CN212538130U - Indirect evaporation air cooling device - Google Patents
Indirect evaporation air cooling device Download PDFInfo
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- CN212538130U CN212538130U CN202021342135.3U CN202021342135U CN212538130U CN 212538130 U CN212538130 U CN 212538130U CN 202021342135 U CN202021342135 U CN 202021342135U CN 212538130 U CN212538130 U CN 212538130U
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- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
Abstract
The utility model relates to an indirect evaporative air cooling device, which comprises an external circulation air inlet, a surface cooler, a wet film, a water distributor, an indirect evaporative heat exchanger, a spraying module, an external circulation fan, an external circulation air outlet, an internal circulation air inlet, an internal circulation fan, an internal circulation air outlet, a wet film circulation water pump, a spraying water pump, a wet film circulation water collecting tray, a spraying water collecting tray, a wet film circulation water storage tank, a spraying water storage tank, a return air temperature and humidity sensor, a heat exchange temperature sensor and a controller; it obtains the pure low temperature air that is less than outside air wet bulb temperature through setting up surface cooler and wet membrane to outside air precooling and humidification washing, has improved the efficiency of indirect evaporation through leading evaporative cooling, can make the system keep higher cleanliness factor for a long time, need not wash, and the indirect evaporative cooling section spray the circulating water system not with outside air direct contact, has avoided spraying the problem that the module blockked up.
Description
Technical Field
The utility model relates to an air conditioner cooling technology field, concretely relates to an air cooling device who is used for indirect evaporation technique of adoption of data center.
Background
The data center needs to be cooled and refrigerated all the year round, the annual temperature and humidity control standard of a common data center is 23 +/-1 ℃ and 50 +/-10% of humidity, the temperature of hot air generated by a server of the data center is 35-45 ℃, and meanwhile, the highest ambient wet bulb temperature is less than 30 ℃ no matter in south or north China, so that the data center can be cooled by utilizing outdoor air in a ventilation or heat exchange mode. The conventional indirect evaporative air cooling device cools air by spraying water on the heat exchanger, dust and impurities in the external air can be accumulated in a water circulation system to cause blockage of a spraying module, and can be attached to the wall of the heat exchanger to reduce the heat exchange efficiency, so that the cooling efficiency of the indirect evaporative air cooling device is greatly influenced. Meanwhile, the humidification and heat transfer of the conventional indirect evaporative cooling device are completed on the indirect evaporative heat exchanger, the humidification efficiency is low, and the humidity of the outlet air of the external circulation hardly reaches 80%, so that the temperature of the internal circulation hot air can be only reduced to the range of the temperature of the external air wet bulb plus 2-6 ℃, and the temperature is far lower than the humidification efficiency of a wet film (the humidity of the air after being humidified by the wet film can reach more than 95%).
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide an indirect evaporative air cooling device with precooling and air washing and humidifying functions, which reduces the temperature of the external air to be lower than the temperature of an external air wet bulb through precooling and a preposed wet film humidifying and washing process, and then enters an indirect evaporative cooling heat exchanger, because the wet film evaporation efficiency is higher, the wet film humidifying process bears most of the humidifying task, so that the overall humidifying efficiency is improved, the refrigerating load of an indirect evaporation section is also reduced, the internal hot air can be reduced to a lower temperature, and the temperature of the external air wet bulb can be theoretically lower; meanwhile, the washed air enters the indirect evaporative cooling heat exchanger, so that the system can keep high cleanliness for a long time without being washed; through setting up two independent circulating water system, two independent water catch bowl and water storage box, inside spraying water circulating system does not with outside air direct contact, and the pollution sources has avoided spraying the problem that the module blockked up.
The method comprises the following steps of pre-cooling and humidifying outdoor air to obtain cold air and circulating water with the temperature lower than that of an outdoor wet bulb, and carrying out heat exchange and evaporative cooling on the cold air and hot return air in internal circulation; the heated circulating water is sprayed above the heat exchanger, so that the evaporative cooling efficiency can be improved; the temperature of the external air after precooling and humidifying is lower than the temperature of the wet bulb of the external air, so that the hot return air of the internal circulation can be cooled to a lower temperature, and can be reduced to approach the dew point temperature of the outdoor air under low load; like this, in the summer time period in most areas in the north, when control supply air temperature 23 ℃, can shorten the operating time that needs mechanical refrigeration to carry out the secondary cooling to in a month, when the regional air inlet temperature of server rack air inlet sets for summer high temperature period and is not higher than 27 +/-2 ℃, just can not need mechanical refrigeration throughout the year, the energy consumption in summer high temperature period will show and reduce.
The utility model discloses the technical scheme of implementation case as follows:
an indirect evaporative air cooling device comprises an external circulation air inlet, a surface cooler, a wet film, a water distributor, an indirect evaporative heat exchanger, a spraying module, an external circulation fan, an external circulation air outlet, an internal circulation air inlet, an internal circulation fan, an internal circulation air outlet, a wet film circulating water pump, a spraying water pump, a wet film circulating water collecting tray, a spraying water collecting tray, a wet film circulating water storage tank, a spraying water storage tank, a return air temperature and humidity sensor, a heat exchange temperature sensor and a controller;
the internal circulation air inlet, the indirect evaporation heat exchanger, the internal circulation fan and the internal circulation air outlet are sequentially connected together to form an internal circulation channel, and the external circulation air inlet, the surface air cooler, the wet film, the indirect evaporation heat exchanger, the spraying module, the external circulation fan and the external circulation air outlet are sequentially connected together to form a natural air-cooled external circulation channel; the return air temperature and humidity sensor is positioned near the internal circulation air inlet, and the heat exchange temperature sensor is positioned in the internal circulation channel and between the indirect evaporation heat exchanger and the internal circulation fan;
the wet film circulating water pump inlet is connected with the wet film circulating water storage tank through a pipeline, the wet film circulating water pump outlet is connected with the water distributor through a pipeline, the water distributor is arranged at the upper end of the wet film, the water distributor sprays the wet film, the wet film circulating water collecting tray is positioned below the wet film and used for collecting wet film circulating water flowing down from the wet film, and the wet film circulating water collecting tray is connected with the wet film circulating water storage tank through a pipeline; the spray water inlet is connected with the spray water storage tank through a pipeline, the spray water outlet is connected with the water inlet of the surface cooler through a pipeline, the water outlet of the surface cooler is connected with the spray module through a pipeline, the spray module is positioned above the side, close to the external circulation air outlet of the external circulation fan, of the indirect evaporation heat exchanger, the spray water collecting tray is arranged below the side of the external circulation air inlet of the indirect evaporation heat exchanger and used for collecting spray water flowing down from the external circulation channel of the indirect evaporation heat exchanger, and the spray water collecting tray is connected with the spray water storage tank through a pipeline; the wet film circulating water pump, the water distributor, the wet film circulating water collecting tray and the wet film circulating water storage tank form a wet film circulating water system together, and the spray water pump, the surface air cooler, the spray module, the indirect evaporation heat exchanger, the spray water collecting tray and the spray water storage tank form a spray circulating water system together.
