An antifreeze type indirect evaporative cooling air conditioning unit

Abstract

The present invention relates to an antifreeze type indirect evaporative cooling air conditioning unit, comprising a first heat exchange core, an evaporative cooling system, a water tank, an outdoor wind channel, and an indoor wind channel. The outdoor wind channel, the indoor wind channel, the first heat exchange core, and the evaporative cooling system are all arranged inside the unit shell. The outdoor wind channel flows through the outdoor air channel of the first heat exchange core, and the indoor wind channel flows through the indoor air channel of the first heat exchange core. The evaporative cooling system takes water from the water tank and uses it to spray the first heat exchange core. The water tank is arranged inside the unit shell and is located at the position where the outdoor wind channel is heated by the first heat exchange core. By arranging the water tank inside the unit, the outdoor wind rises in temperature after heat exchange with the heat exchange core and then contacts the water tank, which is beneficial to the antifreeze of the water tank. At the same time, the water in the water tank is prevented from directly contacting with the outside wind and sunlight, which is beneficial to inhibiting the growth of microorganisms and preventing the growth of algae in the water tank from blocking the evaporative cooling system.

Description

Technical Field

[0001] The invention relates to the field of air conditioning, and in particular to an antifreeze type indirect evaporative cooling air conditioning unit. Background Art

[0002] As shown in patent documents CN201822222249.3 and CN201821974088.7, the indirect evaporative air conditioning system used in data centers generally includes a water spray system, an inner wind system, an outer wind system, a heat exchange core for heat exchange between the inner wind and the outer wind, and an auxiliary cooling system. And there are three main operating modes: dry mode, wet mode, and a mixed mode of wet mode + mechanical refrigeration (or other cooling methods such as chilled water coil cooling). When the application environment temperature is low, the dry mode is operated, the water spray system outside the unit is not turned on, and the air outside the unit and the air inside the unit are cooled through sensible heat exchange of the heat exchange core; when the application environment is mild, the wet mode is operated, at this time the unit spray system is turned on, the water evaporates to cool the outdoor air, and then heat is exchanged through the heat exchange core to reduce the indoor air temperature; when the outdoor ambient temperature dry bulb temperature is high and the wet bulb temperature is also high, the spray system and the auxiliary cooling system are turned on at the same time, and the unit operates in a mixed mode.

[0003] Since water spraying is required, a water tank needs to be set up. In the existing technical solution, the water tank is in direct contact with the outdoor air. When the ambient temperature is low, freezing may occur. To solve this problem, the solution adopted in the prior art is as shown in patent document CN201910626222.7, which is to completely discharge the water in the water tank when the outdoor ambient temperature is lower than a certain temperature. However, this treatment solution will cause waste of water resources. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of freezing of the water tank of the unit without draining the water in the water tank.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] An antifreeze type indirect evaporative cooling air conditioning unit comprises a first heat exchange core, an evaporative cooling system, a water tank, an outdoor wind duct for conveying cold air, and an indoor wind duct for conveying hot air. The outdoor wind duct, the indoor wind duct, the first heat exchange core, and the evaporative cooling system are all arranged inside the unit shell. The outdoor wind duct flows through the outdoor air channel of the first heat exchange core, and the indoor wind duct flows through the indoor air channel of the first heat exchange core. The evaporative cooling system takes water from the water tank and uses it to spray the first heat exchange core. The water tank is arranged inside the unit shell and is located at the position of the outdoor wind duct after heat exchange by the first heat exchange core.

[0007] As an implementation method, in order to implement secondary cooling and enhance the cooling effect, a second heat exchange core is also provided inside the unit shell, wherein the first heat exchange core and the second heat exchange core are both air-to-air heat exchangers, and the outdoor air flow channel flows through the outdoor air channels of the first heat exchange core and the second heat exchange core in sequence, and the indoor air flow channel flows through the indoor air channels of the first heat exchange core and the second heat exchange core in sequence.

