Water film reconstruction tubular evaporative cooler

Abstract

The present invention provides a water film reconstruction tubular evaporative cooler, comprising a water distribution system, a water film reconstruction system, a heat exchange coil, a water film reconstruction system bracket, a heat exchange coil bracket and safety accessories. The water distribution system comprises a water suction port, a water pump, a first water distributor, a second water distributor, a third water distributor and a water storage tank. The water film reconstruction system comprises an initial water film forming device, a first water film reconstruction device and a second water film reconstruction device. The heat exchange coil is composed of a plurality of groups of parallel unit coils. The initial water film forming device, the first water film reconstruction device and the second water film reconstruction device are vertically arranged in sequence in the height direction of the unit coil. Spray water is sprayed out by the first water distributor, passes through the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device, and forms a uniform and complete water film on the surface of the water film reconstruction tubular evaporative cooler to achieve efficient heat exchange.

Description

Technical Field

[0001] The invention provides a water film reconstruction tubular evaporative cooler, which belongs to the field of heat exchangers and aims to solve the problem of low heat exchange efficiency caused by poor uniformity and integrity of water film on the surface of the evaporative cooler under high-speed airflow. Background Art

[0002] Existing evaporative coolers mostly distribute water on the top of the heat exchange coil. Due to the effects of surface tension and viscosity, the uniformity and integrity of the water film on the surface of the evaporative cooler are not ideal, and some parts are even dry. In addition, the difference between the saturated air pressure on the water film surface and the water vapor partial pressure in the mainstream air is the driving force for the heat and mass transfer process of the evaporative cooler. When a water film is formed on the surface of the evaporative cooler using the traditional water distribution method, most of the water droplets directly interact with the air, causing the air humidity to increase significantly, that is, the water vapor partial pressure in the air increases, the driving force for heat and mass transfer between the water film and the air is reduced, and the air heat removal capacity is not fully utilized, so the heat transfer efficiency of the evaporative cooler is low.

[0003] In view of the problem of poor uniformity and integrity of the water film on the surface of the existing evaporative cooler, the applicant's research group proposed to use the "evaporative water replenisher (ZL2009103003918)" to distribute water on the side of the heat exchanger, which significantly improved the uniformity and integrity of the water film and increased the driving force of mass transfer. However, since the evaporative water replenisher uses the reaction force of water droplets ejected from the nozzle at high speed to drive the device to rotate automatically, the pressure and air volume of the compressed air are very large, and the air pressure is much greater than the pressure required for spraying, resulting in a sharp increase in the power of the air compressor and serious energy waste. What is more serious is that the rotating body of the water distribution device is mounted on the water inlet channel, and the rotating body and the outer wall of the water inlet channel form a cavity, and the rotating body is supported by bearings. Therefore, the friction between the moving parts and the stationary parts of the device, the sealing and the driving force of the device constitute a series of mutually restrictive problems: 1) If good sealing is required, the friction of the device will increase sharply, and the power required to drive the device to rotate will also increase sharply, and the power of the air compressor will increase sharply; 2) If poor sealing is required, the leakage will be serious, a large amount of compressed air will be wasted, and the motor power required by the compressor will also increase; 3) Tiny impurities in water or compressed air or fine metal chips generated during the rotation of the device can easily get stuck in the gap between the moving parts and the stationary parts, causing the device to stop rotating frequently, resulting in the heat exchanger being unable to discharge heat and affecting the safety of the unit; 4) Leakage of the water distributor will cause the lubricating oil of the bearing to splash onto the surface of the heat exchanger, seriously weakening the uniformity and integrity of the water film; 5) The premature contact between compressed air and water causes air to leak from the water tank side, and the water is pressed back into the water tank, so the water pump pressure has to be increased to a level close to the compressed air pressure, which is far greater than the economic pressure required for atomization.

[0004] In response to the above problems, the applicant proposed to use an electric motor to provide rotational power to solve the above problems such as high energy consumption and unstable operation, and based on this solution, developed a series of equipment technologies such as "rotary water distributor (ZL2011103411312)", "air atomization distribution device of rotary water distributor on both sides (ZL2013201382945)", "pressure atomization distribution device of rotary water distributor on both sides (ZL2013201382945)" and "indirect evaporative cooler with rotary water distribution on both sides (ZL2013201383026)". This series of technologies solves all the problems of "evaporative water replenisher (ZL2009103003918)". Compared with the existing evaporative cooler, the performance is improved by about 80%. However, the utilization rate of air heat removal capacity has a limit value lower than the research expectation. After this limit value, no matter how the water film performance is strengthened, the heat exchange efficiency will no longer be improved, and in some cases it will even decrease (National Natural Science Foundation Project: 51406015). The reasons are: 1. While water distribution on both sides significantly improves the water film performance and strengthens the heat exchange between the water film and the wall, the spraying water droplets still weaken the latent heat exchange capacity of the air to a certain extent. Some of the atomized droplets directly exchange heat and mass with the air and do not participate in removing the heat of the high-temperature medium inside the evaporative cooler. The heat removal capacity of the air cannot be maximized; 2. The heat transfer coefficient between the water film and the wall is too small, and the heat exchange between the water film and the wall needs to be further strengthened.

