CN111023374A - Indirect evaporative fluid cooling device - Google Patents
Indirect evaporative fluid cooling device Download PDFInfo
- Publication number
- CN111023374A CN111023374A CN202010020879.1A CN202010020879A CN111023374A CN 111023374 A CN111023374 A CN 111023374A CN 202010020879 A CN202010020879 A CN 202010020879A CN 111023374 A CN111023374 A CN 111023374A
- Authority
- CN
- China
- Prior art keywords
- air
- water
- heat exchanger
- fluid
- cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
- F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Geometry (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to an indirect evaporative fluid cooling device, which comprises a shell, an air inlet, an air outlet, a fan, a fluid inlet, a water collecting module, a spraying module, an evaporative cooling heat exchanger, a fluid outlet, a wet film, an air cooling surface air cooler, a water collecting tank, a circulating water pump, a water supplementing valve and the like. The air cooling surface cooler is added before the wet film, so that the wet bulb temperature of air entering the wet film is reduced, and the temperature of the air entering the evaporative cooling heat exchanger and the temperature of spray water of the wet film is lower than the temperature of wet bulb of external air; meanwhile, spray water heated by the air cooling surface air cooler is uniformly sprayed on the upper surface of the evaporative cooling heat exchanger, so that the spray water in the air flowing direction is distributed in a gradient manner in a temperature gradient manner, heat exchange between the whole layers of the evaporative cooling heat exchanger is in a countercurrent manner, and falling water is reduced into cold water with the temperature lower than the temperature of an external air wet bulb, so that the water evaporation capacity of the evaporative cooling heat exchanger and the whole evaporative cooling efficiency are greatly improved compared with a scheme without precooling.
Description
Technical Field
The invention relates to the application occasions of a central air-conditioning system, in particular to the field of air-conditioning energy conservation and natural cooling, and particularly relates to a fluid cooling device utilizing indirect evaporation.
Background
At present, the conventional cooling tower mainly adopts an open tower, the water consumption is high, and the temperature of outlet water is higher than the temperature of external air wet bulb, and is generally higher than the temperature of the wet bulb by 2-5 ℃. The conventional closed cooling tower has the advantages of cleanness, water saving, energy saving, capability of directly supplying cold to the tail end and the like, but also has the defects of high cost, large volume, heaviness and the like. The defects are that the conventional closed cooling tower has low efficiency of the tubular heat exchanger, insufficient surface area, uneven water spraying, poor water absorption of the used filler, uneven distribution of a liquid film on the surfaces of the filler and the heat exchanger and small surface area, so that the conventional closed cooling tower has low water evaporation efficiency on the surfaces of the filler and the heat exchanger. The invention adopts the finned tube heat exchanger with large fin surface area and hydrophilic surface, and adopts the high-efficiency evaporation wet film to replace the conventional filler, thus fundamentally solving the problems.
Disclosure of Invention
According to the invention, air is pre-cooled by using the air cooling surface cooler, the cooled air is efficiently evaporated by a wet film to prepare cold air and cold water with the temperature lower than the temperature of an external air wet bulb, and the prepared cold water is recycled to enter the air cooling surface cooler to cool the air; the wet air with the temperature lower than the wet bulb temperature of the outside air prepared in the process enters an evaporative cooling heat exchanger with a water spraying device arranged at the upper part, and the cooled fluid in the evaporative cooling heat exchanger pipe is cooled by cold water and cold air generated in the evaporative cooling process; when flowing down through the evaporative cooling heat exchanger, the spray water heated by the air cooling surface cooler is also gradually cooled and then flows into the wet film to prepare cold water with the temperature lower than the temperature of an external air wet bulb, the cold water enters the water collecting tank and then is conveyed into the air surface cooler, and the circulation is performed to form dynamic balance; the spray water heated by the air cooling surface air cooler is uniformly sprayed on the upper surface of the evaporative cooling heat exchanger, the temperature of the spray water in the evaporative cooling heat exchanger along the air flow direction forms gradient distribution, and the heat exchange of the cooled fluid and the air is in a countercurrent mode between the whole layers of the evaporative cooling heat exchanger, so that after the heat exchange is fully carried out, the spray water falling from the evaporative cooling heat exchanger is reduced into cold water with the temperature lower than the temperature of an external air wet bulb, and then flows into a wet film and enters a water collecting tank. Compared with the mode that air is not precooled or cold water is directly sprayed on the evaporative cooling heat exchanger, the water evaporation capacity and the overall evaporative cooling efficiency of the evaporative cooling heat exchanger are greatly improved.
The evaporative cooling heat exchanger and the fluid precooling surface cooler used in the invention are both fin tube heat exchangers, fins of the fin tube heat exchanger are uniformly distributed and are square, and the air circulation space of the heat exchanger is uniformly divided, so that the air flow flowing through the heat exchanger is uniformly distributed, and meanwhile, the surfaces of the fins are provided with hydrophilic coatings, thus the area of a liquid film is increased; the spray heads of the spray modules are uniformly distributed, and the particle size of sprayed liquid beads is smaller, so that the uniformity of spray water flow distribution is improved; the efficient hydrophilic wet film is adopted, so that the adsorption force of water on the surface of the wet film is increased, the area of a liquid film is increased, and the evaporation efficiency is improved; the air is cooled by utilizing the spray water with the lowest system temperature after filtration, and then the spray water is uniformly sprayed on the evaporative cooling heat exchanger for evaporative heat exchange and then reduced into cold water, the whole designed system forms a closed loop, and the efficiency of the equipment is far higher than the fundamental reason of the conventional closed cooling tower. The device shows strong cooling capacity in practical application, and when the relative humidity of ambient air is not higher than 50% under rated load, the temperature of outlet water is not higher than the temperature of external air wet bulb.
