Gyroid type three-period minimal surface primary surface heat exchanger based on compression method

Abstract

A Gyroid-type three-period minimal surface primary surface heat exchanger based on a compression method belongs to the technical field of heat exchangers. In order to solve the problem of optimizing a typical Gyroid-type TPMS to improve the heat exchange performance of a heat exchanger, the technical key point is that a compressed Gyroid-type three-period minimal surface core is arranged in the accommodating space, and is compressed and formed in any coordinate axis direction by the Gyroid-type three-period minimal surface core. A low-temperature working fluid channel opening and a high-temperature working fluid channel opening are formed on the surface of the compressed Gyroid-type three-period minimal surface core, and a low-temperature working fluid channel and a high-temperature working fluid channel are formed inside. The core can be used for oil cooling in the petrochemical industry, and the effect is that the heat exchanger reduces the spanwise pressure drop and increases the heat exchange capacity. This optimization significantly improves the heat exchange effect of the heat exchanger.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers and relates to a Gyroid-type three-period minimal surface primary surface heat exchanger based on a compression method. Background Art

[0002] In the petrochemical industry, cooling oil products is a crucial production process. Water and other working fluids are typically used for cooling oil products, and heat exchangers are crucial for heat exchange. Heat exchangers play an indispensable role in the petrochemical industry. Effectively utilizing heat exchangers can improve production efficiency, reduce energy consumption, and minimize environmental pollution. For example, in the refining process, heat exchangers are widely used in areas such as crude oil heating, refinery heating, and gas recovery, significantly reducing energy consumption and improving production efficiency.

[0003] A typical Gyroid-type TPMS structure is used in heat exchangers. For example, CN116933527A, a method and system for designing efficient heat exchanger flow channels based on implicit fields, discloses the selection of a Gyroid-type three-periodic minimal surface as the internal filling structure of the heat exchanger. However, the typical Gyroid-type TPMS still has room for optimization in terms of pressure drop and heat transfer performance. Summary of the Invention

[0004] In order to solve the problem of optimizing a typical Gyroid-type TPMS to improve the heat exchange performance of a heat exchanger, a Gyroid-type three-periodic minimal surface primary surface heat exchanger based on a compression method in some embodiments of the present application includes:

[0005] a housing, the housing being formed with a low-temperature working medium inlet and a low-temperature working medium outlet arranged opposite to each other in a first direction, a high-temperature working medium inlet and a high-temperature working medium outlet arranged opposite to each other in a second direction, and an accommodating space, wherein the first direction intersects the second direction;

[0006] A compressed Gyroid-type three-period minimal surface core is disposed in the accommodating space and is formed by compression of the Gyroid-type three-period minimal surface core in any coordinate axis direction. A low-temperature working fluid channel opening and a high-temperature working fluid channel opening are formed on the surface of the compressed Gyroid-type three-period minimal surface core, and a low-temperature working fluid channel and a high-temperature working fluid channel are formed inside the core.

[0007] The basic governing equation of the Gyroid-type three-periodic minimal surface core is:

[0008] sinXcosY+sinYcosZ+sinZcosX=c;

[0009] Where X = 2απx, Y = 2βπy, Z = 2γπz, where x, y, and z are the coordinates of the x-axis, y-axis, and z-axis of the spatial rectangular coordinate system established by the lattice cell, α, β, and γ are coefficients used to control the size of the lattice cell in the corresponding x-axis, y-axis, and z-axis directions, and c is a constant used to control the porosity of the overall structure;

[0010] The compressed Gyroid-type three-periodic minimal surface core is obtained by structurally compressing the Gyroid-type three-periodic minimal surface core in a single coordinate axis direction, wherein the compression is to adjust the coefficient of the size of the lattice cell in the single coordinate axis direction to be greater than the coefficients of the size of the lattice cell in the other two coordinate axis directions, and the coefficients of the size of the lattice cell in the other two coordinate axis directions are equal;

[0011] The compression direction is the x-axis direction, α=2, β=1, γ=1, and c=0.438.

[0012] According to the Gyroid-type three-periodic minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the coefficient of the size of the lattice cell in the direction of the single coordinate axis is an integer multiple of the coefficients of the size of the lattice cell in the directions of the other two coordinate axes.

