Variable physical property working medium heat exchanger and manufacturing process method thereof

Abstract

The invention relates to a variable physical property working medium heat exchanger and a manufacturing process method thereof, and the manufacturing process method comprises the following steps: 1) designing the heat exchanger according to heat exchange requirements; 2) confirming the inlet temperature and the outlet temperature of the working medium; and (3) according to physical property parameter changes caused by temperature changes after heat exchange of the working medium, heat exchange elements with different heat exchange capacities and resistance characteristics are arranged or developed in the flowing direction of the working medium, and redistribution of flow resistance and heat is achieved. The influence of temperature change on the physical property of the working medium is fully considered, the heat exchange elements are arranged in a targeted mode in the medium flowing direction, heat transfer deterioration or flow resistance deterioration caused by the physical property change can be adapted or compensated, and therefore the problems that the variable-physical-property working medium is large in resistance and high in energy consumption, and the heat exchange performance is not matched with a heat exchanger are solved or partially solved.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger manufacturing, and in particular to a variable property working medium heat exchanger and a manufacturing process method thereof. Background Art

[0002] As the main equipment for improving energy utilization, heat exchangers are gaining more and more attention. Heat exchangers are the core equipment of industrial thermal management systems and are widely used in aerospace, shipbuilding, nuclear energy, chemical and other industrial sectors. Heat exchangers transfer heat from the high-temperature side fluid to the low-temperature side fluid, so that the fluid temperature reaches the specified index of the process and improves energy utilization.

[0003] At present, the design of heat exchangers generally complies with the industry specifications and standards of heat exchangers. However, during the heat exchange process, the physical properties of many fluids will change drastically, causing the heat transfer performance to not match the heat exchanger, resulting in deterioration of heat transfer or flow resistance, and increasing the energy consumption of the heat exchanger.

[0004] Therefore, how to improve the technical defects existing in the prior art has always been a problem that ordinary technicians in this field need to solve urgently. Summary of the invention

[0005] The purpose of this application is to provide a variable property working medium heat exchanger and its manufacturing process method, which fully considers the influence of temperature change on the property of the working medium, can adapt to or compensate for the deterioration of heat transfer or flow resistance caused by the change of property, and solves the shortcomings of variable property working medium with high resistance and energy consumption.

[0006] The technical solution provided by the present invention is as follows:

[0007] A manufacturing process for a variable property working medium heat exchanger, comprising the steps of:

[0008] 1) Design the heat exchanger according to the heat exchange requirements;

[0009] 2) Confirm the inlet temperature and outlet temperature of the working medium;

[0010] 3) According to the changes in physical parameters caused by the temperature change of the working medium after heat exchange, heat exchange elements with different heat exchange capacities and resistance characteristics are arranged or developed along the flow direction of the working medium to achieve redistribution of flow resistance and heat.

[0011] In some embodiments, the physical property parameters in step 3) include the kinematic viscosity of the working medium, and the kinematic viscosity changes monotonically with temperature.

[0012] In some embodiments, the step 3) further comprises the steps of:

[0013] Based on the inlet temperature and outlet temperature of the working medium, the average temperature is calculated, and the heat exchange area is divided into an inlet section and an outlet section based on the average temperature;

[0014] Look up the table to obtain the kinematic viscosity of the working medium at the inlet temperature and average temperature, and judge the kinematic viscosity of the inlet and outlet of the inlet section;

[0015] According to the judgment results, heat exchange elements with different heat exchange capacities and resistance characteristics are arranged or developed to achieve redistribution of flow resistance and heat.

[0016] In some embodiments, the arrangement or development of heat exchange elements with different heat exchange capacities and resistance characteristics according to the judgment result to achieve redistribution of flow resistance and heat includes:

[0017] If the inlet kinematic viscosity of the inlet section is less than the outlet kinematic viscosity, the inlet section will enhance heat exchange and the outlet section will reduce resistance; if the inlet kinematic viscosity is greater than the outlet kinematic viscosity, the inlet section will reduce resistance and the outlet section will enhance heat exchange.