The air precooling surface cooler, the spraying module, the evaporative cooling heat exchanger and the wet film are all obliquely arranged to increase the corresponding windward area and the heat exchange area. The spray heads of the spray modules are uniformly arranged and aligned with the evaporative cooling heat exchanger, and the particle size of sprayed water drops is smaller, so that the evaporative cooling efficiency can be greatly improved; the heat exchanger fins are coated with hydrophilic coatings added with radiation heat dissipation materials for enhancing the heat dissipation effect of heat exchange. When the invention is matched with water-cooling air-conditioning host equipment for use, the condensation pressure of a refrigeration system can be reduced, and the energy efficiency of the refrigeration system is improved; in the transition season, the system can also pre-cool the chilled water or directly supply cold water to a tail end air conditioner, so that the utilization rate of a natural cold source can be greatly improved. The invention has the characteristic of water saving of the closed cooling tower and can greatly reduce water consumption.
The technical scheme of the implementation case of the invention is as follows:
an indirect evaporative fluid cooling device, comprising:
the device comprises a shell, an air inlet, an air outlet, a fan, a fluid inlet, a water collecting module, a spraying module, an evaporative cooling heat exchanger, a fluid outlet, a wet film, an air cooling surface air cooler, a water collecting tank, a circulating water pump and a water supplementing valve;
the fan is arranged at the upper part of the indirect evaporative fluid cooling device, the water receiving module is arranged below the fan, the evaporative cooling heat exchanger is arranged below the water receiving module, the wet film is arranged below the evaporative cooling heat exchanger, the air cooling surface cooler is arranged at the front side or below the air inlet direction of the wet film, and the air cooling surface cooler is communicated with the air inlet;
the fluid inlet, the evaporative cooling heat exchanger and the fluid outlet are connected in sequence through a cooling fluid pipeline;
the spray module is arranged above the evaporative cooling heat exchanger, a plurality of spray heads of the spray module are uniformly distributed above the upper surface of the evaporative cooling heat exchanger, and nozzles of the plurality of spray heads are arranged in alignment with the upper surface of the evaporative cooling heat exchanger;
the water replenishing valve is connected with the water collecting tank; the water collecting tank, the circulating water pump, the air cooling surface air cooler and the spraying module are connected through a spraying water pipeline;
when the circulating water pump operates, spray water in the water collecting tank firstly enters the air cooling surface air cooler through the circulating water pump along the spray water pipeline and then enters the spray module; the sprayed spray water of the spraying module is sprayed on the evaporative cooling heat exchanger, flows down from the evaporative cooling heat exchanger, then flows into the wet film and then flows into the water collecting tank;
when the fan operates, external air enters the air cooling surface air cooler from the air inlet to be cooled, and then enters the wet film to be humidified and cooled; the humidified and cooled external air upwards enters the evaporative cooling heat exchanger for evaporation and heat exchange, then flows through the water receiving module and is sent out by the fan.
The specific technical effects of the invention are as follows:
(1) the indirect evaporative fluid cooling device can greatly improve the overall cooling effect, and the temperature of the cooled fluid can be reduced to be close to the temperature of an external air wet bulb after the cooled fluid is cooled by the device; when the device is used in combination with a water-cooling host air conditioner, the condensation pressure of a refrigeration system can be reduced, the energy efficiency of the refrigeration system is improved, and therefore the energy consumption of equipment is reduced.
(2) The indirect evaporative fluid cooling device adopts a plurality of measures for increasing the evaporative cooling efficiency and improving the processing capacity, and has higher processing capacity compared with the common evaporative cooling equipment under the same volume, namely the problems of large volume and low processing capacity of the existing evaporative cooling equipment are solved.
(3) Compared with a conventional closed cooling tower, the indirect evaporative fluid cooling device can cool the cooled fluid to a lower temperature, so that when the air conditioning system is used, when the temperature of an external air wet bulb is lower than the temperature required by a cold source of the air conditioning system, the cooling medium of the indirect evaporative fluid cooling device can be directly introduced into the tail end for cooling; the fan and the water pump can adjust the load according to the requirement, and the energy consumption of the system can be reduced to the maximum extent.
Drawings
Fig. 1 is a schematic structural view of a fluid cooling device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of the installation of an air-cooled surface air cooler according to a first embodiment of the present invention;
FIG. 3 is a schematic view of the installation of an evaporative cooling heat exchanger in accordance with a first embodiment of the present invention;
FIG. 4 is a schematic structural view of an evaporative cooling heat exchanger according to a first embodiment of the present invention;
FIG. 5 is a schematic flow chart of the operation of three media according to the first embodiment of the present invention;
figure 6 is a psychrometric chart of the air cooling process of the first embodiment of the present invention;
FIG. 7 is a schematic structural view of a fluid cooling device according to a second embodiment of the present invention;
110 water receiving module, 110a fluid precooling surface cooler; 120 an evaporative cooling heat exchanger, 120a an evaporative cooling heat exchanger cooling fluid inlet, 120b an evaporative cooling heat exchanger cooling fluid outlet;
200 wet film; 300 air-cooled surface air coolers, 300a air-cooled surface air cooler fluid inlets, 300b air-cooled surface air cooler fluid outlets; 400 of a fan;
510 a catch basin; 520 circulating water pump; 530 automatic filtering and sewage discharging device, 531 check valve, 532 electric valve for sewage discharging and 533 filter screen; 540 spray module; a 550 water replenishing valve; 600 a housing; 710 air intake; 720 air outlet; 810 a fluid inlet; 820 fluid outlet.
