CN221098844U - Dehumidification units and air handling systems - Google Patents

Abstract

A dehumidifying apparatus and an air-conditioning system including the same, which can quickly determine the effective length of a heat exchanger for dehumidification when the heat exchanger for air conditioning is used as the heat exchanger for dehumidification. The dehumidifying device of the present utility model comprises a housing having an air inlet and an air outlet connected to a ventilator by an air duct, wherein a first heat exchanger for heat exchange by a refrigerant and a drain pan located below the first heat exchanger are provided in the housing, and the first heat exchanger operates as an evaporator during dehumidifying operation, wherein the rated dehumidifying capacity of the first heat exchanger is set to D, the rated air volume of the ventilator is set to W, and the effective length of the first heat exchanger is set to L, and the relationship of 0.1 m W/D < L < 0.37 m W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is rice ³/min, and the unit of L is rice.

Description

Dehumidification units and air handling systems

Technical Field

The utility model relates to a dehumidification device and an air processing system comprising the dehumidification device.

Background technique

In the conventional dehumidification device, the heat exchanger for dehumidification that works as an evaporator during dehumidification operation is specially designed and is not shared with the heat exchanger for air conditioning (eg, reheat dehumidification air conditioning).

However, in order to reduce development costs, etc., it is possible to consider using the heat exchanger used for air conditioning as the heat exchanger for dehumidification in the dehumidification device. However, since the target capacity of the dehumidification device (the degree to which moisture in the air needs to be removed) is different from that of the air conditioner, the determination of the effective length of the heat exchanger for dehumidification in this case is more complicated.

Utility Model Content

The present utility model is completed in view of the above-mentioned problems, and aims to provide a dehumidification device and an air treatment system including the dehumidification device, which helps to quickly determine the effective length of the heat exchanger for dehumidification while suppressing the loss of supply air pressure when using the heat exchanger used for air conditioning as the heat exchanger for dehumidification.

In order to achieve the above-mentioned purpose, the utility model provides a dehumidification device, comprising a shell, the shell having an air inlet and an air outlet connected to a ventilation device through an air duct, a first heat exchanger for heat exchange using a refrigerant and a drain pan located below the first heat exchanger are arranged in the shell, the first heat exchanger works as an evaporator during dehumidification operation, wherein, when the rated dehumidification capacity of the first heat exchanger is set to D, the rated air volume of the ventilation device is set to W, and the effective length of the first heat exchanger is set to L, the relationship of 0.1 m*W/D＜L＜0.37 m*W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter.

According to the dehumidification device of the present invention, when the rated dehumidification capacity of the first heat exchanger is set to D, the rated air volume of the ventilation device is set to W, and the effective length of the first heat exchanger is set to L, the relationship of 0.1m*W/D＜L＜0.37Wm*/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter. Therefore, when the heat exchanger used for air conditioning is used as the first heat exchanger, it is helpful to quickly determine the effective length of the heat exchanger for dehumidification while suppressing the loss of air supply pressure.

In addition, in the dehumidifier of the present invention, it is preferred that the dehumidifier further comprises a first refrigerant piping port and a second refrigerant piping port respectively connected to the first heat exchanger, the outer diameter of the first refrigerant piping port is larger than the outer diameter of the second refrigerant piping port, and a regulating valve capable of adjusting the opening is provided between the first heat exchanger and the second refrigerant piping port. Here, the first refrigerant piping port is usually a gas-side refrigerant piping connection port, and the second refrigerant piping port is usually a liquid-side refrigerant piping connection port.

In addition, in the dehumidification device of the present invention, a second heat exchanger for heat exchange using refrigerant is preferably provided in the shell, the second heat exchanger is located downstream of the first heat exchanger and works as a condenser during dehumidification operation, the first heat exchanger and the second heat exchanger are respectively fin-tube heat exchangers, and the number of fin rows of the second heat exchanger is less than the number of fin rows of the first heat exchanger.

According to the dehumidification device of the utility model, a second heat exchanger for heat exchange using refrigerant is arranged in the shell. The second heat exchanger is located downstream of the first heat exchanger and works as a condenser during dehumidification operation. The first heat exchanger and the second heat exchanger are respectively fin-tube heat exchangers, and the number of fin rows of the second heat exchanger is less than the number of fin rows of the first heat exchanger. Therefore, the second heat exchanger can be used to properly heat the air dehumidified by the first heat exchanger to avoid the temperature of the air sent from the dehumidification device to the room becoming too low or too high. While improving the indoor comfort, the increase of the indoor refrigeration load is suppressed to achieve energy saving.

