CN204460557U - The board-like dew point indirect evaporative cooler of adverse current of external flow dividing structure and channel partition - Google Patents

Abstract

The utility model discloses a counterflow plate type dew-point indirect evaporative cooler with an external shunt structure and a passage partition, which comprises a core body of the dew-point indirect evaporative cooler arranged in the casing, and the top of the casing is provided with an air inlet, a secondary air The air outlet is provided with a primary air supply port at the bottom; the core of the cooler is composed of several dry channels and wet channels arranged side by side in parallel and at intervals; there are partitions between the dry channels and wet channels, and the partitions are located in the dry channel. One side of the channel is a hydrophobic surface, and the side of the wet channel is a hydrophilic surface; the lower part of the cooler core is provided with a tuyer partition for separating the air outlet of the dry channel from the air inlet of the wet channel. Part of the air in the dry channel enters the wet channel through the split hole; the air in the dry channel and the wet channel flows countercurrently; the channel partition of the cooler core includes a plastic substrate, and the electrostatic flocking process is used to flock one side of the substrate, thereby A separator with one side hydrophobic and the other hydrophilic is obtained, and the thickness of the separator is 0.1-0.4 mm.

Description

Counterflow plate dew point indirect evaporative cooler with external split structure and channel partition

technical field

The utility model belongs to the technical field of air-conditioning and refrigeration equipment, and in particular relates to an improved dew point indirect evaporative cooler, which adopts a counterflow plate cooler.

Background technique

The indirect evaporative cooler is a new type of air-conditioning refrigeration equipment. It uses the difference between the dry bulb temperature and the wet bulb temperature in the natural ambient air to obtain enthalpy and humidity energy through the heat and moisture exchange between water and air. It is an environmentally friendly, efficient and economical cooling method. Without the use of compressors and refrigerants, the gas can be cooled to close to the wet bulb temperature of the air without increasing the moisture content of the produced air. Fresh air can be used in the evaporative cooling process, and the air quality is good.

As an improvement to indirect evaporative cooling technology, the dew point indirect evaporative cooler can realize multi-stage evaporative cooling. It utilizes the decreasing secondary air wet bulb temperature to promote heat and moisture exchange, and reduces the temperature of the air to be cooled to lower than the wet bulb temperature of the inlet air, and even reaches the dew point temperature, which is lower than the traditional indirect evaporative cooling technology.

The dew point indirect evaporative cooler is composed of dry channels and wet channels that are evenly distributed and spaced apart from each other. The cooled air flows in the dry channel as primary air. Part of the primary air flows into the wet channel plate through the baffle between the dry channel and the wet channel, and flows in the wet channel together with the original air in the wet channel as secondary air. There is continuous water spray in the wet channel, and the secondary air and water are in direct contact and mixed for heat and moisture exchange, and then separated. The cooled secondary air in the wet channel absorbs heat in the dry channel, and the primary air is wet-cooled. As the temperature of the air flowing into the wet side continues to decrease, the primary air is further cooled by sensible heat. This continues until the primary air is isohumidically cooled to below the wet bulb temperature of the inlet state and close to its dew point temperature, and the humidity is kept constant. After the secondary air absorbs heat, it is exhausted from the wet channel to the outside.

At present, the commonly used cooler structures mainly include tube type and plate type. Compared with tube coolers, plate evaporative coolers have the advantages of high heat transfer efficiency, relatively small resistance, compact structure, easy disassembly and cleaning, and flexible change and combination of heat transfer surfaces.

The flow direction of primary air and secondary air, and the flow direction of secondary air and water play a major role in the cooling efficiency of the cooler, and also determine the degree of cooling of the primary air. Both experiments and theoretical calculations have confirmed that at the same inlet and outlet temperatures, when the primary air and secondary air, secondary air and spray water flow countercurrently, the temperature difference between the two fluids changes relatively smoothly and the average temperature difference is large, which is more conducive to heat exchange. Heat exchange is the most efficient form of cooling and saves a certain amount of space. However, due to the difficulty in the layout of the evaporative cooling system, the previous flow method mostly adopts the cross-flow type.