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.
The first embodiment:
the indirect evaporative fluid cooling device of this embodiment, as shown in fig. 1, includes a housing 600, an air inlet 710, an air outlet 720, a fan 400, a fluid inlet 810, a water receiving module 110, a spraying module 540, an evaporative cooling heat exchanger 120, a fluid outlet 820, a wet film 200, an air cooling surface air cooler 300, a water collecting tank 510, a circulating water pump 520, and a water replenishing valve 550. The device comprises an air inlet, an air cooling surface cooler, a wet film, an evaporative cooling heat exchanger, a spraying module, a water collecting module, a fan and an air outlet in sequence from the external air angle; the spraying water angle is that the water collecting tank, the circulating water pump, the air cooling surface air cooler, the evaporative cooling heat exchanger, the wet film, the water collecting tank and the water replenishing valve are arranged in sequence; the fluid to be cooled is divided into a fluid inlet, an evaporative cooling heat exchanger and a fluid outlet in sequence.
The fan 400 is arranged at the upper part of the indirect evaporative fluid cooling device, the water receiving module 110 is arranged below the fan 400, the evaporative cooling heat exchanger 120 is arranged below the water receiving module 110, the wet film 200 is arranged below the evaporative cooling heat exchanger 120, the air cooling surface air cooler 300 is arranged at the front side or below of the air inlet direction of the wet film 200, and the air cooling surface air cooler 300 is communicated with the air inlet 710.
A water replenishment valve 520 is connected to the sump 510 to replenish the shower water for depletion.
In this embodiment, the air-cooling surface cooler 300 is disposed in front of the wet film 200, and may be disposed below the wet film or in front of the wet film in the air intake direction. The air cooling surface cooler and the wet film are arranged in parallel or form a certain angle. As shown in fig. 1, the air-cooled surface air cooler is located below the wet film, which ensures that the outdoor air enters the fluid cooling device first to be cooled and then enters the wet film. Preferably, the air-cooled surface air coolers 300 are arranged in a V-shape.
Preferably, as shown in fig. 2, the shower water is pumped from the sump by a circulating water pump, flows through the air-cooled surface air cooler 300 from bottom to top and from inside to outside, and is then forced into the shower module 540. The heat exchange between the spray water and the external air between the whole layers is in a counter-flow mode, and compared with the conventional heat exchange between the layers in a forward-flow mode, the heat exchange efficiency of the air cooling surface air cooler 300 is improved. As shown in fig. 2, on the air-fluid-cooled surface air cooler 300, the external air flows out of the air-cooled surface air cooler through the coils in layers from outside to inside, and the spray water flows out of the surface air cooler from the outermost coils of the coils in layers from inside to outside along the coils in an S-shaped manner, and the air flow and the spray water flow between the coil layers are in a counter-flow mode, that is, the inter-layer counter-flow in this embodiment.
The air cooling surface cooler of the embodiment is preferably a radial fin tube type heat exchanger; preferably, the parameters of the radial finned tubes are selected such that in this embodiment, the temperature of the outside air flowing through the air-cooled surface air cooler is reduced by 2-10 ℃ (year-round condition), and the temperature of the shower water flowing through the air-cooled surface air cooler is increased by 1-5 ℃ (year-round condition). Through preferred air cooling surface cooler, realized the obvious cooling to the outside air, be favorable to follow-up air temperature after the wet film to be close to outside air dew point temperature, realized the obvious intensification to the shower water, be favorable to improving follow-up evaporation capacity of shower water on the evaporative cooling heat exchanger to improve the cooling capacity of this embodiment on the whole.
The wet film 200 of this embodiment is preferably a paper or polymer composite wet film with a certain thickness, so that when the fluid cooling device is in use, the relative humidity of the air humidified by the wet film is not lower than 95% (generally, the relative humidity is 95% -97%), and an evaporation cooling process mainly occurs on the wet film, so that the temperature of the air leaving the wet film and the temperature of the leaving water both approach to the wet bulb temperature of the air entering the wet film, are lower than the wet bulb temperature of the outdoor air, and approach to the dew point temperature of the outdoor air.
The wet films of the embodiment are preferably arranged in a V shape, and the inclined arrangement of the wet films increases the windward area and the surface area, thereby improving the evaporative cooling efficiency of the wet films.
The evaporative cooling heat exchanger 120 of the present embodiment is preferably a radial finned tube heat exchanger arranged in a V-shape or inverted V-shape. As shown in fig. 3 and 4, the radial finned tube heat exchanger is composed of a coil 130 and fins 140, the coil 130 is composed of a liquid guiding part 131 and a connecting part 132, the liquid guiding parts connected in the vertical direction are connected in an S-shape through the connecting part 132 to form a row of vertical coils, so that the cooled fluid in each row of vertical coils is ensured to flow downwards from top to bottom, the cooled fluid entering the radial finned tubes and the air entering the radial finned tubes are subjected to heat exchange in a countercurrent mode between the whole layers, and the heat exchange efficiency is high. Conventionally, the liquid guiding part 131 and the connecting part 132 of the coil are in S-shaped connection in the horizontal direction, so that the cooled fluid entering the radial finned tubes and the air entering the radial finned tubes exchange heat in a cross flow mode, and the heat exchange efficiency is low.
