JP7530236B2 - Dehumidifier - Google Patents

Description

The present invention relates to a dehumidifier.

For example, Patent Document 1 discloses a dehumidifier with a dehumidifying function.

International Publication No. WO2009/087734

The dehumidifier described in the cited document 1 includes a main body case, a refrigeration cycle mechanism, a blower, and a dehumidification rotor having a moisture release section and a dehumidification section. A heating section is provided between a radiator in the refrigeration cycle mechanism and the moisture release section of the dehumidification rotor. The moisture release section of the dehumidification rotor is heated by air heated by the heating section, and moisture is released in the moisture release section. For example, in this dehumidifier, even when the moisture release amount in the moisture release section decreases and it becomes difficult to release moisture even when the moisture release section is heated, heating by the heating section is still performed, which may increase power consumption.
A main object of the present disclosure is to provide, for example, a dehumidifier that can save energy.

A dehumidifier according to one embodiment of the present disclosure includes a heating unit, a moisture release unit that is heated by the heating unit and releases moisture, a first moisture detection unit that detects a first moisture content in air that has passed through the moisture release unit, and a heating unit control unit that controls the heating unit based on the first moisture content.

1 is a perspective view of an example of a dehumidifier according to a first embodiment. FIG. FIG. 2 is a schematic diagram showing the inside of the dehumidifier of FIG. 1 . FIG. 3 is a cross-sectional view taken along line III-III of FIG. FIG. 2 is a schematic diagram of the dehumidifier of FIG. 1 as viewed from the rear. 2 is a diagram illustrating an example of a functional configuration of a control unit in the dehumidifier of the first embodiment. FIG. FIG. 1 is a diagram showing an example of a flow of processing by the dehumidifier of the first embodiment; FIG. 11 is a diagram illustrating an example of a functional configuration of a control unit in a dehumidifier according to a second embodiment. FIG. 13 is a diagram showing an example of a flow of processing by a dehumidifier according to a second embodiment;

The embodiments described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments described below.

First Embodiment
An example of a dehumidifier according to a first embodiment will be described with reference to Figures 1 to 4. Figure 1 is a perspective view of a dehumidifier 100 according to a first embodiment. Figure 2 is a schematic diagram showing the inside of the dehumidifier 100. Figure 3 is a cross-sectional view of the dehumidifier 100 shown in Figure 2 taken along line III-III. Figure 4 is a schematic diagram of the dehumidifier 100 as viewed from the rear.

As shown in FIG. 1, the dehumidifier 100 includes a casing 1, a cover member 2a, a drainage tank 4, and an operating unit 5.

The casing 1 is a hollow member. The casing 1 is formed with an air outlet 2 and a pair of first air inlets 3a (see Figure 3).

The air outlet 2 is formed on the front surface of the casing 1. The air outlet 2 connects the inside and outside of the casing 1. The air outlet 2 releases air inside the casing 1 to the outside of the casing 1. The air outlet 2 only needs to be formed in the casing 1, and may be located in a location other than the front surface of the casing 1.

The cover member 2a is a generally plate-shaped member. In FIG. 1, the cover member 2a covers the air outlet 2. The cover member 2a is rotatably attached to the casing 1. By changing the rotation angle, the cover member 2a functions as a wind direction plate that determines the flow direction of the air discharged from the air outlet 2 according to the rotation angle of the cover member 2a.

The first suction port 3a is formed on the rear surface of the casing 1. The first suction port 3a connects the inside and outside of the casing 1. Air outside the casing 1 flows into the inside of the casing 1 through the first suction port 3a. The first suction port 3a only needs to be formed in the casing 1, and may be located in a location other than the rear surface of the casing 1.

The drainage tank 4 is removably stored in the casing 1. The drainage tank 4 stores the water generated by the dehumidifier 100.

The operation unit 5 is provided on the top of the casing 1. The operation unit 5 receives instructions from the outside. For example, the dehumidifier 100 is set to stop operation when the humidity in the room where the dehumidifier is installed drops to a predetermined humidity level after starting operation as received from the operation unit 5. Furthermore, the dehumidifier 100 may be set to resume operation when the humidity level rises to the predetermined humidity level.

Next, the dehumidifier 100 will be further described with reference to Figures 2 to 4. Note that the up-down direction is a direction parallel to the vertical direction. The front-rear direction is a direction parallel to the horizontal direction. The left-right direction is a direction perpendicular to both the up-down direction and the front-rear direction.

