Temperature and humidity control library

Abstract

To provide a temperature and humidity adjustment chamber which makes it possible to appropriately adjust temperature and humidity in a storage chamber of the temperature and humidity adjustment chamber.SOLUTION: In a temperature and humidity adjustment chamber 10, a control device 50 can execute compressor low speed operation control to control a compressor 31 in a state where the compressor is caused to operate continuously with low speed operation which is set to be a rotational speed lower than the rated rotational speed when a temperature and humidity management program is executed, and under the compressor low speed operation control, performs control such that the compressor 31 is caused to operate at the rotational speed faster than the low speed operation to cool the inside of a storage chamber 20 when the temperature detected by a temperature sensor 27 is equal to or greater than an upper limit value of the setting temperature, and performs control such that the compressor 31 is caused to operate at the rotational speed faster than the low speed operation to perform dehumidification when the detected humidity by a humidity sensor 28 is equal to or higher than an upper limit value of the setting humidity.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a temperature and humidity regulating chamber such as a dough conditioner in which bread dough is aged, fermented, etc. under regulated temperature and humidity conditions before being baked. [Background technology]

[0002] Patent Document 1 discloses an invention for a dough conditioner (temperature and humidity regulating cabinet) that ages and ferments bread dough at regulated temperature and humidity before baking. This dough conditioner includes a storage cabinet for storing items such as dough, a circulation fan for circulating air within the storage cabinet, a refrigeration unit for dehumidifying and cooling the storage cabinet, a heater for heating the storage cabinet, a humidifier for humidifying the storage cabinet, a temperature sensor for detecting the temperature within the storage cabinet, a humidity sensor for detecting the humidity within the storage cabinet, and a control device for controlling the operation of the refrigeration unit, heater, and humidifier. The dough conditioner's control device has a dough fermentation program that regulates the temperature and humidity within the storage cabinet to temperatures and humidity appropriate for the dough from freezing to fermentation, and controls the operation of the refrigeration unit, heater, and humidifier based on the temperature detected by the temperature sensor and the humidity detected by the humidity sensor to regulate the temperature and humidity within the storage cabinet to temperatures and humidity appropriate for the dough from freezing to fermentation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-83694 Summary of the Invention [Problem to be solved by the invention]

[0004] When the dough conditioner of Patent Document 1 runs a fermentation program, the inside of the storage compartment is humidified when water is sprayed from the spray nozzle of the humidifier, cooled and dehumidified when the freezing device is operated, and heated when the heater is operated. The freezing device includes a compressor that pressurizes a refrigerant, a condenser that cools and liquefies the refrigerant pressurized by the compressor, a capillary tube that expands the liquefied refrigerant liquefied by the condenser, and an evaporator that cools and dehumidifies the inside of the storage compartment by the heat of vaporization when the expanded liquefied refrigerant is vaporized. When the compressor of the freezing device is operated, the circulating refrigerant vaporizes as it passes through the evaporator, thereby cooling and dehumidifying the inside of the storage compartment.

[0005] The compressor of a refrigeration unit is generally set with minimum operating and stopping times to prevent short-term on / off switching. When cooling and dehumidifying the interior of a storage cabinet, for example, after the temperature inside the storage cabinet reaches the lower limit of the set temperature and the compressor stops operating, the humidity inside the storage cabinet may reach the upper limit of the set humidity before the minimum stop time has elapsed. This prevents the compressor from operating until the minimum stop time has elapsed, making it impossible to properly regulate the temperature and humidity inside the storage cabinet. The present invention aims to enable the proper regulation of the temperature and humidity inside a temperature and humidity controlled storage cabinet. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a temperature and humidity regulated cabinet comprising a cabinet for storing items, a circulation fan for circulating air within the cabinet, a refrigeration unit for dehumidifying and cooling the interior of the cabinet, a heater for heating the interior of the cabinet, a humidifier for humidifying the interior of the cabinet, a temperature sensor for detecting the temperature within the cabinet, a humidity sensor for detecting the humidity within the cabinet, and a control unit for controlling the operation of the refrigeration unit, the heater, and the humidifier, wherein the control unit has a temperature and humidity management program for controlling the operation of the refrigeration unit, the heater, and the humidifier based on the temperature detected by the temperature sensor and the humidity detected by the humidity sensor so that the temperature and humidity within the cabinet become preset set temperatures and set humidity, and the refrigeration unit comprises a compressor for compressing and feeding refrigerant, a condenser for cooling and liquefying the refrigerant compressed by the compressor, expansion means for expanding the liquefied refrigerant liquefied by the condenser, and an expansion unit for expanding the liquefied refrigerant. and an evaporator that cools and dehumidifies the inside of the storage compartment by the heat of vaporization when the expanded liquefied refrigerant is vaporized, and the compressor is capable of changing its rotation speed so as to change the amount of refrigerant sent out. The control device is capable of executing compressor low-speed operation control that controls the compressor to be continuously operated at a low-speed operation set at a rotation speed lower than the rated rotation speed when executing a temperature and humidity management program, and when a temperature detected by a temperature sensor under compressor low-speed operation control becomes equal to or higher than an upper limit value of a set temperature, controls the compressor to operate at a rotation speed faster than the low-speed operation to cool the inside of the storage compartment, and controls the compressor to operate at a rotation speed faster than the low-speed operation to dehumidify the inside of the storage compartment when a humidity detected by a humidity sensor becomes equal to or higher than an upper limit value of a set humidity, and the low-speed operation of the compressor is set to a first low-speed operation and a second low-speed operation having a rotation speed faster than the first low-speed operation. a condenser temperature sensor for detecting the temperature around the condenser; The control device provides a temperature and humidity regulated cabinet characterized by operating the compressor at a first low speed when the temperature detected by the condenser temperature sensor is lower than an upper limit set value that is set for the purpose of protecting the compressor, and operating the compressor at a second low speed when the temperature detected by the condenser temperature sensor is equal to or higher than the upper limit set value, and controlling the amount of humidification by the humidifier to be increased.

[0007] In the temperature and humidity controlled cabinet configured as described above, the refrigeration device comprises a compressor that pressurizes and sends out a refrigerant, a condenser that cools and liquefies the refrigerant pressurized by the compressor, an expansion means that expands the liquefied refrigerant liquefied by the condenser, and an evaporator that cools and dehumidifies the inside of the cabinet by the heat of vaporization when the expanded liquefied refrigerant is vaporized, and the rotation speed of the compressor can be changed to change the amount of refrigerant sent out. a condenser temperature sensor for detecting the temperature around the condenser; When the temperature and humidity management program is being executed, the control device is capable of executing compressor low-speed operation control, which controls the compressor to operate continuously at a low-speed operation set at a rotation speed lower than the rated rotation speed, and when the temperature detected by the temperature sensor under compressor low-speed operation control exceeds the upper limit of the set temperature, the control device controls the compressor to operate at a rotation speed faster than the low-speed operation to cool the storage room, and when the humidity detected by the humidity sensor exceeds the upper limit of the set humidity, the control device controls the compressor to operate at a rotation speed faster than the low-speed operation to dehumidify.

[0008] When the control device is executing the temperature and humidity control program, the compressor low speed operation control is executed, so that the compressor of the refrigeration device is controlled to be continuously operated at a low speed set at a rotation speed lower than the rated rotation speed. The detected temperature is When the temperature exceeds the upper limit of the set temperature, the compressor is controlled to operate at a rotation speed faster than the low-speed operation to cool the inside of the storage cabinet, and when the humidity detected by the humidity sensor exceeds the upper limit of the set humidity, the compressor is controlled to operate at a rotation speed faster than the low-speed operation to dehumidify. In this way, when regulating the temperature and humidity inside the storage cabinet, the compressor is maintained in continuous operation, although the rotation speed changes between operating at the low-speed operation and operating at a rotation speed faster than the low-speed operation. This makes it possible to appropriately cool and dehumidify the inside of the storage cabinet even when minimum operating and stop times are set to protect the compressor.

[0009] Also,The low-speed operation of the compressor is set to a first low-speed operation and a second low-speed operation having a rotation speed faster than the first low-speed operation, and the control device operates the compressor at the first low-speed operation when the temperature detected by the condenser temperature sensor is lower than an upper limit setting value set for the purpose of protecting the compressor, and operates the compressor at the second low-speed operation when the temperature detected by the condenser temperature sensor is equal to or higher than the upper limit setting value, and controls the humidification amount by the humidifier to be increased. is doing When the temperature around the condenser is high, it may not be possible to operate the compressor at a slower speed in order to protect the compressor. When the temperature around the condenser exceeds the upper limit set for protecting the compressor, the compressor can be operated at a second low speed, which has a faster rotation speed, even at low speed, to make the compressor less likely to break down. In this case, if the compressor is operated at the second low speed, which has a faster rotation speed than the first low speed, the humidity inside the storage compartment is likely to be lower than when the compressor is operated at the first low speed. However, since the amount of humidification by the humidifier is controlled to be increased, the storage compartment can be humidified responsively.

[0010] In a temperature and humidity controlled cabinet configured as described above, the control device preferably controls the compressor so that it does not execute low-speed operation control when the set temperature is equal to or higher than a low-frequency cooling temperature, which is set as a temperature at which the frequency of cooling within the cabinet is low, and controls the compressor so that it executes low-speed operation control when the set temperature is lower than the low-frequency cooling temperature. When the set temperature within the cabinet is low, the refrigeration unit cools the cabinet interior frequently, whereas when the set temperature within the cabinet is high, the refrigeration unit cools the cabinet interior less frequently, and the timing of dehumidification by the refrigeration unit is less affected by the timing of cooling. Therefore, by controlling the compressor so that it does not execute low-speed operation control when the set temperature is equal to or higher than the low-frequency cooling temperature, which is set as a temperature at which the frequency of cooling within the cabinet is low, unnecessary cooling and dehumidification within the cabinet can be avoided.