The fins 140 of the radial finned tube heat exchanger of the embodiment shown in fig. 4 are corrugated in the direction of air flow (not shown in the drawings, and those skilled in the art can infer corrugated fins from straight finned fins in fig. 4) or are arranged in a staggered manner or in a corrugated staggered manner. The fins of the radial finned tube heat exchanger are corrugated along the airflow direction, so that the contact area of air and the fins is increased and the heat exchange efficiency is improved compared with the conventional straight-sheet-shaped situation. The fins of the radial finned tube heat exchanger are arranged in a staggered mode along the air flow direction, so that air flow disturbance is increased and heat exchange efficiency is improved compared with the conventional arrangement. Particularly, when the fins are arranged in a staggered mode, the fins in one row can extend into the space between the fins in the adjacent row, the area of the whole fins is increased, air flow disturbance is enhanced, and the heat exchange efficiency of the heat exchanger is improved.
As shown in fig. 1, the evaporative cooling heat exchanger 120 is in an inverted V-shaped arrangement, which can be derived from the figure by one skilled in the art. The evaporative cooling heat exchanger in the embodiment increases the windward area and the heat exchange area through V-shaped or inverted V-shaped arrangement, improves the heat exchange capacity of the radial finned tube heat exchanger, and improves the cooling performance of the whole fluid cooling device. Preferably, according to the design requirement of the cooling performance of the indirect evaporative fluid cooling device, 2 or more evaporative cooling heat exchangers can be arranged by setting the number of the evaporative cooling heat exchangers, the evaporative cooling heat exchangers are arranged one by one from top to bottom, and a spraying module is arranged above the upper surface of each evaporative cooling heat exchanger.
The fluid inlet 120a of the evaporative cooling heat exchanger 120 in this embodiment is at the upper left of the evaporative cooling heat exchanger and the fluid outlet 120b is at the lower right of the evaporative cooling heat exchanger, as shown in fig. 3. The coil connected with the fluid inlet 120a of the evaporative cooling heat exchanger is arranged above, the coil connected with the fluid outlet 120b of the evaporative cooling heat exchanger is arranged below, the temperature of the cooled fluid in the evaporative cooling heat exchanger is distributed along the air flowing direction to form gradient, the heat exchange between the cooled fluid and the air between layers of the integral evaporative cooling heat exchanger is in a countercurrent mode, and the evaporative heat exchange efficiency of the evaporative cooling heat exchanger is improved.
In this embodiment, the spray water heated by the air-cooled surface air cooler is uniformly sprayed onto the upper surface of the evaporative cooling heat exchanger, so that the spray water falling from the evaporative cooling heat exchanger is reduced to cold water at a temperature lower than the wet bulb temperature of the outside air after the sufficient heat exchange is completed. The temperature rise of the spray water can improve the temperature of the air at the upper part of the evaporative cooling heat exchanger, thus being more beneficial to the evaporation of the spray water on the evaporative cooling heat exchanger 120 and increasing the overall evaporative cooling capacity of the equipment.
The spraying module 540 is formed by connecting a plurality of spray heads and pipelines, the spray heads are uniformly arranged and aligned with the evaporative cooling heat exchanger, and the average particle size of water drops sprayed by the spray heads is less than 1 mm. The shower nozzle is preferably solid conical nozzle, through preferred shower nozzle and water pressure, makes the shower water be the form of the particle size less than 1mm droplet and evenly sprays on evaporation cooling heat exchanger (preferred average particle size is 0.5 mm's technology), and not traditional rivers column sprays, also not traditional atomizing sprays, and this kind of spraying makes the drop of shower water at evaporation cooling heat exchanger surface evenly distributed, and makes the shower water be obvious temperature gradient distribution in the air flow direction, and the shower water temperature is high above the evaporation cooling heat exchanger, and the shower water temperature is low below the evaporation cooling heat exchanger. Experiments show that when the particle size of the spray water is less than 0.5mm, most of the spray particles are easily blown away by wind; when the particle size of spraying water is larger than 1mm, the spraying water is unevenly distributed, and meanwhile, the evaporation rate is reduced because the total surface area of the spraying water outlet ball is reduced.
Preferably, a hydrophilic coating with an infrared radiation heat dissipating material is provided on the surface of the evaporative cooling heat exchanger. In this embodiment, the coating contains nano-silica or nano-alumina, and transition metal oxides such as cobalt, nickel, and manganese. The coating can improve the heat exchange efficiency of the evaporative cooling heat exchanger, better adsorbs water drops to form a water film, increases the evaporation efficiency of spray water, and improves the cooling capacity of the indirect evaporative fluid cooling device on the whole.