[0018] In some embodiments, enhancing heat exchange includes: reducing the spacing between the enhanced heat exchange elements, and / or increasing the density of the spoilers;

[0019] Reducing the resistance includes: increasing the spacing between the enhanced heat exchange elements, and / or reducing the density of the spoilers.

[0020] In some embodiments, the step 3) further comprises the following steps:

[0021] 4) confirm the performance parameters of the heat exchanger at the inlet section and the outlet section after the flow resistance and heat are redistributed, and calculate the ratio of the performance parameters to the performance parameters of the heat exchanger at the inlet section and the outlet section before the redistribution;

[0022] 5) Based on the calculated ratio, determine whether further segment optimization is needed.

[0023] In some embodiments, the performance parameter in step 4) includes flow pressure drop or heat exchange capacity.

[0024] In some embodiments, the redistribution of flow resistance and heat is achieved by reducing resistance, and the performance parameter is flow pressure drop; and, if the ratio in step 5) is ≥97%, no optimization is required, and if the ratio in step 5) is <97%, re-enter step 3) for further segmented optimization.

[0025] In some embodiments, the redistribution of flow resistance and heat is achieved by enhancing heat exchange, and the performance parameter is the heat exchange rate; and, if the ratio in step 5) is ≤101.5%, no optimization is required; if the ratio in step 5) is >101.5%, re-enter step 3) for further segmented optimization.

[0026] The present application also provides a variable property working medium heat exchanger, which is manufactured using the manufacturing process provided in any of the above embodiments.

[0027] The technical effects of this application are:

[0028] 1. In this application, the heat exchanger is first designed according to the traditional design method, and then the inlet temperature and outlet temperature of the working medium are determined, fully considering the impact of temperature changes on the physical properties of the working medium, so as to arrange or develop heat exchange elements with different heat exchange capacities and resistance characteristics in a targeted manner to adapt to or compensate for the deterioration of heat transfer or flow resistance caused by physical property changes, and solve or partially solve the problems of high resistance and high energy consumption of the working medium with variable physical properties, and the mismatch between heat exchange performance and heat exchanger. This application can achieve precise matching of the heat exchange process between the heat exchanger and the working medium by directly arranging and designing the heat exchange elements. At the same time, because the heat exchanger made by this manufacturing process method has higher heat exchange efficiency and low energy consumption, it can also reduce long-term operating costs and has strong practicality.

[0029] 2. The physical property parameter used in the manufacturing process disclosed in this application is the kinematic viscosity of the working medium, which changes monotonically with temperature. In this regard, this application adopts a segmented optimization operation, first using the dichotomy method, with the average value of the inlet temperature and the outlet temperature as the boundary, to divide the heat exchange zone into the inlet section and the outlet section, compare the kinematic viscosity of the inlet and outlet of the inlet section, and adjust the spacing of the enhanced heat exchange elements, the density of the spoilers, etc. according to the comparison results to achieve the redistribution of flow resistance and heat, which is convenient and fast to calculate, and is conducive to the rapid design and optimization of the variable physical property working medium heat exchanger.

[0030] 3. In this application, after the heat exchanger is optimized, a performance parameter comparison will be performed to calculate the ratio of the performance parameters of the heat exchanger after optimization to the performance parameters of the heat exchanger before optimization to confirm whether further segmented optimization is needed for specific sections. This is more conducive to the precise matching of the heat exchange process between the heat exchanger and the working medium, has strong practicality, and better optimization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0032] Figure 1 is a process flow chart of a manufacturing process method of a variable property working medium heat exchanger provided in one embodiment of the present application;

[0033] Figure 2 is a schematic diagram of pressure drop optimization of a heat exchanger provided in one embodiment of the present application;

[0034] Figure 3 is a schematic diagram of heat transfer coefficient optimization of a heat exchanger provided in one embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of heat optimization of a heat exchanger provided in one embodiment of the present application. DETAILED DESCRIPTION

[0036] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other accompanying drawings and other implementation methods can be obtained based on these drawings without creative work.