[0011] In a temperature and humidity controlled cabinet configured as described above, the control device preferably controls the compressor so that it does not execute low-speed operation control when the set humidity is equal to or higher than a low-dehumidification-frequency humidity set as a humidity level at which dehumidification within the cabinet is performed with low frequency, and controls the compressor so that it executes low-speed operation control when the set humidity is lower than the low-dehumidification-frequency humidity. When the set humidity within the cabinet is low, the refrigeration unit dehumidifies the cabinet with high frequency, whereas when the set humidity within the cabinet is high, the refrigeration unit dehumidifies the cabinet with low frequency, and the timing of cooling by the refrigeration unit is less affected by the timing of dehumidification. Therefore, by controlling the compressor so that it does not execute low-speed operation control when the set humidity is equal to or higher than a low-dehumidification-frequency humidity set as a humidity level at which dehumidification within the cabinet is performed with low frequency, unnecessary cooling and dehumidification within the cabinet can be avoided.

[0012] In a temperature and humidity controlled cabinet configured as described above, the control device preferably controls the compressor so as not to execute low-speed operation control when the set temperature is equal to or higher than a low-cooling frequency temperature set as a temperature at which the storage compartment is cooled less frequently and the set humidity is equal to or higher than a low-dehumidification frequency humidity set as a humidity at which the storage compartment is dehumidified less frequently. When the set temperature in the storage compartment is low, the storage compartment is cooled more frequently by the refrigeration device, whereas when the set temperature in the storage compartment is high, the storage compartment is cooled less frequently by the refrigeration device, so that the timing of dehumidification by the refrigeration device is less affected by the timing of cooling. When the set humidity in the storage compartment is low, the storage compartment is dehumidified more frequently by the refrigeration device, whereas when the set humidity in the storage compartment is high, the storage compartment is dehumidified less frequently by the refrigeration device, so that the timing of cooling by the refrigeration device is less affected by the timing of dehumidification. Therefore, by controlling the compressor low-speed operation control not to be executed when the set temperature is equal to or higher than the low-frequency cooling temperature set as the temperature at which cooling in the storage compartment is performed with low frequency and the set humidity is equal to or higher than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage compartment is performed with low frequency, it is possible to prevent unnecessary cooling and dehumidification in the storage compartment. [Brief explanation of the drawings]

[0013] [Figure 1]FIG. 2 is a front view of the temperature and humidity control cabinet. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 3 is a cross-sectional view of FIG. 2 taken along line B-B. [Figure 4] 3 is a cross-sectional view taken along CC in FIG. 2. [Figure 5] This is a schematic diagram of a mechanism for regulating temperature and humidity inside the storage facility. [Figure 6] FIG. 2 is a block diagram showing a control device. [Figure 7] 1 is a flowchart showing a fermentation program. [Figure 8] This is a flowchart for adjusting the temperature inside the storage facility when performing a freeze (freezing) process, a retard (refrigeration) process, a preheating process, and a proofing (fermentation) process when compressor low-speed operation control is not performed. [Figure 9] 10 is a flowchart showing the humidity control in the storage cabinet when a preheating process and a proofing (fermentation) process are performed without executing the compressor low speed operation control. [Figure 10] 10 is a flowchart for adjusting the temperature inside the storage cabinet when a proofing (fermentation) process is performed under low-speed compressor operation control. [Figure 11] 10 is a flowchart for adjusting the humidity inside the storage cabinet when a proofing (fermentation) process is performed under low-speed compressor operation control. BEST MODE FOR CARRYING OUT THE INVENTION

[0014] An embodiment of a temperature and humidity control chamber of the present invention will be described below with reference to the accompanying drawings. The temperature and humidity control chamber 10 of the present invention is called a dough conditioner, and performs the processes of freezing, retarding, preheating, and proofing in order before baking bread dough. The temperature and humidity control chamber 10 performs temperature control appropriate for each of the above processes, and also performs humidity control in addition to temperature control during the preheating and proofing processes.

[0015] As shown in Figures 1 and 2, the temperature and humidity regulated cabinet 10 has a machine chamber 12 at the top of the housing 11, and two storage cabinets 20 for storing dough (storage items) on an upper and lower level in the area excluding the upper machine chamber 12. The upper and lower storage cabinets 20 have substantially the same structure, so the following explanation will only cover the upper storage cabinet 20. As shown in Figure 2, a front opening 20a is formed in the front of the storage cabinet 20 for inserting and removing trays containing dough, and a door 21 is provided in the front of the storage cabinet 20 to open and close the front opening 20a.

[0016] 2 and 3, a partition plate 22 is provided at the rear (one side) of storage cabinet 20, and partition plate 22 divides the entire storage cabinet 20 except for the rear portion into a storage space 23 for storing items made of bread dough, and a temperature and humidity regulating passage 24 for sending temperature- and humidity-regulated air to storage space 23 in a manner that allows ventilation. Partition plate 22 is attached at a distance from the ceiling wall and bottom wall of storage cabinet 20, and an intake port 22a is formed at the top of partition plate 22 between it and the ceiling wall of storage cabinet 20, and an outlet port 22b is formed at the bottom of partition plate 22 between it and the bottom wall of storage cabinet 20.

[0017] 2, 4, and 5, the temperature and humidity adjustment passage 24 of the storage cabinet 20 is a passage (space) for adjusting the temperature and humidity inside the storage cabinet 20. A circulation fan 25 is provided above the temperature and humidity adjustment passage 24, and the circulation fan 25 circulates the air inside the storage cabinet 20 between the storage space 23 and the temperature and humidity adjustment passage 24. When the circulation fan 25 is operated, the air inside the storage space 23 of the storage cabinet 20 is sucked into the temperature and humidity adjustment passage 24 through the intake port 22a, and the air in the temperature and humidity adjustment passage 24 sucked in through the intake port 22a flows downward and is sent out into the storage space 23 of the storage cabinet 20 through the outlet port 22b, and the air inside the storage cabinet 20 circulates so as to pass through the temperature and humidity adjustment passage 24.

[0018] 2, 4, and 5, an evaporator 35 of a refrigeration device 30 for cooling the inside of the storage cabinet 20 is disposed below the circulation fan 25 above the temperature and humidity adjustment passage 24. As shown in Fig. 5, the refrigeration device 30 cools and dehumidifies the air inside the storage cabinet 20 that passes through the temperature and humidity adjustment passage 24, thereby cooling and dehumidifying the inside of the storage cabinet 20. The refrigeration device 30 uses a well-known refrigerant circuit and includes a compressor 31 that compresses the refrigerant, a condenser 32 that cools the compressed refrigerant gas, a dryer 33 that removes moisture contained in the liquefied refrigerant, a capillary tube (expansion means) 34 that expands the liquefied refrigerant, and an evaporator 35 that vaporizes the expanded liquefied refrigerant to cool the inside of the storage cabinet 20.

[0019] The compressor 31 incorporates an inverter-type electric motor, and the amount of refrigerant delivered per unit time can be changed by changing the rotational speed (number of revolutions) of the electric motor. The compressor 31 has five adjustable rotational speeds: rated rotational speed (100%), 80% of the rated rotational speed, 60% of the rated rotational speed, 40% of the rated rotational speed, and 20% of the rated rotational speed. This allows the amount of refrigerant delivered per unit time to be varied in five steps (100-20%). The compressor 31 may also have an electric motor whose rotational speed can be adjusted continuously. The compressor 31 has minimum operating and stop times set to prevent rapid on / off cycles. In this embodiment, the minimum operating time of the compressor 31 is set to three minutes, and the minimum stop time is set to five minutes.

[0020] The condenser 32 cools and liquefies the refrigerant pressure-fed from the compressor 31. A condenser temperature sensor 32a for detecting the temperature of the refrigerant is provided at the refrigerant outlet of the condenser 32 (around the condenser 32), and the condenser temperature sensor 32a detects the temperature of the refrigerant cooled and liquefied by the condenser 32. The evaporator 35 is disposed above the temperature and humidity control passage 24, and other components are disposed in the machine room 12. In this refrigeration device 30, the refrigerant gas compressed by the compressor 31 is cooled in the condenser 32 to become a liquefied refrigerant. The liquefied refrigerant passes through the dryer 33, expands in the capillary tube 34, and is sent to the evaporator 35. When vaporized in the evaporator 35, it cools the air in the temperature and humidity control passage 24. Although the capillary tube 34 is used as the expansion means, the expansion means is not limited to this, and an expansion valve such as an electronic expansion valve may also be used.

[0021] 2, 4, and 5, a heater 26 for heating the inside of the storage cabinet 20 is disposed below the evaporator 35 in the temperature and humidity adjustment passage 24 of the storage cabinet 20. The heater 26 heats the air inside the storage cabinet 20 that passes through the temperature and humidity adjustment passage 24, thereby heating the inside of the storage cabinet 20. The heater 26 uses a glass tube heater, and not only can it efficiently heat the air inside the temperature and humidity adjustment passage 24 by radiant heat, but it also functions as a heater for defrosting the evaporator 35 disposed above.

