EP4522929A1 - Verfahren für den betrieb eines kühlgeräts im leckagefall und ein entsprechendes kühlgerät - Google Patents
Verfahren für den betrieb eines kühlgeräts im leckagefall und ein entsprechendes kühlgerätInfo
- Publication number
- EP4522929A1 EP4522929A1 EP23734456.9A EP23734456A EP4522929A1 EP 4522929 A1 EP4522929 A1 EP 4522929A1 EP 23734456 A EP23734456 A EP 23734456A EP 4522929 A1 EP4522929 A1 EP 4522929A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- evaporator
- cooling device
- compressor
- refrigerant
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—Component parts or details not otherwise provided for in this subclass
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/221—Preventing leaks from developing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/222—Detecting refrigerant leaks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
Definitions
- the invention is based on a method for operating a cooling device for control cabinet air conditioning or the air conditioning of an IT environment, for example a data center, which has the operation of a refrigeration machine of the refrigeration device, the refrigeration machine having a refrigerant circuit with a compressor, a condenser, and an expansion element and an evaporator.
- the method further comprises detecting a leak in the refrigerant circuit, with refrigerant escaping from the refrigerant circuit.
- Such a method and a corresponding cooling device are known from DE 102018109604 Ai.
- a flow of the evaporator between the evaporator and the condenser is shut off and the compressor is activated and/or kept activated.
- the invention is based on the finding that in the internal air circuit of the cooling device, that is to say in that area of the cooling device which is open to the control cabinet atmosphere or to the atmosphere of the IT environment, for example a data center, the evaporator is particularly susceptible to leakage.
- the evaporator or a piping system of the evaporator that is connected to the refrigerant circuit is brought to a negative pressure relative to the atmosphere in the interior of the control cabinet housing or the IT environment, or the internal pressure in the piping system is further adjusted to the atmospheric pressure,
- the uncontrolled leakage of refrigerant which could lead to critical enrichment of the refrigerant, can be particularly effectively prevented.
- the evaporator can be designed, for example, as an air-liquid heat exchanger.
- the air-liquid heat exchanger can have a fin package through which the air flowing through the evaporator passes.
- the plate pack can be penetrated by a pipe system connected to the refrigerant circuit in order to achieve heat exchange between the air flowing through the evaporator and the refrigerant flowing through the pipe system.
- the pipe system passing through the evaporator, in particular the plate pack can have a large number of straight pipe sections which run parallel to one another and which are connected to one another on opposite end faces of the evaporator via pipe bends, in particular 180° pipe bends.
- the connection points can in particular be designed as joints, for example as soldering points, which are susceptible to leakage.
- the pipe bends themselves are also more sensitive to leakage than the straight pipe section.
- the method according to the invention can accordingly be set up to empty the refrigerant in particular from the evaporator and preferably also the remaining components of the refrigerant circuit arranged in the inner air circuit in the event of a leak.
- activating and/or keeping the compressor activated involves emptying the refrigerant circuit at least in a line section of the refrigerant circuit which is arranged in an internal air circuit of the cooling device.
- Refrigerant emptied from the line section of the refrigerant circuit arranged in the inner air circuit can be transferred to a line section of the refrigerant circuit arranged in the outer air circuit.
- Transferring the refrigerant into a line section arranged in the external air circuit can include introducing the refrigerant into a buffer storage, preferably into an air-liquid heat exchanger of the condenser, particularly preferably into a line system of the air-liquid heat exchanger, with which the refrigerant is in thermal contact with a large number of fins of the air-liquid heat exchanger is passed through the air-liquid heat exchanger.
- the expansion element can be moved into a closed position that is completely impermeable or essentially impermeable to the refrigerant. Accordingly, no further shut-off device is required, so that the method can be carried out with cooling devices known from the prior art without any structural redesign.
- Activating and/or keeping the compressor activated can include increasing the speed of the compressor, with the compressor preferably being operated at a maximum speed.
- Shutting off the flow of the evaporator between the evaporator and the condenser can include shutting off a line section of the refrigerant circuit, which is arranged in an external air circuit of the cooling device.
- the compressor can be kept activated either for a predetermined minimum duration and/or until a section of the refrigerant circuit, including the evaporator, arranged in the inner air circuit of the cooling device is completely or substantially completely emptied of the refrigerant .
- the method can include shutting off a suction line of the compressor, via which the compressor is connected to a return line of the evaporator, and, if necessary, deactivating the compressor. Deactivation preferably takes place after the suction line has been shut off.
- a cooling device for control cabinet air conditioning or the air conditioning of an IT environment, in particular a data center.
- the cooling device accordingly has a refrigeration machine with a refrigerant circuit, the refrigerant circuit having a compressor, a condenser, an expansion element and an evaporator.
- a flow of the evaporator has a shut-off element between the evaporator and the condenser, which is designed to completely close the flow in the event of a leak in the refrigerant circuit.
