CN115342464A - Heat exchange device, control method and air conditioner - Google Patents

Abstract

The invention discloses a heat exchange device, a control method and an air conditioner. Wherein, heat transfer device includes: the shell comprises an upper shell and a lower shell which are communicated with 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; the surface cooler is arranged in the upper shell; the indirect evaporative cooler is arranged in the lower shell and comprises 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, the lower shell also comprises a first channel, the inlet of the first channel is communicated with the air inlet, and the outlet of the first channel is communicated with the upper shell. By the invention, various heat exchange modes can be switched, and the heat exchange quantity can be flexibly adjusted according to the outdoor environment temperature.

Description

Heat exchange device, control method and air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to a heat exchange device, a control method and an air conditioner.

Background technique

Some of the existing evaporative cooling air-conditioning units and evaporative cooling air-conditioning systems directly use evaporative heat exchange, and the control of temperature and humidity is unstable. When the outdoor air quality is not good, the concentration of indoor pollutants will be high; some work modes are single, It is impossible to switch between different operating modes according to the outdoor fresh air temperature, that is, it is impossible to flexibly adjust the heat exchange according to the weather conditions.

Aiming at the problem that the air conditioning system in the prior art cannot flexibly adjust the heat exchange according to the weather conditions, no effective solution has been proposed yet.

Contents of the invention

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

In order to solve the above technical problems, the present invention provides a heat exchange device, which includes:

The casing includes an upper casing and a lower casing connected to each other, the upper casing is arranged above the lower casing, and the lower casing is provided with an air inlet and an air outlet;

A surface cooler is arranged in the upper shell;

The indirect evaporative cooler is arranged in the lower casing, and the indirect evaporative cooler includes a first fresh air passage and a second fresh air passage; a second fresh air passage is formed between the entrance of the first fresh air passage and the upper casing. The lower housing further includes a first channel, the inlet of the first channel communicates with the air inlet, and the outlet communicates with the upper housing.

Further, 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 by the air inlet.

Further, the heat exchange device also includes:

The fan is arranged in the lower housing, on a side close to the air inlet, and is used to introduce fresh air into the first channel and/or the second channel.

Further, 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 air outlet.

Further, the second channel also includes:

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

Further, the heat exchange device further includes: a water inlet structure, the water inlet structure includes a first water inlet, a second water inlet and a water outlet, the first water inlet communicates with the condensation pipeline, and the second The water inlet is connected to the waste water 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;

A spraying device, arranged at the water outlet, is used to spray the condensed water or waste hot water into the indirect evaporative cooler, and exchange heat with the evaporative cooler;

The first valve is arranged between the first water inlet and the water outlet;

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

Further, the heat exchange device also includes:

a water collector, disposed between the first water inlet and the spray device,

A liquid level sensor is arranged in the water collector and is used to detect the liquid level in the water collector;

Drain pipe, communicated with the indirect evaporative cooler, used to discharge the condensed water after heat exchange;

The third valve is arranged on the drain pipe.

Further, the upper casing is also provided with:

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

Further, the first channel is also set:

a third damper located at the entrance of the first channel;

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

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

The present invention also provides an air conditioner, including the above-mentioned heat exchange device.

The present invention also provides a control method, which is applied to the above-mentioned heat exchange device, and the control method includes:

Determine the 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 cooling mode, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in cooling according to the fresh air temperature introduced by the lower housing;

If the heat exchange mode is heating mode, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in heating according to the temperature of fresh air introduced from the lower housing.

Further, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in refrigeration according to the fresh air temperature introduced by the lower housing, including:

If the temperature of the fresh air introduced by the lower shell is greater than the first temperature threshold, control both the indirect evaporative cooler and the surface cooler to participate in 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 cooling, and the indirect evaporative cooler is not involved in cooling;

If the temperature of the fresh air introduced by the lower casing is less than or equal to the second temperature threshold, control the indirect evaporative cooler and the surface cooler to not participate in cooling.

