fig. 2 schematically shows the structure of a machine hall 2, in which several machines M1, M2, and M3 are shown. As an example, Fig. 1 shows the structure of a cooling arrangement for machine M1.

[0036] As can be seen from Fig. 1, the machine M1 is a machine tool with a spindle 16 for ultra-fine machining of workpieces. This generates heat, which is dissipated by means of the cooling arrangement 1 according to the invention and the method according to the invention.

[0037] As can be seen from Fig. 1, the cooling arrangement 1 comprises a first cooling circuit 11 which is designed to cool an area of ​​the machine near the spindle 16.

[0038] The first cooling circuit 11 comprises a tank 21 filled with coolant 24, in which a pump 22 for conveying the coolant 24 is arranged. The pump 22 is driven by a drive 23. The first cooling circuit 11 comprises an inlet 11a, which leads from the pump 22 into the machine M1, and a return 11b, which leads away from the machine M1. A 2 / 3-way valve 7 is arranged further along the first cooling circuit. Starting from the 2 / 3-way valve 7, the return 11b leads to a first heat exchanger 4, and a branch line 11c leads to a second heat exchanger 5. From the first heat exchanger 4 or the second heat exchanger 5, the first cooling circuit 11 returns to the tank 21. The cooling arrangement 1 further comprises a second cooling circuit 12, which is connected to a machine cooler 3. The machine cooler 3 outside the machine M1 is designed to release heat into the machine hall 2.

[0039] As can be seen from Fig. 1, the second cooling circuit 12 is guided through the first heat exchanger 4 such that the first heat exchanger 4 transfers heat, which was released from the machine M1 into the first cooling circuit 11, to the second cooling circuit 12.

[0040] The second heat exchanger, through which the first cooling circuit 11 flows when the 2 / 3-way valve 7 is in the appropriate position, has a first connection 51 and a second connection 52, which are configured for connection to a third cooling circuit 13. As can be seen from Fig. 12, the third cooling circuit 13 is connected to an ambient cooler 6 outside the machine hall 2. The ambient cooler 6 can dissipate heat to an environment 8.

[0041] Thus, when the coolant in the first cooling circuit 11 flows into the branch line 11c with the corresponding position of the 2 / 3-way valve 7, heat is transferred in the second heat exchanger 5 from the first cooling circuit 11 to the third cooling circuit 13.

[0042] Thus, the first and second heat exchangers 4, 5 are arranged parallel to each other and are individually flowed through depending on the position of the 2 / 3-way valve.

[0043] Furthermore, a control unit 10 is provided to control the cooling system 1. As can be seen from Fig. 1, the control unit 10 is connected to the 2 / 3-way valve 7 and to temperature sensors 9 arranged in the machine hall 2. Temperature sensors 9 detect a hall temperature, which is used as a controlled variable for controlling the cooling system 1.

[0044] As can be seen from Fig. 2, a central control 10 can be provided for all cooling arrangements of the three machines M1, M2, M3.

[0045] The control unit 10 also controls a heating and / or air conditioning system 15, which may also be used to control the temperature of the hall in addition to the cooling arrangement according to the invention.

[0046] To minimize energy costs, the cooling system of each machine M1, M2, and M3 is controlled in a first operating mode or a second operating mode. The cooling systems of the three machines M1, M2, and M3 can each be controlled individually.

[0047] Fig. 3 shows a schematic temperature curve K of the hall temperature T over time t. A starting temperature To lies between a predetermined minimum temperature Tmin and a predetermined maximum temperature Tmax. Depending on the hall temperature T, the control unit 10 now operates the cooling arrangement 1. In the range between Tmin and Tmax, the heating and / or air conditioning system can remain switched off (Fig. 3, area A). If the hall temperature T rises, as shown in Fig. 3, cooling arrangements of the machines M1, M2, M3 are gradually switched to the second operating mode. For this purpose, the control unit 10 switches the cooling arrangements of the machines M1, M2, M3 to the second operating mode, in which the 2 / 3-way valve 7 is designed such that the medium flowing back from the return line 11b is guided into the branch line 11c.This results in heat transfer from the first cooling circuit 11 to the third cooling circuit 13, so that the heat can then be released to the environment outside the machine hall via the ambient cooler 6.

[0048] If the hall temperature T continues to rise and exceeds the maximum temperature Tmax at time h, a cooling process must be carried out by the heating and / or air conditioning system 15 to reduce the temperature in the machine hall. The heating and / or air conditioning system 15 is switched on by the control unit 10 in order to cool the machine hall 2. This is indicated in Fig. 3 by area B. As soon as the temperature is again between the maximum temperature T max and the minimum temperature T min (in Fig. 3 area C), the heating and / or air conditioning system 15 can be switched off again and the temperature in the machine hall 2 can be controlled by switching the cooling arrangements 1 of the machines M1, M2, M3 between operating mode 1 and operating mode 2.

