Tubular dew point indirect evaporative cooler
By designing a tube structure and spraying mechanism in an indirect evaporation cooler, forming a water film for heat exchange, the problems of high outlet temperature and maintenance difficulties in the prior art are solved, lower temperature output and simple maintenance are achieved, and the Moss is produced, improving cooling efficiency.
Patent Information
- Application Number
- CN202010756551.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-31
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2040-07-31
Smart Images
Figure CN111829118B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an indirect evaporative cooler, in particular to a tubular dew-point indirect evaporative cooler. Background Art
[0002] Indirect evaporative coolers are widely used in the fields of air conditioning, industrial cooling, and large data communication rooms. They make full use of natural cold sources and have unique effects in achieving energy conservation and emission reduction, and the harmonious development of green ecology and nature.
[0003] At present, wet-bulb indirect evaporative coolers are widely used in engineering. That is, the secondary air of the indirect evaporative cooler uses ambient air to enter the wet channel of the indirect evaporative cooler. In the wet channel, the secondary air and the water film on the heat exchange wall exchange heat and mass, reducing the surface temperature of the heat exchange wall. The primary air in the dry channel undergoes convective heat exchange with the heat exchange wall with a lower surface temperature, and the primary air is isohumidified. Although this wet-bulb indirect evaporative cooler has the effect of isohumidification cooling for engineering applications, the air temperature discharged from the outlet of this indirect evaporative cooler is relatively high, and it cannot be used in some occasions where the outlet temperature of the indirect evaporative cooler is required to be relatively low. In the prior art, there are also M-cycle dew-point indirect evaporative coolers or micro-perforated dew-point indirect evaporative coolers. However, the M-cycle dew-point indirect evaporative cooler needs to implant a very small micro-mist nozzle in the wet channel, which is easy to clog and difficult to maintain and repair. The micro-perforated dew-point indirect evaporative cooler has a very small gap between the primary and secondary channels, and it is easy to produce aquatic substances such as moss during operation. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a tubular dew-point indirect evaporative cooler, which can be used in situations where the outlet temperature is relatively low, is easy to maintain and overhaul, and is not prone to the generation of aquatic substances such as moss.
[0005] In order to solve the above problems, the following technical solutions are provided:
[0006] The tubular dew-point indirect evaporative cooler of the present invention comprises a box body, and a set of parallel side walls of the box body are respectively provided with an air inlet and an air outlet, and a primary fan is provided on the air outlet. It is characterized in that a bracket is provided in the box body between the air inlet and the air outlet, and the bracket is evenly provided with a primary heat exchange tube and a secondary heat exchange tube arranged horizontally, one end of the primary heat exchange tube faces the air inlet, and the other end faces the air outlet, one end of the secondary heat exchange tube faces the air inlet, and the other end is closed, and air outlets are evenly provided at the bottom of the secondary heat exchange tube. A spray mechanism is provided in the box body above the bracket, and a water tray is provided at the bottom of the box body below the bracket, and the water tray is connected to the spray mechanism through a pipeline and a circulating water pump. A secondary air outlet is provided at the top of the box body above the bracket, and a secondary fan is provided at the secondary air outlet.
[0007] Among them, the cross-section of the secondary heat exchange tube is a pentagon, and there is an arc transition between the two upper side walls of the secondary heat exchange tube, between the two upper side walls and the two adjacent lower side walls. There are downwardly protruding water stop flanges at the bottom of the secondary heat exchange tube and between the two adjacent side walls, and the water stop flanges run through the longitudinal direction of the secondary heat exchange tube.
[0008] The primary heat exchange tube is divided into at least two primary heat exchange tube layers arranged in parallel from top to bottom, and there are at least two primary heat exchange tubes in the primary heat exchange tube layer, and the heights of the primary heat exchange tubes in the primary heat exchange tube layer are all equal, and they are arranged side by side front to back. The secondary heat exchange tube is divided into at least two secondary heat exchange tube layers from top to bottom, and there are at least two secondary heat exchange tubes in the secondary heat exchange tube layer, and the heights of the secondary heat exchange tubes in the secondary heat exchange tube layer are all equal, and they are arranged side by side front to back. The primary heat exchange tube layer and the secondary heat exchange tube layer are arranged in an upper and lower staggered manner, and the secondary heat exchange tubes are all located between two adjacent primary heat exchange tubes in the primary heat exchange tube layer.