Furthermore, in the dehumidification device of the present invention, the dehumidification device preferably further comprises: a heater disposed downstream of the first heat exchanger; and a flow detector which cuts off power when the ventilation device is in a non-air supplying state to stop the heater from heating.

According to the dehumidification device of the utility model, the dehumidification device also has: a heater arranged downstream of the first heat exchanger; and a flow detector that cuts off power when the ventilation device is in a non-air supply state to stop the heater from heating, thereby ensuring safety.

Furthermore, in the dehumidification device of the present invention, it is preferred that the first heat exchanger is a fin-tube heat exchanger, and the cooling tube of the first heat exchanger is a tube with an outer diameter of 4 mm to 7 mm.

According to the dehumidification device of the utility model, the first heat exchanger is a fin-tube heat exchanger, and the cooling tube of the first heat exchanger is a tube with an outer diameter of 4 mm to 7 mm. Therefore, the heat exchanger for air conditioning can be flexibly applied.

Furthermore, in the dehumidification device of the present invention, it is preferred that the first heat exchanger is a fin-tube heat exchanger, the fins of the first heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm.

According to the dehumidification device of the utility model, the first heat exchanger is a fin-tube heat exchanger, the fins of the first heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm, so the heat exchanger for air conditioning can be flexibly applied.

Furthermore, in the dehumidification device of the present invention, it is preferred that the second heat exchanger is a fin-tube heat exchanger, and the cooling tube of the second heat exchanger is a tube having an outer diameter of 4 mm to 7 mm.

Furthermore, in the dehumidification device of the present invention, the second heat exchanger is a fin-tube heat exchanger, and the cooling tube of the second heat exchanger is a tube with an outer diameter of 4 mm to 7 mm, so the heat exchanger for air conditioning can be flexibly applied.

Furthermore, in the dehumidifier of the present invention, it is preferred that the outer diameter of the cooling tube of the second heat exchanger is larger than the outer diameter of the cooling tube of the first heat exchanger.

According to the dehumidification device of the present invention, the outer diameter of the cooling pipe of the second heat exchanger is larger than the outer diameter of the cooling pipe of the first heat exchanger, so the cooling pipe can be optimized.

Furthermore, in the dehumidification device of the present invention, it is preferred that the second heat exchanger is a fin-tube heat exchanger, the fins of the second heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm.

According to the dehumidification device of the utility model, the second heat exchanger is a fin-tube heat exchanger, the fins of the second heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm. Therefore, the heat exchanger for air conditioning can be flexibly applied.

Furthermore, in the dehumidifier of the present invention, it is preferable that a distance between adjacent fins of the second heat exchanger is larger than a distance between adjacent fins of the first heat exchanger.

According to the dehumidifier of the present invention, the intervals between adjacent fins of the second heat exchanger are larger than the intervals between adjacent fins of the first heat exchanger, which helps to suppress air supply pressure loss.

In addition, in order to achieve the above-mentioned purpose, the utility model provides an air treatment system, which includes: a dehumidification device of any of the above items; and a ventilation device, which is arranged upstream of the air flow path of the dehumidification device, and the air outlet is connected to the air inlet of the dehumidification device via an air duct.

Furthermore, in order to achieve the above-mentioned purpose, the utility model provides an air treatment system, which comprises: a dehumidification device as described in any one of the above items; and an air-conditioning outdoor unit connected to the dehumidification device via a refrigerant piping to form a refrigerant circuit.

(Effect of utility model)

According to the utility model, when the rated dehumidification capacity of the first heat exchanger is set to D, the rated air volume of the ventilation device is set to W, and the effective length of the first heat exchanger is set to L, the relationship of 0.1 m*W/D＜L＜0.37 m*W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter. Therefore, when the heat exchanger used for air conditioning is used as the first heat exchanger, it is helpful to quickly determine the effective length of the heat exchanger for dehumidification while suppressing the loss of air supply pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram schematically showing the overall structure of an air treatment system including a dehumidification device according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a dehumidification device according to an embodiment of the present invention.

FIG. 3 is another perspective view schematically showing the dehumidification device according to the embodiment of the present invention, in which the drain pan is omitted.

FIG. 4 is another perspective view schematically showing the dehumidification device according to the embodiment of the present invention, in which the shell is omitted.

