WO2018131085A1

WO2018131085A1 - Refrigerated warehouse

Info

Publication number: WO2018131085A1
Application number: PCT/JP2017/000593
Authority: WO
Inventors: 雄明岡部
Original assignee: 三菱電機株式会社
Priority date: 2017-01-11
Filing date: 2017-01-11
Publication date: 2018-07-19
Also published as: JP6689413B2; EP3569955A4; EP3569955B1; JPWO2018131085A1; EP3569955A1

Abstract

A refrigerated warehouse comprises: a warehouse body in which an inlet that introduces air from outside and an outlet that discharges air from inside are formed; a fan that introduces air from the outside into the warehouse and discharges air from inside the warehouse to the outside; a plurality of leak detectors that are provided at different height positions in the warehouse and that detect refrigerant; and a control device that controls the fan in accordance with the presence or absence of a leak detected by the leak detectors and the time for the leak detectors to detect refrigerant.

Description

Cooling warehouse

The present invention relates to a cooling warehouse that discharges the refrigerant leaked into the warehouse to the outside.

Conventionally, a prefabricated refrigerator or a prefabricated freezer is known as a cooling warehouse, and a person or a forklift can enter and exit the cooling warehouse. In addition, an indoor unit called a unit cooler constituting a refrigeration cycle apparatus using a refrigerant is arranged inside the cooling warehouse, and the inside of the cooling warehouse is cooled by the indoor unit. .

In the past, fluorocarbon refrigerants with low flammability and low toxicity have been frequently used as refrigerants for refrigeration cycle devices, but in recent years, GWP, that is, a refrigerant with a low global warming potential, has attracted attention from the viewpoint of global environmental conservation. In addition, products using fluorocarbon refrigerants containing a slightly flammable refrigerant are also increasing in refrigeration cycle devices in cooling warehouses.

In addition, since the casing of the cooling warehouse is composed of a heat insulating panel and the joint of the heat insulating panel is sealed, the airtightness of the cooling warehouse is extremely high. And since the specific gravity of the fluorocarbon-type refrigerant | coolant containing a slightly combustible refrigerant | coolant is higher than air, when a refrigerant | coolant leaks from an indoor unit, there exists a possibility that a refrigerant | coolant may stay inside a cooling warehouse.

Therefore, in a cooling device using a flammable refrigerant, a fan and a refrigerant sensor provided in the indoor unit are provided, and when the refrigerant leaked is detected by the refrigerant sensor, the fan is driven to rotate and the interior of the indoor unit is There has been proposed a cooling device that discharges refrigerant to the outside from an air supply / exhaust port communicating with the outside (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 8-200904

However, since the cooling device disclosed in Patent Document 1 detects the refrigerant only with the refrigerant sensor provided in one place of the indoor unit, the degree of refrigerant leakage cannot be determined. Therefore, even when the degree of refrigerant leakage is low, the cooling operation is stopped, and there is a problem that damage to the items that need cooling is expected.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a cooling warehouse capable of determining the degree of refrigerant leakage.

The cooling warehouse according to the present invention includes a warehouse body in which an introduction port for introducing outside air and a discharge port for discharging inside air are formed, and air outside the warehouse is introduced into the warehouse, and the air inside the warehouse is stored in the warehouse. A blower to be discharged to the outside, a plurality of leak detection units that are provided at different height positions in the cabinet, detect refrigerant, whether or not refrigerant is detected in each of the leak detection units, and detection of refrigerant in each of the leak detection units And a control device that controls the blower according to time.

According to the cooling warehouse according to the present invention, a plurality of leak detection units that are provided at different height positions in the store and detect refrigerant, whether or not each leak detection unit detects refrigerant, and each of the leak detection units And a control device that controls the blower according to the detection time of the refrigerant, so that the degree of refrigerant leakage can be determined.

