CN111637569A - Indirect evaporation air cooling device - Google Patents
Indirect evaporation air cooling device Download PDFInfo
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- CN111637569A CN111637569A CN202010709820.3A CN202010709820A CN111637569A CN 111637569 A CN111637569 A CN 111637569A CN 202010709820 A CN202010709820 A CN 202010709820A CN 111637569 A CN111637569 A CN 111637569A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
Abstract
The invention relates to an indirect evaporative air cooling device, which comprises a shell, a surface air cooler, a circulating water pump, a circulating water evaporative cooling module, a wet film, a first water collecting tray, a second water collecting tray, a water storage tank, a spray water returning tank, a spray water pump, a water supplementing device, an internal circulating fan, an external circulating fan, a spraying device and a heat exchanger, wherein the surface air cooler, the circulating water pump, the circulating water evaporative cooling module, the wet film, the first water collecting tray, the second water collecting tray; the natural wind entering the device is pre-cooled, and the cooled cold air carries out convective evaporation cooling on the filler and the cooling water in the wet film, so that the cooling water is cooled to be water close to the temperature of an environmental wet bulb. It is through optimizing the flow of cooling and evaporation, and the evaporation sprays the mode and optimizes for whole evaporation efficiency and cooling efficiency promote by a wide margin, and the device is also compacter, compares current multistage evaporation cooling unit and has reduced volume and weight by a wide margin.
Description
The invention relates to the technical field of indirect evaporative air cooling, in particular to a dew point type indirect evaporative air cooling device with an air pre-cooling module.
Background
The evaporative cooling air conditioning technology is an environment-friendly, efficient and economic cooling mode, can greatly reduce the power consumption and reduce the emission of greenhouse gases and CFC (carbon fiber), and is widely used in industrial plants at present. However, the conventional direct evaporation device can only reduce the temperature of air and circulating water to be close to the wet bulb temperature, the air humidity is high, and the temperature is still high in the high-temperature period in summer. The dew point type evaporative cooling unit can better solve the problem, but the prior similar devices have large volume, not compact design, heavy weight and low overall efficiency. The main problems of the prior devices are that no system design is carried out between air precooling and evaporation, the precooling water temperature is not low enough, the efficiency of an evaporation section is not high enough, and the efficiency and the cooling capacity of the whole machine are to be improved. At present, a mainstream indirect evaporative cooling device can only cool hot air to a temperature close to a wet bulb temperature through natural cooling, and the temperature is usually the wet bulb temperature plus (2-6) DEG C.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an indirect evaporative air cooling device adopting a water evaporative air cooling treatment module with precooling, the overall evaporation efficiency and the cooling efficiency are greatly improved by optimizing the flow of cooling and evaporation, the device is compact, and the volume and the weight are greatly reduced compared with the existing multistage evaporative cooling unit.
The method comprises the steps of precooling air by using cold water, and continuing to evaporate and cool the precooled air by using a direct evaporation module; the temperature of the circulating water flowing into the direct evaporation module and the air flowing out of the direct evaporation module are always the lowest temperature of the whole system, and the temperature approaches the dew point temperature of the outside air when the system is in a low load state. The air close to the dew point temperature is used for cooling the external heat load in the indirect evaporation heat exchange process, the cooling effect in the high-temperature period in summer can be obviously improved, the outlet air temperature can be lower than the wet bulb temperature, and the effect of being 2-4 ℃ higher than the dew point temperature can be achieved under the normal condition under the rated load. The air cleanliness after being treated by the direct evaporation module is greatly improved, the heat exchanger of the indirect evaporation module can be prevented from scaling, and dust in the air is deposited in the sedimentation pollution discharge module through washing treatment and is discharged out of the system.
