Heat exchange device, control method and air conditioner

Abstract

This invention discloses a heat exchange device, a control method, and an air conditioner. The heat exchange device includes: a housing comprising an upper housing and a lower housing that are interconnected, the upper housing being positioned above the lower housing, and the lower housing having an air inlet and an air outlet; a surface cooler disposed within the upper housing; and an indirect evaporative cooler disposed within the lower housing, the indirect evaporative cooler including a first fresh air channel and a second fresh air channel; the inlet of the first fresh air channel forms a second channel with the upper housing, and the lower housing also includes the first channel, the inlet of which connects to the air inlet, and the outlet of which connects to the upper housing. This invention enables switching between multiple heat exchange modes, allowing for flexible adjustment of the heat exchange capacity based on the outdoor ambient temperature.

Description

Technical Field

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

[0002] Some of the existing evaporative cooling air-conditioning units and evaporative cooling air-conditioning systems directly utilize evaporative heat exchange, and their temperature and humidity control is unstable, which will lead to high indoor pollutant concentrations when the outdoor air quality is poor; some have a single working mode and cannot switch to different operating modes according to the outdoor fresh air temperature, that is, they cannot flexibly adjust the heat exchange amount according to weather conditions.

[0003] With regard to the problem that the air conditioning system in the prior art cannot flexibly adjust the heat exchange amount according to weather conditions, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a heat exchange device, a control method and an air conditioner to solve the problem that the air conditioning system in the prior art cannot flexibly adjust the heat exchange amount according to weather conditions.

[0005] In order to solve the above technical problems, the present invention provides a heat exchange device, which comprises:

[0006] The shell comprises an upper shell and a lower shell which are connected to each other, the upper shell is arranged above the lower shell, and the lower shell is provided with an air inlet and an air outlet;

[0007] A surface cooler is arranged in the upper shell;

[0008] An indirect evaporative cooler is arranged in the lower shell, and the indirect evaporative cooler includes a first fresh air channel and a second fresh air channel; a second channel is formed between the inlet of the first fresh air channel and the upper shell, and the lower shell also includes a first channel, the inlet of the first channel is connected to the air inlet, and the outlet is connected to the upper shell.

[0009] Furthermore, the heat exchange device further comprises:

[0010] The temperature sensor is arranged at the air inlet and is used to detect the temperature of the fresh air introduced into the air inlet.

[0011] Furthermore, the heat exchange device further comprises:

[0012] The fan is arranged in the lower shell body, adjacent to the side of the air inlet, and is used to introduce fresh air into the first channel and / or the second channel.

[0013] Furthermore, the inlet of the second fresh air channel is connected to the first channel, and the outlet of the second fresh air channel is the exhaust port.

[0014] Furthermore, the second channel also includes:

[0015] The first air valve is arranged at the entrance of the second fresh air channel.

[0016] Furthermore, the heat exchange device further comprises: a water inlet structure, the water inlet structure comprising a first water inlet, a second water inlet and a water outlet, the first water inlet is connected to the condensation pipeline, the second water inlet is connected to the waste hot water pipeline, and the water outlet is connected to the water inlet of the indirect evaporative cooler; the first water inlet is higher than the water outlet;

[0017] A spray device, arranged at the water outlet, for spraying the condensed water or waste hot water into the indirect evaporative cooler to exchange heat with the evaporative cooler;

[0018] A first valve, disposed between the first water inlet and the water outlet;

[0019] The second valve is arranged between the second water inlet and the water outlet.

[0020] Furthermore, the heat exchange device further comprises:

[0021] a water collector, arranged between the first water inlet and the spraying device,

[0022] A liquid level sensor is arranged in the water collector and is used to detect the liquid level height in the water collector;

[0023] a drain pipe, connected to the indirect evaporative cooler, for discharging condensed water after heat exchange;

[0024] The third valve is arranged on the drain pipe.

[0025] Furthermore, the upper shell is also provided with:

[0026] The second air valve is arranged adjacent to the surface cooler and is used to control the fresh air to be discharged from the surface cooler or the second air valve.

[0027] Furthermore, the first channel is also provided with:

[0028] a third air valve, located at the entrance of the first channel;

[0029] a fourth air valve, located at the outlet of the first channel;

[0030] The fifth air valve is located at the entrance of the second channel.