[0009] The spray mechanism comprises a horizontally arranged spray pipe, the bottom of which is evenly distributed with spray heads, and the water tray is connected to the spray pipe through a pipeline and a circulating water pump.
[0010] An air filter is arranged on the air inlet.
[0011] The cross section of the primary heat exchange tube is rhombus-shaped, and the transition between two adjacent side walls of the primary heat exchange tube is circular arc.
[0012] The cross section of the primary heat exchange tube is elliptical.
[0013] The above solution has the following advantages:
[0014] Since a bracket is arranged in a box between the air inlet and the air outlet of the tubular dew-point indirect evaporative cooler of the present invention, primary heat exchange tubes and secondary heat exchange tubes are evenly distributed on the bracket, one end of the primary heat exchange tube faces the air inlet and the other end faces the air outlet, one end of the secondary heat exchange tube faces the air inlet and the other end is closed, air outlets are evenly distributed on the bottom of the secondary heat exchange tube, a spray mechanism is arranged in the box above the bracket, a water pan is arranged at the bottom of the box below the bracket, the water pan is connected to the spray mechanism through a pipeline and a circulating water pump, a secondary air outlet is arranged at the top of the box above the bracket, and a secondary fan is arranged at the secondary air outlet. When in use, start the circulating water pump to pump the water in the water pan into the spray mechanism, and the spray mechanism evenly sprays the water onto the primary heat exchange tube and the secondary heat exchange tube to form a water film. Under the action of the primary fan and the secondary fan, the hot and dry air from the outdoor environment enters the box from the air inlet, and the air enters the primary heat exchange tube and the secondary heat exchange tube at the same time. After the primary air in the primary heat exchange tube is isohumidified and cooled to a certain state, it is discharged from the exhaust port to the required occasion. After the secondary air in the secondary tube is isohumidified and cooled to a certain degree, it enters the wet channel formed by the water film, the primary heat exchange tube and the secondary heat exchange tube from the small hole at the bottom. In the wet channel, the secondary air and the water film on the outer surface of the primary heat exchange tube and the secondary heat exchange tube exchange heat and mass, reducing the heat exchange surface temperature of the primary heat exchange tube and the secondary heat exchange tube. The wet steam generated during the secondary air and heat and mass exchange process is discharged to the outside by the secondary fan. When this evaporative cooler is in use, heat and mass exchange occurs between the secondary air and the water film on the outer surface of the primary heat exchange tube and the secondary heat exchange tube, which reduces the heat exchange surface temperature of the primary heat exchange tube and the secondary heat exchange tube, and increases the temperature difference between the primary heat exchange tube and the primary air, and between the secondary heat exchange tube and the secondary air, thereby improving the heat exchange efficiency of the primary heat exchange tube and the secondary heat exchange tube, and ensuring that the temperature of the primary air discharged from the exhaust port is low. Therefore, this cooler can be used in places where the outlet temperature of the indirect evaporative cooler is required to be low. In addition, there is no need to add micro-mist nozzles, and ordinary nozzles are not easy to clog, and maintenance and repair are simple. At the same time, there is no need to set the distance between the primary heat exchange tube and the secondary heat exchange tube to be small, and no aquatic substances such as moss will be generated. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of a tubular dew-point indirect evaporative cooler of the present invention;
[0016] Figure 2 yes Figure 1 Schematic diagram of the left side;
[0017] Figure 3 It is a schematic cross-sectional view of a primary tube in a tubular dew-point indirect evaporative cooler of the present invention;
[0018] Figure 4 It is a schematic diagram of the secondary tube structure in the tubular dew point indirect evaporative cooler of the present invention;
[0019] Figure 5 yes Figure 4 AA sectional view of FIG.
[0020] Figure 6 It is a psychrometric diagram comparing the effects of the tubular dew-point indirect evaporative cooler of the present invention and a traditional indirect evaporative cooler. DETAILED DESCRIPTION
[0021] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0022] like Figures 1 to 5 As shown, the tubular dew-point indirect evaporative cooler of the present invention comprises a box body 1, and an air inlet 11 and an air outlet 6 are respectively provided on a set of parallel side walls of the box body 1, and a primary fan 7 is provided on the air outlet 6. The characteristic is that a bracket 10 is provided in the box body 1 between the air inlet 11 and the air outlet 6, and the bracket 10 is evenly provided with a primary heat exchange tube 13 and a secondary heat exchange tube 14 arranged horizontally, one end of the primary heat exchange tube 13 faces the air inlet 11, and the other end faces the air outlet 6, one end of the secondary heat exchange tube 14 faces the air inlet 11, and the other end is closed, and air outlets 15 are evenly provided at the bottom of the secondary heat exchange tube 14. A spray mechanism is provided in the box body 1 above the bracket 10, and a water tray 8 is provided at the bottom of the box body 1 below the bracket 10, and the water tray 8 is connected to the spray mechanism through a pipeline and a circulating water pump 9. A secondary air outlet 3 is provided at the top of the box body 1 above the bracket 10, and a secondary fan 2 is provided on the secondary air outlet 3.