Preferably, the indirect evaporative air cooling device further comprises a sedimentation sewage draining device, a water inlet of the sedimentation sewage draining device is connected with the wet membrane circulating water collecting tray, and a water outlet of the sedimentation sewage draining device is connected with the wet membrane circulating water storage tank; the sedimentation sewage discharge device is provided with a sewage discharge valve.
Preferably, the indirect evaporative air cooling device further comprises a chilled water cooling unit, the chilled water cooling unit is arranged in the internal circulation channel of the indirect evaporative air cooling device, and the chilled water cooling unit is positioned between the indirect evaporative heat exchanger and the internal circulation fan; the freezing water cooling unit is formed by connecting the freezing water meter cooler water inlet, the check valve and the freezing water circulating pump in sequence through pipelines, the freezing water meter cooler water inlet is connected with an external freezing water supply pipeline through a pipeline, and the freezing water meter cooler water outlet is connected with an external freezing water return pipeline through a pipeline.
Preferably, the indirect evaporative air cooling device further comprises a mechanical refrigeration unit, a condensation heat-dissipation air outlet, a condensation heat-dissipation air inlet valve and a condenser spraying module, wherein the mechanical refrigeration unit comprises a compressor, an evaporator, a condenser and a condenser fan, the evaporator is positioned in the internal circulation channel, the evaporator is positioned between the indirect evaporative heat exchanger and the internal circulation fan, and an evaporative condensation module consisting of the condenser, the condenser spraying module and the condenser fan is connected with the external circulation air inlet, the surface air cooler and the wet film through the condensation heat-dissipation air inlet valve.
Preferably, the indirect evaporative air cooling device further comprises an air mixing air valve, and the air mixing air valve is located between the external circulation air inlet and the external circulation air outlet of the indirect evaporative heat exchanger.
Preferably, the indirect evaporation heat exchanger comprises an internal circulation air guide groove module, an external circulation air guide groove module and a dividing wall type heat exchanger, the dividing wall type heat exchanger comprises heat exchanger internal circulation air channels and heat exchanger external circulation air channels which are separated by heat conduction materials to form staggered arrangement, and the heat conduction materials are usually aluminum plates or heat conduction high polymer materials; one end of the internal circulation air guide groove module is connected with the internal circulation air channel of the heat exchanger, and the other end of the external circulation air guide groove module is connected with the external circulation air channel of the heat exchanger.
Preferably, the external circulation fan, the internal circulation fan and the condenser fan are EC centrifugal fans.
Preferably, the chilled water circulating pump is a high-speed EC centrifugal water pump, and the highest rotating speed can reach 4000-10000 r/min.
Compared with the prior art, the beneficial effects of the utility model reside in that: the surface cooler and the wet film are arranged to pre-cool, humidify and wash the external air to obtain pure low-temperature air with the temperature lower than the temperature of an external air wet bulb, so that the efficiency of indirect evaporation is improved, the system can keep high cleanliness for a long time, and the system does not need to be cleaned; by arranging the wet film circulating water system and the spraying circulating water system, the spraying circulating water system is not in direct contact with the external air, so that a pollution source is avoided, and the problem of blockage of a spraying module is avoided; the circulating water with the temperature lower than the outdoor wet bulb temperature is obtained by precooling and humidifying the outdoor air, the heated circulating water is sprayed above the heat exchanger, the evaporative cooling efficiency can be improved, the temperature of the external air subjected to precooling and humidifying is lower than the temperature of the external air wet bulb, the hot return air of the internal circulation can be cooled to a lower temperature, and the temperature can be reduced to approach the dew point temperature of the outdoor air under low load; like this, in the summer time period in most areas in the north, when control supply air temperature 23 ℃, can shorten the operating time that needs mechanical refrigeration to carry out the secondary cooling to in a month, when the regional air inlet temperature of server rack air inlet sets for summer high temperature period and is not higher than 27 +/-2 ℃, just can not need mechanical refrigeration throughout the year, the energy consumption in summer high temperature period will show and reduce.