[0038] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0039] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various components of the present application are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.

[0042] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] In view of the problems in the prior art such as the mismatch between heat exchange performance and heat exchanger caused by variable property working medium, which leads to deterioration of heat transfer or flow resistance, and increased energy consumption of heat exchanger, the present application provides a manufacturing process method for a heat exchanger with a variable property working medium. The manufacturing process method is suitable for occasions with variable property working medium, can be used for design optimization of conventional uniform structure heat exchangers, and can also be used for the design and development of new heat exchangers.

[0044] See also Figure 1 The manufacturing process method may specifically include the following steps: 1) designing a heat exchanger according to heat exchange requirements; 2) confirming the inlet temperature and outlet temperature of the working medium; 3) arranging or developing heat exchange elements with different heat exchange capacities and resistance characteristics along the flow direction of the working medium according to the changes in physical parameters caused by the temperature changes after heat exchange of the working medium, so as to realize the redistribution of flow resistance and heat.

[0045] In this embodiment, the heat exchanger is first designed using the traditional design method, and then the inlet temperature and outlet temperature of the working medium are determined, fully considering the influence of temperature changes on the physical properties of the working medium, so as to arrange or develop heat exchange elements with different heat exchange capacities and resistance characteristics in a targeted manner to adapt to or compensate for the deterioration of heat transfer or flow resistance caused by the change in physical properties, thereby solving or partially solving the problems of high resistance and energy consumption of the working medium with variable physical properties, and mismatch between heat exchange performance and heat exchanger.

[0046] The manufacturing process provided in this embodiment is to arrange and design the heat exchange element directly according to the change of physical parameters caused by temperature, which is conducive to achieving accurate matching of the heat exchange process between the heat exchanger and the working medium. At the same time, because the heat exchanger made by this manufacturing process has higher heat exchange efficiency and low energy consumption, it can also reduce long-term operating costs and has strong practicality.

[0047] In a specific embodiment, the physical property parameter used in step 3) of the manufacturing process method is the kinematic viscosity of the working medium, which is suitable for situations where the kinematic viscosity of the working medium changes monotonically with temperature. For example, when the working medium is hydraulic oil or lubricating oil, the kinematic viscosity of the working medium gradually increases as the temperature decreases.

[0048] Specifically, in the process of arranging or developing heat exchange elements with different heat exchange capabilities and resistance characteristics according to the changes in physical property parameters, the average temperature can be calculated first based on the inlet temperature and outlet temperature of the working medium. For example, when the inlet temperature is T1 and the outlet temperature is T2, the average temperature is: Tm = (T1 + T2) / 2. Subsequently, based on the calculated average temperature Tm, the heat exchange section is divided into an inlet section and an outlet section.

[0049] Look up the table to obtain the kinematic viscosities of the working medium at the inlet temperature T1 and the average temperature Tm. For example, the kinematic viscosity at the inlet temperature T1 is ν1, and the kinematic viscosity at the average temperature Tm is ν m . Then, judge the magnitudes of the kinematic viscosities at the inlet and outlet of the inlet section. According to the judgment results, arrange or develop heat exchange elements with different heat exchange capabilities and resistance characteristics, so as to achieve the redistribution of flow resistance and heat.

[0050] In this embodiment, the physical property parameter adopted is the kinematic viscosity of the working medium, which changes monotonically with temperature. For this, the present application adopts a segmented optimization operation. First, use the bisection method to divide the heat exchange section into an inlet section and an outlet section with the average value Tm of the inlet temperature T1 and the outlet temperature T2 as the boundary. Then, compare the magnitudes of the kinematic viscosities at the inlet and outlet of different sections. Since the kinematic viscosity of the working medium changes monotonically with temperature, when we actually compare, we only need to compare the kinematic viscosities at the inlet and outlet of the inlet section to analyze and obtain the kinematic viscosities at the inlet and outlet of the outlet section. For example, compare the magnitudes between v1 and v m . If v1 < v m , correspondingly, v m < v2; if v1 > v m , then, v m > v2. Then, adjust the spacing of the enhanced heat exchange elements, the density of the flow disturbing elements, etc. according to the comparison results to achieve the redistribution of flow resistance and heat. The whole process is convenient and fast in calculation, and is more conducive to the rapid design and optimization of heat exchangers with variable physical property working media.

