CN113883930A - Dividing wall type heat exchanger and application - Google Patents
Dividing wall type heat exchanger and application Download PDFInfo
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- CN113883930A CN113883930A CN202111159568.4A CN202111159568A CN113883930A CN 113883930 A CN113883930 A CN 113883930A CN 202111159568 A CN202111159568 A CN 202111159568A CN 113883930 A CN113883930 A CN 113883930A
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- heat exchanger
- dividing wall
- channel
- heat exchange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The application belongs to the technical field of cooling, and particularly relates to a dividing wall type heat exchanger and application. The existing plate heat exchanger has the disadvantages of uneven cooling, large temperature difference and poor cooling effect. The application provides a dividing wall type heat exchanger, which comprises a first heat exchange plate and a second heat exchange plate, wherein a plurality of first air channels and a plurality of second air channels are arranged between the first heat exchange plate and the second heat exchange plate, the first air channels and the second air channels are sequentially stacked, and the first air channels and the second air channels are arranged in a cross flow manner; the two ends of the first air channel are provided with filter screens, and the two ends of the second air channel are provided with filter screens. Compact structure, high heat transfer coefficient, small heat transfer temperature difference and good heat exchange effect.
Description
Technical Field
The application belongs to the technical field of cooling, and particularly relates to a dividing wall type heat exchanger and application.
Background
The heat exchanger is used as a device for transferring partial energy of hot fluid to cold fluid, and is widely applied to the fields of chemical industry, petroleum, energy power, mechanical equipment and the like. The heat exchanger can be a single device, such as a heater, a cooler, a condenser and the like; or the body shadow of a heat exchanger in a component of certain process equipment, such as a waste heat recovery system and an air separation system. The plate heat exchanger has the advantages of high heat transfer coefficient, strong temperature and pressure resistance, small occupied area, capability of realizing heat exchange of various media and the like, and becomes key equipment for effectively using energy and saving energy in modern industry.
Most of the existing plate heat exchangers are dividing wall type heat exchangers, and only heat exchange can be carried out but not material exchange can be carried out. For the scene of gas-gas heat exchange with larger thermal resistance, larger heat transfer temperature difference must be ensured.
The existing plate heat exchanger has the problems of uneven cooling, large temperature difference, poor cooling effect and the like.
Disclosure of Invention
1. Technical problem to be solved
Based on there is the inhomogeneous, the big, the still relatively poor problem of cooling effect of cooling in current plate heat exchanger, this application provides a dividing wall formula heat exchanger and application.
2. Technical scheme
In order to achieve the above purpose, the application provides a dividing wall type heat exchanger, which includes a first heat exchange plate and a second heat exchange plate, wherein a plurality of first air channels and a plurality of second air channels are arranged between the first heat exchange plate and the second heat exchange plate, the first air channels and the second air channels are sequentially stacked, and the first air channels and the second air channels are arranged in a cross flow manner; the two ends of the first air channel are provided with filter screens, and the two ends of the second air channel are provided with filter screens.
Another embodiment provided by the present application is: and micro-channels are arranged between the second air channels.
Another embodiment provided by the present application is: the micro-channel is a channel with a small hydraulic radius and an equal section or a channel with a small hydraulic radius and a non-equal section; the micro-channel is connected with a nozzle, and the nozzle is obliquely arranged.
Another embodiment provided by the present application is: a plurality of ribbed plates are arranged between the first heat exchange plate and the second heat exchange plate, and the nozzles are arranged on the ribbed plates.
Another embodiment provided by the present application is: the micro-channel is a cooling medium channel.
Another embodiment provided by the present application is: the dividing wall type heat exchanger is connected with a water pump.
Another embodiment provided by the present application is: the nozzle includes a nozzle orifice.
Another embodiment provided by the present application is: the first air channel is a primary air channel used for heat exchange, the second air channel is a secondary air channel used for heat and mass exchange.
Another embodiment provided by the present application is: the dividing wall type heat exchanger is made of plastic materials; the dividing wall type heat exchanger is prepared by adopting a 3D printing technology.
The application also provides an application of the dividing wall type heat exchanger, and the dividing wall type heat exchanger is applied to cooling of electronic devices.
3. Advantageous effects
Compared with the prior art, the application provides a dividing wall type heat exchanger and applied beneficial effect lies in:
the application provides a dividing wall type heat exchanger combines indirect evaporative cooling technique, provides a compact heat and mass exchanger, has the advantage that coefficient of heat transfer is high, the heat transfer difference in temperature is little, the heat transfer is effectual.
The application provides a dividing wall type heat exchanger, for a compact structure, heat transfer coefficient is high, the heat transfer difference in temperature is little, the indirect evaporative cooling heat exchanger of heat transfer effectual microchannel type.