Drawings
FIG. 1 is a schematic view of a first embodiment of an indirect evaporative air cooling apparatus of the present invention;
FIG. 2 is a schematic view of a second embodiment of an indirect evaporative air cooling apparatus of the present invention;
FIG. 3 is a schematic view of a third embodiment of an indirect evaporative air cooling unit of the present invention;
fig. 4 is a schematic view of an indirect evaporative heat exchanger according to the present invention;
11. an external circulation air inlet; 12. a surface cooler; 131. wet film forming; 132. a wet film circulating water collecting tray; 133. a spray water collection tray; 14. a water distributor; 15. a mixed air valve; 16. an indirect evaporative heat exchanger; 161. an internal circulation air guide groove module; 162. an external circulation air guide groove module; 163. a dividing wall type heat exchanger; 1631. a circulating air duct in the heat exchanger; 1632. an external circulation air duct of the heat exchanger; 17. a spraying module; 18. an external circulation fan; 19. an external circulation air outlet; 21. an internal circulation air inlet; 22. an internal circulation fan; 23. an internal circulation air outlet; 24. a refrigerated water cooler; 25. a sedimentation sewage draining device; 26. a check valve; 27. a chilled water circulating water pump; 31. a wet film circulating water pump; 32. the wet film circulation is a water storage tank; 33. a water collection tank; 34. a spray water pump; 35. a condenser; 36. a condenser fan; 37. a condenser spray module; 38. an evaporator; 39. a condensation heat-dissipation air outlet; 40. a condensation heat dissipation air inlet valve; 41. a spray water storage tank.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The 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.
The first implementation example is as follows:
as shown in fig. 1, fig. 1 is a schematic diagram of an embodiment of the indirect evaporative air cooling device in the present invention, which includes an external circulation air inlet 11, a surface air cooler 12, a wet film 131, a water distributor 14, an indirect evaporative heat exchanger 16, a spray module 17, an external circulation fan 18, an external circulation air outlet 19, an internal circulation air inlet 21, an internal circulation fan 22, an internal circulation air outlet 23, a wet film circulation water pump 31, a spray water pump 34, a spray water storage tank 41, a wet film circulation water storage tank 32, a wet film circulation water collection tray 132, a spray water collection tray 133, a return air temperature and humidity sensor, a heat exchanger temperature sensor and a controller, in this embodiment, in order to make the structural space of the indirect evaporative air cooling device more compact, preferably, the external circulation fan 18 and the internal circulation fan 22 are EC centrifugal fans.
The connections for the entire water delivery system configuration are as follows:
a water inlet of the wet film circulating water pump is connected with a wet film circulating water storage tank through a pipeline, a water outlet of the wet film circulating water pump is connected with a water distributor through a pipeline, the water distributor is arranged at the upper end of the wet film, the water distributor drenches the wet film, and a wet film circulating water collecting tray is positioned below the wet film; a water inlet of the spray water pump is connected with the spray water storage tank through a pipeline, a water outlet of the spray water pump is connected with a water inlet of the surface cooler through a pipeline, a water outlet of the surface cooler is connected with a spray module through a pipeline, and the spray module is positioned above the side, close to the port of the external circulation fan, in the indirect evaporation heat exchanger; the port of the indirect evaporation heat exchanger close to the internal circulation fan is provided with a water collecting tank 33, spray water flowing down from the external circulation channel is collected in the water collecting tank, a wet film circulating water collecting tray and a spray water collecting tray are respectively connected with circulating water flowing down from a wet film and spray water flowing out from the water collecting tank, and the wet film circulating water collecting tray and the spray water collecting tray are respectively connected with a wet film circulating water storage tank and a spray water storage tank through pipelines; the wet film circulating water pump, the water distributor, the wet film circulating water collecting tray and the wet film circulating water storage tank form a wet film circulating water system together, and the spray water pump, the surface air cooler, the spray module, the indirect evaporation heat exchanger, the water collecting tank, the spray water collecting tray and the spray water storage tank form a spray circulating water system together.
In order to control the water amount of the conveying water more accurately, in the present embodiment, the wet film circulating water pump 31 and the spray water pump are preferably variable frequency water pumps, which can intelligently control the water pumping and water conveying flow rate of the wet film circulating water pump. The water feeding and returning process of the wet film circulating water pump is as follows: the wet film circulating water pump 31 is started, the wet film circulating water pump 31 pumps water from the wet film circulating water storage tank 32, the wet film circulating water pump pumps water from the wet film circulating water storage tank and sends the water to the water distributor 14, the wet film 131 is drenched, and the water is recovered through the wet film circulating water collection tray 132 and flows back to the water storage tank 32.
Spray pump extracts the shower from the shower water storage box and sends to surface cooler 12, the water in the surface cooler 12 is through the outdoor air heat transfer, the temperature risees, the shower is sent to spray module 17, spray to indirect evaporation heat exchanger, flow to the shower water header tray through water catch bowl 33, the shower water header tray flows to the shower water storage box through the water pipe, of course, because the water yield has in the circulation to reduce to air humidification and self heat absorption evaporation, in this embodiment, automatic water supply mechanism carries out the moisturizing balance in addition.
In order to discharge impurities contained in the circulating water in the wet film in time, in this embodiment, preferably, the indirect evaporative air cooling device further includes a sedimentation sewage draining device 25, the sedimentation sewage draining device 25 is disposed between the wet film circulating water collecting tray 132 and the wet film circulating water storage tank or disposed inside the wet film circulating water storage tank, a water inlet of the sedimentation sewage draining device is connected with the wet film circulating water collecting tray, a water outlet of the sedimentation sewage draining device is connected with the wet film circulating water storage tank, the circulating water flows out of the wet film circulating water collecting tray into the sedimentation sewage draining device, sludge is deposited in the sedimentation sewage draining 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.
The wet film circulating water system and the spraying circulating water system are independent of 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 not polluted by the outside, so that the problem that a spray module nozzle is blocked is avoided.
