EP3569955B1 - Gekühltes lager - Google Patents

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Publication number
EP3569955B1
EP3569955B1 EP17891439.6A EP17891439A EP3569955B1 EP 3569955 B1 EP3569955 B1 EP 3569955B1 EP 17891439 A EP17891439 A EP 17891439A EP 3569955 B1 EP3569955 B1 EP 3569955B1
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EP
European Patent Office
Prior art keywords
refrigerant
warehouse
leakage detector
air
time
Prior art date
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Active
Application number
EP17891439.6A
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English (en)
French (fr)
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EP3569955A1 (de
EP3569955A4 (de
Inventor
Yumei OKABE
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
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Publication of EP3569955A1 publication Critical patent/EP3569955A1/de
Publication of EP3569955A4 publication Critical patent/EP3569955A4/de
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Publication of EP3569955B1 publication Critical patent/EP3569955B1/de
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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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • 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
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/008—Alarm devices

Definitions

  • the present invention relates to a cooling warehouse that discharges refrigerant that has leaked inside the warehouse to the outside of the warehouse.
  • Prefabricated refrigerators or prefabricated freezers have been known as cooling warehouses, and people, forklifts, and other objects may go in and out of the cooling warehouses. Furthermore, an indoor unit called a unit cooler included in a refrigeration cycle apparatus that uses refrigerant is provided inside a cooling warehouse, so that the inside of the cooling warehouse is cooled by the indoor unit.
  • fluorocarbon-based refrigerant which has low flammability and low toxicity, has been often used.
  • a refrigerant having low GWP that is, global warming potential, has been paid attention to, and more products using fluorocarbon-based refrigerant containing slightly flammable refrigerant have been available as refrigeration cycle apparatuses for cooling warehouses.
  • the housing of a cooling warehouse is made of insulating panels, and joints of the insulating panels are sealed. Consequently, extremely high airtightness of such a cooling warehouse is achieved.
  • the specific gravity of fluorocarbon-based refrigerant containing slightly flammable refrigerant is greater than the specific gravity of air. Consequently, if refrigerant leaks out of an indoor unit, the refrigerant may disadvantageously stagnate inside the cooling warehouse.
  • a cooling apparatus using flammable refrigerant that includes a fan and a refrigerant sensor provided at an indoor unit is suggested in which in a case where the refrigerant sensor detects leaking refrigerant, the fan is driven to rotate so that the refrigerant can be discharged outside through an air supply-exhaust port that communicates the inside of the indoor unit with the outside (for example, see Patent Literature 1).
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 8-200904
  • WO2016/080050 A1 discloses an air conditioning device having an outlet in a front surface of the housing, and a leak detection system made of a plurality of refrigerant concentration sensors placed at different heights.
  • US6772598 B1 discloses a refrigerant leak detection system.
  • Patent Literature 1 detects refrigerant only using one refrigerant sensor that is provided at one portion of the indoor unit, and is thus not able to determine the degree of leakage of refrigerant. Consequently, a problem has present in that a cooling operation is stopped even when the degree of leakage of refrigerant is low and an accommodated object that needs to be cooled down may thus be damaged.
  • the present invention has been designed to solve the problem mentioned above, and an object of the present invention is to provide a cooling warehouse that is able to determine the degree of leakage of refrigerant.
  • a cooling warehouse according to the present invention is set forth in claim 1.
  • a cooling warehouse includes a plurality of leakage detectors that are provided at different heights in the cooling warehouse and each detect refrigerant and a controller that controls an air-sending device depending on whether or not one of the plurality of leakage detectors detects refrigerant, whether or not another of the plurality of leakage detectors detects refrigerant, and a time during which refrigerant has been detected by each of the plurality of leakage detectors. Consequently, the cooling warehouse is able to determine the degree of leakage of refrigerant.
  • Fig. 1 is a cross-sectional view illustrating a cooling warehouse 100 according to Embodiment of the present invention.
  • the cooling warehouse 100 includes a warehouse main body 1, an introduction lid 32a, an introduction port air-sending device 32b, a discharge lid 31a, a discharge port air-sending device 31b, an outdoor unit 21, indoor units 22, a lower-position leakage detector 41a, a higher-position leakage detector 41b, and a controller 50. Furthermore, a refrigeration cycle apparatus 10 is provided in the cooling warehouse 100.