In addition, the choice of channel partition material is also an important factor affecting the performance of the cooler. The secondary air in the wet channel, the circulating water and the primary air in the dry channel flow in their respective flow channels. The channels are separated by channel partitions. The fluids do not contact each other. The heat is transferred from the primary air to the secondary through the channel partitions. Air completes the cooling process, so the channel partitions are required to have relatively good thermal conductivity, and one side is hydrophilic (wet channel side) and the other side is hydrophobic (dry channel side), which is convenient for spray water attachment and enhances heat and mass exchange with secondary air. At present, the commonly used channel partition materials are mostly aluminum foil, plastic, fiber sheet or composite material. The performance of a single material is single, and it cannot have the condition that one side is hydrophilic and the other side is hydrophobic and the stiffness is sufficient. The composite sheet is affected by the composite process, and the hydrophilic effect is not good, and the thick channel partition is not conducive to heat exchange, so it needs to be replaced. an ideal alternative material.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a counterflow plate dew point indirect evaporative cooler with an external shunt structure. The utility model makes the primary air in the dry channel, the secondary air in the wet channel, and the secondary air in the wet channel The spray water can realize countercurrent heat exchange in the vertical direction of the main body in the cooler, increase the heat transfer temperature difference, improve the heat and mass transfer driving potential, improve the cooling efficiency of the cooler, and reduce the internal resistance of the cooler. At the same time, the channel partition of the cooler core in the utility model uses plastic as the base material, and uses the plane electrostatic flocking process to flock one side of the base material, which improves the evaporation performance and thermal conductivity after water absorption, Thus, the heat exchange performance of the whole plate dew point indirect evaporative cooler is improved.

In order to solve the above technical problems, the utility model proposes a counterflow plate type indirect evaporative cooler with an external shunt structure, which includes a casing and a dew point indirect evaporative cooler core arranged in the casing. There are air inlets, secondary air exhaust outlets and water distributors. The bottom of the casing is equipped with an upper opening water collection tank, a circulating water pump and a primary air supply port. The tuyere is connected to the room, the secondary air exhaust port is provided with an exhaust fan, the secondary air exhaust port is connected to the outdoor, and a water supply pipe is connected from the water collecting tank to the water distributor through the circulating water pump; The core of the dew point indirect evaporative cooler is composed of more than one cooling unit stacked side by side, each cooling unit includes dry channels and wet channels arranged side by side in parallel, and the side-by-side stacked cooling units are arranged at intervals between dry channels and wet channels; A channel partition is respectively arranged between the dry channel and the wet channel, and the side of the channel partition on the dry channel is a hydrophobic surface, and the side of the channel partition on the wet channel is a hydrophilic surface. A first corrugated plate is provided in the channel, both sides of the first corrugated plate are hydrophobic surfaces, a second corrugated plate is provided in the wet channel, and both sides of the second corrugated plate are hydrophilic surfaces; The top of the dry passage is provided with a dry passage air inlet connected with the air inlet, and the bottom of the dry passage is provided with a dry passage air outlet connected with the primary air supply port; The spray water inlet facing the water distributor, the top of the wet channel is also provided with a wet channel air outlet connected to the secondary air outlet, and the bottom of the wet channel is provided with a wet channel air inlet; The lower part of the dew point indirect evaporative cooler core is provided with a tuyer partition for separating the air outlet of the dry channel from the air inlet of the wet channel. Part of the air flows out from the air outlet of the dry channel and passes through the split hole, and enters the wet channel from the air inlet of the wet channel to form secondary air flowing upward; the primary air in the dry channel and the wet channel of the dew point indirect evaporative cooler core The secondary air in the cooler exchanges heat in a countercurrent direction in the vertical direction; the water collection tank is located on the side of the wet channel air inlet of the tuyere partition, and the spray water flows into the wet channel from top to bottom through the water distributor, and finally enters the In the water collection tank, the secondary air in the wet channel and the spray water of the water distributor conduct countercurrent heat exchange along the vertical direction in the cooler.