[0023] The cross section of the secondary heat exchange tube 14 is pentagonal, and the transition between the two upper side walls of the secondary heat exchange tube 14, the two upper side walls and the two lower side walls adjacent thereto are all arc transitions, and the bottom of the secondary heat exchange tube 14 and the two adjacent side walls are provided with downwardly protruding water stop flanges 16, which all penetrate the longitudinal direction of the secondary heat exchange tube 14. The advantage of this design is to prevent water film from entering the secondary tube from the outlet.
[0024] The primary heat exchange tube 13 is divided into at least two layers of primary heat exchange tubes 13 arranged in parallel from top to bottom, and there are at least two primary heat exchange tubes 13 in the primary heat exchange tube 13 layer, and the heights of the primary heat exchange tubes 13 in the primary heat exchange tube 13 layer are all equal, and they are arranged side by side front to back. The secondary heat exchange tube 14 is divided into at least two layers of secondary heat exchange tubes 14 from top to bottom, and there are at least two secondary heat exchange tubes 14 in the secondary heat exchange tube 14 layer, and the heights of the secondary heat exchange tubes 14 in the secondary heat exchange tube 14 layer are all equal, and they are arranged side by side front to back. The primary heat exchange tube 13 layer and the secondary heat exchange tube 14 layer are arranged in an upper and lower staggered manner, and the secondary heat exchange tubes 14 are all located between two adjacent primary heat exchange tubes 13 in the primary heat exchange tube 13 layer.
[0025] The spray mechanism comprises a horizontally arranged spray pipe 4 , the bottom of which is evenly distributed with spray heads 5 , and the water tray 8 is connected to the spray pipe 4 through a pipeline and a circulating water pump 9 .
[0026] An air filter 12 is disposed on the air inlet 11 .
[0027] The cross section of the primary heat exchange tube 13 is rhombus or elliptical. In this embodiment, the cross section of the primary heat exchange tube 13 is rhombus. When the cross section of the primary heat exchange tube 13 is rhombus, the transition between two adjacent side walls of the primary heat exchange tube 13 is circular arc. The special shape of the primary heat exchange tube 13 can ensure that the spray water evenly forms a water film covering the outer wall of the primary tube without dry spots.
[0028] When in use, start the circulating water pump 9, pump the water in the water tray 8 into the spray mechanism, and the spray mechanism sprays the water evenly onto the primary heat exchange tube 13 and the secondary heat exchange tube 14 to form a water film. Under the action of the primary fan 7 and the secondary fan 2, the hot and dry air from the outdoor environment enters the box body 1 from the air inlet 11, and the air enters the primary heat exchange tube 13 and the secondary heat exchange tube 14 at the same time. After the primary air in the primary heat exchange tube 13 is cooled to a certain state, it is discharged from the exhaust port 6 to the required place. After the secondary air in the secondary tube is cooled to a certain degree, it is discharged from the exhaust port 6 to the required place. Figure 6 The state point W in the air is cooled to the state point M, and enters the wet channel formed by the water film, the primary heat exchange tube 13 and the secondary heat exchange tube 14 from the small hole at the bottom. In the wet channel, the secondary air and the water film on the outer surface of the primary heat exchange tube 13 and the secondary heat exchange tube 14 exchange heat and mass, and the heat exchange surface temperature of the primary heat exchange tube 13 and the secondary heat exchange tube 14 is reduced. The wet steam generated during the heat and mass exchange between the secondary air and the secondary heat exchange tube is discharged to the outside by the secondary fan 2.