  • the warehouse main body 1 is, for example, a housing of a box type serving as the outer shell of the cooling warehouse 100, and a floor face 1a, wall faces 1b, and a ceiling face 1c each include an insulating panel 1f. Furthermore, the warehouse main body 1 is provided with an introduction port 32 and a discharge port 31. The warehouse main body 1 also has a doorway (not illustrated in the drawing) through which a person 2, a load 3, and other objects enter or exit, and a door 1e is provided at the doorway.
  • the cooling warehouse 100 is, for example, a prefabricated refrigerator, and joints of the insulating panels 1f around the warehouse main body 1 are sealed.
  • the inside of the warehouse main body 1 may be referred to as “inside the warehouse”
  • the outside of the warehouse main body 1 may be referred to as "outside the warehouse”.
  • the introduction port 32 is an opening port through which air outside the warehouse is introduced into the warehouse.
  • the introduction port 32 is formed, for example, at the wall face 1b positioned on the right when Fig. 1 is viewed from front.
  • the introduction port 32 is formed, for example, between a position corresponding to two-thirds of the height of the warehouse main body 1 and the ceiling face 1c, that is, formed at a position corresponding to two-thirds or more of the height of the warehouse main body 1.
  • the introduction port 32 may be formed at the ceiling face 1c of the warehouse main body 1.
  • the discharge port 31 is an opening port through which air inside the warehouse is discharged out of the warehouse.
  • the discharge port 31 is formed, for example, at the wall face 1b positioned on the left when Fig. 1 is viewed from front.
  • the discharge port 31 is formed, for example, between the floor face 1a and a position corresponding to one-third of the height of the warehouse main body 1, that is, formed at a position corresponding to one-third or less of the height of the warehouse main body 1.
  • the introduction port 32 may be formed at the floor face 1a of the warehouse main body 1.
  • the introduction lid 32a is provided at the introduction port 32 to open and close the introduction port 32.
  • the introduction port air-sending device 32b is provided inside the warehouse and in the vicinity of the introduction port 32 and the introduction lid 32a.
  • the introduction port air-sending device 32b allows air outside the warehouse to be introduced when the introduction lid 32a is opened.
  • the introduction port air-sending device 32b allows air inside the warehouse to be stirred when the introduction lid 32a is closed.
  • the discharge lid 31a is provided at the discharge port 31 to open and close the discharge port 31.
  • the discharge port air-sending device 31b is provided inside the warehouse and in the vicinity of the discharge port 31 and the discharge lid 31a.
  • the discharge port air-sending device 31b allows air inside the warehouse to be discharged when the discharge lid 31a is opened.
  • the discharge port air-sending device 31b allows air inside the warehouse to be stirred when the discharge lid 31a is closed.
  • Each of the introduction port air-sending device 32b and the discharge port air-sending device 31b
  • the discharge port air-sending device 31b and the introduction port air-sending device 32b each have a capability of generating an air volume that is equal to or more than the amount of ventilation multiplied by the number of ventilation times calculated by a mathematical formula 1 shown below.
  • Number of ventilation times n 400 / warehouse internal volume V m 3
  • discharge port air-sending device 31b and the introduction port air-sending device 32b each have a capability of generating a wind velocity of 1.8 meters or more per second.
  • the refrigerant will need to be stirred or ventilation will need to be performed before the refrigerant stagnates inside the warehouse to an extent that refrigerant-air mixture has the lowest density that can propagate frame, and the above-mentioned air volume and wind velocity are necessary for this case.
  • the above-mentioned air volume and wind velocity are values for the case where flammable refrigerant that is available at the present time is used for the refrigeration cycle apparatus 10.
  • the outdoor unit 21 is installed outside the warehouse.
  • a compressor 11 and an outdoor heat exchanger 12, which will be described later, are installed inside the outdoor unit 21.
  • the indoor units 22 are installed inside the warehouse.
  • an expansion unit 13 and an indoor heat exchanger 14, which will be described later, are installed inside each of the indoor units 22.
  • the indoor units 22 are installed in such a manner that the indoor units 22 are suspended from the ceiling face 1c.
  • the indoor units 22 may not be suspended from the ceiling and may be installed on the floor or wall.
