Heat exchange device and control method

Abstract

The invention provides a heat exchange device and a control method, the heat exchange device comprises a shell, an air pipe, a water pan, a heat exchanger and a circulating fan, a circulating cavity, an indoor air inlet and an indoor air outlet are formed in the shell, the indoor air inlet and the indoor air outlet are communicated with the circulating cavity, and the shell is further provided with a fresh air inlet, a lower air cavity and a fresh air outlet communicated with the lower air cavity; one end of the air pipe is communicated with the fresh air inlet, and the other end of the air pipe is obliquely downwards communicated with the lower air cavity to form a fresh air flow channel; the water pan is arranged at the bottom of the lower air cavity and can receive condensate water formed in the air pipe. The heat exchanger and the circulating fan are arranged in the circulating cavity and can provide cold air flowing through the outer wall of the air pipe. Fresh air is introduced through the air pipe, outdoor fresh air and indoor cold air intersect, condensate water is generated through cold and hot intersection to provide clean water for the wet film humidifier, and indoor air can be improved through the fresh air; heat exchange is carried out on outdoor fresh air and indoor cold air through the air pipe, the fresh air temperature is lowered, and warehouse temperature fluctuation is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a heat exchange device and a control method. Background Art

[0002] Atmospheric air is a mixture of dry air and a certain amount of water vapor, so it is also called wet air. When the surface temperature of the air conditioner evaporator coil is lower than the dew point temperature of the intake air flow, water vapor condenses on the coil surface, thereby producing condensed water. Theoretically, condensed water is pure water, but because the air contains impurities such as suspended dust, smoke, microorganisms and chemical emissions, these impurities are also mixed in the condensed water.

[0003] The existing fresh-keeping humidification equipment generally uses the water from the evaporator water tray to supply the wet film humidifier for humidification. However, since the water in the evaporator water tray is often dusty and mixed with impurities such as dust, the water is not clean and the humidification effect is poor. The introduction of fresh air into the fresh-keeping warehouse will cause large fluctuations in the warehouse temperature. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the water used for air conditioning humidification is not clean and affects the humidification effect, the present invention provides an air conditioning system.

[0005] The technical solution adopted by the present invention is:

[0006] The present invention provides a heat exchange device, comprising:

[0007] The shell has a circulation cavity, an indoor air inlet and an indoor air outlet connected to the circulation cavity, and the shell is also provided with a fresh air inlet, a lower air cavity, and a fresh air outlet connected to the lower air cavity;

[0008] An air duct is arranged in the circulation cavity, and one end of the air duct is connected to the fresh air inlet, and the other end is inclined downward to connect to the lower air cavity to form a fresh air flow channel;

[0009] A water receiving tray is arranged at the bottom of the lower air chamber and can receive condensed water formed in the air duct;

[0010] A heat exchanger and a circulation fan are arranged in the circulation chamber and can provide cold air flowing through the outer wall of the air duct;

[0011] A humidifier and a fresh air blower are arranged on the fresh air flow channel, and the humidifier is connected to the water receiving tray through a water supply pipe.

[0012] Furthermore, an air guide plate is provided at the upper portion of the lower air chamber, which separates the lower air chamber from the circulation chamber when closed, and connects the circulation chamber with the lower air chamber when opened.

[0013] Furthermore, an upper wind cavity is provided on the inner side of the fresh air inlet, the position of the upper wind cavity is higher than the position of the lower wind cavity, and the air duct is obliquely connected between the upper wind cavity and the lower wind cavity.

[0014] Furthermore, the fresh air inlet is arranged on one side of the shell, the indoor air inlet is arranged above the other side, and the fresh air outlet is arranged below, the heat exchanger is arranged on the inner side of the indoor air inlet, and the lower wind chamber, humidifier and fresh air fan are arranged side by side on the inner side of the fresh air outlet.

[0015] Furthermore, the circulation fan is obliquely arranged at a corner of the circulation chamber, and the air entering laterally from the indoor air inlet is blown obliquely downward from the corner.

[0016] Furthermore, the air duct includes: a plurality of spaced-apart parallel connecting pipes, the connecting pipes are arranged in a plurality of horizontal rows, and two vertically adjacent horizontal rows are staggered.

[0017] Furthermore, a water pump connected to the water supply pipe is provided in the water receiving tray, and a solenoid valve is provided on the water supply pipe.

[0018] Furthermore, an overflow port is provided on the side of the water receiving tray.

[0019] The present invention also provides a control method for a heat exchange device, using the above-mentioned heat exchange device, comprising the steps of:

[0020] Detecting the carbon dioxide concentration X1 and humidity W1 of the fresh-keeping store corresponding to the heat exchange device;

[0021] When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the air guide plate is closed, and the water pump of the humidifier and the fresh air blower are turned on.