Further, controlling both the indirect evaporative cooler and the surface cooler to participate in refrigeration includes: controlling the opening of the first air valve, the third air valve, the fifth air valve, and the third valve, and controlling the opening of the second air valve and the third air valve. The four air valves, the first valve and the second valve are closed, and the cooling operation of the indirect evaporative cooler and the surface cooler is controlled;

Controlling the surface cooler to participate in cooling, and the indirect evaporative cooler not to participate in cooling includes: controlling the opening of the third damper and the fourth damper, controlling the opening of the first damper and the second damper. valve, the fifth air valve, the first valve, the second valve and the third valve are closed, and the indirect evaporative cooler is controlled to stop running, and the surface cooler is refrigerated;

Controlling that neither the indirect evaporative cooler nor the surface cooler participates in refrigeration includes: controlling the opening of the second damper, the third damper, the fourth damper and the fifth damper, and controlling all The first air valve, the first valve, the second valve and the third valve are closed, and the surface cooler and the indirect evaporative cooler are controlled to stop running;

Wherein, the first air valve is arranged at the entrance of the second fresh air passage, the second air valve is arranged adjacent to the surface cooler, and the third air valve is arranged at the entrance of the first passage, so The fourth air valve is arranged at the outlet of the first passage, the fifth air valve is arranged at the entrance of the second passage, and 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, the third valve is arranged on the drain pipe, and the drain pipe communicates with the second channel.

Further, controlling whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in heating according to the fresh air temperature introduced by the lower housing includes:

If the temperature of the fresh air introduced by the lower shell is less than or equal to the third temperature threshold, control the indirect evaporative cooler and the surface cooler to participate in 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 heating, and the surface cooler is controlled not to participate in heating.

Further, controlling both the indirect evaporative cooler and the surface cooler to participate in heating includes: controlling the opening of the fifth air valve, the second valve, and the third valve, controlling the opening of the first air valve, the second air valve, and the second air valve. The third air valve, the fourth air valve and the first valve are closed, and the heating operation of the surface cooler and the indirect evaporative cooler is controlled;

Controlling the indirect evaporative cooler to participate in heating and controlling the surface cooler not to participate in heating includes: controlling the opening of the second damper, the fifth damper, the second valve and the third valve, controlling the first damper, The third air valve, the fourth air valve and the first valve are closed, and the surface cooler is controlled to stop running, and the indirect evaporative cooler is operated for heating;

Wherein, the third valve is arranged on the drain pipe, and the drain pipe communicates with the second channel.

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

Applying the technical solution of the present invention, the lower shell and the upper shell are arranged, the lower shell is divided into a first channel and a second channel, an indirect evaporative cooler is arranged in the second channel, and a surface cooler is arranged in the upper shell, There is no heat exchanger in the first channel, and multiple heat exchange modes can be switched to realize flexible adjustment of the heat exchange amount according to the outdoor ambient temperature.

Description of drawings

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

Fig. 2 is a sectional view of the heat exchange device of Fig. 1 along the D-D' line;

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

Fig. 4 is a flowchart of a control method according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

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 otherwise, "multiple" Generally contain at least two.

It should be understood that the term "and/or" used herein is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which may mean that A exists alone, and A and B exist simultaneously. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe dampers in the embodiments of the present invention, these dampers should not be limited to these terms. These terms are used only to distinguish the different dampers. For example, without departing from the scope of the embodiments of the present invention, the first damper may also be called the second damper, and similarly, the second damper may also be called the first damper.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" could be interpreted as "when determined" or "in response to the determination" or "when detected (the stated condition or event) )" or "in response to detection of (a stated condition or event)".

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or arrangement comprising a list of elements includes not only those elements but also includes items not expressly listed. other elements of the product, or elements inherent in the product or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising said element.