The application provides a dividing wall type heat exchanger, temperature homogeneity is good, the cooling effect is good, the difference in temperature is little.
The application provides a dividing wall type heat exchanger, nozzle spun water evaporates in second air passage, has strengthened the heat transfer effect through heat and mass exchange, and the effectual shortcoming of traditional plate heat exchanger to wet cooling effect such as air unsatisfactory of having overcome.
The application provides a dividing wall type heat exchanger, the air current forms the water film with the partial drainage of atomizing not on the heat transfer board, strengthens the heat transfer through the water film evaporation. The secondary air disturbance is exhausted by the spray of the nozzle and the generated transverse jet flow, so that the heat exchange is further enhanced.
The application provides a dividing wall type heat exchanger, this heat exchanger can compare with current traditional heat exchanger with the fine waiting of primary air humidity cooling, have that heat transfer coefficient is high, the heat transfer difference in temperature is little, do not have welding interface, characteristics such as material to the fluid pollution-free.
The application provides a dividing wall type heat exchanger, because the processing technology who adopts is 3D prints, the effectual shortcoming that has overcome the unable microscale complex structure of realization of machining, each field of utilization in the life that can be extensive.
Drawings
FIG. 1 is a schematic diagram of the overall construction of the recuperative heat exchanger of the present application;
FIG. 2 is a schematic view of the construction of the flow channel of the dividing wall heat exchanger of the present application;
FIG. 3 is a schematic cross-sectional view of a portion of the recuperative heat exchanger of the present application;
fig. 4 is a second schematic view, partially in cross-section, of the recuperator of the present application.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
Referring to fig. 1 to 4, the application provides a dividing wall type heat exchanger, which includes a first heat exchange plate and a second heat exchange plate, wherein a plurality of first air channels 1 and a plurality of second air channels 2 are arranged between the first heat exchange plate and the second heat exchange plate, the first air channels 1 and the second air channels 2 are sequentially stacked, and the first air channels 1 and the second air channels 2 are arranged in a cross-flow manner to form a main channel of the heat exchanger; the two ends of the first air channel 1 are provided with filter screens, and the two ends of the second air channel 2 are provided with filter screens.
The filter screen can filter impurities in the fluid.
Indirect evaporative cooling is a unique equal-humidity cooling mode of evaporative cooling, and the basic principle is as follows: the air (called secondary air) and water after direct evaporative cooling are utilized to exchange heat with outdoor air through a heat exchanger, and fresh air (called primary air) cooling is realized. Because the primary air is not in direct contact with water, the moisture content of the primary air is kept unchanged, and the method is an equal-humidity cooling process. Compared with the conventional dividing wall plate type heat exchanger, the indirect evaporation cooling technology is adopted, the heat transfer with small temperature difference can be realized, 80-90% of energy can be saved in a hot and dry area, 20-25% of energy can be saved in a hot and humid area, and 40% of energy can be saved in a medium humidity area, so that the refrigeration energy consumption of an air conditioner is greatly reduced, and the heat transfer efficiency is improved.
Further, micro channels 3 are arranged between the second air channels 2. And a water-passing micro-channel 3 is arranged between the ribbed plates.
Further, the micro-channel 3 is a channel with a uniform cross section and a small hydraulic radius or a channel with a non-uniform cross section and a small hydraulic radius; the heat exchange plates are distributed among the plates according to the principle of heat and mass exchange balance and performance optimization of the two sides of the heat exchange plates. The microchannel 3 is connected with a nozzle, and the nozzle is obliquely arranged.
Furthermore, a plurality of ribbed plates are arranged between the first heat exchange plate and the second heat exchange plate, and the nozzles are arranged on the ribbed plates.
The heat exchange surfaces of the upper plate, the lower plate and the plates are staggered to form a primary air channel and a secondary air channel; a water-passing micro-channel is arranged between the ribbed plates, and nozzles are arranged on two side faces of the ribbed plates.
Further, the micro-channel is a cooling medium channel.
Further, the dividing wall type heat exchanger is connected with a water pump.
Further, the nozzle includes a nozzle hole.
Further, the first air passage is a primary air passage, the primary air passage is used for heat exchange, the second air passage is a secondary air passage, and the secondary air passage is used for heat and mass exchange.
Furthermore, the dividing wall type heat exchanger is made of plastic materials; the dividing wall type heat exchanger is prepared by adopting a 3D printing technology.
The plastic is adopted as a processing material, and the heat conduction resistance of the heat exchange plate is negligible relative to the heat convection resistance of the surface of the plate, so compared with metal, the plastic is adopted as the processing material, and the plastic has the characteristics of light weight, corrosion resistance, easiness in processing and low cost. Compared with the traditional heat exchanger, the heat exchanger is smaller in size, and meanwhile, the heat exchanger is internally provided with a plurality of microscale structures, so that the heat exchanger is processed by adopting a 3D printing technology, and the technical advantages of the technology can be better played.