As shown in Figures 2 to 4, the dehumidifier 100 further includes a heater 6, a dehumidification rotor 7, a cooling section 8, a heat dissipation section 9, a water collection section 10, a blower section 11, a compression section 12, and an expansion section (not shown).

The heater 6, the dehumidification rotor 7, the cooling section 8, the heat dissipation section 9, the air blower section 11, and the compression section 12 are arranged inside the casing 1 and are housed in the casing 1.

The heater 6 has a heating function of heating the air by generating heat. The heater 6 is, for example, an example of a heating unit that heats the dehumidification rotor 7.

The dehumidifying rotor 7 includes a dehumidifying member 71 such as zeolite, a rotor 72, and a rotating shaft 73. The rotor 72 is a substantially disk-shaped member. A plurality of dehumidifying members 71 are provided on the rotor 72 along the circumferential direction of the rotor 72. The rotor 72 rotates around the rotating shaft 73.

The dehumidifying rotor 7 further includes a moisture releasing section 7a and a moisture absorbing section 7b.

The moisture release section 7a is the upper part of the rotor 72. The moisture release section 7a is located above the moisture absorption section 7b. The first suction port 3a is located behind the moisture release section 7a. The moisture release section 7a faces the heater 6. The moisture release section 7a is located behind the heater 6. The moisture release section 7a is heated by heat supplied from the heater 6. More specifically, the moisture release section 7a is heated by being supplied with air heated by the heater 6.

The moisture absorbing section 7b is the lower part of the rotor 72. The moisture absorbing section 7b does not face the heater 6.

The moisture absorbing member 71 rotates together with the rotor 72, and alternates between being positioned in the moisture releasing section 7a and being positioned in the moisture absorbing section 7b.

The moisture absorbent section 7b dehumidifies the air. More specifically, the moisture absorbent member 71 located in the moisture absorbent section 7b dehumidifies the air. As a result, the dehumidified air is released from the moisture absorbent section 7b.

The moisture release section 7a has a moisture release function that releases moisture dehumidified by the moisture absorption section 7b by being supplied with air heated by the heater 6. In detail, the moisture release section 7a releases moisture by heating the moisture absorption member 71 located in the moisture release section 7a.

The relationship between the heater 6 and the moisture release section 7a will be explained.

The heater 6 includes, for example, a nichrome heater or a ceramic heater, and is powered by electricity. The heater 6 has a heating function according to the moisture release function of the moisture release section 7a. In other words, the heater 6 heats the air so that the temperature of the air supplied to the moisture release section 7a becomes a predetermined temperature. The predetermined temperature is a temperature at which the moisture absorbing member 71, such as zeolite, located in the moisture release section 7a can effectively perform its moisture release function. In the first embodiment, the heater 6 generates heat at, for example, about 200°C to 300°C, thereby heating the air so that the temperature of the air supplied to the moisture release section 7a becomes a predetermined temperature.

The compression section 12 compresses the refrigerant. The compression section 12 includes a compressor. The expansion section reduces the pressure of the refrigerant. The expansion section includes, for example, a capillary tube. A refrigeration cycle is formed inside the casing 1. The refrigeration cycle is a cycle in which a circulation path is formed by connecting the compression section 12, the heat dissipation section 9, the expansion section, and the cooling section 8 in a ring shape, and the compression section 12 circulates the refrigerant through the circulation path. In the refrigeration cycle, the compression section 12 operates to increase the temperature and pressure of the refrigerant. The high-temperature, high-pressure refrigerant is sent to the heat dissipation section 9. The heat dissipation section 9 cools the refrigerant by dissipating heat of the refrigerant into the air passing through the heat dissipation section 9. The refrigerant that has passed through the heat dissipation section 9 is sent to the expansion section. The expansion section reduces the pressure of the refrigerant cooled by the heat dissipation section 9 to generate a low-temperature, low-pressure refrigerant. The refrigerant that has passed through the expansion section is sent to the cooling section 8. The cooling section 8 is cooled by being supplied with low-temperature, low-pressure refrigerant from the expansion section. The refrigerant that passes through the cooling section 8 is sent to the compression section 12. In the refrigeration cycle, the refrigerant circulates through the compression section 12, the heat dissipation section 9, the expansion section, and the cooling section 8 in that order, suppressing a rise in temperature of the cooling section 8. In the refrigeration cycle, the heat dissipation section 9 is sent with high-temperature, high-pressure refrigerant from the compression section 12, so the temperature of the heat dissipation section 9 rises.

