CN113883930B - Dividing wall type heat exchanger and application - Google Patents

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

A kind of partition wall heat exchanger and its application

technical field

The application belongs to the technical field of cooling, and in particular relates to a partition heat exchanger and its application.

Background technique

As a device that transfers part of the energy of the hot fluid to the cold fluid, the heat exchanger is widely used in the fields of chemical industry, petroleum, energy power and mechanical equipment. A heat exchanger can be a separate device, such as a heater, cooler and condenser, etc.; it can also be a component of a certain process equipment, such as heat exchangers in waste heat recovery systems and air separation systems figure. The plate heat exchanger has the advantages of high heat transfer coefficient, strong temperature and pressure resistance, small footprint, and the ability to realize heat exchange in various media. It has become the key equipment for efficient use of energy and energy conservation in modern industry.

Most of the existing plate heat exchangers are partition wall heat exchangers, which can only exchange heat but not substances. For the gas-to-gas heat exchange scenario with large thermal resistance, a large heat transfer temperature difference must be ensured.

The existing plate heat exchanger has problems such as uneven cooling, large temperature difference, and poor cooling effect.

Contents of the invention

1. Technical problems to be solved

Based on the problems of uneven cooling, large temperature difference and poor cooling effect in the existing plate heat exchanger, the application provides a partitioned wall heat exchanger and its application.

2. Technical solution

In order to achieve the above purpose, the present application provides a partitioned heat exchanger, including a first heat exchange plate and a second heat exchange plate, and a Several first air passages and several second air passages, the first air passages and the second air passages are sequentially stacked, the first air passages and the second air passages are arranged in cross-flow; the first air passages Filter nets are arranged at both ends of the passage, and filter nets are arranged at both ends of the second air passage.

Another embodiment provided by the present application is: micro-channels are arranged between the second air channels.

Another embodiment provided by the present application is: the microchannel is a channel with a small hydraulic radius of equal cross-section or a channel with a small hydraulic radius of non-uniform cross-section; the microchannel is connected to a nozzle, and the nozzle is arranged obliquely.

Another embodiment provided by the present application is: several ribs are arranged between the first heat exchange plate and the second heat exchange plate, and the nozzles are arranged on the ribs.

Another embodiment provided by the present application is: the microchannel is a cooling medium channel.

Another embodiment provided by the present application is: the dividing wall heat exchanger is connected to a water pump.

Another embodiment provided by the present application is: the nozzle includes a nozzle hole.

Another embodiment provided by the present application is: the first air channel is a primary air channel, the primary air channel is used for heat exchange, the second air channel is a secondary air channel, and the secondary air channel For heat and mass exchange.

Another embodiment provided by the present application is: the partition heat exchanger is made of plastic material; the partition heat exchanger is made of 3D printing technology.

The present application also provides an application of a partitioned wall heat exchanger, and the partitioned wall heat exchanger is applied to cooling electronic devices.

3. Beneficial effect

Compared with the prior art, the beneficial effects of the dividing wall heat exchanger and application provided by the application are:

The partition wall heat exchanger provided by this application combines the indirect evaporative cooling technology to propose a compact heat mass exchanger, which has the advantages of high heat transfer coefficient, small heat transfer temperature difference, and good heat transfer effect.

The partition wall heat exchanger provided by this application is a microchannel type indirect evaporative cooling heat exchanger with compact structure, high heat transfer coefficient, small heat transfer temperature difference, and good heat transfer effect.

The partition wall heat exchanger provided by the application has good temperature uniformity, good cooling effect and small temperature difference.

In the partition wall heat exchanger provided by this application, the water sprayed from the nozzle evaporates in the second air channel, and the heat exchange effect is enhanced through heat and mass exchange, which effectively overcomes the ineffectiveness of the traditional plate heat exchanger for air and other humidity cooling. ideal disadvantages.