[0022] As shown in FIGS. 4 and 5, a humidifier nozzle 41 of a humidifier 40 is disposed below the heater 26 in the temperature and humidity control passage 24 of the storage cabinet 20. The humidifier 40 sprays water to humidify the interior of the storage cabinet 20. In this embodiment, the humidifier 40 sprays mist-like water mixed with air. As shown in FIG. 5, the humidifier 40 includes the humidifier nozzle 41 that sprays mist-like water, a water supply pipe 42 that supplies water to the humidifier nozzle 41 from a water supply source such as a tap, an air supply pipe 43 that supplies air to the humidifier nozzle 41, and an air compressor 44 that sends pressurized air to the spray nozzle via the air supply pipe 43. The water supply pipe 42 is connected to a water supply source such as a tap, and is fitted with a pressure reducing valve 42a and a water supply valve 42b. A drain pipe 45 is connected to the water supply pipe 42 downstream of the water supply valve 42b, and a drain valve 45a is fitted to the drain pipe 45.

[0023] As shown in Figure 5, humidifying nozzle 41 sprays water supplied from water supply pipe 42 and air supplied from air supply pipe 43, spraying the mist of water and air together in fine particles. Humidifier 40 is controlled so that mist of water mixed with air is sprayed intermittently from humidifying nozzle 41 during spraying periods and standby periods. Humidifying nozzle 41 is located on the left side of temperature and humidity adjusting passage 24, below evaporator 35 and heater 26, which are temperature adjusters, and the spray direction of humidifying nozzle 41 is tilted downward to the right rather than horizontal.

[0024] 4 and 5, a temperature sensor 27 and a humidity sensor 28 are disposed in the temperature and humidity adjustment passage 24. The temperature sensor 27 detects the temperature in the temperature and humidity adjustment passage 24 to thereby detect the temperature inside the storage cabinet 20, and the humidity sensor 28 detects the humidity in the temperature and humidity adjustment passage 24 to thereby detect the humidity inside the storage cabinet 20.

[0025] As shown in FIG. 6, the temperature and humidity control chamber 10 includes a control device 50, which is connected to a circulation fan 25, a heater 26, a temperature sensor 27, a humidity sensor 28, a refrigeration device 30 (compressor 31, condenser 32, condenser temperature sensor 32a), and a humidifier 40 (water supply valve 42b, air compressor 44, and drain valve 45a). The control device 50 includes a microcomputer (not shown), which includes a CPU, RAM, ROM, and a timer (all not shown), all of which are connected via a bus. The control device 50 includes a fermentation program (temperature and humidity tube program) stored in the ROM, which sequentially executes a freezing (freezing) process, a retarding (refrigerating) process, a preheating process, and a proofing (fermentation) process on the dough stored in the storage chamber 20. The temperature and humidity control chamber 10 can also selectively execute at least one of the freezing (freezing), retarding (refrigerating), preheating, and proofing (fermentation) processes.

[0026] The fermentation program controls the freezing (freezing) process to maintain the temperature inside the storage cabinet 20 at -5°C for three hours, the retard (refrigeration) process to maintain the temperature inside the storage cabinet 20 at 0°C to 2°C, the preheating process to maintain the temperature inside the storage cabinet 20 at 15°C to 18°C ​​and 65 to 80% humidity for two hours, and the proofing (fermentation) process to maintain the temperature inside the storage cabinet 20 at 26°C to 35°C and 65 to 85% humidity for one hour. These fermentation programs control the retard (refrigeration) process to be performed for the time remaining after subtracting the time required for the freezing (freezing) process, preheating process, and proofing (fermentation) process from the time required from the start of the freezing (freezing) process to the preset end time of the proofing (fermentation) process. Note that the temperature, humidity, and time are merely examples and can be changed depending on the type of bread dough to be fermented, etc.

[0027] The preheating and proofing (fermentation) steps of the fermentation program control the operation of heater 26, refrigeration device 30, and humidifier 40 to maintain the temperature and humidity inside storage cabinet 20 at preset temperature and humidity settings based on the temperature (internal temperature) detected by temperature sensor 27 and the humidity (internal humidity) detected by humidity sensor 28. Compressor 31 has minimum operating and stopping times set to prevent it from starting and stopping in a short period of time. These minimum operating and stopping times may prevent compressor 31 from operating or stopping at the appropriate timing, potentially making it impossible to adjust the temperature and humidity inside storage cabinet 20 to the preset temperature and humidity settings. Even if minimum operating and stopping times are not set for compressor 31, repeated on-off cycles of compressor 31 in a short period of time may result in compressor 31 malfunctioning.

[0028] For this reason, when the proofing (fermentation) process of this fermentation program is executed, the control device 50 is capable of executing compressor low-speed operation control, which controls the compressor 31 to operate continuously at a low-speed operation set at a rotational speed lower than the rated rotational speed (for example, less than half the rated rotational speed), and when the temperature sensor 27 detects an upper limit value of the set temperature (set upper limit temperature) under compressor low-speed operation control, the control device 50 controls the compressor 31 to operate at a rotational speed faster than the low-speed operation, at the rated rotational speed (which may be more than half the rated rotational speed), to cool the inside of the storage facility 20, and when the humidity detected by the humidity sensor 28 detects an upper limit value of the set humidity (set upper limit humidity), the control device 50 controls the compressor 31 to operate at a rotational speed faster than the low-speed operation, at the rated rotational speed (which may be more than half the rated rotational speed), to dehumidify.

[0029] When the compressor low-speed operation control is executed to operate the compressor 31 at low speed, if the temperature at the refrigerant outlet of the condenser 32 is high, operating the compressor 31 at the slowest rotation speed (20% of the rated rotation speed) even in low-speed operation would increase the rotation load on the compressor 31, which could result in poor rotation. Therefore, a lower limit of the rotation speed of the compressor 31 is set according to the temperature at the refrigerant outlet of the condenser 32. For this reason, when executing the compressor low-speed operation control, the control device 50 operates the compressor 31 at 20% of the rated rotation speed as first low-speed operation when the temperature detected by the condenser temperature sensor 32a is lower than 30°C, which is an example of an upper limit set value set for the purpose of protecting the compressor 31. When the temperature detected by the condenser temperature sensor 32a is equal to or higher than 30°C, which is an example of an upper limit set value, the control device 50 operates the compressor 31 at 40% of the rated rotation speed as second low-speed operation.

[0030] When compressor 31 is operated at 40% of the rated rotation speed as the second low-speed operation, the air inside storage 20 is more easily dehumidified than when compressor 31 is operated at 20% of the rated rotation speed as the first low-speed operation. Therefore, when compressor 31 is operated at 20% of the rated rotation speed as the first low-speed operation because the temperature detected by condenser temperature sensor 32a is lower than 30°C, control device 50 controls humidifier 40 to spray water from humidifying nozzle 41 for a spray time of 2 seconds when the humidity detected by humidity sensor 28 becomes equal to or lower than the lower limit of the set humidity, whereas when compressor 31 is operated at 40% of the rated rotation speed as the second low-speed operation because the temperature detected by condenser temperature sensor 32a is 30°C or higher, control device 50 controls humidifier 40 to spray water from humidifying nozzle 41 for a spray time of 4 seconds when the humidity detected by humidity sensor 28 becomes equal to or lower than the lower limit of the set humidity. In this way, even when the compressor 31 is operated at a low speed as the second low speed operation at 40% of the rated rotation speed, the humidifier 40 is controlled to humidify at a higher rate than when the compressor is operated at a first low speed operation at 20% of the rated rotation speed, so that the inside of the storage shed 20 can be humidified with good responsiveness.

[0031] Furthermore, when the set temperature inside the storage cabinet 20 is low, the inside of the storage cabinet 20 is cooled frequently by the refrigeration device 30, whereas when the set temperature inside the storage cabinet 20 is high, the inside of the storage cabinet 20 is cooled less frequently by the refrigeration device 30, and the timing of dehumidification by the refrigeration device 30 is less affected by the timing of cooling. For this reason, it is possible to control so that the compressor low-speed operation control is not executed when the set temperature is 30°C or higher, which is a low-frequency cooling temperature set as a temperature at which the cooling frequency inside the storage cabinet 20 is low (30°C as the low-frequency cooling temperature is one example and is not limited to this). When the compressor low-speed operation control is not executed when the set temperature is higher than the low-frequency cooling temperature, it is possible to prevent the inside of the storage cabinet 20 from being unnecessarily cooled and dehumidified.

[0032] Similarly, when the set humidity inside the storage cabinet 20 is low, the refrigeration device 30 dehumidifies the inside of the storage cabinet 20 frequently, whereas when the set humidity inside the storage cabinet 20 is high, the refrigeration device 30 dehumidifies the inside of the storage cabinet 20 less frequently, and the timing of cooling by the refrigeration device 30 is less affected by the timing of dehumidification. For this reason, it is possible to control so that the compressor low-speed operation control is not executed when the set humidity is 70% or higher as a low-dehumidification-frequency humidity set as a humidity at which the frequency of dehumidification inside the storage cabinet 20 is low (70% as a low-dehumidification-frequency humidity is one example and is not limited to this). When the compressor low-speed operation control is not executed when the set humidity is higher than or equal to the low-dehumidification-frequency humidity, it is possible to avoid unnecessary cooling and dehumidification inside the storage cabinet 20.