The connection for the entire air circulation system configuration is as follows:
an internal circulation air inlet 21, an indirect evaporation heat exchanger 16, an internal circulation fan 22 and an internal circulation air outlet 23 are sequentially connected together to form an internal circulation channel, an external circulation air inlet 11, a surface air cooler 12, a wet film 131, a1 water distributor 14, a spraying mold 17, the indirect evaporation heat exchanger 16, an external circulation fan 18 and an external circulation air outlet 19 are sequentially connected together to form a natural air-cooled external circulation channel, when the indirect evaporation air cooling device works, indoor hot air enters the internal circulation channel from the internal circulation air inlet, is cooled on the surface of the indirect evaporation heat exchanger and then is blown into a room through the internal circulation fan and the internal circulation air outlet, outdoor air enters the external circulation channel from the external circulation air inlet, enters the wet film after being cooled through the surface air cooler, is humidified and cooled on the surface of the wet film, then enters the indirect evaporation heat exchanger, and carries out evaporative cooling heat transfer and other processes on, the internal circulation hot air is cooled, and the heated outdoor air is blown out of the external circulation air outlet through the external circulation fan; indoor hot air is subjected to heat exchange, cooling and circulation in the inner circulation channel, outdoor air is discharged after being subjected to heat exchange and temperature rise in the natural air cooling outer circulation channel, only the outdoor air serves as a cold source in the whole cooling process, and heat exchange, cooling and cooling are carried out on the indoor hot air. In this embodiment, the outdoor air refers to air entering the room through the external circulation air inlet, and the indoor hot air refers to air entering the room through the internal circulation air inlet.
The air return temperature and humidity sensor is located near the inner circulation air inlet, the heat exchanger temperature sensor is located in the inner circulation channel and specifically located between the indirect evaporation heat exchanger and the inner circulation fan, the air return temperature and humidity sensor and the heat exchanger temperature sensor are electrically connected with a controller of the air conditioner, the air speed of the inner circulation fan is controlled through the air return temperature detected by the air return temperature and humidity sensor, the air return temperature is stably kept at a set value, the air speed of the outer circulation fan is controlled through the air supply temperature detected by the heat exchanger temperature sensor, and the water spray quantity of the spray module is controlled, so that the air supply temperature is stably kept at the set value.
As for the structure of the indirect evaporation heat exchanger 16, specifically, as shown in fig. 4, the indirect evaporation heat exchanger 16 includes an internal circulation air guiding slot module 161, an external circulation air guiding slot module 162 and a dividing wall type heat exchanger 163, the dividing wall type heat exchanger 163 is isolated by a heat conducting material, which is usually an aluminum plate or a heat conducting polymer material, to form staggered heat exchanger internal circulation air ducts 1631 and heat exchanger external circulation air ducts 1632; the internal circulation air guide groove module 161 is connected with a heat exchanger internal circulation air duct 1631 at an air opening at one end of the dividing wall type heat exchanger, and the external circulation air guide groove module 162 is connected with a heat exchanger external circulation air duct 1632 at an air opening at the other end of the dividing wall type heat exchanger, so that indoor hot air and outdoor air respectively enter the dividing wall type heat exchanger through the internal circulation air guide groove module 161 and the external circulation air guide groove module 162, and flow in the heat exchanger internal circulation air duct 1631 and the heat exchanger external circulation air duct 1632 in a 180-degree opposite direction in a counter-flow mode. The heat exchange efficiency of indoor hot air and outdoor air is improved by the counter-flow flowing mode.
As shown in fig. 1, the direction indicated by the arrow B-B in fig. 1 is the direction of the indoor hot air circulating in the internal circulation channel, the internal circulation fan 22 is started, the indoor hot air is guided into the heat exchanger internal circulation air duct 1631 through the internal circulation air inlet 21 and the internal circulation air guide slot module 161, exchanges heat with the outdoor air in the heat exchanger external circulation air duct 1632, the indoor air is cooled to become cold air, and the cold air is discharged from the indirect evaporation heat exchanger 16 and then is sent out through the internal circulation fan 22 and the internal circulation air outlet 23. The direction marked by the arrow a-a1 in fig. 1 is the direction of the outdoor air circulating in the natural air-cooling external circulation channel, the external circulation fan 18 is started, the outdoor air is guided into the air conditioner through the external circulation air inlet 11, and is sequentially precooled and cooled and humidified by the surface air cooler 12 inside the air conditioner, and then guided into the heat exchanger external circulation air duct 1632 through the external circulation air guide groove module 162, and exchanges heat with the indoor hot air in the heat exchanger internal circulation air duct 1631, the outdoor air is heated to become hot air, and the hot air comes out from the indirect evaporation heat exchanger channel and is sent out through the external circulation fan 18 and the external circulation air outlet 19. In order to make the cooling effect of the outdoor air through the surface air cooler better, in this embodiment, preferably, the surface air cooler 12 is a fin-type surface air cooler, the fins are vertically connected with the surface air cooler, and the air inlet direction of the outdoor air is parallel to the fins and is perpendicular to the surface air cooler, so that the contact area between the natural air and the surface air cooler can be increased, and the pre-cooling effect is better. When outdoor air and indoor hot air exchange heat in the indirect evaporation heat exchanger, the spraying module 17 in the natural air cooling external circulation channel sprays water to the inside of the heat exchanger external circulation air duct 1632, the spraying module 17 is located at the side of the port close to the external circulation air outlet 19 in the indirect evaporation heat exchanger 16, and the water flows to the other end from one end of the heat exchanger external circulation air duct 1632 along the direction opposite to the direction of the outdoor air circulation flow in the heat exchanger external circulation air duct 1632. Through spraying water in heat exchanger extrinsic cycle wind channel 1632 like this, when the heat transfer of indoor air and outdoor air, can also cool down through the direct evaporation of the water in heat exchanger extrinsic cycle wind channel 1632 for the heat transfer effect further promotes.
A complete outdoor air circulation process in this embodiment is as follows: the outdoor air enters the heat exchanger external circulation air duct of the indirect evaporation heat exchanger after being precooled by the surface cooler and humidified by the wet film, exchanges heat with the indoor hot gas and is sent out of the room by the external circulation fan.
A complete indoor air circulation process is such that: the indoor hot air enters the heat exchanger internal circulation air duct in the indirect evaporation heat exchanger through the internal circulation air inlet to exchange heat with outdoor air, and the indoor air is cooled by the evaporator and is sent into the room by the internal circulation fan 61.