The 3D printing technology can be adopted, and the characteristics of processing complex small-size structures can be better exerted. The 3D printing technology is an emerging technology which is emerging in recent years, based on the idea of layered manufacturing, a SolidWorks or CAD model is converted into a part by using meltable powder, integral printing or split printing can be selected, and the problem that a machining process cannot process a tiny complex structure can be solved. Meanwhile, the service life of the product is greatly prolonged because of no welding stress. The 3D printing technology is utilized to realize not only the traditional dividing wall type heat exchanger, but also the integrally formed micro-scale structure with a fine complex structure. Therefore, 3D printing technique, the indirect evaporative cooling plastic heat exchanger of microchannel type that can be fine realization this application to give full play to its structural feature.
The application of the dividing wall type heat exchanger is to cool electronic devices.
Examples
Fig. 1 is a schematic diagram of the overall composition structure of a microchannel indirect evaporative cooling plastic heat exchanger according to the present application. Fig. 2 is a schematic structural diagram of a flow channel of a heat exchanger according to the present application. Fig. 3 is a schematic partial cross-sectional view of a heat exchanger plate and rib construction according to the present application. FIG. 4 is a schematic partial cross-sectional view of the structure of the heat exchange plates, heat exchange microchannels, intercostal flow channels and nozzles of the present application. As shown in fig. 1 to 4, the microchannel indirect evaporative cooling plastic heat exchanger of the present application includes: primary air channels, i.e. first air channels 1, secondary air channels, i.e. second air channels 2, micro channels 3 for indirect evaporation of cooling medium, water, and nozzles for spraying water, micro channels for forming water, ribs of the support plates and upper and lower plates forming heat exchange channels. The primary air channel 1 and the secondary air channel 2 are plate-to-plate channels. Each layer of the heat exchanger has a plurality of channels separated by ribs. The micro-channels 3 through which water flows in the ribs are non-uniform cross-section channels with small radius and are distributed among the plates according to the principle of heat and mass balance of two sides of the heat exchange plate. The nozzle atomizes and sprays water in the micro-channel.
And water in the micro-channel 3 is pressurized by a water pump outside the heat exchanger, fills the whole channel and is sprayed into the secondary air channel 2 through a nozzle. As the secondary air passes through the secondary air channel 2, the water ejected by the nozzle is partially evaporated. Meanwhile, as the flow direction of the fluid sprayed out of the nozzle is vertical to the secondary air, the transverse disturbance of the secondary air can be enhanced, and the heat exchange is strengthened. The water which is not evaporated can form a liquid film on the heat exchange plate, and the heat exchange is continuously enhanced during the subsequent evaporation, thereby realizing the deep cooling of the primary air. Because the primary air is not in direct contact with water, the moisture content of the primary air is kept unchanged, and the state change process of the primary air is an equal-humidity cooling process. By utilizing the principle and the application, the temperature of the primary air can be greatly reduced on the premise of keeping the primary air humidity unchanged.
In the application, the micro-channels for water passing in the ribs are equal-section or non-equal-section channels with small hydraulic radius and are distributed among the plates according to the principle of heat and mass exchange balance and performance optimization on two sides of the heat exchange plate. The cross-sectional area and the arrangement scheme of the channel can be comprehensively considered according to the flow velocity of water in the channel, the spraying effect and the multiple factors of supplementing evaporated water, so that the principle of indirect evaporative cooling is better utilized.
In this application, the nozzle structure should be favorable to water to form the spraying, strengthens the lateral disturbance to the secondary air, and the 3D that still should be convenient for simultaneously prints and avoids the jam of the in-process normal water that flows.
In this application, the nozzle openings which open on the side of the projecting ribs also play a further important role: for a primary air channel without water spraying, the opening can destroy a boundary layer and increase the degree of fluid turbulence, so that the heat transfer process is enhanced; the apertures allow for even distribution of fluid across the ribs by equalizing pressure.
In this application, the ribs also play an important role: on one hand, the rib plate plays a supporting role for the primary air channel 1 and the secondary air channel 2; on the other hand, the carrier of the microchannel formed between the ribs serves as a carrier for the flow of water.
The 3D printing technology can effectively avoid the defect that the machining cannot process the fine and complex parts, and the integral processing or the split processing of the heat exchanger can be freely selected according to the requirement.
Because the thickness of the heat exchange surface (plate) of the heat exchanger is very thin, the heat conduction of the plate is relatively to the heat exchange of gas and wall surface, namely the heat conduction thermal resistance of the heat exchange thin plate is negligible relatively to the convection heat exchange thermal resistance of the surface of the plate, so that plastics can be adopted as a processing material, and the heat exchanger has the characteristics of light weight, corrosion resistance, easiness in processing, no pollution to fluid and low cost.