The technical scheme of the implementation case of the invention is as follows:
an indirect evaporative air cooling device comprises a shell, a surface air cooler, a circulating water pump, a circulating water evaporative cooling module, a wet film, a first water collecting tray, a second water collecting tray, a water storage tank, a spray water return tank, a spray water pump, a water supplementing device, an internal circulating fan, an external circulating fan, a spraying device and a heat exchanger, wherein the surface air cooler, the circulating water pump, the circulating water evaporative cooling module, the wet film, the first water collecting tray, the second water collecting tray and the;
the shell is provided with an outer circulation air inlet, an outer circulation air outlet, an inner circulation air inlet and an inner circulation air outlet, the outer circulation air inlet is located on the side portion of the shell and connected with the surface air cooler, the outer circulation air outlet is located on the upper portion of the shell and connected with the outer circulation fan, the inner circulation air inlet is located above the side portion of the shell and connected with one end of a first channel of the heat exchanger, and the inner circulation air outlet is located at the position of the first channel
The inner circulation fan is positioned between the inner circulation air outlet or the inner circulation air inlet and the heat exchanger;
one end of a second channel of the heat exchanger is surrounded with the shell and the circulating water evaporative cooling module to form an external circulating air outlet channel, the other end of the second channel of the heat exchanger is surrounded with the shell, the first water collecting tray, the second water collecting tray and the circulating water evaporative cooling module to form an external circulating air inlet channel, the external circulating fan is positioned in the external circulating air outlet channel, and the surface cooler, the wet film and the spraying device are positioned in the external circulating air inlet channel;
the circulating water evaporative cooling module is positioned below the external circulating fan and comprises evaporative cooling filler and a spraying device, and the evaporative cooling filler is positioned below the spraying device; the wet film is positioned below the circulating water evaporative cooling module, the surface cooler and the external circulating air inlet are positioned in the front of the wet film, the wet film is obliquely arranged, the first water collecting tray is positioned below the wet film, the water storage tank is positioned below the first water collecting tray, the first water collecting tray is connected with the water storage tank through a pipeline, the water replenishing device is communicated with the water storage tank through a pipeline, the water inlet and the water outlet of the circulating water pump are respectively connected with the water collecting tank and the water inlet end of the surface cooler through pipelines, and the water outlet end of the surface cooler is connected with the spraying device; the spraying device is positioned at the lower end of an air inlet of a second channel of the heat exchanger, the second water collecting tray is positioned at the lower end of the spraying device, the spraying water return tank is positioned below the second water collecting tray, and the second water collecting tray is connected with the spraying water return tank through a pipeline; the first water collecting tray, the circulating water pump, the water storage tank, the surface cooler, the spraying device, the evaporative cooling filler and the wet film form a wet film circulating water system together, and a second channel of the heat exchanger, the spraying device, the second water collecting tray, the spraying water pump and the spraying water return tank form a spraying circulating water system together;
when the device is operated, circulating water is pumped into the surface cooler through the circulating water pump, enters the circulating water evaporative cooling module through a pipeline, is uniformly sprayed above the evaporative cooling filler by the spraying device, and uniformly drops on the wet film after being cooled, and then flows into the water collecting tank below from the wet film;
the spraying water pump pumps water in the spraying water return tank to the spraying device, the spraying device sprays water on the second channel of the heat exchanger, and the sprayed water flows out to the second water collecting disc along the second channel of the heat exchanger and then flows back to the spraying water return tank;
the external circulation fan is started, outdoor air enters the external circulation air inlet channel through the external circulation air inlet, is precooled by the surface cooler and is humidified by the wet film to form cold air, and then the cold air is conveyed to the second channel of the heat exchanger to exchange heat with hot air in the first channel of the heat exchanger, is output to the external circulation air outlet channel and is discharged through the external circulation air outlet;
and the internal circulation fan is started, hot air enters the first channel of the heat exchanger through the internal circulation air inlet to exchange heat with cold air in the second channel of the heat exchanger, and the hot air is discharged through the internal circulation air outlet.
Preferably, the surface cooler is a fin type heat exchange surface cooler.
Preferably, the device further comprises an air filter screen, wherein the air filter screen is arranged at the position of the external circulation air inlet.
Preferably, the external circulation fan and the internal circulation fan are both EC centrifugal fans.
Preferably, the device further comprises a sedimentation sewage device, the sedimentation sewage device is arranged in the water storage tank, the water inlet of the sedimentation sewage device is connected with the first water collecting disc through a pipeline, circulating water flows out of the first water collecting disc to the sedimentation sewage device, sludge is deposited in the sedimentation sewage device, and clean circulating water flows into the water storage tank; the sedimentation sewage discharge device is provided with a sewage discharge valve, and discharges sludge through timed sewage discharge.