When the counterflow plate dew point indirect evaporative cooler with an external shunt structure of the utility model is working, inside the cooler, the air enters the dry channels arranged at intervals from the air inlet on the upper part to form the primary air running downward, and part of the primary air flows from the cooling It is discharged from the air outlet of the dry channel at the lower part of the device, and sent into the room through the connected primary air supply port. After the remaining part of the primary air flows to the bottom of the cooler, it enters the wet channel from the air inlet of the wet channel through the diversion hole set on the air outlet partition plate at the lower part of the cooler core, forming secondary air that runs upward in the wet channel. The secondary air from bottom to top and the primary air from top to bottom in the dry channel flow in reverse in the main section of the cooler to increase the sensible heat exchange efficiency. At the same time, there is spray water flowing from top to bottom inside the wet channel, which also forms a reverse flow with the secondary air from bottom to top in the wet channel, increasing the heat and moisture exchange efficiency. After the temperature and moisture content of the secondary air increase, it is exhausted to the outside through the secondary air outlet on the upper part of the cooler.

The utility model proposes a channel partition for the above-mentioned counterflow plate type dew point indirect evaporative cooler with an external shunt structure, which is a single-sided plastic flocking material. The channel partition includes plastic substrates (hard plastic sheets such as PET, PVC, PP, PS, ABS) and fluff with good water absorption (nylon, viscose, acrylic fiber, rayon, etc.). The channel partition is prepared by flocking on one side of the plastic substrate by using a planar electrostatic flocking process, so that the fluff evenly sticks to the planted substrate to form a heat exchange side after absorbing water and evaporating. The fluff is a water-absorbing material, and the plastic substrate is a hydrophobic material, thereby obtaining a channel partition with one side hydrophilic and the other side hydrophobic. The thickness of the channel partition is 0.1-0.4mm.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The utility model adopts fresh air in the evaporative cooling process without using compressors and refrigerants, and the air quality is good. Since only the supply/exhaust fan and water pump consume energy during operation, it saves a lot of power consumption compared with ordinary household split air conditioners. A small amount of tap water is selected as the spray water in the dew point indirect evaporative cooler, and it can be recycled without causing waste.

(2) The utility model uses plastic flocking composite material for the channel partition of the cooler core for the first time, and uses electrostatic flocking technology to evenly stick the fluff on the plastic substrate. Compared with the commonly used single sheet or two sheet composite materials, the thickness of the channel partition is reduced, and at the same time, the water absorption effect of the wet channel surface of the channel partition is enhanced.

(3) The dew point indirect evaporative cooler adopted by the utility model uses a part of the primary air to enter the wet channel to continuously reduce the wet bulb temperature of the secondary air, thereby reducing the temperature of the primary air, so that the cooled air can theoretically reach the advanced level. The dew point temperature of the wind air. Compared with the traditional indirect evaporative cooler, which can only reach the wet-bulb temperature of the intake air at most, the temperature of the supply air is reduced without increasing the moisture content of the output air.

(4) The form of the counter-flow plate cooler of the utility model enables the primary air in the dry channel, the secondary air in the wet channel, the secondary air in the wet channel and the spray water to realize countercurrent heat exchange in the vertical direction of the main body of the cooler , improving the heat transfer efficiency of the cooler. Moreover, the wind pressure loss of the air flow in the channel of the plate structure is very small, which reduces the resistance of the fan, thereby reducing energy consumption.

Description of drawings

Fig. 1 is a schematic diagram of the cross-sectional structure of the dry channel of the counterflow plate dew point indirect evaporative cooler with an external shunt structure of the present invention;

Figure 2 is a schematic diagram of the cross-sectional structure of the wet channel of the counterflow plate dew point indirect evaporative cooler with an external shunt structure of the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of cooler core body in the utility model;

Fig. 4 is a schematic diagram of an exploded structure of the core of the cooler in the present invention.

In the figure: 1-air inlet, 2-blower, 3-primary air, 4-split hole, 5-primary air supply port, 6-secondary air, 7-secondary air exhaust port, 8-exhaust fan, 9 -Chassis, 10-Water Distributor, 11-Water baffle, 12-Water supply pipe, 13-Circulating water pump, 14-Water collection tank, 15-Temperature partition, 16-Cooler core, 17-Dry channel, 18 -wet channel, 19-channel partition, 20-first corrugated plate, 21-dry channel air inlet, 22-dry channel air outlet, 23-wet channel air inlet, 24-spray water inlet, 25-second corrugation Plate, 26 - wet channel air outlet.