- the cooling device is not limited to any specific designs and can be, for example, a compact cooling device for hanging installation on a control cabinet housing, a slide-in cooling device for integration into a series of control cabinets, a split device, or the like.
- the shut-off element can be the expansion element of the refrigerant circuit.
- An additional shut-off device for carrying out the method according to the invention would therefore not be necessary.
- the shut-off device can be motor-driven. It can be controlled by a regulation and control unit that has a signal input for a refrigerant sensor.
- the refrigerant sensor can be arranged in or on the cooling device or positioned independently of the cooling device.
- the refrigerant sensor can be arranged on an outside of the cooling device facing a control cabinet interior or an IT environment, for example in a data center.
- the refrigerant sensor can be arranged, for example, in an air inlet opening or an air outlet opening of an internal air circuit of the cooling device or in the internal air circuit of the cooling device.
- the refrigerant sensor can be wireless or be connected by wire to the signal input of the control unit for signal transmission.
- the cooling device can have a further, preferably motor-driven shut-off device in a suction line of the compressor.
- the further shut-off device can serve to fluidically separate the section of the refrigerant circuit arranged in the inner air circuit with its components integrated therein, for example the evaporator, from the part of the refrigerant circuit arranged in the outer air circuit after at least the evaporator or a section of the refrigerant circuit arranged in the inner air circuit has been emptied to be separated, with the refrigerant being kept in the part of the refrigerant circuit arranged in the external air circuit.
- At least the condenser, the compressor and at least one fan for supplying air to the condenser can be accommodated separately from the evaporator in a separate housing, which is connected to the flow and return of the evaporator via two pipeline sections.
- the cooling device can be designed as a so-called split device with separate housings that are connected to one another via the two pipeline sections.
- the pipeline section connected to the flow of the evaporator can have the shut-off device.
- the shut-off device can preferably be arranged along the pipeline section closer to the evaporator than to the condenser. This ensures that in the event of a leak, the pipeline sections can be used as buffer storage for the refrigerant emptied from the evaporator.
- the pipeline section connected to the return of the evaporator and the suction line of the compressor can have a further shut-off device.
- the further shut-off device can be arranged along the pipeline section closer to the evaporator than to the compressor.
- the pipeline section can serve as a buffer storage for refrigerant in the event of a leak.
- the compressor, the condenser, the expansion element, the evaporator and the at least one shut-off element can be connected via a piping system Refrigerant circuit be connected to each other.
- the piping system can be conditioned in terms of its volume, in particular at least one of the piping cross-section and piping length, in such a way that in the event of a leak when the flow of the evaporator is shut off, the piping system is a buffer storage for refrigerant compressed by the compressor.
- the compressor can be arranged in the inner air circuit, preferably in a housing in which at least the evaporator and the compressor are arranged.
- the housing can preferably be designed independently of a further housing in which the condenser and the external air circuit are arranged.
- the housing can be arranged with the inner air circuit in an IT environment, for example in a data center, and the further housing with the outer air circuit can be arranged outside the IT environment.
- Figure i shows an exemplary embodiment of a control cabinet arrangement with a cooling device according to the invention.
- Figure 2 shows an exemplary embodiment of an IT environment with a further embodiment of a cooling device according to the invention.
- the embodiment according to Figure 1 essentially consists of a control cabinet housing on which a cooling device i is mounted, for example, hanging.
- the cooling device 1 has an air inlet in the inner air circle 7 for warm air on a vertical side wall in an upper area and an air outlet from the inner air circle 7 for cooled air in a lower area.
- heat-emitting components (not shown) can be arranged, which are acted upon by air cooled with the aid of the cooling device 100.
- the components in the interior 101 can generate arcs during operation, which, in the event of a leak, could ignite a refrigerant emerging from the cooling device 1, which forms a stoichiometric mixture with the air in the interior 101 in the atmosphere of the interior 101.
- the cooling device 1 accordingly has an internal air circuit 7, through which the air received in the control cabinet interior 101 is passed and thereby passes an evaporator 5, whereby the air cools down.
- Fluidically separated from the inner air circuit 7 is an outer air circuit 8, through which ambient air is passed. In a lower area of the outer air circuit 8, ambient air is introduced into the outer air circuit 8. The ambient air acts on the condenser 3 and leaves the external air circuit 8 as heated air in an upper region of the cooling device 1.
- a compressor 3 and an expansion element 4 are also arranged in the external air circuit 8.
- the expansion element 4 continues to function as a shut-off element 11.
- the function of a shut-off device 11 is required to carry out the method according to the invention. Accordingly, if a leak in the refrigerant circuit is detected, the cooling device can be operated in such a way that the refrigerant received in the refrigerant circuit concentrates in the area of the refrigerant circuit arranged in the outer air circuit 8 and in particular the evaporator arranged in the inner air circuit and particularly sensitive to leakage is emptied or essentially emptied becomes.
