Composite multi-stage evaporation cooling unit

Abstract

The utility model discloses a composite multi-stage evaporation cooling unit which comprises a fresh air pre-cooling section, a first indirect evaporation cooling section, a second indirect evaporation cooling section, a fresh air re-cooling section, a direct evaporation cooling section and an air feeder section. A first indirect evaporative cooling section is arranged on one side of the fresh air pre-cooling section, a second indirect evaporative cooling section is arranged on the other side of the first indirect evaporative cooling section, and a direct evaporative cooling filler is arranged in the fresh air re-cooling section; the fresh air cooled twice is used as supplied air after being recooled by the recooling fin heat exchanger and cooled by direct evaporative cooling, and is supplied to a user under the action of the air feeder; the unit is equivalent to that part of fresh air is subjected to indirect evaporative cooling for four times and direct evaporative cooling for one time, fresh air with the temperature lower than the dew point temperature of the fresh air can be obtained, low-temperature air supply meeting the use requirement can be obtained through direct evaporative cooling and humidity adjustment, the system energy-saving effect is remarkable, and high practicability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of novel energy-saving direct evaporative cooling, in particular to a composite multi-stage evaporative cooling air unit. Background Art

[0002] my country has a vast territory, and the climate varies greatly in different regions. Compared with the hot and humid climate in the coastal areas in summer, the hot and dry areas in the northwest in summer can make full use of direct evaporation technology to provide cold air, but the cold air temperature provided by direct evaporation is often 2 to 5°C higher than the wet-bulb temperature of the incoming air. If a lower air supply temperature is required, it is more difficult. On the other hand, if direct evaporative cooling is used, multiple spraying is required to achieve a lower air supply temperature, and the moisture content in the air supply is high. In some scenarios, such as cooling of tall factories or industrial buildings, high humidity is not conducive to the application scenario.

[0003] At present, the air conditioning technology of evaporative cooling to produce cold air has been widely used in the low-humidity environment of the northwest. In the southeastern coastal areas of my country, due to the high relative humidity of the air and the restrictions of outdoor meteorological conditions, it is not easy to achieve stable working conditions by simply using evaporative cooling, or it is not applicable to occasions with special requirements for air supply temperature and humidity. New technologies are urgently needed to expand the use of natural energy. Utility Model Content

[0004] The purpose of the utility model is to provide a composite multi-stage evaporative cooling air unit to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical solutions: a composite multi-stage evaporative cooling air unit, including a box body, the technical points of which are:

[0006] The box body includes, from left to right, a fresh air pre-cooling section, a first indirect evaporative cooling section, a second indirect evaporative cooling section, a fresh air re-cooling section, a direct evaporative cooling section and a blower section;

[0007] The fresh air precooling section includes an air inlet located on one side of the box body, and a primary filter connected to the air inlet, and one side of the primary filter is connected to a precooling fin heat exchanger;

[0008] A first indirect evaporative cooling section is provided on one side of the fresh air precooling section, a first indirect evaporative air-to-air heat exchanger is provided in the first indirect evaporative cooling section, and a first indirect evaporative spray row, a first indirect evaporative air outlet and a first indirect evaporative fan are sequentially provided above the first indirect evaporative air-to-air heat exchanger;

[0009] A second indirect evaporative cooling section is provided on one side of the first indirect evaporative cooling section, a second indirect evaporative air-to-air heat exchanger is provided in the second indirect evaporative cooling section, and a second indirect evaporative spray row, a second indirect evaporative fan, and a second indirect evaporative exhaust port are sequentially provided above the second indirect evaporative air-to-air heat exchanger;

[0010] A direct evaporative cooling filler is arranged in the fresh air re-cooling section, a direct evaporative spray row is arranged above the direct evaporative cooling filler, and a water baffle is arranged on one side of the direct evaporative cooling filler.

[0011] Preferably, a re-cooling fin heat exchanger is provided in the fresh air re-cooling section, and the re-cooling fin heat exchanger is located on one side of the direct evaporative cooling filler, and a direct evaporative water tank is provided below the direct evaporative cooling filler.

