Vertical shell tube dew point evaporative cooler

Abstract

The invention discloses a vertical shell and tube dew-point evaporative cooler, and aims to solve the problems of small channel gap, complexity in manufacturing, difficulty in mass production, inconvenience in maintenance and the like due to the adoption of flat plate or corrugated plate design in traditional dew-point evaporative coolers. The device comprises an air inlet section device, an evaporative cooling heat exchange device, a primary air outlet, an air return section device, a secondary air outlet and a circulating spraying section device which are sequentially connected through air pipes. A centrifugal air feeder is arranged at an inlet of the air inlet section device, a plurality of evaporative cooling heat exchange suction pipes are arranged on the inner side of the evaporative cooling heat exchange device, an evaporative cooling channel shell is installed on the outer side of the evaporative cooling heat exchange device, and the primary air outlet is formed in the top of the evaporative cooling heat exchange device. The air return section device is arranged on the outer side of the evaporative cooling heat exchange device, and the circulating spraying section device is arranged at the bottom of the evaporative cooling heat exchange device. The circulating spraying section device comprises a circulating water tank arranged on the bottom side of the evaporative cooling heat exchange device, a circulating water pump arranged on a circulating pipeline and a porous spraying opening formed in the top side of the evaporative cooling heat exchange device. Compared with the prior art, the cooler has the advantages that materials are saved, the cooler is light, a vertical shell tube countercurrent flow heat exchange structure convenient to disassemble is adopted, the heat exchange efficiency of the cooler is improved, the dew point efficiency is further improved, the cooling performance is better than that of a flat plate type structure, and the cooler has the advantages of being compact in structure, simple in manufacturing process, convenient and fast to maintain and the like and shows remarkable application potential in various application scenes. Meanwhile, a reference value is provided for large-scale production.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, specifically to a vertical shell-and-tube dew point evaporative cooler. Background Technology

[0002] Driven by the "dual carbon" goals and the upgrading of building energy efficiency requirements, traditional mechanical compression air conditioning, due to its high energy consumption and refrigerant pollution, is no longer suitable for the needs of low-carbon development. Evaporative cooling technology, with its advantages of using water as a refrigerant, zero CFC emissions, and low operating energy consumption, has become an important development direction in the HVAC field. Evaporative cooling technology uses the latent heat of vaporization of water as its core driving force. Compared with mechanical vapor compression cycle air conditioning, it saves 80% energy, reduces carbon dioxide emissions by 44%, and has a coefficient of performance (COP) of 10-20. It is one of the most energy-efficient technologies in existing heating, ventilation, air conditioning, and refrigeration systems and is considered a core replacement for mechanical vapor compression cycle air conditioning. Evaporative cooling technology is mainly divided into four categories: direct evaporative coolers, indirect evaporative coolers, semi-indirect evaporative coolers, and dew point evaporative coolers. Among them, dew point evaporative coolers, due to the innovative airflow structure proposed by Valery Messosenko in 2003, can reduce the outlet air temperature to below the wet-bulb temperature and close to the inlet air dew point temperature, resulting in significantly better thermal performance than the other three types of evaporative coolers. However, traditional dew point evaporative coolers mostly use flat or corrugated plate designs, which have problems such as small channel gaps, complex manufacturing, difficulty in mass production, and inconvenient maintenance. Evaporative cooling equipment is mainly divided into two categories: air conditioners and chillers. Evaporative cooling air conditioners can improve indoor air quality, but the all-air system duct occupies a large space and has high energy consumption for long-distance transportation. Traditional evaporative cooling chillers have structural limitations. For example, the chilled water temperature of direct evaporative cooling chillers is limited by wet-bulb temperature and is only suitable for dry and hot areas. Indirect evaporative cooling chillers require multiple stages in series to improve efficiency, and have high initial investment and large footprint. Composite evaporative cooling chillers often rely on packed towers for water distribution, which are prone to scaling and clogging of the packing due to poor water quality and high dust concentration, significantly increasing maintenance costs.

[0003] To overcome these bottlenecks, scholars have begun exploring structural innovation and performance enhancement pathways. On one hand, the M-cycle dew point evaporative cooling technology proposed by Valery Mysosenko has become a research hotspot. This technology achieves energy cascade utilization through secondary air precooling, allowing the cold water temperature to break through the wet-bulb temperature and approach the dew point temperature, significantly expanding the applicable climate zone of evaporative cooling technology. On the other hand, addressing the problems of large footprint of traditional horizontal shell-and-tube equipment and uneven water distribution of vertical equipment, vertical shell-and-tube and horizontal tube structures have gradually become research focuses. However, vertical shell-and-tube structures, with their advantages of small footprint, compact structure, and high dew point efficiency, are suitable for compact space requirements. At the same time, shell-and-tube structures abandon the complex splicing methods of traditional flat or corrugated plate structures. During maintenance, damaged tube bundles can be replaced individually without disassembling the whole structure, reducing maintenance difficulty and cost. Summary of the Invention

[0004] (1) Technical issues To address the problems of high energy consumption, low energy efficiency, and environmental pollution faced by traditional air conditioning systems, this invention provides a vertical shell-and-tube dew point evaporative cooler to replace the cooling requirements of traditional air conditioning. At the same time, it also addresses the problems of small channel gaps, complex manufacturing, difficulty in mass production, and inconvenient maintenance of traditional dew point evaporative coolers mentioned in the background art.