Compared with the prior art, the invention has the beneficial effects that: the surface air cooler is arranged at the front end of the wet film air inlet to pre-cool the external air, so that the temperature of the external air is reduced, the cooled air is humidified and cooled by the wet film to obtain cold air and circulating water which are close to the dew point temperature, the circulating water flowing into the direct evaporation module and the air temperature flowing out of the direct evaporation module are always the lowest in the whole system, and the temperature approaches the dew point temperature of the external air when the system is in a low load state. The air close to the dew point temperature is used for cooling the external heat load in the indirect evaporation heat exchange process, the cooling effect in the high-temperature period in summer can be obviously improved, the outlet air temperature can be lower than the wet bulb temperature, and the effect of being 2-4 ℃ higher than the dew point temperature can be achieved under the normal condition under the rated load. The air cleanliness after being treated by the direct evaporation module is greatly improved, the heat exchanger of the indirect evaporation module can be prevented from scaling, and dust in the air is deposited in the sedimentation pollution discharge module through washing treatment and is discharged out of the system.
Drawings
FIG. 1 is a schematic view of an indirect evaporative air cooling unit of the present invention;
104. an internal circulation air inlet; 105. an internal circulation air outlet; 106. an external circulation air outlet; 107. an external circulation air inlet; 11. a surface cooler; 12. a water circulating pump; 131. evaporative cooling of the packing; 132. a spraying device; 14. wet film forming; 16. a water storage tank; 17. an internal circulation fan; 18. an external circulation fan; 19. a heat exchanger; 20. a spraying device; 21. a sedimentation sewage draining device; 22. spraying water to return to the tank; 23. a spray water pump; 24. a first water collection tray; 25. a second water collection tray.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
FIG. 1 is a schematic view of an indirect evaporative air cooling apparatus of the present invention; an indirect evaporative air cooling device comprises a shell, a surface air cooler 11, a circulating water pump 12, a circulating water evaporative cooling module, a wet film 14, a first water collecting tray 24, a second water collecting tray 25, a water storage tank 16, a spray water returning tank 22, a spray water pump 23, a water supplementing device, an internal circulating fan 17, an external circulating fan 18, a spraying device 20 and a heat exchanger 19, wherein the surface air cooler 11, the circulating water pump 12, the circulating water evaporative cooling module, the wet film 14, the first water collecting tray 24, the second; wherein, the shell is used as a support carrier of functional devices of the device, specifically, the shell is provided with an external circulation air inlet 107, an external circulation air outlet 106, an internal circulation air inlet 104 and an internal circulation air outlet 105, the external circulation air inlet is positioned on the side part of the shell and connected with the surface air cooler, the external circulation air outlet is positioned on the upper part of the shell and connected with an external circulation fan, the internal circulation air inlet is positioned on the upper part of the side part of the shell and connected with one end of a first channel of a heat exchanger, the internal circulation air outlet is positioned below the side part of the shell and connected with the other end of the first channel of the heat exchanger, the internal circulation fan is positioned between the internal circulation air outlet or the internal circulation air inlet and the heat exchanger, preferably, the internal circulation fan 17 is an EC centrifugal fan, one end of a second channel of the heat exchanger, the shell and a circulating, the other end of the second channel of the heat exchanger is surrounded with the shell, the first water collecting tray 24, the second water collecting tray 25 and the circulating water evaporative cooling module to form an external circulating air inlet channel, the external circulating fan is positioned in the external circulating air outlet channel, and the surface cooler, the wet film and the spraying device are positioned in the external circulating air inlet channel. The circulating water evaporative cooling module is located below the external circulating fan 18, and in order to meet the structural function of the device, the external circulating fan is preferably an EC centrifugal fan.