It is sectional drawing which shows the cooling warehouse which concerns on embodiment of this invention. 1 is a circuit diagram showing a refrigeration cycle apparatus according to an embodiment of the present invention. It is a functional block diagram of the cooling warehouse which concerns on embodiment of this invention. It is a flowchart which shows the flow of the control processing of the control apparatus of the cooling warehouse which concerns on embodiment of this invention. It is a figure explaining the flow of the air at the time of the refrigerant | coolant leak in the cooling warehouse which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.

Embodiment.
FIG. 1 is a cross-sectional view showing a cooling warehouse 100 according to an embodiment of the present invention.
As shown in FIG. 1, the cooling warehouse 100 according to the present embodiment includes a warehouse body 1, an introduction lid 32a, an introduction fan 32b, a discharge lid 31a, a discharge fan 31b, an outdoor unit 21, and The indoor unit 22, a low-level leak detection unit 41 a, a high-level leak detection unit 41 b, and a control device 50 are provided. The refrigeration cycle apparatus 10 is provided in the cooling warehouse 100.

The warehouse body 1 is, for example, a box-shaped housing that constitutes the outer shell of the cooling warehouse 100, and the floor surface 1a, the wall surface 1b, and the ceiling surface 1c are each constituted by a heat insulating panel 1f. The warehouse body 1 has an introduction port 32 and a discharge port 31. Furthermore, an entrance (not shown) through which the person 2 or the luggage 3 enters and exits is formed, and a door 1e is provided at the entrance. The cooling warehouse 100 is, for example, a prefabricated refrigerator, and the joints of the heat insulating panels 1 f are sealed around the warehouse body 1. In the following, the inside of the warehouse body 1 is referred to as the inside of the warehouse, and the outside of the warehouse body 1 is referred to as the outside of the warehouse.

The introduction port 32 is an opening for introducing outside air into the warehouse, and is formed on the right wall surface 1b when viewed from the front, for example. The introduction port 32 is formed between, for example, a position that is 2/3 of the height of the warehouse body 1 and the ceiling surface 1c, that is, a position that is 2/3 or more of the height of the warehouse body 1. The introduction port 32 may be formed in the ceiling surface 1 c of the warehouse body 1.

Further, the discharge port 31 is an opening for discharging the internal air to the outside, and is formed, for example, in the left wall surface 1b when viewed from the front. The discharge port 31 is formed, for example, between the floor surface 1a and a position that is 1/3 of the height of the warehouse body 1, that is, a position that is 1/3 or less of the height of the warehouse body 1. The introduction port 32 may be formed in the floor surface 1a of the warehouse body 1.

The introduction lid 32 a is provided at the introduction port 32 and opens and closes the introduction port 32. The inlet blower 32b is provided in the chamber and in the vicinity of the inlet 32 and the inlet lid 32a. When the inlet lid 32a is open, air outside the chamber is introduced, and when the inlet lid 32a is closed, the air in the chamber is introduced. Is agitated. The discharge lid 31 a is provided at the discharge port 31 and opens and closes the discharge port 31. The outlet blower 31b is provided in the warehouse and in the vicinity of the outlet 31 and the discharge lid 31a. When the discharge lid 31a is open, the air in the warehouse is discharged, and when the discharge lid 31a is closed, the room air is discharged. Is agitated. In addition, the inlet blower 32b and the outlet blower 31b may be provided outside the warehouse instead of inside the warehouse.

Suppose that the outlet blower 31b and the inlet blower 32b each have the capability of generating an air volume that is equal to or greater than the ventilation volume multiplied by the ventilation frequency obtained by Equation 1.

[Equation 1]
Ventilation frequency n = 400 / internal volume V (m ³ )

Furthermore, each of the outlet blower 31b and the inlet blower 32b has a performance of generating a wind speed of 1.8 m / second or more.

This is because, when a flammable refrigerant is used in the refrigeration cycle apparatus 10, if the refrigerant leaks into the refrigerator, the refrigerant is stored in the refrigerator until it reaches a minimum concentration that allows the flame to propagate with the refrigerant and air mixed. The refrigerant must be agitated or ventilated before it stays inside, and the air volume and speed required for that purpose. The air volume and the air speed are values when a flammable refrigerant assumed at the present time is used in the refrigeration cycle apparatus 10.