  • the number of indoor units installed may be one or three or more.
  • the lower-position leakage detector 41a and the higher-position leakage detector 41b are provided at different heights inside the warehouse and each detect refrigerant leaking inside the warehouse.
  • the lower-position leakage detector 41a is provided, for example, in a space inside the warehouse between the floor face 1a and a position 20 centimeters above the floor face 1a.
  • the width or depth of the warehouse main body 1 is 8 meters or more, one or more lower-position leakage detectors 41a are provided within a horizontal distance of 8 meters from an end part of the indoor unit 22 of the refrigeration cycle apparatus 10.
  • the lower-position leakage detector 41a is provided, for example, in a space inside the warehouse between the floor face 1a and a position 5 centimeters above the floor face 1a.
  • the higher-position leakage detector 41b is provided, for example, in a space inside the warehouse between the floor face 1a and a position corresponding to one-third of the height of the warehouse main body 1.
  • the cooling warehouse 100 is able to determine the degree of leakage of refrigerant on the basis of whether or not the lower-position leakage detector 41a detects refrigerant, whether or not the higher-position leakage detector 41b detects refrigerant, and the time during which refrigerant has been detected by each of the lower-position leakage detector 41a and the higher-position leakage detector 41b, or the time needed for the higher-position leakage detector 41b to detect leaking refrigerant after the lower-position leakage detector 41a detects leaking refrigerant.
  • the time during which refrigerant has been detected mentioned above represents the length of time during which refrigerant has been detected.
  • the lower-position leakage detector 41a and the higher-position leakage detector 41b detect leaking refrigerant within a short time or at the same time.
  • the higher-position leakage detector 41b is provided, for example, in a space inside the warehouse between the ceiling face 1c and a position 5 centimeters below the ceiling face 1c.
  • the lower-position leakage detector 41a is provided in a space between a position corresponding to two-thirds of the height of the warehouse main body 1 and the ceiling face 1c, that is, in a space corresponding to two-thirds or more of the height of the warehouse main body 1.
  • the controller 50 includes, for example, dedicated hardware or a Central Processing Unit (also referred as a CPU, a central processing device, a processing device, a computing device, a microprocessor, a microcomputer, or a processor) that executes a program stored in a memory 52 (see Fig. 3 , which will be described later). Furthermore, the controller 50 controls the discharge port air-sending device 31b, the introduction port air-sending device 32b, and other devices depending on results of detection by the lower-position leakage detector 41a and the higher-position leakage detector 41 b.
  • a Central Processing Unit also referred as a CPU, a central processing device, a processing device, a computing device, a microprocessor, a microcomputer, or a processor
  • Fig. 2 is a circuit diagram illustrating the refrigeration cycle apparatus 10 according to Embodiment of the present invention.
  • the refrigeration cycle apparatus 10 includes, for example, a refrigerant circuit in which the compressor 11, the outdoor heat exchanger 12, the expansion units 13, and the indoor heat exchangers 14 are connected by a pipe 24 and through which refrigerant circulates. Furthermore, the refrigeration cycle apparatus 10 includes the outdoor unit 21 and the indoor units 22, and the outdoor unit 21 and the indoor units 22 are connected by the pipe 24.
  • the pipe 24 includes, as illustrated in Fig. 1 , an outside pipe 24a that is positioned outside the warehouse in a region from the outdoor unit 21 to the warehouse main body 1 and an inside pipe 24b that is positioned inside the warehouse in a region from the warehouse main body 1 to the indoor units 22.
  • a set of the outside pipe 24a and the inside pipe 24b corresponds to, as illustrated in Fig. 2 , a set of a high-pressure pipe 24c that extends from the outdoor unit 21 to the indoor units 22 and a low-pressure pipe 24d that returns from the indoor units 22 to the outdoor unit 21.
  • a high-pressure pipe isolation valve 25a is provided at the high-pressure pipe 24c
  • a low-pressure pipe isolation valve 25b is provided at the low-pressure pipe 24d.
  • the high-pressure pipe isolation valve 25a and the low-pressure pipe isolation valve 25b which are opened or closed at desired timing by the controller 50, may be replaced with solenoid valves that each are opened when the solenoid valve is electrically connected and closed when the solenoid valve is not electrically connected.