[0008] In order to cool the outdoor wind by evaporating water in the water tank and absorbing heat before the outdoor wind enters the second heat exchange core, thereby further enhancing the cooling effect, the water tank is located in the outdoor wind flow channel between the first heat exchange core and the second heat exchange core.

[0009] As an implementation method, in order to utilize the characteristics of cold air to make it sink naturally, reduce the required wind force, and reduce the power consumption of the whole machine, the outdoor air flow duct from the outdoor air inlet to the part connected to the first heat exchange core is located above the first heat exchange core, and the part of the outdoor air flow duct located between the first heat exchange core and the second heat exchange core is located below the first heat exchange core.

[0010] Furthermore, in order to lower the center of gravity, the water tank is located at the bottom of the unit.

[0011] Furthermore, in order to achieve a compact structure and reduce the size of the entire machine, the indoor air outlet of the first heat exchange core is directly connected to the indoor air inlet of the second heat exchange core, and both are located in the middle of the unit. The indoor air flow duct passes through the first heat exchange core and the second heat exchange core and directly penetrates the middle of the unit. The outdoor air flow duct from the outdoor air outlet to the part connected to the second heat exchange core is located above the second heat exchange core, and a circulating fan is provided in this part to deliver air toward the outdoor air outlet.

[0012] As an implementation mode, the evaporative cooling system is specifically a water spray system, whose nozzle is located above the first heat exchange core and the second heat exchange core and sprays downwardly to the first heat exchange core and the second heat exchange core, so that water vapor can fully flow through the heat exchange core under gravity to enhance the heat exchange effect, and the unevaporated water vapor naturally flows back to the water tank to achieve reuse.

[0013] Furthermore, a water baffle is provided in the outdoor wind duct from the outdoor air outlet to the portion connected to the second heat exchange core. The water baffle is located above the nozzle of the evaporative cooling system to prevent the outdoor wind circulation from bringing water vapor out of the unit, thereby improving water utilization.

[0014] As an embodiment, the outdoor wind duct is provided with a filter covering its outdoor entrance and exit to filter outdoor air particles and reduce pollution to the spray water quality; and / or the indoor wind duct is provided with a filter covering its indoor entrance and exit to filter indoor air dust and clean the indoor air.

[0015] The present invention arranges the water tank inside the unit. The outdoor wind rises in temperature after heat exchange with the heat exchange core and then contacts the water tank, which is beneficial to antifreezing of the water tank. At the same time, it also avoids direct contact between the water in the water tank and the outside wind, which is beneficial to inhibiting the growth of microorganisms and preventing the growth of algae in the water tank from clogging the evaporative cooling system, thereby extending the service life of the evaporative cooling system. At the same time, the water in the water tank does not need to be discharged, which can effectively reduce the waste of water resources.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 The schematic diagram of the overall structure of the indirect evaporative cooling air conditioning unit of the present invention is shown;

[0019] Figure 2 The positional relationship among the indoor wind flow passage, the outdoor wind flow passage and the water tank of the unit of the present invention is shown;

[0020] Figure 3 The schematic diagram of the structure of the two-stage spray system of the unit of the present invention is shown;

[0021] Figure 4 The schematic diagram of the structure of the fluorine pump refrigeration system of the unit of the present invention is shown. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0023] The indirect evaporative cooling air conditioning unit of this embodiment is as follows Figure 1 As shown, it is composed of a compressor cooling system, a fluorine pump refrigeration system, a first spray system, a second spray system, a first heat exchange core 16, a second heat exchange core 17, an indoor side air circulation system, and an outdoor side air circulation system.