[0051] Of course, in the actual design and optimization process, it is also possible to only compare the magnitudes between v m and v2, which is not limited here and is within the protection scope of the present application.

[0052] Specifically, for the occasion where the kinematic viscosity of the working medium increases after cooling, if v1 < v m , then enhance heat exchange in the inlet section and reduce resistance in the outlet section; if v1 > v m , then reduce resistance in the inlet section and enhance heat exchange in the outlet section.

[0053] Among them, enhanced heat exchange can be achieved by reducing the spacing of enhanced heat exchange elements, increasing the density of spoilers, and increasing the compactness of heat exchange elements; reduced resistance can be achieved by increasing the spacing of enhanced heat exchange elements, reducing the density of spoilers, and reducing the compactness of heat exchange elements, which is easy to operate. Through the above optimization measures, enhanced heat exchange in low flow resistance areas and reduced resistance in high flow resistance areas can be achieved, thereby completing the redistribution of flow resistance and heat.

[0054] In an exemplary embodiment, the manufacturing process method of a variable property working medium heat exchanger, after completing the segmented optimization in step 3), may further include the steps of: 4) confirming the performance parameters of the heat exchanger at the inlet section and the outlet section after the redistribution of flow resistance and heat, and respectively calculating the ratio of the performance parameters to the performance parameters of the heat exchanger at the inlet section and the outlet section before the redistribution of flow resistance and heat (i.e., the heat exchanger before this optimization); 5) based on the calculated ratio, determining whether it is necessary to further perform segmented optimization on the corresponding inlet section and outlet section.

[0055] After the heat exchanger is optimized, this embodiment also compares the performance parameters before and after the optimization, and calculates the ratio of the performance parameters of the heat exchanger after optimization to the performance parameters of the heat exchanger before optimization to confirm whether further segmented optimization is required for specific sections, which is more conducive to the precise matching of the heat exchange process between the heat exchanger and the working medium, has strong practicality, and better optimization effect.

[0056] The performance parameters of the heat exchanger can be found in Figures 2 to 4 The performance parameter curve diagram shown in FIG. 1 , wherein the dotted line shows the expected adjustment effect after optimization.

[0057] Figure 2 The diagram shows the optimization diagram of the fluid pressure drop of the heat exchanger. The fluid pressure drop of the heat exchanger refers to the phenomenon that the fluid pressure decreases in the heat exchanger due to the resistance encountered when the fluid passes through the heat exchange element. The fluid pressure drop directly affects the working efficiency of the heat exchanger and the flow state of the fluid. In practical applications, the fluid pressure drop will be controlled within a reasonable range to ensure sufficient heat exchange efficiency while reducing the pressure drop as much as possible. Therefore, it is of great significance to analyze and calculate the fluid pressure drop.

[0058] Figure 3 The heat transfer coefficient optimization diagram of the heat exchanger is shown. The heat transfer coefficient is an important parameter that describes the heat transfer effect between the fluid and the solid surface. It indicates the rate at which heat is transferred per unit area on both sides of the heat exchanger per unit time. The heat transfer coefficient is very important in engineering and is directly related to the heat transfer efficiency and design size of the heat exchanger. When designing a heat exchanger, it is necessary to select a suitable heat transfer coefficient according to the specific working conditions and fluid properties to achieve the best heat exchange effect. Therefore, it is also important to analyze and calculate the heat transfer coefficient.