[0022] When the carbon dioxide concentration X1 is less than or equal to the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the air guide plate is opened, and the water pump of the humidifier and the fresh air blower are turned on.

[0023] When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is greater than or equal to the preset humidity W, the air guide plate is closed and the fresh air blower is turned on.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. Introduce fresh air through the air duct, use the intersection of outdoor fresh air and indoor cold air, and the intersection of cold and hot produces condensed water to provide clean water to the wet film humidifier; replace the unclean condensed water in the evaporator water tray and provide it to the wet film humidifier to achieve better humidification effect.

[0026] 2. By using air ducts to exchange heat between outdoor fresh air and indoor cold air, the fresh air temperature can be lowered and warehouse temperature fluctuations can be reduced.

[0027] 3. The air guide plate is used to realize the cold air circulation in different air ducts, so that the fresh-keeping refrigeration device can operate in the fresh air humidification mode, and can also operate in the humidification mode alone to meet more working conditions and improve adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a structural diagram of a specific embodiment of the present invention;

[0030] Figure 2 A structural diagram of an air duct in an embodiment of the present invention;

[0031] Figure 3 It is an air flow diagram of the fresh air dehumidification mode in a specific embodiment of the present invention;

[0032] Figure 4 It is an air flow diagram of the fresh air dehumidification mode in a specific embodiment of the present invention;

[0033] Figure 5 It is an air flow diagram of the fresh air dehumidification mode in a specific embodiment of the present invention;

[0034] Figure 6 A flowchart in a specific embodiment of the present invention;

[0035] 010. Circulation fan;

[0036] 020. Heat exchanger;

[0037] 040, solenoid valve;

[0038] 060, fresh air fan;

[0039] 070. Humidifier;

[0040] 080. Overflow;

[0041] 090, water tray;

[0042] 100. Water pump;

[0043] 030, indoor air inlet; 050, fresh air outlet; 110, lower air chamber; 120, indoor air outlet; 130, air duct; 140, fresh air inlet; 150, upper air chamber; 190, heat exchange chamber; 200, evaporation chamber;

[0044] 160. filter screen; 170. air valve; 180. air guide plate. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0047] The existing fresh-keeping humidification equipment generally uses the water from the evaporator water tray to supply the wet film humidifier for humidification. However, since the water in the evaporator water tray is often dusty and mixed with impurities such as dust, the water is not clean and the humidification effect is poor. The introduction of fresh air into the fresh-keeping warehouse will cause large fluctuations in the warehouse temperature.

[0048] In this regard, Figure 1As shown, the present invention proposes a heat exchange device, which can be specifically a fresh-keeping refrigeration device, used for refrigeration and preservation of a fresh-keeping warehouse, the heat exchange device includes: a shell, an air duct 130, a heat exchanger 020, a circulating fan 010, a water receiving tray 090, a humidifier 070 and a fresh air fan 060, a circulation cavity is arranged inside the shell, an indoor air outlet 120 is arranged on the bottom plate of the lower side of the shell, an indoor air inlet 030 is arranged on the upper right side, the indoor air outlet 120 and the indoor air inlet 030 are connected to the circulation cavity to form a return air duct; a fresh air inlet 140 is arranged on the left side of the shell, a lower air cavity 110 is arranged in the shell, and a fresh air outlet 050 connected to the lower air cavity 110 and located at the lower right side of the shell, the air duct 130 is arranged on the return air flow channel, that is, its pipe body passes through the circulation cavity, and the left end of the air duct 130 is connected to the fresh air The inlet 140 is tilted downward at the right end and connected to the lower air cavity 110, so that a fresh air flow path is formed between the fresh air inlet 140 and the fresh air outlet 050; the water receiving tray 090 is arranged at the bottom of the lower air cavity 110, and can receive the condensed water formed in the air duct 130 and flowing downstream; the heat exchanger 020 and the circulating fan 010 are arranged in the circulation cavity to provide cooling for the air passing through the circulation cavity; the humidifier 070 is arranged above the water receiving tray 090, and is connected to the water receiving tray 090 through a water supply pipe, and the water in the water receiving tray 090 is used for humidification. The fresh air fan 060 is arranged on the fresh air flow path, and can be specifically located on the inner side of the fresh air outlet 050, that is, between the humidifier 070 and the fresh air outlet 050, and the water mist provided by the humidifier 070 can be sent out from the fresh air outlet 050 to humidify the fresh-keeping storage.