In the invention, the circulating water evaporative cooling module carries out evaporative cooling and cooling on the circulating water heated from the surface air cooler, specifically, the circulating water evaporative cooling module comprises an evaporative cooling filler 131 and a spraying device 132, and the evaporative cooling filler 131 is positioned below the spraying device 132; in the invention, a wet film is used as a functional module for direct evaporation cooling and is positioned below a circulating water evaporation cooling module, a first water collecting tray 24 is positioned below a wet film 14, a water storage tank 16 is positioned below the first water collecting tray 24, the first water collecting tray is connected with the water storage tank through a pipeline, a water replenishing device is communicated with the water storage tank 16 through a pipeline, a surface air cooler 11 and an external circulation air inlet 107 are positioned in front of the wet film 14, the wet film 14 is obliquely arranged, a water inlet and a water outlet of a circulating water pump 12 are respectively connected with the water storage tank and a water inlet end of the surface air cooler 11 through pipelines, a water outlet end of the surface air cooler 11 is connected with a spraying device 132, and the spraying device uniformly sprays water conveyed from the surface air cooler on an evaporation cooling filler; the spraying device is positioned at the lower end of an air inlet of a second channel of the heat exchanger, the second water collecting tray is positioned at the lower end of the spraying device, the spraying water return tank is positioned below the second water collecting tray, and the second water collecting tray is connected with the spraying water return tank through a pipeline; the first water collecting tray, the circulating water pump, the water storage tank, the surface cooler, the spraying device, the evaporative cooling filler and the wet film form a wet film circulating water system together, and the second channel, the spraying device, the second water collecting tray, the spraying water pump and the spraying water return tank of the heat exchanger form a spraying circulating water system together.
The wet film circulating water system and the spraying circulating water system are independent from each other, the wet film circulating water system plays a role in precooling, humidifying and washing air, external air passes through the surface air cooler and the wet film, and dust mixed with the external air flows into the wet film circulating water storage tank after being discharged, so that the problem that the external air is mixed with dust can be solved, and the spraying circulating water system is a closed circulating system and is free from external pollution, so that the problems that a spray head of a spraying device is blocked and a heat exchanger generates dirt to influence heat exchange are avoided.
The connection for the entire air circulation system configuration is as follows:
as shown in fig. 1, a-a1 is a flow direction line of outdoor air in an external circulation channel, and an external circulation air inlet, a surface cooler, a wet film, a spraying device, a second channel of a heat exchanger, an external circulation fan and an external circulation outlet are sequentially connected together to form the external circulation channel; A-A2 is a flow direction circuit of outdoor air cooling circulating water, and an external circulating air inlet, a surface cooler, a wet film, an evaporative cooling filler, a spraying device, an external circulating fan and an external circulating outlet are sequentially connected together to form a circulating water cooling channel; B-B is a flow direction line of indoor air in the internal circulation channel, and the internal circulation air inlet, the first heat exchange channel, the internal circulation fan and the internal circulation air outlet are sequentially connected together to form the internal circulation channel; when the indirect evaporative air cooling device works, outdoor air enters an external circulation channel from an external circulation air inlet, is cooled by a surface cooler and then enters a wet film, the surface of the wet film is humidified and cooled, an external circulation fan adsorbs a part of precooled external air to carry out counter-current convection with circulating water in evaporative cooling filler, the circulating water is cooled by air cooling, the other part of precooled external air enters a heat exchanger, the processes of evaporative cooling heat transfer and the like are carried out on the surface of the heat exchanger, the internal circulation hot air is cooled, and the heated outdoor air is blown out of an external circulation air outlet by the external circulation fan; the hot air enters the internal circulation channel from the internal circulation air inlet, is blown into the room through the internal circulation air outlet by the internal circulation fan after the surface of the indirect evaporation heat exchanger is cooled, the outdoor air is discharged after the heat exchange and temperature rise of the external circulation channel, and only the outdoor air is used as a cold source in the whole cooling process to carry out heat exchange, cooling and temperature reduction on the indoor hot air. Meanwhile, outdoor air enters the evaporative cooling filler after being precooled, humidified and cooled, and is subjected to convective evaporation with heated circulating water to cool the circulating water, so that the temperature of the circulating water on a wet film is close to the dew point temperature. In this embodiment, the outdoor air refers to air introduced into the room through the external circulation intake, and the hot air refers to air introduced into the room through the internal circulation intake.