FIG. 5 is a circuit diagram schematically showing a dehumidification device according to an embodiment of the present invention.

FIG6 is a partial cross-sectional view schematically showing a first heat exchanger in the dehumidification device according to the embodiment of the present invention.

FIG. 7 is a schematic diagram showing a refrigerant circuit composed of a dehumidifier and an air-conditioning outdoor unit according to an embodiment of the present invention.

FIG. 8 is a schematic diagram showing a modification of the refrigerant circuit shown in FIG. 7 .

(Symbol Description)

1 Air handling system

100 Dehumidification device

110 Housing

120 First heat exchanger

121 fins

130 Drain pan

141 Control valve

142 Control valve

150 Second heat exchanger

160 Seals

200 Ventilation device

210 Shell

220 Intake fan

230 Exhaust fan

240 Total heat exchanger

300 Air conditioner outdoor unit

310 Compressor

320 Four-way valve

330 Outdoor heat exchanger

340 Control valve

350 Tanks

360 Four-way Valve

D1 First refrigerant pipe port

D2 Second refrigerant piping port

D3 Third refrigerant pipe port

JF Air Inlet

CF air outlet

JQ Air Inlet

CQ outlet

HQ Air Return Port

PQ Exhaust

FG1 Air Duct

FG2 Duct

FG3 Air Duct

P Refrigerant piping

P1 First piping

P2 Second piping

P3 Third pipe

R Room

Detailed ways

Below, the air treatment system including the embodiment of the utility model is described in conjunction with Figures 1 to 7, wherein Figure 1 is a block diagram schematically showing an air treatment system including a dehumidification device according to an embodiment of the utility model, Figure 2 is a stereoscopic diagram schematically showing the dehumidification device according to an embodiment of the utility model, Figure 3 is another stereoscopic diagram schematically showing the dehumidification device according to an embodiment of the utility model, in which the illustration of the drain pan is omitted, Figure 4 is another stereoscopic diagram schematically showing the dehumidification device according to an embodiment of the utility model, in which the illustration of the shell is omitted, Figure 5 is a circuit diagram schematically showing the dehumidification device according to an embodiment of the utility model, Figure 6 is a partial cross-sectional view schematically showing the first heat exchanger in the dehumidification device according to an embodiment of the utility model, and Figure 7 is a schematic diagram showing a refrigerant circuit composed of the dehumidification device according to an embodiment of the utility model and an air-conditioning outdoor unit.

(Overall structure of air handling system)

As shown in Figure 1, the air treatment system 1 includes a dehumidification device 100, a ventilation device 200 and an air-conditioning outdoor unit 300, wherein the ventilation device 200 is arranged upstream of the air flow path of the dehumidification device 100, and is connected to the dehumidification device 100 via the air duct FG1, and is used to supply air to the dehumidification device 100 (that is, the dehumidification device 100 is arranged downstream of the ventilation device 200, and the air flow blown out by the later-described intake fan 220 of the ventilation device 200 flows toward the dehumidification device 100), and the air-conditioning outdoor unit 300 is connected to the dehumidification device 100 via the refrigerant piping P, thereby forming a refrigerant circuit.

Here, as shown in Fig. 1 , the dehumidifier 100 is connected to the room R via the air duct FG2 to deliver the treated air to the room R. In addition, the ventilator 200 is also connected to the room R via the air duct FG3 to exhaust the air in the room R.

(Structure of dehumidification device)

As shown in Figures 1, 2, 4 and 6, the dehumidification device 100 has a shell 110, which has an air inlet JF and an air outlet CF connected to the ventilation device 200 (specifically, the air outlet CQ described later) through the air duct FG1. A first heat exchanger 120 for heat exchange using a refrigerant and a drain pan 130 located below the first heat exchanger 120 (for receiving condensed water dripping from the first heat exchanger 120 and the second heat exchanger 150 described later) are arranged in the shell 110. The first heat exchanger 120 works as an evaporator during dehumidification operation.

Here, when the rated dehumidification capacity of the first heat exchanger 120 is set to D, the rated air volume of the ventilation device 200 is set to W, and the effective length of the first heat exchanger 120 is set to L (the length dimension after removing the pipe joints at both ends of the length direction of the first heat exchanger 120), the relationship of 0.1 m*W/D＜L＜ ^0.37 m*W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter (for example, when D is 4 liters/hour and W is 10 m3/minute, L can be set to 0.5 m; when D is 1.1 liters/hour and W is 2.5 ^m3 /minute, L can be set to 0.5 m).