The cooling unit 8 cools the air. The cooling unit 8 includes an evaporator. The cooling unit 8 has a shape that extends in the vertical direction. The cooling unit 8 is disposed opposite the moisture absorption unit 7b. The cooling unit 8 is disposed behind the moisture absorption unit 7b.

The cooling unit 8 cools the air, causing the water vapor in the air to condense. As a result, the air is dehumidified and water is produced.

In the first embodiment, the air discharged from the moisture discharging section 7a is supplied to the cooling section 8. The cooling section 8 then generates condensation from the air discharged from the moisture discharging section 7a to perform dehumidification.

The heat dissipation unit 9 cools the cooling unit 8 by cooling the refrigerant in the refrigeration cycle. That is, the heat dissipation unit 9 cools the cooling unit 8 via the refrigerant (e.g., freon gas). The heat dissipation unit 9 includes a capacitor. The heat dissipation unit 9 is disposed in front of the moisture absorption unit 7b. The heat dissipation unit 9 is disposed below the heater 6.

The water collection section 10 collects the water generated in the cooling section 8. The water collection section 10 is disposed below the cooling section 8. The water generated in the cooling section 8 drips into the water collection section 10.

The water collection section 10 is formed, for example, in a funnel shape, and guides the supplied water to the drainage tank 4. As a result, the water is stored in the drainage tank 4.

The blower 11 blows air. The blower 11 includes a fan. The blower 11 is disposed in front of the heat dissipation section 9.

The dehumidifier 100 further includes a memory unit 13 and a control unit 14. The memory unit 13 and the control unit 14 can constitute a computer.

The memory unit 13 includes a main memory device (e.g., a semiconductor memory) such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and may further include an auxiliary memory device (e.g., a hard disk drive). The main memory device and/or the auxiliary memory device store various computer programs executed by the control unit 14. The memory unit 13 also operates as a work memory for the control unit 14. The memory unit 13 can constitute a storage medium that records computer-readable computer programs.

The control unit 14 includes a processor such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit). The control unit 14 controls each element of the dehumidifier 100. In addition, all or part of the processing performed by the control unit 14 may be performed by hardware.

The dehumidifier 100 further includes a first moisture detection unit 16 and a second moisture detection unit 17.

The first moisture detection unit 16 and the second moisture detection unit 17 detect, for example, the amount of moisture contained in the air.

The first moisture detection unit 16 detects, for example, a first moisture amount in air that has passed through the moisture release unit 7a. More specifically, the first moisture detection unit 16 detects, for example, a first moisture amount in air that has passed through the heater 6 and then through the moisture release unit 7a. The first moisture detection unit 16 is, for example, disposed between the moisture release unit 7a and the cooling unit 8 in the air passage F1 described below. The first moisture detection unit 16 is, for example, a humidity sensor. The first moisture detection unit 16 may have a function of detecting temperature, for example, and may be configured to detect relative humidity.

The second moisture detection unit 17 detects the second moisture content in the air before it passes through the moisture release unit 7a. More specifically, the second moisture detection unit 17 detects, for example, the moisture content of the air taken in through the first suction port 3a. The second moisture detection unit 17 is disposed, for example, between the first suction port 3a and the heater 6 in the air duct F1 described below. Note that the second moisture detection unit 17 only needs to be able to detect the moisture content in the air taken in by the dehumidifier 100, and may be provided, for example, outside the casing 1. The second moisture detection unit 17 is, for example, a humidity sensor. The second moisture detection unit 17 may have a function of detecting temperature, for example, and may be configured to detect relative humidity.

Next, we will explain the air passage F1 formed inside the casing 1 with reference to Figures 2 to 4.

The air passage F1 is a portion through which air passes inside the casing 1, which is formed by the blower 11 blowing air. The air passage 1 includes a pair of first air passage portions F11, a second air passage portion F12, a third air passage portion F13, a fourth air passage portion F14, a fifth air passage portion F15, and a sixth air passage portion F16. The air taken in from the outside of the casing 1 by the blower 11 through the first intake port 3a passes through the first air passage portion F11, the second air passage portion F12, the third air passage portion F13, the fourth air passage portion F14, the fifth air passage portion F15, and the sixth air passage portion F16 in this order, and is discharged to the outside of the casing 1 from the air outlet 2. The air passage F1 is formed, for example, by being partitioned by a plurality of walls 15a to 15f provided inside the casing 1. The multiple walls 15a to 15f are, for example, plate-shaped members made of metal, resin, etc.