In the partitioned-wall heat exchanger provided by this application, the air flow diverts part of the non-atomized water to form a water film on the heat exchange plate, and the heat exchange is enhanced through the evaporation of the water film. The nozzle spray and the resulting horizontal jet flow out the secondary air disturbance to further enhance the heat transfer.

The partition wall heat exchanger provided by this application can cool the primary air in a good isohumidity. Compared with the existing traditional heat exchanger, it has high heat transfer coefficient, small heat transfer temperature difference, and no welding interface. , The material has no pollution to the fluid and so on.

The partition wall heat exchanger provided by this application effectively overcomes the shortcoming that machining cannot realize micro-scale complex structures because the processing technology adopted is 3D printing, and can be widely used in various fields of life.

Description of drawings

Fig. 1 is the overall composition structure schematic diagram of the dividing wall heat exchanger of the present application;

Fig. 2 is the constituent structure schematic diagram of the dividing wall heat exchanger flow channel of the present application;

Fig. 3 is a partial cross-sectional schematic diagram of a partitioned wall heat exchanger of the present application;

Fig. 4 is a second schematic diagram of a partial section of the dividing wall heat exchanger of the present application.

Detailed ways

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. According to these detailed descriptions, those skilled in the art can clearly understand the present application and can implement the present application. Without departing from the principle of the present application, the features in different embodiments can be combined to obtain new implementations, or some features in certain embodiments can be replaced to obtain other preferred implementations.

Referring to Figures 1 to 4, the present application provides a partitioned heat exchanger, including a first heat exchange plate and a second heat exchange plate, and several heat exchange plates are arranged between the first heat exchange plate and the second heat exchange plate. A first air channel 1 and a plurality of second air channels 2, the first air channel 1 and the second air channel 2 are stacked in sequence, the first air channel 1 and the second air channel 2 are arranged in a cross flow, It constitutes the 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 here can filter the impurities in the fluid.

Indirect evaporative cooling is a unique isohumid cooling method of evaporative cooling. Its basic principle is: use the air (called secondary air) and water after direct evaporative cooling to exchange heat with the outdoor air through a heat exchanger to achieve fresh air. (called primary air) cooling. Since the primary air is not in direct contact with water, its moisture content remains unchanged, which is an isohumidity cooling process. Compared with the conventional partition wall heat exchanger, the indirect evaporative cooling technology can realize heat transfer with small temperature difference, which can save energy by 80% to 90% in hot and dry areas, and 20% to 25% in hot and humid areas. The region can save energy by 40%, thereby greatly reducing the energy consumption of air conditioning and cooling, and improving the heat transfer efficiency.

Further, micro-channels 3 are arranged between the second air channels 2 . Between the ribs is a water-through microchannel 3 .

Further, the microchannels 3 are equal-section channels with a small hydraulic radius or non-equal-section channels with a small hydraulic radius; they are distributed among the plates according to the principle of heat and mass exchange balance and performance optimization on both sides of the heat exchange plate. The microchannel 3 is connected with a nozzle, and the nozzle is arranged obliquely.

Further, several ribs are arranged between the first heat exchange plate and the second heat exchange plate, and the nozzles are arranged on the ribs.

The upper plate, the lower plate and the heat exchange surfaces between the plates are staggered to form a primary air channel and a secondary air channel; between the ribs is a micro channel for water, and the two sides of the ribs are provided with nozzles.

Further, the microchannel is a cooling medium channel.

Further, the partitioned wall heat exchanger is connected with a water pump.

Further, the nozzle includes a nozzle hole.

Further, the first air channel is a primary air channel, and the primary air channel is used for heat exchange, and the second air channel is a secondary air channel, and the secondary air channel is used for heat and mass exchange.

Further, the dividing wall heat exchanger is made of plastic material; the dividing wall heat exchanger is made of 3D printing technology.

Plastic is used as the processing material, since the heat conduction thermal resistance of the heat exchange plate is negligible compared with the convective heat transfer thermal resistance of the plate surface, so compared with metal, plastic is used as the processing material, which has the advantages of light weight, corrosion resistance, easy processing, The characteristics of low cost. Since the size of the heat exchanger is smaller than that of traditional heat exchangers, and there are many micro-scale structures inside the heat exchanger, it can be processed by 3D printing technology to better utilize the technical advantages of this technology.

3D printing technology can be used to better play the characteristics of processing complex and small-sized structures. 3D printing technology is an emerging technology that has emerged in recent years. It is based on the idea of layered manufacturing. It uses meltable powder to convert SolidWorks or CAD models into parts. You can choose integral printing or split printing, which can solve the problems that cannot be solved by mechanical processing. The problem of processing small and complex structures. At the same time, because there is no welding stress, the product life is greatly improved. The use of 3D printing technology can not only realize the traditional partition wall heat exchanger, but also realize the integrally formed micro-scale structure of the fine and complex structure. Therefore, 3D printing technology can well realize the microchannel type indirect evaporative cooling plastic heat exchanger of the present application, and give full play to its structural characteristics.

An application of a dividing wall heat exchanger, the said dividing wall heat exchanger is applied to the cooling of electronic devices.

Example

Fig. 1 is a schematic diagram of the overall composition and structure of a plastic heat exchanger for microchannel indirect evaporative cooling described in this application. Fig. 2 is a schematic diagram of the composition and structure of the flow channel of the heat exchanger described in the present application. Fig. 3 is a partial cross-sectional schematic diagram of the composition structure of the heat exchange plate and inter-plate ribs described in the present application. Fig. 4 is a partial cross-sectional schematic diagram of the composition structure of the heat exchange plate, the heat exchange microchannel, the intercostal flow channel and the nozzle described in the present application. As shown in Figures 1 to 4, a micro-channel type indirect evaporative cooling plastic heat exchanger described in this application includes: a primary air channel, namely the first air channel 1, and a secondary air channel, namely the second air channel 2, for indirect Evaporative cooling medium—microchannel 3 of water, nozzles for spraying water, ribs for forming water microchannels and supporting plates and upper and lower plates forming heat exchange channels. The primary air channel 1 and the secondary air channel 2 are the channels between the plates. Each layer of the heat exchanger has several channels separated by ribs. The micro-channels 3 passing water in the ribs are non-equal cross-section channels with a small radius, and are distributed between the plates according to the principle of heat and mass balance on both sides of the heat exchange plates. The nozzle atomizes and sprays the water in the microchannel.

The water in the microchannel 3 is pressurized by a water pump outside the heat exchanger, fills the entire channel, and is sprayed into the secondary air channel 2 through nozzles. When the secondary air passes through the secondary air passage 2, part of the water ejected from the nozzles is evaporated. At the same time, since the flow direction of the fluid ejected from the nozzle is perpendicular to the secondary air, the lateral disturbance of the secondary air can be enhanced and the heat exchange can be enhanced. The unevaporated water will form a liquid film on the heat exchange plate, which will continue to strengthen the heat exchange during the subsequent evaporation, thereby realizing the deep cooling of the primary air. Since the primary air is not in direct contact with water, its moisture content remains unchanged, and the state change process of the primary air is an isohumidity cooling process. By using the above principles and the present application, the temperature of the primary air can be greatly reduced while keeping the humidity of the primary air unchanged.

In this application, the water-passing micro-channels in the ribs are equal-section or non-equal-section channels with a small hydraulic radius, and are distributed between the plates according to the principle of heat and mass exchange balance and performance optimization on both sides of the heat exchange plate. The channel cross-sectional area and layout scheme can be comprehensively considered according to the flow rate of water in the channel, the spray effect and the replenishment of evaporated water, so as to make better use of the principle of indirect evaporative cooling.

In this application, the nozzle structure should be conducive to the formation of water spray, strengthen the lateral disturbance of the secondary air, and at the same time, it should be convenient for 3D printing and avoid water clogging during the flow process.

In this application, the nozzle holes on the side of the protruding ribs also play other important roles: for the primary air channel without water spray, the holes can destroy the boundary layer and increase the degree of fluid turbulence, thereby enhancing the heat transfer process; The fluid on both sides of the rib can be evenly distributed through pressure equalization.

In the present application, the ribs also play an important role: on the one hand, the ribs play 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 becomes Carrier of water flow.

The use of 3D printing technology can effectively avoid the disadvantage that machining cannot process fine and complex parts, and can freely choose integral processing or split processing of heat exchangers according to needs.

Since the heat exchange surface (plate) of the heat exchanger is very thin, the heat conduction of the plate is negligible relative to the heat exchange between the gas and the wall, that is, the heat conduction resistance of the heat exchange thin plate is negligible relative to the convective heat transfer resistance of the plate surface Therefore, plastics can be used as processing materials, which have the characteristics of light weight, corrosion resistance, easy processing, no pollution to fluids, and low cost.

In short, the microchannel type indirect evaporative cooling plastic heat exchanger described in this application is originally processed by 3D printing technology, which has the advantages of convenient use, high heat transfer coefficient, small heat transfer temperature difference, no pollution to the cooled air, energy saving and environmental protection Features. This application uses plastic as the processing material. Since the heat conduction thermal resistance of the heat exchange plate is negligible compared to the convective heat transfer thermal resistance of the plate surface, compared with metal, plastic is used as the processing material, which has the advantages of light weight, corrosion resistance, and ease of use. Processing, low cost characteristics. Since the size of the heat exchanger is smaller than that of traditional heat exchangers, and there are many micro-scale structures inside the heat exchanger, it can be processed by 3D printing technology to better utilize the technical advantages of this technology.

The advantages of this application include: the heat exchanger is designed based on indirect evaporative cooling technology, the water sprayed from the nozzle evaporates in the secondary air channel, and the heat exchange effect is enhanced through heat and mass exchange, which effectively overcomes the traditional plate cooling The disadvantage of the heat exchanger is that the cooling effect of the air and other humidity is not ideal. At the same time, the airflow diverts the non-atomized part of the water to form a water film on the heat exchange plate, and the heat exchange is enhanced through the evaporation of the water film. The nozzle spray and the resulting horizontal jet flow out the secondary air disturbance to further enhance the heat transfer. Compared with the existing traditional heat exchangers, the heat exchanger has the characteristics of high heat transfer coefficient, small heat transfer temperature difference, no welding interface, and no pollution to the fluid by materials. At the same time, since the processing technology adopted is 3D printing, it effectively overcomes the shortcomings that machining cannot realize micro-scale complex structures, and can be widely used in various fields of life.

Although the present application has been described above with reference to specific embodiments, those skilled in the art should understand that many modifications can be made to the configurations and details disclosed in the present application within the principles and scope disclosed in the present application. The protection scope of the present application is determined by the appended claims, and the claims are intended to cover all modifications included in the equivalent literal meaning or scope of the technical features in the claims.

Claims (7)

1. A dividing wall type heat exchanger is characterized in that: 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 dividing wall type 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; two ends of the first air channel are provided with filter screens, and two ends of the second air channel are provided with filter screens; micro-channels are arranged between the second air channels, the micro-channels are water channels, and the micro-channels are connected with the nozzles; 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.

2. The recuperator of claim 1, 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 nozzle is arranged obliquely.

3. A dividing wall heat exchanger as defined in claim 2, 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.

4. A dividing wall heat exchanger as defined in claim 2, wherein: the micro-channel is a cooling medium channel.

5. A dividing wall heat exchanger as defined in claim 2, wherein: the dividing wall type heat exchanger is connected with a water pump.

6. The recuperator of claim 3, wherein: the nozzle includes a nozzle orifice.

7. The application of the dividing wall type heat exchanger is characterized in that: use of a divided wall heat exchanger according to any of claims 1 to 6 for cooling of electronic devices.

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