In particular, the indirect evaporative fluid cooling device is further provided with an automatic filtration and blowdown device 530, as shown in fig. 1, the filtration and blowdown device is arranged at the bottom of the housing, the filtration and blowdown device is arranged between the water pump and the air-cooled surface air cooler, and the filtration and blowdown device enables the spray pumped out by the water pump to be filtered and then enter the air-cooled surface air cooler and then enter the spray module. The automatic sewage draining and filtering device 530 is composed of a check valve, a sewage draining electric valve, a filter screen, an automatic sewage draining controller and a filtering device shell. The system is provided with at least two paths of circulating water pumps 520 and at least two paths of automatic sewage draining and filtering devices 530, wherein the circulating water pumps and the automatic sewage draining and filtering devices are matched in a one-to-one mode. Under the normal spraying state, all circulating water pumps are opened, the electric blowdown valve in the whole indirect evaporative fluid cooling device is closed, spray water is pumped out from the water collecting tank by the circulating water pumps, and the spray water is upwards provided through a check valve and a filter screen of the automatic filtering device; under the blowdown state, certain blowdown motorised valve is opened among the whole indirect evaporative fluid cooling device, and the circulating water pump supporting with it also awaits the opportune moment, and other blowdown motorised valves are closed, and other circulating water pumps add large-traffic work, and the shower water in the catch basin is taken out by the circulating water pump in the work, impresses whole shower pipeline, and that the shower pipeline that the blowdown motorised valve was opened is influenced by water pressure in the pipeline, and the backwash filter screen reaches the effect of blowdown.
Preferably, the electric pollution discharge working condition is controlled by setting a timing method. A pressure difference detection device can be additionally arranged in the automatic sewage discharge filtering device to detect the pressure difference between the front and the back of the filter screen, and the automatic sewage discharge frequency is adjusted through the pressure difference.
In the embodiment, at least two circulating water pumps and two sets of automatic filtering and sewage discharging devices are arranged, so that the embodiment can still normally work in a sewage discharging state, and the embodiment can continuously work; meanwhile, the circulating water pump of one spray water pipeline is used as the sewage discharge power of the other spray water pipeline, automatic strong sewage discharge is realized, and compared with natural sewage discharge, the sewage discharge efficiency is high; more than two circulating water pumps and more than two sets of automatic filtering and sewage discharging devices are arranged, more than two paths of spray water supply of the indirect evaporative fluid cooling device are realized, and the reliability of the device is improved.
The circulation process of the outside air, the shower water and the cooled fluid in this embodiment is shown in fig. 5. Compared with the prior art, the air-cooling surface air cooler 300 is added before the external air enters the wet film 200, the low-temperature spray water in the water collecting tank 510 is pressed into the air-cooling surface air cooler 300 from the water tank through the circulating water pump 520, the external air is pre-cooled by utilizing the temperature of the spray water in the water collecting tank, and the circulating water is heated by utilizing the external air. The designed air cooling surface air cooler 300 can realize a certain heat exchange amount, can realize the temperature rise of spray water by 1-5 ℃, and the temperature reduction of air by 2-10 ℃ (the air can be reduced to be near the temperature of an outdoor air wet bulb, generally higher than the temperature of outdoor air by 1-3 ℃), and the outdoor air is subjected to an equal humidity temperature reduction process on the air cooling surface air cooler.
FIG. 6 is a psychrometric chart of air in an indirect evaporative fluid cooling device, wherein outdoor air is subjected to an iso-humidity cooling process from state 1 (32 ℃, 70% RH, wet bulb temperature 27.3 ℃, dew point temperature 26.0 ℃) to state 2 (28.6 ℃, 85%), then subjected to an iso-enthalpy process to be humidified and cooled to state 3 (27.2 ℃, 95% RH), and then subjected to humidification and heat exchange with an evaporative cooling heat exchanger. Without an air-cooled surface air cooler, the outdoor air can only be humidified and cooled from state point 1 to state 4 (28.0 ℃, 95%) through an isenthalpic process. The dry bulb temperature of state 4 is higher than the wet bulb temperature of the outdoor air, and the dry bulb temperature of state 3 is lower than the wet bulb temperature of the outdoor air, close to the dew point temperature of the outdoor air. Another example in FIG. 5 is I (32 ℃, 40% RH), II (24 ℃, 63% RH), III (19.8 ℃, 95% RH), IV (22.3 ℃, 95% RH). The outdoor air is cooled by a precooling and efficient humidifying mode in a dry area, and the cooling amplitude is larger than that in a wet area.
The precooled air after passing through the air cooling surface cooler 300 enters the wet film along the airflow direction, and the evaporation and cooling process is carried out on the surface of the wet film, and meanwhile, the heat exchange process of the spray water and the precooled air also exists. Compared with the air before the air cooling surface cooler is not added, the temperature of the wet bulb of the air entering the wet film is lower, so that the temperature of the air and the wet film circulating water after humidification is lower, and cold water with lower temperature is obtained in the water collecting tank. The air entering the evaporative cooling heat exchanger is cooler, so that the cooling efficiency of the whole fluid cooling device is increased, the fluid can be cooled to a lower temperature, and the cooling capacity of the cooling tower is improved.
Preferably, the surface of the air-cooled surface cooler is provided with a super-hydrophobic coating added with an infrared radiation heat dissipation material. In this embodiment, the coating contains a nano-polymer organosilicon component and transition metal oxides such as cobalt, nickel, manganese, etc. The provision of such a coating can improve the heat exchange efficiency of the air-cooled surface air cooler and, as a whole, the cooling capacity of the indirect evaporative fluid cooling apparatus.
