CN104534603B - The board-like dew point indirect evaporative cooler of adverse current and channel partition of built-in flow dividing structure - Google Patents

Abstract

The invention discloses a counterflow plate type dew point indirect evaporative cooler with a built-in shunt structure, which comprises a core body of the dew point indirect evaporative cooler arranged in a casing, an air inlet and a secondary air exhaust port are arranged on the top of the casing, and the bottom of the casing is There is a primary air supply port; the core body of the dew point indirect evaporative cooler is composed of several dry channels and wet channels arranged side by side in parallel and at intervals; there is a channel partition between the dry channel and the wet channel, and the partition is located in the dry channel. The side of the partition is the hydrophobic surface, and the side located in the wet channel is the hydrophilic surface; the lower part of the partition is provided with a distribution hole, and part of the air in the dry channel enters the wet channel through the distribution hole, and runs in the wet channel as secondary air. Air and secondary air counterflow; at the same time, the channel partition of the cooler core in the present invention includes a plastic substrate, and one side of the substrate is flocked with electrostatic flocking technology, thereby obtaining a partition that is hydrophobic on one side and hydrophilic on the other. , The thickness of the separator is 0.1-0.4mm.

Description

Counterflow plate dew point indirect evaporative cooler with built-in shunt structure and channel partition

technical field

The invention belongs to the technical field of air-conditioning and refrigeration equipment, and in particular relates to an improved dew point indirect evaporative cooler in the form of 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.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a counter-flow plate dew-point indirect evaporative cooler with a built-in diversion structure. The present invention makes the primary air in the dry channel and the secondary air in the wet channel, the secondary air in the wet channel The water realizes countercurrent heat exchange in the vertical direction of the main body in the cooler, increases the heat transfer temperature difference, improves the heat and mass transfer driving potential, improves the cooling efficiency of the cooler, and can reduce the internal resistance of the cooler. At the same time, the channel partition of the cooler core in the present invention uses plastic as the base material, and uses a plane electrostatic flocking process to flock one side of the base material, which improves the evaporation performance and thermal conductivity after water absorption, thereby Improve the heat transfer performance of the entire plate dew point indirect evaporative cooler.

In order to solve the above technical problems, the present invention proposes a counter-flow plate dew-point indirect evaporative cooler with a built-in diversion structure, which includes a casing and a core of the dew-point indirect evaporative cooler arranged in the casing. Air outlet, secondary air exhaust outlet and water distributor. The bottom of the casing is provided with an upper opening water collection tank, a circulating water pump and a primary air supply port. The air inlet is provided with a blower. The primary air supply port and Indoor communication, 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 dew point is indirectly The evaporative cooler core 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 cooling units stacked side by side are arranged at intervals between dry channels and wet channels; dry channels A channel partition is respectively arranged between the channel partition and the wet channel. The side of the channel partition located in the dry channel is a hydrophobic surface, and the side of the channel partition located in the wet channel is a hydrophilic surface. A first corrugated plate is provided, both sides of the first corrugated plate are hydrophobic surfaces, a second corrugated plate is arranged in the wet channel, and both sides of the second corrugated plate are hydrophilic surfaces; the dry channel The top of the dry channel is provided with a dry channel air inlet connected with the air inlet, and the bottom of the dry channel is provided with a dry channel air outlet connected with the primary air supply port; the top of the wet channel is provided with the cloth The spray water inlet facing the water device, the top of the wet channel is also provided with a wet channel air outlet connected to the secondary air outlet; the lower part of the channel partition is provided with a branch flow hole, the After part of the primary air in the dry channel flows to the bottom of the cooler core, it enters the wet channel through the split hole to form secondary air that flows upward; the primary air in the dry channel of the dew point indirect evaporative cooler core and The secondary air in the wet channel exchanges heat vertically in countercurrent in the cooler; the secondary air in the wet channel and the spray water of the water distributor exchange heat in vertical countercurrent in the cooler.