[0005] In view of the excellent heat exchange performance of the "indirect evaporative cooler with rotating water distribution on both sides (ZL2013201383026)", the research team installed the equipment in the underground exhaust tunnel of the subway station air conditioner to solve the engineering problem of finding a location on the ground that meets the requirements of the cooling tower and is coordinated with the surrounding environment during subway construction. At the same time, it recovers the energy of the subway station air conditioning exhaust, reduces the initial investment in subway station construction and the operating energy consumption of the air conditioning system. The study found that when the equipment is used in the air conditioning system of the subway underground project, its heat exchange performance is much lower than that of other air conditioning projects. The error of medium and large evaporative coolers is particularly significant. The existing technology of the equipment is not suitable for subway underground air conditioning projects. The main reasons for this problem are: 1. The air velocity in the subway exhaust tunnel is much greater than the air velocity of the current evaporative cooler. The uniformity and integrity of the water film on the surface of the evaporative cooler under high-speed airflow is much lower than the uniformity and integrity of the water film at the conventional airflow velocity; 2. In order not to increase the resistance of the subway station exhaust system, the applicant slightly Increasing the coil spacing further aggravates the unevenness of the water film on the surface of the evaporative cooler, and at the same time the water floating phenomenon becomes more serious. The heat and mass transfer capacity of the water film and the air is seriously weakened, and the utilization rate of the air's heat dissipation capacity is low. If the coil spacing is not increased, the energy consumption of the station exhaust system will increase significantly; 3. The water film distribution in the height direction of the evaporative cooler coil is particularly uneven. After a certain height of the evaporative cooler coil, the water film on the coil surface is distributed linearly and the flow rate is extremely low. The heat exchange coefficient between the water film and the air is low, and the heat of the high-temperature medium inside the evaporative cooler cannot be efficiently discharged, so the heat exchanger performance is low.

[0006] Therefore, under high-speed airflow, how to form a uniform and complete water film on the surface of the evaporative cooler without causing water floating problems and maximize the heat transfer coefficient between the water film and the surface of the evaporative cooler is the key to ensuring that the evaporative cooler achieves efficient heat exchange under high-speed airflow conditions. Summary of the invention

[0007] The present invention aims to propose a water film reconstruction tubular evaporative cooler to solve the above problems, specifically:

[0008] The water film reconstruction tubular evaporative cooler comprises a water distribution system, a water film reconstruction system, a heat exchange coil, a water film reconstruction system bracket, a heat exchange coil bracket and safety accessories. The water distribution system comprises a water inlet, a water pump, a first water distributor, a second water distributor, a third water distributor and a water storage tank, wherein the first water distributor, the second water distributor and the third water distributor are arranged in parallel. The water film reconstruction system comprises an initial water film forming device, a first water film reconstruction device and a second water film reconstruction device, wherein the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device are arranged in parallel. The initial water film forming device, the first water film reconstruction device and the second water film reconstruction device can adopt a plate-type structure water film reconstruction system and a trough-type structure water film reconstruction system. The heat exchange coil is composed of a plurality of parallel unit coils, and the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device are arranged vertically in sequence in the height direction of the unit coils. A film forming device, a first water film reconstruction device, a second water film reconstruction device, and a liquid distribution pipe and a liquid collecting pipe are respectively arranged at the inlet and outlet of the unit coil arranged in parallel. The liquid distribution pipe and the liquid collecting pipe are connected to the unit coil through a liquid distribution joint and a liquid collecting joint respectively. The water film reconstruction system bracket includes a left bracket, a right bracket, a front guide rail and a rear guide rail. The left end, right end, front end and rear end of the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device are respectively connected to the left bracket, the right bracket, the front guide rail and the rear guide rail. The high-temperature medium enters the unit coil arranged in parallel from the liquid distribution pipe, merges and flows out from the liquid collecting pipe, and the spray water is sprayed by the first water distributor, passes through the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device, and forms a uniform and complete water film on the surface of the water film reconstruction tubular evaporative cooler to achieve efficient heat exchange.