[0013] According to some embodiments of the present application, the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method further includes a first baffle and a second baffle;

[0014] Among the channel openings formed on the surface of the core body, the channel opening with the largest area in the central region and the channel openings separated from the channel opening with the largest area in the central region are one type of channel openings, namely, the low-temperature working medium channel opening and the high-temperature working medium channel opening, and the channel opening adjacent to the channel opening with the largest area in the central region is the other type of channel opening, namely, the low-temperature working medium channel opening and the high-temperature working medium channel opening;

[0015] The first baffle blocks the high-temperature working medium passage opening on the surface of the core in the first direction, leaving the low-temperature working medium passage opening on the surface of the core in the first direction open;

[0016] The second baffle blocks the low-temperature working medium passage opening on the surface of the core in the second direction, leaving the high-temperature working medium passage opening on the surface of the core in the second direction open.

[0017] According to some embodiments of the present application, the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method further includes:

[0018] a first end cap formed on the shell and disposed between the cryogenic medium inlet and the core, and between the core and the cryogenic medium outlet, so that an internal space of the first end cap forms a liquid collecting cavity;

[0019] The second head is formed on the shell and is arranged between the high-temperature working medium inlet and the core body, and between the core body and the high-temperature working medium outlet, so that the internal space of the second head forms a liquid collecting cavity.

[0020] According to some embodiments of the present application, the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method further includes:

[0021] The flange is used to securely connect the first and second end caps to the working fluid pipeline.

[0022] According to the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the side of the compressed Gyroid-type three-period minimal surface core relative to the working fluid inlet and the working fluid outlet is sealed with the inner wall of the shell with a contour edge, and the side of the compressed Gyroid-type three-period minimal surface core opposite to the bottom surface of the shell is sealed with the bottom surface.

[0023] According to the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the first direction and the second direction are perpendicular to each other.

[0024] Beneficial effects of the present invention:

[0025] In its first aspect, the present invention compresses a typical Gyroid TPMS structure to create a Gyroid-type three-periodic minimal surface primary surface heat exchanger based on this compression method. The Gyroid TPMS structure offers superior performance compared to many other TPMS configurations. This present invention optimizes this superior performance, significantly increasing the specific surface area of ​​the heat exchanger core and reducing the amplitude of the cross-sectional structure through the introduction of a compression method, thereby achieving drag reduction and efficiency improvement.

[0026] In the second aspect, the present invention can be used to solve the oil cooling problem in the petrochemical industry. Experimental data show that the heat exchanger of the present invention with a compressed Gyroid-type three-period minimal surface core reduces the spanwise pressure drop and improves the heat transfer capacity compared to the heat exchanger with a classic Gyroid-type three-period minimal surface core. This optimization significantly improves the heat transfer effect of the heat exchanger.

[0027] Thirdly, the primary surface heat exchanger A1 of the present invention, which compresses the core along the x-direction, with α=2, β=1, γ=1, and c=0.438, achieves the highest average pressure drop reduction ratio and the highest average heat transfer rate increase ratio for high-temperature working fluids. The improvements in average pressure drop reduction ratio and average heat transfer rate increase ratio are identical, achieving simultaneous improvements in pressure drop and heat transfer efficiency, resulting in optimal results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a cross-sectional structural diagram of the G-TPMS primary surface heat exchanger based on the compression method according to Example 1 of the present invention, with compression in the x-direction.

[0029] Figure 2 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 1 of the present invention, with compression in the x-direction.

[0030] Figure 3 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 2 of the present invention, compression in the y direction).

[0031] Figure 4 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 3 of the present invention (compression in the z direction).

[0032] Figure 5 This is a pressure drop data diagram of the heat exchanger with uncompressed and three-way compression cores using water as the working fluid. Among them, G_HEM represents the uncompressed G-TPMS core, G_x_HEM represents the G-TPMS compression core compressed in the x-axis direction, G_y_HEM represents the G-TPMS compression core compressed in the y-axis direction, and G_z_HEM represents the G-TPMS compression core compressed in the z-axis direction.

[0033] Figure 6 This is a graph of pressure drop data for heat exchangers with uncompressed and three-way compression cores using oil as the working fluid.

[0034] Figure 7 This is a data chart of the heat transfer of the heat exchanger with uncompressed and three-way compressed cores.