The heat exchange flow principle of the whole cooling device is as follows: outdoor air is precooled and humidified by a surface cooler and a wet film in sequence, the outdoor air at the moment is cold air with the temperature close to a wet bulb and enters an external circulation air channel of a heat exchanger through an external circulation air channel of the heat exchanger, meanwhile, indoor hot air enters the internal circulation air channel of the heat exchanger from the internal circulation air channel of the heat exchanger, the internal circulation air channel of the heat exchanger and the external circulation air channel of the heat exchanger are 180 degrees, the flow directions of the indoor hot air and the outdoor air are opposite, the indoor hot air in the internal circulation air channel of the heat exchanger and the outdoor air in the external circulation air channel of the heat exchanger are in opposite countercurrent heat exchange, the outdoor air is evaporated and absorbs heat, the indoor air dissipates heat and cools, a spray module sprays water to the external circulation air channel of the heat exchanger at an air outlet end of the external circulation air channel of the heat exchanger, the sprayed water is slightly heated water absorbed by, the water with higher water temperature absorbs heat and evaporates more quickly, and the indoor hot air in the internal circulation air duct of the heat exchanger dissipates heat and cools down quickly.
In order to solve the problem, in the embodiment, an air mixing air valve 15 is arranged between an external circulation air inlet and an external circulation air outlet, the air mixing air valve 15 is opened, an external circulation air inlet 11 and an external circulation air outlet 19 are communicated in a cross-air mode, the air mixing air valve 15 is closed, the external circulation air inlet 11 and the external circulation air outlet 19 are sealed and isolated, so that when the temperature reaches below a preset temperature, the air mixing control air valve is controlled to be opened, hot air at the external circulation air outlet is mixed into cold air at the external circulation air inlet, the temperature of the cold air reaches above 0 ℃, and the problem of frosting and icing in winter is solved.
The steps of the implementation process of the operation function of the indirect evaporative air cooling device are described in detail below by taking Shenzhen summer outdoor air with 35 ℃ and 27.5 ℃ as examples:
outdoor air with the external temperature of 35 ℃ and the relative humidity of 56 percent is pre-cooled by a pre-cooling surface air cooler with the external temperature of 28 ℃ to generate an equal-humidity cooling process, air with the temperature of 31 ℃ and the relative humidity of 75 percent can be obtained at the lowest by controlling the water speed and the air intake volume of the pre-cooling surface air cooler, the outdoor 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 distributed on the wet film by circulating water in a circulating water storage tank of the wet film, the outdoor air with the temperature of 31 ℃ and the relative humidity of 75 percent is subjected to convective evaporation with a water curtain of the wet film with the temperature of 28 ℃ after pre-cooling, the outdoor air is humidified and cooled, the relative humidity is humidified to be close to 100 percent above 96 percent by controlling the flow rate of the water curtain, the air inlet speed and the convective contact area, the outdoor air temperature is reduced to the wet bulb temperature of 27., the indoor hot air is changed into air with the temperature of 28 ℃ after heat exchange and is sent to the room; after the spray water at 28 ℃ in the precooling surface cooler exchanges heat with air at 35 ℃, the water temperature is raised to 29 ℃, the spray water at 29 ℃ sprays in an external circulation air duct of the heat exchanger, and the spray water is changed into water at 28 ℃ after the heat exchange temperature is raised and then falls into a spray water storage tank.
Contrast indirect evaporative air cooling device without precooling surface cooler:
outdoor air with the external temperature of 35 ℃ and the relative humidity of 56% directly enters the wet film, is subjected to convective evaporation with a water curtain at 28 ℃ in the wet film to generate an isenthalpic humidification process, and is subjected to heat exchange with indoor hot air in a heat exchanger internal circulation air channel after being conveyed to an external circulation air channel of the heat exchanger and being subjected to heat exchange with the indoor hot air in the heat exchanger internal circulation air channel by controlling the falling flow rate, the air inlet speed and the convective contact area of the water curtain, wherein the outdoor air temperature is reduced to 29 +/-0.5 ℃ and the relative humidity of the air is 88%; after the spray water at 28 ℃ in the precooling surface cooler exchanges heat with air at 35 ℃, the water temperature is raised to 29 ℃, the spray water at 29 ℃ sprays in an external circulation air duct of the heat exchanger, and the spray water is changed into water at 29.5 ℃ after the heat exchange temperature is raised and then is dropped into a spray water storage tank.
Compared with the prior art, the air inlet is precooled by the precooling surface air cooler after the air is fed into the air inlet, the air temperature is reduced, the humidity is increased, the temperature of the corresponding wet bulb is reduced, and cold air with lower temperature can be obtained by controlling the air speed of the fan, the flow rate of the wet film circulating water and the contact area of the air and the water. The heat exchange of the indoor air can reduce the temperature of the indoor air by about 1.5 ℃ and reduce the power consumption by about 15%.
This embodiment utilizes outdoor air as the cold source, through the precooling humidification for cold volume of cold source increases, and the further humidification of reuse shower water is as additional cold source in the heat transfer, makes the cold source sufficient, and indoor air cooling effect is obvious.
The utility model discloses a setting up surface cooler and wet membrane to outside air precooling humidification washing obtain the pure low temperature air that is less than outside air wet bulb temperature, improved the efficiency of indirect evaporation, can make the system keep higher cleanliness factor for a long time, do not need to wash; by arranging the wet film circulating water system and the spraying circulating water system, the spraying circulating water system is not in direct contact with the external air, so that a pollution source is avoided, and the problem of blockage of a spraying module is avoided; the circulating water with the temperature lower than the outdoor wet bulb temperature is obtained by precooling and humidifying the outdoor air, the heated circulating water is sprayed above the heat exchanger, the evaporative cooling efficiency can be improved, the temperature of the external air subjected to precooling and humidifying is lower than the temperature of the external air wet bulb, the hot return air of the internal circulation can be cooled to a lower temperature, and the temperature can be reduced to approach the dew point temperature of the outdoor air under low load; like this, in the summer time period in most areas in the north, when control supply air temperature 23 ℃, can shorten the operating time that needs mechanical refrigeration to carry out the secondary cooling to in a month, when the regional air inlet temperature of server rack air inlet sets for summer high temperature period and is not higher than 27 +/-2 ℃, just can not need mechanical refrigeration throughout the year, the energy consumption in summer high temperature period will show and reduce.