[0029] like Figure 6 As shown, the outlet air dry bulb temperature T of the traditional indirect evaporative cooler m =t w -Ƞt w -t ws The outlet air dry bulb temperature T of the tubular dew point indirect evaporative cooler of the present invention is o =t w -Ƞt w -t ms , T ms <T ws , with other parameters unchanged, T o <T m That is, the outlet air dry bulb temperature of the tube dew point indirect evaporative cooler is lower than the air dry bulb temperature of the traditional indirect evaporative cooler. Where W is the outdoor air state point, M is the outlet air state point of the traditional indirect evaporative cooler, O is the outlet air state point of the tube dew point indirect evaporative cooler, T Wis the dry bulb temperature of the outdoor air state point, T M is the outlet air dry bulb temperature of the conventional indirect evaporative cooler, T O is the outlet dry bulb temperature of the tubular dew point indirect evaporative cooler, T WS is the wet bulb temperature of the outdoor air state point, T MS It is the outlet wet-bulb temperature of the traditional indirect evaporative cooler and also the secondary air inlet wet-bulb temperature of the tubular dew-point indirect evaporative cooler.
Claims
1. A tubular dew-point indirect evaporative cooler, comprising a housing (1), wherein a set of parallel side walls of the housing (1) are provided with an air inlet (11) and an air outlet (6), and the air outlet (6) is provided with a primary fan (7); wherein the A bracket (10) is provided in the box body (1) between the air inlet (11) and the air outlet (6), and primary heat exchange tubes (13) and secondary heat exchange tubes (14) are evenly distributed on the bracket (10) in a horizontal arrangement. One end of the primary heat exchange tube (13) faces the air inlet (11) and the other end faces the air outlet (6), and one end of the secondary heat exchange tube (14) faces the air inlet (11) and the other end is closed. The bottom of the secondary heat exchange tube (14) is evenly distributed with air outlet holes (15); a spray nozzle (13) is provided in the box body (1) above the bracket (10). The box (1) below the bracket (10) has a water tray (8) at the bottom, and the water tray (8) is connected to the spray mechanism through a pipeline and a circulating water pump (9); the box (1) above the bracket (10) has a secondary air outlet (3) at the top, and a secondary fan (2) is provided on the secondary air outlet (3); the cross section of the secondary heat exchange tube (14) is pentagonal, and the two upper side walls of the secondary heat exchange tube (14) and the two upper side walls and the two lower side walls adjacent to them are all in an arc transition, and the secondary heat exchange tube (14) A downwardly protruding water stop flange (16) is provided between the bottom and two adjacent side walls thereof, and the water stop flange (16) penetrates the longitudinal direction of the secondary heat exchange tube (14); the primary heat exchange tube (13) is divided into at least two parallel and side-by-side arranged primary heat exchange tube (13) layers from top to bottom, and there are at least two primary heat exchange tubes (13) in the primary heat exchange tube (13) layer, and the heights of the primary heat exchange tubes (13) in the primary heat exchange tube (13) layer are all equal, and the primary heat exchange tubes (13) are arranged front to back and side by side; the secondary heat exchange tube (13) is The heat pipe (14) is divided into at least two secondary heat exchange pipe (14) layers from top to bottom, and there are at least two secondary heat exchange pipes (14) in each secondary heat exchange pipe (14) layer. In each secondary heat exchange pipe (14) layer, the secondary heat exchange pipes (14) are of equal height, and the secondary heat exchange pipes (14) are arranged side by side in a front-to-back manner; the primary heat exchange pipe (13) layer and the secondary heat exchange pipe (14) layer are arranged alternately up and down, and the secondary heat exchange pipes (14) are all located between two adjacent primary heat exchange pipes (13) in the primary heat exchange pipe (13) layer.
2. The tubular dew point indirect evaporative cooler according to claim 1, characterized in that The spray mechanism comprises a horizontally arranged spray pipe (4), spray heads (5) are evenly distributed at the bottom of the spray pipe (4), and the water tray (8) is connected to the spray pipe (4) via a pipeline and a circulating water pump (9).
3. The tubular dew-point indirect evaporative cooler according to claim 1 or 2, characterized in that An air filter (12) is disposed on the air inlet (11).
4. The tubular dew-point indirect evaporative cooler according to claim 3, characterized in that The cross section of the primary heat exchange tube (13) is rhombus-shaped, and two adjacent side walls of the primary heat exchange tube (13) are both in an arc transition.
5. The tubular dew-point indirect evaporative cooler according to claim 4, characterized in that The cross section of the primary heat exchange tube (13) is elliptical.