[0031] The present invention also provides an air conditioner, comprising the above-mentioned heat exchange device.

[0032] The present invention also provides a control method, which is applied to the above heat exchange device, and the control method comprises:

[0033] Determining a heat exchange mode of the heat exchange device; wherein the heat exchange mode includes a cooling mode and a heating mode;

[0034] If the heat exchange mode is the cooling mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in cooling according to the temperature of the fresh air introduced into the lower shell;

[0035] If the heat exchange mode is a heating mode, whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in heating is controlled according to the temperature of the fresh air introduced into the lower shell.

[0036] Furthermore, according to the temperature of the fresh air introduced into the lower shell, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in refrigeration, including:

[0037] If the temperature of the fresh air introduced into the lower shell is greater than a first temperature threshold, controlling both the indirect evaporative cooler and the surface cooler to participate in refrigeration;

[0038] If the temperature of the fresh air introduced into the lower shell is less than or equal to the first temperature threshold and greater than the second temperature threshold, the surface cooler is controlled to participate in refrigeration, and the indirect evaporative cooler is not controlled to participate in refrigeration;

[0039] If the temperature of the fresh air introduced into the lower shell is less than or equal to the second temperature threshold, the indirect evaporative cooler and the surface cooler are controlled not to participate in refrigeration.

[0040] Further, controlling the indirect evaporative cooler and the surface cooler to participate in refrigeration includes: controlling the first air valve, the third air valve, the fifth air valve, and the third valve to be opened, controlling the second air valve and the fourth air valve, the first valve, and the second valve to be closed, and controlling the indirect evaporative cooler and the surface cooler to operate in refrigeration;

[0041] Controlling the surface cooler to participate in refrigeration and the indirect evaporative cooler not to participate in refrigeration, including: controlling the third air valve and the fourth air valve to open, controlling the first air valve, the second air valve, the fifth air valve, the first valve, the second valve and the third valve to close, and controlling the indirect evaporative cooler to stop running, and the surface cooler to run for refrigeration;

[0042] Controlling the indirect evaporative cooler and the surface cooler to not participate in refrigeration, including: controlling the second air valve, the third air valve, the fourth air valve and the fifth air valve to open, controlling the first air valve, the first valve, the second valve and the third valve to close, and controlling the surface cooler and the indirect evaporative cooler to stop running;

[0043] Among them, the first air valve is arranged at the entrance of the second fresh air channel, the second air valve is arranged adjacent to the surface cooler, the third air valve is arranged at the entrance of the first channel, the fourth air valve is arranged at the outlet of the first channel, and the fifth air valve is arranged at the entrance of the second channel. The first valve is arranged between the first water inlet and the water outlet of the water inlet mechanism, the second valve is arranged between the second water inlet and the water outlet of the water inlet mechanism, and the third valve is arranged on the drain pipe, and the drain pipe is connected with the second channel.

[0044] Further, according to the temperature of the fresh air introduced into the lower shell, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled whether to participate in heating, including:

[0045] If the temperature of the fresh air introduced into the lower shell is less than or equal to a third temperature threshold, controlling the indirect evaporative cooler and the surface cooler to participate in heating;

[0046] If the temperature of the fresh air introduced into the lower shell is greater than a third temperature threshold, the indirect evaporative cooler is controlled to participate in heating, and the surface cooler is controlled not to participate in heating.

[0047] Further, controlling the indirect evaporative cooler and the surface cooler to participate in heating includes: controlling the fifth air valve, the second valve and the third valve to open, controlling the first air valve, the second air valve, the third air valve, the fourth air valve and the first valve to close, and controlling the surface cooler and the indirect evaporative cooler to operate in heating;

[0048] Controlling the indirect evaporative cooler to participate in heating, and controlling the surface cooler not to participate in heating, including: controlling the second air valve, the fifth air valve, the second valve, and the third valve to open, controlling the first air valve, the third air valve, the fourth air valve, and the first valve to close, and controlling the surface cooler to stop running, and the indirect evaporative cooler to run for heating;

[0049] Wherein, the third valve is arranged on a drain pipe, and the drain pipe is communicated with the second channel.

[0050] The present invention also provides a computer-readable storage medium on which a computer program is stored, and the program implements the above control method when executed by a processor.