[0012] Preferably, a direct evaporative spray pump is provided in the direct evaporative water tank. After the fresh air passes through the fresh air pre-cooling section, the primary indirect evaporative cooling and the secondary indirect evaporative cooling, it enters the cold water of the re-cooling fin heat exchanger through the direct evaporative spray pipeline connected to the direct evaporative spray pump for heat exchange under the action of the direct evaporative spray pump. After the fresh air is cooled by isohydrophilic acid, it enters the direct evaporative cooling filler.

[0013] Preferably, an indirect evaporative water tank is arranged below the first indirect evaporative cooling section and the second indirect evaporative cooling section, and a precooling circulation pump is arranged in the indirect evaporative water tank. The precooling circulation pump is connected to one end of the precooling fin heat exchanger, and the other end of the precooling fin heat exchanger is connected to the indirect evaporative water tank through a precooling heat exchange pipeline.

[0014] Preferably, an indirect evaporation spray solenoid valve and a drain valve are provided on one side of the indirect evaporation water tank, and the indirect evaporation spray solenoid valve is connected to the first indirect evaporation spray row and the second indirect evaporation spray row through an indirect evaporation spray pipeline.

[0015] Preferably, a water replenishment solenoid valve is provided on one side of the direct evaporation water tank for replenishing water in time according to the water level of the direct evaporation water tank.

[0016] Preferably, the blower section includes a blower and an air outlet; the fresh air that has undergone four indirect heat exchanges and one direct evaporation cooling is delivered to the cooling user from the air outlet under the action of the blower.

[0017] Preferably, the direct evaporative cooling filler is formed by alternately stacking PVC sheets and high-strength anti-corrosion and flame-retardant corrugated cardboard sheets.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the unit uses one box to realize fresh air pre-cooling, two indirect evaporative cooling, re-cooling and direct evaporative humidification cooling. The temperature of the fresh air delivered by the utility model is lower than the dew point temperature of the incoming air and the relative humidity is controllable. Under the condition of the same cooling capacity, the required air supply volume is smaller and can better meet the needs of users. The composite multi-stage cooling evaporative cooling cold air unit of the utility model is simple in system, compact in structure, and has significant energy-saving effect, and is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model.

[0020] In the figure: 1, air inlet, 2, primary filter, 3, pre-cooling fin heat exchanger, 4, first indirect evaporation spray row, 5, first indirect evaporation exhaust port, 6, first indirect evaporation fan, 7, second indirect evaporation exhaust port, 8, second indirect evaporation fan, 9, second indirect evaporation spray row, 10, re-cooling fin heat exchanger, 11, direct evaporation spray row, 12, direct evaporation cooling filler, 13, water baffle, 14, blower, 15, air supply port, 16. Water replenishment solenoid valve, 17. Direct evaporation water tank, 18. Direct evaporation spray pump, 19. Direct evaporation spray pipeline, 20. Second indirect evaporation air-to-air heat exchanger, 21. First indirect evaporation air-to-air heat exchanger, 22. Second indirect evaporation air flow channel, 23. Indirect evaporation spray pipeline, 24. Indirect evaporation spray solenoid valve, 25. Drain valve, 26. Indirect evaporation water tank, 27. Precooling circulation pump, 28. Precooling heat exchange pipeline, 29. Box body. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , the utility model provides a technical solution:

[0023] A composite multi-stage evaporative cooling air unit, characterized in that it includes a fresh air pre-cooling section, a first indirect evaporative cooling section, a second indirect evaporative cooling section, a fresh air re-cooling section, a direct evaporative cooling section and a blower section, and the above-mentioned functional sections are all combined in a box 29.

[0024] The fresh air precooling section includes an air inlet 1, a primary filter 2 and a precooling fin heat exchanger 3. In the precooling section, the fresh air is filtered by the primary filter 2 and enters the precooling fin heat exchanger 3, and exchanges heat with the cold water that enters the precooling fin heat exchanger 3 through the precooling heat exchange pipeline 28 under the action of the precooling circulation pump 27. After the fresh air is cooled by isohydrophilic cooling, it enters the first indirect evaporator.