- a refrigerant sensor can be arranged in the inner air circuit 7 or in the interior 101.
- the flow 6 of the evaporator 5 between the evaporator 5 and the condenser 3 is shut off.
- the compressor 2 is activated if it is not already in an active state. If the compressor 2 is already in an active state, it is kept in the active state in order to achieve the most complete emptying of the evaporator 5 and the remaining pipe sections of the refrigerant circuit arranged in the inner air circuit 7.
- the housing 13 is connected to the flow 6 and the return 10 of the evaporator 5 via two pipeline sections.
- the embodiment shown in Figure 2 is therefore particularly suitable for the air conditioning of an IT environment, for example one Data center, in which the housing 13 with the condenser 3 can be arranged outside the IT environment or the data center, for example on the roof of a container or a building.
- the embodiment according to FIG. 2 has a further shut-off element 12 in the return line 10 of the evaporator 5.
- This can serve to separate the components arranged in the inner air circuit 7 from the rest of the refrigerant circuit after the evaporator 5 or the components of the refrigerant circuit arranged in the inner air circuit 7 have been emptied, after which the compressor 2 could also be deactivated without risking that Refrigerant flows back into the part of the refrigerant circuit arranged in the inner air circuit.
- the further shut-off element 12 can also be implemented in the embodiment shown in FIG.
- the evaporator is formed in a housing 15 with an air inlet and an air outlet.
- the inner air circuit is passed through the evaporator 5.
- the two shut-off devices 11, 12 are also accommodated in the housing 15.
- warm air from the interior 1001 of the IT environment 1000, for example from a data center is sucked into the inner air circuit 7, passed through the evaporator 5 and in a lower area of the housing 15 from the inner air circuit 7 or the Housing 15 is introduced back into the interior 1001.
- the compressor 2 is arranged in the inner air circuit.
- the housing 13 for the condenser 3 can be an outdoor housing, which is arranged, for example, outside a data center, for example on the roof of a data center.
- a collector 14 is also arranged in the housing 13 of the condenser 3 in order to provide a holding volume for refrigerant in the event of a leak and when the flow 6 of the evaporator 5 is shut off with the shut-off element 4.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022117366.6A DE102022117366A1 (de) | 2022-07-12 | 2022-07-12 | Verfahren für den betrieb eines kühlgeräts im leckagefall und ein entsprechendes kühlgerät |
| PCT/DE2023/100455 WO2024012625A1 (de) | 2022-07-12 | 2023-06-19 | Verfahren für den betrieb eines kühlgeräts im leckagefall und ein entsprechendes kühlgerät |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4522929A1 true EP4522929A1 (de) | 2025-03-19 |
Family
ID=87036498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23734456.9A Pending EP4522929A1 (de) | 2022-07-12 | 2023-06-19 | Verfahren für den betrieb eines kühlgeräts im leckagefall und ein entsprechendes kühlgerät |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4522929A1 (de) |
| CA (1) | CA3258108A1 (de) |
| DE (1) | DE102022117366A1 (de) |
| MX (1) | MX2024016060A (de) |
| WO (1) | WO2024012625A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4102179A1 (de) * | 1991-01-25 | 1992-07-30 | Siemens Ag | Verfahren und anordnung zum betreiben einer kaeltemaschine |
| JP3523381B2 (ja) * | 1995-07-26 | 2004-04-26 | 株式会社日立製作所 | 冷蔵庫 |
| JP4178646B2 (ja) * | 1999-02-09 | 2008-11-12 | 松下電器産業株式会社 | 冷蔵庫 |
| EP3598023B1 (de) * | 2017-03-13 | 2023-06-07 | Mitsubishi Electric Corporation | Kältekreislaufvorrichtung |
| DE102018109604B4 (de) | 2018-04-20 | 2019-10-31 | Rittal Gmbh & Co. Kg | Schaltschrankanordnung mit Sicherheitsfunktion sowie ein entsprechendes Verfahren |
| WO2020051314A1 (en) * | 2018-09-06 | 2020-03-12 | Carrier Corporation | Refrigerant leak detection system |
-
2022
- 2022-07-12 DE DE102022117366.6A patent/DE102022117366A1/de active Pending
-
2023
- 2023-06-19 WO PCT/DE2023/100455 patent/WO2024012625A1/de not_active Ceased
- 2023-06-19 CA CA3258108A patent/CA3258108A1/en active Pending
- 2023-06-19 EP EP23734456.9A patent/EP4522929A1/de active Pending
-
2024
- 2024-12-18 MX MX2024016060A patent/MX2024016060A/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE102022117366A1 (de) | 2024-01-18 |
| WO2024012625A1 (de) | 2024-01-18 |
| MX2024016060A (es) | 2025-02-10 |
| CA3258108A1 (en) | 2025-04-22 |
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