Optional embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1

This embodiment provides a heat exchange device. FIG. 1 is a top view of the heat exchange device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the heat exchange device in FIG. 1 along the line D-D', as shown in FIGS. 1 and 2 , the heat exchange device includes: a shell, the shell includes an upper shell 1 and a lower shell 5 communicated through a vertical passage 30, the upper shell 1 is arranged above the lower shell 5, and the upper shell 1 The fresh air outlet 3 is provided, and the lower casing 5 is provided with an air inlet 9 and an air outlet 13; the surface cooler 2 is arranged in the upper casing 1; the indirect evaporative cooler 6 is arranged in the lower casing 5 , and the indirect evaporative cooler 6 includes a first fresh air passage 61 and a second fresh air passage 62; a second passage 52 is formed between the entrance of the first fresh air passage and the upper casing 1, and the lower casing 5 also includes the first passage 51 , the inlet of the first channel 51 is connected to the air inlet 9, and the outlet is connected to the upper casing 1;

In the heat exchange device of this embodiment, a lower shell and an upper shell are provided, and the lower shell is divided into a first channel and a second channel, an indirect evaporative cooler is arranged in the second channel, and a surface cooler is arranged in the upper shell , There is no heat exchanger in the first channel, and it can switch multiple heat exchange modes to realize the flexible adjustment of the heat exchange amount according to the outdoor ambient temperature.

As shown in FIG. 1 , the heat exchange device further includes: a temperature sensor 10 disposed at the air inlet 9 of the lower shell 5 for detecting the temperature of fresh air introduced by the air inlet 9 .

In order to realize 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 and is adjacent to the side of the air inlet 9 of the lower shell 5, and is used to introduce fresh air into the first A channel 51 and a second channel 52 .

Fig. 3 is an internal structure diagram of an indirect evaporative cooler according to an embodiment of the present invention. As shown in Fig. 3, the indirect evaporative cooler 6 includes:

The first fresh air channel 61 and the fresh air introduced by the second channel 52 flow through the indirect evaporative cooler 6 along the first fresh air channel 61 , and the direction of the fresh air is B direction.

The second fresh air channel 62 , the fresh air introduced by 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 wind in the second fresh air passage 62 is the A direction.

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

In this embodiment, the inlet 12 of the second fresh air passage 62 communicates with the first passage 51 , and fresh air is introduced from the first passage 51 , and the outlet of the second fresh air passage 62 is the air outlet 13 .

In other embodiments of the present invention, the inlet 12 of the second fresh air channel may also directly communicate with the outdoor space to directly introduce fresh air.

In order to control and switch the flow direction of fresh air, the second passage 52 further includes: a first damper 14 , which is arranged at the entrance 12 of the second fresh air passage 62 .

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 higher temperature waste hot water. As shown in Figure 2, 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 communicates with the condensing pipeline, the second water inlet 18 communicates with the waste hot water pipeline, and the water outlet communicates with the water inlet of the indirect evaporative cooler 6; in order to realize the gravity of the condensed water itself to make the condensed water flow in the above-mentioned wet channel 63, the first The height of the water inlet 15 is higher than that of the water outlet; the spray device 16 is arranged at the water outlet, and is used to spray condensed water or waste hot water into the indirect evaporative cooler 6 to exchange heat with the evaporative cooler 6; the first valve 17 , is arranged between the first water inlet 15 and the water outlet; the 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 for Drive the flow of waste water.

In order to store condensed water so as to be sprayed from the spraying device, as shown in FIG. To store condensed water, the liquid level sensor 21 is arranged in the water collector 31 for detecting the liquid level height in the water collector 31; the drain pipe 22 is communicated with the indirect evaporative cooler 6 and is used to connect the indirect evaporative cooler 6 Drain the water inside. A third valve 23 is also provided on the drain pipe 22 for controlling whether the water in the drain pipe 22 is discharged. In order to realize spraying by using the gravity of the condensed water itself and save power, the vertical height of the first water inlet 15 is higher than that of the spraying device 16 .

In order to realize whether the fresh air flows through the surface cooler 2, as shown in FIG. The cooler 2 or the second air valve 24 are alternatively discharged.

In order to control the flow of fresh air into the first passage 51 or the second passage 52, the first passage 51 is also provided with: a third damper 25 at the entrance of the first passage 51; a fourth damper 26 at the outlet of the first passage 51 , the fifth damper 27 is located at the entrance of the second channel 52 .

