Cooling capacity recovery type multi-stage indirect evaporation fresh air handling unit

Abstract

The utility model discloses a cooling capacity recovery type multistage indirect evaporation fresh air handling unit which comprises an upper frame and a lower frame, and a fresh air indirect evaporation cooling section, a return air recooling and indirect evaporation cooling section and an air supply section are arranged in the upper frame. A fresh air indirect evaporation air inlet, a fresh air spraying water tank, a return air spraying water tank and a return air inlet are arranged in the lower frame; when the unit is in a cold supply working condition in summer, equivalently, part of fresh air is subjected to two times of indirect evaporative cooling and one time of indirect heat exchange cooling, and fresh air with the temperature lower than the fresh air dew point temperature can be obtained; when the unit is in a heating working condition in winter, only the return air re-cooling section and the indirect evaporation cooling section are used, at the moment, heat in return air is used for heating spraying water for two times of preheating of fresh air, and therefore heat recovery under the heating working condition in winter is achieved, and the unit is dual-purpose, energy-saving, environment-friendly and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy-saving evaporative cooling, in particular to a cold quantity recovery type multi-stage indirect evaporation fresh air unit. Background Technique

[0002] China has a vast territory, and there are large differences in climate in different regions. Compared with the hot and humid climate in summer along the coast, in the hot and dry regions in the northwest in summer, the direct evaporation technology can be fully utilized to provide cold air. However, the temperature of the cold air provided by direct evaporation is often 2-5 degrees Celsius higher than the wet bulb temperature of the incoming air. It is difficult to obtain a lower supply air temperature. On the other hand, if the direct evaporation cooling method is adopted, in order to pursue a lower supply air temperature, multiple sprays are required, and the moisture content in the supply air is large. In some special scenarios, such as the cooling of large workshops or industrial buildings, especially in some application scenarios where humidification is not required, it is not advisable to directly adopt the direct evaporation cooling technology.

[0003] At present, the air conditioning technology for producing cold air by evaporative cooling has been widely applied in the low-humidity environment in the northwest. In the southeastern coastal areas of China, due to the relatively high air humidity and restricted by outdoor meteorological conditions, it is not easy to achieve stable operating conditions by simply using evaporative refrigeration, or this simple evaporative refrigeration method is not applicable in occasions with special requirements for supply air temperature and humidity. Therefore, new technologies are urgently needed to expand the use of natural energy.

[0004] In addition, using evaporative cooling to produce fresh air is usually only applicable in summer. There is no existing fresh air unit that can directly use evaporative cooling technology in winter and can recover the heat of the return air. Content of the Utility Model

[0005] The purpose of the utility model is to provide a cold quantity recovery type multi-stage indirect evaporation fresh air unit to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A cold quantity recovery type multi-stage indirect evaporation fresh air unit, including a box body. The technical key point is that the box body includes an upper frame and a lower frame. Inside the upper frame, a fresh air indirect evaporation cooling section, a return air re-cooling and indirect evaporation cooling section, and a supply air section are arranged in sequence from left to right; inside the lower frame, a fresh air indirect evaporation air inlet, a fresh air spray water tank, a return air spray water tank, and a return air port are arranged in sequence from left to right.

[0007] A fresh air evaporation cooling core is arranged inside the fresh air indirect evaporation cooling section. A fresh air evaporation cooling core air inlet is arranged below the fresh air evaporation cooling core, and the fresh air evaporation cooling core air inlet is communicated with the lower frame.

[0008] An air return evaporation cooling core is provided in the air return re-cooling and indirect evaporation cooling section. An air return evaporation cooling core air inlet is provided below the air return evaporation cooling core, and the air return evaporation cooling core air inlet is communicated with the lower frame.

[0009] Preferably, a fresh air inlet is provided on one side of the fresh air indirect evaporation cooling section. A fresh air filter is provided adjacent to the fresh air inlet of the fresh air indirect evaporation cooling section. Above the fresh air evaporation cooling core, a fresh air spray row, a fresh air indirect evaporation cooling exhaust fan, and a fresh air indirect evaporation cooling exhaust air outlet are sequentially provided.

[0010] Preferably, a fresh air spray pump is provided in the fresh air spray water tank. The fresh air spray pump is connected to the fresh air spray row through a fresh air spray pipeline to achieve heat and mass exchange.

[0011] Preferably, an air return spray row, an air return indirect evaporation cooling exhaust fan, and an air return indirect evaporation cooling exhaust air outlet are sequentially provided above the air return evaporation cooling core.