[0025] The first indirect evaporative cooling section includes the first indirect evaporative spray row 4, the first indirect evaporative exhaust port 5, the first indirect evaporative fan 6, the first indirect evaporative air-to-air heat exchanger 21, the indirect evaporative spray solenoid valve 24, the drain valve 25, the indirect evaporative water tank 26, etc. After the precooled fresh air enters the first indirect evaporative air-to-air heat exchanger 21, it exchanges heat and mass with the cold water sprayed from the indirect evaporative spray pipe 23 in the first indirect evaporative spray row 4. After the cold water evaporates, it takes away the heat of the fresh air to cool the fresh air. The generated water vapor is discharged from the first indirect evaporative exhaust port 5 with part of the fresh air as the working airflow under the action of the first indirect evaporative fan 6. The unevaporated water falls into the indirect evaporative water tank 26, and the indirect evaporative water tank 26 can be regularly drained through the drain valve 25. The indirect evaporative spray pipe 23 is connected to the indirect evaporative spray solenoid valve 24, and the spraying water volume can be controlled by controlling the start time period of the indirect evaporative spray solenoid valve 24.

[0026] The second indirect evaporative cooling section includes a second indirect evaporative spray row 9, a second indirect evaporative exhaust port 7, a second indirect evaporative fan 8, and a second indirect evaporative air-to-air heat exchanger 20. After precooling and cooling in the first indirect evaporator, the fresh air enters the second indirect evaporative air-to-air heat exchanger through the second indirect evaporative airflow channel 22, and exchanges heat and mass with the cold water sprayed from the second indirect evaporative spray row 9 by the indirect evaporative spray pipeline 23. After evaporation, the cold water takes away the heat of the fresh air to cool the fresh air. The generated water vapor is discharged from the second indirect evaporative exhaust port 7 with part of the fresh air as the working airflow under the action of the second indirect evaporative fan 8. The unevaporated water falls into the indirect evaporative water tank 26, and the indirect evaporative water tank 26 can be regularly discharged through the sewage valve 25.

[0027] The fresh air re-cooling section and direct evaporative cooling section include a re-cooling fin heat exchanger 10, a direct evaporative spray pump 18, and a direct evaporative spray pipeline 19. After filtering, pre-cooling, primary indirect evaporative cooling, and secondary indirect evaporative cooling, the fresh air exchanges heat with the cold water that enters the re-cooling fin heat exchanger 10 through the direct evaporative spray pipeline 19 under the action of the direct evaporative spray pump 18. After the fresh air is cooled by isohumidity, it enters the direct evaporative cooling filler 12. The cold water after the fresh air is re-cooled enters the direct evaporative spray row 11 through the direct evaporative spray pipe 19 and is sprayed to the direct evaporative cooling filler 12 for direct evaporative cooling, completing the final humidification and cooling of the fresh air and entering the air supply section. The unevaporated cold water falls into the direct evaporative water tank 17 and participates in the circulation again. The direct evaporative water tank 17 is also provided with a water replenishment solenoid valve 16, which is used to replenish water in time according to the water level of the direct evaporative water tank 17.

[0028] The blower section includes a blower 14 and an air outlet 15. The fresh air, which has undergone four indirect heat exchanges and one direct evaporation cooling, is delivered from the air outlet 15 to a user who uses cooling under the action of the blower 14.

[0029] The direct evaporative cooling filler 12 can be formed by alternately stacking PVC sheets, high-strength anticorrosive and flame-retardant corrugated cardboard sheets, etc. The sheet spacing is designed to be 2.0 mm, 3.0 mm, 4.0 mm, etc. The sheets are alternately stacked to form a cube or a cuboid.

[0030] The working principle of the utility model is:

[0031] Fresh air enters the unit and is first precooled by the precooling fin heat exchanger. A part of the cooled fresh air exchanges heat and mass with the cold water from the first indirect evaporative spray row in the first indirect evaporator. After the cold water evaporates, it takes away the heat of the fresh air to cool the fresh air. The generated water vapor is discharged with part of the fresh air as the working airflow. The remaining part of the fresh air exchanges heat and mass with the cold water from the second indirect evaporative spray row. After the cold water evaporates, it takes away the heat of the fresh air to regenerate and cool the fresh air. The generated water vapor is discharged with part of the fresh air as the working airflow. The fresh air after two coolings is recooled by the recooling fin heat exchanger and directly evaporated and cooled as supply air, and is delivered to the user under the action of the blower. This unit is equivalent to part of the fresh air undergoing four indirect evaporative coolings and one direct evaporative cooling, which can obtain fresh air with a temperature lower than the dew point temperature of the fresh air. Then, through direct evaporative cooling and humidification, low-temperature supply air that meets the use requirements can be obtained. The system has significant energy-saving effects and is very practical.