[0051] By applying the technical solution of the present invention, a lower shell and an upper shell are set, and the lower shell is divided into a first channel and a second channel. An indirect evaporative cooler is set in the second channel, and a surface cooler is set in the upper shell. No heat exchanger is set in the first channel. A variety of heat exchange modes can be switched to achieve flexible adjustment of the heat exchange amount according to the outdoor ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a top view of a heat exchange device according to an embodiment of the present invention;

[0053] Figure 2 for Figure 1 A cross-sectional view of the heat exchange device along line DD′;

[0054] Figure 3 is an internal structural diagram of an indirect evaporative cooler according to an embodiment of the present invention;

[0055] Figure 4 is a flow chart of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0058] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] It should be understood that although the terms first, second, third, etc. may be used to describe the air valves in the embodiments of the present invention, the air valves should not be limited to these terms. These terms are only used to distinguish different air valves. For example, without departing from the scope of the embodiments of the present invention, the first air valve may also be referred to as the second air valve, and similarly, the second air valve may also be referred to as the first air valve.

[0060] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0061] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0062] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0063] Example 1

[0064] This embodiment provides a heat exchange device, Figure 1 is a top view of a heat exchange device according to an embodiment of the present invention, Figure 2 for Figure 1 The cross-sectional view of the heat exchange device along the DD′ line is as follows: Figure 1 and Figure 2 As shown, the heat exchange device includes: a shell, the shell includes an upper shell 1 and a lower shell 5 connected by a vertical channel 30, the upper shell 1 is arranged above the lower shell 5, the upper shell 1 is provided with a fresh air outlet 3, and the lower shell 5 is provided with an air inlet 9 and an air outlet 13; a surface cooler 2 is arranged in the upper shell 1; an indirect evaporative cooler 6 is arranged in the lower shell 5, and the indirect evaporative cooler 6 includes a first fresh air channel 61 and a second fresh air channel 62; a second channel 52 is formed between the inlet of the first fresh air channel and the upper shell 1, and the lower shell 5 also includes a first channel 51, the inlet of the first channel 51 is connected to the air inlet 9, and the outlet is connected to the upper shell 1;

[0065] The heat exchange device of this embodiment is provided with a lower shell and an upper shell, and the lower shell is divided into a first channel and a second channel. An indirect evaporative cooler is provided in the second channel, and a surface cooler is provided in the upper shell. No heat exchanger is provided in the first channel. A variety of heat exchange modes can be switched to achieve flexible adjustment of the heat exchange amount according to the outdoor ambient temperature.

[0066] like Figure 1As shown, the heat exchange device further includes: a temperature sensor 10 , which is arranged at the air inlet 9 of the lower shell 5 and is used to detect the temperature of the fresh air introduced by the air inlet 9 .

[0067] In order to achieve fan sharing, reduce the number of fans and save costs, the above-mentioned heat exchange device also includes: a fan 11, which is arranged in the lower shell 5, adjacent to the side of the air inlet 9 of the lower shell 5, for introducing fresh air into the first channel 51 and the second channel 52.

[0068] Figure 3 : is an internal structure diagram of an indirect evaporative cooler according to an embodiment of the present invention, as shown in FIG. Figure 3 As shown, the indirect evaporative cooler 6 comprises:

[0069] The fresh air introduced into the first fresh air channel 61 and the second channel 52 flows through the indirect evaporative cooler 6 along the first fresh air channel 61, and the direction of the fresh air is direction B.

[0070] The second fresh air channel 62, the fresh air introduced into the second fresh air channel 62 exchanges heat with the wet channel 63 of the indirect evaporative cooler 6 and the first fresh air channel 61. The direction of the working air in the second fresh air channel 62 is the A direction.

[0071] The wet channel 63 , the condensed water flows through the indirect evaporative cooler 6 in a vertical direction through the wet channel 63 , and the flow direction of the condensed water in the wet channel is a C direction.

[0072] In this embodiment, the inlet 12 of the second fresh air channel 62 is communicated with the first channel 51 , and fresh air is introduced from the first channel 51 . The outlet of the second fresh air channel 62 is the exhaust port 13 .

[0073] In other embodiments of the present invention, the inlet 12 of the second fresh air passage may also be directly connected to the outdoor space to directly introduce fresh air.

[0074] In order to control and switch the flow direction of the fresh air, the second channel 52 further includes: a first air valve 14 disposed at the inlet 12 of the second fresh air channel 62 .

