TWI644064B - Dehumidifier - Google Patents

Abstract

The dehumidification efficiency of the process air in the dehumidifier is improved by the improvement of the condensation efficiency of the regeneration air.

The dehumidifier (2) is provided with a process air path (4), a main fan (18), a dehumidification runner (14), a regeneration air path (6), a regenerative fan (20), a heater (22), and a main heat. An exchanger (12) and a secondary heat exchanger (16). The main heat exchanger (12) is by passing the process air before the dehumidification rotor (14) in the air path (4) and the regeneration air before passing through the heater (22) in the regeneration air path (6). Heat exchange is performed to cool the above regeneration air. The secondary heat exchanger (16) is passed through the process air after the dehumidification rotor (14) in the air path (4), and after passing through the dehumidification wheel (14) in the regeneration air path (6) The regeneration air before the first heat exchanger is heat-exchanged to cool the regeneration air.

Description

dehumidifier

The present invention relates to a dehumidifier.

In the dehumidifier, there is a type in which air (treatment air) is taken in and dehumidified by a dehumidifier in the dehumidifier and then exhausted. The moisture-removing dehumidification wheel is capable of continuously dehumidifying the process air by releasing moisture into the high-temperature regeneration air heated by the heater. Therefore, in such a dehumidifier, there are provided a path in which the two types of air flow are the process air for dehumidification and the regeneration air for regenerating (drying) the dehumidification wheel.

In the dehumidifier disclosed in Patent Document 1, heat exchange is performed between the process air and the regeneration air. The regenerative air is heated by the heater, and the moisture of the dehumidification runner is recovered to become high temperature and high humidity. The high-temperature, high-humidity regeneration air is cooled and condensed by heat exchange with the process air before passing through the dehumidification rotor in the first heat exchanger. The moisture of the condensed regeneration air is recovered as condensed water. The low-temperature regeneration air after the water is recovered, in the second heat exchanger and after passing through the dehumidification runner The high temperature process air is heated by heat exchange and then heated by the heater to return to the dehumidification wheel.

As described above, in the dehumidifier of Patent Document 1, cooling and heating of the regeneration air are performed in the two heat exchangers. The first heat exchanger on the cooling side functions as a condenser, and condenses water from the regeneration air to recover the water. In the second heat exchanger on the heating side, the electric power of the heater is saved by heating the regeneration air in advance before the heater is heated.

However, in the dehumidifier of Patent Document 1, there is no particular consideration as to how the efficiency of condensing the reconditioning air is improved by using two heat exchangers to improve the dehumidification efficiency of the process air.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 3857809

An object of the present invention is to improve the dehumidification efficiency of the process air of the dehumidifier by increasing the condensation efficiency of the regeneration air.

According to a first aspect of the present invention, there is provided a dehumidifier comprising: a process air path having an intake port and an exhaust port, and a first wind The fan sucks the processing air in the processing air path from the air inlet, exhausts the air from the exhaust port, and dehumidifies the wheel, and absorbs moisture from the processing air and regenerates the air path through the dehumidification A part of the runner is formed by a closed path, and the second fan is configured to circulate the regeneration air in the regeneration air path and the heater in the circulation direction of the regeneration air in the regeneration air path. The heating air and the first heat exchanger are heated to pass through the process air before the dehumidification rotor in the air path and to pass the regeneration air before reaching the dehumidification wheel. The regeneration air before the heater in the path exchanges heat to cool the regeneration air, and the second heat exchanger is processed by the processing air after passing through the dehumidification rotor in the processing air path. Passing through the above-described dehumidification rotor in the regeneration air path and after the regeneration air before passing through the first heat exchanger Heat exchange to cool the above regeneration air.

According to the dehumidifier, since both the first heat exchanger and the second heat exchanger cool the regeneration air, the amount of condensed water recovered is increased, and the condensation efficiency of the regeneration air can be improved. Therefore, more moisture can be recovered from the dehumidification runner, and the regeneration efficiency (drying efficiency) of the dehumidification runner can be improved. As a result, more moisture can be drawn from the process air passing through the dehumidification wheel, and the dehumidification efficiency of the process air can be improved. Here, the process air is indoor air to be dehumidified, and the so-called regeneration air is air that circulates in the dehumidifier to regenerate the dehumidification wheel.

In the above dehumidifier, it is preferable that the processing air and the regeneration air enter the dehumidification rotor from the same direction with respect to the thickness direction of the dehumidification rotor.