Detailed ways

The technical scheme of the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 and FIG. 2 , a counterflow plate dew point indirect evaporative cooler proposed by the utility model includes a casing 9 and a dew point indirect evaporative cooler core 16 arranged in the casing 9 .

The top of the casing 9 is provided with an air inlet 1, a secondary air outlet 7 and a water distributor 10, and the bottom of the casing 9 is provided with an upper opening type water collection tank 14, a circulating water pump 13 and a primary air supply outlet 5 , the air inlet 1 is provided with a blower 2 connected by an air duct, the primary air supply port 5 communicates with the room, the secondary air exhaust port 7 is provided with an exhaust fan 8, and the secondary air exhaust The tuyere 7 communicates with the outside, the primary air 3 is cooled and led to the room by the primary air supply port 5, the secondary air 6 is discharged to the outside through the secondary air exhaust port 7, and passes through the water collecting tank 14 through the circulating water pump 13 to The water distributor 10 is connected with a water supply pipe 12 .

As shown in Figures 3 and 4, the dew point indirect evaporative cooler core 16 is composed of more than one cooling unit body stacked side by side, and each cooling unit body includes airflow passages arranged side by side in parallel, that is, the dry passage 17 and the wet passage 17. The channel 18, the dry channel 17 and the wet channel 18 are respectively provided with support plates, that is, the dry channel 17 is provided with a first corrugated plate 20, and both sides of the first corrugated plate 20 are hydrophobic surfaces, that is, The first corrugated plate 20 is a plastic substrate without flocking; the wet channel 18 is provided with a second corrugated plate 25, and both sides of the second corrugated plate 25 are hydrophilic surfaces, that is, the second corrugated plate has two sides Flocked plastic substrate. In addition, the second corrugated plate 25 in the wet channel 18 may have a plurality of small holes to form a grid-shaped corrugated plate to increase the contact area and enhance the heat and mass exchange between the secondary air and the spray water.

The cooling unit bodies stacked side by side are arranged at intervals between the dry channel 17 and the wet channel 18; a channel partition 19 is respectively arranged between the dry channel 17 and the wet channel 18, and the channel partition 19 is made of a plastic plate. One side of the dry channel 17 on the plate 19 is a non-flocked hydrophobic surface, and the side of the channel partition 19 located at the wet channel 18 is a flocked hydrophilic surface; multiple channels in the cooling units stacked side by side are arranged When dividing plate 19, the hydrophobic surface of the adjacent channel dividing plate 19 is opposite to the hydrophobic surface in turn, and the hydrophilic surface is opposite to the hydrophilic surface. The dry channel 17 (primary air channel) is formed between the hydrophobic surfaces of the two channel dividing plates 19. A wet channel 18 (secondary air channel) is formed between the hydrophilic surfaces of the two channel dividing plates 19, so that a dry channel 17 or a wet channel 18 is formed between two adjacent channel dividing plates 19, and The supporting material between two adjacent channel partitions 19 is a corrugated plate with vertical grains, so as not to affect the passage of airflow.

Air enters the dry channel 17 of the dew point indirect evaporative cooler core 16 from the air inlet 1 of the cooler. Since the dry channel 17 and the wet channel 18 are relatively independent, the air entering from the air inlet 1 is prevented from entering the wet channel 18 at the same time . Similarly, the space between the dew point indirect evaporative cooler core 16 and the casing 9 that is not an air flow channel is separated from the dry channel 17, as shown by the thick solid line in Fig. 1, the dew point indirect evaporative cooler core 16 is separated from the machine The spaces between the shells 9 that are not air flow passages are also separated from the wet passage 18, as shown by the thick solid line in FIG. 2 .

The top of the dry passage 17 is provided with a dry passage air inlet 21 communicating with the air inlet 1, and the bottom of the dry passage 17 is provided with a dry passage air outlet 22 communicating with the primary air supply port 5; The top of the wet channel 18 is provided with a spray water inlet 24 facing the water distributor 10, and the top of the wet channel 18 is also provided with an inlet to the exhaust fan 8 at the secondary air outlet 7. The wet channel air outlet 26 connected to the tuyere; the bottom of the wet channel 18 is provided with a wet channel air inlet 23; 23 separated tuyere partitions 15, the tuyere partitions 15 are provided with a plurality of diversion holes 4, part of the primary air 3 in the dry channel 17 enters the wet channel 18 through the diversion holes 4; the water collection tank 14 is located at the tuyere The side of the wet passage air inlet 23 of the partition 15 .