[0035] In the figure: 100. Shell, 101. Low-temperature working fluid inlet, 102. Low-temperature working fluid outlet, 103. High-temperature working fluid inlet, 104. High-temperature working fluid outlet, 105. First head, 106. Second head, 107. Flange, 1071. Bolt hole, 108. High-temperature working fluid domain, 109. Low-temperature working fluid domain, 200. Compressed Gyroid-type three-periodic minimal surface core, 201. Low-temperature working fluid channel, 202. High-temperature working fluid channel, 203. First baffle, 204. Second baffle. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present application with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0037] Terminology Notes:

[0038] A primary surface heat exchanger (PSR) is a heat exchanger in which low and high temperature working fluids transfer heat only through the partition (working fluid channel wall) that separates the low and high temperature working fluids.

[0039] Triple-periodic minimal surfaces (TPMS) are a class of porous structures with smooth, continuous curves and high specific surface area. Their geometry is defined by the average curvature of each point on the surface being zero. TPMS structures consist of interpenetrating, non-intersecting networks with a periodic and ordered topology in the three principal directions and symmetry in the crystal space group.

[0040] G-TPMS: Gyroid type three-cycle minimal surface primary surface heat exchanger.

[0041] The present invention is a solution to the oil cooling problem in the petrochemical industry. Of course, it is also applicable to other scenarios where the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method of the present invention can be used.

[0042] like Figure 1 As shown, a Gyroid-type three-period minimal surface primary surface heat exchanger A based on a compression method includes a shell 100, a compressed Gyroid-type three-period minimal surface core 200, and a baffle.

[0043] The shell 100 is formed with a low-temperature working fluid inlet 101 and a low-temperature working fluid outlet 102 arranged opposite to each other in a first direction, a high-temperature working fluid inlet 103 and a high-temperature working fluid outlet 104 arranged opposite to each other in a second direction, and an accommodating space. The first direction intersects with the second direction and is preferably arranged vertically, that is, the mainstream flow direction of the high-temperature working fluid and the mainstream flow direction of the low-temperature working fluid form a 90° angle.

[0044] The shell 100 defines an internal accommodation space, and a compressed Gyroid-shaped three-periodic minimal surface core 200 is positioned within the internal accommodation space, preferably in the center of the internal space. A head is formed on the shell 100 to guide the low- and high-temperature working fluids in and out of their respective areas. The heads are distinguished by their installation position and include a first head 105 and a second head 106.

[0045] like Figure 1 As shown, the side of the compressed Gyroid-type three-periodic minimal surface core 200 opposite to the working fluid inlet and working fluid outlet is sealed to the inner wall of the shell 100 with a contour edge. The side of the compressed Gyroid-type three-periodic minimal surface core 200 opposite to the bottom surface of the shell 100 is sealed to the bottom surface. The bottom surface can be understood as the two bottom surfaces of the shell 100, that is, two bottom surfaces arranged oppositely in the horizontal direction. It can be seen that the side of the compressed Gyroid-type three-periodic minimal surface core 200 opposite to the working fluid inlet and working fluid outlet is sealed to the inner wall of the shell 100 with a contour edge.

[0046] The first head 105 is arranged between the low-temperature working medium inlet 101 and the core body, and between the core body and the low-temperature working medium outlet 102. The core body is sealed with the inner wall of the shell 100 by its contour edge as described above, so that the internal space of the first head 105 forms a liquid collecting cavity and is sealed.

[0047] The second head 106 is arranged between the high-temperature working medium inlet 103 and the core body, and between the core body and the high-temperature working medium outlet 104. The core body is sealed with its contour edge and the inner wall of the shell 100 as described above, so that the internal space of the second head 106 forms a liquid collecting cavity and is sealed.

[0048] In a preferred embodiment, the head form in this embodiment adopts a gradually shrinking and expanding shape. One end of the head is connected to the contour edge of the compressed Gyroid-type three-period minimal surface core 200, and the other end is connected to the working fluid inlet and outlet through the flange 107. A cavity is formed between the core and the working fluid inlet, and between the core and the working fluid outlet to collect liquid. The liquid collecting cavity adopts a gradually shrinking and expanding shape. The specific change is that the inner diameter shape of the flange 107 is transformed from a circle to a quadrilateral corresponding to the surface of the core. The liquid collecting cavity is arranged at the inlet and outlet of the low and high temperature working fluids, and a length is reserved for the working fluid to fully develop. The inlet and outlet liquid collecting cavities are arranged at the working fluid inlet and outlet to ensure that the working fluid is fully developed before entering the core of the heat exchanger, eliminating the disadvantage of uneven flow distribution.