Example two was performed:
due to seasonal variation, the outdoor air temperature also changes, in spring and autumn and winter, the outdoor air temperature is usually below 28 ℃, in summer, the outdoor air temperature is usually above 28 ℃, sometimes even exceeds 35 ℃, at this time, the outdoor air is used as a cold source, the cooling effect is very low, the heat dissipation requirement of a data center machine room cannot be stably met, and a new cold source is needed for secondary cooling. The second embodiment is an improvement on the first embodiment.
Compared with the first embodiment, the difference between the second embodiment and the first embodiment is that the indirect evaporative air cooling device further includes a mechanical refrigeration unit, a condensation heat dissipation air outlet 39, a condensation heat dissipation air inlet valve 40, and a condenser spray module 37, as shown in fig. 2, specifically, the mechanical refrigeration unit includes a compressor, an evaporator 38, a condenser 35, and a condenser fan 36, and in order to make the mechanical unit more compact in structure and intelligently control the air volume, the condenser fan is preferably an EC centrifugal fan. The compressor, the evaporator 38 and the condenser 35 form a refrigeration system through a capillary copper pipe and a throttling device, and a mechanical refrigeration cold source is provided for the air conditioner. In the indirect evaporative air cooling device, an evaporator 38 is positioned between an indirect evaporative heat exchanger 16 and an internal circulation fan 22, the evaporator 38 is connected with an internal circulation air inlet 21, the indirect evaporative heat exchanger 16, the internal circulation fan 22 and an internal circulation air outlet 23 to form a secondary cooling internal circulation channel, a condenser spraying module and a condenser fan form an evaporative condensation module, and the evaporative condensation module and a condensation heat-dissipation air outlet 39 are connected with an external circulation air inlet 11, a surface air cooler 12 and a wet film 131 through a condensation heat-dissipation air inlet valve 40 to form a condensation heat-dissipation external circulation channel. The condenser spraying module is connected with the water outlet of the wet film circulating water pump, and the condenser fan 36 is positioned in front of or behind the condenser 35.
The direction marked by the arrow B-B in FIG. 2 is the direction of the indoor hot air circulating flow in the secondary cooling internal circulation channel, the internal circulation fan is started, the indoor hot air is guided by the internal circulation air inlet through the internal circulation air guide groove module to enter the internal circulation air channel of the heat exchanger, after exchanging heat with the outdoor air in the external circulation air channel of the heat exchanger, the outdoor air is cooled to become cold air, the cold air comes out from the indirect evaporation heat exchanger, is secondarily cooled by the evaporator, and is sent out through the internal circulation fan and the internal circulation air outlet; the direction marked by the arrow A-A1 in fig. 2 is the direction of the outdoor air circulating in the natural air-cooling external circulation channel, the external circulation fan is started, the outdoor air enters the air conditioner through the external circulation air inlet, and is sequentially precooled and cooled by the surface cooler in the air conditioner, humidified by the humidity of the wet film, guided by the internal circulation air guide groove module to enter the external circulation air channel of the heat exchanger, and exchanges heat with the indoor hot air in the internal circulation air channel of the heat exchanger, the outdoor air is heated to become hot air, and the hot air comes out from the indirect evaporation heat exchanger channel and is sent out through the external circulation fan and the external circulation air outlet. The direction marked by the arrow A-A2 in fig. 2 is the natural wind circulation flowing direction of the condensation heat dissipation outer circulation channel, the outer circulation fan is started, outdoor air enters the air conditioner through the outer circulation air inlet, and is sequentially precooled and cooled by the surface cooler in the air conditioner and humidified by the humidity of the wet film, the condensation heat dissipation air inlet valve is opened, the humidified wet cold air enters the condensation heat dissipation air inlet channel through the condensation heat dissipation air inlet valve to cool the condenser in a heat dissipation manner, and the air is discharged through the condenser fan and the condensation heat dissipation air outlet. At the moment, the condenser spraying module sprays the condenser, the condenser is subjected to evaporative cooling, in the implementation example, after outdoor air is pre-cooled and humidified, one path of outdoor air enters the heat exchanger external circulation air channel to exchange heat with indoor hot air in the heat exchanger internal circulation air channel, the other path of outdoor air enters the condensation heat dissipation external circulation channel to exchange heat with the condenser, the condenser is subjected to heat dissipation and cooling, meanwhile, the condenser spraying module sprays the condenser for evaporative cooling, the heat dissipation pressure of the condenser is reduced, and the power consumption of mechanical refrigeration is greatly reduced.
A complete condenser cooling gas cycle is such that: outdoor air enters the condensation heat dissipation outer circulation channel after being precooled by the surface cooler and humidified by the wet film mold, exchanges heat with the condenser, and is sent out of the room by the condenser fan after heat exchange. Generally, the outdoor air passes through the wet film and then is reduced in temperature to become low-temperature outdoor air, so that the working temperature of the condenser of the embodiment is lower than that of the outdoor air, and the mechanical refrigeration can obtain better refrigeration effect.