[0005] (2) Technical solution To solve the above problems, the present invention adopts the following technical solution: A vertical shell-and-tube dew point evaporative cooler includes an air inlet section, an evaporative cooling heat exchange device, a primary air outlet, a return air section, a secondary air outlet, and a circulating spray section, all connected sequentially via ductwork. A centrifugal fan is installed inside the air inlet section. The evaporative cooling heat exchange device includes 200-500 evaporative cooling heat exchange suction pipes and a square perforated plate. An evaporative cooling channel shell is installed outside the evaporative cooling heat exchange device. The surface of the evaporative cooling channel shell has a return air hole from the return air section and the secondary air outlet. The primary air outlet is located at the top of the evaporative cooling heat exchange device. The evaporative cooling heat exchange device and the air inlet section... The device is connected via an inlet square-to-round interface and a duct elbow. The evaporative cooling heat exchanger is connected to the primary air outlet via an outlet square-to-round interface. The evaporative cooling heat exchanger is equipped with a return air section device on its outer side. The return air section device includes a return air fan, a return air duct, and a return air round hole. The evaporative cooling heat exchanger is equipped with a circulating spray section device at its bottom. The circulating spray section device includes a circulating water tank located at the bottom of the evaporative cooling heat exchanger, a circulating water pump on the circulating pipeline, and a multi-hole spray nozzle located at the top of the evaporative cooling heat exchanger. The evaporative cooling heat exchanger, the circulating water tank, the circulating water pump, and the multi-hole spray nozzle are connected by a plastic hose.

[0006] In a preferred embodiment, the outer surface of the evaporative cooling heat exchange pipe is covered with a layer of cloth made of wood pulp and polyester fiber with strong water absorption, and the cloth thickness is 0.1~0.5mm.

[0007] In a preferred embodiment, the square perforated plate consists of three pieces, which are arranged from top to bottom as the first piece, the second piece, and the third piece. The thickness of the perforated plate is 3-8mm, the number of holes is 200-500, and the hole diameter is 3-10mm. The upper surfaces of the second and third pieces are covered with a layer of water-absorbing sponge with a thickness of 3-8mm.

[0008] In a preferred embodiment, the square perforated plate is used to fix and support the evaporative cooling heat exchange pipe.

[0009] In the preferred embodiment, the total pressure of the centrifugal blower at the inlet of the air inlet section is 1000~1500Pa, the air volume provided is 900~1500m³ / h, the total pressure range of the pipeline during normal operation of the blower is 200~500Pa, and the pressure difference between the two sides of the primary air inlet and outlet is 0~20Pa.

[0010] In a preferred embodiment, the cross-section of the evaporative cooling heat exchange pipe is circular, and the spacing between the evaporative cooling heat exchange pipes is consistent, with a spacing of 2~5mm.

[0011] To ensure the airtightness of the device, a rubber ring is filled between the square perforated plate and the evaporative cooling heat exchange pipe. The pore size of the rubber ring is 3~8mm and the wire diameter is 0.5~2mm.

[0012] In order to supply water to the fabric on the surface of the evaporative cooling heat exchange tube and ensure that it is completely wet, the multi-hole spray nozzles on the top side of the evaporative cooling heat exchange device are evenly distributed, with a spray nozzle spacing of 2~5mm, and the sponge covering the upper surface of the second and third square multi-hole plates has the function of storing water and distributing water evenly.

[0013] To completely isolate the secondary air from the primary air and ensure that the primary air does not increase its moisture content, the bottom and top square perforated plates are completely sealed with removable potting compound.

[0014] The vertical shell-and-tube dew point evaporative cooler of the present invention has the following beneficial effects: 1. The core heat exchange channel of this invention is made of plastic straws, which have the advantages of low cost and light weight. The thickness of the straws is 0.1~0.5mm, so the heat exchange effect is good.

[0015] 2. This invention adopts a vertical shell and tube structure and uses counter-current heat exchange, which makes the overall structure compact and occupies a small area. At the same time, due to its high dew point efficiency, it can provide a lower temperature and sufficient cooling capacity to the room.