In order to ensure the quality of fresh air, as shown in Figure 1, the above-mentioned heat exchange device also includes: a primary filter 28, arranged between the fan 11 and the air inlet 9, and an intermediate filter 29, arranged between the vertical passage 30 and the surface Between cooler 2.

In order to avoid overflow of condensed water, the above-mentioned heat exchange device further includes a first water receiving pan 32 arranged at the bottom of the surface cooler 2 ; a second water receiving tray 33 is arranged at the bottom of the indirect evaporative cooler 6 .

Example 2

This embodiment provides an air conditioner, including the heat exchange device in the above embodiment.

Example 3

This embodiment provides a control method using the heat exchange device in the above embodiment. FIG. 4 is a flow chart of the control method according to the embodiment of the present invention. As shown in FIG. 4, the control method includes:

S101. Determine a heat exchange mode of the heat exchange device; wherein, the heat exchange mode includes a cooling mode and a heating mode.

S102. If the heat exchange mode is cooling mode, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in cooling according to the temperature of fresh air introduced from the lower housing.

S103, if the heat exchange mode is the heating mode, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in heating according to the temperature of fresh air introduced from the lower housing.

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

In order to accurately control the cooling capacity according to the outdoor temperature in the cooling mode, control whether the indirect evaporative cooler in the lower housing and the surface cooler in the upper housing participate in cooling according to the fresh air temperature introduced by the lower housing, including: if the lower housing If the temperature of the fresh air introduced by the shell is greater than the first temperature threshold, control the indirect evaporative cooler and the surface cooler to participate in cooling; if the temperature of the fresh air introduced by the lower shell is less than or equal to the first temperature threshold, and is greater than the second temperature threshold, then control the surface cooler to participate in cooling, and the indirect evaporative cooler does not participate in cooling; if the temperature of the fresh air introduced by the lower shell is less than or equal to the second temperature threshold, then control the Neither the indirect evaporative cooler nor the surface cooler participates in refrigeration. Wherein, the above-mentioned first temperature threshold is greater than the temperature threshold, and both the first temperature threshold and the second temperature threshold can be measured through experiments.

Specifically, controlling both the indirect evaporative cooler and the surface cooler to participate in refrigeration includes: controlling the opening of the first damper 14, the third damper 25, the fifth damper 27 and the third valve 23, controlling the second damper 24 and The fourth air valve 26, the first valve 17, and the second valve 19 are closed, and the indirect evaporative cooler 6 and the surface cooler 2 are controlled to operate in cooling; the surface cooler is controlled to participate in cooling, and the indirect evaporative cooler is not Cooling, including: controlling the opening of the third damper 25 and the fourth damper 26, controlling the first damper 14, the second damper 24, the fifth damper 27, the first valve 17, and the second valve 19 And the third valve 23 is closed, and the indirect evaporative cooler 6 is controlled to stop running, and the surface cooler 2 is refrigerated; the indirect evaporative cooler and the surface cooler are controlled not to participate in refrigeration, including: controlling the second air valve 24, the third air The valve 25, the fourth air valve 26, and the fifth air valve are 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 All stop running; wherein, the first air valve 14 is set at the entrance of the second fresh air channel, the second air valve 24 is adjacent to the surface cooler, the third air valve 25 is set at the entrance of the first channel 51, and the fourth air valve The valve 26 is arranged at the outlet of the first passage 51, the fifth air valve 27 is arranged at the entrance of the second passage 52, the first valve 17 is arranged between the first water inlet 15 and the spray device 16, and the second valve 19 It is arranged between the second water inlet 18 and the spraying device 16 , and the third valve 23 is arranged on the drain pipe, and the drain pipe communicates with the second channel 52 .

In order to accurately control the heating capacity according to the outdoor temperature in the heating mode, control whether the indirect evaporative cooler in the lower casing and the surface cooler in the upper casing participate in heating according to the fresh air temperature introduced by the lower casing, including : If the fresh air temperature introduced by the lower shell is less than or equal to the third temperature threshold, then control the indirect evaporative cooler and the surface cooler to participate in heating; if the fresh air temperature introduced by the lower shell is greater than the third threshold Three temperature thresholds, the indirect evaporative cooler is controlled to participate in heating, and the surface cooler 2 is controlled not to participate in heating.