[0049] In the present invention, the first head 105 and the second head 106 are fixedly connected to the working fluid pipeline through the flange 107, which is used to connect the heat exchanger and the working fluid pipeline. In a preferred embodiment, the inner diameter of the flange 107 is the same as the inner diameter of the working fluid pipeline, and four bolt holes 1071 are respectively provided at the four equal parts of the flange 107 to provide installation positions for fastening bolts. The connecting flange 107 is combined with the liquid collecting chamber for the purpose of connecting the heat exchanger to the high and low temperature working fluid system. The thickness of the connecting flange 107 meets the strength requirements, the size of the connecting flange 107 matches the size of the flange 107 of the working fluid pipeline system, and the positioning bolt hole 1071 is provided on the connecting flange 107, and the position of the bolt hole 1071 matches the position of the bolt hole 1071 of the flange 107 of the working fluid pipeline system. The connecting flange 107 is an important component for connecting the heat exchanger to the working fluid pipeline system. The bolt connection is fastened through the bolt holes 1071, and a polytetrafluoroethylene gasket is used to ensure that the heat exchanger liquid does not leak.

[0050] In this embodiment, the compressed Gyroid-type three-periodic minimal surface is a compressed structure along a certain direction generated by controlling the coefficients in the expression on the basis of the Gyroid-type three-periodic minimal surface, and this direction can be any direction of the coordinate axes x, y, and z.

[0051] The compressed Gyroid-type three-periodic minimal surface core 200, hereinafter referred to as the G-TPMS compression core, serves as a primary surface separating the high-temperature and low-temperature working fluids. Heat from the high-temperature working fluid is transferred to the low-temperature working fluid through the G-TPMS compression core. The G-TPMS compression core serves as both a partition structure for separating the high-temperature and low-temperature working fluids and a heat conduction structure for heat exchange. The TPMS structure combines structural and performance integration.

[0052] The surface of the G-TPMS compression core is molded with a low-temperature working fluid channel opening and a high-temperature working fluid channel opening, and the interior is molded with a low-temperature working fluid channel 201 and a high-temperature working fluid channel 202, which are used to separate the low and high-temperature working fluid domains 108 and separate the working fluid channels inside the G-TPMS compression core. It should be understood that the working fluid channel is an internal channel of the structure generated based on the molding of the G-TPMS compression core, and is determined by the basic control equation of the core.

[0053] The baffles include a first baffle 203 and a second baffle 204. The central channel opening and the alternately spaced channel openings on either side of the central channel opening are the first channel openings; the adjacent channel openings on either side of the central channel opening and the alternately spaced channel openings on either side of the adjacent channel openings are the second channel openings. The first channel openings are either low-temperature or high-temperature, while the second channel openings are either low-temperature or high-temperature. The first baffle 203 blocks the high-temperature channel openings on the core surface in a first direction, leaving the low-temperature channel openings on the core surface open. The second baffle 204 blocks the low-temperature channel openings on the core surface in a second direction, leaving the high-temperature channel openings on the core surface open. The baffles are provided on the core surface to prevent low-temperature and high-temperature fluids from entering each other's flow channels at the fluid inlet and outlet. The baffle's edge overlaps with the channel's edge and has a certain thickness, preventing low- and high-temperature fluids from entering the other channel. That is, the baffle is positioned on the same plane as the edge of the G-TPMS compression core, and its outer contour matches the shape of the channel's inlet and outlet, ensuring that the inlet and outlet baffles can completely prevent foreign fluids from penetrating or crossing the interior.

[0054] Therefore, the baffles of the working fluid inlet and outlet are set at the inlet and outlet positions of the high-temperature working fluid and the low-temperature working fluid. As mentioned above, for each surface of the core, there are channel openings for the cold and high-temperature working fluids at the same time. The baffle coincides with the edge of the core surface, blocking one of the channel openings, so that only one channel opening of the cold and high-temperature working fluids can be open on the core surface in one direction, so that the corresponding working fluid can enter the corresponding working fluid channel.