[0016] 3. Compared with flat-plate dew point evaporative coolers, vertical shell-and-tube dew point evaporative coolers have a more significant cooling effect and higher thermal efficiency; compared with indirect evaporative coolers, vertical shell-and-tube dew point evaporative coolers can overcome the limitations of wet-bulb temperature; and compared with mechanical vapor compression cycle air conditioners, vertical shell-and-tube dew point evaporative coolers are more energy-efficient and environmentally friendly.

[0017] 4. The shell-and-tube structure of this invention has a high degree of standardization, can be mass-produced, adapts to global installation needs, and the straw bundle can be replaced individually. The structure is simple and maintenance is convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system of the present invention.

[0019] Figure 2 This is an isometric schematic diagram of the present invention.

[0020] Figure 3 This is an exploded view of the present invention.

[0021] Figure 4 This is a schematic diagram of the airflow and water flow directions of the present invention.

[0022] The markings in the image are as follows: Air inlet section device (1), centrifugal blower (1-1), inlet square to round interface (1-2), evaporative cooling heat exchange device (2), evaporative cooling heat exchange suction pipe (2-1), square perforated plate (2-2), evaporative cooling channel shell (2-3), primary air outlet (3), outlet square to round interface (3-1), return air section device (4), return air fan (4-1), return air duct (4-2), return air round hole (4-3), secondary air outlet (5), circulating spray section device (6), circulating water pump (6-1), circulating water tank (6-2), plastic hose (6-3), perforated spray nozzle (6-4). Detailed Implementation

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the device includes an air inlet section (1), an evaporative cooling heat exchange device (2), a primary air outlet (3), a return air section (4), a secondary air outlet (5), and a circulating spray section (6) connected sequentially by air ducts. The air inlet section (1) is equipped with a centrifugal blower (1-1) inside. The evaporative cooling heat exchange device (2) includes 200-500 evaporative cooling heat exchange suction pipes (2-1) and a square perforated plate (2-2) inside. The evaporative cooling heat exchange device (2) is equipped with an evaporative cooling channel shell (2-3) on the outside. The surface of the evaporative cooling channel shell (2-3) is provided with a return air round hole (4-3) of the return air section device (4) and the secondary air outlet (5). The evaporative cooling heat exchange device (2) is provided with a primary air outlet (3) on the top. The evaporative cooling heat exchange device (2) and the air inlet section (1) are connected by an inlet square-to-round interface (1). -2) and the duct elbow connection, the evaporative cooling heat exchange device (2) and the primary air outlet (3) are connected through the outlet square to round interface (3-1), the evaporative cooling heat exchange device is provided with the return air section device (4) on the outside, the return air section device (4) includes a return air fan (4-1), a return air duct (4-2) and a return air round hole (4-3), the bottom of the evaporative cooling heat exchange device (2) is provided with the circulating spray section device (6), the circulating spray section device (6) includes a circulating water tank (6-2) placed on the bottom side of the evaporative cooling heat exchange device (2), a circulating water pump (6-1) on the circulating pipeline and a multi-hole spray nozzle (6-4) placed on the top side of the evaporative cooling heat exchange device (2), the evaporative cooling heat exchange device (2), the circulating water tank (6-2), the circulating water pump (6-1) and the multi-hole spray nozzle (6-4) are connected by a plastic hose (6-3).

[0025] The outer surface of the evaporative cooling heat exchange pipe (2-1) is covered with a layer of cloth made of wood pulp and polyester fiber with strong water absorption, and the cloth thickness is 0.1~0.5mm.

[0026] The square perforated plate (2-2) consists of three pieces, which are the first piece, the second piece and the third piece from top to bottom. The thickness of the perforated plate is 3~8mm, the number of holes is 200~500, the hole diameter is 3~10mm, and the upper surface of the second piece and the third piece is covered with a layer of water-absorbing sponge with a thickness of 3~8mm.

[0027] In order to supply water to the fabric on the surface of the evaporative cooling heat exchange tube and ensure that it is completely wet, the multi-hole spray nozzles (6-4) on the top side of the evaporative cooling heat exchange device (2) are evenly distributed with a spacing of 2~5mm.

[0028] The square perforated plate (2-2) is used to fix and support the evaporative cooling heat exchange pipe (2-1), and a rubber ring is filled between the square perforated plate (2-2) and the evaporative cooling heat exchange pipe (2-1). The pore size of the rubber ring is 3~8mm and the wire diameter is 0.5~2mm, so that the whole device has better sealing performance.