[0024] The inside of the unit casing is as follows Figure 2 As shown, in order to achieve a compact structure, the interior of the unit is divided into five chambers by partitions, namely, an outer air inlet chamber A1, an outer air outlet chamber A2, an inner air inlet chamber B1, an inner air outlet chamber B2, and a water tank accommodating chamber C. The outer air inlet chamber A1 and the outer air outlet chamber A2 are distributed in the upper left and right sides of the unit to facilitate the sinking of cold air; the inner air inlet chamber B1 and the inner air outlet chamber B2 are distributed in the middle of the left and right sides of the unit to facilitate heat exchange during the sinking of cold air; the water tank accommodating chamber C is placed at the bottom of the unit to accommodate a water tank, and the water tank is used to lower the center of gravity of the whole machine to stabilize the whole machine.

[0025] The first heat exchange core 16 and the second heat exchange core 17 are air-to-air heat exchangers. The outdoor air inlet of the first heat exchange core 16 is connected to the outer air inlet chamber A1, the outdoor air outlet is connected to the water tank accommodating chamber C, the indoor air inlet is connected to the inner air inlet chamber B1, and the indoor air outlet is connected to the indoor air inlet of the second heat exchange core 17; the outdoor air inlet of the second heat exchange core 17 is connected to the water tank accommodating chamber C, the outdoor air outlet is connected to the outer air outlet chamber A2, the indoor air inlet is connected to the indoor air outlet of the first heat exchange core 16, and the indoor air outlet is connected to the inner air outlet chamber B2.

[0026] An outdoor air inlet 5 is opened on the side wall of the outer air inlet chamber A1, an outdoor air outlet 23 is opened on the side wall of the outer air outlet chamber A2, and a circulating fan 24 is arranged in the outer air outlet chamber A2 to supply air toward the outdoor air outlet 23. The outdoor air inlet 5, the outer air inlet chamber A1, the outdoor air passage of the first heat exchange core 16, the water tank accommodating chamber C, the outdoor air passage of the second heat exchange core 17, the outer air outlet chamber A2, the circulating fan 24, and the outdoor air outlet 23 constitute the outdoor air circulation system for implementing outdoor air circulation.

[0027] Similarly, an indoor air inlet 13 for connecting to the indoor part of the data center is opened on the side wall of the inner air inlet chamber B1, an indoor air outlet 20 is opened on the side wall of the inner air outlet chamber B2, and a circulating fan 21 is arranged in the inner air outlet chamber B2 to supply air toward the indoor air outlet 20. The indoor air inlet 13, the inner air inlet chamber B1, the indoor air passage of the heat exchange core 16 and 17, the inner air outlet chamber B2, the circulating fan 21, and the indoor air outlet 20 constitute the indoor air circulation system for implementing indoor air circulation.

[0028] Further, see Figure 1 A filter 12 covering the indoor air inlet 13 is provided in the inner air inlet chamber B1 to filter indoor air dust and clean the indoor air.

[0029] See Figure 2When in use, the outdoor wind enters the unit and sinks naturally. During the sinking process, it first exchanges heat with the first heat exchange core 16 and then rises in temperature. Then it enters the water tank accommodating chamber C and contacts the water tank 15, which is beneficial to the antifreeze of the water tank 15. At the same time, since the water tank 15 is placed inside the unit, the water in the water tank 15 can be prevented from directly contacting the external wind, which is beneficial to inhibiting the growth of microorganisms, preventing the growth of algae in the water tank from clogging the spray system, and extending the service life of the spray system.

[0030] The outdoor wind in the water tank accommodating chamber C is cooled by the evaporation of water in the water tank 15 and then drawn out of the unit by the circulating fan 24. During the flow, it exchanges heat with the second heat exchange core 17. At this time, the indoor wind is cooled for the second time. Since the outdoor wind temperature is lower, the secondary cooling effect is obvious.

[0031] See Figure 3 As a preferred implementation scheme, a spray system is set up to improve the cooling effect. In order to increase the wet mode operation range of the unit and improve the heat exchange efficiency of the unit compared with the existing one, the spray system is divided into two sets. The first spray system includes a water pump 14 and a water distributor 7, and the second spray system includes a water pump 18 and a water distributor 4. The water pump 14 and the water pump 18 share the same water tank 15.