[0055] It can be seen that the present invention blocks the different working fluid channel openings on the surface of the G-TPMS compression core in different directions with baffles, so that only one type of liquid is allowed to flow into the working fluid channel of the core in the corresponding direction in one direction. For example, the high-temperature working fluid channel opening on the surface of the G-TPMS compression core in the first direction is blocked by a baffle, and only low-temperature working fluid is allowed to pass through in this direction. The low-temperature working fluid channel on the surface of the G-TPMS compression core in the second direction is blocked by a baffle, and only high-temperature working fluid is allowed to pass through in this direction. The low and high-temperature working fluid areas of the heat exchanger in this embodiment are isolated by baffles and channels to avoid cross-flow of liquids. In this embodiment, the baffle at the high-temperature working fluid channel opening prevents the high-temperature working fluid from entering the working fluid channel of the low-temperature working fluid, and the baffle at the low-temperature working fluid channel opening prevents the low-temperature working fluid from entering the working fluid channel of the high-temperature working fluid, so as to ensure that the working fluids are not mixed.

[0056] In this embodiment, the G-TPMS compression core is compressed from the G-TPMS structure. The mathematical expression of the G-TPMS structure is:

[0057] sinXcosY+sinYcosZ+sinZcosX=c;

[0058] Where X=2απx, Y=2βπy, Z=2γπz, where α, β, and γ are compression coefficients used to control the size of the lattice cells in the x, y, and z directions. To control the structural compression in a single direction, it is necessary to change this directional coefficient while keeping the other two coefficients equal, so that this coefficient is greater than the other two coefficients. c is a constant used to control the porosity of the overall structure. When the minimal surface has no thickness, c=0.

[0059] In one embodiment, the value of the compression coefficient change should be an integer multiple of the constant value to control the structure to compress proportionally in the compression direction.

[0060] In one embodiment, the heat exchanger is 3D printed as a whole, and the heat exchanger is manufactured using the selective laser melting technology in the additive manufacturing method. To ensure the lightweight of the heat exchanger, AlSi10Mg is selected as the material of the whole machine.

[0061] As mentioned above, the G-TPMS compression core is an optimization based on the typical G-TPMS structure. It is the core structure of the TPMS heat exchanger. Its function is to separate the high-temperature working fluid from the low-temperature working fluid and transfer the heat of the high-temperature working fluid to the low-temperature working fluid. The heat exchange process achieved by its application is as follows:

[0062] The high-temperature working fluid is connected to the high-temperature working fluid system pipeline and the heat exchanger through the flange 107. After the high-temperature working fluid enters the second head 106 on the inlet side, it is fully collected. In the second direction, it enters the high-temperature working fluid channel 202 from the high-temperature working fluid channel port on the inlet side surface of the compressed Gyroid type three-period minimal surface core 200, and then flows in the high-temperature working fluid channel of the tortuous compressed Gyroid type three-period minimal surface core 200, and flows out from the high-temperature working fluid channel port on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200. After flowing out of the high-temperature working fluid channel port on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200, the high-temperature working fluid reaches the second head 106 on the outflow side, and flows into the high-temperature working fluid system after passing through the flange 107 connected to the second head 106.

[0063] The low-temperature working medium is connected to the low-temperature working medium system pipeline and the heat exchanger through the flange 107. After entering the first head 105 on the inlet side, the low-temperature working medium is fully collected. In the first direction, it enters the low-temperature working medium channel 201 from the low-temperature working medium channel port on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200 and the high-temperature working medium channel port on the inlet side. Then, it flows in the low-temperature working medium channel 201 of the tortuous compressed Gyroid type three-period minimal surface core 200 and flows out from the low-temperature working medium channel port on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200. After flowing out of the compressed Gyroid type three-period minimal surface core 200, the low-temperature working medium reaches the first head 105 on the outflow side, and flows into the low-temperature working medium system after passing through the flange 107 connected to the first head 105.

[0064] Example 1: Primary surface heat exchanger A1 has the structure of the primary surface heat exchanger A described above.

[0065] Among them, the basic control equation of the G-TPMS compression core is:

[0066] sinXcosY+sinYcosZ+sinZcosX=c;

[0067] Where, X = 2απx, Y = 2βπy, Z = 2γπz, where α = 2, β = 1, γ = 1, c = 0.438, compression in the x direction;

[0068] The low-temperature working fluid is water, controlled at 30°C, and the speed is controlled at 0.08-0.14 m / s. The high-temperature working fluid is high-temperature thermal oil, with the high-temperature working fluid inlet temperature controlled at 80°C and the speed controlled at 0.0275-0.06 m / s. The minimum wall thickness is 0.5 mm, and the core lengths in the x, y, and z directions are 60 mm, 50 mm, and 40 mm, respectively, for an overall dimension of 126 mm × 116 mm × 42 mm.