[0029] The cross-section of the evaporative cooling heat exchange pipe (2-1) is circular, and the spacing between the evaporative cooling heat exchange pipes (2-1) is consistent, with a spacing of 2~5mm. Example

[0030] When using this vertical shell-and-tube dew point evaporative cooler, the user should first start the circulating water pump (6-1). The circulating water pump (6-1) pumps water from the circulating water tank (6-2) through the porous spray nozzle (6-4) onto the sponge on the surface of the second square porous plate (2-2). After the sponge absorbs water, it distributes the water evenly throughout the square area. Through the capillary action of the fabric, the water flow evenly covers the surface of the evaporative cooling heat exchange wick (2-1), forming a water film. At this time, outdoor air enters the vertical evaporative cooling heat exchange wick (2-1) through the air inlet device (1). The internal channel of the evaporative cooling heat exchange wick (2-1) serves as the dry channel, i.e., the primary air channel. The channel between the outside of the heat exchange wick (2-1) and the outer shell (2-3) of the evaporative cooling channel serves as a wet channel, i.e. a secondary air channel. The airflow coming out of the evaporative cooling heat exchange wick (2-1) is divided into two parts by the return air fan (4-1). One part of the airflow is drawn back by the return air fan (4-1) and flows into the wet channel as secondary air. The other part of the airflow is sent into the room as primary air. At the same time, the return air fan (4-1) can freely adjust the air volume, i.e. indirectly adjust the ratio of primary air to secondary air. The secondary air entering the return air section device (4) exchanges heat with the primary air in the wet channel in a countercurrent manner, continuously cooling the primary air. Finally, the secondary air is discharged through the secondary air outlet (5).

[0031] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A vertical shell-and-tube dew point evaporative cooler, comprising an air inlet section device (1), an evaporative cooling heat exchange device (2), a primary air outlet (3), a return air section device (4), a secondary air outlet (5), and a circulating spray section device (6) connected sequentially by air ducts. The air inlet section device (1) is equipped with a centrifugal blower (1-1) inside. The evaporative cooling heat exchange device (2) includes 200-500 evaporative cooling heat exchange suction pipes (2-1) and a square perforated plate (2-2) inside. The evaporative cooling heat exchange device (2) is equipped with an evaporative cooling channel shell (2-3) on the outside. The surface of the evaporative cooling channel shell (2-3) is provided with a return air hole (4-3) of the return air section device (4) and the secondary air outlet (5). The evaporative cooling heat exchange device (2) is equipped with the primary air outlet (3) at its top. The evaporative cooling heat exchange device (2) and the air inlet section device (1) are connected by an air inlet section device (6). The evaporative cooling heat exchange device (2) is connected to the primary air outlet (3) via the outlet square-round interface (3-1). The evaporative cooling heat exchange device is provided with the return air section device (4) on the outside. The return air section device (4) includes a return air fan (4-1), a return air duct (4-2), and a return air round hole (4-3). The evaporative cooling heat exchange device (2) is provided with the circulating spray section device (6) at the bottom. The circulating spray section device (6) includes a circulating water tank (6-2) placed on the bottom side of the evaporative cooling heat exchange device (2), a circulating water pump (6-1) on the circulating pipeline, and a multi-hole spray nozzle (6-4) placed on the top side of the evaporative cooling heat exchange device (2). The evaporative cooling heat exchange device (2), the circulating water tank (6-2), the circulating water pump (6-1), and the multi-hole spray nozzle (6-4) are connected by a plastic hose (6-3).

2. A vertical shell-and-tube dew point evaporative cooler according to claim 1, characterized in that: The outer surface of the evaporative cooling heat exchange pipe (2-1) is covered with a layer of cloth made of wood pulp and polyester fiber with strong water absorption, and the cloth thickness is 0.1~0.5mm.

3. A vertical shell-and-tube dew point evaporative cooler according to claim 1, characterized in that: The square perforated plate (2-2) consists of three pieces, which are the first piece, the second piece and the third piece from top to bottom. The thickness of the perforated plate is 3~8mm, the number of holes is 200~500, the hole diameter is 3~10mm, and the upper surface of the second piece and the third piece is covered with a layer of water-absorbing sponge with a thickness of 3~8mm.

4. A vertical shell-and-tube dew point evaporative cooler according to claim 1, characterized in that: The square perforated plate (2-2) is used to fix and support the evaporative cooling heat exchange pipe (2-1), and a rubber ring is filled between the square perforated plate (2-2) and the evaporative cooling heat exchange pipe (2-1). The pore size of the rubber ring is 3~8mm and the wire diameter is 0.5~2mm.

5. A vertical shell-and-tube dew point evaporative cooler according to claim 1, characterized in that: The cross-section of the evaporative cooling heat exchange pipe (2-1) is circular, and the spacing between the evaporative cooling heat exchange pipes (2-1) is consistent, with a spacing of 2~5mm.

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