[0049] The present invention arranges an inclined air duct 130 on the return air flow channel, so that the indoor air cooled by the heat exchanger and the air entering from the outside through the air duct 130 intersect, so that the temperature of the external air in the air duct 130 is reduced, and condensed water is generated in the air duct 130. The fresh air flows along the air duct 130 to the lower air chamber 110, and the condensed water flows along the air duct 130 to the water receiving tray 090 for use by the humidifier 070. That is, the clean condensed water generated by the outdoor fresh air is obtained, and the temperature of the outdoor fresh air is reduced, so as to avoid excessive temperature fluctuations in the storage.

[0050] In a specific implementation, the downwind chamber 110 is surrounded by a plurality of sealing plates, wherein the sealing plate located at the upper inclined portion is a rotatable wind guide plate 180. Specifically, a rotating shaft can be arranged between the sealing plates connected to another sealing plate, the rotating shaft is fixedly connected to the wind guide plate 180, and the rotating shaft is rotatably installed on the edge of the other sealing plate, and the wind guide plate 180 can be driven to open and close by driving the rotating shaft; when the wind guide plate 180 is closed, the downwind chamber 110 is separated from the circulation chamber; when the wind guide plate 180 is opened, the downwind chamber 110 is connected to the circulation chamber, and at this time, a part of the cold air in the circulation chamber passes through the heat exchanger and enters the downwind chamber 110 from the gap at the opening of the wind guide plate 180, and is then blown into the warehouse through the humidifier 070 and the fresh air fan 060 for humidification, and the other part of the cold air is blown out from the indoor air outlet 120.

[0051] That is, by providing the wind guide plate 180 at the lower air chamber 110, the heat exchange device can have not only the fresh air humidification function, but also the circulating air humidification function, thereby improving the diversification of the mode functions to adapt to more different operating conditions.

[0052] In a specific implementation, an upper air cavity 150 is provided on the inner side of the fresh air inlet 140, and the fresh air inlet 140 is located in the middle position of the left side of the shell. The position of the upper air cavity 150 is higher than that of the lower air cavity 110, and the two ends of the air duct 130 are respectively connected to the upper air cavity 150 and the lower air cavity 110, that is, the air duct 130 is obliquely connected between the upper air cavity 150 and the lower air cavity 110.

[0053] By providing the air cavity, the layout of the air duct 130 can be diversified, thereby increasing the intersection area with the indoor cold air, that is, improving the heat exchange efficiency between the fresh air and the indoor cold air.

[0054] In a specific embodiment, the layout structure of the housing is as follows: a fresh air inlet 140 is arranged in the middle of the left side of the housing, an indoor air inlet 030 is arranged on the upper right side, and a fresh air outlet 050 is arranged on the lower side; the heat exchanger is arranged inside the indoor air inlet 030 and fixed by bolts. The fresh air fan 060 is arranged below the heat exchanger and is fixedly connected to the housing through a connecting plate to avoid air leakage, and is located inside the fresh air outlet 050. The humidifier 070 and the lower air chamber 110 are arranged on the left side of the fresh air fan 060 from right to left. The part of the housing other than the upper and lower air chambers 110 and the areas of the humidifier 070 and the fresh air fan 060 is a circulation chamber.

[0055] This local form is simple and compact, which does not affect the return air flow and can use the return air to cool the fresh air.

[0056] The circulation chamber is divided into an evaporation chamber 200 and a heat exchange chamber 190 by an inclined circulation fan 010. A heat exchanger, i.e., the evaporation chamber 200, is arranged in the evaporation chamber 200. The heat exchange chamber 190 is located in the air outlet direction of the circulation fan 010. An air duct 130 is arranged in the heat exchange chamber 190. The cold air passing through the heat exchange chamber 190 can exchange heat with the fresh air in the air duct 130 to cool the fresh air. At the same time, condensed water is generated in the air duct 130 to provide clean water for humidification.

[0057] The left bracket of the circulation fan 010 is connected to the top position of the left side of the shell, and the right side is connected to the bottom bracket of the heat exchanger through the right bracket, so that the circulation fan 010 is in a tilted state, which facilitates the indoor circulating cold air to flow to the air duct 130 and the indoor air outlet 120.

[0058] like Figure 2 As shown, in a specific embodiment, the air duct 130 includes: a plurality of spaced parallel connecting pipes, the connecting pipes are arranged in a plurality of horizontal rows, and two vertically adjacent horizontal rows are staggered.

[0059] By arranging multiple connecting pipes, the fresh air is subdivided into multiple bundles, and arranged in multiple rows at the same time, the contact area with the cold air is increased, the heat exchange efficiency between the fresh air and the return air is improved, the fresh air temperature is avoided to be too high, and at the same time enough condensed water can be generated for collection.