In addition, as shown in Figure 1, the dehumidification device 100 also has a first refrigerant piping port D1 and a second refrigerant piping port D2 which are respectively connected to the first heat exchanger 120. The outer diameter of the first refrigerant piping port D1 is larger than the outer diameter of the second refrigerant piping port D2. A regulating valve 141 capable of adjusting the opening is provided between the first heat exchanger 120 and the second refrigerant piping port D2.

In addition, as shown in FIG. 1 , FIG. 3 and FIG. 5 , a second heat exchanger 150 for performing heat exchange using a refrigerant is provided in the housing 110 . The second heat exchanger 150 is located downstream of the first heat exchanger 120 and operates as a condenser during the dehumidification operation.

In addition, as shown in Figure 1, the dehumidification device 100 also has a third refrigerant piping port D3, and the third refrigerant piping port D3 and the second refrigerant piping port D2 are respectively connected to the second heat exchanger 150, and a regulating valve 142 capable of adjusting the opening is provided between the second heat exchanger 150 and the second refrigerant piping port D2.

In addition, as shown in FIGS. 2 to 4 , the housing 110 is in a rectangular parallelepiped shape as a whole. In addition, a seal 160 is provided in the housing 110. The seal 160 is in a box shape with an opening at the bottom as a whole and is attached to substantially all inner surfaces of the housing 110 except the bottom surface. In addition, the drain pan 130 blocks the opening at the bottom of the seal 160, and the first heat exchanger 120 and the second heat exchanger 150 are accommodated in a space surrounded by the seal 160 and the drain pan 130.

In addition, the first heat exchanger 120 is preferably a fin-tube heat exchanger (as shown in FIG. 6 , the fins 121 are arranged in the longitudinal direction of the heat exchanger), and the cooling tube of the first heat exchanger 120 is a tube with an outer diameter of 4 mm to 7 mm (e.g., 5 mm, 6 mm). In addition, the fins of the first heat exchanger 120 are preferably made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm.

In addition, it is preferred that the second heat exchanger 150 is also a fin-tube heat exchanger (the fins are also arranged in the length direction of the heat exchanger), and the cooling tube of the second heat exchanger 150 is a tube with an outer diameter of 4 mm to 7 mm (for example, 5 mm, 6 mm). Furthermore, it is preferred that the fins of the second heat exchanger 150 are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm. Furthermore, it is preferred that the number of rows of fins of the second heat exchanger 150 is less than the number of rows of fins of the first heat exchanger 120. Furthermore, it is preferred that the outer diameter of the cooling tube of the second heat exchanger 150 is larger than the outer diameter of the cooling tube of the first heat exchanger 120. Furthermore, it is preferred that the interval between adjacent fins of the second heat exchanger 150 is larger than the interval between adjacent fins of the first heat exchanger 120.

(Structure of ventilation device)

As shown in Figure 1, the ventilation device 200 has a shell 210, which has an air inlet JQ, an air outlet CQ, a return air port HQ and an exhaust port PQ, wherein the air inlet JQ inhales external air, the air outlet CQ is connected to the air inlet JF of the dehumidification device 100 via the air duct FG1, the return air port HQ is connected to the room R via the air duct FG3, and the exhaust port PQ discharges air to the outside.

Here, as shown in Figure 1, an intake fan 220 and an exhaust fan 230 are provided in the shell 210, wherein the intake fan 220 is used to suck in external air from the air inlet JQ and then discharge it from the air outlet CQ, and the exhaust fan 230 is used to suck in the air in the room R from the return air port HQ and then discharge it from the exhaust port PQ.

In addition, as shown in FIG. 1 , a total heat exchanger 240 is also provided in the housing 210 , and the total heat exchanger 240 can perform heat exchange between the air flowing from the air inlet JQ to the air outlet CQ and the air flowing from the air return port HQ to the air outlet PQ.

Furthermore, it is preferable that the ventilation device 200 can also perform an internal circulation in which the air sucked in from the air return port HQ is discharged to the air outlet CQ.

(Structure of air conditioner outdoor unit)

As shown in FIG. 7 , the air-conditioning outdoor unit 300 includes a compressor 310 , a four-way valve 320 , an outdoor heat exchanger 330 , a regulating valve 340 , and a storage tank 350 .