[0032] The water distributor 7 and the water distributor 4 are both composed of a spray rod and a nozzle connected to the spray rod, and are connected to the corresponding water pump through their own pipelines, and the water pump transports water to the water distributor. The water distributor 7 is placed in the outer air inlet chamber A1 and is located directly above the first heat exchange core 16, and the water distributor 4 is placed in the outer air outlet chamber A2 and is located directly above the second heat exchange core 17. Both of them evenly spray water to the heat exchange core through the nozzle, so as to evaporate and cool the heat exchange core and strengthen the heat exchange. The water that has not evaporated completely flows into the water tank under the action of gravity, and the cycle is repeated.

[0033] In order to realize the intelligent control of the two spray systems, a first temperature sensor 25 is provided at the outdoor air inlet of the first heat exchange core 16, and a second temperature sensor 26 is provided at the outdoor air inlet of the second heat exchange core 17. The first temperature sensor 25, the second temperature sensor 26, the water pump 14, and the water pump 18 are electrically connected to the controller respectively, then:

[0034] When the first temperature sensor 25 detects that the ambient temperature is high (e.g., greater than 15°C), the first spray system and the second spray system are turned on at the same time, and the outdoor side wind is cooled by evaporation of the spray water and then passes through the heat exchange cores 16 and 17 to exchange heat with the indoor side wind, thereby cooling the indoor side wind;

[0035] When the first temperature sensor 25 detects that the ambient temperature is low (such as less than 2°C), the outdoor wind may freeze when it comes into direct contact with the water. Therefore, the controller stops the water pump 14 and shuts down the first spray system for protection. At this time, the low-temperature air outside exchanges heat with the high-temperature air inside the room through the first heat exchange core 16, and flows to the second temperature sensor 26 after being heated. If the second temperature sensor 26 detects that the dry-bulb temperature of the air before entering the second heat exchange core 17 is greater than the set value T1 (such as 15°C), the second spray system is turned on to cool the outdoor wind, so as to further cool the indoor wind through the second heat exchange core 17.

[0036] By setting up two spray systems and controlling them separately, the risks of freezing of water tanks, water pumps, and water pipes can be effectively avoided. At the same time, the lower limit of the temperature range for wet operating conditions can be increased (for example, originally when the outdoor wind speed was 2°C, the spraying could not be turned on to further cool down in order to prevent freezing, but now the spraying can be achieved after heating the heat exchange core), thus improving the unit's energy efficiency throughout the year.

[0037] It should be noted that in this embodiment, the concept of separately setting up two sets of spray systems and controlling them separately is not limited to application in Figure 2 The specific air flow passage shown can also be used for existing general-purpose indirect evaporative cooling air conditioning units. When applied to other general-purpose indirect evaporative cooling air conditioning units, it is only necessary to refer to the embodiment, set one set of spray system nozzles to be placed in the outdoor air flow passage before heat exchange to spray the heat exchange core, and the other set of spray system nozzles to be placed in the outdoor air flow passage after heat exchange to spray the heat exchange core, and then refer to the above spray system control method to implement control, and the purpose of increasing the lower limit of the temperature range of wet working condition operation can be achieved.

[0038] It should also be noted that in this embodiment, the spray system can be replaced by other evaporative cooling systems, such as a spray system, to achieve the same effect.

[0039] Further, see Figure 1 A filter 8 and a water baffle 3 are also provided in the outdoor air circulation system. The filter 8 is placed in the outer air inlet chamber A1 and covers the outdoor air inlet 5 to filter outdoor air particles and reduce the pollution to the spray water quality; the water baffle 3 is placed in the outer air outlet chamber A2 and covers the outdoor air outlet of the second heat exchange core 17 to prevent the outdoor air circulation from bringing water vapor out of the unit when the spray is started, thereby improving the water utilization rate.