[0033] Furthermore, when the set temperature inside the storage cabinet 20 is low, the inside of the storage cabinet 20 is cooled by the refrigeration device 30 frequently, whereas when the set temperature inside the storage cabinet 20 is high, the inside of the storage cabinet 20 is cooled by the refrigeration device 30 less frequently, and the timing of dehumidification by the refrigeration device 30 is less affected by the timing of cooling. When the set humidity inside the storage cabinet 20 is low, the inside of the storage cabinet 20 is dehumidified by the refrigeration device 30 frequently, whereas when the set humidity inside the storage cabinet 20 is high, the inside of the storage cabinet 20 is dehumidified by the refrigeration device 30 less frequently, and the timing of cooling by the refrigeration device 30 is less affected by the timing of dehumidification. For this reason, the compressor low-speed operation control is not executed when the set temperature is 30°C or higher as a low-frequency cooling temperature set as a temperature at which the cooling frequency inside the storage cabinet 20 is low (30°C as a low-frequency cooling temperature is an example and is not limited to this) and the set humidity is 70% or higher as a low-frequency dehumidification humidity set as a humidity at which the dehumidification frequency inside the storage cabinet 20 is low (70% as a low-frequency dehumidification humidity is an example and is not limited to this), and the compressor low-speed operation control is executed when both conditions of being higher than the low-frequency cooling temperature and being higher than the low-frequency dehumidification humidity are not met. When controlled in this way, it is possible to prevent unnecessary cooling and dehumidification inside the storage cabinet 20.

[0034] The control when the fermentation program is executed will be described below. As shown in Fig. 7, the control device 50 executes the fermentation management program to control the freezing (freezing) process (step 101), the retarding (refrigerating) process (step 102), the preheating process (step 103), and the proofing (fermentation) process (step 105 or step 106) in that order. The control device 50 controls the temperature inside the storage cabinet 20 to a set temperature in the freezing (freezing) process and the retarding (refrigerating) process, while controlling the temperature and humidity inside the storage cabinet 20 to a set temperature and set humidity in the preheating process and the proofing (fermentation) process. The control device 50 controls the temperature and humidity under the above-mentioned compressor low-speed operation control according to the set temperature and / or set humidity in the preheating process and the proofing (fermentation) process.

[0035] In the freezing process executed in step 101, the control device 50 controls the operation of the refrigeration device 30 with the circulation fan 25 operating so that the temperature inside the storage cabinet 20 reaches a set temperature corresponding to the freezing process, according to the flowchart shown in FIG. 8. In step 201, the control device 50 determines whether the temperature inside the storage cabinet 20 detected by the temperature sensor 27 is higher than the set temperature for the freezing process. In this embodiment, in the freezing process, the set temperature is generally set to −5° C., which is lower than room temperature. Therefore, the control device 50 determines YES in step 201 and proceeds to step 202 to perform cooling operation of the refrigeration device 30. Note that when the compressor low-speed operation control described later is not being executed, the compressor 31 of the refrigeration device 30 is controlled to operate at the rated rotation speed (the rated rotation speed or a rotation speed equal to or higher than 50% of the rated rotation speed). When the refrigeration device 30 is operated for cooling with the circulation fan 25 in operation, the air in the storage cabinet 20 is sent to the temperature and humidity adjustment passage 24 and cooled by heat exchange with the evaporator 35, and the air cooled in the temperature and humidity adjustment passage 24 is sent back to the storage cabinet 20, and the inside of the storage cabinet 20 is cooled by air circulating between the storage space 23 and the temperature and humidity adjustment passage 24.

[0036] After processing step 202, the control device 50 determines in step 203 whether the temperature detected by the temperature sensor 27 has fallen below a set lower limit temperature that is set 1°C lower than the set temperature. If the temperature detected by the temperature sensor 27 has not fallen below the set lower limit temperature, the control device 50 determines NO in step 203 and returns to step 202, and repeatedly executes the processing of step 202 and the NO determination process in step 203 until the temperature detected by the temperature sensor 27 falls below the set lower limit temperature. If the temperature inside the storage room 20 falls below the set lower limit temperature, the control device 50 determines YES in step 203 and proceeds to step 204, where it stops the cooling operation of the refrigeration device 30 (stopping the operation of the compressor 31 of the refrigeration device 30 to stop the cooling operation).

[0037] After stopping the cooling operation of the refrigeration device 30, the control device 50 determines in step 205 whether the temperature detected by the temperature sensor 27 has risen above a preset upper limit temperature that is set 1°C higher than the set temperature. If the temperature has not risen above the preset upper limit temperature, the control device 50 determines "NO" and proceeds to step 206. In step 206, the control device 50 determines whether the temperature detected by the temperature sensor 27 has fallen below a heating operation transition temperature that is set 3°C ​​lower than the set temperature. If the temperature has not fallen below the heating operation transition temperature, the control device 50 determines "NO" and returns to step 204. The control device 50 repeatedly executes the process of step 204 and the process of determining "NO" in both steps 205 and 206 until the temperature detected by the temperature sensor 27 rises above the preset upper limit temperature. If the temperature detected by the temperature sensor 27 rises above the preset upper limit temperature, the control device 50 determines "YES" in step 205 and returns to step 202. In this way, the control device 50 executes the processes of steps 202 to 206, thereby controlling the temperature inside the storage cabinet 20 to the set temperature through the cooling operation of the refrigeration device 30. In this freezing step, the temperature detected by temperature sensor 27 rarely becomes lower than the heating operation transition temperature, so a description of the processing in steps 207 to 211 after the determination of YES in step 206 will be omitted.

[0038] When three hours (predetermined time) have elapsed since the start of the freezing (refrigeration) process, the control device 50 executes the retard (refrigeration) process in step 102. In the freezing (freezing) process, the temperature inside the storage cabinet 20 is controlled to be set at -5°C, whereas in the retard (refrigeration) process, the temperature inside the storage cabinet 20 is controlled to be set at 2°C. In step 201, the control device 50 determines whether the temperature detected by the temperature sensor 27 is higher than the set temperature of 2°C. The set temperature in the freezing (freezing) process is -5°C, and the set temperature in the retard (refrigeration) process is 2°C, and the temperature detected by the temperature sensor 27 is lower than the set temperature, so the control device 50 determines NO in step 201 and energizes the heater 26 to generate heat in step 207. When the heater 26 is energized to generate heat while the circulation fan 25 is in operation, the air in the storage cabinet 20 is sent to the temperature and humidity adjustment passage 24 and heated by the heater 26, and the air heated in the temperature and humidity adjustment passage 24 is sent back to the storage cabinet 20, and the inside of the storage cabinet 20 is heated by the air circulating between the storage space 23 and the temperature and humidity adjustment passage 24.

[0039] After processing step 207, the control device 50 determines in step 208 whether the temperature detected by the temperature sensor 27 has become higher than the set upper limit temperature, which is set 1°C higher than the set temperature. If the temperature inside the storage cabinet 20 has not become higher than the set upper limit temperature, the control device 50 determines NO in step 208 and returns to step 207, and repeats the processing of steps 207 and 208 until the temperature inside the storage cabinet 20 becomes lower than the set upper limit temperature. If the temperature detected by the temperature sensor 27 becomes higher than the set upper limit temperature, the control device 50 determines YES in step 208 and proceeds to step 209, where it stops the supply of electricity to the heater 26.

[0040] After stopping the supply of power to the heater 26 in step 209, the control device 50 determines in step 210 whether the temperature detected by the temperature sensor 27 has fallen below a set lower limit temperature that is set 1°C lower than the set temperature. If the temperature detected by the temperature sensor 27 has not fallen below the set lower limit temperature, the control device 50 determines NO in step 210 and proceeds to step 211. In step 211, the control device 50 determines whether the temperature detected by the temperature sensor 27 has risen above a cooling operation transition temperature that is set 3°C ​​higher than the set temperature, and if the temperature has not risen above the cooling operation transition temperature, the control device 50 determines NO and returns to step 209.

[0041] When a process in which the set temperature is generally lower than room temperature, such as a retard (refrigeration) process, is executed, the temperature inside the storage cabinet 20 gradually rises to approach room temperature. When the temperature detected by the temperature sensor 27 exceeds the cooling operation transition temperature set at 3°C ​​higher than the set temperature, the control device 50 determines YES in step 211 and proceeds to step 202. The control device 50 executes the processes of steps 202 to 206, and the temperature inside the storage cabinet 20 is controlled to the set temperature by the cooling operation of the refrigeration device 30.

[0042] When a predetermined time has elapsed since the start of the retard (refrigeration) process, the control device 50 executes the preheating process. In the retard (refrigeration) process, the temperature in the storage cabinet 20 is controlled to be 2°C, whereas in the preheating process, the temperature in the storage cabinet 20 is controlled to be 18°C ​​and the humidity in the storage cabinet 20 is controlled to be 70%. In temperature control in the preheating process, the control device 50 determines in step 201 whether the temperature detected by the temperature sensor 27 is higher than the set temperature of 18°C. Since the set temperature in the retard (refrigeration) process is 2°C and the set temperature in the preheating process is 18°C ​​and the temperature detected by the temperature sensor 27 is lower than the set temperature, the control device 50 determines NO in step 201 and energizes the heater 26 to generate heat in step 207. When the heater 26 is energized to generate heat while the circulation fan 25 is in operation, the air in the storage cabinet 20 is sent to the temperature and humidity adjustment passage 24 and heated by the heater 26, and the air heated in the temperature and humidity adjustment passage 24 is sent back to the storage cabinet 20, and the inside of the storage cabinet 20 is heated by the air circulating between the storage space 23 and the temperature and humidity adjustment passage 24.

[0043] After processing step 207, the control device 50 determines in step 208 whether the temperature detected by the temperature sensor 27 has become higher than the set upper limit temperature, which is set 1°C higher than the set temperature. If the temperature inside the storage cabinet 20 has not become higher than the set upper limit temperature, the control device 50 determines NO in step 208 and returns to step 207, and repeats the processing of steps 207 and 208 until the temperature inside the storage cabinet 20 becomes lower than the set upper limit temperature. If the temperature inside the storage cabinet 20 becomes higher than the set upper limit temperature, the control device 50 determines YES in step 208 and proceeds to step 209, where it stops the supply of electricity to the heater 26.