According to this dehumidifier, since the process air and the regeneration air enter from the same side of the dehumidification rotor, the moisture absorption and regeneration (drying) of the dehumidification wheel can be efficiently performed, and the dehumidification efficiency can be improved. In the dehumidification rotor, the moisture content of the surface (entry surface) and the detachment surface (release surface) where the treatment air enters is different. Specifically, the entry surface has a large amount of water content with respect to the release surface. This is because the process air is slowly absorbed when passing through the dehumidification rotor from the entry surface toward the release surface. Therefore, by setting the reconditioning air to enter from the inlet surface having a large water content, it is possible to recover more moisture of the dehumidification rotor, and the regeneration efficiency of the dehumidification rotor can be improved.

It is preferable that the first heat exchanger and the second heat exchanger are condensers that condense the regeneration air.

According to this dehumidifier, since the condensation of the regeneration air is performed in advance in the second heat exchanger, condensation can be performed throughout the cooling process of the first heat exchanger. Therefore, the condensation efficiency of the regeneration air can be further improved, and the dehumidification efficiency of the treatment air can be improved.

According to the present invention, since both the first heat exchanger and the second heat exchanger cool the regeneration air, the condensation efficiency of the regeneration air is improved, and the dehumidification efficiency of the treatment air can be improved.

2‧‧‧Dehumidifier of this embodiment

4‧‧‧Processing air path

4a‧‧‧1st treatment air path

4b‧‧‧2nd treatment air path

4c‧‧‧3rd treatment air path

4d‧‧‧4th treatment air path

6‧‧‧Regeneration air path

6a‧‧‧1st regenerative air path

6b‧‧‧2nd regeneration air path

6c‧‧‧3rd regenerative air path

6d‧‧‧4th regeneration air path

8‧‧‧ Intake port

10‧‧‧Exhaust port

12‧‧‧Main heat exchanger (1st heat exchanger)

14‧‧‧Dehumidification runner

16‧‧‧Sub heat exchanger (second heat exchanger)

18‧‧‧Main fan (1st fan)

20‧‧‧Regeneration fan (2nd fan)

22‧‧‧heater

Fig. 1 is a system diagram of a dehumidifier according to an embodiment of the present invention.

Fig. 2 is a system diagram of a conventional dehumidifier.

Fig. 3 is a wet air diagram of the dehumidifier and the conventional dehumidifier in the embodiment of the present invention.

[Formation of the Invention]

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

Fig. 1 is a system diagram of a dehumidifier 2 according to an embodiment of the present invention. The configuration of the dehumidifier 2 will be described with reference to Fig. 1 .

The dehumidifier 2 draws air (process air) to the outside (for example, a room to be dehumidified), and dehumidifies to exhaust. The dehumidifier 2 has a process air path 4 and a regeneration air path 6. Inside the process air path 4, process air as a dehumidification object flows. Inside the regeneration air path 6, regenerative air flows.

The treatment air path 4 is connected from the intake port 8 of the dehumidifier 2 to the exhaust port 10. In the processing air path 4, a main heat exchanger (first heat exchanger) 12, a dehumidification rotor 14, a sub heat exchanger (second heat exchanger) 16, and a main fan (first fan) 18 are disposed. . Further, the processing air path 4 is made up of the first processing air path 4a and the second processing space. The gas path 4b, the third process air path 4c, and the fourth process air path 4d are formed. The first process air path 4a is connected from the intake port 8 to the main heat exchanger 12. The second process air path 4b is connected from the main heat exchanger 12 to the dehumidification wheel 14. The third process air path 4c is connected from the dehumidification rotor 14 to the sub heat exchanger 16. The fourth process air path 4d is connected from the sub heat exchanger 16 to the exhaust port 10, and the main fan 18 is disposed on the path. Therefore, from the intake port 8 toward the exhaust port 10, the main heat exchanger 12, the dehumidification rotor 14, the sub heat exchanger 16, and the main fan are disposed in order along the flow direction of the process air. 18. The process air is sucked from the intake port 8 by the main fan 18, passes through the main heat exchanger 12, the dehumidification rotor 14, and the sub heat exchanger 16 in order, and is then exhausted by the exhaust port 10. However, the arrangement of the main fan 18 is not particularly limited to be disposed on the fourth process air path 4d, as long as the process air can flow from the intake port 8 to the exhaust port 10, and is disposed on the process air path 4 A location is fine.