[0009] Furthermore, the second water distributor and the third water distributor determine the setting height, opening cycle and water distribution amount according to the load borne by the water film reconstruction evaporative cooler.

[0010] Furthermore, the first water film reconstruction device and the second water film reconstruction device determine the setting height, the width of the first water film reconstruction outlet and the second water film reconstruction outlet according to the load borne by the water film reconstruction evaporative cooler.

[0011] Furthermore, the plate-type structure water film reconstruction system is composed of a plurality of water distribution troughs arranged in parallel, the number of which is the same as the number of unit coils, and each water distribution trough is provided with a plate-type water collection trough with the center line of the unit coil as the axis of symmetry and sloping toward the unit coil, and a plate-type water outlet is provided between the plate-type water collection trough and the unit coil.

[0012] Furthermore, the trough-type structure water film reconstruction system is composed of a left water distribution trough and a right water distribution trough which are arranged in parallel. The front end and the rear end of the left water distribution trough and the right water distribution trough are respectively connected to the front guide rail and the rear guide rail. A trough-type water collection trough with the center line of the unit coil as the axis of symmetry and sloped toward the unit coil is arranged on the left water distribution trough and the right water distribution trough, and a trough-type water outlet is arranged between the trough-type water collection trough and the unit coil.

[0013] The main innovative features of the present invention are:

[0014] Based on the load borne by the water film reconstruction tubular evaporative cooler and the formation, development and evolution of the uniformity, integrity, flow rate and thickness of the water film in the coil height direction, an initial water film forming device is used to form a uniform water film on the surface of the water film reconstruction tubular evaporative cooler. When the water film develops to be not uniform enough, the water film is reconstructed for the first time by the first water film reconstruction device. When the water film develops to be not uniform enough again, the second water film reconstruction device is used to form a uniform water film for the second time in the coil height direction, ensuring that the water film in the coil height direction of the water film reconstruction tubular evaporative cooler always remains uniform and complete.

[0015] During the reconstruction of the water film, the setting height, opening cycle and water distribution amount of the second and third water distributors are determined based on the allowable water film temperature fluctuation range of the load borne by the water film reconstruction tubular evaporative cooler to maximize the use of the air's heat removal capacity.

[0016] During the reconstruction of the water film, the initial water film speeds of the initial water film forming device, the first water film reconstruction device and the second water film reconstruction device are optimized, and the water film speeds are optimized based on the uniformity and integrity indicators of the water film to maximize the heat transfer coefficient between the water film and the wall.

[0017] The main advantages of the present invention are:

[0018] Under high-speed airflow, a uniform and complete water film is formed on the surface of the water film reconstruction tubular evaporative cooler to maximize the heat exchange coefficient between the water film and the wall and maximize the heat removal capacity of the water film and air.

[0019] The invention solves the engineering problem that it is difficult to find a location on the ground that meets the requirements for cooling tower installation and is coordinated with the surrounding environment to install cooling towers in underground projects such as subway projects, and provides a feasible exhaust treatment solution and equipment for realizing the "invisibility" of underground military buildings.

[0020] Recycle the energy of air conditioning exhaust in underground buildings such as subways to reduce the initial investment and operating energy consumption of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic front view of a water film reconstruction plate type evaporative cooler according to the first embodiment of the present invention;

[0022] Figure 2 It is a top view schematic diagram of a water film reconstruction plate type evaporative cooler according to the first embodiment of the present invention;

[0023] Figure 3 It is a top view schematic diagram of a water film reconstruction plate type evaporative cooler according to the second embodiment of the present invention;

[0024] Figure 4This is a schematic structural diagram of a water film reconstruction plate type evaporative cooler according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0025] The water film reconstruction tubular evaporative cooler of the present invention is further described in conjunction with the accompanying drawings:

[0026] Example 1: Using a plate-type water film reconstruction system to illustrate the specific implementation of a water film reconstruction tube evaporative cooler, see Figure 1 and Figure 2 .