[0059] Figure 4 The heat transfer optimization diagram of the heat exchanger is shown. The heat transfer is a key parameter to measure the performance of the heat exchanger. It indicates the size (or amount) of heat transferred from one fluid to another. The higher the heat transfer of the heat exchanger, the more heat is transferred under the same inlet boundary conditions. This is usually a positive feature because it indicates that the heat exchanger has a higher heat transfer capacity. However, a higher heat transfer may require higher pumping energy consumption. Therefore, when designing a heat exchanger, it is necessary to comprehensively consider multiple factors such as heat transfer efficiency, energy consumption, cost and safety, and select the best performance and efficiency based on actual process requirements and economic considerations to achieve the best balance point. It can be seen that the analysis and calculation of the heat transfer is also of great significance.

[0060] Depend on Figures 2 to 4 It can be seen that the optimized heat exchanger has higher heat exchange efficiency and lower energy consumption, and can achieve the best heat exchange effect at a lower operating cost.

[0061] Specifically, the performance parameter in step 4) may include flow pressure drop or heat exchange. If the optimization adopts the method of reducing resistance to achieve the redistribution of flow resistance and heat, then the performance parameter adopts flow pressure drop. When the ratio in step 5) is ≥97%, no optimization is required. When the ratio is <97%, step 2) is re-entered to further optimize the corresponding inlet section and outlet section in sections.

[0062] For example, if the ratio of the flow pressure drop of the optimized inlet section to the flow pressure drop of the inlet section before this optimization is ≥97%, there is no need to adjust the heat exchange elements in the inlet section. On the contrary, if the ratio of the flow pressure drop of the optimized inlet section to the flow pressure drop of the inlet section before this optimization is <97%, it is necessary to continue to follow the above segmentation method and re-follow the steps of step 2) to establish the inlet temperature T1 and outlet temperature T2 of the inlet section (the value of T2 here can be the value of the previous Tm), and divide the inlet section into two sections with the average value Tm calculated by the newly established T1 and T2 as the boundary, optimize the layout of the heat exchange elements in the inlet section, and after the optimization again, it is still necessary to compare the performance parameters according to steps 4) and 5).

[0063] In contrast, if enhanced heat exchange is used during optimization to achieve redistribution of flow resistance and heat, then the performance parameter uses the heat exchange rate. At this time, if the ratio in step 5) is ≤101.5%, no optimization is required. If the ratio in step 5) is >101.5%, it is necessary to re-enter step 2) for further segmented optimization.

[0064] For example, if the ratio of the heat exchange of the optimized inlet section to the heat exchange of the inlet section before this optimization is ≤101.5%, there is no need to adjust the heat exchange elements in the inlet section. On the contrary, if the ratio of the flow pressure drop of the optimized inlet section to the heat exchange of the inlet section before this optimization is greater than 101.5%, it is necessary to continue to follow the above segmentation method and re-follow the steps of step 2) to establish the inlet temperature T1 and outlet temperature T2 of the inlet section (the value of T2 here can be the value of Tm before), and divide the inlet section into two sections with the average value Tm calculated by the newly established T1 and T2 as the boundary, optimize the layout of the heat exchange elements in the inlet section, and after the optimization again, it is still necessary to compare the performance parameters with the section before this optimization according to steps 4) and 5).

[0065] After the heat exchange elements of each section in the heat exchanger are arranged, the designs of each section are summarized to complete the design and manufacture of the entire heat exchanger.

[0066] The manufacturing process method of the variable property working medium heat exchanger disclosed in the present application achieves a more reasonable distribution of the heat exchange capacity and flow resistance of the heat exchanger by adjusting the spacing of the enhanced heat exchange elements, the density of the spoilers, and other measures according to the changing trend of the viscosity of the working medium with the temperature, so that the heat exchange efficiency of the heat exchanger is higher and the energy consumption is lower, thereby realizing a precise match between the heat exchange equipment and the heat exchange process of the working medium.