[0060] Specifically, a water pump 100 is provided in the water receiving tray 090, and the water pump 100 is connected to the humidifier 070 through a water supply pipe. At the same time, a solenoid valve 040 is also provided on the water supply pipe, which can open and close the water supply pipe, so that the water supply of the humidifier 070 can be controlled by the controller, which is convenient for mode adjustment.

[0061] In a specific implementation, an overflow port 080 is provided on the side of the water receiving tray 090 to prevent excessive condensed water from overflowing from the top of the water receiving tray 090 and causing water leakage in the housing.

[0062] Specifically, the fresh air inlet 140 is also provided with an air valve 170 and a filter 160. The filter 160 can filter the fresh air to prevent dust from entering the room and to prevent the condensed water in the water tray 090 from being polluted. The air valve 170 can open and close the fresh air inlet 140, that is, it can be opened when fresh air needs to be introduced.

[0063] Specifically, the humidifier 070 is a wet film humidifier, which is a built-in humidification device of the air conditioner, mainly composed of a wet film, a fan motor, a fan blade, a water pump 100, an electric control, etc. The core component of the humidification system is the evaporation medium - the wet film. Its material is made of plant fiber or glass fiber added with special chemical raw materials, and has good water absorption and evaporation properties.

[0064] Specifically, the fresh air fan 060 is a centrifugal fan, that is, after the fresh air passes through the wet film humidifier, it can be better delivered to the fresh air outlet 050 through the centrifugal fan. The circulation fan 010 is an axial flow fan, which blows directly into the air duct 130, has a high wind pressure, and is convenient for heat exchange between the cold air and the fresh air in the air duct 130.

[0065] In addition, the heat exchange device actually belongs to the indoor unit, and there is also a matching refrigerant circulation system corresponding to the heat exchanger, which is not the focus of the present invention and will not be described in detail.

[0066] like Figure 6 As shown, the present invention also provides a control method for a heat exchange device, using the above-mentioned heat exchange device, comprising the steps of:

[0067] Detect the carbon dioxide concentration X1 and humidity W1 of the fresh-keeping room corresponding to the heat exchange device;

[0068] When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the fresh air humidification mode is operated, such as Figure 3 As shown, the air guide plate 180 is closed, and the water pump 100 of the humidifier 070, the solenoid valve 040 and the fresh air fan 060 are turned on. At this time, the heat exchanger and the circulating fan 010 also remain in operation. After the outdoor fresh air is filtered by the filter, it enters from the fresh air inlet 140, passes through the air valve 170, and reaches the air duct 130 in the upper air chamber 150. The outdoor fresh air and the indoor cold air exchange heat in the heat exchange chamber 190 through the air duct 130. The temperature of the fresh air is reduced, and condensed water is generated in the air duct 130. The fresh air follows the air duct 130 to the lower air chamber 110, and the condensed water flows along the air duct 130 to the water receiving tray 090. The water pump 100 transfers the water in the water receiving tray 090 to the wet film humidifier through the solenoid valve 040 for use. The wet film humidifier decomposes the water into water mist. The fresh air is mixed with the water mist by the wet film humidifier and is blown to the fresh air outlet 050 by the fresh air fan 060 to complete the fresh air humidification function.

[0069] Specifically, when the carbon dioxide concentration X1 is less than or equal to the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the humidification mode is operated, such as Figure 5 As shown, the air guide plate 180 is opened, and the water pump 100 and the fresh air fan 060 of the humidifier 070 are turned on. The indoor air enters from the indoor air inlet 030, passes through the evaporator 020 (i.e., the heat exchanger) for cooling and reaches the evaporation chamber 200. The cold air of the evaporator 020 is blown into the heat exchange chamber 190 by the circulating fan 010. Part of the cold air goes out from the air outlet, and part of it enters the lower air chamber 110. The water pump 100 sends water to the wet film humidifier through the water pipe. The wet film humidifier decomposes the water into water mist. The cold air passes through the wet film humidifier and is mixed with the water mist and blown to the fresh air outlet 050 by the fresh air fan 060 to complete the humidification function.