  • the compressor 11 compresses refrigerant.
  • the outdoor heat exchanger 12 exchanges heat between air outside the warehouse and refrigerant to condense the refrigerant.
  • the expansion units 13 each expand and decompress refrigerant.
  • the indoor heat exchangers 14 each exchange heat between air inside the warehouse and refrigerant to evaporate the refrigerant.
  • Refrigerant to be used for the refrigeration cycle apparatus 10 is, for example, slightly flammable refrigerant.
  • Refrigerant is sucked into the compressor 11 of the outdoor unit 21, compressed by the compressor 11, and discharged as refrigerant in a high-temperature, high-pressure gas state.
  • the discharged refrigerant flows into the outdoor heat exchanger 12.
  • the refrigerant that has flowed into the outdoor heat exchanger 12 is subjected to heat exchange with air outside the warehouse and condensed.
  • the condensed refrigerant flows into the expansion unit 13 of each of the indoor units 22, and is expanded and decompressed by the expansion unit 13.
  • the expanded and decompressed refrigerant flows into the indoor heat exchanger 14.
  • the refrigerant that has flowed into the indoor heat exchanger 14 is subjected to heat exchange with air inside the warehouse and is evaporated. At this time, the air inside the warehouse is cooled down, so that the inside of the warehouse is cooled down. Subsequently, the evaporated refrigerant is sucked into the compressor 11.
  • a flow switching device may be provided in the refrigeration cycle apparatus 10. With the provision of a flow switching device, a heating operation can be performed by switching flows of the flow switching device.
  • Fig. 3 is a functional block diagram of the cooling warehouse 100 according to Embodiment of the present invention.
  • the controller 50 includes a measuring unit 51, the memory 52, a determination unit 53, and a driving unit 54.
  • the controller 50 is configured to receive signals from the lower-position leakage detector 41a and the higher-position leakage detector 41b. Furthermore, the controller 50 is configured to output signals to the compressor 11, the high-pressure pipe isolation valve 25a, the low-pressure pipe isolation valve 25b, the discharge lid 31a, the discharge port air-sending device 31b, the introduction lid 32a, the introduction port air-sending device 32b, and a notification unit 43.
  • the notification unit 43 is, for example, a sound output unit such as a speaker, a display unit such as an LED, a contact point with a remote centralized control panel or a controller, or all the sound output unit, display unit, and contact point.
  • the measuring unit 51 acquires signals detected by the lower-position leakage detector 41a and the higher-position leakage detector 41b.
  • the memory 52 stores various types of information.
  • the determination unit 53 performs various types of determination on the basis of a signal acquired by the measuring unit 51 and information stored in the memory 52. For example, a reference value is stored in the memory 52, and the determination unit 53 determines that the lower-position leakage detector 41a has detected refrigerant in the case where the value of a signal that the measuring unit 51 has acquired from the lower-position leakage detector 41a is equal to or more than the reference value stored in the memory 52.
  • the driving unit 54 outputs driving signals to the compressor 11, the high-pressure pipe isolation valve 25a, the low-pressure pipe isolation valve 25b, the discharge lid 31a, the discharge port air-sending device 31b, the introduction lid 32a, the introduction port air-sending device 32b, and the notification unit 43 on the basis of a result of a determination by the determination unit 53, so that the compressor 11, the high-pressure pipe isolation valve 25a, the low-pressure pipe isolation valve 25b, the discharge lid 31a, the discharge port air-sending device 31b, the introduction lid 32a, the introduction port air-sending device 32b, and the notification unit 43 can be driven.
  • Fig. 4 is a flowchart illustrating the flow of a control process by the controller 50 of the cooling warehouse 100 according to Embodiment of the present invention.
  • the controller 50 determines the degree of leakage of refrigerant on the basis of whether or not the lower-position leakage detector 41a detects refrigerant, whether or not the higher-position leakage detector 41b detects refrigerant, and the time during which refrigerant has been detected by each of the lower-position leakage detector 41a and the higher-position leakage detector 41b, or the time needed for the higher-position leakage detector 41b to detect leaking refrigerant after the lower-position leakage detector 41a detects leaking refrigerant, and performs control for reducing stagnation of refrigerant that has leaked depending on the degree of leakage of refrigerant.