[0069] Example 2: Primary surface heat exchanger A2, having the structure of the above-mentioned primary surface heat exchanger A;

[0070] Among them, the basic control equation of the G-TPMS compression core is:

[0071] sinXcosY+sinYcosZ+sinZcosX=c;

[0072] Where, X = 2απx, Y = 2βπy, Z = 2γπz, where α = 1, β = 2, γ = 1, c = 0.438, compression in the y direction;

[0073] The low-temperature working fluid is water, controlled at 30°C, and the speed is controlled at 0.08-0.14 m / s. The high-temperature working fluid is high-temperature thermal oil, with the high-temperature working fluid inlet temperature controlled at 80°C and the speed controlled at 0.0275-0.06 m / s. The minimum wall thickness is 0.5 mm, and the core lengths in the x, y, and z directions are 60 mm, 50 mm, and 40 mm, respectively, for an overall dimension of 126 mm × 116 mm × 42 mm.

[0074] Example 3: Primary surface heat exchanger A3, having the structure of the above-mentioned primary surface heat exchanger A;

[0075] Among them, the basic control equation of the G-TPMS compression core is:

[0076] sinXcosY+sinYcosZ+sinZcosX=c;

[0077] Where, X = 2απx, Y = 2βπy, Z = 2γπz, where α = 1, β = 1, γ = 2, c = 0.438, compression in the z direction;

[0078] The low-temperature working fluid is water, controlled at 30°C, and the speed is controlled at 0.08-0.14 m / s. The high-temperature working fluid is high-temperature thermal oil, with the high-temperature working fluid inlet temperature controlled at 80°C and the speed controlled at 0.0275-0.06 m / s. The minimum wall thickness is 0.5 mm, and the core lengths in the x, y, and z directions are 60 mm, 50 mm, and 40 mm, respectively, for an overall dimension of 126 mm × 116 mm × 42 mm.

[0079] Comparative Example 1: Primary surface heat exchanger D1, which differs from the primary surface heat exchanger A in that it has an uncompressed, typical Gyroid-type three-period minimal surface core;

[0080] Among them, the basic control equation of the G-TPMS core is:

[0081] sinXcosY+sinYcosZ+sinZcosX=c;

[0082] In the formula, X=2απx, Y=2βπy, Z=2γπz, where α=1, β=1, γ=1, uncompressed;

[0083] The low-temperature working fluid is water, controlled at 30°C, and the speed is controlled at 0.08-0.14 m / s. The high-temperature working fluid is high-temperature thermal oil, with the high-temperature working fluid inlet temperature controlled at 80°C and the speed controlled at 0.0275-0.06 m / s. The minimum wall thickness is 0.5 mm, and the core lengths in the x, y, and z directions are 60 mm, 50 mm, and 40 mm, respectively, for an overall dimension of 126 mm × 116 mm × 42 mm.

[0084] Experimental description:

[0085] The pressure drop is closely related to the flow rate of the working fluid. An increase in the flow rate will lead to an increase in the pressure drop, but at the same time it will also increase the disturbance between the working fluid and the heat exchange surface, thereby improving the heat exchange efficiency.

[0086] The heat transfer rate of a heat exchanger refers to the amount of heat transferred from a high-temperature working medium to a low-temperature working medium. It is a key indicator of heat exchanger performance. Since the heat transfer rate of a heat exchanger is the amount of heat transferred from a high-temperature working medium to a low-temperature working medium, it is sufficient to calculate the heat transfer rate for only one working medium.

[0087] Table 1 shows the pressure drop simulation results of the heat exchange module of the Gyroid-type TPMS, the x-direction compression Gyroid-type TPMS, the y-direction compression Gyroid-type TPMS, and the z-direction compression Gyroid-type TPMS.

[0088] The pressure drop ratio of the current flow rate = (pressure drop of a certain compressed gyroid - pressure drop of the original gyroid / pressure drop of the original gyroid) × 100%.

[0089] Average pressure drop reduction ratio = sum of pressure drop reduction ratios of each flow rate condition / number of flow rate conditions.

[0090] Table 2 shows the heat transfer simulation results of the heat exchange modules of Gyroid-type TPMS, x-direction compression Gyroid-type TPMS, y-direction compression Gyroid-type TPMS, and z-direction compression Gyroid-type TPMS.

[0091] The heat transfer rate increase ratio of the current flow rate = (heat transfer rate of a certain compressed Gyroid - heat transfer rate of the original Gyroid / heat transfer rate of the original Gyroid) × 100%.