The dehumidification rotor 14 is a moisture absorbing material containing zeolite or the like for absorbing moisture (hygroscopic) from the process air passing through the rotor. Since the dehumidification rotor 14 can absorb moisture as a whole and uniformly, it has a disk shape and is pivotable at the center. For example, a motor-like driving means is provided, whereby the dehumidification rotor 14 is rotationally driven.

The regeneration air path 6 is a closed path, and a regeneration fan (second fan) 20 is provided on the regeneration air path 6. The regeneration fan 20 regenerates the air and circulates inside the regeneration air path 6. In the regeneration air path 6, a regeneration fan 20, a heater 22, and The dehumidification rotor 14, the sub heat exchanger 16, and the main heat exchanger 12. Further, the regeneration air path 6 is formed by the first regeneration air path 6a, the second regeneration air path 6b, the third regeneration air path 6c, and the fourth regeneration air path 6d. The first regeneration air path 6a is connected from the main heat exchanger 12 to the heater 22, and the regeneration fan 20 is disposed on the path. The second regeneration air path 6b is connected from the heater 22 to the dehumidification rotor 14. The third regeneration air path 6c is connected from the dehumidification rotor 14 to the sub heat exchanger 16. The fourth regeneration air path 6d is connected from the sub heat exchanger 16 to the main heat exchanger 12. Therefore, in the circulation direction of the regeneration air, the regeneration fan 20, the heater 22, the dehumidification rotor 14, the sub heat exchanger 16, and the main heat exchanger 12 are disposed in this order. The regeneration air is circulated by sequentially passing the heater 22, the dehumidification rotor 14, the sub-heat exchanger 16, and the main heat exchanger 12, and then returning to the heater 22 again. However, the arrangement of the regenerative fan 20 is not particularly limited as long as it is disposed at any position on the regeneration air path 6.

The heater 22, for example, an electric heater, is used to heat the regeneration air entering the dehumidification rotor 14 to a predetermined temperature. The heater 22 is disposed immediately before the dehumidification rotor 14 is reached.

The main heat exchanger 12 exchanges heat between the process air before passing through the dehumidification rotor 14 of the first process air path 4a and the regeneration air before passing through the heater 22 of the fourth regeneration air path 6d. The process air in the first process air path 4a passes through the air before the dehumidification wheel 14 after inhaling from the intake port 8, so the temperature thereof is low in the entire system. Therefore, in the main heat exchanger 12, The process air is heated and the regeneration air is cooled.

The sub heat exchanger 16 is the process air after passing through the dehumidification rotor 14 of the third process air path 4c, and after the dehumidification wheel 14 passing through the third regeneration air path 6c and before and after passing through the main heat exchanger 12. Heat exchange between the air. The regeneration air in the third regeneration air passage 6c is the regeneration air that has passed through the second regeneration air passage 6b and the dehumidification rotor 14 after being heated by the heater 22. Since the amount of heat generated by the heater 22 is large, the temperature of the regeneration air in the third regeneration air path 6c is higher than the process air in the third process air path 4c. Therefore, in the sub heat exchanger 16, also the process air is heated and the regeneration air is cooled.

Next, the action of the dehumidifier 2 will be described with reference to Fig. 1.

The process air is heated in the main heat exchanger 12 via the first process air path 4a after the air is taken in from the intake port 8. The heated process air flows through the second process air path 4b to the dehumidification rotor 14. In the dehumidification rotor 14, the process air is dehumidified to remove moisture. The treated air after dehumidification flows to the sub heat exchanger 16 via the third process air path 4c. In the sub heat exchanger 16, the process air is also heated. The heated process air is exhausted from the exhaust port 10 via the fourth process air path 4d and then through the main fan 18.

The regeneration air is circulated in the regeneration air path 6. The regeneration air is heated by the heater 22 by the regeneration fan 20, and then flows to the dehumidification rotor 14 via the second regeneration air path 6b. In the dehumidification rotor 14, high-temperature regeneration air is sucked from the dehumidification wheel 14 The moisture removal is performed to absorb moisture to regenerate the dehumidification rotor 14. The regeneration air that has been absorbed by the dehumidification rotor 14 flows through the third regeneration air passage 6c to the sub heat exchanger 16. In the sub heat exchanger 16, the regeneration air is cooled. A portion of the regenerated air that has been cooled is thus condensed. The moisture of the condensed regeneration air is recovered as condensed water. The cooled regeneration air flows to the main heat exchanger 12 via the fourth regeneration air passage 6d. In the main heat exchanger 12, the regeneration air is also cooled. Similarly to the sub-heat exchanger 16, a part of the cooled regeneration air is condensed, and the condensed regeneration air is condensed and recovered. The regenerated air that has been cooled flows through the first regeneration air passage 6a and then passes through the regeneration fan 20 to the heater 22. Then repeat these effects.