The above is the introduction of the structure and connection relationship of the indirect evaporative air cooling device, and the following is a detailed introduction of the process steps for realizing the operation function of the indirect evaporative air cooling device under a certain working condition:
air with the external temperature of 35 ℃ and the relative humidity of 60% is pre-cooled by a surface air cooler at 28 ℃ to generate an equal-humidity cooling process, the water speed and the air intake of the surface air cooler are controlled, the air with the temperature of 31 ℃ and the relative humidity of 75% can be obtained at minimum, the air with the temperature of 31 ℃ enters a wet film and is subjected to convective evaporation with a water curtain in the wet film, the water curtain in the wet film is formed by spraying evaporation cooling filler on the wet film by circulating water in a water storage tank, the circulating water is conveyed to a spraying device by the surface air cooler, the water temperature of 28 ℃ circulating water in the surface air cooler is increased to 29 ℃ after heat exchange with the air with the temperature of 35 ℃, the circulating water with the temperature of 29 ℃ is sprayed on the evaporation cooling filler, and the water with the temperature of 32.5 ℃ is changed into water after the convective. After precooling, air with the temperature of 31 ℃ and the relative humidity of 75 percent is evaporated in a convection way with a wet film water curtain at the temperature of 32.5 ℃, the air is humidified and cooled, and the flow falling speed, the air inlet speed and the convection contact area of the water curtain are controlled, the relative humidity is humidified to be more than 96 percent and close to 100 percent, the temperature of the water curtain is close to the wet bulb temperature at the moment, the corresponding wet bulb temperature is 27 ℃ under the dry bulb temperature of 31 ℃ and the relative humidity of 75 percent, the lowest temperature of the water curtain can be controlled to be 27 ℃, the wet film water curtain flows down into the water storage tank after being cooled, the filler water curtain is cooled to 27 ℃, air at 31 ℃ is humidified and cooled to be 30 ℃, one part of air with 100 percent of relative humidity enters a second channel in the heat exchanger to exchange heat with hot air at 37 ℃ in a first channel of the heat exchanger and then is discharged through an external circulation air outlet, the other part of air enters a circulating water evaporative cooling module to exchange heat with circulating water in a convection way and is discharged through an external circulation air outlet, and circulating water at 27 ℃ is circularly conveyed to a surface cooler to pre-cool external air. The indirect evaporative air cooling device of the invention can exchange heat and cool the hot air at 37 ℃ to 33.5 ℃.
Precooling is carried out without setting a surface cooler in comparison: air with the external temperature of 35 ℃ and the relative humidity of 60% directly enters the wet film and the evaporative cooling filler and generates convection with a water curtain in the wet film, the water curtain in the wet film sprays the evaporative cooling filler by circulating water, the circulating water is conveyed to a spraying device by a surface air cooler and falls into the wet film from the evaporative filler through convection evaporation with the air, the circulating water is in a water storage tank, and the circulating water with the temperature of 28 ℃ is changed into water with the temperature of about 32 ℃ after absorbing heat by convection evaporation with the air in the evaporative cooling filler and falls into the wet film. Air with the temperature of 35 ℃ and the relative humidity of 60 percent is evaporated in a convection way with a wet film water curtain with the temperature of 32 ℃, the air is humidified and cooled, and the flow velocity, the air inlet speed and the convection contact area of the water curtain are controlled, the relative humidity is humidified to be more than 96 percent and close to 100 percent, the temperature of the water curtain is close to the wet bulb temperature at the moment, the wet bulb temperature corresponding to the relative humidity of 60 percent at the dry bulb temperature of 35 ℃ is 28 ℃, the lowest temperature of the water curtain can be controlled to be 28 ℃, the wet film water curtain is cooled to 28 ℃ and then flows down into the water storage tank, air at 35 ℃ is humidified and cooled to become air at 33 ℃, a part of air with 100% of relative humidity enters a second channel in the heat exchanger to exchange heat with hot air at 37 ℃ in a first channel of the heat exchanger and then is discharged through an external circulation air outlet, the other part of air enters a circulating water evaporative cooling module to exchange heat with circulating water in a convection way and is discharged through the external circulation air outlet, and circulating water at 28 ℃ is circularly conveyed to a surface cooler to pre-cool external air. The air cooling device without the pre-cooling device can exchange heat and cool 37 ℃ hot air to 35 ℃, and the power consumption of the air cooling device is increased by 15% compared with that of an indirect evaporative air cooling device adopting the pre-cooling device.