When the counterflow plate dew point indirect evaporative cooler with built-in flow distribution structure of the present invention is working, inside the cooler, the air enters the dry channels arranged at intervals from the air inlet on the upper part to form primary air running downward, and part of the primary air flows from the lower part of the cooler It is discharged from the air outlet of the dry channel and sent into the room through the connected primary air supply port. There are a certain number of distribution holes in the lower part of the heat exchange partition between the primary air passage and the secondary air passage. After the primary air in part of the dry passage flows to the bottom of the cooler, it enters the wet passage through the distribution passages to form The secondary air running upwards in the wet channel, the bottom-up secondary air in the wet channel and the top-down primary air in the dry channel flow in reverse directions 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.

A channel partition for the above-mentioned counter-flow plate dew-point indirect evaporative cooler with a built-in shunt structure proposed in the present invention 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 prior art, the beneficial effect of the present invention is:

(1) The present invention 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) In the present invention, the plastic flocking composite material is used for the channel partition of the cooler core for the first time, and the fluff is uniformly adhered to the plastic substrate by using an electrostatic flocking process. 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 in the present invention 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 air intake The dew point temperature of the 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 countercurrent plate cooler of the present invention 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 cooler main body, The heat exchange efficiency of the cooler is improved. 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 built-in shunt structure of the present invention;

Fig. 2 is a schematic diagram of the cross-sectional structure of the wet channel of the counterflow plate dew point indirect evaporative cooler with built-in shunt structure of the present invention;

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

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

In the figure: 1-air inlet, 2-supply fan, 3-primary air, 4-distribution hole, 5-primary air supply port, 6-secondary air, 7-secondary air exhaust port, 8-exhaust fan, 9-casing, 10-water distributor, 11-water baffle, 12-water supply pipe, 13-circulating water pump, 14-collecting tank, 15-cooler core, 16-dry channel, 17-wet channel, 18 - channel partition, 19 - first corrugated plate, 20 - second corrugated plate, 21 - dry channel air inlet, 22 - dry channel air outlet, 23 - wet channel air outlet, 24 - spray water inlet.

detailed description

The technical solutions of the present invention 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 with a built-in split structure proposed by the present invention includes a casing 9 and a dew point indirect evaporative cooler core 15 disposed 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 pipe, the secondary air outlet 7 is provided with an exhaust fan 8 connected by an air pipe, and the secondary air outlet 7 communicates with the outdoor , 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 discharge port 7, and the water collecting tank 14 is connected to the water distributor 10 through the circulating water pump 13 Water supply pipe 12.

As shown in Figures 3 and 4, the core 15 of the dew point indirect evaporative cooler is composed of more than one cooling unit body stacked side by side, and each cooling unit body includes air passages arranged side by side in parallel, that is, the dry passage 16 and the wet passage 16. The channel 17, the dry channel 16 and the wet channel 17 are respectively provided with support plates, that is, the dry channel 16 is provided with a first corrugated plate 19, and both sides of the first corrugated plate 19 are hydrophobic surfaces, that is, The first corrugated plate 18 is a plastic plate without flocking; the second corrugated plate 20 is arranged in the wet channel 17, and both sides of the second corrugated plate 20 are hydrophilic surfaces, that is, the second corrugated plate 20 is Plastic substrate flocked on both sides. In addition, the second corrugated plate 20 in the wet channel 17 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 16 and the wet channel 17; a channel partition 18 is respectively arranged between the dry channel 16 and the wet channel 17, and the channel partition 18 is made of a plastic plate. One side of the dry channel 16 on the plate 18 is a non-flocked hydrophobic surface, and the side of the channel partition 18 located at the wet channel 17 is a flocked hydrophilic surface; multiple channels in the cooling units stacked side by side are arranged In the case of partitions 18, the hydrophobic surface of the adjacent channel partitions 18 is opposed to the hydrophobic surface, and the hydrophilic surface is opposite to the hydrophilic surface. The dry passage 16 (primary air passage) is formed between the hydrophobic surfaces of the two passage partitions 18. A wet channel 17 (secondary air channel) is formed between the hydrophilic surfaces of the two channel dividing plates 18 oppositely arranged, thereby forming a dry channel 16 or a wet channel 17 between two adjacent channel dividing plates 18, and The supporting material between two adjacent channel partitions 18 is a corrugated plate with vertical grains, so as not to affect the passage of airflow.