[0040] As another preferred embodiment, in order to avoid excessive condensation or ice formation inside the heat exchange core when the ambient temperature is low, and to improve the low-temperature refrigeration efficiency of the unit, the fluorine pump technology is combined with the indirect evaporative cooling technology in this embodiment. Specifically, see Figure 4A condenser 6 covering the outdoor air inlet 5 is arranged in the outer air inlet chamber A1, and an evaporator 11 covering the indoor air inlet of the first heat exchange core 16 is arranged in the inner air inlet chamber B1. The condenser 6, the fluorine circulation pump 9, the flow control component 10, and the evaporator 11 are connected in sequence through copper pipes to form a loop, thereby constituting the fluorine pump refrigeration system.

[0041] In the above description, the flow control component 10 is an electronic expansion valve. If the height difference between the evaporator 11 and the condenser 6 is large enough (greater than 5 m), a heat pipe refrigeration system without a fluorine pump can be used.

[0042] The fluorine circulation pump 9 and the flow control component 10 are electrically connected to the controller respectively. Similarly, the first temperature sensor 25 is used to implement the following fluorine pump control method:

[0043] When the first temperature sensor 25 detects that the outdoor ambient temperature is extremely low (such as less than -20°C), the fluorine pump refrigeration system is turned on by controlling the fluorine circulation pump 9. The refrigerant in the fluorine pump system absorbs the heat of the indoor wind in the evaporator 11 and evaporates into a gaseous state. Then, it enters the condenser 6 to condense and release heat into a liquid state, thereby heating the outdoor wind entering the unit to increase its temperature. Thereafter, the liquid refrigerant is frequency-controlled by the fluorine circulation pump 9, and then throttled by the flow control component 10 before returning to the evaporator 11. During the process, the flow of liquid refrigerant entering the evaporator 11 is controlled by frequency conversion and throttling of the fluorine circulation pump 9 and the flow control component 10, thereby controlling the evaporation heat exchange and reducing the risk of excessive condensation or freezing of the indoor air that has passed through the heat exchange core due to the low outdoor temperature.

[0044] In addition, the controller can be electrically connected to the circulating fan 24, and the speed of the circulating fan 24 can be reduced to reduce the outdoor wind volume, thereby controlling the temperature rise of the outdoor wind. It should be noted that the temperature of the heated outdoor wind is still lower than that of the indoor wind before entering the first heat exchange core 16, so that the indoor wind can be cooled by the first heat exchange core 16.

[0045] This embodiment uses a fluorine pump refrigeration system. At extremely low temperatures, the evaporator 11 absorbs heat from the indoor side wind, and the heat is transferred to the condenser 6 to heat the outdoor side wind, thereby solving the problem of condensation or icing on the inside of the heat exchange core. The cleverness of this embodiment lies in that the heat is taken from the indoor side wind that needs to be cooled, so that the indoor side wind has been cooled once before passing through the heat exchange core, thereby improving the refrigeration efficiency at low temperatures, and the heat is used for the outdoor side wind that needs to be heated at extremely low temperatures, thereby solving the problem of condensation or icing on the inside of the heat exchange core. While protecting the heat exchange core, it also improves the refrigeration capacity and operating efficiency of the unit and achieves high energy utilization.

[0046] Similarly, in this embodiment, the concept of the fluorine pump refrigeration system is not limited to application in Figure 2The specific air flow channel shown can also be used for existing general-purpose indirect evaporative cooling air conditioning units. When applied to other general-purpose indirect evaporative cooling air conditioning units, it is only necessary to refer to the embodiment, set the condenser 6 at the outdoor air inlet, set the evaporator 11 at the indoor air inlet, and connect the two through the fluorine circulation pump 9 and the flow control component 10 to form a loop. Similarly, by referring to the above control method, the purpose of protecting the heat exchange core and improving the refrigeration capacity and operation efficiency of the unit can be achieved.

