Dehumidification system capable of achieving large temperature difference

Abstract

The utility model discloses a dehumidification system capable of achieving a large temperature difference, and relates to the technical field of refrigeration, in particular to the dehumidification system capable of achieving the large temperature difference. Comprising a water pipe, a water return pipe, a bypass pipe, surface coolers and water valves, the surface air coolers at least comprise a first surface air cooler and a second surface air cooler; the water valves at least comprise a first water valve, a second water valve and a water return valve; fresh air passes through the first surface air cooler and the second surface air cooler in sequence to be dehumidified and cooled. The water conveying pipe is connected to a first connector of the first water valve, an inlet of the first surface air cooler is connected with a second connector of the first water valve, an outlet of the first surface air cooler is connected with an inlet of the second surface air cooler, and a third connector of the first water valve is connected with an inlet of the second surface air cooler through a pipeline. An outlet of the second surface air cooler is connected to the return pipe through a second water valve; one end of the bypass pipe is connected to the second surface air cooler inlet, and the other end is connected with the return pipe through the return valve. The dual purposes of saving energy and cost are achieved.

Description

Technical Field

[0001] This application belongs to the technical field of refrigeration, and particularly relates to a dehumidification system for achieving a large temperature difference. Background Art

[0002] For industries with low humidity process requirements such as lithium batteries, pharmaceuticals, and archives, single-rotor or even double-rotor dehumidification units are required in low humidity demand rooms. To achieve the purpose of dehumidification, it is necessary to supply low-temperature chilled water to the rotor dehumidification unit to achieve primary dehumidification of the coil. Different from conventional dehumidification units, the dehumidification function of double-rotor dehumidification units, single-rotor dehumidification units, or temperature and humidity independent control combined air handling units is mainly achieved through the surface cooler and the rotor, and the dehumidification capacity of the rotor is greater. Generally, the air supply after passing through the surface cooler and the rotor can no longer be dehumidified by the chilled water system.

[0003] In the implementation process, the applicant found that there are at least the following problems in the prior art:

[0004] One is to adopt two sets of independent chilled water systems, namely a low-temperature system and a medium-temperature system. Due to the need for two sets of independent cold heat sources and terminal systems, the initial investment of the system is relatively high, and the temperature difference is still relatively conventional, without reducing the transmission and distribution energy consumption.

[0005] The other is the combined use of multiple surface coolers. Although it can achieve large temperature difference operation and reduce the transmission and distribution energy consumption, due to the large load fluctuations borne by each surface cooler, it is very easy to cause load mismatch, thus failing to meet the basic functional requirements of dehumidification and cooling. Utility Model Content

[0006] To solve the above at least one defect, this application proposes a dehumidification system for achieving a large temperature difference, which is used to simplify the unit and system configuration, reduce the system transmission and distribution energy consumption, and improve the system dehumidification capacity on the basis of meeting the dehumidification and cooling functions of the unit.

[0007] An embodiment of this application provides a dehumidification system for achieving a large temperature difference, including a water supply pipe, a water return pipe, a bypass pipe, a surface cooler, and a water valve.

[0008] Preferably, the surface cooler includes at least a first surface cooler and a second surface cooler.

[0009] Preferably, the water valve includes at least a first water valve, a second water valve, and a water return valve.

[0010] The fresh air is dehumidified and cooled in turn through the first surface cooler and the second surface cooler.

[0011] The first water valve includes at least three interfaces; the second water valve and the water return valve include at least two interfaces.

[0012] The water delivery pipe is connected to the first interface of the first water valve; the inlet of the first surface cooler is connected to the second interface of the first water valve through a pipeline, and the outlet of the first surface cooler is connected to the inlet of the second surface cooler through a pipeline.

[0013] The inlet of the second surface cooler is connected to the third interface of the first water valve through a pipeline, and the outlet of the second surface cooler is connected to the return water pipe through the second water valve. Among them, the outlet of the second surface cooler is connected to the first adjustment interface of the second water valve, and the return water pipe is connected to the second adjustment interface of the second water valve.

[0014] One end of the bypass pipe is connected to the inlet of the second surface cooler, and the other end of the bypass pipe is connected to the return water pipe through a return water valve.