Air enters the dry channel 16 of the dew point indirect evaporative cooler core 15 from the air inlet 1 of the cooler. Since the dry channel 16 and the wet channel 17 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 15 and the casing 9 that is not an air flow channel is separated from the dry channel 16, as shown by the thick solid line in Figure 1, the dew point indirect evaporative cooler core 15 is separated from the machine The spaces between the shells 9 that are not air flow passages are also separated from the wet passage 17, as shown by the thick solid line in FIG. 2 .

The top of the dry passage 16 is provided with a dry passage air inlet 21 communicating with the air inlet 1, and the bottom of the dry passage 16 is provided with a dry passage air outlet 22 communicating with the primary air supply port 5; The lower part of the channel partition 18 is provided with a distribution hole 4 through which part of the primary air 3 in the dry channel 16 enters the wet channel 17 . The top of the wet channel 17 is provided with a spray water inlet 24 facing the water distributor 10, and the top of the wet channel 17 is also provided with an exhaust fan 8 at the secondary air outlet 7. The wet channel air outlet 23 that is connected to the air inlet of the air inlet.

As shown in Figure 1, the schematic cross-sectional structure diagram of cooler dry passage 16 (i.e. primary air passage) of the present invention, inside cooler, air enters from the air inlet 1 that casing 9 top is arranged into the dry passage 16 that is arranged at intervals downward In operation, part of the air is discharged from the dry channel air outlet 22 at the lower part of the cooler, and is sent into the room through the connected primary air supply port 5 . A certain number of split flow holes 4 are arranged at the bottom of the channel partition 18 between the dry channel 16 (i.e. the primary air channel) and the wet channel 17 (i.e. the secondary air channel), and the air in the part of the dry channel 16 flows to the cooling system. After the bottom of the device, it enters the wet channel 17 through the branch flow hole 4 on the channel partition 18, and runs upward in the wet channel 17 as the secondary air 6. As shown in Figure 2, the bottom-up secondary air in the wet channel 17 The air 6 and the primary air 3 from top to bottom in the dry channel 16 flow in the opposite direction in the main section of the cooler to increase the sensible heat exchange efficiency. A water distributor 10 is arranged above the cooler core 15, and a water collecting tank 14 arranged below the cooler core 15 supplies the water in the water collecting tank 14 to the water distributor 10 and the water distributor through a circulating water pump 13. The spray water of 10 is evenly sprayed in the wet channel 17 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 17 and flows from bottom to bottom in the wet channel 17. The secondary air 6 above 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 is exhausted through the secondary air through the exhaust fan 8 on the upper part of the cooler. The port 7 is discharged to the outside, and a water baffle 11 is preferably provided in front of the secondary air exhaust port 7 to prevent the spray water of the water distributor 10 from being discharged with the secondary air 6 and 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. As the temperature of the primary air 3 in the dry channel 16 continues to decrease, a part of the primary air 3 continuously passes through the distribution hole 4 and becomes the secondary air 6, so that the wet bulb temperature of the secondary air 6 in the wet channel 17 also continues to increase. After the sensible heat exchange between the secondary air 6 in the wet channel 17 and the primary air 3 in the dry channel 16, the temperature of the primary air 3 also decreases gradually, and can approach the dew point temperature of the intake air. In the cooling process of the present invention, the primary air 3 and the secondary air 6, the secondary air 6 and the spray water all realize reverse flow, which increases the heat transfer temperature difference to the greatest extent, improves the efficiency of the cooler, and makes the temperature entering the room Lower air, between wet bulb temperature and dew point temperature.