For example, the internal circulation return air temperature of a certain data center is 35 ℃, and the indoor supply air temperature to be controlled is 23 ℃. In summer, when the outside air temperature is 37 ℃ and the relative humidity is 50% (at 28 ℃ of wet bulb temperature), the internal circulation return air cannot be cooled to the expected 23 ℃ only by indirect evaporative cooling, and the compressor is required to work for secondary cooling. The specific working process is as follows: when the outdoor air enters the natural air cooling external circulation channel of the indirect evaporative air cooling device, the relative humidity is close to 100 percent after the outdoor air is humidified by the wet film, the gas temperature is close to 28 ℃, and the outdoor air temperature is raised to 34.3 ℃ after the outdoor air passes through the indirect evaporative heat exchanger. In a natural air cooling external circulation channel, indoor air at 35 ℃ is cooled to 28.7 ℃ after passing through an indirect evaporation heat exchanger, and then is cooled to 23 ℃ after secondary cooling through an evaporator, the relative refrigerating capacity obtained through the indirect evaporation heat exchanger in the process is approximate to (28.7 ℃ at 35 ℃)/(23 ℃ at 35 ℃) 52.5%, namely the indirect evaporation cooling bears 52.5% of the total refrigerating load of the data center, the refrigerating capacity required by mechanical refrigeration is only 47.5%, and the energy efficiency ratio of an inverter compressor under the working condition is much higher than the full load. In addition, when the external air temperature is 30 ℃ and the relative humidity is 40%, the wet bulb temperature is 20 ℃, when the external air passes through the indirect evaporative air cooling device, the humidifying relative humidity passing through the wet film is close to 100%, the temperature is close to 20 ℃, after passing through the indirect evaporative heat exchanger, the outdoor air temperature is 33.5 ℃, the indoor air temperature is 35 ℃, the temperature after passing through the indirect evaporative heat exchanger can reach 21.5 ℃, namely the cooling requirement on the indoor air can be met through the indirect evaporative cooling under the condition, and the compressor can not work.
Example three was performed:
the natural wind temperature changes along with seasonal changes, in spring and autumn and winter, the temperature of outdoor air is usually below 28 ℃, in summer, the temperature of natural wind is usually above 28 ℃, sometimes even exceeds 35 ℃, at this time, the outdoor air is used as a cold source, the cooling effect is very low, the heat dissipation requirement of a data center machine room cannot be stably met, and a new cold source is needed for secondary cooling. The third embodiment is an improvement on the first embodiment.
Compared with the first implementation example, as shown in fig. 3, the third implementation example is different from the first implementation example in that the indirect evaporation precise air conditioner further comprises a chilled water cooling unit, the chilled water cooling unit is arranged in an internal circulation channel of the indirect evaporation air cooling device, and the chilled water cooling unit is located between the indirect evaporation heat exchanger and the internal circulation fan; specifically, the chilled water cooling unit is formed by sequentially connecting a chilled water inlet, a chilled water cooler 24, a chilled water circulating pump 27, a check valve 26 and a chilled water outlet through pipelines, the chilled water cooler 24 is connected with an internal circulation air inlet 21, an indirect evaporation heat exchanger 16, an internal circulation fan 22 and an internal circulation air outlet 23 to form a secondary cooling internal circulation channel, the chilled water inlet is connected with an external chilled water supply pipeline through a pipeline, and the chilled water cooler water outlet is connected with an external chilled water return pipeline through a pipeline. Preferably, the chilled water circulating pump is a high-speed EC centrifugal water pump, and the rotating speed can reach 4000-. Because the rotational speed is much higher than ordinary pump, compare ordinary centrifugal pump and be more steady than electric control valve in the aspect of flow control, no flow step phenomenon, terminal temperature fluctuation is little. The chilled water circulating pump can continuously adjust the flow of chilled water in a stepless way through the controller, thereby precisely adjusting the air outlet temperature of the indirect evaporative air cooling device.
As shown in fig. 3, the direction indicated by the arrow B-B in fig. 3 is the direction of the indoor air circulating in the secondary cooling internal circulation channel, the internal circulation fan is started, the indoor air is guided into the internal circulation air channel of the heat exchanger through the internal circulation air inlet and the internal circulation air guide channel module, exchanges heat with the outdoor air in the external circulation air channel of the heat exchanger, the indoor air is cooled to become cold air, the cold air comes out from the indirect evaporation heat exchanger, is cooled secondarily by the chilled water cooler, and is sent out through the internal circulation fan and the internal circulation air outlet; the direction marked by the arrow A-A1 in FIG. 3 is the direction of the outdoor air circulating in the natural air-cooled external circulation channel, the external circulation fan is started, the outdoor air enters the air conditioner through the external circulation air inlet, and is sequentially precooled and cooled and humidified by the surface cooler inside the air conditioner, and then enters the external circulation air channel of the heat exchanger through the external circulation air guide groove module, and after exchanging heat with the indoor air in the internal circulation air channel of the heat exchanger, the outdoor air is heated to become hot air, and the hot air comes out from the indirect evaporation heat exchanger channel and is sent out through the external circulation fan and the external circulation air outlet. In this embodiment, the outdoor air is pre-cooled and humidified to enter the heat exchanger external circulation air duct and exchange heat with the indoor air in the heat exchanger internal circulation air duct, and after heat exchange, the secondary cooling is performed through the water chiller of the freezing water, so that the hot air is effectively cooled.
The utility model can cool and humidify the outdoor air to make the outdoor air reach the wet bulb temperature, and exchange heat with the hot air, thereby obviously improving the cooling temperature range of the hot air; the cold source end is sprayed with water in the heat exchange process to serve as an additional cold source for humidification and cooling, so that the cold source is more sufficient, and the heat control heat exchange is uniform and continuous; the requirement of cooling hot air in the high-temperature period in summer is met through mechanical refrigeration and secondary cooling; the condenser is cooled by precooling and humidifying natural wind, so that the condensing pressure of the condenser is greatly reduced.