[0049] Should the temperature fall below the minimum temperature Tmin, as shown in Fig. 3 at time t3, all cooling arrangements 1 of the machines M1, M2, M3 are already operated in the first operating mode, in which the machine hall 2 is heated by the machine coolers 3. The 2 / 3-way valve 7 is switched in such a way that the first cooling circuit 11 only leads through the first heat exchanger 4, so that the heat can be released into the machine hall 2 via the machine cooler 3. However, the heating output by the machine coolers 3 of the machines M1, M2, M3 in the first operating mode may not be sufficient, so that the heating and / or air conditioning system 15 must be switched on in order to heat (area D). At time t4, the temperature curve reaches the minimum temperature Tmin again, so that the heating and / or air conditioning system 15 that has been switched on as a support can be switched off again.

[0050] Thus, by means of the method according to the invention, in which the heat generated in a machine can either be used to heat the machine hall (first operating mode) or by dissipating the heat absorbed from the machine to an environment 8 outside the machine hall 2 via the third cooling circuit 13 and the ambient cooler 6, support of the heating and / or air conditioning system 15 can be achieved, which leads to significant energy savings in the heating and / or air conditioning system 15. In the optimal case, the heating and / or air conditioning system 15 can be completely switched off and the temperature of the machine hall 2 can be controlled exclusively by switching the cooling arrangements 1 between the first and second operating modes.

[0051] Fig. 4 shows a cooling arrangement 1 according to a second embodiment of the invention. Identical or functionally identical parts are designated by the same reference numerals as in the first embodiment.

[0052] As can be seen from Fig. 4, in contrast to the first embodiment, the first cooling circuit 11 is designed differently in the second embodiment. Here, the first heat exchanger 4 and the second heat exchanger 5 are arranged in series in the first cooling circuit 11. The first heat exchanger 4 is arranged upstream of the second heat exchanger 5 in the flow direction. When the machine hall 2 is to be heated, the machine cooler 3 is operated so that heat absorbed by the machine M1 in the first cooling circuit 11 is transferred in the heat exchanger 4 to the second cooling circuit 12 and can be released from the machine cooler 3 to the machine hall 2. The ambient cooler 6 can remain switched off because no more heat needs to be removed from the first cooling circuit 11 in the heat exchanger 5.

[0053] If the machine hall 2 is not to be heated, the machine cooler 3 is switched off, so that the heat absorbed from the machine M 1 in the first cooling circuit 11 is simply conducted through the first heat exchanger 4 and then transferred to the third cooling circuit 13 in the second heat exchanger 5. For this purpose, the ambient cooler 6 must be switched on. This allows the absorbed heat to be dissipated from the machine hall 2 via the third cooling circuit 13 and the ambient cooler 6 and released into the environment 8.

[0054] Fig. 5 shows a cooling arrangement 1 according to a third embodiment of the invention, wherein again identical or functionally identical parts are designated by the same reference numerals.

[0055] The cooling arrangement 1 of the third exemplary embodiment shown in Fig. 5 is essentially constructed in the same way as the cooling arrangement 1 of the first exemplary embodiment, with the first and second heat exchangers 4, 5 being arranged in parallel and switched via the 2 / 3-way valve 7. In addition, in the third exemplary embodiment, an additional cooler 14 is arranged in a return line of the third cooling circuit 13. The additional cooler 14 can be switched on and off by the control unit 10 and is designed to cool the hall air in the machine hall 2. As a result, the additional cooler 14 can absorb heat from the hall air and conduct it via the return line of the third cooling circuit 13 to the ambient cooler 6, where it is released to the environment 8. The heat absorption by the additional cooler 14 is indicated in Fig. 5 by the arrow Q. Otherwise, this exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description given there.In addition to the above written description of the invention, reference is hereby explicitly made to the graphic representation of the invention in Figs. 1 to 5 for its supplementary disclosure.