The structure of the channel partition for the above-mentioned counterflow plate type dew point indirect evaporative cooler with built-in shunt structure is to use plastic flocking material as the channel partition material. Flocking treatment on one side to obtain a channel partition with one side being hydrophobic and the other side being hydrophilic; electrostatic flocking on one side of the plastic substrate to charge the fluff (nylon, viscose, acrylic, rayon, etc.) , the substrate that needs to be flocked (PET, PVC, PP, PS, ABS and other hard 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 plant On the base material, the heat exchange side is formed after absorbing water and evaporating. 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 18 is 0.1-0.4mm, 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 present invention has been described above in conjunction with the accompanying drawings, the present invention 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 present invention, many modifications can be made without departing from the gist of the present invention, and these all belong to the protection of the present invention.

Claims (4)

1. a kind of board-like dew point indirect evaporative cooler of adverse current of built-in flow dividing structure, including casing (9) and it is arranged on casing (9) Interior dew point indirect evaporative cooler core body (15), it is characterised in that：

Air inlet (1), auxiliary air exhaust outlet (7) and water-locator (10) are provided with the top of the casing (9), the casing (9) Bottom is provided with upper opening type header tank (14), water circulating pump (13) and primary air air outlet (5), and air inlet (1) place is set There is pressure fan (2), the primary air air outlet (5) connects with interior, and auxiliary air exhaust outlet (7) place is provided with exhaust blower (8), the auxiliary air exhaust outlet (7) connects with outdoor, from the header tank (14) by water circulating pump (13) to water-locator (10) it is connected with feed pipe (12)；

The dew point indirect evaporative cooler core body (15) is made up of more than 1 cooling unit body stacked side by side, each cooling Cell cube includes the dry passage (16) and wet channel (17) that side by side parallel is arranged, cooling unit body stacked side by side is in dry passage And wet channel (17) arranged for interval (16)；Respectively provided with a channel partition between dry passage (16) and wet channel (17) (18), the one side on the channel partition (18) positioned at dry passage (16) is positioned at wet on hydrophobic surface, the channel partition (18) The one side of passage (17) is that the first corrugated plating (19), first corrugated plating (19) are provided with hydrophilic surface, the dry passage (16) Two sides be hydrophobic surface, the second corrugated plating (20), the two sides of second corrugated plating (20) are provided with the wet channel (17) It is hydrophilic surface；

The top of the dry passage (16) is provided with the dry passage air inlet (21) connected with the air inlet (1), the dry passage (16) bottom is provided with the dry passage air outlet (22) connected with the primary air air outlet (5)；

The top of the wet channel (17) be provided with the water-locator (10) just to spray water inlet (24), the wet channel (17) the wet channel air outlet (23) being connected with the auxiliary air exhaust outlet (7) is additionally provided with the top of；

The bottom of the channel partition (18) is provided with part primary air (3) stream shunted in through hole (4), the dry passage (16) To after cooler core (15) bottom, wet channel (17) is entered by the shunting through hole (4) and forms flow up secondary afterwards Air (6)；

Two in primary air (3) and wet channel (17) in dew point indirect evaporative cooler core body (15) dry passage (16) Secondary air (6) vertically countercurrent flow in cooler；Auxiliary air (6) and the water distribution in the wet channel (17) The shower water of device (10) vertically countercurrent flow in cooler.

2. the board-like dew point indirect evaporative cooler of the adverse current of built-in flow dividing structure according to claim 1, it is characterised in that institute Wet channel air outlet (23) place is stated provided with water fender (11).

3. the board-like dew point indirect evaporative cooler of the adverse current of built-in flow dividing structure according to claim 1, it is characterised in that institute State hydrophobic surface to be made up of plastic basis material surface, the 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 built-in flow dividing structure according to claim 1, it is characterised in that institute The second corrugated plating (20) is stated for grid type corrugated plating.