For example, the air flow rate of a closed cooling tower (namely the fluid cooling device) is 80000m3/h, the flow rate of spray water is 80m3/h, the fluid to be cooled is water, the temperature of inlet water is 30 ℃, and the flow rate of inlet water is 120m 3/h. At an ambient air parameter of 32 deg.C, 50% RH (at this time a wet bulb temperature of 23.8 deg.C, a dew point temperature of 20.4 deg.C). Under the condition, when the air cooling surface air cooler is not arranged, the parameters of the air entering the wet film are 32 ℃, 50% RH, the parameters of the air out of the wet film are 25.2 ℃, 95% RH, the temperature of the water collecting tank is 25.2 ℃, and the temperature of the water out of the cooling fluid is 26.8 ℃. In the present embodiment, when the air-cooled surface air cooler is provided, the air is cooled by the air-cooled surface air cooler, the parameters of the air entering the wet film are 25.3 ℃ and 74% RH, the parameters of the air exiting the wet film are 22.2 ℃ and 95% RH, the temperature of the water collecting tank is 21.9 ℃, and the temperature of the water exiting the cooling fluid is 23.2 ℃.
In one embodiment, the external air, the shower water, and the cooled fluid operate as follows:
1) the complete external air circulation process is as follows: the outside air enters the air cooling surface air cooler 300 from air inlets 710 on two sides of the equipment to be cooled, and then enters the wet film 200 to be humidified and cooled; the humidified and cooled external air enters the evaporative cooling heat exchanger 120 upwards for evaporation and heat exchange, and then flows through the water receiving module 110 and is sent out through the air outlet 720 by the fan 400.
2) The complete cooled fluid circulation process is as follows: the cooled fluid enters the water pipe of the evaporative cooling heat exchanger 120 through the water inlet 810, and the cooled fluid exchanges heat with spray water on the surface of the finned tube of the evaporative cooling heat exchanger 120 in an evaporative manner and exchanges heat with air, and then is sent out through the water outlet 820.
3) The complete spray water circulation process comprises the following steps: the spray water in the collecting tank 510 is filtered by the circulating water pump 520, enters the air cooling surface air cooler 300 along the spray water pipeline, and then enters the spray module 540; the sprayed spray water from the spray module 540 is sprayed on the evaporative cooling heat exchanger 300; the water flowing down from the evaporative cooling heat exchanger 300 flows into the wet film 200 and then into the sump 510 to form a cycle.
Preferably, the indirect evaporative fluid cooling device according to this embodiment is further provided with an inlet air temperature and humidity sensor, an outlet air temperature sensor, an inlet water temperature sensor, an outlet water temperature sensor, and a controller, and the controller can automatically adjust the loads of the fan 400 and the circulating water pump 520 according to the outlet water temperature measured value and the outlet water temperature target value, so that the outlet water temperature reaches a preset value.
In the first embodiment, the air cooling surface air cooler is added in front of the wet film of the fluid cooling device, so that the temperature of air entering the wet film is reduced, the temperature of circulating water passing through the wet film is lower, the temperature of spraying water in the water collecting tank is lower, and the cooling capacity of the whole cooling tower is improved; meanwhile, the air cooling surface cooler plays a role in preheating spray water, the evaporation capacity of the evaporative cooling heat exchanger is improved, and the cooling capacity of the cooling tower is improved.
The cooled fluid in this embodiment may be water or other liquid medium. In the field of data centers, when a water-cooling air-conditioning system is adopted to cool the data centers, the device can cool chilled water or cooling water of the water-cooling air conditioner. Cooling water is mainly cooled in summer; other seasons mainly cool the chilled water. In the field of data centers, when a liquid cooling air conditioning system is adopted to cool a data center, the device cools cooling liquid of the liquid cooling air conditioning system.
Second embodiment:
as shown in FIG. 7, the indirect evaporative fluid cooling device 10 of an embodiment of the present invention includes a fluid pre-cooling surface cooler 110 a; an evaporative cooling heat exchanger 120; a wet film 200; an air-cooled surface air cooler 300; a fan 400; a sump 510; a circulating water pump 520; an automatic filtering and blowdown 530; a spray module 540; a water replenishment valve 550; a housing 600; an air inlet 710; an air outlet 720; a fluid inlet 810; a fluid outlet 820.
The difference between this embodiment and the first embodiment is that a common water collecting module is replaced by a fluid precooling surface cooler, where the fluid precooling surface cooler plays a role of a water collector, and simultaneously precools the cooled fluid, so as to improve the utilization rate of the residual air cooling of the cooling tower and improve the cooling capacity of the indirect evaporative fluid cooling device.
The fluid pre-cooling surface cooler 110a is below the fan 400 and above the evaporative cooling heat exchanger 120; the wet films 200 are arranged below the evaporative cooling heat exchanger 120 in a V shape; like the evaporative cooling heat exchanger 120 in the first embodiment, the fluid to be cooled is in countercurrent heat exchange with air between the whole layers of the fluid precooling surface cooler, so that the heat exchange efficiency of the fluid precooling surface cooler is improved.
The fluid inlet 810 is connected with a water inlet pipe of the fluid precooling surface cooler 110, a water outlet pipe of the fluid precooling surface cooler 110a is connected with a water inlet pipe of the evaporative cooling heat exchanger 120, and a water outlet pipe of the evaporative cooling heat exchanger 120 is connected with a fluid outlet 820;
preferably, the fluid precooling surface cooler 110a is a fluid precooling surface cooler with finned tubes and is structured as a radial finned tube heat exchanger, and fins of the fluid precooling surface cooler are in a straight sheet shape or a corrugated shape, and are preferably in a corrugated shape or staggered arrangement along the direction of the air flow.