[0075] In order to achieve evaporative cooling and heating, when cooling, the indirect evaporative cooler 6 needs to introduce condensed water with a lower temperature, and when heating, the indirect evaporative cooler 6 needs to introduce waste hot water with a higher temperature. Figure 2As shown, the heat exchange device also includes: the heat exchange device also includes: a water inlet structure, the water inlet structure includes a first water inlet 15, a second water inlet 18 and a water outlet, the first water inlet 15 is connected to the condensation pipeline, the second water inlet 18 is connected to the waste hot water pipeline, and the water outlet is connected to the water inlet of the indirect evaporative cooler 6; in order to realize the condensed water's own gravity to make the condensed water flow in the above-mentioned wet channel 63, the height of the first water inlet 15 is higher than the water outlet; a spray device 16, arranged at the water outlet, is used to spray condensed water or waste hot water into the indirect evaporative cooler 6 to exchange heat with the evaporative cooler 6; a first valve 17, is arranged between the first water inlet 15 and the water outlet; a second valve 19, is arranged between the second water inlet 18 and the water outlet, and a water pump 20 is also arranged between the second water inlet 18 and the water outlet to drive the flow of waste hot water.

[0076] To store condensed water for easy discharge from the spraying device, such as Figure 2 As shown, the heat exchange device further includes: a water collector 31, which is arranged between the first water inlet 15 and the spray device 16, and is used to store condensed water; a liquid level sensor 21, which is arranged in the water collector 31, and is used to detect the liquid level height in the water collector 31; a drain pipe 22, which is connected to the indirect evaporative cooler 6, and is used to discharge the water in the indirect evaporative cooler 6. A third valve 23 is also arranged on the drain pipe 22, which is used to control whether the water in the drain pipe 22 is discharged. In order to realize the spraying by the gravity of the condensed water itself and save power, the vertical height of the first water inlet 15 is higher than the spray device 16.

[0077] In order to control whether the fresh air flows through the surface cooler 2, Figure 1 As shown, the upper shell 1 further includes: a second air valve 24, which is arranged adjacent to the surface cooler 2 and is used to control the fresh air to be discharged from either the surface cooler 2 or the second air valve 24.

[0078] In order to control the fresh air to flow into the first channel 51 or the second channel 52 , the first channel 51 is further provided with: a third air valve 25 located at the entrance of the first channel 51 ; a fourth air valve 26 located at the exit of the first channel 51 ; and a fifth air valve 27 located at the entrance of the second channel 52 .

[0079] In order to ensure the quality of fresh air, Figure 1 As shown, the heat exchange device further includes: a primary filter 28 disposed between the fan 11 and the air inlet 9 , and a secondary filter 29 disposed between the vertical channel 30 and the surface cooler 2 .

[0080] In order to prevent the condensed water from overflowing, the heat exchange device further includes a first water receiving pan 32 disposed at the bottom of the surface cooler 2 ; and a second water receiving pan 33 disposed at the bottom of the indirect evaporative cooler 6 .

[0081] Example 2

[0082] This embodiment provides an air conditioner, comprising the heat exchange device in the above embodiment.

[0083] Example 3

[0084] This embodiment provides a control method, using the heat exchange device in the above embodiment, Figure 4 is a flow chart of a control method according to an embodiment of the present invention, as shown in Figure 4 As shown, the control method includes:

[0085] S101, determining a heat exchange mode of a heat exchange device; wherein the heat exchange mode includes a cooling mode and a heating mode.

[0086] S102, if the heat exchange mode is the cooling mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in cooling according to the temperature of the fresh air introduced into the lower shell.

[0087] S103, if the heat exchange mode is the heating mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in heating according to the temperature of the fresh air introduced into the lower shell.

[0088] The control method of this embodiment, when the heat exchange mode is the cooling mode, controls whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in cooling according to the temperature of the fresh air introduced into the lower shell. When the heat exchange mode is the heating mode, controls whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in heating according to the temperature of the fresh air introduced into the lower shell. The heat exchange amount can be flexibly adjusted according to the outdoor ambient temperature.