The outdoor unit 21 is installed outside the warehouse, and for example, a compressor 11 and an outdoor heat exchanger 12 described later are installed inside the outdoor unit 21. The indoor unit 22 is installed in the warehouse, and an expansion unit 13 and an indoor heat exchanger 14, which will be described later, for example, are installed inside the indoor unit 22. Moreover, the indoor unit 22 is installed suspended from the ceiling surface 1c as shown in FIG. The indoor unit 22 may be installed on the floor or on the wall instead of being suspended from the ceiling. Furthermore, although two indoor units 22 are installed, the number of installed units may be one or three or more.

The low-level leak detection unit 41a and the high-level leak detection unit 41b are provided at different height positions in the warehouse, and detect refrigerant leaked into the warehouse. When the indoor unit 22 of the refrigeration cycle apparatus 10 is suspended from the ceiling, the low leak detector 41a is provided in a space between the floor surface 1a and a position 20 cm above the floor surface 1a, for example, in the warehouse. When the width or depth of the warehouse body 1 is 8 m or more, one or more low-order leak detection units 41a are provided within a horizontal distance of 8 m from the end of the indoor unit 22 of the refrigeration cycle apparatus 10. Further, when the indoor unit 22 of the refrigeration cycle apparatus 10 is placed on the floor, the low-level leak detection unit 41a is provided in a space between the floor surface 1a and a position of 5 cm above the floor surface 1a, for example, in the warehouse. It has been.

Moreover, the high level leak detection part 41b is provided in the space between the floor surface 1a and the position which becomes 1/3 of the height of the warehouse main body 1, for example in the warehouse.

When the specific gravity of the refrigerant is higher than that of air, the leaked refrigerant stays in the vicinity of the floor surface 1a in the warehouse, and stays above the floor surface 1a as the amount of leaked refrigerant increases. Therefore, as the leaked refrigerant flow rate increases, the time from when the low leak detection unit 41a detects the refrigerant to when the high leak detection unit 41b detects the refrigerant is shortened.

Therefore, in the cooling warehouse 100 according to the present embodiment, the presence or absence of refrigerant detection in the low leak detection unit 41a and the high leak detection unit 41b, and the refrigerant detection time of the low leak detection unit 41a and the high leak detection unit 41b, Alternatively, the degree of refrigerant leakage can be determined according to the time from when the refrigerant leaked by the low leak detector 41a is detected until the refrigerant leaked by the high leak detector 41b is detected. In addition, the detection time of a refrigerant | coolant here is the length of the time which has detected the refrigerant | coolant.

For example, when the flow rate of refrigerant leaked into the warehouse is considerably large, the low leak detection unit 41a and the high leak detection unit 41b detect the refrigerant leaked in a short time or simultaneously.

In the configuration described above, it is assumed that the specific gravity of the refrigerant is higher than the specific gravity of the air. However, when the specific gravity of the refrigerant is lower than the specific gravity of the air, the high-level leak detection unit 41b is It is provided in a space between the ceiling surface 1c and a position of 5 cm below the ceiling surface 1c. Further, when the specific gravity of the refrigerant is lower than the specific gravity of air, the lower leak detection unit 41a has a space between the position that is 2/3 of the height of the warehouse body 1 and the ceiling surface 1c, that is, the warehouse body 1 It is provided in a space that is 2/3 or more of the height.

The control device 50 is, for example, a dedicated hardware or a CPU (Central processing unit, central processing device, processing device, arithmetic device, microprocessor, which executes a program stored in the storage unit 52 (see FIG. 3 described later). (Also called a microcomputer or a processor). Further, the control device 50 controls the outlet blower 31b, the inlet blower 32b, and the like according to the detection results of the low leak detection unit 41a and the high leak detection unit 41b.