  • the relationship of a first time, a second time, and a third time is represented by an inequation of the second time ⁇ the first time ⁇ the third time.
  • the first time, the second time, and the third time are stored in the memory 52.
  • the first time, the second time, and the third time each represent the length of a predetermined time.
  • the first time, the second time, and the third time are determined on the basis of the type of refrigerant for the refrigeration cycle apparatus 10 and the internal volume of the cooling warehouse 100.
  • the first time, the second time, and the third time may be set long for a refrigerant having high flammability and short for a refrigerant having low flammability.
  • the determination unit 53 of the controller 50 determines, on the basis of a signal input to the measuring unit 51 from the lower-position leakage detector 41a, whether or not the lower-position leakage detector 41a has detected refrigerant (step S1).
  • step S8 a normal cooling operation continues (step S8).
  • the driving unit 54 of the controller 50 operates the notification unit 43 to notify an external administrator that refrigerant has leaked inside the warehouse, drives the introduction port air-sending device 32b and the discharge port air-sending device 31b to stir the refrigerant that has leaked inside the warehouse, causes the compressor 11 to continue driving, and causes the refrigeration cycle apparatus 10 to continue operating (step S2), that is, the cooling operation continues running, and the process proceeds to step S3.
  • step S3 the determination unit 53 of the controller 50 determines, on the basis of signals input to the measuring unit 51 from the lower-position leakage detector 41a and the higher-position leakage detector 41b, whether or not the lower-position leakage detector 41a detects refrigerant and whether or not the higher-position leakage detector 41b detects refrigerant.
  • the driving unit 54 of the controller 50 operates the notification unit 43 to send to the external administrator a notification prompting to move an object accommodated in the warehouse and repair a position where the refrigerant has leaked (step S7).
  • step S3 the driving unit 54 of the controller 50 closes the high-pressure pipe isolation valve 25a and the low-pressure pipe isolation valve 25b to stop driving of the compressor 11, so that the operation of the refrigeration cycle apparatus 10 is stopped, that is, the cooling operation is stopped. Furthermore, after the driving unit 54 of the controller 50 operates the notification unit 43 to notify the external administrator that entry to the warehouse is not allowed (step S4), the process proceeds to step S5.
  • step S5 the determination unit 53 of the controller 50 determines, on the basis of signals input to the measuring unit 51 from the lower-position leakage detector 41a and the higher-position leakage detector 41b, whether or not the lower-position leakage detector 41a detects refrigerant and whether or not the higher-position leakage detector 41b detects refrigerant.
  • the driving unit 54 of the controller 50 operates the notification unit 43 to send to the external administrator a notification prompting to move an object accommodated in the warehouse and repair a position where the refrigerant has leaked (step S7).
  • the driving unit 54 of the controller 50 operates the notification unit 43 to notify the external administrator that the temperature inside the warehouse has increased, and opens the discharge lid 31a and the introduction lid 32a to open the discharge port 31 and the introduction port 32 (step S6).
  • the lower-position leakage detector 41a and the higher-position leakage detector 41b are a plurality of leakage detectors provided within an appropriate range from the position where refrigerant may leak, and the controller 50 is able to determine the degree of leakage of refrigerant on the basis of whether or not the lower-position leakage detector 41a detects refrigerant, whether or not the higher-position leakage detector 41b detects refrigerant, and the time during which refrigerant has been detected by each of the lower-position leakage detector 41a and the higher-position leakage detector 41b, or the time needed for the higher-position leakage detector 41b to detect leaking refrigerant after the lower-position leakage detector 41a detects refrigerant, that is, the refrigerant detection timing.
  • the controller 50 drives the introduction port air-sending device 32b and the discharge port air-sending device 31b. That is, in the case where the degree of leakage of refrigerant is low, the refrigerant that has leaked inside the warehouse is stirred while a cooling operation is continued. Consequently, damage to an object accommodated inside the warehouse that needs to be cooled down can be reduced while stagnation of refrigerant inside the warehouse is reduced.
  • the controller 50 closes the high-pressure pipe isolation valve 25a and the low-pressure pipe isolation valve 25b. That is, in the case where the degree of leakage of refrigerant is medium, the external administrator may be prompted to move an object accommodated inside the warehouse and repair a position where the refrigerant has leaked, while the cooling operation is stopped to block leakage of refrigerant.