Specifically, controlling both the indirect evaporative cooler and the surface cooler to participate in heating includes: controlling the opening of the fifth damper 27, the second valve 19 and the third valve 23, controlling the opening of the first damper 14, the second The air valve 24, the third air valve 25, the fourth air valve 26 and the first valve 17 are closed, and the heating operation of the surface cooler and the indirect evaporative cooler is controlled; the indirect evaporative cooler is controlled to participate in heating, and the surface cooler is not controlled. Participate in heating, including: controlling the opening of the second damper 24, the fifth damper 27, the second valve 19 and the third valve 23, controlling the first damper 14, the third damper 25, the fourth damper 26 and the third damper A valve 17 is closed, and the surface cooler 2 is controlled to stop running, and the indirect evaporative cooler 6 is heated. The above-mentioned third temperature threshold is lower than the second temperature threshold, and the specific value of the third temperature threshold can be measured through experiments in the heating mode.

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

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

(a)T>t1

In extremely hot summer, the indoor fresh air temperature requirements are relatively high, and the primary cooling often fails to meet the indoor temperature requirements. The combination of the indirect evaporative cooler 6 and the surface cooler 2 is used 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 damper 14, the third damper 25, the fifth damper 27, and the third damper 23 are controlled to open, and the second damper 24, the fourth damper 26, the first damper 17 and the second damper 24 are controlled. The second valve 19 is closed, and controls both the indirect evaporative cooler 6 and the surface cooler 2 to operate in refrigeration. 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 Always open, when the condensed water of the device is insufficient, the first valve 17 is opened when the condensed water in the water collector 31 is lower than the set liquid level h1, and the condensed water of other surface coolers is connected externally.

As shown in FIG. 1 , the outdoor fresh air enters the unit from the air inlet 9 of the fresh air, and passes through the primary filter 28 to filter large particle pollutants in the air. The fan 11 sends the fresh air into the first channel 51 and the second channel 52 respectively, and the air in the first channel 51 enters the second channel of the indirect evaporative cooler 6 through the first damper 14 and the inlet 12 of the first fresh air channel as working air. Fresh air channel: The air in the second channel 52 is used as the first fresh air channel that enters the indirect evaporative cooler 6 from the indoor fresh air inlet 4 . In the indirect evaporative cooler 6, the working air and 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, so as to achieve the effect of isohumidity cooling for the use air. The use air is cooled by the indirect evaporative cooler 6 and enters the intermediate filter 29 through the vertical channel 30 to be filtered, then enters the surface cooler 2 for secondary cooling, and finally enters the room through the fresh air outlet 3 after reaching the indoor required temperature. 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 of other terminal devices can be passed through the external first water inlet 15. As a supplement, 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 it is discharged from the drain pipe 22 .

(b)t2<T≤t1

When the fresh air temperature in summer 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 open, and the first air valve 14 and the second air valve 14 are controlled to open. The air valve 24, the fifth air valve 27, the first valve 17, the second valve 19 and the third valve 23 are closed, and the indirect evaporative cooler 6 is controlled to stop running, and the surface cooler 2 is refrigerated.

As shown in Figure 1, the 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. It is sent into the room by 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 to be transported is reduced, the frequency of the fan is reduced, and the energy consumption is reduced.

(c)T≤t2

In the transition season, the temperature of outdoor fresh air is often low, and it can meet the indoor load demand without cooling treatment. 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 open, and the first air valve 14, the first valve 17, and the second air valve are controlled. 19 and the third valve 23 are closed, and both the surface cooler 2 and the indirect evaporative cooler 6 are controlled to stop running.

As shown in Figure 1, the outdoor fresh air is sent into the first channel 51 and the second channel 52 by the blower fan 11, and finally sent into the room by the fresh air outlet 3 after entering the vertical channel 30. At this time, there is no condensed water passing through the surface cooler 2, and 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 running time of the host and reduces the operating cost of the air conditioning system.