In the air passage F1, air flows in the following order: heater 6, moisture release section 7a, cooling section 8, moisture absorption section 7b, heat dissipation section 9, and blower section 11.

Figure 5 is a diagram showing an example of the functional configuration of the control unit 14 in the dehumidifier 100 according to this embodiment. As shown in Figure 5, the control unit 14 of the dehumidifier 100 functionally includes, for example, a first moisture amount acquisition unit 601 and a heating unit control unit 602.

The first moisture content acquisition unit 601 acquires the first moisture content detected by the first moisture detection unit 16.

The heating unit control unit 602 controls the heater 6 based on the first moisture content. More specifically, the heating unit control unit 602 stops the heater 6 when, for example, the first slope, which represents the amount of decrease in the first moisture content per unit time, becomes equal to or less than a set value. As described above, the first slope means the time change rate or time change coefficient.

The first moisture content acquisition unit 601 and the heating unit control unit 602 are realized, for example, by a processor executing a computer program.

When the first inclination becomes equal to or less than a set value, it indicates, for example, that the amount of moisture that can be released from the moisture release section 7a has decreased, and the amount of moisture absorbed by the moisture absorption section 7b has decreased, and dehumidification by the dehumidification rotor 7 is no longer necessary. By stopping the heater 6 in such a situation, energy can be saved. Furthermore, if heating is continued even though the amount of moisture in the moisture release section 7a has decreased, the moisture release section 7a may overheat and the dehumidification rotor 7 may be damaged. Therefore, by stopping the heater 6 as described above, damage to the dehumidification rotor 7 can be suppressed. In addition, the rotation of the dehumidification rotor 7 may be stopped at the same time as stopping the heater 6. This can further save energy. The set value is not particularly limited, and may be a value determined in advance by experiments, etc.

For example, if the first moisture detection unit 16 is a humidity sensor that detects relative humidity, the heating unit control unit 602 can calculate the first moisture content from the temperature and relative humidity detected by the first moisture detection unit 16.

Next, an example of the process flow in the dehumidifier 100 of this embodiment will be described. Figure 6 is a diagram showing an example of the process flow in the dehumidifier 100 of this embodiment.

As shown in FIG. 6, the first moisture amount acquisition unit 601 acquires the first moisture amount (S101). More specifically, the first moisture amount acquisition unit 601 acquires, for example, the first moisture amount at a predetermined time detected by the first moisture detection unit 16. The first moisture amount acquisition unit 601 acquires the first moisture amount, for example, at predetermined time intervals (for example, every few seconds).

The heating unit control unit 602 calculates the first slope based on the first moisture content acquired by the first moisture content acquisition unit 601 (S102). More specifically, the heating unit control unit 602 calculates the first slope, which is expressed as the amount of decrease in the first moisture content per unit time, from the first moisture content at the above-mentioned predetermined time and the first moisture content at the next predetermined time. The method of calculating the first slope is not particularly limited, and the first slope may be calculated from, for example, the average value of the first moisture content acquired from the predetermined time to a predetermined time several times before (for example, 10 times) and the average value of the first moisture content acquired from the next predetermined time to a predetermined time several times before (for example, 10 times).

The heating unit control unit 602 then determines, for example, whether the first slope is equal to or less than a set value (S103). If it is determined that the first slope is equal to or less than the set value (YES in S103), the heating unit control unit 602 stops the heater 6 (S104) and ends the process. On the other hand, if the first slope is greater than the set value (NO in S103), the process returns to S101. Note that the dehumidifier 100 stops operation, for example, when a predetermined humidity level is reached. In this way, when operation is stopped, the above process also ends, and the process is started when operation is resumed.