  • the controller 50 opens the discharge lid 31a and the introduction lid 32a. That is, in the case where the degree of leakage of refrigerant is high, stagnation of refrigerant inside the warehouse can be reduced more reliably by discharging the refrigerant that has leaked inside the warehouse to the outside of the warehouse.
  • the high-pressure pipe isolation valve 25a and the low-pressure pipe isolation valve 25b may be replaced with solenoid valves that each open only when the solenoid valve is electrically connected.
  • the discharge port 31 is formed between the floor face 1a and a position corresponding to one-third of the height of the warehouse main body 1, that is, formed at a position corresponding to one-third or less of the height of the warehouse main body 1. Furthermore, the introduction port 32 is formed between a position corresponding to two-thirds of the height of the warehouse main body 1 and the ceiling face 1c, that is, formed at a position corresponding to two-thirds or more of the height of the warehouse main body 1.
  • Fig. 5 is a diagram for explaining the flow of air in a case where refrigerant leaks inside the cooling warehouse 100 according to Embodiment of the present invention.
  • the discharge port 31 and the introduction port 32 are formed at the positions mentioned above. Consequently, as illustrated in Fig. 5 , air outside the warehouse introduced into the warehouse via the introduction port 32 and through an introduction path 71 is discharged, together with refrigerant 6, which has a specific gravity greater than the specific gravity of air, leaking inside the warehouse and stagnating in the vicinity of the floor face 1a, to the outside of the warehouse through a discharge path 72 via the discharge port 31. For this reason, the refrigerant 6, which has a specific gravity greater than the specific gravity of air, can be discharged out of the warehouse effectively. That is, the refrigerant 6, which has a specific gravity greater than the specific gravity of air, can be discharged out of the warehouse easily and quickly. Furthermore, by setting the air volume of the discharge port air-sending device 31b and the introduction port air-sending device 32b to a value obtained by the mathematical formula 1 mentioned above, ventilation can be completed within a short time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (3)

  1. Kühllager (100), das Folgendes umfasst:
    einen Lagerhauptkörper (1), in dem eine Einführungsöffnung (32), durch die Luft außerhalb des Kühllagers (100) eingeführt wird, und eine Ausstoßöffnung (31), durch die Luft innerhalb des Kühllagers (100) ausgestoßen wird, ausgebildet sind;
    eine Luftbeförderungsvorrichtung (31b, 32b), die ausgelegt ist, um Luft außerhalb des Kühllagers (100) in ein Inneres des Kühllagers (100) einzuführen und Luft innerhalb des Kühllagers (100) aus dem Kühllager (100) auszustoßen;
    eine Vielzahl von Leckdetektoren (41a, 41b), die in unterschiedlichen Höhen in dem Kühllager (100) bereitgestellt sind und jeweils ausgelegt sind, um Kältemittel zu detektieren;
    eine Steuerung (50), die ausgelegt ist, um die Luftbeförderungsvorrichtung (31b, 32b) abhängig davon, ob einer aus der Vielzahl von Leckdetektoren (41a, 41b) Kältemittel detektiert, ob ein anderer aus der Vielzahl von Leckdetektoren (41a, 41b) Kältemittel detektiert, und von einem Zeitraum, während dessen Kältemittel von jedem aus der Vielzahl von Leckdetektoren (41a, 41b) detektiert wurde, zu steuern; und
    eine Kältekreislaufvorrichtung (10), die eine Außenbereichseinheit (21) und eine Innenbereichseinheit (22), die über ein Hochdruckrohr (24c) und ein Niederdruckrohr (24d) verbunden sind, ein Hochdruckrohr-Absperrventil (25a), das an dem Hochdruckrohr (24c) bereitgestellt ist, ein Niederdruckrohr-Absperrventil (25b), das an dem Niederdruckrohr (24d) bereitgestellt ist, umfasst,
    wobei die Vielzahl von Leckdetektoren (41a, 41b) einen ersten Leckdetektor (41a) umfasst, der an einer niedrigsten Position von Positionen der Vielzahl von Leckdetektoren (41a, 41b) bereitgestellt ist,
    wenn der erste Leckdetektor (41a) Kältemittel detektiert, die Steuerung (50) ausgelegt ist, um die Luftbeförderungsvorrichtung (31b, 32b) anzusteuern,
    die Vielzahl von Leckdetektoren (41a, 41b) einen zweiten Leckdetektor (41b) umfasst, der an einer höheren Position als der erste Leckdetektor (41a) bereitgestellt ist,
    wenn der erste Leckdetektor (41a) Kältemittel über einen Zeitraum detektiert hat, der länger als oder gleich einem ersten Zeitraum ist, oder wenn der zweite Leckdetektor (41b) Kältemittel detektiert, die Steuerung (50) ausgelegt ist, um das Hochdruckrohr-Absperrventil (25a) und das Niederdruck-Absperrventil (25b) zu schließen.