[0056] List of reference symbols

[0057] 1 cooling arrangement

[0058] 2 Machine hall

[0059] 3 machine coolers

[0060] 4 first heat exchanger

[0061] 5 second heat exchanger

[0062] 51 first connection

[0063] 52 second connection

[0064] 6 ambient coolers

[0065] 7 2 / 3-way valve

[0066] 8 Surroundings

[0067] 9 Temperature sensor

[0068] 10 Control unit

[0069] 11 first cooling circuit

[0070] 11a Inlet

[0071] 11b Return

[0072] 11c branch line

[0073] 12 second cooling circuit

[0074] 13 third cooling circuit

[0075] 14 additional coolers

[0076] 15 Heating and / or air conditioning system

[0077] 16 spindle

[0078] 21 tanks

[0079] 22 Pump

[0080] 23 Drive

[0081] 24 coolant

[0082] K temperature curve

[0083] M1 machine

[0084] M2 machine

[0085] M3 machine

[0086] Q Arrow (Heat)

[0087] T Hall temperature

[0088] TO starting temperature

[0089] Tmin minimum temperature

[0090] Tmax maximum temperature

Claims

Claims 1. Cooling arrangement (1) for cooling a machine (M1 , M2, M3) in a machine hall (2), comprising: - a first cooling circuit (11) which is set up to cool at least one area of ​​the machine (M1 , M2, M3), - a second cooling circuit (12) which is connected to a machine cooler (3) to dissipate heat into the machine hall (2), wherein a first heat exchanger (4) is arranged between the first cooling circuit (11) and the second cooling circuit (12) to transfer heat between the first and second cooling circuits (11, 12), and - a second heat exchanger (5) through which the first cooling circuit (11) can flow and which has a first connection (51) and a second connection (52), designed for connection with a third cooling circuit (13) which is connected to an ambient cooler (6) outside the machine hall (2).

2. Cooling arrangement according to claim 1, wherein the first and second heat exchangers (4, 5) are arranged in series in the first cooling circuit (11) and are successively flowed through in this sequence by the first cooling circuit (11).

3. Cooling arrangement according to claim 1, further comprising a 2 / 3-way valve (7) and a branch line (11c) branching off from the first cooling circuit (11) and leading to the second heat exchanger (5), wherein the first cooling circuit (11) can be switched by means of the 2 / 3-way valve (7) such that the first cooling circuit (11) passes through the first heat exchanger (4) or the second heat exchanger (5) in the branch line (11c).

4. Cooling arrangement according to one of the preceding claims, wherein the third cooling circuit (13) connects the second heat exchanger (5) to the ambient cooler (6), which is configured to transfer heat between the third cooling circuit (13) and an external environment (8).

5. Cooling arrangement according to claim 4, if dependent on claim 3, further comprising a temperature sensor (9) in the machine hall (2) and a control unit (10) which is configured to switch the 2 / 3-way valve (7) depending on a temperature determined by means of the temperature sensor (9) and / or is configured to switch the machine cooler (3) and / or the ambient cooler (6) on and off depending on the temperature determined by means of the temperature sensor (9).

6. Cooling arrangement according to one of the preceding claims, wherein in the third cooling circuit (13) an additional cooler (14) that can be switched on and off is arranged, which is configured to cool hall air into the machine hall (2).

7. Cooling arrangement according to one of the preceding claims, wherein the first and second heat exchanger (4, 5) is a plate heat exchanger, and wherein the first and second heat exchanger (4, 5) are arranged in the first cooling circuit (11) in the return from the area of ​​the machine to be cooled or in the supply to the area of ​​the machine to be cooled.

8. Cooling arrangement according to one of claims 5 to 7, wherein the control unit (10) is configured to switch on and off the machine cooler (3) and / or the ambient cooler (6) after a predetermined time interval.

9. Machine, in particular machine tool comprising a cooling arrangement (1) according to one of the preceding claims.

10. Machine arrangement in a machine hall (2) comprising a plurality of machines (M1 , M2, M3) according to the preceding claim.

11. Method for operating a machine (M1, M2, M3) with a cooling arrangement (1) according to any one of claims 1 to 8, wherein heat generated by the machine (M1, M2, M3) is absorbed by means of a first cooling circuit (11) and transferred to a second cooling circuit (12) for heating the machine hall (2) or to a third cooling circuit (13) for dissipating the heat absorbed from the first cooling circuit (11) to an environment (8) outside the machine hall (2) in order to temper the machine hall (2) in which the machine (M1, M2, M3) is located.

12. Method according to claim 11, wherein several machines (M1, M2, M3) each have their own cooling arrangement (1) and each cooling arrangement (1) is individually controlled.

13. Method according to claim 11 or 12, - wherein the machine hall (2) has a heating and / or air conditioning system (15) and the third cooling circuit (13) is part of the heating and / or air conditioning system (15).

14. Method according to claim one of claims 11 to 13, wherein the heating and / or air conditioning system (15) is controlled depending on an operating mode of the cooling arrangement (1) and in particular is switched off when the machine hall (2) can be tempered exclusively by the cooling arrangements (1) of the machines (M1 , M2, M3).

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