Here, as shown in Fig. 1 and Fig. 7, the air conditioner outdoor unit 300 is a three-pipe structure, and in addition to the pipes provided with the outdoor heat exchanger 330 and the regulating valve 340 and the pipes provided with the storage tank 350 as in the conventional two-pipe structure air conditioner outdoor unit, it also includes a branch pipe branched from the discharge pipe of the compressor 310 and provided with a four-way valve 360. And the air conditioner outdoor unit 300 is connected to the dehumidifier 100 through the first pipe P1, the second pipe P2 and the third pipe P3 as the refrigerant pipe P, wherein the first pipe P1 connected to the first refrigerant pipe port D1 of the dehumidifier 100 is a pipe for circulating gas refrigerant, the second pipe P2 connected to the second refrigerant pipe port D2 of the dehumidifier 100 is a pipe for circulating liquid refrigerant, and the third pipe P3 connected to the third refrigerant pipe port D3 of the dehumidifier 100 is a high-low pressure pipe (for example, when the second heat exchanger 150 functions as an evaporator, a low-pressure refrigerant is circulated). Furthermore, the outer diameter of the third refrigerant pipe port D3 is smaller than the outer diameter of the first refrigerant pipe port D1 , but larger than the outer diameter of the second refrigerant pipe port D2 .

In addition, as shown in FIG7 , during the dehumidification operation, the high-temperature and high-pressure refrigerant compressed by the compressor 310 of the air-conditioning outdoor unit 300 flows into the first heat exchanger 120 of the dehumidification device 100 through the first pipe P1 after being cooled by the outdoor heat exchanger 330, thereby dehumidifying the air flowing through the dehumidification device 100, and then returns to the air-conditioning outdoor unit 300 through the second pipe P2. On the other hand, during the dehumidification operation, the high-temperature and high-pressure refrigerant compressed by the compressor 310 of the air-conditioning outdoor unit 300 may also flow into the second heat exchanger 150 of the dehumidification device 100 through the third pipe P3, thereby heating the air flowing through the dehumidification device 100, and then returns to the air-conditioning outdoor unit 300 through the second pipe P2.

(Main Effects of the Present Embodiment)

According to the air treatment system 1 of the present embodiment, in the dehumidification device, when the rated dehumidification capacity of the first heat exchanger is set to D, the rated air volume of the ventilation device is set to W, and the effective length of the first heat exchanger is set to L, the relationship of 0.1m*W/D＜L＜0.37m*W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter. Therefore, when the heat exchanger used for air conditioning is used as the first heat exchanger, it is helpful to quickly determine the effective length of the heat exchanger for dehumidification while suppressing the air supply pressure loss. In addition, when L is less than 0.1m*W/D as the lower limit, the dehumidification capacity is insufficient; when L is greater than 0.37m*W/D as the upper limit, sufficient performance (dehumidification capacity) can be obtained, but it will cause the capacity to be too strong and difficult to control, the cost to increase, and the product size to be large.

The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned embodiments.

For example, in the above-described embodiment, an air-conditioning indoor unit connected to the air-conditioning outdoor unit 300 via the first pipe P1 and the second pipe P2 may be further included.

In addition, in the above embodiment, the third pipe P3 is a high-low pressure pipe, but it is not limited to this. As shown in FIG8 , the third pipe P3 may also be a pipe that is connected to the discharge pipe of the compressor 310 and only allows the high-pressure gas refrigerant to flow, so that the second heat exchanger 150 functions only as a condenser, thereby forming a simple refrigerant circuit. In this case, the outer diameter of the third refrigerant pipe port D3 connected to the third pipe P3 may be formed to be smaller than the outer diameter of the first refrigerant pipe port D1 and larger than the outer diameter of the second refrigerant pipe port D2, or may be formed to be the same as the outer diameter of the first refrigerant pipe port D1.

In addition, in the above-mentioned embodiment, the structure of the refrigerant circuit is not limited to the structure shown in Figures 7 and 8, and any refrigerant circuit can be used as long as one heat exchanger in the dehumidification device 100 is used as an evaporator and the other heat exchanger is used as a condenser.

In addition, in the above-mentioned embodiment, the first heat exchanger 120 and the second heat exchanger 150 are connected to an air-conditioning outdoor unit 300 via a refrigerant piping, but it is not limited to this. The first heat exchanger 120 can also be connected to an air-conditioning outdoor unit via a refrigerant piping, and the second heat exchanger 150 can be connected to another air-conditioning outdoor unit via a refrigerant piping.