During heating in winter, it is divided into two working modes (T≤t3, T>t3) according to the parameter of the fresh air temperature T. The user can reasonably set the value of t3 according to the actual situation. The specific working process is as follows:

(d)T≤t3

The room can be provided with hot air by combining the indirect evaporative cooler 6 and the surface cooler. Control the fifth air valve 27, the second valve 19 and the third valve 23 to open, control 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 Control the heating operation of the surface cooler 2 and the indirect evaporative cooler 6 .

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

(e)T>t3

At this time, the surface cooler can not be used for heating, and the second air valve 24, the fifth air valve 27, the second valve 19 and the third valve 23 are controlled to open, and the first air valve 14, the third air valve 25, and the fourth air valve are controlled. 26 and the first valve 17 are closed, and the surface cooler 2 is controlled to stop running, and the indirect evaporative cooler 6 is heated. The fresh air is sent into the second channel 52 by the fan 11, exchanges heat with the filtered waste hot water in the external water pipe in the indirect evaporative cooler 6, and after bearing part of the indoor load, passes through the second damper 24, and finally The heated air enters the room through the fresh air outlet 3. The waste hot water is delivered to the spraying device 16 by the water pump 28 and discharged from the drain pipe 22 .

Example 4

This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the control method of the above-mentioned embodiment is implemented.

Through the above description of the implementations, those skilled in the art can clearly understand that each implementation can be implemented by means of software plus a necessary general hardware platform, and of course also by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic discs, optical discs, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments.

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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (16)

1. A heat exchange device, comprising:

the shell comprises an upper shell and a lower shell which are communicated with 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;

the surface cooler is arranged in the upper shell;

the indirect evaporative cooler is arranged in the lower shell and comprises 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, the lower shell also comprises a first channel, the inlet of the first channel is communicated with the air inlet, and the outlet of the first channel is communicated with the upper shell.

2. The heat exchange device of claim 1, further comprising:

and the temperature sensor is arranged at the air inlet and used for detecting the temperature of fresh air introduced by the air inlet.

3. The heat exchange device of claim 1, further comprising:

and the fan is arranged in the lower-layer shell and close to one side of the air inlet and is used for introducing fresh air into the first channel and/or the second channel.

4. The heat exchange device of claim 1, wherein the inlet of the second fresh air channel is communicated with the first channel, and the outlet of the second fresh air channel is the air outlet.

5. The heat exchange device of claim 4, further comprising in the second channel:

and the first air valve is arranged at the inlet of the second fresh air channel.

6. The heat exchange device of claim 1,

the heat exchange device further comprises: a water intake structure comprising a first water inlet, a second water inlet and a water outlet, the first water inlet being in communication with a condensation line, the second water inlet being in communication with a waste hot water line, the water outlet being in communication with a water inlet of the indirect evaporative cooler; the first water inlet is higher than the water outlet;

the spraying device is arranged at the water outlet and is used for spraying the condensed water or the waste hot water into the indirect evaporative cooler to exchange heat with the evaporative cooler;

a first valve disposed between the first inlet and the outlet;

and the second valve is arranged between the second water inlet and the water outlet.

7. The heat exchange device of claim 6, further comprising:

a water collector disposed between the first water inlet and the spray device,

the liquid level sensor is arranged in the water collector and used for detecting the liquid level height in the water collector;

the water discharge pipe is communicated with the indirect evaporative cooler and is used for discharging condensed water after heat exchange;

and the third valve is arranged on the water drainage pipe.

8. The heat exchange device of claim 1, wherein the upper shell further comprises:

and the second air valve is arranged adjacent to the surface cooler and used for controlling the fresh air to be discharged by the surface cooler or alternatively by the second air valve.

9. The heat exchange device of claim 1, wherein the first channel further comprises:

a third damper located at an inlet of the first passage;

a fourth air valve positioned at an outlet of the first channel;

and the fifth air valve is positioned at the inlet of the second channel.