[0027] A water film reconstruction tubular evaporative cooler comprises a water distribution system, a water film reconstruction system, a heat exchange coil, a water film reconstruction system bracket, a heat exchange coil bracket and safety accessories. The water distribution system comprises a water inlet 1, a water pump 2, a first water distributor 3, a second water distributor 4, a third water distributor 5 and a water storage tank 6, wherein the first water distributor 3, the second water distributor 4 and the third water distributor 5 are arranged in parallel. The water film reconstruction system comprises an initial water film forming device 12, a first water film reconstruction device 13 and a second water film reconstruction device 14, wherein the initial water film forming device 12, the first water film reconstruction device 13 and the second water film reconstruction device 14 are arranged in parallel. The initial water film forming device 12, the first water film reconstruction device 13 and the second water film reconstruction device 14 can adopt a plate-type structure water film reconstruction system. The heat exchange coil is composed of a plurality of groups of parallel unit coils 9. The initial water film forming device 12, the first water film reconstruction device 13 and the second water film reconstruction device 14 are arranged vertically in sequence in the height direction of the unit coils 9. The membrane reconstruction device 13, the second water film reconstruction device 14, and the inlet and outlet of the unit coil 9 arranged in parallel are respectively provided with a liquid distribution pipe 7 and a liquid collecting pipe 8, and the liquid distribution pipe 7 and the liquid collecting pipe 8 are connected to the unit coil 9 through a liquid distribution joint 10 and a liquid collecting joint 18 respectively. The water film reconstruction system bracket includes a left bracket 15, a right bracket 16, a front guide rail 27 and a rear guide rail 17. The left end, right end, front end and rear end of the initial water film forming device 12, the first water film reconstruction device 13 and the second water film reconstruction device 14 are respectively connected to the left bracket 15, the right bracket 16, the front guide rail 27 and the rear guide rail 17. The high-temperature medium enters the unit coil arranged in parallel from the liquid distribution pipe 7, merges and flows out from the liquid collecting pipe 8, and the spray water is sprayed by the first water distributor 3, passes through the initial water film forming device 12, the first water film reconstruction device 13, and the second water film reconstruction device 14, to form a uniform and complete water film on the surface of the water film reconstruction tubular evaporative cooler.

[0028] Based on the load borne by the water film reconstruction tubular evaporative cooler and the formation, development and evolution of the uniformity, integrity, flow rate and thickness of the water film in the coil height direction, an initial water film forming device is used to form a uniform water film on the surface of the water film reconstruction tubular evaporative cooler. When the water film develops to be not uniform enough, the water film is reconstructed for the first time by the first water film reconstruction device. When the water film develops to be not uniform enough again, the second water film reconstruction device is used to form a uniform water film for the second time in the coil height direction, ensuring that the water film in the coil height direction of the water film reconstruction tubular evaporative cooler always remains uniform and complete.

[0029] The second water distributor 4 and the third water distributor 5 determine the setting height, opening cycle and water distribution amount according to the load borne by the water film reconstruction evaporative cooler.

[0030] The first water film reconstruction device 13 and the second water film reconstruction device 14 determine the installation height, the width of the first water film reconstruction outlet 25 and the width of the second water film reconstruction outlet 26 according to the load borne by the water film reconstruction evaporative cooler.

[0031] The plate-type structure water film reconstruction system is composed of a plurality of water distribution troughs 28 arranged in parallel. The number of the water distribution troughs 28 is the same as the number of the unit coils 9. A plate-type water collection trough 19 with the center line of the unit coil 9 as the axis of symmetry and sloping toward the unit coil 9 is arranged on each water distribution trough 28. A plate-type water outlet 30 is arranged between the plate-type water collection trough 19 and the unit coil 9.

[0032] Example 2: A specific implementation method of a water film reconstruction tubular evaporative cooler is described using a trough structure water film reconstruction system. Figure 3 and Figure 4 .

[0033] On the basis of Example 1, Example 2 using a trough structure water film reconstruction system can be adopted. The key difference between Example 2 and Example 1 lies in the trough structure water film reconstruction system adopted by the initial water film forming device 12, the first water film reconstruction device 13, and the second water film reconstruction device 14. As shown in the accompanying drawings, the trough structure water film reconstruction system is composed of a left water distribution trough 150 and a right water distribution trough 160 arranged in parallel. The front end and the rear end of the left water distribution trough 150 and the right water distribution trough 160 are respectively connected to the front guide rail 27 and the rear guide rail 17. The left water distribution trough 150 and the right water distribution trough 160 are provided with a trough-type water collection trough 20 with the center line of the unit coil 9 as the axis of symmetry and inclined toward the unit coil 9, and a trough-type water outlet 29 is provided between the trough-type water collection trough 20 and the unit coil 9.

[0034] Example 3: The specific implementation method of the water film reconstruction tubular evaporative cooler is described by combining the trough structure water film reconstruction system and the plate structure water film reconstruction system.