[0047] Further, see Figure 1 The condenser 6 should be placed on the side of the filter 8 away from the outdoor air inlet 5, and the evaporator 11 should be placed on the side of the filter 12 away from the indoor air inlet 13 to achieve protection.

[0048] It should be noted that when the above-mentioned fluorine pump refrigeration system and two-stage spray system are set up at the same time, the following composite control method can be adopted:

[0049] After the fluorine pump refrigeration system is turned on, if the first temperature sensor 25 detects that the dry bulb temperature of the outdoor wind before passing through the first heat exchange core 16 is greater than the set value T1 (15°C), the first spray system and the second spray system are turned on at the same time;

[0050] If it is detected that the air dry bulb temperature before the outdoor wind passes through the first heat exchange core 16 is less than the set value T2 (2°C), and the air dry bulb temperature before the outdoor wind passes through the second heat exchange core 17 is greater than the set value T1 (15°C), the first spray system is closed and the second spray system is opened;

[0051] If it is detected that the dry-bulb temperature of the air before the outdoor wind passes through the first heat exchange core 16 is less than the set value T2 (2°C) and the dry-bulb temperature of the air before the outdoor wind passes through the second heat exchange core 17 is less than the set value T2 (2°C), the first spray system and the second spray system are closed at the same time.

[0052] In addition, a compressor supplementary cooling system can be set up, see Figure 1 The compressor cooling supplement system includes a condenser 1 arranged in the outer air outlet chamber A2, an evaporator 22 arranged in the inner air outlet chamber B2, a compressor 19, and a throttle valve 2. The condenser 1, the throttle valve 2, the compressor 19, and the evaporator 22 are connected in sequence through copper pipes to form a compressor cooling supplement system.

[0053] The compressor 19 and the throttle valve 2 are electrically connected to the controller respectively, and the first temperature sensor 25 and the second temperature sensor 26 are used to realize supplementary cooling. Specifically, when the first temperature sensor 25 detects that the dry-bulb temperature and the wet-bulb temperature of the outdoor environment are both high, the first spray system and the second spray system are controlled to be turned on at the same time. Thereafter, if the second temperature sensor 26 detects that the indoor air temperature is still not effectively reduced (such as exceeding 35°C), the compressor supplementary cooling system is turned on.

[0054] The indirect evaporative cooling air conditioning unit of this embodiment has the following advantages as a whole:

[0055] 1. It can effectively solve the problems of condensation and ice formation inside the heat exchange core of the unit and antifreeze of the water system under extremely low temperature:

[0056] At extremely low temperatures, the unit's fluorine pump refrigeration system is turned on, and the refrigerant evaporates from the indoor evaporator 11 to absorb heat, and then transfers to the outdoor side to condense and release heat to heat the outside air. This can prevent the outside air that is too low from directly exchanging heat through the first heat exchange core 16, causing condensation or ice on the inside of the first heat exchange core 16. At the same time, the outside air heated by the condenser 6 of the fluorine pump refrigeration system passes through the first heat exchange core 16 for heat exchange with the inside air, and is heated again, and then contacts the water system. This can prevent the water system from freezing and causing problems such as freezing and cracking of components such as water pumps, water pipes, and water tanks.

[0057] 2. It can improve the refrigeration capacity and operating efficiency of the unit at extremely low temperatures:

[0058] The fluorine pump refrigeration technology used is itself an efficient and energy-saving refrigeration system that uses natural cold sources. Its refrigeration efficiency is extremely high at low temperatures. Therefore, turning on the fluorine pump refrigeration at low temperatures can improve the unit's refrigeration capacity and operating efficiency, saving energy;

[0059] 3. The two-stage spray system can back up each other and improve the operating range of wet conditions:

[0060] By adopting a two-stage spraying method, when the outdoor temperature is high and one of the spraying systems fails, the other spraying system can be opened normally, thereby ensuring that the unit's refrigeration capacity does not drop too much when one of the spraying systems fails. At the same time, at low temperatures, the outdoor low-temperature air exchanges heat with the indoor high-temperature air through the first heat exchange core 16, and the outdoor air temperature rises. The air before entering the second heat exchange core 17 is already relatively high-temperature air. At this time, the second spraying system is opened, further improving the operating range of wet conditions and the unit's operating efficiency.