FIG. 2 is a circuit diagram showing the refrigeration cycle apparatus 10 according to the embodiment of the present invention.
As shown in FIG. 2, the refrigeration cycle apparatus 10 according to the present embodiment includes, for example, a compressor 11, an outdoor heat exchanger 12, an expansion unit 13, and an indoor heat exchanger 14 connected by a pipe 24, and refrigerant is It has a circulating refrigerant circuit. The refrigeration cycle apparatus 10 includes an outdoor unit 21 and an indoor unit 22, and the outdoor unit 21 and the indoor unit 22 are connected by a pipe 24.

As shown in FIG. 1, the piping 24 includes an outside piping 24 a located outside the warehouse from the outdoor unit 21 to the warehouse body 1, and an inside piping 24 b located inside the warehouse from the warehouse body 1 to the indoor unit 22. It consists of As shown in FIG. 2, each of the external piping 24 a and the internal piping 24 b includes a high-pressure piping 24 c from the outdoor unit 21 to the indoor unit 22 and a low-pressure piping 24 d that returns from the indoor unit 22 to the outdoor unit 21. Yes. The high-pressure pipe 24c is provided with a high-pressure pipe cutoff valve 25a, and the low-pressure pipe 24d is provided with a low-pressure pipe cutoff valve 25b.

It should be noted that the high-pressure pipe shut-off valve 25a and the low-pressure pipe shut-off valve 25b that are opened and closed at an arbitrary timing by the control device 50 may be replaced with electromagnetic valves that open only when energized and close when not energized.

Compressor 11 compresses the refrigerant. The outdoor heat exchanger 12 exchanges heat between the outside air and the refrigerant to condense the refrigerant. The expansion part 13 expands and depressurizes the refrigerant. The indoor heat exchanger 14 evaporates the refrigerant by exchanging heat between the indoor air and the refrigerant.

Note that the refrigerant used in the refrigeration cycle apparatus 10 is, for example, a slightly flammable refrigerant.

Next, the operation of the cooling operation of the refrigeration cycle apparatus 10 according to the present embodiment will be described.
The refrigerant is sucked into the compressor 11 of the outdoor unit 21, compressed by the compressor 11, and discharged in the state of high-temperature and high-pressure gas. The discharged refrigerant flows into the outdoor heat exchanger 12. The refrigerant that has flowed into the outdoor heat exchanger 12 is condensed by exchanging heat with outdoor air. The condensed refrigerant flows into the expansion unit 13 of each indoor unit 22 and is expanded and depressurized by the expansion unit 13. The expanded and depressurized refrigerant flows into the indoor heat exchanger 14. The refrigerant that has flowed into the indoor heat exchanger 14 is heat-exchanged with the indoor air and evaporated. At that time, the internal air is cooled to cool the interior. Thereafter, the evaporated refrigerant is sucked into the compressor 11.

In addition, the flow path switching device may be provided in the refrigeration cycle apparatus 10, and it becomes possible to perform the heating operation by switching the flow path switching device by providing the flow path switching device.

FIG. 3 is a functional block diagram of the cooling warehouse 100 according to the embodiment of the present invention.
As illustrated in FIG. 3, the control device 50 includes a measurement unit 51, a storage unit 52, a determination unit 53, and a drive unit 54. The control device 50 is configured to receive signals from the low leak detection unit 41a and the high leak detection unit 41b. Further, a signal is output to the compressor 11, the high-pressure pipe shutoff valve 25a, the low-pressure pipe shutoff valve 25b, the discharge lid 31a, the discharge port blower 31b, the introduction lid 32a, the introduction port blower 32b, and the notification means 43. Yes. Note that the notification means 43 is, for example, an audio output means such as a speaker, a display means such as an LED, a contact with a remote centralized control panel or control device, or all of them.

The measurement unit 51 acquires signals detected by the low-level leakage detection unit 41a and the high-level leakage detection unit 41b. The storage unit 52 stores various information. The determination unit 53 performs various determinations based on the signal acquired by the measurement unit 51 and information stored in the storage unit 52. For example, the reference value is stored in the storage unit 52, and the determination unit 53 is more than the reference value stored in the storage unit 52 when the value of the signal acquired by the measurement unit 51 from the lower leakage detection unit 41a is greater than the reference value. The lower leakage detection unit 41a determines that the refrigerant has been detected. Based on the determination result of the determination unit 53, the drive unit 54 includes the compressor 11, the high-pressure pipe cutoff valve 25a, the low-pressure pipe cutoff valve 25b, the discharge lid 31a, the discharge port blower 31b, the introduction lid 32a, the introduction port blower 32b, and A drive signal is output to the notification means 43 to drive them.