[0012] Preferably, an air return spray pump is provided in the air return spray water tank. After the air return spray pump is connected to the re-cooling finned heat exchanger through an air return spray pipeline, it is communicated with the air return spray row to achieve heat and mass exchange.

[0013] Preferably, a supply fan and a supply air outlet are included in the air supply section, and the supply air outlet is located at the rightmost side of the box body.

[0014] Preferably, an air return spray water replenishment solenoid valve is further provided in the air return spray water tank for replenishing water according to the water level of the air return spray water tank.

[0015] Preferably, a fresh air spray water replenishment solenoid valve is further provided in the fresh air spray water tank for replenishing water according to the water level of the fresh air spray water tank.

[0016] Preferably, the evaporation cooling core is alternately stacked with PVC plates, high-strength anti-corrosion and flame-retardant corrugated cardboard plates, etc.

[0017] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows: When the unit is in the summer cooling condition, it is equivalent to that part of the fresh air has undergone two indirect evaporation coolings and one indirect heat exchange for temperature reduction, and fresh air with a temperature lower than the fresh air dew point temperature can be obtained; when the unit is in the winter heating condition, only the air return re-cooling and indirect evaporation cooling section is used. At this time, the heat in the air return is utilized to heat the spray water and then used for preheating the fresh air twice, so as to realize heat recovery under the winter heating condition. Therefore, it has dual functions, energy conservation and environmental protection, and has strong practicability. Description of the Drawings

[0018] Figure 1This is a schematic structural diagram of a preferred embodiment of the present utility model.

[0019] In the figure: 1. Upper frame, 2. Lower frame, 3. Fresh air inlet, 4. Fresh air filter, 5. Fresh air spray pipeline, 6. Fresh air spray row, 7. Fresh air indirect evaporation cooling exhaust port, 8. Fresh air indirect evaporation cooling exhaust fan, 9. Re-cooling finned heat exchanger, 10. Return air indirect evaporation cooling exhaust port, 11. Return air indirect evaporation cooling exhaust fan, 12. Return air spray row, 13. Return air evaporation cooling core, 14. Supply fan, 15. Supply air outlet, 16. Return air inlet, 17. Return air spray water tank, 18. Return air spray water replenishing solenoid valve, 19. Return air evaporation cooling core air inlet, 20. Return air spray pipeline, 21. Return air spray pump, 22. Fresh air spray water tank, 23. Fresh air spray water replenishing solenoid valve, 24. Fresh air evaporation cooling core air inlet, 25. Fresh air spray pump, 26. Fresh air evaporation cooling air inlet, 27. Fresh air evaporation cooling core. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figure 1 , the present utility model provides a technical solution:

[0022] A cold recovery type multi-stage indirect evaporation fresh air unit, including a box body, the box body includes two parts, an upper frame 1 and a lower frame 2. The upper frame 1 is provided with a fresh air indirect evaporation cooling section, a return air re-cooling and indirect evaporation cooling section, and a supply air section; the lower frame 2 is provided with a fresh air indirect evaporation air inlet 26, a fresh air spray water tank 22, a return air spray water tank 17, a return air inlet 16, etc.

[0023] In the part of the lower frame 2, the incoming air for fresh air evaporation cooling enters from the fresh air indirect evaporation air inlet 26 and enters the fresh air evaporation cooling core 27 through the fresh air evaporation cooling core air inlet 24. The incoming air for return air evaporation cooling enters from the return air inlet 16 in the part of the lower frame 2 and enters the return air evaporation cooling core 13 through the return air evaporation cooling core air inlet 19.

[0024] For the upper frame 1 part described above, after fresh outdoor air enters from the fresh air inlet 3, it passes through the fresh air filter 4 and then enters the fresh air evaporative cooling core 27. It undergoes heat and mass exchange with the cold water sprayed from the fresh air spray row 6 through the fresh air spray pipeline 5 under the action of the fresh air spray pump 25. 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 fresh air indirect evaporative cooling exhaust port 7 under the action of the fresh air indirect evaporative cooling exhaust fan 8 as the working air flow.

[0025] The cold water that has not evaporated in the fresh air evaporative cooling core 27 falls into the fresh air spray water tank 22, realizing the circulation of the fresh air spray water. The fresh air spray water tank 22 is also equipped with a fresh air spray water replenishment solenoid valve 23 for replenishing water according to the water level of the fresh air spray water tank.