As shown in Figure 1, the cross-sectional structural schematic diagram of the dry channel 17 (i.e. the primary air channel) of the utility model cooler, inside the cooler, the air enters the dry channel 17 arranged at intervals from the air inlet 1 provided on the top of the casing 9 It is the primary air 3, which runs downward in the dry channel 17, part of the primary air 3 is discharged from the dry channel air outlet 22 at the lower part of the cooler, and sent into the room through the connected primary air supply port 5, and the remaining part of the primary air After the air 3 flows to the bottom of the cooler, it enters the wet channel 18 from the wet channel air inlet 23 through the split hole 4 arranged on the tuyere partition 15 at the lower part of the cooler core 16, and flows upward in the wet channel 18 as the secondary air 6. Operation, as shown in Figure 2, the bottom-up secondary air 6 in the wet channel 18 and the top-down primary air 3 in the dry channel 17 flow in opposite directions in the main section of the cooler, thereby increasing the sensible heat exchange efficiency . At the same time, a water distributor 10 is arranged above the cooler core 16, and the water collecting tank 14 arranged below the cooler core 16 supplies the water distributor 10 with the water in the water collecting tank 14 circulating through the circulating water pump 13. The spray water of the water tank 10 is evenly sprayed in the wet channel 18 of the cooler from top to bottom through the spray water inlet 24, and the spray water flows from top to bottom in the wet channel 18 and flows from the wet channel 18. The bottom-up secondary air 6 also forms a reverse flow to increase the heat and moisture exchange efficiency. After the temperature and moisture content of the secondary air 6 increase, the secondary air 6 passes through the secondary air through the exhaust fan 8 on the upper part of the cooler. The exhaust outlet 7 is discharged to the outside, and a water barrier 11 is preferably installed in front of the secondary air exhaust outlet 7 to prevent the spray water of the water distributor 10 from being discharged with the secondary air 6, so as to avoid affecting the operation of the exhaust fan 8 . The spray water flows into the water collecting tank 14 after flowing to the bottom of the cooler, and can continue to be circulated by the circulating water pump 13. Along with the continuous reduction of primary air 3 temperature in the dry channel 17, a part of primary air 3 constantly enters the wet channel 18 through the split hole 4 and becomes the secondary air 6, so the wet bulb temperature of the secondary air 6 of the wet channel 18 also increases. After the sensible heat exchange between the secondary air 6 in the wet channel 18 and the primary air 3 in the dry channel 17, the temperature of the primary air 3 also decreases gradually, approaching the dew point temperature of the intake air. In the cooling process of the utility model, the primary air 3 and the secondary air 6, the secondary air 6 and the spray water all realize the reverse flow, which increases the heat exchange temperature difference to the greatest extent and improves the efficiency of the cooler, so that what enters the room is Cooler air, between the wet bulb temperature and the dew point temperature.

The structure of the channel partition for the counterflow plate dew point indirect evaporative cooler with the above-mentioned external shunt structure is to use plastic flocking material as the channel partition material. One side of the plastic substrate is flocked to obtain a channel partition with one side being hydrophobic and the other side being hydrophilic; electrostatic flocking is carried out on one side of the plastic substrate to make the fluff (nylon, viscose, acrylic, rayon, etc.) Charge, the substrate that needs to be flocked (PET, PVC, PP, PS, ABS and other rigid plastic sheets) is coated with adhesive, placed under zero potential or grounding conditions, the fluff is attracted by the different potential, and is vertically stuck to the quilt On the plant base material, the evaporation heat exchange side is formed after absorbing water. The fluff is a water-absorbing material, while the plastic substrate is a hydrophobic material. The electrostatic flocking process is different from the ordinary pasting or hot-pressing lamination method, and will not change the water-absorbing performance of the fluff. Therefore, the water-absorbing surface of the channel partition is good; The thickness of the channel partition 19 is 0.1-0.4 mm, and its heat conduction effect is good. The evaporation performance and heat conduction performance of the above-mentioned channel partition material are improved after absorbing water, so that the heat exchange performance of the entire plate dew point indirect evaporative cooler is improved.