As described above, in both of the first heat exchanger and the second heat exchanger, the regeneration air is cooled and condensed. In particular, in the sub-heat exchanger 16, by partially condensing (pre-condensing) a part of the regeneration air before flowing into the main heat exchanger 12, the entire cooling process of the main heat exchanger 12 becomes a condensation phenomenon. As described above, in the dehumidifier 2 of the present embodiment, the condensation efficiency of the main heat exchanger 12 is maximized. Therefore, the recovery amount of the condensed water is increased, and the condensation efficiency of the regeneration air can be increased, whereby more moisture can be recovered from the dehumidification runner, and the regeneration efficiency of the dehumidification runner can be improved. Therefore, it is possible to extract more moisture from the process air passing through the dehumidification rotor, and it is possible to improve the dehumidification efficiency of the process air.

In order to further improve the dehumidification efficiency, the process air and the regeneration air are configured to enter the thickness direction of the dehumidification rotor 14 from the same direction. In the dehumidification wheel 14, in the face where the air is processed (into The amount of moisture contained in the surface and the detached surface (the detachment surface) is different. Specifically, the dehumidification rotor 14 has a moisture content of more than the exit surface. This is because the process air is slowly absorbed when passing through the dehumidification rotor 14 from the entry surface toward the release surface. Therefore, by setting the reconditioning air to enter from the inlet surface having a large water content, the moisture of the dehumidification rotor 14 can be recovered, and the regeneration efficiency of the dehumidification rotor 14 can be improved.

A system of the conventional dehumidifier 3 disclosed in Patent Document 1 will be described below.

Fig. 2 is a system diagram of a conventional dehumidifier 3. In order to compare with this embodiment, the configuration of the conventional dehumidifier 3 will be described below with reference to Fig. 2 . The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The configuration of the processing air path 4 is the same as that of the dehumidifier 2 of the present embodiment.

The regeneration air path 6 is the same as the dehumidifier 2 of the present embodiment except for the circulation direction of the regeneration air flowing inside, and the positions of the heater 22 and the regeneration fan 20. Specifically, in the circulation direction of the regeneration air, the heater 22, the dehumidification rotor 14, the main heat exchanger 12, the sub heat exchanger 16, and the regeneration fan 20 are disposed in this order. The regeneration air is circulated by sequentially passing the heater 22, the dehumidification rotor 14, the main heat exchanger 12, and the sub heat exchanger 16, and then returning to the heater 22 again.

The main heat exchanger 12 is at: through the process air path 4 Heat exchange is performed between the process air before the dehumidification rotor 14 and the regeneration air after passing through the dehumidification rotor 14 of the regeneration air path 6. Since the treated air passes through the air before the humidifying rotor 14 after being sucked from the intake port 8, the temperature thereof is low in the entire system. Therefore, in the main heat exchanger 12, the process air is heated and the regeneration air is cooled.

The sub-heat exchanger 16 performs heat exchange between the process air after passing through the dehumidification rotor 14 of the process air path 4 and the regeneration air before passing through the heater 22 of the regeneration air path 6. The regeneration air is regenerative air that has passed through the main heat exchanger 12 and is exchanged with the low-temperature process air in the system. On the other hand, the process air is heated by the main heat exchanger 12 and the dehumidification rotor 14. Therefore, by processing the process air after the dehumidification rotor 14 of the air path 4, the temperature is higher than the regeneration air before the heater 22 passing through the regeneration air path 6. Therefore, in the sub heat exchanger 16, the process air is cooled and the regeneration air is heated.

Next, the action of the conventional dehumidifier 3 will be described with reference to Fig. 2 .

The process air is heated in the main heat exchanger 12 after the air is taken in from the intake port 8. The heated process air flows to the dehumidification rotor 14. In the dehumidification rotor 14, the process air is dehumidified to remove moisture. The treated air after dehumidification flows to the sub heat exchanger 16. In the sub heat exchanger 16, the process air is cooled. The cooled process air is exhausted from the exhaust port 10 by the main fan 18.