10. An air conditioner characterized by comprising the heat exchange device of any one of claims 1 to 9.

11. A control method applied to the heat exchange device of any one of claims 1 to 9, characterized in that the control method comprises:

determining a heat exchange mode of the heat exchange device; wherein the heat exchange mode comprises a refrigeration mode and a heating mode;

if the heat exchange mode is a refrigeration mode, controlling whether an indirect evaporative cooler in the lower shell and a surface cooler in the upper shell participate in refrigeration or not according to the temperature of fresh air introduced by the lower shell;

and if the heat exchange mode is a heating mode, controlling whether the indirect evaporative cooler in the lower shell and the surface cooler in the upper shell participate in heating or not according to the temperature of fresh air introduced by the lower shell.

12. The control method of claim 11, wherein controlling whether the indirect evaporative cooler in the lower shell and the surface air cooler in the upper shell participate in cooling according to the temperature of the fresh air introduced by the lower shell comprises:

if the temperature of the fresh air introduced by the lower shell is greater than a first temperature threshold value, controlling the indirect evaporative cooler and the surface air cooler to participate in refrigeration;

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 a second temperature threshold, controlling the surface air cooler to participate in refrigeration, and controlling the indirect evaporative cooler not to participate in refrigeration;

and if the temperature of the fresh air introduced by the lower shell is less than or equal to the second temperature threshold value, controlling the indirect evaporative cooler and the surface air cooler not to participate in refrigeration.

13. The control method according to claim 12,

control indirect evaporative cooler with the surface cooler all participates in the refrigeration, include: 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, the fourth air valve, the first valve and the second valve to be closed, and controlling the indirect evaporative cooler and the surface air cooler to perform refrigeration operation;

control the surface cooler participates in the refrigeration, indirect evaporative cooler does not participate in the refrigeration, includes: controlling the third air valve and the fourth air valve to be opened, controlling the first air valve, the second air valve, the fifth air valve, the first valve, the second valve and the third air valve to be closed, and controlling the indirect evaporative cooler to stop running and the surface air cooler to refrigerate;

control indirect evaporative cooler with the surface cooler does not all participate in the refrigeration, includes: controlling the second air valve, the third air valve, the fourth air valve and the fifth air valve to be opened, controlling the first air valve, the first valve, the second valve and the third valve to be closed, and controlling the surface cooler and the indirect evaporative cooler to stop running;

the first air valve is arranged at an inlet of a second fresh air channel, the second air valve and the surface air cooler are arranged adjacently, the third air valve is arranged at the inlet of the first channel, the fourth air valve is arranged at an outlet of the first channel, the fifth air valve is arranged at the inlet of the second channel, the first valve is arranged between a first water inlet and a water outlet of the water inlet mechanism, the second valve is arranged between a second water inlet and the water outlet of the water inlet mechanism, the third valve is arranged on a drain pipe, and the drain pipe is communicated with the second channel.

14. The control method according to claim 11, wherein 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 fresh air introduced by the lower shell comprises:

if the temperature of the fresh air introduced by the lower shell is less than or equal to a third temperature threshold value, controlling the indirect evaporative cooler and the surface cooler to participate in heating;

and if the temperature of the fresh air introduced by the lower shell is greater than a third temperature threshold value, controlling the indirect evaporative cooler to participate in heating, and controlling the surface air cooler not to participate in heating.

15. The control method according to claim 14,

control indirect evaporative cooler with the surface cooler all participates in heating, include: controlling the fifth air valve, the second air valve and the third valve to be opened, controlling the first air valve, the second air valve, the third air valve, the fourth air valve and the first valve to be closed, and controlling the air cooler and the indirect evaporative cooler to perform heating operation;

control indirect evaporative cooler participates in heating, controls the surface cooler does not participate in heating, includes: and controlling the second air valve, the fifth air valve, the second valve and the third valve to be opened, controlling the first air valve, the third air valve, the fourth air valve and the first valve to be closed, controlling the surface air cooler to stop running, and controlling the indirect evaporative cooler to heat and run.

16. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 11 to 15.

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