[0015] Preferably, at least a first temperature sensor and a second temperature sensor are further provided in the system. The first temperature sensor is arranged at the air outlet of the first surface cooler, and the second temperature sensor is arranged at the air outlet of the second surface cooler.

[0016] Preferably, the system is provided with a control device, and the control device is connected to the first temperature sensor and the second temperature sensor.

[0017] Preferably, the control device is further connected to each of the water valves.

[0018] Preferably, the system is further provided with a return air duct, and the return air duct is connected to the first surface cooler and / or the second surface cooler. The indoor return air is mixed with the fresh air entering the first surface cooler and / or the second surface cooler through the return air duct and then cooled and dehumidified.

[0019] In an alternative solution, the system further includes a first runner connected to the control device, and the first runner is arranged between the first surface cooler and the second surface cooler.

[0020] The first runner performs secondary dehumidification treatment on the fresh air that has been cooled and dehumidified by the first surface cooler.

[0021] Preferably, the fresh air passes through the first surface cooler, the first runner, and the second surface cooler in sequence.

[0022] In another alternative solution, the surface cooler further includes at least one intermediate surface cooler, and the water valve further includes at least one intermediate water valve. At least one of the intermediate surface coolers is arranged between the first surface cooler and the second surface cooler. The inlets of the intermediate surface coolers are all connected to the outlet of the first surface cooler, and the intermediate surface coolers and the intermediate water valves are respectively connected to the control device.

[0023] The inlets of the intermediate surface coolers are all connected to the third interface of the first water valve through pipelines, and the outlets of the intermediate surface coolers are all connected to the return water pipe through the intermediate water valves.

[0024] Preferably, the system further includes a second runner and a third runner. The second runner is arranged between the first surface cooler and the intermediate surface cooler near the first surface cooler, and the third runner is arranged between the intermediate surface cooler near the second surface cooler and the second surface cooler. Both the second runner and the third runner are connected to the control device.

[0025] The fresh air sequentially passes through the first surface cooler, the second runner, at least one intermediate surface cooler, the third runner, and the second surface cooler.

[0026] Preferably, the system further includes at least one intermediate temperature sensor connected to the control device, and the at least one intermediate temperature sensor is arranged at the air outlet of the corresponding at least one intermediate surface cooler.

[0027] Meanwhile, the control device adjusts the opening degree of the second water valve according to the indoor return air temperature and the air outlet temperature of the second surface cooler.

[0028] It can be understood that when there are at least two intermediate surface coolers, at least one intermediate runner is included between the intermediate surface coolers, and all the intermediate runners are connected to the control device.

[0029] The fresh air sequentially passes through the first surface cooler, the first runner, at least one intermediate surface cooler and / or at least one intermediate runner, the second runner, and the second surface cooler.

[0030] Preferably, the return air duct is connected to the at least one intermediate surface cooler, and the indoor return air is mixed with the fresh air entering the intermediate surface cooler through the return air duct for cooling and dehumidification.

[0031] Based on any of the above aspects, a dehumidification system for achieving a large temperature difference provided by an embodiment of the present application, through the optimization and adjustment of pipelines and valves, flexibly collocating refrigeration technologies and different dehumidification units, overcomes the technical problems of high cost, high transmission and distribution energy consumption, small temperature difference, and large load fluctuations borne by each surface cooler in the prior art. Furthermore, on the basis of meeting the dehumidification and cooling functions, the system configuration is simplified, the transmission and distribution energy consumption of the refrigeration system is reduced, the dehumidification capacity of the runner is improved, the application of large temperature difference water storage cooling can be realized, and the dual goals of energy saving and cost saving are achieved. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0033] Figure 1An architecture of a dehumidification system for achieving a large temperature difference provided by this application Figure 1 。

[0034] Figure 2 An architecture of a dehumidification system for achieving a large temperature difference provided by this application Figure 2 。

[0035] Figure 3 An architecture of a dehumidification system for achieving a large temperature difference provided by this application Figure 3 。

[0036] Figure 4 The first water valve structure diagram used in the embodiments of this application

[0037] Figure 5 The second water valve structure diagram used in the embodiments of this application

[0038] In the figure: 1, water supply pipe; 2, return water pipe; 3, bypass pipe; 4, first surface cooler; 5, second surface cooler; 6, first water valve; 7, second water valve; 8, return water valve; 9, first temperature sensor; 10, second temperature sensor; 11, control device; 12, fresh air; 13, return air duct; 14, first runner; 15, second runner; 16, third runner; 17, intermediate surface cooler; 18, intermediate temperature sensor; 19, intermediate water valve; 601, first interface; 602, second interface; 603, third interface; 701, first adjustment interface; 702, second adjustment interface Detailed implementation manners

[0039] This application provides a dehumidification system for achieving a large temperature difference. To make the purpose, technical solution and effect of this application clearer and more definite, the following further elaborates on this application with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain this application and are not used to limit this application

[0040] Those skilled in the art of this technology can understand that unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "including" used in the specification of this application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items

[0041] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical terms and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be construed in an idealized or overly formal sense unless specifically defined as here.

[0042] The following further illustrates the content of the application by describing the embodiments in conjunction with the accompanying drawings.

[0043] The accompanying drawings of this application are only for illustrative purposes and should not be construed as a limitation of this application. To better illustrate the following embodiments, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0044] Embodiment 1

[0045] Figure 1 Shown is an implementation scheme of a dehumidification system for achieving a large temperature difference proposed by this application, including: a water supply pipe 1, a return water pipe 2, a bypass pipe 3, a surface cooler, a water valve, a temperature sensor, a control device 11, and a return air duct 13.

[0046] In this embodiment, the surface cooler at least includes a first surface cooler 4 and a second surface cooler 5, and cools and dehumidifies the outdoor fresh air 12 entering the system.

[0047] Preferably, the outdoor fresh air 12 first undergoes the first step of cooling and dehumidification through the first surface cooler 4, then undergoes secondary cooling through the second surface cooler 5, and then is sent into the room.

[0048] In the specific implementation process, the surface cooler can also be provided with three or more surface coolers according to actual needs, and the outdoor fresh air 12 sequentially passes through each surface cooler to complete cooling and dehumidification and then is sent into the room.

[0049] The water valve at least includes a first water valve 6, a second water valve 7, and a return water valve 8.

[0050] In the specific implementation process, the number of the water valves is adaptively set according to the number of the surface coolers to cooperate with each surface cooler to work.

[0051] By adjusting the opening degrees of the respective water valves, the flow rate and flow direction of the cooling water in the pipeline are changed.

[0052] Specifically, the first water valve 6 includes at least three interfaces; the second water valve 7 and the return water valve 8 each include at least two interfaces.

[0053] Specifically, the states of each water valve before the system works: the first interface 601 and the second interface 602 of the first water valve 6 are open, and the third interface 603 is closed; the second water valve 7 is fully open; the return water valve 8 is fully closed.

[0054] By adjusting the opening degrees of each water valve, the state of the cooling water in the pipeline can be changed, and the cooling effects of each surface cooler can be changed.

[0055] Specifically, the connection relationships between each pipeline and the water valves are as follows:

[0056] The water supply pipe 1 is connected to the first interface 601 of the first water valve 6; the inlet of the first surface cooler is connected to the second interface 602 of the first water valve 6, the outlet of the first surface cooler 4 is connected to the inlet of the second surface cooler 5, and the cooling water enters the second surface cooler 5 after passing through the first surface cooler 4.

[0057] The inlet of the second surface cooler 5 is connected to the third interface 603 of the first water valve 6. When the third interface 603 of the first water valve 6 is open, the cooling water passing through the first surface cooler 4 and the cooling water from the water supply pipe 1 are mixed and then enter the second surface cooler 5; the outlet of the second surface cooler 5 is connected to the return water pipe 2 through the second water valve 7. Among them, the outlet of the second surface cooler 5 is connected to the first adjustment interface 701 of the second water valve 7, and the return water pipe 2 is connected to the second adjustment interface 702 of the second water valve 7.

[0058] One end of the bypass pipe 3 is connected to the inlet of the second surface cooler, and the other end of the bypass pipe 3 is connected to the return water pipe 2 through the return water valve 8. When the return water valve 8 is open, the cooling water passes through the bypass pipe 3 and flows back from the return water pipe 2 to the second surface cooler 5.

[0059] In this embodiment, the system is provided with a control device 11, and the control device 11 is connected to each water valve.

[0060] The control device 11 receives the temperature data from the temperature sensor and controls the opening degrees of each water valve based on the outlet air temperatures of each surface cooler.

[0061] Preferably, temperature sensors are arranged at the air outlets of each surface cooler, and the temperature sensors include a first temperature sensor 9 and a second temperature sensor 10.

[0062] The first temperature sensor 9 is used to obtain the outlet air temperature of the first surface cooler 4, and the second temperature sensor 10 is used to obtain the outlet air temperature of the second surface cooler 5.

[0063] Preferably, each temperature sensor is connected to the control device 11, and after obtaining the outlet air temperatures of each surface cooler, it transmits them to the control device 11 to improve the control accuracy of the control device 11 for the valves.

[0064] Optionally, each of the temperature sensors and the control device 11, and the control device 11 and each of the water valves may be wirelessly connected.

[0065] Preferably, the return air duct 13 is connected to the first surface cooler 4 and / or the second surface cooler 5. The indoor return air enters the first surface cooler 4 and / or the second surface cooler 5 through the return air duct 13, is cooled and dehumidified again, and then enters the room again.

[0066] Preferably, the indoor return air returns to the surface cooler, and the heat and moisture in the room are taken away by the surface cooler. After being mixed with the outdoor fresh air entering the first surface cooler 4 and / or the second surface cooler 5, it circulates, effectively reducing energy consumption.

[0067] During specific operation, after the outdoor fresh air 12 enters the dehumidification system of this embodiment, it is cooled and dehumidified by the first surface cooler 4, and the temperature is T1. After being cooled by the second surface cooler 5, the temperature is T2, and then it is sent into the room, where T1 is less than T2.

[0068] When indoor return air enters the first surface cooler 4, after the outdoor fresh air is mixed with the return air, it is cooled and dehumidified by the first surface cooler 4, and the temperature is T1. After being cooled by the second surface cooler 5, the temperature is T2, and then it is sent into the room;

[0069] When indoor return air enters the second surface cooler 5, after the outdoor fresh air is cooled and dehumidified by the first surface cooler 4, the temperature is T1, and then it is mixed with the indoor return air and cooled by the second surface cooler 5, and the temperature is T2, and then it is sent into the room;

[0070] When indoor return air enters the first surface cooler 4 and the second surface cooler 5, after the outdoor fresh air is mixed with the return air, it is cooled and dehumidified by the first surface cooler 4, and the temperature is T1. Then it is mixed with the indoor return air again, and finally cooled by the second surface cooler 5, and the temperature is T2, and then it is sent into the room.

[0071] When the system starts up, the first interface 601 and the second interface 602 of the first water valve 6 can be set to be open, the third interface 603 to be closed, the second water valve 7 to be fully open, and the return water valve 8 to be closed.

[0072] During the operation of the system, the outlet air temperature T1 of the first surface cooler 4 is obtained through the first temperature sensor 9, and the opening degree of the third interface 603 of the first water valve 6 is adjusted according to the outlet air temperature T1 of the first surface cooler 4;

[0073] During the operation of the system, the outlet air temperature T2 of the second finned tube cooler 5 is obtained through the second temperature sensor 10, and the opening degree of the second water valve 7 is adjusted according to the outlet air temperature T2 of the second finned tube cooler 5. If indoor return air enters the first finned tube cooler 4 and / or the second finned tube cooler 5, the opening degree of the second water valve 7 can also be adjusted by collecting the indoor return air temperature Tn.

[0074] During the operation of the system, the opening and closing state and the opening degree of the return water valve 8 can be determined according to the opening degree of the third interface 603 of the first water valve 6 in combination with the outlet air temperature T1 of the first finned tube cooler 4. Specifically, it includes:

[0075] When the opening degree of the third interface 603 of the first water valve 6 is adjusted to the maximum, the third interface 603 of the first water valve 6 cannot be adjusted anymore, then the return valve 8 slowly opens and is adjusted according to the outlet air temperature T1 of the first finned tube cooler 4; when the overall cooling water demand of the system decreases and the opening degree of the return water valve 8 decreases to the fully closed state, then the opening degree of the third interface 603 of the first water valve 6 is gradually reduced and adjusted according to the outlet air temperature T1 of the first finned tube cooler 4.

[0076] During the operation of the system, the cooling water temperature t1 in the water supply pipe 1 becomes the intermediate temperature t2 after heat exchange through the first finned tube cooler 4 and supplies cold to the second finned tube cooler 5. Finally, the return water of each branch of the second finned tube cooler 5 and the bypass pipe 3 is mixed to form the return water temperature t3.

[0077] Based on the above working process and working principle, the temperature difference between the outlet water and the return water in the water supply pipe 1 is 7 - 12°C, that is, there is a 5°C temperature difference. The large temperature difference dehumidification system of this embodiment realizes a super large temperature difference of 14°C by setting the bypass pipe 3 and adjusting the opening and closing state and the opening degree of each water valve according to the collected temperature. On the basis of meeting the dehumidification and cooling functions, the system configuration is simplified, the energy consumption of the refrigerant system transmission and distribution is reduced, which is beneficial to the application of the large temperature difference refrigerant energy storage technology. It can greatly increase the energy storage capacity of the unit volume energy storage tank or energy storage pool, increase the economy of the refrigerant energy storage system, and achieve the dual goals of energy conservation and cost savings.

[0078] Embodiment 2

[0079] Figure 2 Shown is another implementation scheme of a dehumidification system for realizing a large temperature difference proposed in this application, including: a water supply pipe 1, a return water pipe 2, a bypass pipe 3, a finned tube cooler, a water valve, a first runner 14, a temperature sensor, a control device 11, and a return air duct 13.

[0080] Preferably, on the basis of Embodiment 1, a first runner 14 is arranged between the first finned tube cooler 4 and the second finned tube cooler 5 in this embodiment. The first runner 14 is connected to the control device 11. Compared with the finned tube cooler, the runner has a better dehumidification effect.

[0081] Specifically, after the outdoor fresh air 12 enters the system, it is first cooled and dehumidified to T1 by the first surface cooler 4, then secondarily dehumidified by the first rotary wheel 14, and finally secondarily cooled to T2 by the second surface cooler 5 and then sent into the room.

[0082] Preferably, the return air duct 13 is connected to the second surface cooler 5. The indoor return air returns to the second surface cooler 5 through the return air duct 13, mixes with the fresh air that has been dehumidified by the first rotary wheel 14, and after being cooled by the second surface cooler 5, is sent into the room.

[0083] Embodiment 3

[0084] Figure 3 Shown is another implementation of a dehumidification system for achieving a large temperature difference proposed in the present application, including: a water supply pipe 1, a return water pipe 2, a bypass pipe 3, a surface cooler, a water valve, a rotary wheel, a temperature sensor, a control device 11, and a return air duct 13.

[0085] Preferably, on the basis of Embodiment 1, this embodiment includes at least one intermediate surface cooler 17, at least one intermediate water valve 19, at least one intermediate temperature sensor 18, and at least two rotary wheels.

[0086] Specifically, an intermediate surface cooler 17 is provided between the first surface cooler 4 and the second surface cooler 5.

[0087] The intermediate surface cooler 17 performs gradient cooling on the fresh air 12 and the mixed air of the fresh air 12 and the indoor return air, increasing the cooling effect.

[0088] The inlet of the intermediate surface cooler 17 is connected to the outlet of the first surface cooler 4 and is also connected to the third interface 603 of the first water valve 6. The outlet of the intermediate surface cooler 17 is connected to the return water pipe 2 through the intermediate water valve 19.

[0089] The rotary wheel at least includes a second rotary wheel 15 and a third rotary wheel 16;

[0090] Specifically, a second rotary wheel 15 is provided between the first surface cooler 4 and the intermediate surface cooler 17 close to the first surface cooler 4, and a third rotary wheel 16 is provided between the intermediate surface cooler 17 close to the second surface cooler 5 and the second surface cooler 5 to perform multiple dehumidification treatments on the fresh air 12.

[0091] Preferably, one intermediate temperature sensor 18 is provided at the air outlet of each intermediate surface cooler 17, and the intermediate temperature sensor 18 is used to obtain the air outlet temperature of the corresponding intermediate surface cooler 17.

[0092] Preferably, each of the intermediate temperature sensors 18 is connected to the control device 11, and can obtain the outlet air temperature after the s-surface cooler cools and dehumidifies, and transmit it to the control device 11, so as to improve the control accuracy of the control device 11 for the valve.

[0093] Specifically, after the outdoor fresh air 12 enters the system, it is first cooled and dehumidified to T1 by the first surface cooler 4, then dehumidified for the second time by the second rotary wheel 15, then cooled to T2 for the second time by the intermediate surface cooler 17, then dehumidified for the third time by the third rotary wheel 16, and finally cooled to T3 for the third time by the second surface cooler 5 and then sent into the room.

[0094] Obviously, the above-mentioned embodiments of the present application are only examples for clearly explaining the technical solutions of the present application, rather than limitations on the specific implementation manners of the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A dehumidification system for achieving a large temperature difference, comprising a water delivery pipe, a water return pipe, and a surface cooler, characterized in that: It also includes a control device, a bypass pipe, and a water valve; the surface cooler includes at least a first surface cooler and a second surface cooler, and the water valve includes at least a first water valve, a second water valve, and a return water valve; the fresh air passes through the first surface cooler and the second surface cooler in turn for dehumidification and cooling; the first water valve includes at least three interfaces; the second water valve and the return water valve include at least two interfaces; The water delivery pipe is connected to the first interface of the first water valve, the first cooler inlet is connected to the second interface of the first water valve through a pipeline, and the third interface of the first water valve is connected to the second cooler inlet through a pipeline; The first cooler outlet is connected to the second cooler inlet, and the second cooler outlet is connected to the return pipe through the second water valve; One end of the bypass pipe is connected to the inlet of the second surface cooler, and the other end of the bypass pipe is connected to the return pipe through a return valve; The control device is connected to the first surface cooler, the second surface cooler, the first water valve, the second water valve and the return water valve respectively.

2. A dehumidification system for achieving a large temperature difference according to claim 1, characterized in that: It also includes a first temperature sensor; the first temperature sensor is used to obtain the outlet air temperature of the first surface cooler and is connected to the control device.

3. A dehumidification system for achieving a large temperature difference according to claim 2, characterized in that: It also includes a second temperature sensor; the second temperature sensor is used to obtain the outlet air temperature of the second surface cooler and is connected to the control device.

4. A dehumidification system for achieving a large temperature difference according to claim 3, characterized in that: It also includes a return air duct, which is connected to the first surface cooler and / or the second surface cooler.

5. A dehumidification system for achieving a large temperature difference according to claim 4, characterized in that: It also includes a first rotor connected to the control device, and the first rotor is arranged between the first condenser and the second condenser.

6. A dehumidification system for achieving a large temperature difference according to any one of claims 1 to 4, characterized in that: The surface cooler also includes at least one intermediate surface cooler, and the water valve also includes at least one intermediate water valve, and the intermediate surface cooler and the intermediate water valve are respectively connected to the control device; At least one of the intermediate coolers is arranged between the first cooler and the second cooler, the inlet of the intermediate cooler is connected to the outlet of the first cooler, and is also connected to the third interface of the first water valve, and the outlet of the intermediate cooler is connected to the return pipe through the intermediate water valve.

7. A dehumidification system for achieving a large temperature difference according to claim 6, characterized in that: A second rotor connected to the control device is arranged between the first surface cooler and an intermediate surface cooler close to the first surface cooler, and a third rotor connected to the control device is arranged between the intermediate surface cooler close to the second surface cooler and the second surface cooler. Fresh air passes through the first surface cooler, the second rotor, at least one intermediate surface cooler, the third rotor, and the second surface cooler in sequence.

8. A dehumidification system for achieving a large temperature difference according to claim 6, characterized in that: The system further comprises an intermediate temperature sensor connected to the control device, wherein the intermediate temperature sensor is used to obtain the outlet air temperature of each intermediate surface cooler and is connected to the control device.

9. A dehumidification system for achieving a large temperature difference according to claim 6, characterized in that: The system further comprises a rotating wheel arranged between each intermediate cooler, and the rotating wheel is connected to the control device.

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