The regeneration air is circulated in the regeneration air path 6. The regeneration air is heated in the heater 22 and then flows to the dehumidification rotor 14. In the dehumidification rotor 14, the high-temperature regeneration air absorbs moisture from the dehumidification rotor 14 to absorb moisture to regenerate the dehumidification rotor 14. The regeneration air after the dehumidification rotor 14 absorbs moisture flows toward the main heat exchanger 12. In the main heat exchanger 12, the regeneration air is cooled. A portion of the regenerated air that has been cooled is thus condensed. The moisture of the condensed regeneration air is recovered as condensed water. The cooled regeneration air flows to the sub heat exchanger 16. In the sub heat exchanger 16, the regeneration air is heated. The heated regeneration air flows through the regeneration fan 20 to the heater 22. Then repeat these effects.

The treatment air and the regeneration air are configured to enter the thickness direction from different directions with respect to the dehumidification rotor 14. Therefore, the regeneration efficiency of the dehumidification rotor 14 is lower than the case of entering from the same direction.

The difference between the dehumidifier 2 of the present embodiment and the conventional dehumidifier 3 will be described with reference to FIG.

Fig. 3 is a wet air diagram showing the regeneration air of the dehumidifier 2 of the present embodiment and the conventional dehumidifier 3. The dehumidifier 2 of the present embodiment is indicated by a solid line, and the conventional dehumidifier 3 is indicated by a broken line. The vertical axis in the drawing shows the absolute humidity (water content) and the horizontal axis shows the display temperature.

When referring to Fig. 1 together, it is displayed at the point of the system diagram in Fig. 1 and the symbol corresponding to the point in the wet air line diagram of Fig. 3. The regeneration air of the dehumidifier 2 of the present embodiment is heated by the heater 22, and its temperature becomes maximum in the circulation path (point X ₁ ). The moisture in the dehumidification rotor 14 is absorbed by the dehumidification rotor 14, and its absolute humidity becomes maximum (point X ₂ ). The sub-heat exchanger 16 is cooled and partially condensed (point X ₃ ) beyond the dew point (point X ₂ '). The point X ₂ ' and the point X _{3 here} are on a curve indicating saturation humidity, on which the relative humidity is 100%. Therefore, condensation occurs on the curve as long as the temperature is lowered. Then, the main heat exchanger 12 is further cooled and condensed, and its absolute humidity is the lowest (point X ₄ ). Then, by heating by the heater 22, the temperature is again maximized (point X ₁ ).

As described above, both of the main heat exchanger 12 and the sub heat exchanger 16 condense the regeneration air. Therefore, the amount of recovery of the condensed water is increased, and the condensation efficiency of the regeneration air can be increased. Therefore, more moisture can be recovered from the dehumidification rotor 14, and the regeneration efficiency of the dehumidification rotor 14 can be improved.

In the sub-heat exchanger 16, even if the condensation is not reached, only the temperature is lowered (point X ₂ - point X ₃ '). In this case, in the main heat exchanger 12, after the temperature is lowered to the dew point (point X ₃ '-point X ₂ '), the regeneration air is condensed (point X ₂ '-point X ₄ ). Further, heat is dissipated in the fourth reconditioning air passage 6d from the sub heat exchanger 16 to the main heat exchanger 12, and the temperature of the reconditioning air may be lowered to the dew point (point X ₃ '-point X ₂ '). In this case, in the main heat exchanger 12, the regeneration air is condensed in the entire process of cooling (point X ₂ '-point X ₄ ). Further, in the sub-heat exchanger 16, the temperature of the regeneration air may be lowered to the dew point (point X ₂ - point X ₂ '). In this case, similarly, the sub-heat exchanger 16 does not condense, but in the main heat exchanger 12, the reconditioning air is condensed during the entire cooling process (point X ₂ '-point X ₄ ). It is carried out in such a manner that the condensation efficiency of the main heat exchanger 12 can be improved.