[0089] In order to accurately control the cooling capacity according to the outdoor temperature in the cooling mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in the cooling according to the temperature of the fresh air introduced by the lower shell, including: if the temperature of the fresh air introduced by the lower shell is greater than the first temperature threshold, the indirect evaporative cooler and the surface cooler are controlled to participate in the cooling; if the temperature of the fresh air introduced by the lower shell is less than or equal to the first temperature threshold, and greater than the second temperature threshold, the surface cooler is controlled to participate in the cooling, and the indirect evaporative cooler is not controlled to participate in the cooling; if the temperature of the fresh air introduced by the lower shell is less than or equal to the second temperature threshold, the indirect evaporative cooler and the surface cooler are controlled not to participate in the cooling. Among them, the temperature threshold that the above-mentioned first temperature threshold is greater than, the first temperature threshold and the second temperature threshold can both be measured by experiments.

[0090] Specifically, controlling the indirect evaporative cooler and the surface cooler to participate in refrigeration includes: controlling the first air valve 14, the third air valve 25, the fifth air valve 27 and the third valve 23 to open, controlling the second air valve 24 and the fourth air valve 26, the first valve 17 and the second valve 19 to close, and controlling the indirect evaporative cooler 6 and the surface cooler 2 to both operate in refrigeration; controlling the surface cooler to participate in refrigeration, and the indirect evaporative cooler not to participate in refrigeration, includes: controlling the third air valve 25 and the fourth air valve 26 to open, controlling the first air valve 14, the second air valve 24, the fifth air valve 27, the first valve 17, the second valve 19 and the third valve 23 to close, and controlling the indirect evaporative cooler 6 to stop operating, and the surface cooler 2 to operate in refrigeration; controlling the indirect evaporative cooler and the surface cooler not to participate in refrigeration includes: The second air valve 24, the third air valve 25, the fourth air valve 26 and the fifth air valve are controlled to be opened, the first air valve 14, the first valve 17, the second valve 19 and the third valve 23 are controlled to be closed, and the surface cooler 2 and the indirect evaporative cooler 6 are controlled to stop running; wherein, the first air valve 14 is arranged at the entrance of the second fresh air channel, the second air valve 24 is arranged adjacent to the surface cooler, the third air valve 25 is arranged at the entrance of the first channel 51, the fourth air valve 26 is arranged at the outlet of the first channel 51, the fifth air valve 27 is arranged at the entrance of the second channel 52, the first valve 17 is arranged between the first water inlet 15 and the spray device 16, the second valve 19 is arranged between the second water inlet 18 and the spray device 16, and the third valve 23 is arranged on the drain pipe, and the drain pipe is connected to the second channel 52.

[0091] In order to achieve accurate control of the heating amount according to the outdoor temperature in the heating mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in the heating according to the temperature of the fresh air introduced by the lower shell, including: if the temperature of the fresh air introduced by the lower shell is less than or equal to the third temperature threshold, the indirect evaporative cooler and the surface cooler are both controlled to participate in the heating; if the temperature of the fresh air introduced by the lower shell is greater than the third temperature threshold, the indirect evaporative cooler is controlled to participate in the heating, and the surface cooler 2 is controlled not to participate in the heating.

[0092] Specifically, controlling the indirect evaporative cooler and the surface cooler to participate in heating includes: controlling the fifth air valve 27, the second valve 19 and the third valve 23 to open, controlling the first air valve 14, the second air valve 24, the third air valve 25, the fourth air valve 26 and the first valve 17 to close, and controlling the surface cooler and the indirect evaporative cooler to operate for heating; controlling the indirect evaporative cooler to participate in heating and controlling the surface cooler not to participate in heating includes: controlling the second air valve 24, the fifth air valve 27, the second valve 19 and the third valve 23 to open, controlling the first air valve 14, the third air valve 25, the fourth air valve 26 and the first valve 17 to close, and controlling the surface cooler 2 to stop operating and the indirect evaporative cooler 6 to operate for heating. The third temperature threshold is lower than the second temperature threshold, and the specific value of the third temperature threshold can be measured experimentally in the heating mode.