For example, when the dehumidifier 100 starts dehumidifying, the humidity in the room is high and dehumidification is performed in the moisture absorption section 7b of the dehumidification rotor 7. On the other hand, in the moisture release section 7a, moisture is released by heating the heater 6, so the amount of moisture released from the moisture release section 7a is large and the first slope changes little around 0. When the dehumidification of the room progresses to a certain extent, the amount of moisture in the air reaching the moisture absorption section 7b decreases due to dehumidification in the cooling section 8, so the amount of dehumidification in the moisture absorption section 7b also decreases, and the amount of moisture released in the moisture release section 7a also decreases. As the amount of moisture released in the moisture release section 7a decreases in this way, the first slope becomes large. Furthermore, as the dehumidification of the room progresses, the amount of moisture in the air reaching the moisture absorption section 7b further decreases due to dehumidification in the cooling section 8, making dehumidification in the moisture absorption section 7b difficult, and the amount of moisture released in the moisture release section 7a almost disappears. As such, when the amount of moisture released in the moisture release section 7a almost disappears, the first slope changes little around 0. That is, the first slope is approximately 0 at the beginning of the dehumidification, increases once, reaches a peak, and then approaches approximately 0. Therefore, by setting the first slope to a value between the peak and the time when it approaches approximately 0, it is possible to efficiently perform dehumidification by the dehumidification rotor 7 and to conserve energy.

The heating unit control unit 602 may be configured to determine, for example, whether or not there is a peak in the first slope, and to stop the heater 6 when the first slope after the peak reaches a set value. This allows the difficulty of dehumidification by the dehumidification rotor 7 to be determined more accurately, and allows efficient dehumidification by the dehumidification rotor 7.

The heating unit control unit 602 may be configured to stop the heater 6 when the first inclination reaches a set value after a certain dehumidification period from the start of dehumidification by the dehumidifier 100. This allows, for example, the dehumidification period from the start of dehumidification to the peak to be excluded, allowing efficient dehumidification by the dehumidification rotor 7.

Furthermore, the heating unit control unit 602 may be configured to stop the heater 6 when, for example, the first moisture content becomes equal to or less than a reference value. As a result, for example, when the first moisture content becomes equal to or less than the reference value, it can be determined that dehumidification by the dehumidification rotor 7 will not be performed, and efficient dehumidification by the dehumidification rotor 7 can be performed. Furthermore, if the heating unit control unit 602 is configured to stop the heater 6 when the reference value is reached and the slope becomes equal to or less than a set value, more efficient dehumidification by the dehumidification rotor 7 can be performed. Note that the reference value is not particularly limited, and may be a value determined in advance by experiments, etc.

Furthermore, the heating unit control unit 602 may be configured to stop the heater 6 when the first moisture content per unit time drops by a set amount, for example. For example, if the first moisture content drops suddenly by a set amount in a unit time of several seconds, the dehumidifying rotor 7 may not rotate, and the heater 6 may continue to heat the same part of the dehumidifying rotor 7 in the moisture releasing section 7a of the dehumidifying rotor 7. In this case, damage to the dehumidifying rotor 7 can be prevented by stopping the heater 6. The set amount is not particularly limited, and may be, for example, an amount determined by experiments or the like. Furthermore, as described above, if the first moisture content per unit time drops by a set amount, a warning may be given to the user of the dehumidifier 100, for example, by sound or display.

Second Embodiment
A dehumidifier 100 according to a second embodiment will be described with reference to the drawings. Fig. 7 is a diagram showing an example of a functional configuration of the control unit 14 in the dehumidifier 100 according to this embodiment. As shown in Fig. 7, the control unit 14 of the dehumidifier 100 functionally includes, for example, a first moisture amount acquisition unit 601, a heating unit control unit 602, and a second moisture amount acquisition unit 701. Note that in this embodiment, parts that are substantially the same as those in the first embodiment are given the same reference numerals, and detailed descriptions of the same parts may be omitted.

The second moisture amount acquisition unit 701 acquires the second moisture amount detected by the second moisture detection unit 17. In other words, the second moisture amount acquisition unit 701 acquires the second moisture amount in the air before it passes through the moisture release unit 7a.

The heating unit control unit 602 controls the heater 6 based on the first moisture content and the second moisture content. More specifically, the heating unit control unit 602 controls the heater 6 based on, for example, the difference between the first moisture content and the second moisture content at a set time. The difference is, for example, a value obtained by subtracting the second moisture content from the first moisture content. More specifically, the heating unit control unit 602 stops the heater 6 when, for example, a second slope represented by the amount of decrease in the difference per unit time becomes equal to or less than a set value. As described above, the second slope means a time change rate or a time change coefficient.

The first moisture content acquisition unit 601, the second moisture content acquisition unit 701, and the heating unit control unit 602 are realized, for example, by a processor executing a computer program.

Next, an example of the process flow in the dehumidifier 100 of this embodiment will be described. Figure 8 is a diagram showing an example of the process flow in the dehumidifier 100 of this embodiment.