[0026] The fresh air cooled by the fresh air indirect evaporative cooling section enters the return air re-cooling and indirect evaporative cooling section and the air supply section. The fresh air enters the re-cooling finned heat exchanger 9 and undergoes heat exchange with the cold water that enters the re-cooling finned heat exchanger 9 through the return air spray pipeline 20 under the action of the return air spray pump 21. After the fresh air is cooled again, it enters the return air evaporative cooling core 13. The return air undergoes heat and mass exchange with the cold water sprayed from the return air spray row 12 through the return air spray pipeline 20 and the re-cooling finned heat exchanger 9 under the action of the return air spray pump 21. 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 return air indirect evaporative cooling exhaust port 10 under the action of the return air indirect evaporative cooling exhaust fan 11 as the working air flow.

[0027] The cold water that has not evaporated in the return air evaporative cooling core 13 falls into the return air spray water tank 17, realizing the circulation of the return air spray water. The return air spray water tank 17 is also equipped with a return air spray water replenishment solenoid valve 18 for replenishing water according to the water level of the return air spray water tank 17.

[0028] In the air supply section, the fresh air is sent to the user from the air supply port 15 under the action of the air supply fan 14 to meet the user's cooling demand.

[0029] Preferably, for the lower frame 2 part described above, the incoming air for fresh air evaporative cooling enters from the fresh air indirect evaporative inlet 24, and the incoming air for return air evaporative cooling enters from the return air inlet 16 of the lower frame part.

[0030] In the winter heat recovery working condition:

[0031] At this time, the fresh air indirect evaporative cooling exhaust fan 8 is not started, and only the return air indirect evaporative cooling exhaust fan 11 is started.

[0032] After the fresh air outdoors enters from the fresh air inlet 3, it passes through the fresh air filter 4 and then enters the fresh air evaporative cooling core 27. At this time, the fresh air evaporative cooling core 27 is not in use. It then enters the re-cooling finned heat exchanger 9 again and exchanges heat with the hot water that enters the re-cooling finned heat exchanger 9 through the return air spray pipeline 20 under the action of the return air spray pump 21, and the temperature of the hot water decreases. After the fresh air is preheated, it enters the return air evaporative cooling core 13.

[0033] The indoor return air enters this unit from the return air inlet 16 of the lower frame 2 under the action of the return air spray exhaust fan 11, enters the return air evaporative cooling core 13 through the return air evaporative cooling core inlet 19, and exchanges heat and mass with the cold water sprayed from the return air spray exhaust 12 through the return air spray pipeline 20 and the re-cooling finned heat exchanger 9 under the action of the return air spray pump 21. The cold water is heated by the return air and its temperature also rises, while heating the fresh air synchronously and increasing the temperature of the fresh air. After the return air is cooled down, it is discharged from the return air spray exhaust port 10 under the action of the return air spray exhaust fan 11.

[0034] After the temperature of the fresh air is increased, in the air supply section, it is sent to the user from the air supply port 15 under the action of the air supply fan 14 to meet the heat demand of the user.

[0035] The hot water whose temperature has been increased in the return air evaporative cooling core 13 falls into the return air spray water tank 17, realizing the circulation of the return air spray water. The return air spray water tank 17 is also equipped with a return air spray water replenishment solenoid valve 18 for replenishing water according to the water level of the return air spray water tank 17.

[0036] The evaporative cooling core can be alternately stacked with PVC sheets, high-strength anti-corrosion and flame-retardant corrugated cardboard sheets, etc. The distance between the sheets is designed to be 2.0mm, 3.0mm, 4.0mm, etc., and the sheets are alternately stacked in a cube or cuboid shape.

[0037] The working principle of this multi-stage indirect evaporative fresh air unit is as follows:

[0038] Upper frame part: After the fresh air outdoors enters from the fresh air inlet, it passes through filtration, the first-stage cooling of fresh air evaporative cooling, the re-cooling of fresh air in the re-cooling finned heat exchanger using the cold water directly evaporated by the return air, and the second-stage cooling of return air evaporative cooling, and then is sent to the user under the action of the air supply fan.

[0039] Lower frame part: The incoming air for fresh air evaporative cooling enters from the fresh air indirect evaporation inlet and enters the fresh air evaporative cooling core through the fresh air evaporative cooling core inlet. The incoming air for return air evaporative cooling enters from the return air inlet of the lower frame part and enters the return air evaporative cooling core through the return air evaporative cooling core inlet.