[0032] In the description of the present invention, it should be understood that the terms "top", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite multi-stage evaporative cooling air unit, comprising a box (29), characterized in that: The box body (29) includes, from left to right, a fresh air pre-cooling section, a first indirect evaporative cooling section, a second indirect evaporative cooling section, a fresh air re-cooling section, a direct evaporative cooling section and a blower section; The fresh air precooling section comprises an air inlet (1) located on one side of the box body (29), and a primary filter (2) connected to the air inlet (1), and one side of the primary filter (2) is connected to a precooling fin heat exchanger (3); A first indirect evaporative cooling section is provided on one side of the fresh air precooling section, a first indirect evaporative air-to-air heat exchanger (21) is provided in the first indirect evaporative cooling section, and a first indirect evaporative spray row (4), a first indirect evaporative air outlet (5) and a first indirect evaporative fan (6) are sequentially provided above the first indirect evaporative air-to-air heat exchanger (21); A second indirect evaporative cooling section is provided on the other side of the first indirect evaporative cooling section, a second indirect evaporative air-to-air heat exchanger (20) is provided in the second indirect evaporative cooling section, and a second indirect evaporative spray row (9), a second indirect evaporative fan (8) and a second indirect evaporative exhaust port (7) are sequentially provided above the second indirect evaporative air-to-air heat exchanger (20); A direct evaporative cooling filler (12) is arranged in the fresh air re-cooling section, a direct evaporative spray row (11) is arranged above the direct evaporative cooling filler (12), and a water baffle (13) is arranged on one side of the direct evaporative cooling filler (12).

2. A composite multi-stage evaporative cooling air unit according to claim 1, characterized in that: A re-cooling fin heat exchanger (10) is provided in the fresh air re-cooling section. The re-cooling fin heat exchanger (10) is located on one side of the direct evaporative cooling filler (12). A direct evaporative water tank (17) is provided below the direct evaporative cooling filler (12).

3. A composite multi-stage evaporative cooling air unit according to claim 2, characterized in that: A direct evaporation spray pump (18) is arranged in the direct evaporation water tank (17). After the fresh air passes through the fresh air pre-cooling section, the primary indirect evaporation cooling and the secondary indirect evaporation cooling, it enters the cold water of the re-cooling fin heat exchanger (10) through the direct evaporation spray pipeline (19) connected to the direct evaporation spray pump (18) for heat exchange under the action of the direct evaporation spray pump (18). After the fresh air is cooled by isohumidification, it enters the direct evaporation cooling filler (12).

4. The composite multi-stage evaporative cooling air unit according to claim 1, characterized in that: An indirect evaporative water tank (26) is arranged below the first indirect evaporative cooling section and the second indirect evaporative cooling section. A precooling circulation pump (27) is arranged in the indirect evaporative water tank (26). The precooling circulation pump (27) is connected to one end of the precooling fin heat exchanger (3). The other end of the precooling fin heat exchanger (3) is connected to the indirect evaporative water tank (26) via a precooling heat exchange pipeline (28).

5. The composite multi-stage evaporative cooling air unit according to claim 4, characterized in that: An indirect evaporation spray solenoid valve (24) and a drain valve (25) are provided on one side of the indirect evaporation water tank (26); the indirect evaporation spray solenoid valve (24) is connected to the first indirect evaporation spray row (4) and the second indirect evaporation spray row (9) through an indirect evaporation spray pipeline (23).

6. The composite multi-stage evaporative cooling air unit according to claim 3, characterized in that: A water replenishment solenoid valve (16) is provided on one side of the direct evaporation water tank (17) for replenishing water in a timely manner according to the water level of the direct evaporation water tank (17).

7. The composite multi-stage evaporative cooling air unit according to claim 1, characterized in that: The air supply section comprises an air supply fan (14) and an air supply port (15); the fresh air that has undergone four indirect heat exchanges and one direct evaporation cooling is delivered from the air supply port (15) to users who use cooling under the action of the air supply fan (14).

8. The composite multi-stage evaporative cooling air unit according to claim 1, characterized in that: The direct evaporative cooling filler (12) is made of PVC sheets and high-strength anti-corrosion and flame-retardant corrugated cardboard sheets stacked alternately.

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