  2. Kältelager (100) nach Anspruch 1, wobei die Luftbeförderungsvorrichtung (31b, 32b) jeweils an der Einführungsöffnung (32) und der Ausstoßöffnung (31) bereitgestellt ist.
  3. Kühllager (100) nach Anspruch 1 oder 2, das außerdem Folgendes umfasst:
    eine Einführungsklappe (32a), die an der Einführungsöffnung (32) bereitgestellt ist, um die Einführungsöffnung (32) zu öffnen und zu schließen; und
    eine Ausstoßklappe (31a), die an der Ausstoßöffnung (31) bereitgestellt ist, um die Ausstoßöffnung (31) zu öffnen und zu schließen,
    wobei wenn ein zweiter Zeitraum kürzer als der erste Zeitraum ist und der zweite Leckdetektor (41b) Kältemittel innerhalb des zweiten Zeitraums detektiert, nachdem der erste Leckdetektor (41a) Kältemittel detektiert, oder wenn ein dritter Zeitraum länger als der erste Zeitraum ist und ein Zeitraum, der länger als oder gleich dem dritten Zeitraum ist, nach der Detektion von Kältemittel durch den ersten Leckdetektor (41a) vergeht, die Steuerung (50) ausgelegt ist, um die Ausstoßklappe (31a) und die Einführungsklappe (32a) zu öffnen.
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JP7340215B2 (ja) * 2017-11-28 2023-09-07 新星冷蔵工業株式会社 冷却システム
JP6869212B2 (ja) * 2018-08-31 2021-05-12 日立ジョンソンコントロールズ空調株式会社 空気調和機
JP2020051734A (ja) * 2018-09-28 2020-04-02 ダイキン工業株式会社 熱交換ユニット
JP2020204423A (ja) * 2019-06-14 2020-12-24 株式会社富岡電子工業 冷凍回路
JP2021085642A (ja) * 2019-11-29 2021-06-03 ダイキン工業株式会社 空気調和装置
JP7315845B2 (ja) * 2019-11-29 2023-07-27 ダイキン工業株式会社 空気調和装置
CN111999009A (zh) * 2020-08-05 2020-11-27 江苏精英冷暖设备工程有限公司 一种冷库制冷剂泄漏全覆盖自动检测系统
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JP3291407B2 (ja) 1995-01-31 2002-06-10 三洋電機株式会社 冷房装置
JPH1137619A (ja) * 1997-07-16 1999-02-12 Daikin Ind Ltd 自然冷媒を用いた空気調和装置
US6772598B1 (en) * 2002-05-16 2004-08-10 R.S. Services, Inc. Refrigerant leak detection system
JP2005016822A (ja) * 2003-06-25 2005-01-20 Toshiba Kyaria Kk 可燃性冷媒空気調和機の冷媒漏洩検知装置
JP2008249239A (ja) * 2007-03-30 2008-10-16 Mitsubishi Electric Corp 冷却装置の制御方法、冷却装置および冷蔵倉庫
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JP5761306B2 (ja) * 2013-11-06 2015-08-12 ダイキン工業株式会社 冷凍装置の熱源ユニット
EP3159633B1 (de) * 2014-06-19 2019-08-28 Mitsubishi Electric Corporation Innenraumeinheit für klimaanlage und klimaanlage mit dieser innenraumeinheit
WO2016079801A1 (ja) * 2014-11-18 2016-05-26 三菱電機株式会社 空気調和装置
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JP6689413B2 (ja) 2020-04-28

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