According to the comparison, the surface cooler is arranged at the position of the external circulation air inlet to pre-cool the inlet air, the air temperature is reduced, the humidity is increased, the corresponding wet bulb temperature is reduced, the water flowing out of the wet film is close to the wet bulb temperature by controlling the air speed of the external circulation fan, the flow speed of the filler water and the contact area of the air and the water, the pre-cooled wet bulb temperature is lower, the obtained water temperature is lower, and the external air is pre-cooled through the surface cooler with lower water temperature to obtain cold air with lower temperature.
In the operation process of the device, circulating water is pumped into the surface cooler through a circulating water pump and then enters a circulating water evaporative cooling module through a pipeline, is uniformly sprayed above evaporative cooling fillers by a spraying device, and uniformly drops on a wet film after being cooled, and then flows into a water collecting tank below from the wet film; the spraying water pump pumps water in the spraying water return tank to the spraying device, the spraying device sprays water on the second channel of the heat exchanger, and the sprayed water flows out to the second water collecting disc along the second channel of the heat exchanger and then flows back to the spraying water return tank; the external circulation fan is started, outdoor air enters the external circulation air inlet channel through the external circulation air inlet, is precooled by the surface cooler and is humidified by the wet film to form cold air, and then is conveyed to the second channel of the heat exchanger to exchange heat with hot air in the first channel of the heat exchanger, and is output to the external circulation air outlet channel to be discharged through the external circulation air outlet; and the internal circulation fan is started, hot air enters the first channel of the heat exchanger through the internal circulation air inlet to exchange heat with cold air in the second channel of the heat exchanger, and is discharged through the internal circulation air outlet. In order to meet the structural function of the device, the internal circulation fan is preferably an EC centrifugal fan.
In the operation process of the indirect evaporative air cooling device, circulating water close to the dew point temperature is pumped into the surface cooler through the circulating water pump, the surface cooler precools and exchanges heat with outside air, the temperature of the circulating water rises, the circulating water in the surface cooler enters the circulating water evaporative cooling module through the pipeline, the circulating water is uniformly sprayed above the evaporative cooling filler by the spraying device, and the circulating water is uniformly dripped on the wet film after being cooled and then flows into the first water collecting tank below from the wet film.
The indirect evaporative air cooling device can be directly used for natural heat dissipation of a data center machine room, and the cold air temperature at the wet film is close to the dew point temperature, so that the heat exchange efficiency in the heat exchanger is higher, and the energy is saved for the power consumption of the whole data center.
The precooled external air enters the wet film and is subjected to an isenthalpic humidification process with circulating water in the wet film, so that the temperature of the circulating water in the wet film can be reduced to the dew point temperature, and circulating water and cold air which are close to the dew point temperature are obtained; like this, the cold air that is close dew point temperature is used and is carried out cold and hot exchange with the hot-air in the first passageway in the heat exchanger second passageway to reach and cool down the computer lab that produces hot-air, because the indirect evaporation cold air temperature of cold air temperature traditional relatively is lower, thereby makes the cooling effect better, and the consumption is lower.
Through being provided with atomizer at first passageway import department, it sprays the first passageway before precooling air gets into the first passageway, increases evaporative cooling, and it is higher to have further improved hot-air heat exchange efficiency in the heat exchanger.
In order to maximize the intake air precooling efficiency, the length from the upper end to the lower end of the external circulation air inlet is preferably equal to the vertical length from the upper end to the lower end of the surface cooler; the length from the upper end to the lower end of the external circulation air inlet is equal to the vertical length from the upper end to the lower end of the wet film.
In order to prevent natural air from entering the device together with dust and impurities to pollute the internal environment, an air filter screen is preferably arranged at the air inlet.