When the reference is made to Fig. 2, it is indicated by the point in the system diagram of Fig. 2, and the point corresponding to the point in the wet air line diagram of Fig. 3. In the conventional dehumidifier 3, the regeneration air is heated by the heater 22, and its temperature becomes maximum in the circulation path (point Y ₁ ). The moisture in the dehumidification rotor 14 is absorbed by the dehumidification rotor 14, and its absolute humidity becomes maximum (point Y ₂ ). When the main heat exchanger 12 passes through the dew point (point Y ₂ '), it is cooled and condensed, and its absolute humidity is the lowest (point Y ₃ ). The point Y ₂ ' and the point Y _{3 here} are on the curve indicating the saturation humidity. Since the curve indicating the saturation humidity is determined by the physical property value of the regeneration air, the present embodiment is common to the saturation humidity curve of the conventional example. Thereafter, the sub-heat exchanger 16 is heated to raise the temperature (point Y ₄ ). Then, by heating by the heater 22, the temperature is again maximized (point Y ₁ ).

The difference between the present embodiment and the conventional example will be described. In the dehumidifier 2 of the present embodiment, the sub-heat exchanger 16 is cooled with respect to the regeneration air, and the conventional dehumidifier 3 is heated. In the dehumidifier 2 of the present embodiment, before the condensation by the main heat exchanger 12, the condensation is performed in advance (point X ₂ '-point X ₃ ) so that a part of the regeneration air starts to condense. By doing so, the regeneration air flowing into the main heat exchanger 12 is already on the saturation humidity curve (point X ₃ ), and condensation occurs at the same time as the temperature is lowered (point X ₃ - point X ₄ ). However, in the conventional dehumidifier 3, the regeneration air that has been absorbed by the dehumidification rotor 14 is not condensed beforehand and flows into the main heat exchanger 12. Therefore, there must be a certain amount of cooling (point Y ₂ - point Y ₂ ') before starting condensation. Therefore, the conventional dehumidifier 3 has a smaller amount of condensation (H _X >H _Y ) than the dehumidifier 2 of the present embodiment. Further, as described above, even when condensation does not occur in the sub-heat exchanger 16 (point X ₂ - point X ₃ ' or point X ₂ - point X ₂ '), it is improved compared to the past. Condensation efficiency. Therefore, compared with the conventional dehumidifier 3, the temperature reduction amount (point Y ₂ - point Y ₂ ') at which the main heat exchanger 12 is condensed is formed, and the dehumidifier 2 of the present embodiment is required to reach a temperature decrease amount of condensation (point X ₃ '-point X ₂ ' or zero) is less, so condensation can be performed efficiently.

Further, as shown in FIGS. 1 and 2, the present embodiment differs from the prior art in the entry direction of the process air and the regeneration air with respect to the dehumidification rotor 14. As described above, in order to absorb moisture from the dehumidification rotor 14 to absorb moisture, it is advantageous to enter the same direction with respect to the dehumidification rotor 14. For this point, as seen in Fig. 3, the inclination of the straight line from the point X _{1 to the} point X ₂ and the inclination of the straight line from the point Y _{1 to the} point Y _{2 are} straight lines from the point X _{1 to the} point X ₂ . Tilt is large. It can be seen that since a certain degree of temperature drop is formed by the regeneration air passing through the dehumidification rotor 14, the situation in which the inclination is large is to absorb more moisture.

Further, the dehumidifier of the present invention includes, for example, indoor air as a dehumidification target for drying indoors, and moisture for clothing for drying purposes, or for achieving both of them. Target person.

Claims (3)

A dehumidifier characterized by comprising: a process air passage having an intake port and an exhaust port, and a first fan that sucks process air in the process air path from the intake port and performs the process air from the exhaust port The exhaust gas and the dehumidification rotor are configured to absorb moisture from the processing air and to regenerate the air path, and pass through a part of the dehumidification rotor, and are formed by a closed path and a second fan to drive the regeneration air path. The regeneration air circulation and the heater are arranged in the circulation direction of the regeneration air in the regeneration air passage so as to reach the front of the dehumidification rotor, and to heat the regeneration air and the first heat exchanger. Cooling the reconditioning air by heat exchange with the reconditioning air before passing through the heater in the reconditioning air path by the processing air before the dehumidification rotor in the processing air path a heat exchanger which passes the above-mentioned process air after passing through the above-described dehumidification runner in the air path, and passes through the above-mentioned regeneration air The regeneration air is cooled after the dehumidification rotor in the gas path and after the heat exchange by the regeneration air before the first heat exchanger. The dehumidifier according to claim 1, wherein the processing air and the regeneration air enter the dehumidification rotor from the same direction with respect to a thickness direction of the dehumidification rotor. The dehumidifier according to claim 1 or 2, wherein the first heat exchanger and the second heat exchanger are condensers that condense the regeneration air.