[0035] Embodiment 1 and Embodiment 2 list the technical solutions of the water film reconstruction system using a trough structure water film reconstruction system or a plate structure water film reconstruction system. In actual engineering, the water film reconstruction system can also use a technical solution of the combined application of a trough structure water film reconstruction system and a plate structure water film reconstruction system, which are briefly listed as follows: 1. The initial water film forming device 12 adopts a plate structure water film reconstruction system, and the first water film reconstruction device 13 and the second water film reconstruction device 14 adopt a trough structure water film reconstruction system. 2. The initial water film forming device 12 adopts a trough structure water film reconstruction system, the first water film reconstruction device 13 adopts a plate structure water film reconstruction system, and the second water film reconstruction device 14 adopts a trough structure water film reconstruction system. 3. The initial water film forming device 12 adopts a plate structure water film reconstruction system, the first water film reconstruction device 13 adopts a trough structure water film reconstruction system, and the second water film reconstruction device 14 adopts a plate structure water film reconstruction system.

[0036] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A water film reconstruction tubular evaporative cooler, comprising a water distribution system, a water film reconstruction system, a heat exchange coil, a water film reconstruction system bracket, a heat exchange coil bracket and safety accessories, characterized in that: The water distribution system comprises a water inlet (1), a water pump (2), a first water distributor (3), a second water distributor (4), a third water distributor (5) and a water storage tank (6), wherein the first water distributor (3), the second water distributor (4) and the third water distributor (5) are arranged in parallel. The water film reconstruction system comprises an initial water film forming device (12), a first water film reconstruction device (13) and a second water film reconstruction device (14), wherein the initial water film forming device (12), the first water film reconstruction device (13) and the second water film reconstruction device (14) are arranged in parallel. The initial water film forming device (12), the first water film reconstruction device (13) and the second water film reconstruction device (14) respectively adopt a plate-type structure water film reconstruction system and / or a trough-type structure water film reconstruction system. The heat exchange coil is composed of a plurality of groups of parallel unit coils (9), wherein the initial water film forming device (12), the first water film reconstruction device (13) and the second water film reconstruction device (14) are arranged vertically in sequence in the height direction of the unit coil (9). ), the inlet and outlet of the unit coil (9) arranged in parallel are respectively provided with a liquid distributing pipe (7) and a liquid collecting pipe (8), the liquid distributing pipe (7) and the liquid collecting pipe (8) are respectively connected to the unit coil (9) through a liquid distributing joint (10) and a liquid collecting joint (18), the water film reconstruction system bracket comprises a left bracket (15), a right bracket (16), a front guide rail (27) and a rear guide rail (17), an initial water film forming device (12), a first water film reconstruction device (13), and a second water film reconstruction device The left end, right end, front end and rear end of the device (14) are respectively connected to the left bracket (15), the right bracket (16), the front guide rail (27) and the rear guide rail (17); the high-temperature medium enters the unit coils arranged in parallel through the liquid distribution pipe (7), and flows out through the liquid collection pipe (8); the spray water is sprayed out by the first water distributor (3), passes through the initial water film forming device (12), the first water film reconstruction device (13) and the second water film reconstruction device (14), and forms a water film on the surface of the water film reconstruction tube evaporative cooler.

2. The water film reconstruction tubular evaporative cooler according to claim 1, characterized in that: The second water distributor (4) and the third water distributor (5) determine the setting height, opening cycle and water distribution amount according to the load borne by the water film reconstruction evaporative cooler.

3. The water film reconstruction tubular evaporative cooler according to claim 1, characterized in that: The first water film reconstruction device (13) and the second water film reconstruction device (14) determine the setting height, the width of the first water film reconstruction outlet (25) and the width of the second water film reconstruction outlet (26) according to the load borne by the water film reconstruction evaporative cooler.

4. The water film reconstruction tubular evaporative cooler according to claim 1, characterized in that: The plate-type structure water film reconstruction system is composed of a plurality of water distribution troughs (28) arranged in parallel, the number of the water distribution troughs (28) being the same as the number of the unit coils (9), each water distribution trough (28) being provided with a plate-type water collection trough (19) with the center line of the unit coil (9) as the axis of symmetry and sloping toward the unit coil (9), and a plate-type water outlet (30) being provided between the plate-type water collection trough (19) and the unit coil (9).

5. The water film reconstruction tubular evaporative cooler according to claim 1, characterized in that: The trough structure water film reconstruction system is composed of a left water distribution trough (150) and a right water distribution trough (160) arranged in parallel, the front end and the rear end of the left water distribution trough (150) and the right water distribution trough (160) are respectively connected to the front guide rail (27) and the rear guide rail (17), and a trough water collection trough (20) with the center line of the unit coil (9) as the symmetry axis and inclined toward the unit coil (9) is arranged on the left water distribution trough (150) and the right water distribution trough (160), and a trough water outlet (29) is arranged between the trough water collection trough (20) and the unit coil (9).

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