[0093] The above control method can be applied to a single-fan evaporative cooling air conditioning system, which can provide cold air or hot air for a room. In a preferred embodiment of the present invention, the above control method includes the following preferred steps:

[0094] In summer cooling, the air conditioning system can switch to three working modes according to the value range of the fresh air temperature T (T≤t2, t1<T≤t2,T> t1), the user can reasonably set the t1 and t2 values ​​according to the actual situation. The specific working process is as follows:

[0095] (a)T>t1

[0096] In extremely hot summer, the indoor fresh air temperature requirement is relatively high, and the primary cooling often cannot meet the indoor temperature requirement. The indirect evaporative cooler 6 and the surface cooler 2 are combined for secondary cooling to make the fresh air in the room meet the design requirements. When the fresh air temperature is greater than t1, the first air valve 14, the third air valve 25, the fifth air valve 27 and the third valve 23 are controlled to be opened, the second air valve 24 and the fourth air valve 26, the first valve 17 and the second valve 19 are controlled to be closed, and the indirect evaporative cooler 6 and the surface cooler 2 are controlled to operate in cooling mode. At this time, condensed water is sprayed from the spray device 16, and condensed water is always discharged from the drain pipe 22, so the third valve 23 is always open. When the condensed water of the device is insufficient, the condensed water in the water collector 31 is lower than the set liquid level h1, and the first valve 17 is opened to connect the condensed water of other surface coolers.

[0097] like Figure 1As shown, outdoor fresh air enters the unit from the fresh air inlet 9, and passes through the primary filter 28 to filter large particle pollutants in the air. The fan 11 sends fresh air into the first channel 51 and the second channel 52 respectively. The air in the first channel 51 enters the second fresh air channel of the indirect evaporative cooler 6 through the first air valve 14 and the inlet 12 of the first fresh air channel as working air; the air in the second channel 52 enters the first fresh air channel of the indirect evaporative cooler 6 through the indoor fresh air inlet 4 as use air. In the indirect evaporative cooler 6, the working air and the condensed water are directly contacted in the wet channel for isenthalpic cooling, and then indirectly take away the heat in the use air through the heat exchanger, thereby achieving the effect of isohumidification cooling of the use air. After being cooled by the indirect evaporative cooler 6, the use air passes through the vertical channel 30 to enter the intermediate filter 29 for filtration, and then enters the surface cooler 2 for secondary cooling. After reaching the required indoor temperature, it finally enters the room through the fresh air outlet 3. A liquid level sensor 21 is installed in the water collector 31. When the condensed water in the water collector 31 is lower than the set liquid level h1, the first valve 17 is opened, and the condensed water from other terminal devices can be supplemented through the external first water inlet 15. When the condensed water in the water collector 31 is higher than the set liquid level h2 (h2>h1), the first valve 17 is closed and finally discharged from the drain pipe 22.

[0098] (b)t2 <T≤t1

[0099] When the summer fresh air temperature is between t2 and t1, and only one cooling is needed to make the fresh air temperature reach the indoor design temperature requirement, the third air valve 25 and the fourth air valve 26 are controlled to be opened, the first air valve 14, the second air valve 24, the fifth air valve 27, the first valve 17, the second valve 19 and the third valve 23 are controlled to be closed, and the indirect evaporative cooler 6 is controlled to stop running, and the surface cooler 2 is operated for cooling.

[0100] like Figure 1 As shown, outdoor fresh air is sent into the first channel 51 by the fan 11, and directly enters the surface cooler 2 for cooling after passing through the fourth air valve 26, the vertical channel 30, and the intermediate filter 29. When the design temperature is reached, it is sent into the room through the fresh air outlet 3, and the condensed water is discharged from the drain pipe 22. At this time, the fan only needs to supply air to one channel, the air volume required to be transported is reduced, the fan frequency is reduced, and the energy consumption is reduced.

[0101] (c)T≤t2

[0102] In the transition season, the outdoor fresh air temperature is often low and can meet the indoor load demand without cooling. When the fresh air temperature is less than or equal to t2, the second air valve 24, the third air valve 25, the fourth air valve 26, and the fifth air valve 27 are controlled to be opened, the first air valve 14, the first valve 17, the second valve 19, and the third valve 23 are controlled to be closed, and the surface cooler 2 and the indirect evaporative cooler 6 are controlled to stop operating.

[0103] like Figure 1 As shown, outdoor fresh air is sent into the first channel 51 and the second channel 52 by the fan 11, and finally sent into the room through the fresh air outlet 3 after entering the vertical channel 30. At this time, no condensed water passes through the surface cooler 2, and there is no working air in the indirect evaporative cooler 6, and the indoor load is completely borne by the outdoor fresh air. In this mode, the ventilation area is increased, the air outlet pressure is reduced, the fan frequency is reduced, and the energy consumption is reduced. On the other hand, the host does not need to provide chilled water for the surface cooler 2, which reduces the host operation time and reduces the operation cost of the air conditioning system.