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 represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. An indirect evaporative air cooling apparatus, comprising:
the indirect evaporative air cooling device comprises an external circulation air inlet, a surface cooler, a wet film, a water distributor, an indirect evaporative heat exchanger, a spraying module, an external circulation fan, an external circulation air outlet, an internal circulation air inlet, an internal circulation fan, an internal circulation air outlet, a wet film circulating water pump, a spraying water pump, a wet film circulating water collecting tray, a spraying water collecting tray, a wet film circulating water storage tank, a spraying water storage tank, a return air temperature and humidity sensor, a heat exchange temperature sensor and a controller;
the internal circulation air inlet, the indirect evaporation heat exchanger, the internal circulation fan and the internal circulation air outlet are sequentially connected together to form an internal circulation channel, and the external circulation air inlet, the surface air cooler, the wet film, the indirect evaporation heat exchanger, the spraying module, the external circulation fan and the external circulation air outlet are sequentially connected together to form a natural air-cooled external circulation channel; the return air temperature and humidity sensor is positioned near the internal circulation air inlet, and the heat exchange temperature sensor is positioned in the internal circulation channel and between the indirect evaporation heat exchanger and the internal circulation fan;
the wet film circulating water pump inlet is connected with the wet film circulating water storage tank through a pipeline, the wet film circulating water pump outlet is connected with the water distributor through a pipeline, the water distributor is arranged at the upper end of the wet film, the water distributor sprays the wet film, the wet film circulating water collecting tray is positioned below the wet film and used for collecting wet film circulating water flowing down from the wet film, and the wet film circulating water collecting tray is connected with the wet film circulating water storage tank through a pipeline; the spray water inlet is connected with the spray water storage tank through a pipeline, the spray water outlet is connected with the water inlet of the surface cooler through a pipeline, the water outlet of the surface cooler is connected with the spray module through a pipeline, the spray module is positioned above the side, close to the external circulation air outlet of the external circulation fan, of the indirect evaporation heat exchanger, the spray water collecting tray is arranged below the side, close to the external circulation air inlet, of the indirect evaporation heat exchanger and used for collecting spray water flowing down from the external circulation channel of the indirect evaporation heat exchanger, and the spray water collecting tray is connected with the spray water storage tank through a pipeline; the wet film circulating water pump, the water distributor, the wet film circulating water collecting tray and the wet film circulating water storage tank form a wet film circulating water system together, and the spray water pump, the surface air cooler, the spray module, the indirect evaporation heat exchanger, the spray water collecting tray and the spray water storage tank form a spray circulating water system together.
2. The indirect evaporative air cooling device of claim 1, wherein: the indirect evaporative air cooling device further comprises a sedimentation sewage draining device, the water inlet of the sedimentation sewage draining device is connected with the wet film circulating water collecting tray, the water outlet of the sedimentation sewage draining device is connected with the wet film circulating water storage tank, and the sedimentation sewage draining device is provided with a sewage draining valve.
3. The indirect evaporative air cooling device of claim 1, wherein:
the indirect evaporative air cooling device further comprises a chilled water cooling unit, the chilled water cooling unit is arranged in the internal circulation channel of the indirect evaporative air cooling device, and the chilled water cooling unit is positioned between the indirect evaporative heat exchanger and the internal circulation fan; the freezing water cooling unit is formed by connecting freezing water inlet, freezing water circulating pump, check valve, freezing water meter cooler, freezing water delivery port in proper order through the pipeline, the freezing water inlet passes through the outside freezing water supply pipe of pipe connection, the freezing water delivery port passes through the outside freezing water return water pipeline of pipe connection.
4. The indirect evaporative air cooling device of claim 1, wherein:
the indirect evaporative air cooling device further comprises a mechanical refrigeration unit, a condensation heat-dissipation air outlet, a condensation heat-dissipation air inlet valve and a condenser spraying module, wherein the mechanical refrigeration unit comprises a compressor, an evaporator, a condenser and a condenser fan, the evaporator is positioned in the inner circulation channel, the evaporator is positioned between the indirect evaporative heat exchanger and the inner circulation fan, and the condenser spraying module and the evaporative condensation module consisting of the condenser fan are connected with the outer circulation air inlet, the surface cooler and the wet film through the condensation heat-dissipation air inlet valve.
5. The indirect evaporative air cooling device of claim 1, wherein:
the indirect evaporative air cooling device further comprises an air mixing air valve, and the air mixing air valve is located between the external circulation air inlet and the external circulation air outlet of the indirect evaporative heat exchanger.
6. The indirect evaporative air cooling device of any one of claims 1 to 5, wherein:
the indirect evaporation heat exchanger comprises an internal circulation air guide groove module, an external circulation air guide groove module and a dividing wall type heat exchanger, wherein the dividing wall type heat exchanger is isolated by a heat conduction material to form a heat exchanger internal circulation air channel and a heat exchanger external circulation air channel which are arranged in a staggered mode, and the heat conduction material is an aluminum plate or a heat conduction high polymer material; one end of the internal circulation air guide groove module is connected with the internal circulation air channel of the heat exchanger, and the other end of the external circulation air guide groove module is connected with the external circulation air channel of the heat exchanger.
7. The indirect evaporative air cooling device of claim 4, wherein:
the external circulation fan, the internal circulation fan and the condenser fan are EC centrifugal fans.
8. The indirect evaporative air cooling device of claim 3, wherein:
the chilled water circulating pump is a high-speed EC centrifugal water pump, and the highest rotating speed can reach 4000-10000 rpm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459097A (en) * | 2022-02-07 | 2022-05-10 | 北京百度网讯科技有限公司 | Refrigeration system and method |
| KR102517769B1 (en) * | 2022-11-24 | 2023-04-05 | 주식회사 셀빛 | Window integrated ventilation purifier |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114459097A (en) * | 2022-02-07 | 2022-05-10 | 北京百度网讯科技有限公司 | Refrigeration system and method |
| KR102517769B1 (en) * | 2022-11-24 | 2023-04-05 | 주식회사 셀빛 | Window integrated ventilation purifier |
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