As shown in FIG. 8, the first moisture content acquisition unit 601 acquires the first moisture content (S201). Note that S201 is the same as S101 described above.

The second moisture amount acquisition unit 701 acquires the second moisture amount (S202). More specifically, the second moisture amount acquisition unit 701 acquires, for example, the second moisture amount at a predetermined time detected by the second moisture detection unit 17. The second moisture amount acquisition unit 701 acquires the second moisture amount, for example, every predetermined time (for example, every few seconds). Note that the order of S201 and S202 is not particularly limited, and may be reversed or simultaneous, for example.

The heating unit control unit 602 calculates the second slope based on, for example, the first moisture content acquired by the first moisture content acquisition unit 601 and the second moisture content acquired by the second moisture content acquisition unit 701 (S203). More specifically, the heating unit control unit 602 calculates a difference (difference at a specified time) by subtracting the second moisture content at the specified time from the first moisture content at the specified time. Then, the heating unit control unit 602 calculates a second slope represented by the decrease in difference per unit time from the difference at the specified time and the difference at the next specified time. The method of calculating the second slope is not particularly limited, and the second slope may be calculated, for example, from the average value of the differences acquired from the specified time to a specified time several times before (for example, 10 times) and the average value of the differences acquired from the next specified time to a specified time several times before (for example, 10 times). The second slope means a time change rate or a time change coefficient.

The heating unit control unit 602 then determines, for example, whether the second slope is equal to or less than a set value (S204). If it is determined that the second slope is equal to or less than the set value (YES in S204), the heating unit control unit 602 stops the heater 6 (S205) and ends the process. On the other hand, if the second slope is greater than the set value (NO in S204), the process returns to S201. Note that the dehumidifier 100 stops operation, for example, when a predetermined humidity level is reached. In this way, when operation is stopped, the above process also ends, and the process is started when operation is resumed.

The difference between the first moisture amount and the second moisture amount corresponds to the moisture amount released from the moisture release section 7a. In other words, in this embodiment, the influence of the moisture amount contained in the air taken in from the outside in the first embodiment is eliminated, and the moisture absorption performance and moisture absorption limit of the dehumidification rotor 7 can be more accurately estimated. In other words, according to this embodiment, the amount of moisture released from the moisture release section 7a is derived more accurately, so that the limit of dehumidification by the dehumidification rotor 7 can be determined. This allows more efficient dehumidification by the dehumidification rotor 7 while saving energy. Furthermore, when it is determined that dehumidification by the dehumidification rotor 7 has reached its limit, the rotation of the dehumidification rotor 7 may be stopped, thereby further saving energy.

The present invention is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that provides the same action and effect, or a configuration that can achieve the same purpose.

100 Dehumidifier, 6 Heater (heating unit), 7 Dehumidification rotor, 7a Moisture release unit, 7b Moisture absorption unit, 8 Cooling unit, 9 Heat dissipation unit, 16 First moisture detection unit, 17 Second moisture detection unit, 602 Heating unit control unit, F1 Air passage

Claims (5)

A heating unit;
A moisture releasing section that is heated by the heating section and releases moisture;
a first moisture detector that detects a first moisture content in the air that has passed through the moisture release unit;
a second moisture detector configured to detect a second moisture content in the air before the air passes through the moisture release unit;
a heating unit control unit that controls the heating unit based on a difference between the first moisture amount and the second moisture amount at a set time;
Equipped with
The heating unit control unit stops the heating unit when a second gradient represented by an amount of decrease in the difference per unit time becomes equal to or smaller than a set value. The dehumidifier according to claim 1, wherein the heating unit control unit stops the heating unit when a first slope represented by the amount of decrease in the first moisture content per unit time becomes equal to or less than a set value. The dehumidifier according to claim 1 or 2, wherein the heating unit control unit stops the heating unit when the first moisture content per unit time decreases by a set amount. Further, a cooling section that cools the air that has passed through the moisture releasing section;
a heat dissipation section that cools the cooling section via a refrigerant;
A moisture absorbing section that dehumidifies the air;
an air passage through which air passes through the heating unit, the moisture releasing unit, the cooling unit, the moisture absorbing unit, and the heat releasing unit in this order;
The dehumidifier according to any one of claims 1 to 3, comprising: The dehumidifier according to claim 4, wherein the first moisture detection unit is provided between the moisture release unit and the cooling unit in the air passage.

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