In order to increase the contact area between the external air and the surface cooler for precooling and prolong the time and increase the temperature difference for precooling and cooling the external air, the surface cooler is preferably a finned heat exchanger.
In order to prevent the surface air cooler from being blocked by impurities in water, the evaporative cooling air device preferably further comprises a water filtering device, and two ends of the water filtering device are respectively connected with the outlet of the circulating water pump and the water inlet of the surface air cooler through water pipes.
In order to prevent the impurities carried by the outside air from flowing into the water storage tank along with the water curtain on the wet film to cause dirt, preferably, the device further comprises a sedimentation sewage discharge device 21 which is arranged inside the water storage tank, the water inlet of the sedimentation sewage discharge device is connected with the first water collecting disc through a pipeline, the circulating water flows out of the first water collecting disc into the sedimentation sewage discharge device, the sludge is deposited in the sedimentation sewage discharge device, and clean circulating water flows into the water storage tank; the sedimentation sewage discharge device is provided with a sewage discharge valve, and discharges sludge through timed sewage discharge.
In the present embodiment, the evaporative cooling filler and the wet film both function to increase the contact area of water with air and the time, and in the present embodiment, the filler may be replaced with the wet film.
According to the invention, the surface cooler is arranged at the front end of the inlet air of the wet film to pre-cool the external air, so that the temperature of the external air is reduced, and the cooled air is humidified and cooled by the wet film to obtain the cold air with lower temperature.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. An indirect evaporative air cooling apparatus, comprising: the device comprises a shell, a surface air cooler, a circulating water pump, a circulating water evaporative cooling module, a wet film, a first water collecting tray, a second water collecting tray, a water storage tank, a spray water return tank, a spray water pump, a water supplementing device, an internal circulating fan, an external circulating fan, a spraying device and a heat exchanger, wherein the surface air cooler, the circulating water pump, the circulating water evaporative cooling module, the wet film, the first water collecting tray, the second water collecting tray;
the shell is provided with an external circulation air inlet, an external circulation air outlet, an internal circulation air inlet and an internal circulation air outlet, the external circulation air inlet is positioned on the side part of the shell and connected with the surface air cooler, the external circulation air outlet is positioned on the upper part of the shell and connected with the external circulation fan, the internal circulation air inlet is positioned above the side part of the shell and connected with one end of a first channel of the heat exchanger, the internal circulation air outlet is positioned below the side part of the shell and connected with the other end of the first channel of the heat exchanger, and the internal circulation fan is positioned between the internal circulation air outlet or the internal circulation air inlet and the heat exchanger;
one end of a second channel of the heat exchanger is surrounded with the shell and the circulating water evaporative cooling module to form an external circulating air outlet channel, the other end of the second channel of the heat exchanger is surrounded with the shell, the first water collecting tray, the second water collecting tray and the circulating water evaporative cooling module to form an external circulating air inlet channel, the external circulating fan is positioned in the external circulating air outlet channel, and the surface cooler, the wet film and the spraying device are positioned in the external circulating air inlet channel;
the circulating water evaporative cooling module is positioned below the external circulating fan and comprises evaporative cooling filler and a spraying device, and the evaporative cooling filler is positioned below the spraying device; the wet film is positioned below the circulating water evaporative cooling module, the surface cooler and the external circulating air inlet are positioned in the front of the wet film, the wet film is obliquely arranged, the first water collecting tray is positioned below the wet film, the water storage tank is positioned below the first water collecting tray, the first water collecting tray is connected with the water storage tank through a pipeline, the water replenishing device is communicated with the water storage tank through a pipeline, the water inlet and the water outlet of the circulating water pump are respectively connected with the water collecting tank and the water inlet end of the surface cooler through pipelines, and the water outlet end of the surface cooler is connected with the spraying device; the