In a word, the micro-channel type indirect evaporative cooling plastic heat exchanger is processed by a 3D printing technology and has the characteristics of convenience in use, high heat transfer coefficient, small heat transfer temperature difference, no pollution to cooled air, energy conservation, environmental friendliness and the like. This application adopts plastics as processing material, because the heat conduction thermal resistance of heat transfer board can be neglected for the convection current heat transfer thermal resistance on the plate surface, consequently in comparison with metal, takes plastics as processing material, has light in weight, corrosion-resistant, workable, characteristics with low costs. Compared with the traditional heat exchanger, the heat exchanger is smaller in size, and meanwhile, the heat exchanger is internally provided with a plurality of microscale structures, so that the heat exchanger is processed by adopting a 3D printing technology, and the technical advantages of the technology can be better played.
The application has the advantages that: the heat exchanger is designed based on an indirect evaporative cooling technology, water sprayed out of a nozzle is evaporated in a secondary air channel, the heat exchange effect is enhanced through heat and mass exchange, and the defect that the traditional plate heat exchanger is not ideal in air humidity cooling effect is effectively overcome. Meanwhile, the air flow guides part of water which is not atomized to the heat exchange plate to form a water film, and the water film is evaporated to enhance heat exchange. The secondary air disturbance is exhausted by the spray of the nozzle and the generated transverse jet flow, so that the heat exchange is further enhanced. The heat exchanger can well cool primary air in an equal humidity mode, and compared with the existing traditional heat exchanger, the heat exchanger has the advantages of being high in heat transfer coefficient, small in heat transfer temperature difference, free of welding interface, free of pollution to fluid caused by materials and the like. Meanwhile, the adopted processing technology is 3D printing, so that the defect that the micro-scale complex structure cannot be realized by machining is effectively overcome, and the micro-scale complex structure can be widely used in various fields in life.
Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (10)
1. A dividing wall type heat exchanger is characterized in that: the heat exchanger comprises a first heat exchange plate and a second heat exchange plate, wherein a plurality of first air channels and a plurality of second air channels are arranged between the first heat exchange plate and the second heat exchange plate, the first air channels and the second air channels are sequentially stacked, and the first air channels and the second air channels are arranged in a cross-flow manner; the two ends of the first air channel are provided with filter screens, and the two ends of the second air channel are provided with filter screens.
2. A dividing wall heat exchanger as defined in claim 1, wherein: and micro-channels are arranged between the second air channels.
3. A dividing wall heat exchanger as defined in claim 2, wherein: the micro-channel is a channel with a small hydraulic radius and an equal section or a channel with a small hydraulic radius and a non-equal section; the micro-channel is connected with a nozzle, and the nozzle is obliquely arranged.
4. A dividing wall heat exchanger as defined in claim 3, wherein: a plurality of ribbed plates are arranged between the first heat exchange plate and the second heat exchange plate, and the nozzles are arranged on the ribbed plates.
5. A dividing wall heat exchanger as defined in claim 3, wherein: the micro-channel is a cooling medium channel.
6. A dividing wall heat exchanger as defined in claim 3, wherein: the dividing wall type heat exchanger is connected with a water pump.
7. The dividing wall heat exchanger of claim 4, wherein: the nozzle includes a nozzle orifice.
8. A dividing wall heat exchanger as defined in any one of claims 1 to 7, wherein: the first air channel is a primary air channel used for heat exchange, the second air channel is a secondary air channel used for heat and mass exchange.
9. The dividing wall heat exchanger of claim 5, wherein: the dividing wall type heat exchanger is made of plastic materials; the dividing wall type heat exchanger is prepared by adopting a 3D printing technology.
10. The application of a dividing wall type heat exchanger is characterized in that: use of a divided wall heat exchanger according to any of claims 1 to 9 for cooling of electronic devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111159568.4A CN113883930B (en) | 2021-09-30 | 2021-09-30 | Dividing wall type heat exchanger and application |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111159568.4A CN113883930B (en) | 2021-09-30 | 2021-09-30 | Dividing wall type heat exchanger and application |
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| Publication Number | Publication Date |
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| CN113883930A true CN113883930A (en) | 2022-01-04 |
| CN113883930B CN113883930B (en) | 2022-10-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117628949A (en) * | 2024-01-25 | 2024-03-01 | 中国核动力研究设计院 | Microchannel cooling tower and welding frock thereof |
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| CN117628949B (en) * | 2024-01-25 | 2024-04-09 | 中国核动力研究设计院 | Microchannel cooling tower and welding frock thereof |
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| Publication number | Publication date |
|---|---|
| CN113883930B (en) | 2022-10-28 |
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