Preferably, the surface of the fluid precooling surface cooler is provided with a hydrophilic coating added with an infrared radiation heat dissipation material. In this embodiment, the coating layer contains nano silica or nano alumina, and also contains transition metal oxides such as cobalt, nickel, manganese, and the like. The coating can improve the heat exchange efficiency of the fluid precooling surface air cooler, better adsorb water drops to form a water film, increase the evaporation efficiency of spray water and improve the cooling capacity of the indirect evaporative fluid cooling device on the whole.
The indirect evaporative fluid cooling device 10 of the present embodiment operates as follows:
1) the complete external gas circulation process is as follows: the outside air enters the air cooling surface air cooler 300 from air inlets 710 on two sides of the equipment to be cooled, and then enters the wet film 200 to be humidified and cooled; the humidified and cooled external air enters the evaporative cooling heat exchanger 120 upwards for evaporation and heat exchange, and then flows through the water receiving module 110 and is sent out through the air outlet 720 by the fan 400.
2) The complete fluid cooling cycle process is as follows: the cooling water enters the fluid precooling surface cooler 110a from the water inlet 810 for primary cooling, then enters the evaporative cooling heat exchanger 120 for secondary cooling, and then is sent out through the water outlet 820.
3) The complete spray water circulation process comprises the following steps: the spray water in the collecting tank 510 is filtered by the circulating water pump 520, enters the air cooling surface air cooler 300 along the spray water pipeline, and then enters the spray module 540; the sprayed spray water from the spray module 540 is sprayed on the evaporative cooling heat exchanger 300; the water flowing down from the evaporative cooling heat exchanger 300 flows into the wet film 200 and then into the sump 510 to form a cycle.
The embodiment sets the water receiving module of the fluid cooling device as the fluid precooling surface cooler, so that the air flowing out of the evaporative cooling heat exchanger and the cooled fluid exchange heat on the fluid precooling surface cooler, the cold source of the cold air is fully utilized, and the cooling capacity of the fluid cooling device is improved.
Claims (8)
1. An indirect evaporative fluid cooling device, comprising:
the device comprises a shell, an air inlet, an air outlet, a fan, a fluid inlet, a water collecting module, a spraying module, an evaporative cooling heat exchanger, a fluid outlet, a wet film, an air cooling surface air cooler, a water collecting tank, a circulating water pump and a water supplementing valve;
the fan is arranged at the upper part of the indirect evaporative fluid cooling device, the water receiving module is arranged below the fan, the evaporative cooling heat exchanger is arranged below the water receiving module, the wet film is arranged below the evaporative cooling heat exchanger, the air cooling surface cooler is arranged at the front side or below the air inlet direction of the wet film, and the air cooling surface cooler is communicated with the air inlet;
the fluid inlet, the evaporative cooling heat exchanger and the fluid outlet are connected in sequence through a cooling fluid pipeline;
the spray module is arranged above the evaporative cooling heat exchanger, a plurality of spray heads of the spray module are uniformly distributed above the upper surface of the evaporative cooling heat exchanger, and nozzles of the plurality of spray heads are arranged in alignment with the upper surface of the evaporative cooling heat exchanger;
the water replenishing valve is connected with the water collecting tank; the water collecting tank, the circulating water pump, the air cooling surface air cooler and the spraying module are connected through a spraying water pipeline;
when the circulating water pump operates, spray water in the water collecting tank firstly enters the air cooling surface air cooler through the circulating water pump along the spray water pipeline and then enters the spray module; spraying the sprayed spray water through the spraying module onto the evaporative cooling heat exchanger; a water stream flowing down from the evaporative cooling heat exchanger, flowing into the wet film, and then flowing into the sump;
when the fan operates, external air enters the air cooling surface air cooler from the air inlet to be cooled, and then enters the wet film to be humidified and cooled; the humidified and cooled external air upwards enters the evaporative cooling heat exchanger for evaporation and heat exchange, then flows through the water receiving module and is sent out by the fan.
2. The indirect evaporative fluid cooling device of claim 1, wherein:
the evaporative cooling heat exchanger is a radial finned tube heat exchanger, and the radial finned tube heat exchanger is arranged in a V shape or an inverted V shape; fins on the radial finned tube heat exchanger are uniformly distributed, air circulation spaces in the finned tube heat exchanger are completely covered and uniformly divided, and the fins are corrugated along the air flow direction or staggered along the air flow direction; the flow direction of the cooled fluid is arranged in a counter-current manner in the radial finned tube heat exchanger layer relative to the air flow direction.
3. The indirect evaporative fluid cooling device of claim 1, wherein:
the indirect evaporative fluid cooling device is further provided with an air inlet temperature and humidity sensor, an air outlet temperature sensor, an water inlet temperature sensor, a water outlet temperature sensor and a controller, wherein the controller can automatically adjust the load of the fan and the load of the circulating water pump according to the water outlet temperature and a preset temperature target value, so that the water outlet temperature reaches the preset temperature target value.
4. The indirect evaporative fluid cooling device of claim 1, wherein:
the water collecting module is a fluid precooling surface cooler, and the fluid inlet, the fluid precooling surface cooler, the evaporative cooling heat exchanger and the fluid outlet are sequentially connected through the cooling fluid pipeline.
5. The indirect evaporative fluid cooling device of claim 1, wherein:
the indirect evaporative fluid cooling device is also provided with an automatic filtering and sewage draining device, the automatic filtering and sewage draining device is arranged between the circulating water pump and the air cooling surface air cooler, and the indirect evaporative fluid cooling device is at least provided with two sets of automatic filtering and sewage draining devices and the circulating water pump.