[0044] After stopping the supply of power to the heater 26 in step 209, the control device 50 determines in step 210 whether the temperature detected by the temperature sensor 27 has fallen below a set lower limit temperature that is set 1°C lower than the set temperature. If the temperature detected by the temperature sensor 27 has not fallen below the set lower limit temperature, the control device 50 determines NO in step 210 and proceeds to step 211. In step 211, the control device 50 determines whether the temperature detected by the temperature sensor 27 has risen above a cooling operation transition temperature that is set 3°C ​​higher than the set temperature, and if it has not risen above the cooling operation transition temperature, the control device 50 determines NO and returns to step 209. In this way, by executing the processes of steps 207 to 211, the control device 50 controls the temperature inside the storage 20 to the set temperature by heating with the heater 26.

[0045] The set temperature for the preheating process may be higher or lower than room temperature depending on the season, and the temperature inside storage cabinet 20 may be higher or lower than the set temperature. When controlling the cooling of storage cabinet 20 by executing the processing of steps 202 to 206, if the temperature detected by temperature sensor 27 falls below a heating operation transition temperature set 3°C ​​lower than the set temperature, control device 50 determines YES in step 206 and proceeds to the heating process of steps 207 to 211. On the other hand, when controlling the heating of storage cabinet 20 by executing the processing of steps 207 to 211, if the temperature detected by temperature sensor 27 rises above a cooling operation transition temperature set 3°C ​​higher than the set temperature, control device 50 determines YES in step 211 and proceeds to the cooling process of steps 202 to 206. By executing the processing of steps 202 to 211, control device 50 controls the temperature inside storage cabinet 20 to the set temperature by the cooling operation of refrigeration device 30 and / or heating by heater 26.

[0046] In the preheating process, control for adjusting the temperature is performed in addition to control for adjusting the humidity. As shown in FIG. 9, in the humidity control for this preheating process, the control device 50 determines in step 301 whether a heating operation is being performed at the start of the process (at the time of transition to the process). When the temperature inside the storage cabinet 20 is rising, as at the start of the process (after the transition to the process), the relative humidity inside the storage cabinet 20 is also likely to fluctuate. This makes it difficult to stably adjust the humidity inside the storage cabinet 20, so the control device 50 controls the humidifier 40 not to perform a humidifying operation and the refrigeration device 30 not to perform a dehumidifying operation. When the heating operation inside the storage cabinet 20 at the start of the process (after the transition to the process) is completed, the control device 50 determines NO in step 301 and determines in step 302 whether the humidity detected by the humidity sensor 28 (the humidity inside the storage cabinet) is higher than the set humidity of 70% RH. If the humidity detected by the humidity sensor 28 is lower than the set humidity, the control device 50 determines NO in step 302 and starts the humidifying operation process starting from step 303.

[0047] In step 303, the control device 50 determines whether the refrigeration device 30 is in cooling operation based on the temperature detected by the temperature sensor 27 being higher than the set upper limit temperature. If the temperature detected by the temperature sensor 27 is higher than the set upper limit temperature and the refrigeration device 30 is not in cooling operation (when the cooling of the refrigeration device 30 is stopped or heating is being controlled by the heater 26), the control device 50 determines NO in step 303 and causes the humidifier 40 to perform humidification operation in step 304. The humidification operation of the humidifier 40 gradually increases the humidity in the storage cabinet 20, and in step 305, the control device 50 determines whether the humidity detected by the humidity sensor 28 has exceeded the set upper limit humidity, which is set 5% RH higher than the set humidity. If the humidity detected by the humidity sensor 28 is not higher than the set upper limit humidity, the control device 50 determines NO in step 305 and returns to step 303. When the processing of steps 303 to 305 is repeatedly executed and the temperature detected by temperature sensor 27 is higher than the set upper limit temperature and the refrigeration device 30 is put into cooling operation, the control device 50 determines YES in step 303 and stops the humidification operation of the humidifier 40 in step 306. Also, when the humidity detected by humidity sensor 28 becomes higher than the set upper limit humidity while the processing of steps 303 to 305 is repeatedly executed, the control device 50 determines YES in step 305 and stops the humidification operation of the humidifier 40 in step 306.

[0048] When the humidification operation of the humidifier 40 is stopped, the control device 50 determines in step 307 whether the humidity detected by the humidity sensor 28 has fallen below a set lower-limit humidity that is set 5% RH lower than the set humidity. If the humidity detected by the humidity sensor 28 has not fallen below the set lower-limit humidity, the control device 50 determines "NO" and proceeds to step 308. In step 308, the control device 50 determines whether the humidity detected by the humidity sensor 28 has risen above a dehumidification operation transition humidity that is set 10% RH higher than the set humidity, and determines whether it is necessary to dehumidify the inside of the storage cabinet 20. If the humidity detected by the humidity sensor 28 has not risen above the dehumidification operation transition humidity, the control device 50 determines "NO" in step 308 and returns to step 306. If the humidity detected by the humidity sensor 28 falls below the set lower-limit humidity while the processes of steps 306 to 308 are being repeatedly executed, the control device 50 determines "YES" in step 307 and returns to step 303. By executing the processing of steps 303 to 308, the control device 50 controls the humidifying operation of the humidifier 40 to control the humidity inside the storage cabinet 20 to the set humidity. Note that after the heating operation at the start of the process (at the time of transition to the process), even if the heater 26 is in heating operation, the control device 50 executes the humidifying operation of the humidifier 40 based on the humidity detected by the humidity sensor 28 to control the humidity detected by the humidity sensor 28 to the set humidity.

[0049] In contrast, after the heating operation at the start of the process (at the time of process transition) is completed, if the humidity detected by the humidity sensor 28 is higher than the set humidity and the answer is YES in step 302, or if the humidity detected by the humidity sensor 28 becomes higher than the humidity at which dehumidification operation transition occurs and the answer is YES in step 308, the control device 50 starts processing the dehumidification operation starting from step 309.

[0050] In step 309, the control device 50 determines whether the temperature detected by the temperature sensor 27 is lower than the set lower limit temperature and therefore the heater 26 is energized to generate heat. If the temperature detected by the temperature sensor 27 is lower than the set lower limit temperature and therefore the heater 26 is not energized to generate heat ((when the heater 26 is not energized or when control is being performed so that cooling is performed by the refrigeration device 30)), the control device 50 determines NO in step 309 and performs dehumidification operation of the refrigeration device 30 in step 310. Note that when compressor low-speed operation control, which will be described later, is not being executed, the compressor 31 of the refrigeration device 30 is controlled to operate at the rated rotation speed (the rated rotation speed or a rotation speed that is 50% or more of the rated rotation speed).

[0051] The humidity in the storage cabinet 20 gradually decreases due to the dehumidifying operation of the refrigeration device 30, and the control device 50 determines in step 311 whether the humidity detected by the humidity sensor 28 has fallen below a set lower-limit humidity that is set 5% RH lower than the set humidity. If the humidity detected by the humidity sensor 28 has not fallen below the set lower-limit humidity, the control device 50 determines NO in step 311 and returns to step 309. If the heater 26 is activated because the temperature detected by the temperature sensor 27 is lower than the set lower-limit temperature while the processing of steps 309 to 311 is being repeatedly executed, the control device 50 determines YES in step 309 and stops the dehumidifying operation of the refrigeration device 30 in step 312. Furthermore, if the humidity detected by the humidity sensor 28 falls below the set lower-limit humidity while the processing of steps 309 to 311 is being repeatedly executed, the control device 50 also determines YES in step 311 and stops the dehumidifying operation of the refrigeration device 30 in step 312.

[0052] When the dehumidification operation of the refrigeration device 30 is stopped, the control device 50 determines in step 313 whether the humidity detected by the humidity sensor 28 has become higher than a set upper limit humidity, which is set 5% RH higher than the set humidity. If the humidity detected by the humidity sensor 28 is not higher than the set upper limit humidity, the control device 50 determines "NO" and proceeds to step 314. In step 314, the control device 50 determines whether the humidity detected by the humidity sensor 28 has become lower than a humidification operation transition humidity, which is set 10% RH lower than the set humidity, and determines whether it is necessary to humidify the inside of the storage cabinet 20. If the humidity detected by the humidity sensor 28 is not lower than the humidification operation transition humidity, the control device 50 determines "NO" in step 314 and returns to step 312. If the humidity detected by the humidity sensor 28 becomes higher than the set upper limit humidity while repeatedly executing the processes of steps 312 to 314, the control device 50 determines "YES" in step 313 and returns to step 309. By executing the processing of steps 309 to 314, the control device 50 controls the dehumidifying operation of the refrigeration device 30 to control the humidity inside the storage cabinet 20 to the set humidity. Note that, when the humidity detected by the humidity sensor 28 becomes lower than the humidity at which the storage cabinet 20 transitions to humidification operation while the dehumidifying operation is being performed, the control device 50 determines YES in step 314 and executes the humidification operation starting from step 303. In this way, the humidity inside the storage cabinet 20 is controlled to the set humidity by the processing for executing humidity adjustment starting from step 301.

[0053] The control device 50 ends the preheating process two hours after the start of the preheating process, and in step 104 determines whether the set temperature inside the storage cabinet 20 when the proofing (fermentation) process is performed is higher than 30°C, which is a low-frequency cooling temperature set as a temperature at which cooling by the refrigeration device 30 is low. When the set temperature of the storage cabinet 20 is high, such as when the set temperature inside the storage cabinet 20 is set to 32°C and the set humidity is set to 70%, and is maintained for one hour during the proofing (fermentation) process, the frequency with which the storage cabinet 20 is cooled by the refrigeration device 30 is low. If the set temperature inside the storage cabinet 20 is a temperature at which cooling by the refrigeration device 30 is low, the timing of dehumidification by the refrigeration device 30 is less affected by the timing of cooling.

[0054] For this reason, if the set temperature for the proofing (fermentation) process is equal to or higher than 30°C, which is set as the low-frequency cooling temperature, the control device 50 determines YES in step 104 and executes the proofing (fermentation) process without executing the compressor low-speed operation control. The proofing (fermentation) process without executing the compressor low-speed operation control is the same as the preheating process described above in terms of temperature control and humidity control using the control device 50, except that the set temperature, set humidity, and time differ from those of the preheating process. A description of the proofing (fermentation) process without executing the compressor low-speed operation control will be omitted.

[0055] In contrast, when the set temperature of the storage cabinet 20 is not high, such as when the set temperature and set humidity in the storage cabinet 20 are set to be maintained at 27°C and 70% for one hour during the proofing (fermentation) process, the control device 50 determines NO in step 104 and executes the proofing (fermentation) process under compressor low-speed operation control. As shown in Fig. 10, in temperature control of the proofing (fermentation) process under compressor low-speed operation control, the control device 50 heats the inside of the storage cabinet 20 by energizing the heater 26 until the temperature detected by the temperature sensor 27 reaches the set temperature of 27°C, as a heating operation at the start of the process of heating the temperature inside the storage cabinet 20, which has been adjusted to the set temperature of the preheating process, to the set temperature of the proofing (fermentation) process.

[0056] Next, in step 402, the control device 50 determines whether the temperature detected by the condenser temperature sensor 32a is lower than 30°C, which is an upper limit setting value set for the purpose of protecting the compressor 31. When the temperature detected by the condenser temperature sensor 32a is lower than 30°C, the control device 50 determines YES in step 402 and operates the compressor 31 of the refrigeration device 30 at a first low-speed operation (20% of the rated rotation speed) in step 403. On the other hand, when the temperature detected by the condenser temperature sensor 32a is 30°C or higher, the control device 50 determines NO in step 402 and operates the compressor 31 of the refrigeration device 30 at a second low-speed operation (40% of the rated rotation speed) in step 404.

[0057] With the compressor 31 operating at low speed (first or second low speed) in step 403 or 404, the control device 50 determines in step 405 whether the temperature detected by the temperature sensor 27 is higher than the set temperature of 27°C. If the temperature detected by the temperature sensor 27 is higher than the set temperature of 27°C, the control device 50 determines YES in step 405 and proceeds to step 406. In step 406, the control device 50 changes the rotation speed of the compressor 31 of the refrigeration device 30 to the rated rotation speed, and performs cooling operation on the refrigeration device 30. When the compressor 31 of the refrigeration device 30 is rotated at the rated rotation speed and performs cooling operation with the circulation fan 25 operating, the air in the storage cabinet 20 is sent to the temperature and humidity adjustment passage 24 and cooled by heat exchange with the evaporator 35. The air cooled in the temperature and humidity adjustment passage 24 is sent back to the storage cabinet 20, and the inside of the storage cabinet 20 is cooled by the cooled air circulating between the storage cabinet 20 and the temperature and humidity adjustment passage 24.

[0058] After processing step 406, the control device 50 determines in step 407 whether the temperature detected by the temperature sensor 27 has fallen below the set lower limit temperature, which is set 1°C lower than the set temperature. If the temperature detected by the temperature sensor 27 has not fallen below the set lower limit temperature, the control device 50 determines NO in step 407 and returns to step 406, and repeats the NO determination processes of steps 406 and 407 until the temperature detected by the temperature sensor 27 falls below the set lower limit temperature. If the temperature inside the storage cabinet 20 falls below the set lower limit temperature, the control device 50 determines YES in step 407 and proceeds to step 408, where it returns the compressor 31 of the refrigeration device 30 to low-speed operation (first or second low-speed operation).

[0059] After processing step 408, the control device 50 determines in step 409 whether the temperature detected by temperature sensor 27 has become higher than the set upper limit temperature, which is set 1°C higher than the set temperature. If the temperature is not higher than the set upper limit temperature, the control device 50 determines NO and proceeds to step 410. In step 410, the control device 50 determines whether the temperature detected by temperature sensor 27 has become lower than the heating operation transition temperature, which is set 3°C ​​lower than the set temperature. If the temperature is not lower than the heating operation transition temperature, the control device 50 determines NO and returns to step 408. The control device 50 repeatedly executes the processing of step 408 and the NO determination processing in both steps 409 and 410 until the temperature detected by temperature sensor 27 becomes higher than the set upper limit temperature. If the temperature detected by temperature sensor 27 becomes higher than the set upper limit temperature, the control device 50 determines YES in step 409 and returns to step 406. In this way, by executing the processing of steps 406 to 410, the control device 50 controls the temperature inside the storage room 20 to the set temperature through the cooling operation of the refrigeration device 30 (cooling operation when the compressor 31 of the refrigeration device 30 is operated at the rated rotation speed).

[0060] If, after operating compressor 31 at low speed (first or second low speed) in step 403 or 404, the temperature inside storage cabinet 20 is lower than the set temperature and the temperature detected by temperature sensor 27 is equal to or lower than the set temperature of 27°C, control device 50 determines NO in step 405 and energizes heater 26 to generate heat in step 411. When heater 26 is energized to generate heat while circulation fan 25 is operating, the air inside storage cabinet 20 is sent to temperature and humidity adjustment passage 24 and heated by heater 26, and the air heated in temperature and humidity adjustment passage 24 is sent back to storage cabinet 20, and the inside of storage cabinet 20 is heated by the heated air circulating between storage cabinet 20 and temperature and humidity adjustment passage 24.

[0061] After processing step 411, the control device 50 determines in step 412 whether the temperature detected by the temperature sensor 27 has become higher than the set upper limit temperature, which is set 1°C higher than the set temperature. If the temperature inside the storage cabinet 20 has not become higher than the set upper limit temperature, the control device 50 determines NO in step 412 and returns to step 411, and repeats the processing of steps 411 and 412 until the temperature inside the storage cabinet 20 becomes lower than the set upper limit temperature. If the temperature inside the storage cabinet 20 becomes higher than the set upper limit temperature, the control device 50 determines YES in step 412 and proceeds to step 413, where it stops the supply of power to the heater 26.

[0062] After stopping the supply of power to the heater 26 in step 413, the control device 50 determines in step 414 whether the temperature detected by the temperature sensor 27 has fallen below a set lower limit temperature that is set 1°C lower than the set temperature. If the temperature detected by the temperature sensor 27 has not fallen below the set lower limit temperature, the control device 50 determines NO in step 414 and proceeds to step 415. In step 415, the control device 50 determines whether the temperature detected by the temperature sensor 27 has risen above a cooling operation transition temperature that is set 3°C ​​higher than the set temperature, and if it has not risen above the cooling operation transition temperature, the control device 50 determines NO and returns to step 413. In this way, by executing the processes of steps 411 to 415, the control device 50 controls the temperature inside the storage 20 to the set temperature by heating with the heater 26.

[0063] Depending on the set temperature for the proofing (fermentation) process, it may be higher or lower than room temperature, and so the temperature inside storage cabinet 20 may be higher or lower than the set temperature. When controlling the inside of storage cabinet 20 to be cooled by executing the processes of steps 406 to 410, if the temperature detected by temperature sensor 27 falls below the heating operation transition temperature set 3°C ​​lower than the set temperature, control device 50 determines YES in step 410 and proceeds to the heating process of steps 411 to 415. On the other hand, when controlling the inside of storage cabinet 20 to be heated by executing the processes of steps 411 to 415, if the temperature detected by temperature sensor 27 rises above the cooling operation transition temperature set 3°C ​​higher than the set temperature, control device 50 determines YES in step 415 and proceeds to the cooling process of steps 406 to 410. By executing the processing of steps 405 to 415, the control device 50 controls the temperature inside the storage room 20 to the set temperature by the cooling operation of the refrigeration device 30 (cooling operation when the compressor 31 of the refrigeration device 30 is operated at the rated rotation speed) and / or heating by the heater 26.

[0064] 11, in the humidity control of the proofing (fermentation) process, the control device 50 determines in step 501 whether a heating operation is being performed at the start of the process (at the time of transition to the process). When the temperature inside the storage cabinet 20 is rising, as at the start of the process (after the transition to the process), the relative humidity inside the storage cabinet 20 is also likely to fluctuate. This makes it difficult to stably adjust the humidity inside the storage cabinet 20, so the control device 50 controls the humidifier 40 not to perform a humidifying operation and the refrigeration device 30 not to perform a dehumidifying operation. When the heating operation inside the storage cabinet 20 at the start of the process (after the transition to the process) is completed, the control device 50 determines NO in step 501 and determines in step 502 whether the humidity detected by the humidity sensor 28 (the humidity inside the storage cabinet) is higher than the set humidity of 70% RH. If the humidity detected by the humidity sensor 28 is lower than the set humidity, the control device 50 determines NO in step 502 and starts the humidifying operation process starting from step 503.

[0065] In step 503, the control device 50 determines whether the refrigeration device 30 is in cooling operation (cooling operation at the rated rotation speed of the compressor 31) because the temperature detected by the temperature sensor 27 is higher than the set upper limit temperature. If the refrigeration device 30 is not in cooling operation (cooling operation at the rated rotation speed of the compressor 31) because the temperature detected by the temperature sensor 27 is lower than the set upper limit temperature (when cooling of the refrigeration device 30 is stopped or heating control by the heater 26 is being performed), the control device 50 determines NO in step 503 and performs a humidification operation on the humidifier 40 in step 504. When the compressor 31 is operated at the second low speed operation in step 404, the amount of humidification sprayed from the humidification nozzle 41 is controlled to be greater when the humidifier 40 is operated at the first low speed operation. In this embodiment, when the compressor 31 is operated at the first low speed, the injection time is set to 2 seconds and the standby time is set to 2 seconds, whereas when the compressor 31 is operated at the second low speed, the injection time is set to 4 seconds and the standby time is set to 2 seconds.

[0066] The humidity in the storage cabinet 20 gradually increases due to the humidifying operation of the humidifier 40, and the control device 50 determines in step 505 whether the humidity detected by the humidity sensor 28 has become higher than the set upper limit humidity, which is set 5% RH higher than the set humidity. If the humidity detected by the humidity sensor 28 is not higher than the set upper limit humidity, the control device 50 determines NO in step 505 and returns to step 503. If, while repeatedly executing the processes of steps 503 to 505, the temperature detected by the temperature sensor 27 is higher than the set upper limit temperature and the refrigeration device 30 is operating in cooling mode (cooling mode at the rated rotation speed of the compressor 31), the control device 50 determines YES in step 503 and stops the humidifying operation of the humidifier 40 in step 506. Furthermore, if, while repeatedly executing the processes of steps 503 to 505, the humidity detected by the humidity sensor 28 becomes higher than the set upper limit humidity, the control device 50 also determines YES in step 505 and stops the humidifying operation of the humidifier 40 in step 506.

[0067] When the humidification operation of the humidifier 40 is stopped, the control device 50 determines in step 507 whether the humidity detected by the humidity sensor 28 has fallen below a set lower-limit humidity that is set 5% RH lower than the set humidity. If the humidity detected by the humidity sensor 28 has not fallen below the set lower-limit humidity, the control device 50 determines "NO" and proceeds to step 508. In step 508, the control device 50 determines whether the humidity detected by the humidity sensor 28 has risen above a dehumidification operation transition humidity that is set 10% RH higher than the set humidity, and determines whether it is necessary to dehumidify the inside of the storage cabinet 20. If the humidity detected by the humidity sensor 28 has not risen above the dehumidification operation transition humidity, the control device 50 determines "NO" in step 508 and returns to step 506. If the humidity detected by the humidity sensor 28 falls below the set lower-limit humidity while the processes of steps 506 to 508 are being repeatedly executed, the control device 50 determines "YES" in step 507 and returns to step 503. By executing the processing of steps 503 to 508, the control device 50 controls the humidifying operation of the humidifier 40 to control the humidity inside the storage cabinet 20 to the set humidity. Note that after the heating operation at the start of the process (at the time of transition to the process), even if the heater 26 is in heating operation, the control device 50 executes the humidifying operation of the humidifier 40 based on the humidity detected by the humidity sensor 28 to control the humidity detected by the humidity sensor 28 to the set humidity.

[0068] In contrast, when the judgment in step 502 is YES because the detected humidity of the humidity sensor 28 is higher than the set humidity after the heating operation in the storage cabinet 20 has ended at the start of the process (after the process transition), or when the judgment in step 508 is YES because the detected humidity of the humidity sensor 28 has become higher than the humidity at which the dehumidification operation transition occurs, the control device 50 starts processing the dehumidification operation starting from step 509.

[0069] In step 509, the control device 50 determines whether the heater 26 is being energized to generate heat because the temperature detected by the temperature sensor 27 is lower than the set lower limit temperature. If the heater 26 is not being energized to generate heat because the temperature detected by the temperature sensor 27 is lower than the set lower limit temperature (when the heater 26 is not energized or when control is being performed so that cooling is performed by the refrigeration device 30), the control device 50 determines NO in step 509, and in step 510 operates the compressor 31 of the refrigeration device 30 from low speed operation (first or second low speed operation) to the rated rotation speed to perform dehumidification operation. The dehumidification operation of the refrigeration device 30 gradually reduces the humidity in the storage room 20, and in step 511 the control device 50 determines whether the humidity detected by the humidity sensor 28 has fallen below the set lower limit humidity, which is set to be 5% RH lower than the set humidity. If the humidity detected by the humidity sensor 28 has not fallen below the set lower limit humidity, If not, the control device 50 determines NO in step 511 and returns to step 509. If, while repeatedly executing the processes of steps 509 to 511, the temperature detected by the temperature sensor 27 is lower than the set lower limit temperature and the heater 26 is activated, the control device 50 determines YES in step 509 and operates the compressor 31 of the refrigeration device 30 at a low speed (first or second low speed operation) in step 512 to stop the dehumidifying operation. Also, while repeatedly executing the processes of steps 509 to 511, if the humidity detected by the humidity sensor 28 becomes lower than the set lower limit humidity, the control device 50 determines YES in step 511 and operates the compressor 31 of the refrigeration device 30 at a low speed in step 512 to stop the dehumidifying operation.

[0070] When the dehumidification operation is stopped by operating the compressor 31 of the refrigeration device 30 at a low speed (first or second low speed), the control device 50 determines in step 513 whether the humidity detected by the humidity sensor 28 has become higher than a set upper limit humidity that is set 5% RH higher than the set humidity, and if the humidity detected by the humidity sensor 28 is not higher than the set upper limit humidity, the determination is NO and the process proceeds to step 514. In step 514, the control device 50 determines whether the humidity detected by the humidity sensor 28 has become lower than a humidification operation transition humidity that is set 10% RH lower than the set humidity, and determines whether it is necessary to humidify the inside of the storage cabinet 20. If the humidity detected by the humidity sensor 28 is not lower than the humidification operation transition humidity, the control device 50 determines NO in step 514 and returns to step 512.

[0071] If the humidity detected by humidity sensor 28 becomes higher than the set upper limit humidity while the processes of steps 512 to 514 are being repeatedly executed, control device 50 determines YES in step 513 and returns to step 509. By executing the processes of steps 509 to 514, control device 50 controls the dehumidification operation of refrigeration device 30 (dehumidification operation when compressor 31 of refrigeration device 30 is operated at the rated rotation speed) to control the humidity inside storage cabinet 20 to the set humidity. Note that, if the humidity detected by humidity sensor 28 becomes lower than the humidity at which humidification operation is initiated during dehumidification operation, control device 50 determines YES in step 514 and executes humidification operation starting from step 503. In this way, the humidity inside storage cabinet 20 is controlled to the set humidity by the process for executing humidity adjustment starting from step 501. The temperature inside the storage cabinet 20 is adjusted to the set temperature by the process starting from step 401, and the humidity inside the storage cabinet 20 is adjusted to the set humidity by the process starting from step 501. After one hour has passed since the start of these processes, the proofing (fermentation) process is completed and the fermentation program is terminated.

[0072] In the temperature and humidity control cabinet 10 configured as described above, the control device 50 can execute compressor low-speed operation control, which controls the compressor 31 to operate continuously at a low-speed operation (first or second low-speed operation) set at a rotation speed lower than the rated rotation speed after the heating operation at the start of the proofing (fermentation) process (temperature and humidity control program) of the fermentation program. When the temperature sensor 27 detects that the set temperature is above the set upper limit temperature (upper limit) under compressor low-speed operation control, the control device 50 controls the compressor 31 to operate at the rated rotation speed, which is faster than the low-speed operation, to cool the inside of the storage cabinet 20, and when the humidity detected by the humidity sensor 28 is above the set upper limit humidity (upper limit), the control device 50 controls the compressor 31 to operate at the rated rotation speed, which is faster than the low-speed operation, to dehumidify.

[0073] When the proofing (fermentation) step (temperature and humidity control program) of the fermentation program is executed to adjust the temperature and humidity inside the storage cabinet 20, the compressor 31 is maintained in a continuous operating state, although the rotation speed varies between operating at low speed and operating at a rotation speed faster than low speed. This makes it possible to appropriately cool and dehumidify the inside of the storage cabinet 20, even if minimum operating and stop times are set for the purpose of protecting the compressor 31. Furthermore, even if minimum operating and stop times for the purpose of protecting the compressor 31 are not set, the compressor 31 will not start and stop (start and stop) in a short period of time, thereby extending the product life of the compressor 31.

[0074] A condenser temperature sensor 32a is provided around the condenser 32 to detect the temperature of the refrigerant outlet, and the control device 50 operates the compressor 31 in first low-speed operation at 20% of the rated rotation speed when the temperature detected by the condenser temperature sensor 32a is lower than 30°C, which is the upper limit set value set for the purpose of protecting the compressor 31, and operates the compressor 31 in second low-speed operation at 40% of the rated rotation speed when the temperature detected by the condenser temperature sensor 32a is equal to or higher than 30°C, which is the upper limit set value, and controls the amount of humidification by the humidifier 40 to be increased.

[0075] When the temperature of condenser temperature sensor 32a is high, it may not be possible to operate compressor 31 at a slower rotation speed in order to protect compressor 31. When the temperature detected by condenser temperature sensor 32a exceeds an upper limit set value that is set for the purpose of protecting compressor 31, compressor 31 can be operated at a second low-speed operation (40% of the rated rotation speed), which is a faster rotation speed even at low speed, thereby making compressor 31 less likely to break down. In this case, if compressor 31 is operated at the second low-speed operation (40% of the rated rotation speed), which is a faster rotation speed than the first low-speed operation (20% of the rated rotation speed), the humidity inside storage cabinet 20 is likely to be lower than when compressor 31 is operated at the first low-speed operation. However, because the amount of humidification by humidifier 40 is controlled to be increased, the inside of storage cabinet 20 can be humidified with good responsiveness. Although the first low-speed operation is set to 20% of the rated rotation speed and the second low-speed operation is set to 40% of the rated rotation speed, this is not limited to these and the first and second low-speed operations may be set arbitrarily to a rotation speed that is half or less of the rated rotation speed.