[0104] When heating in winter, there are two working modes (T≤t3, T>t3) according to the parameter size of the fresh air temperature T. Users can reasonably set the t3 value according to actual conditions. The specific working process is as follows:

[0105] (d)T≤t3

[0106] The indirect evaporative cooler 6 and the surface cooler can be combined to provide hot air for the room. The fifth air valve 27, the second valve 19 and the third valve 23 are controlled to be opened, the first air valve 14, the second air valve 24, the third air valve 25, the fourth air valve 26 and the first valve 17 are controlled to be closed, and the surface cooler 2 and the indirect evaporative cooler 6 are controlled to operate for heating.

[0107] like Figure 1 As shown, fresh air is sent into the second channel 52 by the fan 11, preheated with the filtered waste hot water in the external water pipe in the indirect evaporative cooler 6, and then enters the surface cooler from the vertical channel 30 for heat exchange, and the heated air enters the room through the fresh air outlet 3. The waste hot water is transported to the spray device 16 by the water pump 28 and discharged from the drain pipe 22.

[0108] (e)T>t3

[0109] At this time, the surface cooler can be used for heating without using the second air valve 24, the fifth air valve 27, the second valve 19 and the third valve 23, and the first air valve 14, the third air valve 25, the fourth air valve 26 and the first valve 17 are controlled to be closed, and the surface cooler 2 is controlled to stop running, and the indirect evaporative cooler 6 is operated for heating. The fresh air is sent into the second channel 52 by the fan 11, and exchanges heat with the filtered waste hot water in the external water pipe in the indirect evaporative cooler 6. After taking part of the indoor load, it passes through the second air valve 24, and finally the heated air enters the room through the fresh air outlet 3. The waste hot water is sent to the spray device 16 by the water pump 28 and discharged from the drain pipe 22.

[0110] Example 4

[0111] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the control method of the above embodiment is implemented.

[0112] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchange device, characterized in that: The heat exchange device comprises: A shell, the shell comprising an upper shell and a lower shell that are connected to each other, the upper shell is arranged above the lower shell, and the lower shell is provided with an air inlet and an air outlet; A surface cooler is arranged in the upper shell; An indirect evaporative cooler is arranged in the lower shell, and the indirect evaporative cooler includes a first fresh air channel and a second fresh air channel; a second channel is formed between the inlet of the first fresh air channel and the upper shell, and the lower shell also includes a first channel, the inlet of the first channel is connected to the air inlet, and the outlet is connected to the upper shell; The second channel also includes: a first air valve, which is arranged at the entrance of the second fresh air channel; The heat exchange device further includes: a water inlet structure, the water inlet structure including a first water inlet, a second water inlet and a water outlet, the first water inlet is connected to a condensation pipeline, the second water inlet is connected to a waste hot water pipeline, and the water outlet is connected to a water inlet of the indirect evaporative cooler; a first valve is arranged between the first water inlet and the water outlet; a second valve is arranged between the second water inlet and the water outlet; a drain pipe is connected to the indirect evaporative cooler and is used to discharge condensed water after heat exchange; a third valve is arranged on the drain pipe; The upper shell is also provided with: a second air valve, which is arranged adjacent to the surface cooler and is used to control the fresh air to be discharged from the surface cooler or the second air valve; The first channel is also provided with: a third air valve located at the entrance of the first channel; a fourth air valve located at the exit of the first channel; and a fifth air valve located at the entrance of the second channel.

2. The heat exchange device according to claim 1, characterized in that: The heat exchange device also includes: The temperature sensor is arranged at the air inlet and is used to detect the temperature of the fresh air introduced into the air inlet.

3. The heat exchange device according to claim 1, characterized in that: The heat exchange device also includes: The fan is arranged in the lower shell body, adjacent to the side of the air inlet, and is used to introduce fresh air into the first channel and / or the second channel.

4. The heat exchange device according to claim 1, characterized in that: The inlet of the second fresh air channel is connected to the first channel, and the outlet of the second fresh air channel is the exhaust port.

5. The heat exchange device according to claim 1, characterized in that: The heat exchange device also includes: A spraying device is arranged at the water outlet and is used to spray condensed water or waste hot water into the indirect evaporative cooler to exchange heat with the evaporative cooler.