FIG. 4 is a flowchart showing the flow of control processing of the control device 50 of the cooling warehouse 100 according to the embodiment of the present invention.
Hereinafter, the control processing of the control device 50 according to the present embodiment will be described with reference to FIG.
The control device 50 according to the present embodiment includes the presence / absence of refrigerant detection in the low-level leak detection unit 41a and the high-level leak detection unit 41b, the detection time of the refrigerant in the low-level leak detection unit 41a and the high-level leak detection unit 41b, or the low level The degree of refrigerant leakage is determined according to the time from detection of the refrigerant leaked by the leak detection unit 41a to the detection of the refrigerant leaked by the high-level leak detection unit 41b, and retention of the refrigerant leaked depending on the degree of refrigerant leakage The control which suppresses is performed.

Here, the relationship between the first time, the second time, and the third time, which will be described later, is second time <first time <third time, and is stored in the storage unit 52, respectively. Note that the first time, the second time, and the third time are predetermined lengths of time. In addition, the first time, the second time, and the third time are determined by the refrigerant type of the refrigeration cycle apparatus 10 and the internal volume of the cooling warehouse 100. However, the first time, the second time, and the third time are short for a strong flammable refrigerant and short for a low flammable refrigerant. Can be set longer.

After starting the cooling operation, the determination unit 53 of the control device 50 determines whether the low-level leakage detection unit 41a has detected the refrigerant based on the signal input from the low-level leakage detection unit 41a to the measurement unit 51 (step) S1).

When the determination unit 53 of the control device 50 determines that the low leak detection unit 41a has not detected the refrigerant (No in Step S1), the normal cooling operation is continued (Step S8).
On the other hand, when the determination unit 53 of the control device 50 determines that the low leak detection unit 41a has detected the refrigerant (Yes in step S1), the drive unit 54 of the control device 50 operates the notification unit 43 to externally The administrator is informed that a refrigerant leak has occurred in the warehouse, and the inlet fan 32b and the outlet fan 31b are driven to stir the refrigerant that has leaked into the warehouse, and the compressor 11 is continuously driven. The operation of the cycle device 10 is continued (step S2), that is, the cooling operation is continued and the process proceeds to step S3.

In step S3, the determination unit 53 of the control device 50 determines that the low-level leak detection unit 41a and the high-level leak detection unit 41b are refrigerants based on the signals input to the measurement unit 51 from the low-level leak detection unit 41a and the high-level leak detection unit 41b. Whether or not is detected.

When the determination unit 53 of the control device 50 determines that the low-level leakage detection unit 41a has not detected the refrigerant for the first time or more, and determines that the high-level leakage detection unit 41b has not detected the refrigerant (step S3). No), the drive unit 54 of the control device 50 operates the notification means 43 to notify an external administrator, and the external administrator is allowed to move the contents in the warehouse and repair the leakage point of the refrigerant. Prompt (step S7).

On the other hand, when the determination unit 53 of the control device 50 determines that the low-level leakage detection unit 41a has detected the refrigerant for the first time or more, or determines that the high-level leakage detection unit 41b has detected the refrigerant (Yes in step S3). The drive unit 54 of the control device 50 closes the high-pressure pipe shutoff valve 25a and the low-pressure pipe shutoff valve 25b, stops driving the compressor 11, and stops the operation of the refrigeration cycle apparatus 10, that is, stops the cooling operation. Furthermore, after notifying the outside manager to the outside manager by operating the notification means 43 (step S4), the process proceeds to step S5.

In step S5, the determination unit 53 of the control device 50 determines that the low-level leak detection unit 41a and the high-level leak detection unit 41b are refrigerants based on the signals input to the measurement unit 51 from the low-level leak detection unit 41a and the high-level leak detection unit 41b. Whether or not is detected.

The determination unit 53 of the control device 50 determines that the high-level leak detection unit 41b has not detected the refrigerant within the second time after the low-level leak detection unit 41a detects the refrigerant, and the low-level leak detection unit 41a When it is determined that the third time or more has not elapsed since the refrigerant was detected (No in step S5), the drive unit 54 of the control device 50 operates the notification means 43 to the external manager. Notification is made so as to encourage the movement of the contents and the repair of the leakage point of the refrigerant (step S7).

On the other hand, the determination unit 53 of the control device 50 determines that the high-level leak detection unit 41b has detected the refrigerant within the second time after the low-level leak detection unit 41a detects the refrigerant, or the low-level leak detection unit 41a detects the refrigerant. When it is determined that the third time or more has elapsed since the detection of the error (Yes in step S5), the drive unit 54 of the control device 50 operates the notification means 43 to increase the temperature inside the cabinet to the external manager. The discharge lid 31a and the introduction lid 32a are opened, and the discharge port 31 and the introduction port 32 are opened (step S6).

In the case of the cooling warehouse 100 provided with the refrigeration cycle apparatus 10 using the combustible refrigerant by the control processing as described above, the refrigerant staying in the warehouse before reaching the combustion concentration is agitated. Can be suppressed. In addition, the outside manager can carry out repair of the leaked portion of the refrigerant after moving the contents in the warehouse by notifying the notification means 43, and minimize damage to the contents in the warehouse. Can be suppressed.

As described above, according to the cooling warehouse 100 according to the present embodiment, the control device 50 includes the low-level leak detection unit 41a and the high-level leak detection unit 41b that are a plurality of leak detection units provided within an appropriate range from the refrigerant leak location. The presence or absence of refrigerant detection, the refrigerant detection time of the low-level leak detection unit 41a and the high-level leak detection unit 41b, or the refrigerant leaked by the high-level leak detection unit 41b after detecting the refrigerant leaked by the low level leak detection unit 41a The degree of refrigerant leakage can be determined according to the time until detection, that is, the refrigerant detection timing. And by performing each of the above-mentioned controls according to the degree of refrigerant leakage, it is possible to suppress the retention of the refrigerant in the warehouse and notify the external manager, so that the occurrence of fire and the contents in the warehouse are suppressed. It is possible to achieve both the minimization of damage.

Specifically, the control device 50 drives the inlet fan 32b and the outlet fan 31b when the low leak detector 41a detects a refrigerant. In other words, when the degree of refrigerant leakage is low, the refrigerant that has leaked into the cabinet is agitated while continuing the cooling operation, so that stagnation of the refrigerant in the cabinet is suppressed and damage to the items that require cooling is suppressed. can do.

Further, the control device 50 closes the high pressure pipe shutoff valve 25a and the low pressure pipe shutoff valve 25b when the low leak detection unit 41a detects the refrigerant for the first time or more, or when the high leak detection unit 41b detects the refrigerant. . In other words, when the degree of refrigerant leakage is medium, the cooling operation is stopped to prevent refrigerant leakage, and the outside administrator can move the contents in the cabinet and repair the refrigerant leakage point. Can be urged.

In addition, the control device 50 detects when the high-level leak detection unit 41b detects the refrigerant within the second time after the low-level leak detection unit 41a detects the refrigerant, or after the low-level leak detection unit 41a detects the refrigerant. When more than the third time has elapsed, the discharge lid 31a and the introduction lid 32a are opened. In other words, when the degree of refrigerant leakage is high, the refrigerant leaking into the warehouse is discharged out of the warehouse, so that the retention of the refrigerant in the warehouse can be more reliably suppressed.

In addition, the high-pressure pipe shut-off valve 25a and the low-pressure pipe shut-off valve 25b can be replaced with electromagnetic valves that are opened only when energized, so that refrigerant leakage into the cabinet can be shut off reliably even in the event of an emergency such as a power failure. The occurrence of fire can be suppressed.