Although the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the utility model, many deformations can be made without departing from the purpose of the utility model, and these all belong to the protection of the utility model.

Claims (5)

1. the board-like dew point indirect evaporative cooler of the adverse current of external flow dividing structure, comprises casing (9) and is arranged on the dew point indirect evaporative cooler core body (16) in casing (9), it is characterized in that:

Described casing (9) top is provided with air inlet (1), auxiliary air exhaust outlet (7) and water-locator (10), the bottom of described casing (9) is provided with the header tank (14) of upper shed, water circulating pump (13) and primary air air outlet (5), described air inlet (1) place is provided with pressure fan (2), described primary air air outlet (5) is communicated with indoor, described auxiliary air exhaust outlet (7) place is provided with exhaust blower (8), described auxiliary air exhaust outlet (7) is communicated with outdoor, feed pipe (12) is connected with through water circulating pump (13) to water-locator (10) from described header tank (14),

Described dew point indirect evaporative cooler core body (16) is made up of more than 1 cooling unit body stacked side by side, each cooling unit body comprises dry passage (17) and the wet channel (18) of side by side parallel layout, and cooling unit body stacked side by side is that dry passage (17) and wet channel (18) interval are arranged; A channel partition (19) is provided with respectively between dry passage (17) and wet channel (18), the one side described channel partition (19) being positioned at dry passage (17) is hydrophobic surface, the one side described channel partition (19) being positioned at wet channel (18) is hydrophilic surface, first wave card (20) is provided with in described dry passage (17), the two sides of described first wave card (20) is hydrophobic surface, be provided with Second Wave card (25) in described wet channel (18), the two sides of described Second Wave card (25) is hydrophilic surface;

The top of described dry passage (17) is provided with the dry passage air inlet (21) be communicated with described air inlet (1), and the bottom of described dry passage (17) is provided with the dry passage air outlet (22) be communicated with described primary air air outlet (5);

The top of described wet channel (18) is provided with the shower water entrance (24) just right with described water-locator (10), the top of described wet channel (18) is also provided with the wet channel air outlet (26) be connected with described auxiliary air exhaust outlet (7), and the bottom of described wet channel (18) is provided with wet channel air inlet (23);

The below of described dew point indirect evaporative cooler core body (16) arranges the air port dividing plate (15) being used for dry passage air outlet (22) and wet channel air inlet (23) to separate, described air port dividing plate (15) is provided with multiple tap hole (4), by tap hole (4) after partial air in described dry passage (17) flows out from dry passage air outlet (22), enter wet channel (18) by wet channel air inlet (26), form the auxiliary air (6) upwards flowed; Primary air (3) in the described dry passage of described dew point indirect evaporative cooler core body (16) (17) and the auxiliary air (6) in wet channel (18) vertically countercurrent flow in cooler; Described header tank (14) is positioned at the side of the wet channel air inlet of air port dividing plate (15), shower water flows into wet channel (18) from top to bottom through water-locator (10), finally enter in header tank (14), the auxiliary air (6) in described wet channel (18) and the shower water of described water-locator (10) vertically countercurrent flow in cooler.

2. the board-like dew point indirect evaporative cooler of the adverse current of external flow dividing structure according to claim 1, it is characterized in that, described wet channel air outlet (26) place is provided with water fender (11).

3. the board-like dew point indirect evaporative cooler of the adverse current of external flow dividing structure according to claim 1, it is characterized in that, described hydrophobic surface is formed by by plastic basis material surface, and described hydrophilic surface is made up of the flocked surface on plastic basis material.

4. the board-like dew point indirect evaporative cooler of the adverse current of external flow dividing structure according to claim 1, it is characterized in that, described Second Wave card (25) is grid type corrugated plating.

5. the channel partition for the board-like dew point indirect evaporative cooler of adverse current as external flow dividing structure as described in arbitrary in Claims 1-4, it is characterized in that, this channel partition comprises plastic base, the one side flocking of described plastic base, and the thickness of described channel partition is 0.1 ~ 0.4mm.