[0070] When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is greater than or equal to the preset humidity W, the air guide plate 180 is closed and the fresh air blower 060 is turned on. Figure 5 As shown, after being filtered by the filter, the outdoor fresh air enters from the fresh air inlet 140, passes through the air valve 170, and reaches the air duct 130 in the upper air chamber 150. The outdoor fresh air and the indoor cold air are heat exchanged through the air duct 130 in the heat exchange chamber 190. The fresh air temperature is reduced, and condensed water is generated in the air duct 130. The fresh air follows the air duct 130 to reach the lower air chamber 110, and the condensed water flows along the air duct 130 to the water receiving tray 090. The fresh air is blown to the fresh air outlet 050 by the centrifugal fan through the wet film humidifier to complete the fresh air function. At the same time, the fresh air can be pre-cooled by heat exchange with the indoor cold air to avoid the excessively high fresh air temperature affecting the temperature inside the warehouse, resulting in excessive temperature fluctuations inside the warehouse.

[0071] It should be noted that the preset carbon dioxide concentration X and the preset humidity W are range values, that is, they have deviation values, so as to avoid frequent switching of modes and resulting in temperature fluctuations when the detected values ​​are near the preset values.

[0072] The present invention introduces fresh air through the air duct, utilizes the intersection of outdoor fresh air and indoor cold air, and the intersection of cold and hot produces condensed water to provide clean water for the wet film humidifier, and can also improve the indoor air through the fresh air; this patent uses the air duct to exchange heat between outdoor fresh air and indoor cold air, thereby lowering the fresh air temperature and reducing warehouse temperature fluctuations.

[0073] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0075] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0076] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0077] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat exchange device, characterized in that: include: A housing, wherein a circulation cavity is provided in the housing, and an indoor air inlet and an indoor air outlet connected to the circulation cavity, and the housing is further provided with a fresh air inlet, a lower air cavity, and a fresh air outlet connected to the lower air cavity; An air duct, the air duct is arranged in the circulation cavity, and one end of the air duct is connected to the fresh air inlet, and the other end is inclined downward to connect to the lower air cavity to form a fresh air flow channel; A water receiving tray is arranged at the bottom of the lower air chamber and can receive condensed water formed in the air duct; A heat exchanger and a circulation fan are arranged in the circulation chamber and can provide cold air flowing through the outer wall of the air duct; A humidifier and a fresh air blower are arranged on the fresh air flow channel, and the humidifier is connected to the water receiving tray through a water supply pipe.

2. The heat exchange device according to claim 1, characterized in that: An air guide plate is provided on the upper part of the lower air chamber. When the air guide plate is closed, the lower air chamber is separated from the circulation chamber, and when the air guide plate is opened, the circulation chamber is connected with the lower air chamber.

3. The heat exchange device according to claim 2, characterized in that: An upper wind cavity is arranged inside the fresh air inlet, the position of the upper wind cavity is higher than the position of the lower wind cavity, and the air duct is obliquely connected between the upper wind cavity and the lower wind cavity.

4. The heat exchange device according to claim 1, characterized in that: The fresh air inlet is arranged on one side of the shell, the indoor air inlet is arranged above the other side, and the fresh air outlet is arranged below the other side. The heat exchanger is arranged on the inner side of the indoor air inlet, and the lower air chamber, humidifier and fresh air fan are arranged side by side on the inner side of the fresh air outlet.

5. The heat exchange device according to claim 4, characterized in that: The circulation fan is obliquely arranged at the corner of the circulation cavity, and the air entering laterally from the indoor air inlet is blown obliquely downward from the corner.

6. The heat exchange device according to claim 3, characterized in that: The air duct comprises: a plurality of spaced parallel connecting pipes, the connecting pipes are arranged in a plurality of horizontal rows, and two vertically adjacent horizontal rows are staggered.

7. The heat exchange device according to claim 1, characterized in that: A water pump connected to the water supply pipeline is arranged in the water receiving tray, and a solenoid valve is arranged on the water supply pipeline.

8. The heat exchange device according to claim 1, characterized in that: An overflow port is arranged on the side of the water receiving tray.

9. A method for controlling a heat exchange device, characterized in that: Using the heat exchange device according to any one of claims 2 to 8 comprises the steps of: Detecting the carbon dioxide concentration X1 and humidity W1 of the fresh-keeping store corresponding to the heat exchange device; When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the air guide plate is closed, and the water pump of the humidifier and the fresh air blower are turned on.

10. The control method of the heat exchange device according to claim 9, characterized in that: When the carbon dioxide concentration X1 is less than or equal to the preset carbon dioxide concentration X, and the humidity W1 is less than the preset humidity W, the air guide plate is opened, and the water pump of the humidifier and the fresh air blower are turned on.

11. The control method of the heat exchange device according to claim 9, characterized in that: When the carbon dioxide concentration X1 is greater than the preset carbon dioxide concentration X, and the humidity W1 is greater than or equal to the preset humidity W, the air guide plate is closed and the fresh air blower is turned on.

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