6. The indirect evaporative fluid cooling device of claim 1, wherein:
and a hydrophilic coating added with an infrared radiation heat dissipation material is arranged on the surface of the evaporative cooling heat exchanger.
7. The indirect evaporative fluid cooling device of claim 4, wherein:
the surface of the fluid precooling surface cooler is provided with a hydrophilic coating added with an infrared radiation heat dissipation material.
8. The indirect evaporative fluid cooling device of claim 4, wherein:
the average particle size of water drops sprayed by the spray head of the spray module is less than 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020879.1A CN111023374A (en) | 2020-01-09 | 2020-01-09 | Indirect evaporative fluid cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020879.1A CN111023374A (en) | 2020-01-09 | 2020-01-09 | Indirect evaporative fluid cooling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111023374A true CN111023374A (en) | 2020-04-17 |
Family
ID=70202570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010020879.1A Pending CN111023374A (en) | 2020-01-09 | 2020-01-09 | Indirect evaporative fluid cooling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111023374A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486622A (en) * | 2020-05-20 | 2020-08-04 | 格兰立方能源科技(江苏)有限公司 | Novel evaporative cooler |
| CN112944739A (en) * | 2021-04-15 | 2021-06-11 | 广东海悟科技有限公司 | Double-circulation refrigeration system using dew point temperature for cooling and control method thereof |
| CN114234674A (en) * | 2021-11-19 | 2022-03-25 | 河钢股份有限公司 | Air cooler water film cooling strengthening device and method |
| WO2022063155A1 (en) * | 2020-09-23 | 2022-03-31 | 深圳易信科技股份有限公司 | Longitudinal finned tube heat exchanger having internal heat exchange sleeves and nozzles, and closed cooling tower having same |
| WO2024174903A1 (en) * | 2023-02-22 | 2024-08-29 | 杭州阿里云飞天信息技术有限公司 | Heat dissipation device, heat dissipation system, heat dissipation device control method, and data center |
-
2020
- 2020-01-09 CN CN202010020879.1A patent/CN111023374A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111486622A (en) * | 2020-05-20 | 2020-08-04 | 格兰立方能源科技(江苏)有限公司 | Novel evaporative cooler |
| WO2022063155A1 (en) * | 2020-09-23 | 2022-03-31 | 深圳易信科技股份有限公司 | Longitudinal finned tube heat exchanger having internal heat exchange sleeves and nozzles, and closed cooling tower having same |
| CN112944739A (en) * | 2021-04-15 | 2021-06-11 | 广东海悟科技有限公司 | Double-circulation refrigeration system using dew point temperature for cooling and control method thereof |
| CN114234674A (en) * | 2021-11-19 | 2022-03-25 | 河钢股份有限公司 | Air cooler water film cooling strengthening device and method |
| CN114234674B (en) * | 2021-11-19 | 2024-01-23 | 河钢股份有限公司 | Water film cooling strengthening device and method for air cooler |
| WO2024174903A1 (en) * | 2023-02-22 | 2024-08-29 | 杭州阿里云飞天信息技术有限公司 | Heat dissipation device, heat dissipation system, heat dissipation device control method, and data center |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211668307U (en) | Cooling tower with precooling apparatus | |
| CN111023374A (en) | Indirect evaporative fluid cooling device | |
| US9055696B2 (en) | Systems for removing heat from enclosed spaces with high internal heat generation | |
| US9032742B2 (en) | Methods for removing heat from enclosed spaces with high internal heat generation | |
| US9021821B2 (en) | Ventilation device for use in systems and methods for removing heat from enclosed spaces with high internal heat generation | |
| CN205071578U (en) | Compound cooling system of data disconnect -type heat pipe for computer lab - evaporative condenser | |
| US20120167610A1 (en) | Indirect air-side economizer for removing heat from enclosed spaces with high internal heat generation | |
| CN111442576B (en) | Working method of air-conditioning refrigeration system | |
| US7266970B2 (en) | Water cooling system with full heat recovery | |
| CN105485800A (en) | Natural cooling-mechanical refrigerating integrated air conditioner system for data center | |
| EP1614973A2 (en) | Water cooling system with full heat recovery | |
| CN113670090A (en) | Indirect evaporative fluid cooling device with built-in heat exchanger | |
| WO2021228098A1 (en) | Cascade-type evaporative cooling heat pump modular unit | |
| CN110191619A (en) | Modularization air supply air-conditioner system suitable for data center's indirect evaporation natural cooling | |
| WO2022063155A1 (en) | Longitudinal finned tube heat exchanger having internal heat exchange sleeves and nozzles, and closed cooling tower having same | |
| CN105263294A (en) | Cooling system of divided composite heat pipe evaporative condenser for data machine room | |
| CN111706946A (en) | Evaporation cooling precision air conditioner | |
| CN111637569A (en) | Indirect evaporation air cooling device | |
| CN111536809A (en) | Composite cooling tower and cooling method | |
| CN111486718A (en) | Closed cooling tower and cooling method | |
| CN212320479U (en) | Indirect evaporative fluid cooling device with built-in heat exchanger | |
| CN207247488U (en) | Module combined type indirect heat exchange core | |
| CN211400162U (en) | Indirect evaporative fluid cooling device | |
| CN2658688Y (en) | Evaporation type condenser having finned cooling pipe set | |
| CN2556571Y (en) | Counterflow evaporative condenser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |