Total heat exchange core and manufacturing method thereof, fresh air machine

Abstract

The application discloses a total heat exchange core and a manufacturing method thereof, and a fresh air machine. The total heat exchange core comprises a total heat exchange unit, the total heat exchange unit has a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are sealed one-way conducting fluid channels, the conducting directions of the first fluid channel and the second fluid channel are opposite, and the first fluid channel and the second fluid channel are spaced apart by a heat and moisture exchange film and exchange heat and moisture. The total heat exchange core has high fluid flow efficiency and high heat and moisture exchange efficiency.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of heat exchange, and particularly to a total heat exchange core and its manufacturing method, as well as a fresh air unit using the total heat exchange core. Background Technology

[0002] With the increasing airtightness of urban buildings, the widespread use of air conditioning, and the diversification of building decoration materials, the air quality in people's daily lives and workplaces is deteriorating. This leads to symptoms such as headaches, nausea, difficulty breathing, and eye and throat pain in people who spend long periods in enclosed spaces. Therefore, maintaining air circulation between the inside and outside of buildings is crucial for human health.

[0003] A fresh air system equipped with a total heat exchange core is a high-efficiency, energy-saving, and environmentally friendly high-tech product that filters, purifies, and heat-treats outdoor fresh air before sending it indoors, while simultaneously filtering, purifying, and heat-exchanging indoor air before expelling it outdoors. The indoor temperature is largely unaffected by the fresh air intake. The core component of this type of fresh air system is the total heat exchange core, through which stale indoor air and fresh outdoor air exchange heat, thus achieving both ventilation and temperature maintenance.

[0004] Improving the thermal conductivity and water vapor permeability of total heat exchange cores has always been a research topic. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0006] The main objective of this application is to provide a total heat exchange core, a fresh air fan using the total heat exchange core, and a method for manufacturing the total heat exchange core, wherein the total heat exchange core has high fluid flow efficiency and high heat and moisture exchange efficiency.

[0007] To achieve the above objectives, this application provides a total heat exchange core, comprising: a total heat exchange unit having a first fluid channel and a second fluid channel, both the first fluid channel and the second fluid channel being sealed unidirectional fluid channels, the conduction directions of the first fluid channel and the second fluid channel being opposite, the first fluid channel and the second fluid channel being separated by a heat and moisture exchange membrane and exchanging heat and moisture.

[0008] Preferably, the total heat exchange unit includes a partition plate, and a groove is provided on the first plate surface of the partition plate. The heat and moisture exchange membrane is provided in the groove to divide the groove into a first groove and a second groove.

[0009] The total heat exchange unit is provided at least one; when there are multiple total heat exchange units, multiple partitions are arranged side by side, a first groove of one partition and a second plate surface of an adjacent partition are engaged to form a first fluid channel, and a second groove of one partition and a second plate surface of an adjacent partition are engaged to form a second fluid channel.

[0010] Preferably, the total heat exchange core may further include a cover plate located on one side of the total heat exchange core, and the cover plate cooperates with a first groove of the adjacent partition plate to form the first fluid channel, and the cover plate cooperates with a second groove of the adjacent partition plate to form the second fluid channel.

[0011] Preferably, both the first fluid channel and the second fluid channel are Tesla valve structures; in adjacent first fluid channels and second fluid channels, the conduction directions of adjacent Tesla valve structures are opposite and their edges at least partially overlap, and the overlapping edges are at least partially formed by the heat and moisture exchange membrane.

[0012] Preferably, the groove is a network of grooves, the partition includes teardrop-shaped protrusions formed by the grooves, and the channel of the Tesla valve structure is formed between the heat and moisture exchange membrane and the protrusions.

[0013] Preferably, in adjacent first and second fluid channels, the edges of adjacent Tesla valve structures overlap to the maximum extent.

[0014] Preferably, the partition is made of plastic.

[0015] Preferably, the heat and moisture exchange membrane comprises fibers.

[0016] Preferably, the raw materials for preparing the fiber include fiber-forming materials, solvents, and additives, wherein the additives are selected from at least one of hydrophilic agents, surfactants, and antibacterial agents.

[0017] Preferably, the raw materials for preparing the fiber include: 100 parts by weight of fiber-forming material, 500 to 50,000 parts by volume of solvent, 0.5 to 5 parts by weight of hydrophilic agent, 50 to 500 parts by weight of surfactant, and 0.5 to 5 parts by weight of antibacterial agent, wherein 1 part by weight: 1 part by volume is 1 g: 1 mL.

[0018] Preferably, the average diameter of the fiber is 20 nm to 50 nm.

[0019] Preferably, the thickness of the heat and moisture exchange membrane is 30 μm to 100 μm, and the average pore diameter is 200 nm to 300 nm.

[0020] This application also provides a method for manufacturing the full heat exchange core as described above, including:

[0021] A partition is provided, wherein at least one groove is provided on the first surface of the partition;

[0022] The heat and moisture exchange membrane is shaped to match the groove.

[0023] The formed heat and moisture exchange membrane is fixed in the groove, and the heat and moisture exchange membrane divides the groove into a first groove and a second groove.

[0024] The total heat exchange core is obtained by sealing the groove of the partition with a cover plate, wherein the cover plate and the first groove of the partition plate cooperate to form the first fluid channel, and the cover plate and the second groove of the partition plate cooperate to form the second fluid channel; or, another partition plate is provided, and the groove is sealed with the second plate surface of the other partition plate, wherein the second plate surface of the other partition plate cooperates with the first groove to form the first fluid channel, and the second plate surface of the other partition plate cooperates with the second groove to form the second fluid channel. A partition plate and the first fluid channel and the second fluid channel formed between the partition plate and the adjacent partition plate constitute a total heat exchange unit. Multiple total heat exchange units are arranged side by side. The groove of the outermost partition plate is sealed with a cover plate, wherein the cover plate and the first groove of the outermost partition plate cooperate to form the first fluid channel, and the cover plate and the second groove of the outermost partition plate cooperate to form the second fluid channel, thereby obtaining the total heat exchange core.

[0025] Preferably, the heat and moisture exchange membrane is fixed in the groove by welding.

[0026] Preferably, the process of forming the heat and moisture exchange membrane is hot pressing.

[0027] Preferably, before forming the heat and moisture exchange membrane, the method further includes:

[0028] A cellulose solution is obtained by mixing the fiber-forming material, solvent, hydrophilic agent, surfactant, and antibacterial agent.

[0029] The cellulose solution was processed into a heat and moisture exchange membrane containing fibers using an electrospinning process.

[0030] This application also provides a fresh air system, including the total heat exchange core provided in the above-described embodiments.

[0031] The total heat exchange core of this application adopts a one-way fluid channel with a one-way airflow valve feature, which can not only improve fluid flow efficiency, but also improve heat and moisture exchange efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 Left view of a schematic diagram of the longitudinal cross-sectional structure of a full heat exchange core, which is an exemplary embodiment of this application;

[0034] Figure 2 Right view of a schematic diagram of the longitudinal cross-sectional structure of a full heat exchange core, which is an exemplary embodiment of this application;

[0035] Figure 3 A schematic diagram of the structure of the first partition of the total heat exchange core, which is an exemplary embodiment of this application;

[0036] Figure 4 A schematic diagram of the arrangement of the first groove of the total heat exchange core on the first partition plate, which is an exemplary embodiment of this application;

[0037] Figure 5 A schematic diagram of the structure of the first groove of the total heat exchange core, which is an exemplary embodiment of this application;

[0038] Figure 6 The flow direction of fresh air and exhaust air using cross ventilation in the total heat exchange core of this application embodiment;

[0039] Figure 7 A top view of the exhaust duct in a cross-ventilation system;

[0040] Figure 8 A top view of the fresh air duct in a cross-ventilation system;

[0041] Figure 9 The flow direction of fresh air and exhaust air using the same-side ventilation method in the total heat exchange core of this application embodiment;

[0042] Figure 10 A top view of the exhaust duct for a ventilation system on the same side;

[0043] Figure 11 A top view of the fresh air duct for the same-side ventilation system;

[0044] Figure 12 This is a process flow diagram of the manufacturing method of the total heat exchange core according to an embodiment of this application.

[0045] Explanation of icon numbers:

[0046] 10 First fluid channel 41 groove 20 Second fluid channel 411 First groove 30 Heat and moisture exchange membrane 412 Second groove 40 partition

[0047] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] To improve the eco-friendly properties of total heat exchange cores, using natural cellulose fibers as the substrate is an important technical solution. However, total heat exchange cores based on natural cellulose fibers also face problems such as the need to further improve thermal conductivity and water vapor permeability, susceptibility to mold growth during use, and the urgent need to optimize airflow channels.

[0050] For example, Chinese patent application CN201380038460.7, entitled "Multilayer Structure Containing Microfiber Cellulose Layers," discloses a multilayer structure prepared using cellulose fibers as raw materials. This multilayer structure is assembled using nonwoven fabric preparation technology and papermaking technology. It can serve as a heat and moisture exchange material in a total heat exchanger, achieving high water vapor permeability and thermal conductivity. However, the papermaking technology used to form the multilayer structure with multiple nonwoven fabric layers suffers from high losses and complex processes. Furthermore, coating or spraying solutions or dispersions of highly hydrophilic compounds onto the multilayer structure using traditional dispersion methods easily leads to uneven distribution and accumulation of the hydrophilic compounds, affecting the long-term effectiveness of the heat and moisture permeability of the multilayer structure.

[0051] For example, Chinese patent application CN201610312147.3, entitled "Total Heat Exchange Heat Recovery Membrane and its Manufacturing Process and Equipment," discloses a technical concept of attaching a water molecule adsorbent to the surface of a cellulose matrix to obtain a composite material with moisture permeability and heat conduction. The water molecule adsorbent includes Al2O3, lithium chloride, etc., and the cellulose matrix includes virgin pulp, cellulose diacetate, etc. The process of attaching the water molecule adsorbent to the cellulose matrix adopts a conventional spraying process. The resulting total heat exchange heat recovery membrane can effectively improve water vapor transmission, cold / heat exchange efficiency, and enthalpy efficiency without affecting the fresh air volume. However, using a spraying process to attach the water molecule adsorbent to the cellulose matrix has two drawbacks: firstly, the water molecule adsorbent is prone to accumulation on the surface of the cellulose matrix, thus affecting the long-term effectiveness of the heat and moisture permeability of the total heat exchange heat recovery membrane; secondly, there is a significant loss of the water molecule adsorbent.

[0052] For example, Chinese patent application CN201980045888.1, entitled "Total Heat Exchange Element and Manufacturing Method Thereof," discloses a total heat exchange element comprising multiple partitions, a spacing maintaining component, and an adhesive component. The spacing maintaining component is primarily made of cellulose fiber substrate and is bonded to the partitions via adhesives. This total heat exchange element exhibits good overall moisture permeability. However, there is a concern that volatile substances in the adhesive can easily evaporate into the room, posing a health risk to users. Furthermore, although this patent application also optimizes the structure of the airflow channel, it still does not exceed the structural limitations of a plate-fin total heat exchange core.

[0053] For example, Chinese patent application CN202111090543.3, entitled "Spacer Sheet and Total Heat Exchange Element," discloses a technical concept for preparing a composite material with moisture permeability and thermal conductivity using a hygroscopic agent, a surfactant, and cellulose fiber as raw materials. The hygroscopic agent includes at least one of calcium chloride and lithium chloride; the cellulose fiber includes fibers obtained from wood pulp; and the surfactant includes cationic surfactants, amphoteric surfactants, and nonionic surfactants. The spacer sheet is obtained by coating or impregnating a solution containing the hygroscopic agent and surfactant onto a sheet containing cellulose fiber as the main component. This spacer sheet exhibits good water absorption and suppresses condensation. However, the method of distributing the hygroscopic agent onto the sheet containing cellulose fiber as the main component through coating or impregnation can easily lead to the accumulation of the hygroscopic agent on the surface of the sheet, thus affecting the long-term effectiveness of the heat and moisture permeability of the spacer sheet. Furthermore, its airflow path structure limits airflow efficiency, thereby limiting further improvement in heat and moisture exchange efficiency.

[0054] This application provides a total heat exchange core.

[0055] Figure 1 Left view of a schematic diagram of the longitudinal cross-sectional structure of a full heat exchange core, which is an exemplary embodiment of this application; Figure 2 Right view of a schematic diagram of the longitudinal cross-sectional structure of a full heat exchange core, which is an exemplary embodiment of this application; Figure 3 A schematic diagram of the structure of the first partition of the total heat exchange core, which is an exemplary embodiment of this application; Figure 4 A schematic diagram of the arrangement of the first groove of the total heat exchange core on the first partition plate, which is an exemplary embodiment of this application; Figure 5 This is a schematic diagram of the structure of the first groove of the total heat exchange core, which is an exemplary embodiment of this application.

[0056] like Figures 1 to 5 As shown, the total heat exchange core of this application embodiment includes: a total heat exchange unit, the total heat exchange unit includes a first fluid channel 10 and a second fluid channel 20, both of which are sealed unidirectional fluid channels, the conduction direction of the first fluid channel 10 is opposite to that of the second fluid channel 20, the first fluid channel 10 and the second fluid channel 20 are separated by a heat and moisture exchange membrane 30 and exchange heat and moisture.

[0057] The total heat exchange core of this application adopts a one-way fluid channel with a one-way airflow valve feature, which can not only improve fluid flow efficiency, but also improve heat and moisture exchange efficiency.

[0058] In the embodiments of this application, the total heat exchange unit may include a partition plate 40, and a groove 41 may be provided on the first plate surface of the partition plate 40. A heat and moisture exchange membrane 30 is provided in the groove 41, so that the groove 41 can be divided into a first groove 411 and a second groove 412.

[0059] Multiple total heat exchange units can be provided, and multiple partitions 40 of the multiple total heat exchange units can be arranged in parallel. The first groove 411 of one partition 40 cooperates with the second plate surface of the adjacent partition 40 to form a first fluid channel 10, and the second groove 412 of one partition 40 cooperates with the second plate surface of the adjacent partition 40 to form a second fluid channel 20.

[0060] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the total heat exchange core may further include a cover plate 50, which is located on one side of the total heat exchange core. The cover plate 50 cooperates with the first groove 411 of the adjacent partition 40 to form a first fluid channel 10, and the cover plate 50 cooperates with the second groove 412 of the adjacent partition 40 to form a second fluid channel 20.

[0061] In the embodiments of this application, the number of total heat exchange units in the total heat exchange core can be any number from 2 to 200.

[0062] In an embodiment of this application, the total heat exchange core may include a partition and a cover plate. A first groove of the partition cooperates with the cover plate to form a first fluid channel, and a second groove of the partition cooperates with the cover plate to form a second fluid channel, thus forming a total heat exchange unit.

[0063] In the embodiments of this application, such as Figures 3 to 5 As shown, the first fluid channel 10 and the second fluid channel 20 can both be Tesla valve structures. In adjacent first fluid channels 10 and second fluid channels 20, the conduction directions of adjacent Tesla valve structures are opposite and their edges at least partially overlap, with the overlapping edges at least partially formed by a heat and moisture exchange membrane.

[0064] In embodiments of this application, the groove 41 can be a network of grooves, and the partition 40 can include teardrop-shaped protrusions formed by the grooves 41. Channels for various Tesla valve structures are formed between the heat and moisture exchange membrane and the protrusions. That is, the heat and moisture exchange membrane separates the groove 41 to form a first groove 411 and a second groove 412. The first groove 411 cooperates with the protrusions disposed therein to form a first fluid channel of the Tesla valve structure, and the second groove 412 cooperates with the protrusions disposed therein to form a second fluid channel of the Tesla valve structure.

[0065] In the embodiments of this application, the edges of adjacent Tesla valve structures can overlap to the maximum extent possible in adjacent first and second fluid channels. In actual use, the overlap of the edges of adjacent Tesla valve structures can be maximized based on actual conditions, such as the material and thickness of the heat and moisture exchange membrane, without affecting the use.

[0066] In embodiments of this application, the groove 41 and the protrusion disposed therein can be integrally formed. For example, the groove 41 and the protrusion are structural features on the partition 40 integrally formed with the main body of the partition 40.

[0067] In embodiments of this application, the heat and moisture exchange membrane can be fixed in the groove using ultrasonic welding. Using ultrasonic welding to fix the heat and moisture exchange membrane avoids the use of adhesives, thereby preventing volatile substances present in adhesives from evaporating into the room and posing a health risk to users.

[0068] In the embodiments of this application, the partition can be obtained from polymer materials such as polyethylene (PE), polypropylene (PP), and acrylonitrile butadiene styrene (ABS) through injection molding. The partition serves a supporting function, increasing the mechanical strength of the total heat exchange core.

[0069] In embodiments of this application, the heat and moisture exchange membrane may include fibers, such as a nonwoven membrane comprising fibers, or a nonwoven membrane comprising fibers formed by electrospinning.

[0070] In embodiments of this application, the raw materials for preparing the fiber may include fiber-forming material, solvent, and additives, wherein the additives may be selected from at least one of hydrophilic agents, surfactants, and antibacterial agents. Preferably, the raw materials for preparing the fiber may include 100 parts by weight of fiber-forming material, 500 to 50,000 parts by volume of solvent, 0.5 to 5 parts by weight of hydrophilic agent, 50 to 500 parts by weight of surfactant, and 0.5 to 5 parts by weight of antibacterial agent, wherein 1 part by weight: 1 part by volume is 1 g: 1 mL.

[0071] The embodiments of this application use the above-mentioned raw materials, and the combination with electrospinning process can achieve good mixing effect of raw materials, small amount of additives, and can obtain fibers with finer diameter by combining with electrospinning process.

[0072] In embodiments of this application, the fiber-forming material may include any one or more of natural cellulose, regenerated cellulose fibers and their derivatives.

[0073] For example, the natural cellulose can be lignocellulose or non-lignocellulose. As another example, the source of the lignocellulose can include coniferous wood, broadleaf wood, etc.; the source of the non-lignocellulose can include hemp, kenaf, bamboo, etc.; derivatives of regenerated cellulose fibers can be, for example, cellulose monoacetate, cellulose diacetate, cellulose triacetate, etc.

[0074] In embodiments of this application, the solvent may include any one or more of organic and inorganic solvents. The organic solvent may include dimethylacetamide (DMAc), acetone, dimethyl sulfoxide (DMSO), methanol, and ethanol. The inorganic solvent may include water, sodium hydroxide solution, etc. The solvent may also contain co-solvents such as lithium chloride and urea. For example, the solvent may be DMAc containing lithium chloride, an acetone / DMSO mixed solvent, an acetone / DMAc mixed solvent, or a NaOH solution containing urea.

[0075] In the embodiments of this application, the hydrophilic agent may include any one or more of inorganic acid salt hydrophilic agents, organic acid salt hydrophilic agents, polyol hydrophilic agents, and urea hydrophilic agents. For example, the inorganic acid salt hydrophilic agent may include nano-silica (SiO2), Al2O3, nano-montmorillonite, lithium chloride, calcium chloride, magnesium chloride, etc. The organic acid salt hydrophilic agent may include sodium lactate, calcium lactate, sodium pyrrolidone carboxylate, etc. The polyol hydrophilic agent may include glycerol, ethylene glycol, triethylene glycol, polyglycerol, etc. The urea hydrophilic agent may include urea, hydroxyethyl urea, etc.

[0076] It should be noted that calcium chloride and magnesium chloride have flame retardant properties. Therefore, when the hydrophilic agent contains calcium chloride and magnesium chloride, it can improve the flame retardancy of the heat and moisture exchange membrane and the total heat exchange core.

[0077] In the embodiments of this application, the hydrophilic agent can be a nano-scale hydrophilic agent, such as nano-silica, nano-montmorillonite, etc.

[0078] In embodiments of this application, the surfactant may include any one or more of anionic surfactants, cationic surfactants, zwitterionic surfactants, and nonionic surfactants. For example, the anionic surfactant may include alkyl sulfate salts, polyoxyethylene alkyl sulfate salts, alkylbenzene sulfonates, α-olefin sulfonates, etc.; the cationic surfactant may include alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, benzalkonium chloride, etc.; the zwitterionic surfactant may include trimethylglycine, alkyldimethylaminoacetic acid betaine, alkylamide dimethylaminoacetic acid betaine, etc.; the nonionic surfactant may include ethylene oxide adducts of ethynylene glycol, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene glycol and other polyoxyethylene polyoxypropylene ethers, fatty acid sorbitan esters, polyethylene glycol fatty acid esters and other fatty acid esters, alkyl monoglyceride ethers, alkyl polyglucosides, fatty acid diethanolamides, etc. Preferably, the surfactant may be a cationic surfactant, for example, it may include octadecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, etc.

[0079] In the embodiments of this application, the antibacterial agent may include one or more of organic antibacterial agents and inorganic antibacterial agents. For example, organic antibacterial agents may be selected from any one or more of sodium alginate, chitosan, etc., and inorganic antibacterial agents may be selected from any one or more of nano silver ions, nano zinc ions, and nano copper ions.

[0080] In embodiments of this application, the average diameter of the fiber can be from 20 nm to 50 nm. For example, the average diameter of the fiber can be 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, or 50 nm. Preferably, the average diameter of the fiber can be 50 nm.

[0081] In embodiments of this application, the main component of the heat and moisture exchange membrane may be cellulose fiber. In addition, the heat and moisture exchange membrane may also include other fibers besides cellulose fiber. Here, "main component" refers to a component that accounts for 50% or more of the total weight of the heat and moisture exchange membrane.

[0082] For example, in addition to cellulose fibers, the heat and moisture exchange membrane may also include any one or more synthetic fibers such as rayon fibers, polyethylene fibers, polypropylene fibers, and polyester fibers.

[0083] In the embodiments of this application, the thickness of the heat and moisture exchange membrane can be from 30 μm to 100 μm. For example, the thickness of the heat and moisture exchange membrane can be 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm. Preferably, the thickness of the heat and moisture exchange membrane is 60 μm. In the embodiments of this application, the average pore diameter of the heat and moisture exchange membrane can be from 200 nm to 300 nm. For example, the average pore diameter of the heat and moisture exchange membrane can be 200 nm, 210 nm, 220 nm, 230 nm, 240 nm, 250 nm, 260 nm, 270 nm, 280 nm, 290 nm, or 300 nm. Preferably, the average pore diameter of the heat and moisture exchange membrane is 300 nm.

[0084] Preferably, the average diameter of the fiber is 50 nm, the thickness of the heat and moisture exchange membrane is 60 μm, and the average pore diameter of the heat and moisture exchange membrane is 300 nm.

[0085] When the average fiber diameter, the thickness of the heat and moisture exchange membrane, and the average pore diameter are within the aforementioned ranges, the heat and water molecule exchange efficiency can be effectively improved under a lower pressure differential environment, while preventing the backflow of molecules such as carbon dioxide and VOCs. Based on existing technology, the desired average fiber diameter, heat and moisture exchange membrane thickness, and average pore diameter can be obtained by adjusting the fiber solution concentration, electrospinning process parameters such as spinning voltage, receiving distance, ambient temperature, and air humidity, and by adjusting the hot-pressing and molding conditions of the heat and moisture exchange membrane.

[0086] In the embodiments of this application, the heat and moisture exchange membrane may be a single-layer membrane.

[0087] Figure 6The flow direction of fresh air and exhaust air using cross ventilation in the total heat exchange core of this application embodiment; Figure 7 A top view of the exhaust duct in a cross-ventilation system; Figure 8 A top view of the fresh air duct in a cross-ventilation system; Figure 9 The flow direction of fresh air and exhaust air using the same-side ventilation method in the total heat exchange core of this application embodiment; Figure 10 A top view of the exhaust duct for a ventilation system on the same side; Figure 11 This is a top view of the fresh air duct for the same-side ventilation system.

[0088] from Figures 6 to 11 As can be seen, in the total heat exchange core of this application embodiment, fresh air and exhaust air can adopt either cross-ventilation or same-side ventilation. For example, pipes can be provided at both ends of the first fluid channel 10 to connect the fresh air inlet and fresh air outlet, and exhaust air inlet and exhaust air outlet can be provided at both ends of the second fluid channel 20. The fresh air entering from the outside and the air exhausted from the room exchange heat and moisture in the total heat exchange core. The fresh air inlet can be staggered from the fresh air outlet, and the fresh air inlet can be opposite to the exhaust air inlet, forming a cross-ventilation method. The fresh air inlet can be opposite to the fresh air outlet, and the fresh air inlet can be staggered from the exhaust air inlet, forming a same-side ventilation method.

[0089] This application also provides a method for manufacturing a total heat exchange core as described above. Figure 12 This is a process flow diagram illustrating the manufacturing method of the total heat exchange core according to an embodiment of this application. Figure 12 As shown, the manufacturing method includes:

[0090] A first fluid channel and a second fluid channel are formed in the total heat exchange unit;

[0091] The first fluid channel and the second fluid channel are separated by a heat and moisture exchange membrane to obtain a total heat exchange core.

[0092] In embodiments of this application, the method for manufacturing the total heat exchange core may include:

[0093] A partition is provided, and a groove is provided on the first surface of the partition;

[0094] The heat and moisture exchange membrane is molded to obtain a heat and moisture exchange membrane with a shape that matches the groove.

[0095] A heat and moisture exchange membrane having a shape that matches the groove is fixed in the groove, the heat and moisture exchange membrane dividing the groove into a first groove and a second groove;

[0096] When the total heat exchange core includes a total heat exchange unit, a cover plate is used to seal the groove of the partition plate, and the cover plate and the first groove of the partition plate cooperate to form a first fluid channel, and the cover plate and the second groove of the partition plate cooperate to form a second fluid channel, thus obtaining a total heat exchange core with a total heat exchange unit.

[0097] When the total heat exchange core includes multiple total heat exchange units, another partition is provided. The second plate of the other partition seals the groove on the first partition. The first groove cooperates with the second plate of the other partition to form a first fluid channel. The second groove cooperates with the second plate of the other partition to form a second fluid channel. A partition and the first and second fluid channels formed between the partition and its adjacent partitions constitute a total heat exchange unit.

[0098] Multiple partitions are arranged side by side to form multiple total heat exchange units. A cover plate is used to seal the first and second grooves of the outermost partition. The first groove of the outermost partition and the cover plate cooperate to form a first fluid channel, and the second groove of the outermost partition and the cover plate cooperate to form a second fluid channel, thus obtaining a total heat exchange core.

[0099] In the embodiments of this application, the heat and moisture exchange membrane can be fixed in the groove by welding, such as ultrasonic welding, laser welding, etc.

[0100] In embodiments of this application, the manufacturing method may further include, prior to forming the heat and moisture exchange membrane:

[0101] A cellulose solution is formed by mixing fiber-forming materials, hydrophilic agents, surfactants, solvents, and antibacterial agents.

[0102] A heat and moisture exchange membrane containing fibers is made from a cellulose solution using an electrospinning process.

[0103] The method for manufacturing the total heat exchange core in this application involves blending hydrophilic agents, surfactants, and antibacterial agents with fiber-forming materials and solvents to prepare fibers. Compared with traditional dispersion methods such as spraying or impregnation, the hydrophilic agents, surfactants, and antibacterial agents are more evenly distributed in the cellulose fibers, which can prolong the effective time of the heat and moisture permeation effect of the heat and moisture exchange membrane, and can avoid the waste of hydrophilic agents, surfactants, and antibacterial agents.

[0104] Compared with papermaking technology for preparing cellulose fibers, the method for manufacturing the total heat exchange core in this application uses electrospinning to prepare cellulose fibers, which results in lower losses and a simpler manufacturing process.

[0105] In the embodiments of this application, the process of forming the heat and moisture exchange membrane can be hot pressing, which gives the heat and moisture exchange membrane a shape that matches the groove.

[0106] In embodiments of this application, forming the fiber into a heat and moisture exchange membrane may include: receiving the fiber to form a heat and moisture exchange membrane using a receiving device, such that the fiber formed by electrospinning is deposited to form a membrane with a nonwoven fabric structure.

[0107] In embodiments of this application, the manufacturing method may include:

[0108] S10: Mix the fiber with the solvent, stir evenly, add the nano-hydrophilic agent, surfactant, and antibacterial agent, stir evenly again to obtain a cellulose solution;

[0109] S20: The cellulose solution obtained in step S10 is added to the injection container of the electrospinning equipment and spun into cellulose fibers with nanometer diameters according to certain process conditions. The cellulose fibers are then spun into a thin film with a certain thickness and porosity through a receiving device, namely a heat and moisture exchange membrane.

[0110] S30: The heat and moisture exchange membrane obtained in step S20 is hot-pressed into a certain shape at a certain temperature for a period of time using a hot-pressing process.

[0111] S40: Provide a partition plate, and set a groove on the first plate surface of the partition plate. Fix the heat and moisture exchange membrane formed in step S30 in the groove of the partition plate by ultrasonic welding. The shape of the groove matches the shape of the formed heat and moisture exchange membrane. The heat and moisture exchange membrane divides the groove into a first groove and a second groove.

[0112] S50: Provide another partition, and combine the second plate surface of the other partition with the first plate surface of the partition obtained in step S40, so as to seal the groove of the partition obtained in step S40 by using the second plate surface of the other partition. The first groove of the partition obtained in step S40 and the second plate surface of the other partition cooperate to form a first fluid channel. The second groove of the partition obtained in step S40 and the second plate surface of the other partition cooperate to form a second fluid channel. The partition obtained in step S40 and the first fluid channel and the second fluid channel formed in step S50 constitute a total heat exchange unit.

[0113] S60: Multiple total heat exchange units are arranged in parallel, and a cover plate is used to seal the first and second grooves of the outermost partition. The first groove of the outermost partition and the cover plate cooperate to form a first fluid channel, and the second groove of the outermost partition and the cover plate cooperate to form a second fluid channel, thus obtaining a total heat exchange core.

[0114] The fiber-forming material can be 100 parts by weight, the solvent can be 500 parts by volume to 50,000 parts by volume, the hydrophilic agent can be 0.5 parts by weight to 5 parts by weight, the surfactant can be 50 parts by weight to 500 parts by weight, and the antibacterial agent can be 0.5 parts by weight to 5 parts by weight, wherein 1 part by weight: 1 part by volume is 1 g: 1 mL.

[0115] This application also provides a fresh air unit, which includes the total heat exchange core provided in the above-described embodiments of this application.

[0116] The total heat exchange core of this application will be described below through specific embodiments. The manufacturing process of the total heat exchange core in the following embodiments is as follows:

[0117] S10: Mix the fiber with the solvent, stir evenly, add the nano-hydrophilic agent, surfactant, and antibacterial agent, stir evenly again to obtain a cellulose solution;

[0118] S20: The cellulose solution obtained in step S10 is added to the injection container of the electrospinning equipment and spun into cellulose fibers with nanometer diameters according to certain process conditions. The cellulose fibers are then spun into a thin film with a certain thickness and porosity through a receiving device, namely a heat and moisture exchange membrane.

[0119] S30: The heat and moisture exchange membrane obtained in step S20 is hot-pressed into a certain shape at a certain temperature for a period of time using a hot-pressing process.

[0120] S40: Provide a partition plate, and set a groove on the first plate surface of the partition plate. Fix the heat and moisture exchange membrane formed in step S30 in the groove of the partition plate by ultrasonic welding. The shape of the groove matches the shape of the formed heat and moisture exchange membrane. The heat and moisture exchange membrane divides the groove into a first groove and a second groove.

[0121] S50: Provide another partition, and combine the second plate surface of the other partition with the first plate surface of the partition obtained in step S40, so as to seal the groove of the partition obtained in step S40 by using the second plate surface of the other partition. The first groove of the partition obtained in step S40 and the second plate surface of the other partition cooperate to form a first fluid channel. The second groove of the partition obtained in step S40 and the second plate surface of the other partition cooperate to form a second fluid channel. The partition obtained in step S40 and the first fluid channel and the second fluid channel formed in step S50 constitute a total heat exchange unit.

[0122] S60: Multiple total heat exchange units are arranged in parallel, and a cover plate is used to seal the first and second grooves of the outermost partition. The first groove of the outermost partition and the cover plate cooperate to form a first fluid channel, and the second groove of the outermost partition and the cover plate cooperate to form a second fluid channel, thus obtaining a total heat exchange core.

[0123] Example 1

[0124] The fiber is made from the following raw materials: Fiber-forming material: microcrystalline cellulose, 100 parts by weight; Solvent: LiCl / DMAc (m LiCl :m DMAc =1:10), 2000 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano montmorillonite, 2 parts by weight; surfactant: octadecyltrimethylammonium chloride, 300 parts by weight; antibacterial agent: sodium alginate, 2 parts by weight.

[0125] The average diameter of the fiber obtained in this embodiment is 50 nm, the thickness of the heat and moisture exchange membrane is 60 μm, and the average pore diameter is 300 nm.

[0126] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0127] Example 2

[0128] The fiber is made from the following raw materials: Fiber-forming material: cellulose acetate, 100 parts by weight; Solvent: acetone / DMSO (v 丙酮 :v DMSO =2:1), 800 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano-montmorillonite, 2.5 parts by weight; surfactant: octadecyltrimethylammonium chloride, 250 parts by weight; antibacterial agent: sodium alginate, 2.5 parts by weight. The average diameter of the cellulose fibers obtained in this example is 40nm, the thickness of the heat and moisture exchange membrane is 80μm, and the average pore diameter is 250nm.

[0129] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0130] Example 3

[0131] The fiber is made from the following raw materials: Fiber-forming material: cellulose diacetate, 100 parts by weight; NaOH / urea (m NaOH :m 尿素 =1:10), 2500 parts by volume; hydrophilic agent: nano SiO2, 2 parts by weight; surfactant: dodecyltrimethylammonium chloride, 300 parts by weight; antibacterial agent: chitosan, 2 parts by weight; ultrapure water, 50000 parts by volume, of which 1 part by weight: 1 part by volume is 1g: 1mL.

[0132] The cellulose fibers prepared in this embodiment have an average diameter of 30 nm, the heat and moisture exchange membrane has a thickness of 30 μm, and the average pore diameter is 225 nm.

[0133] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0134] Example 4

[0135] The fiber is made from the following raw materials: Fiber-forming material: cellulose triacetate, 100 parts by weight; Solvent: acetone / DMAc (v 丙酮 :v DMAc =2:1), 700 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano SiO2, 3 parts by weight; surfactant: dodecyltrimethylammonium bromide, 250 parts by weight; antibacterial agent: chitosan, 2.5 parts by weight.

[0136] The cellulose fibers prepared in this embodiment have an average diameter of 20 nm, the heat and moisture exchange membrane has a thickness of 100 μm, and the average pore diameter is 200 nm.

[0137] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0138] Compare with Example 1

[0139] Fiber-forming material: microcrystalline cellulose, 100 parts by weight; Solvent: LiCl / DMAc (m LiCl :m DMAc =1:10), 2000 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano montmorillonite, 2 parts by weight; surfactant: octadecyltrimethylammonium chloride, 300 parts by weight; antibacterial agent: sodium alginate, 2 parts by weight.

[0140] The cellulose fibers prepared in this comparative example had an average diameter of 60 nm, a thickness of 110 μm in the heat and moisture exchange membrane, and an average pore diameter of 350 nm.

[0141] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0142] Compare with Example 2

[0143] Fiber-forming material: cellulose acetate, 100 parts by weight; Solvent: acetone / DMSO (v 丙酮 :v DMSO =2:1), 800 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano montmorillonite, 2.5 parts by weight; surfactant: octadecyltrimethylammonium chloride, 250 parts by weight; antibacterial agent: sodium alginate, 2.5 parts by weight.

[0144] The cellulose fibers prepared in this comparative example had an average diameter of 55 nm, a heat and moisture exchange membrane thickness of 115 μm, and an average pore diameter of 320 nm.

[0145] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0146] Compare with Example 3

[0147] Cellulose fibers are made from the following raw materials:

[0148] Fiber-forming material: cellulose diacetate, 100 parts by weight; NaOH / urea (m NaOH :m 尿素 =1:10), 2500 parts by volume; hydrophilic agent: nano SiO2, 2 parts by weight; surfactant: dodecyltrimethylammonium chloride, 300 parts by weight; antibacterial agent: chitosan, 2 parts by weight; ultrapure water, 50000 parts by volume, of which 1 part by weight: 1 part by volume is 1g: 1mL.

[0149] The cellulose fibers prepared in this comparative example had an average diameter of 120 nm, a heat and moisture exchange membrane thickness of 155 μm, and an average pore diameter of 360 nm.

[0150] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0151] Compare with Example 4

[0152] The fiber is made from the following raw materials:

[0153] Fiber-forming material: cellulose triacetate, 100 parts by weight; Solvent: acetone / DMAc (v LiCl :v DMAc =2:1), 700 parts by volume (1 part by weight: 1 part by volume is 1g:1mL); hydrophilic agent: nano-SiO2, 3 parts by weight; surfactant: dodecyltrimethylammonium bromide, 250 parts by weight; antibacterial agent: chitosan, 2.5 parts by weight. The average diameter of the cellulose fibers obtained in this comparative example is 300nm, the thickness of the heat and moisture exchange membrane is 162μm, and the average pore diameter is 350nm;

[0154] The heat and moisture exchange performance of the obtained heat and moisture exchange membrane is shown in Table 1.

[0155] Compare with Example 5

[0156] Commercial paper-based heat and moisture exchange membranes are selected, with bamboo pulp as the raw material, obtained through papermaking processes.

[0157] Compare with Example 6

[0158] Commercial polyester heat and moisture exchange membranes are selected, with raw materials being ABS and nano-membranes, and are formed using injection molding.

[0159] Table 1 Comparison of performance data of the thin films in the examples and comparative examples.

[0160]

[0161]

[0162] As can be seen, compared with the heat and moisture exchange membrane of the comparative example, the heat and moisture exchange membrane of the present application embodiment has a significantly higher water vapor permeation rate, sensible heat efficiency, latent heat efficiency and enthalpy efficiency within a specific range of fiber diameter, membrane thickness and pore diameter. This indicates that the fluid flow efficiency and heat and moisture exchange efficiency of the heat and moisture exchange membrane of the present application embodiment are significantly higher.

[0163] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A total heat exchange core, characterized by, include: The total heat exchange unit has a first fluid channel and a second fluid channel. Both the first fluid channel and the second fluid channel are sealed unidirectional fluid channels. The conduction directions of the first fluid channel and the second fluid channel are opposite. The first fluid channel and the second fluid channel are separated by a heat and moisture exchange membrane and exchange heat and moisture. The total heat exchange unit includes a partition plate. A groove is provided on the first plate surface of the partition plate. The heat and moisture exchange membrane is provided in the groove to divide the groove into a first groove and a second groove. Both the first fluid channel and the second fluid channel are Tesla valve structures.

2. The total heat exchange core of claim 1, wherein, The total heat exchange unit is provided at least one; when there are multiple total heat exchange units, multiple partitions are arranged side by side, a first groove of one partition and a second plate surface of an adjacent partition are engaged to form a first fluid channel, and a second groove of one partition and a second plate surface of an adjacent partition are engaged to form a second fluid channel.

3. The total heat exchange core of claim 2, wherein, It also includes a cover plate located on one side of the total heat exchange core, and the cover plate cooperates with a first groove of the adjacent partition plate to form the first fluid channel, and the cover plate cooperates with a second groove of the adjacent partition plate to form the second fluid channel.

4. The total heat exchange core of claim 2, wherein, In adjacent first and second fluid channels, the conduction directions of adjacent Tesla valve structures are opposite and their edges at least partially overlap, the overlapping edges being at least partially formed by the heat and moisture exchange membrane.

5. The total heat exchange core of claim 4, wherein, The groove is a network of grooves, and the partition includes teardrop-shaped protrusions formed by the grooves. The channel of the Tesla valve structure is formed between the heat and moisture exchange membrane and the protrusions.

6. The total heat exchange core of claim 4, wherein, In adjacent first and second fluid channels, the edges of adjacent Tesla valve structures overlap to the maximum extent.

7. A total heat exchanger core as defined in any one of claims 2 to 6, characterised in that, The partition is made of plastic; the heat and moisture exchange membrane includes fibers, the raw materials for preparing the fibers include fiber-forming materials, solvents and additives, the additives being selected from at least one of hydrophilic agents, surfactants and antibacterial agents.

8. The total heat exchange core of claim 7, wherein, The average diameter of the fiber is 20 nm to 50 nm.

9. The total heat exchange core of claim 7, wherein, The thickness of the heat and moisture exchange membrane is 30 μm to 100 μm, and the average pore diameter is 200 nm to 300 nm.

10. The total heat exchange core of claim 7, wherein, The raw materials for preparing the fiber include: 100 parts by weight of fiber-forming material, 500 to 50,000 parts by volume of solvent, 0.5 to 5 parts by weight of hydrophilic agent, 50 to 500 parts by weight of surfactant, and 0.5 to 5 parts by weight of antibacterial agent, wherein 1 part by weight: 1 part by volume is 1 g: 1 mL.

11. The method for manufacturing a total heat exchange core as described in any one of claims 1 to 10, characterized in that, include: A partition is provided, and a groove is provided on the first surface of the partition; The heat and moisture exchange membrane is shaped to match the groove. The formed heat and moisture exchange membrane is fixed in the groove, and the heat and moisture exchange membrane divides the groove into a first groove and a second groove. The total heat exchange core is obtained by sealing the groove of the partition with a cover plate, wherein the cover plate and the first groove of the partition plate cooperate to form the first fluid channel, and the cover plate and the second groove of the partition plate cooperate to form the second fluid channel; or, another partition plate is provided, and the groove is sealed with the second plate surface of the other partition plate, wherein the second plate surface of the other partition plate cooperates with the first groove to form the first fluid channel, and the second plate surface of the other partition plate cooperates with the second groove to form the second fluid channel. A partition plate and the first fluid channel and the second fluid channel formed between the partition plate and the adjacent partition plate constitute a total heat exchange unit. Multiple partition plates are arranged side by side to form multiple total heat exchange units. The groove of the outermost partition plate is sealed with a cover plate, wherein the cover plate and the first groove of the outermost partition plate cooperate to form the first fluid channel, and the cover plate and the second groove of the outermost partition plate cooperate to form the second fluid channel, thereby obtaining the total heat exchange core.

12. The manufacturing method as described in claim 11, characterized in that, The heat and moisture exchange membrane is fixed in the groove by welding.

13. The manufacturing method as described in claim 11, characterized in that, The process for forming the heat and moisture exchange membrane is hot pressing.

14. The manufacturing method according to any one of claims 11 to 13, characterized in that, Before forming the heat and moisture exchange membrane, the method further includes: A cellulose solution is obtained by mixing the fiber-forming material, solvent, hydrophilic agent, surfactant, and antibacterial agent. The cellulose solution was processed into a heat and moisture exchange membrane containing fibers using an electrospinning process.

15. A fresh air ventilator, characterized in that, Includes a total heat exchange core as described in any one of claims 1 to 10.

Images