[0040] In the described fresh air indirect evaporation cooling section, fresh air undergoes heat and mass exchange with the cold water from the fresh air spray row in the fresh air evaporation cooling core body. After the cold water evaporates, it takes away the heat of the fresh air to cool the fresh air. The generated water vapor, as the working air flow, is discharged from the fresh air indirect evaporation cooling air outlet under the action of the fresh air indirect evaporation cooling exhaust fan.

[0041] In the described return air re-cooling and indirect evaporation cooling section and the air supply section, return air undergoes heat and mass exchange with the cold water from the return air spray row in the return air evaporation cooling core body. After the cold water evaporates, it takes away the heat of the fresh air to cool the fresh air. The generated water vapor, as the working air flow, is discharged from the return air indirect evaporation cooling air outlet under the action of the return air indirect evaporation cooling exhaust fan.

[0042] The cold water that has not evaporated in the return air evaporation cooling core body falls into the return air spray water tank and, under the action of the return air spray pump, enters the re-cooling finned heat exchanger through the return air spray pipeline for re-cooling of the fresh air.

[0043] When the unit is in the winter heating condition, only the return air re-cooling and indirect evaporation cooling section is used. At this time, using the heat in the return air, the spray water is heated and then the fresh air is preheated in the re-cooling finned heat exchanger, and the fresh air is heated in the indirect evaporation cooling section, so as to realize heat recovery under the winter heating condition. Therefore, it can be used for two purposes with one machine.

[0044] The described air supply section includes a supply fan, an air supply outlet, etc. The fresh air that has undergone two indirect heat exchanges and one indirect heat exchange for cooling is sent to the cold-using users from the air supply outlet under the action of the supply fan.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "top", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model.

[0046] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cold recovery type multi-stage indirect evaporation fresh air unit, comprising a box, characterized in that: The box body comprises an upper frame (1) and a lower frame (2); the upper frame (1) is provided with a fresh air indirect evaporative cooling section, a return air re-cooling and indirect evaporative cooling section and an air supply section from left to right; the lower frame is provided with a fresh air indirect evaporative air inlet (26), a fresh air spray water tank (22), a return air spray water tank (17) and a return air outlet (16) from left to right; A fresh air evaporative cooling core (27) is provided in the fresh air indirect evaporative cooling section, a fresh air evaporative cooling core air inlet (24) is provided below the fresh air evaporative cooling core (27), and the fresh air evaporative cooling core air inlet (24) is connected to the lower frame (2); A return air evaporative cooling core (13) is provided in the return air re-cooling and indirect evaporative cooling section, a return air evaporative cooling core air inlet (19) is provided below the return air evaporative cooling core (13), and the return air evaporative cooling core air inlet (19) is connected to the lower frame (2).

2. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 1 is characterized in that: A fresh air inlet (3) is arranged on one side of the fresh air indirect evaporative cooling section, a fresh air filter (4) is arranged on the side of the fresh air inlet (3) close to the fresh air indirect evaporative cooling section, and a fresh air spray row (6), a fresh air indirect evaporative cooling exhaust fan (8) and a fresh air indirect evaporative cooling exhaust port (7) are arranged in sequence above the fresh air evaporative cooling core (27).

3. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 2 is characterized in that: A fresh air spray pump (25) is arranged in the fresh air spray water tank (22), and the fresh air spray pump (25) is connected to the fresh air spray row (6) via a fresh air spray pipeline (5) to achieve heat and mass exchange.

4. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 1 is characterized in that: A return air spray row (12), a return air indirect evaporative cooling exhaust fan (11) and a return air indirect evaporative cooling exhaust port (10) are sequentially arranged above the return air evaporative cooling core (13).

5. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 4 is characterized in that: A return air spray pump (21) is arranged in the return air spray water tank (17). The return air spray pump (21) is connected to the recooling fin heat exchanger (9) through the return air spray pipeline (20) and then communicated with the return air spray row (12) to achieve heat and mass exchange.

6. The cold recovery type multi-stage indirect evaporation fresh 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), and the air supply port (15) is located at the rightmost side of the box body.

7. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 5, characterized in that: The return air spray water tank (17) is also provided with a return air spray water replenishment solenoid valve (18) for replenishing water according to the water level of the return air spray water tank (17).

8. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 3 is characterized in that: A fresh air spray water replenishment solenoid valve (23) is also provided in the fresh air spray water tank (22) for replenishing water according to the water level of the fresh air spray water tank (22).

9. The cold recovery type multi-stage indirect evaporation fresh air unit according to claim 1, characterized in that: The evaporative cooling core is formed by alternately stacking PVC sheets and high-strength anti-corrosion and flame-retardant corrugated paperboard sheets.

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