[0067] The present application also provides a heat exchanger with a variable property working medium, which is manufactured using the manufacturing process provided by any of the above embodiments, and can adapt to or compensate for the deterioration of heat transfer or flow resistance caused by changes in physical properties, thereby solving or partially solving the problems of high resistance and energy consumption of the variable property working medium, and mismatch between heat exchange performance and the heat exchanger.

[0068] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0069] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of this application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be regarded as the protection scope of this application.

Claims

1. A manufacturing process for a variable property working medium heat exchanger, characterized in that: Includes steps: 1) Design the heat exchanger according to the heat exchange requirements; 2) Confirm the inlet temperature and outlet temperature of the working medium; 3) According to the changes in physical parameters caused by the temperature change of the working medium after heat exchange, heat exchange elements with different heat exchange capacities and resistance characteristics are arranged or developed along the flow direction of the working medium to achieve redistribution of flow resistance and heat.

2. The manufacturing process of the variable property working medium heat exchanger according to claim 1, characterized in that: The physical property parameters in step 3) include the kinematic viscosity of the working medium, and the kinematic viscosity changes monotonically with temperature.

3. The manufacturing process of the variable property working medium heat exchanger according to claim 2, characterized in that: The step 3) further comprises the steps: Based on the inlet temperature and outlet temperature of the working medium, the average temperature is calculated, and the heat exchange area is divided into an inlet section and an outlet section based on the average temperature; Look up the table to obtain the kinematic viscosity of the working medium at the inlet temperature and average temperature, and judge the kinematic viscosity of the inlet and outlet of the inlet section; According to the judgment results, heat exchange elements with different heat exchange capacities and resistance characteristics are arranged or developed to achieve redistribution of flow resistance and heat.

4. The manufacturing process of the variable property working medium heat exchanger according to claim 3 is characterized in that: The arrangement or development of heat exchange elements with different heat exchange capacities and resistance characteristics according to the judgment results to achieve redistribution of flow resistance and heat includes: If the inlet kinematic viscosity of the inlet section is less than the outlet kinematic viscosity, the inlet section will enhance heat exchange and the outlet section will reduce resistance; if the inlet kinematic viscosity is greater than the outlet kinematic viscosity, the inlet section will reduce resistance and the outlet section will enhance heat exchange.

5. The manufacturing process of the variable property working medium heat exchanger according to claim 4, characterized in that: Intensifying heat exchange includes: reducing the spacing between the heat exchange enhancement elements, and / or increasing the density of the spoilers; Reducing the resistance includes: increasing the spacing between the enhanced heat exchange elements, and / or reducing the density of the spoilers.

6. The manufacturing process of the variable property working medium heat exchanger according to claim 4 or 5, characterized in that: The step 3) further comprises the following steps: 4) confirm the performance parameters of the heat exchanger at the inlet section and the outlet section after the flow resistance and heat are redistributed, and calculate the ratio of the performance parameters to the performance parameters of the heat exchanger at the inlet section and the outlet section before the redistribution; 5) Based on the calculated ratio, determine whether it is necessary to further optimize the inlet and outlet sections.

7. The manufacturing process of the variable property working medium heat exchanger according to claim 6, characterized in that: The performance parameters in step 4) include flow pressure drop or heat exchange capacity.

8. The manufacturing process of the variable property working medium heat exchanger according to claim 7, characterized in that: The redistribution of flow resistance and heat is achieved by reducing resistance, and the performance parameter is flow pressure drop; and if the ratio in step 5) is ≥97%, no optimization is required; if the ratio in step 5) is <97%, re-enter step 2) for further segmented optimization.

9. The manufacturing process of the variable property working medium heat exchanger according to claim 7, characterized in that: The redistribution of flow resistance and heat is achieved by enhancing heat exchange, and the performance parameter is the heat exchange amount; and if the ratio in step 5) is ≤101.5%, no optimization is required; if the ratio in step 5) is >101.5%, re-enter step 2) for further segmented optimization.

10. A variable property working medium heat exchanger, characterized in that: It is manufactured by the manufacturing process described in any one of claims 1 to 9.

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