As described above, the discharge port 31 is formed between the floor surface 1a and a position that is 1/3 of the height of the warehouse body 1, that is, a position that is 1/3 or less of the height of the warehouse body 1. Yes. Further, the introduction port 32 is formed between a position that is 2/3 of the height of the warehouse body 1 and the ceiling surface 1c, that is, a position that is 2/3 or more of the height of the warehouse body 1.

FIG. 5 is a diagram for explaining the air flow when the refrigerant leaks in the cooling warehouse 100 according to the embodiment of the present invention.
Since the discharge port 31 and the introduction port 32 are formed at the above-described positions, the outside air introduced into the warehouse from the introduction port 32 through the introduction path 71 as shown in FIG. Then, together with the refrigerant 6 having a higher specific gravity than the air staying in the vicinity of the floor surface 1a, the refrigerant is discharged from the discharge port 31 to the outside through the discharge path 72. Therefore, the refrigerant 6 having a specific gravity higher than that of air can be effectively discharged outside the warehouse. That is, the refrigerant 6 having a specific gravity higher than that of air can be easily and quickly discharged outside the warehouse. Furthermore, ventilation can be completed in a short time by setting the air volume of the outlet blower 31b and the inlet blower 32b to the air volume obtained by the above formula 1.

1 warehouse body, 1a floor surface, 1b wall surface, 1c ceiling surface, 1e door, 1f heat insulation panel, 2 persons, 3 luggage, 6 refrigerant with higher specific gravity than 10 air, 10 refrigeration cycle equipment, 11 compressor, 12 outdoor heat exchanger , 13 expansion section, 14 indoor heat exchanger, 21 outdoor unit, 22 indoor unit, 24 piping, 24a external piping, 24b internal piping, 24c high pressure piping, 24d low pressure piping, 25a high pressure piping cutoff valve, 25b low pressure piping cutoff Valve, 31 outlet, 31a outlet lid, 31b outlet fan, 32 inlet, 32a inlet lid, 32b inlet fan, 41a low leak detector, 41b high leak detector, 43 notification means, 50 control device, 51 measurement Section, 52 storage section, 53 determination section, 54 drive section, 71 introduction path, 72 discharge path, 100 cooling warehouse .

Claims

A warehouse body in which an inlet for introducing outside air and an outlet for discharging air inside the warehouse are formed,
A blower that introduces air outside the chamber into the chamber and discharges the air inside the chamber to the outside;
A plurality of leakage detectors that are provided at different height positions in the chamber and detect refrigerant;
A cooling warehouse comprising: a control device that controls the blower in accordance with the presence or absence of refrigerant detection in each of the leakage detection units and the detection time of the refrigerant in each of the leakage detection units.
The cooling warehouse according to claim 1, wherein the blower is provided on the inlet side and the outlet side.
The control device includes:
When the low leak detection unit that is the leak detection unit provided at the lowest position detects the refrigerant,
The cooling warehouse according to claim 1 or 2, wherein the blower is driven.
An outdoor unit and an indoor unit connected by a high-pressure pipe and a low-pressure pipe, the high-pressure pipe is provided with a high-pressure pipe shut-off valve, and the low-pressure pipe is provided with a low-pressure pipe shut-off valve,
The control device includes:
When the low leak detection unit detects the refrigerant for a first time or more, or when the high leak detection unit provided at a position higher than the low leak detection unit detects the refrigerant,
The cooling warehouse according to claim 3, wherein the high-pressure pipe cutoff valve and the low-pressure pipe cutoff valve are closed.
An introduction lid provided at the introduction port for opening and closing the introduction port;
A discharge lid provided at the discharge port for opening and closing the discharge port;
The control device includes:
When the high leak detection unit detects the refrigerant within the second time which is shorter than the first time after the low leak detection unit detects the refrigerant, or the low leak detection unit detects the refrigerant. 5. The cooling warehouse according to claim 4, wherein the discharge lid and the introduction lid are opened when at least a third time that is longer than the first time elapses.