spraying device is positioned at the lower end of an air inlet of a second channel of the heat exchanger, the second water collecting tray is positioned at the lower end of the spraying device, the spraying water return tank is positioned below the second water collecting tray, and the second water collecting tray is connected with the spraying water return tank through a pipeline; the first water collecting tray, the circulating water pump, the water storage tank, the surface cooler, the spraying device, the evaporative cooling filler and the wet film form a wet film circulating water system together, and a second channel of the heat exchanger, the spraying device, the second water collecting tray, the spraying water pump and the spraying water return tank form a spraying circulating water system together;
when the device is operated, circulating water is pumped into the surface cooler through the circulating water pump, enters the circulating water evaporative cooling module through a pipeline, is uniformly sprayed above the evaporative cooling filler by the spraying device, and uniformly drops on the wet film after being cooled, and then flows into the water collecting tank below from the wet film;
the spraying water pump pumps water in the spraying water return tank to the spraying device, the spraying device sprays water on the second channel of the heat exchanger, and the sprayed water flows out to the second water collecting disc along the second channel of the heat exchanger and then flows back to the spraying water return tank;
the external circulation fan is started, outdoor air enters the external circulation air inlet channel through the external circulation air inlet, is precooled by the surface cooler and is humidified by the wet film to form cold air, and then the cold air is conveyed to the second channel of the heat exchanger to exchange heat with hot air in the first channel of the heat exchanger, is output to the external circulation air outlet channel and is discharged through the external circulation air outlet;
and the internal circulation fan is started, hot air enters the first channel of the heat exchanger through the internal circulation air inlet to exchange heat with cold air in the second channel of the heat exchanger, and the hot air is discharged through the internal circulation air outlet.
2. The indirect evaporative air cooling device of claim 1, wherein: the surface cooler is a fin type heat exchange surface cooler.
3. The indirect evaporative air cooling device of claim 1, wherein: the device also comprises an air filter screen, wherein the air filter screen is arranged at the position of the external circulation air inlet.
4. The indirect evaporative air cooling device of claim 1, wherein: the external circulation fan and the internal circulation fan are both EC centrifugal fans.
5. The indirect evaporative air cooling device of claim 1, wherein: the device also comprises a sedimentation sewage discharge device, the sedimentation sewage discharge device is arranged in the water storage tank, the water inlet of the sedimentation sewage discharge device is connected with the first water collecting disc through a pipeline, circulating water flows out of the first water collecting disc to the sedimentation sewage discharge device, sludge is deposited in the sedimentation sewage discharge device, and clean circulating water flows into the water storage tank; the sedimentation sewage discharge device is provided with a sewage discharge valve, and discharges sludge through timed sewage discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010709820.3A CN111637569A (en) | 2020-07-22 | 2020-07-22 | Indirect evaporation air cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010709820.3A CN111637569A (en) | 2020-07-22 | 2020-07-22 | Indirect evaporation air cooling device |
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| CN111637569A true CN111637569A (en) | 2020-09-08 |
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| CN202010709820.3A Pending CN111637569A (en) | 2020-07-22 | 2020-07-22 | Indirect evaporation air cooling device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268326A (en) * | 2020-11-12 | 2021-01-26 | 依米康智能工程有限公司 | Indirect evaporative cooler and control method |
| CN113647331A (en) * | 2021-07-26 | 2021-11-16 | 深圳市万维空调净化工程有限公司 | Multifunctional air treatment system for animal husbandry |
| WO2022110670A1 (en) * | 2020-11-26 | 2022-06-02 | 华为数字能源技术有限公司 | Indirect evaporative cooling device |
-
2020
- 2020-07-22 CN CN202010709820.3A patent/CN111637569A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268326A (en) * | 2020-11-12 | 2021-01-26 | 依米康智能工程有限公司 | Indirect evaporative cooler and control method |
| CN112268326B (en) * | 2020-11-12 | 2024-05-14 | 依米康智能工程有限公司 | Indirect evaporative cooler and control method |
| WO2022110670A1 (en) * | 2020-11-26 | 2022-06-02 | 华为数字能源技术有限公司 | Indirect evaporative cooling device |
| CN113647331A (en) * | 2021-07-26 | 2021-11-16 | 深圳市万维空调净化工程有限公司 | Multifunctional air treatment system for animal husbandry |
| CN113647331B (en) * | 2021-07-26 | 2022-07-26 | 深圳市万维空调净化工程有限公司 | Multifunctional air treatment system for animal husbandry |
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