[0061] 4. The water tank is always in a relatively high temperature environment, which can effectively solve the problem of water tank freezing. There is no need to drain the water to reduce water waste:

[0062] After the outdoor air exchanges heat with the indoor air through the first heat exchange core 16, the outdoor air temperature rises, and the water tank is located below the first heat exchange core 16 and is isolated from the low-temperature air outside, ensuring that the water tank is always in a higher temperature environment, avoiding the problem of water system freezing. At the same time, the water in the water system does not need to be discharged, which can effectively reduce the waste of water resources.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An antifreeze type indirect evaporative cooling air conditioning unit, comprising a first heat exchange core, an evaporative cooling system, a water tank, an outdoor air flow channel for conveying cold air, and an indoor air flow channel for conveying hot air, wherein the outdoor air flow channel, the indoor air flow channel, the first heat exchange core, and the evaporative cooling system are all arranged inside the unit shell, the outdoor air flow channel flows through the outdoor air channel of the first heat exchange core, the indoor air flow channel flows through the indoor air channel of the first heat exchange core, the evaporative cooling system takes water from the water tank and uses it to spray the first heat exchange core, characterized in that: The water tank is arranged inside the unit shell and is located at the position after the outdoor wind flow passage has been heat exchanged by the first heat exchange core; A second heat exchange core is also provided inside the unit shell, the outdoor air flow passage flows through the outdoor air passages of the first heat exchange core and the second heat exchange core in sequence, and the indoor air flow passage flows through the indoor air passages of the first heat exchange core and the second heat exchange core in sequence; The water tank is located in the outdoor wind flow passage between the first heat exchange core and the second heat exchange core; The outdoor air flow channel from the outdoor air inlet to the portion connected to the first heat exchange core is located above the first heat exchange core, and the outdoor air flow channel between the first heat exchange core and the second heat exchange core is located below the first heat exchange core; The water tank is located at the bottom of the unit; The indoor air outlet of the first heat exchange core is directly connected to the indoor air inlet of the second heat exchange core, and both are arranged in the middle of the unit, and the indoor side air flow channel passes through the first heat exchange core and the second heat exchange core and directly penetrates the middle of the unit; The nozzle of the evaporative cooling system is located above the first heat exchange core and the second heat exchange core and sprays downwards to the first heat exchange core and the second heat exchange core; A first temperature sensor is arranged at the outdoor air inlet of the first heat exchange core, and a second temperature sensor is arranged at the outdoor air inlet of the second heat exchange core. The first temperature sensor and the second temperature sensor are used to control the nozzle of the evaporative cooling system.

2. An antifreeze type indirect evaporative cooling air conditioning unit as claimed in claim 1, characterized in that: The portion of the outdoor air flow passage from the outdoor air outlet to the portion connected to the second heat exchange core is located above the second heat exchange core, and a circulating fan is provided in the portion to supply air toward the outdoor air outlet.

3. The antifreeze type indirect evaporative cooling air conditioning unit according to claim 1, characterized in that: A water baffle is provided in the outdoor air flow channel from the outdoor air outlet to the portion connected to the second heat exchange core, and the water baffle is located above the nozzle of the evaporative cooling system to block water.

4. An antifreeze type indirect evaporative cooling air conditioning unit as claimed in claim 1 or 2, characterized in that: The outdoor air flow passage is provided with a filter covering its outdoor inlet and outlet; and / or the indoor air flow passage is provided with a filter covering its indoor inlet and outlet.

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