6. The heat exchange device according to claim 5, characterized in that: The heat exchange device also includes: a water collector, arranged between the first water inlet and the spraying device, The liquid level sensor is arranged in the water collector and is used to detect the liquid level height in the water collector.

7. An air conditioner, characterized in that: A heat exchange device comprising any one of claims 1 to 6.

8. A control method, applied to the heat exchange device according to any one of claims 1 to 6, characterized in that: The control method comprises: Determining a heat exchange mode of the heat exchange device; wherein the heat exchange mode includes a cooling mode and a heating mode; If the heat exchange mode is the cooling mode, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in cooling according to the temperature of the fresh air introduced into the lower shell; If the heat exchange mode is a heating mode, whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in heating is controlled according to the temperature of the fresh air introduced into the lower shell.

9. The control method according to claim 8, characterized in that: According to the temperature of the fresh air introduced into the lower shell, the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell are controlled to participate in refrigeration, including: If the temperature of the fresh air introduced into the lower shell is greater than a first temperature threshold, controlling both the indirect evaporative cooler and the surface cooler to participate in refrigeration; If the temperature of the fresh air introduced into the lower shell is less than or equal to the first temperature threshold and greater than the second temperature threshold, the surface cooler is controlled to participate in refrigeration, and the indirect evaporative cooler is not controlled to participate in refrigeration; If the temperature of the fresh air introduced into the lower shell is less than or equal to the second temperature threshold, the indirect evaporative cooler and the surface cooler are controlled not to participate in refrigeration.

10. The control method according to claim 9, characterized in that: Controlling the indirect evaporative cooler and the surface cooler to participate in refrigeration, including: controlling the first air valve, the third air valve, the fifth air valve and the third valve to open, controlling the second air valve and the fourth air valve, the first valve and the second valve to close, and controlling the indirect evaporative cooler and the surface cooler to operate in refrigeration; Controlling the surface cooler to participate in refrigeration and the indirect evaporative cooler not to participate in refrigeration, including: controlling the third air valve and the fourth air valve to open, controlling the first air valve, the second air valve, the fifth air valve, the first valve, the second valve and the third valve to close, and controlling the indirect evaporative cooler to stop running, and the surface cooler to run for refrigeration; Controlling the indirect evaporative cooler and the surface cooler to not participate in refrigeration, including: controlling the second air valve, the third air valve, the fourth air valve and the fifth air valve to open, controlling the first air valve, the first valve, the second valve and the third valve to close, and controlling the surface cooler and the indirect evaporative cooler to stop running; Among them, the first air valve is arranged at the entrance of the second fresh air channel, the second air valve is arranged adjacent to the surface cooler, the third air valve is arranged at the entrance of the first channel, the fourth air valve is arranged at the outlet of the first channel, and the fifth air valve is arranged at the entrance of the second channel. The first valve is arranged between the first water inlet and the water outlet of the water inlet mechanism, the second valve is arranged between the second water inlet and the water outlet of the water inlet mechanism, and the third valve is arranged on the drain pipe, and the drain pipe is connected with the second channel.

11. The control method according to claim 8, characterized in that: Controlling whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in heating according to the temperature of the fresh air introduced into the lower shell, including: If the temperature of the fresh air introduced into the lower shell is less than or equal to a third temperature threshold, controlling the indirect evaporative cooler and the surface cooler to participate in heating; If the temperature of the fresh air introduced into the lower shell is greater than a third temperature threshold, the indirect evaporative cooler is controlled to participate in heating, and the surface cooler is controlled not to participate in heating.

12. The control method according to claim 11, characterized in that: Controlling the indirect evaporative cooler and the surface cooler to participate in heating, including: controlling the fifth air valve, the second valve and the third valve to open, controlling the first air valve, the second air valve, the third air valve, the fourth air valve and the first valve to close, and controlling the surface cooler and the indirect evaporative cooler to operate in heating; Controlling the indirect evaporative cooler to participate in heating and controlling the surface cooler not to participate in heating includes: controlling the second air valve, the fifth air valve, the second valve and the third valve to open, controlling the first air valve, the third air valve, the fourth air valve and the first valve to close, and controlling the surface cooler to stop running, and the indirect evaporative cooler to run for heating.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 8 to 12 is implemented.

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