[0076] In step 104, the control device 50 determines whether the set temperature is lower than 30°C, which is the low-frequency cooling temperature set as the temperature at which cooling in the storage facility 20 is performed with a low frequency.If the set temperature is higher than 30°C, which is the low-frequency cooling temperature set as the temperature at which cooling in the storage facility 20 is performed with a low frequency (YES determination process in step 104), the control device 50 controls in step 105 to execute a proofing (fermentation) process in which compressor low-speed operation control is not performed, and if the set temperature is lower than the low-frequency cooling temperature (NO determination process in step 104), the control device 50 controls in step 106 to execute a proofing (fermentation) process in which compressor low-speed operation control is performed.

[0077] When the set temperature inside the storage cabinet 20 is low, the inside of the storage cabinet 20 is cooled frequently by the refrigeration device 30, whereas when the set temperature inside the storage cabinet 20 is high, the inside of the storage cabinet 20 is cooled less frequently by the refrigeration device 30, and the timing of dehumidification by the refrigeration device 30 is less affected by the timing of cooling. For this reason, by controlling so that the compressor low-speed operation control is not executed when the set temperature is equal to or higher than the low-frequency cooling temperature set as the temperature at which the frequency of cooling inside the storage cabinet 20 is low, it is possible to prevent the inside of the storage cabinet from being cooled and dehumidified unnecessarily.

[0078] In the above embodiment, before the proofing (fermentation) step is performed, a process is performed to determine whether the set temperature is lower than 30°C, which is a low-frequency cooling temperature set as a temperature at which cooling in the storage 20 is performed with a low frequency, and based on the result of this determination, control is performed to selectively perform either a proofing (fermentation) step in which compressor low-speed operation control is performed or a proofing (fermentation) step in which compressor low-speed operation control is not performed. The present invention is not limited to this, and, similar to step 104, before the preheating step is performed, control may be performed to selectively perform either a preheating step in which compressor low-speed operation control is performed or a preheating step in which compressor low-speed operation control is not performed based on the result of this determination.

[0079] In the above embodiment, the control device 50 determines in step 104 whether the set temperature is lower than 30°C, which is a low-frequency cooling temperature set as a temperature at which cooling is performed infrequently inside the storage cabinet 20. The present invention is not limited to this, and it may also be possible to determine in step 104 whether the set humidity is higher than, for example, 70%, a low-frequency dehumidification humidity set as a humidity at which dehumidification is performed infrequently inside the storage cabinet 20, and control to execute a proofing (fermentation) process in which the compressor low-speed operation control is not executed when the set humidity is 70% or lower as the low-frequency dehumidification humidity, and control to execute a proofing (fermentation) process in which the compressor low-speed operation control is executed when the set humidity is higher than 70% as the low-frequency dehumidification humidity.

[0080] By controlling so that the compressor low-speed operation control is not executed when the set humidity is equal to or higher than the low-dehumidification-frequency humidity set as the temperature at which the frequency of dehumidification inside the storage cabinet 20 is low, it is possible to avoid unnecessary cooling and dehumidification inside the storage cabinet 20. In this case as well, before executing the preheating step, it may be determined whether the set humidity is lower than the low-dehumidification-frequency humidity set as the humidity at which the frequency of dehumidification inside the storage cabinet 20 is low, and control may be performed so that the preheating step is executed without executing the compressor low-speed operation control when the set humidity is equal to or lower than the low-dehumidification-frequency humidity, and control may be performed so that the preheating step is executed with the compressor low-speed operation control when the set humidity is higher than the low-dehumidification-frequency humidity.

[0081] Alternatively, in step 104, it may be determined whether the set temperature is lower than 30°C, which is the low-frequency cooling temperature set as the temperature at which cooling in the storage cabinet 20 is performed at a low frequency, and whether the set humidity is lower than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage cabinet 20 is performed at a low frequency. When the set temperature is equal to or higher than the low-frequency cooling temperature set as the temperature at which cooling in the storage cabinet 20 is performed at a low frequency and the set humidity is equal to or higher than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage cabinet 20 is performed at a low frequency, the proofing (fermentation) process may be executed to execute the low-speed compressor operation control. By controlling not to execute the low-speed compressor operation control when the set temperature is equal to or higher than the low-frequency cooling temperature set as the temperature at which cooling in the storage cabinet 20 is performed at a low frequency and the set humidity is equal to or higher than the low-frequency dehumidification humidity set as the temperature at which dehumidification in the storage cabinet 20 is performed at a low frequency, it is possible to prevent unnecessary cooling and dehumidification inside the storage cabinet 20. In this case, before the preheating process is executed, it is determined whether the set temperature is lower than 30°C, which is the low-frequency cooling temperature set as the temperature at which cooling in the storage cabinet 20 is performed with a low frequency, and whether the set humidity is lower than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage cabinet 20 is performed with a low frequency.When the set temperature is higher than the low-frequency cooling temperature set as the temperature at which cooling in the storage cabinet 20 is performed with a low frequency and the set humidity is higher than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage cabinet is performed with a low frequency, the preheating process may be controlled to execute compressor low-speed operation control.

[0082] In the temperature and humidity controlled cabinet configured as described above, the temperature detected by the condenser temperature sensor 32a is set as an upper limit set value for the purpose of protecting the compressor 31, and various temperatures or humidities are set as the cooling low-frequency temperature and dehumidification low-frequency humidity, but the present invention is not limited to these temperatures and humidities. [Explanation of symbols]

[0083] 10...Temperature and humidity control cabinet, 20...Storage cabinet, 25...Circulation fan, 26...Heater, 27...Temperature sensor, 28...Humidity sensor, 30...Refrigeration device, 31...Compressor, 32...Condenser, 32a...Condenser temperature sensor, 34...Expansion means (capillary tube), 35...Evaporator, 40...Humidifier, 50...Control device

Claims

1. A storage cabinet for storing items; A circulation fan that circulates air inside the storage cabinet; a refrigeration device that dehumidifies and cools the inside of the storage cabinet; a heater for heating the inside of the storage compartment; a humidifier for humidifying the interior of the storage cabinet; a temperature sensor for detecting the temperature inside the storage facility; a humidity sensor for detecting humidity inside the storage compartment; a control device for controlling the operation of the refrigeration device, the heater, and the humidifier; The control device is a temperature and humidity regulated cabinet having a temperature and humidity management program that controls the operation of the refrigeration device, the heater, and the humidifier so that the temperature and humidity in the cabinet become preset temperature and preset humidity based on the temperature detected by the temperature sensor and the humidity detected by the humidity sensor, The refrigeration device includes a compressor that compresses and sends out a refrigerant, a condenser that cools and liquefies the refrigerant compressed by the compressor, expansion means that expands the liquefied refrigerant liquefied by the condenser, and an evaporator that cools and dehumidifies the inside of the storage compartment by using heat of vaporization when the expanded liquefied refrigerant is vaporized, and the rotation speed of the compressor is changeable to change the amount of refrigerant sent out, The control device, when executing the temperature and humidity management program, is capable of executing compressor low-speed operation control that controls the compressor to be continuously operated at low-speed operation set at a rotation speed lower than a rated rotation speed, and when the temperature detected by the temperature sensor under the compressor low-speed operation control becomes equal to or higher than the upper limit of the set temperature, controls the compressor to operate at a rotation speed faster than the low-speed operation to cool the inside of the storage cabinet, and when the humidity detected by the humidity sensor becomes equal to or higher than the upper limit of the set humidity, controls the compressor to operate at a rotation speed faster than the low-speed operation to dehumidify, the low-speed operation of the compressor is set to a first low-speed operation and a second low-speed operation having a rotation speed higher than that of the first low-speed operation, a condenser temperature sensor for detecting the temperature around the condenser; The control device is characterized in that when the temperature detected by the condenser temperature sensor is lower than an upper limit set value set for the purpose of protecting the compressor, the control device operates the compressor at the first low speed operation, and when the temperature detected by the condenser temperature sensor is equal to or higher than the upper limit set value, the control device operates the compressor at the second low speed operation and controls the amount of humidification by the humidifier to be increased.

2. The temperature and humidity controlled cabinet according to claim 1, The control device controls the compressor so that the low-speed operation control is not performed when the set temperature is equal to or higher than a low-frequency cooling temperature set as a temperature at which cooling is performed less frequently in the storage cabinet, and controls the compressor so that the low-speed operation control is performed when the set temperature is lower than the low-frequency cooling temperature.

3. The temperature and humidity controlled cabinet according to claim 1, The control device controls the compressor so that the low-speed operation control is not performed when the set humidity is equal to or higher than the low-frequency dehumidification humidity set as the humidity at which dehumidification in the storage compartment is performed at a low frequency, and controls the compressor so that the low-speed operation control is performed when the set humidity is lower than the low-frequency dehumidification humidity.

4. The temperature and humidity controlled cabinet according to claim 1, The control device is characterized in that it controls the compressor so as not to perform low-speed operation control when the set temperature is equal to or higher than a low-frequency cooling temperature set as a temperature at which cooling is performed in the storage cabinet in a low frequency, and when the set humidity is equal to or higher than a low-frequency dehumidification humidity set as a humidity at which dehumidification is performed in the storage cabinet in a low frequency.

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