In addition, in the above embodiment, the second heat exchanger 150 for heat exchange using refrigerant is provided in the housing 110, but the present invention is not limited thereto, and a heater (such as a PTC heater) located downstream of the first heat exchanger 120 may be provided to replace the second heat exchanger 150, or the second heat exchanger 150 may be directly omitted. In this case, a flow detector may be added to cut off the power when the ventilation device 200 is in a non-air supply state so that the heater stops heating.

Furthermore, in the above embodiment, when the second heat exchanger 150 is omitted, the third refrigerant pipe port D3, the regulating valve 142 and the third pipe P3 may be omitted at the same time, that is, a two-pipe structure of the air conditioner outdoor unit 300 may be adopted.

Furthermore, in the above-described embodiment, the ventilator 200 includes the total heat exchanger 240 , but the present invention is not limited thereto, and the total heat exchanger 240 may be omitted.

It should be understood that within the scope of the present invention, various parts in the embodiments can be freely combined, or various parts in the embodiments can be appropriately deformed or omitted.

Claims (12)

1. A dehumidifier, comprising a housing, the housing having an air inlet and an air outlet connected to a ventilation device through an air duct, a first heat exchanger for heat exchange using a refrigerant and a drain pan below the first heat exchanger, the first heat exchanger working as an evaporator during dehumidification operation, characterized in that: When the rated dehumidification capacity of the first heat exchanger is set to D, the rated air volume of the ventilation device is set to W, and the effective length of the first heat exchanger is set to L, the relationship of 0.1 m*W/D＜L＜0.37 m*W/D is satisfied, wherein the unit of D is liter/hour, the unit of W is ^m3 /minute, and the unit of L is meter. 2. The dehumidification device according to claim 1, characterized in that: The dehumidifier further comprises a first refrigerant piping port and a second refrigerant piping port respectively connected to the first heat exchanger, wherein the outer diameter of the first refrigerant piping port is larger than the outer diameter of the second refrigerant piping port. A regulating valve whose opening degree can be adjusted is provided between the first heat exchanger and the second refrigerant pipe port. 3. The dehumidification device according to claim 1, characterized in that: A second heat exchanger for performing heat exchange using a refrigerant is disposed in the housing, the second heat exchanger is located downstream of the first heat exchanger and operates as a condenser during dehumidification operation. The first heat exchanger and the second heat exchanger are fin-tube heat exchangers respectively, and the number of rows of fins of the second heat exchanger is less than the number of rows of fins of the first heat exchanger. 4. The dehumidification device according to claim 1, characterized in that: The dehumidification device also has: a heater disposed downstream of the first heat exchanger; and A flow detector is configured to cut off power when the ventilation device is in a non-air supply state so as to stop the heater from heating. 5. The dehumidification device according to claim 1, characterized in that: The first heat exchanger is a fin-tube heat exchanger, The cooling tube of the first heat exchanger is a tube with an outer diameter of 4 mm to 7 mm. 6. The dehumidification device according to claim 1, characterized in that: The first heat exchanger is a fin-tube heat exchanger, The fins of the first heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm. 7. The dehumidification device according to claim 3, characterized in that: The second heat exchanger is a fin-tube heat exchanger, The cooling tube of the second heat exchanger is a tube with an outer diameter of 4 mm to 7 mm. 8. The dehumidification device according to claim 7, characterized in that: The outer diameter of the cooling tube of the second heat exchanger is larger than the outer diameter of the cooling tube of the first heat exchanger. 9. The dehumidification device according to claim 3, characterized in that: The second heat exchanger is a fin-tube heat exchanger, The fins of the second heat exchanger are made of aluminum, and the interval between adjacent fins is 1.0 mm to 1.8 mm. 10. The dehumidification device according to claim 9, characterized in that: The interval between adjacent fins of the second heat exchanger is larger than the interval between adjacent fins of the first heat exchanger. 11. An air treatment system, comprising: The dehumidification device according to any one of claims 1 to 9; and A ventilation device is arranged upstream of the air flow path of the dehumidification device, and an air outlet of the ventilation device is connected to the air inlet of the dehumidification device via an air duct. 12. An air treatment system, comprising: The dehumidification device according to any one of claims 1 to 9; and An air-conditioning outdoor unit is connected to the dehumidifier via a refrigerant pipe to form a refrigerant circuit.