[0092] Average heat transfer rate increase ratio = sum of heat transfer rate increase ratios for each flow rate condition / number of flow rate conditions.

[0093]

[0094]

[0095] From Table 1-2, Figure 5-6 It can be seen that compared with the primary surface heat exchanger D1 of Comparative Example 1 without a compressed core:

[0096] The spanwise pressure drop of the primary surface heat exchanger A1 with the core compressed along the x direction has decreased. At the same speed, the average pressure drop of the low-temperature working fluid has decreased by 15.267%; the average pressure drop of the high-temperature working fluid has decreased by 265.713%.

[0097] The spanwise pressure drop of the primary surface heat exchanger A2 with the core compressed along the y direction decreased. The average pressure drop ratio of the low-temperature working fluid was 412.094%, and the average pressure drop ratio of the high-temperature working fluid was 25.657%.

[0098] The spanwise pressure drop of the primary surface heat exchanger A3 with the core compressed along the z direction decreased, with the average pressure drop ratio of the low-temperature working fluid being 16.621%; the average pressure drop ratio of the high-temperature working fluid being 16.613%.

[0099] Compared with the primary surface heat exchanger D1 of Comparative Example 1 without a compressed core:

[0100] The average increase in heat transfer rate of the primary surface heat exchanger A1 with the core compressed along the x direction is 52.964%.

[0101] The average increase in heat transfer rate of the primary surface heat exchanger A2 with the core compressed along the y direction is 26.227%.

[0102] The average increase in heat transfer rate of the primary surface heat exchanger A3 with the core compressed along the z direction is 29.278%.

[0103] Thus, compared to the primary surface heat exchanger D1 of Comparative Example 1, which had an uncompressed core, the primary surface heat exchanger A1, which had a core compressed along the x-direction, achieved the highest average pressure drop reduction ratio for high-temperature working fluids and the highest average heat transfer rate increase ratio. The improvements in average pressure drop reduction ratio and average heat transfer rate increase ratio were consistent.

[0104] The heat exchangers A1, A2, and A3, which compress the core along the x, y, and z directions, have different effects on the average pressure drop reduction ratio of the low-temperature working medium and the average increase ratio of the heat exchange rate. For example, the heat exchanger A2, which compresses the core along the y direction, has the highest average pressure drop reduction ratio of the low-temperature medium, but the average increase ratio of the heat exchange rate is in the middle.

[0105] The average pressure drop reduction ratio of high-temperature working fluid and the average increase ratio of heat exchange rate for heat exchangers A2 and A3 with the core compressed along the y and z directions are not identical. For example, the average pressure drop reduction ratio of high-temperature working fluid for heat exchanger A2 with the core compressed along the y direction is in the middle, but the average increase ratio of heat exchange rate is the lowest.

[0106] This shows that the primary surface heat exchanger A1 of the present invention, which compresses the core along the x-direction, with α=2, β=1, γ=1, and c=0.438, achieves the highest average pressure drop reduction ratio and the highest average heat transfer rate increase ratio for high-temperature working fluids. The improvements in the average pressure drop reduction ratio and the average heat transfer rate increase ratio are identical, achieving simultaneous improvements in pressure drop and heat transfer efficiency, resulting in the optimal effect.

[0107] The present invention discloses a Gyroid-type three-periodic minimal surface (G-TPMS) primary surface heat exchanger based on a compression method, which belongs to the technical field of heat exchangers. The heat exchanger is based on the G-TPMS structure and performs structural compression in the x, y, and z directions respectively.

[0108] Compared with the typical G-TPMS structure, under the same porosity, the G-TPMS compression structure can reduce the wall thickness and increase the specific surface area. From a cross-sectional perspective, it can also reduce the amplitude of the TPMS structure.

[0109] G-TPMS heat exchangers offer advantages over both TPMS-type and traditional heat exchangers. The G-TPMS primary surface heat exchanger based on the compression method is a further optimization of the G-TPMS primary surface heat exchanger. The simulation and experimental methods described above jointly reveal the performance improvement and underlying mechanism of the compression method for optimizing the G-TPMS heat exchanger.

[0110] The present invention explores the new situation of TPMS heat exchangers and provides technical support for solving the lightweight heat exchange needs in the petrochemical field. In the context of petrochemical oil cooling, the present invention can greatly increase the heat exchange area, reduce the spanwise pressure drop, and improve the overall heat exchange capacity, effectively ensuring drag reduction and efficiency improvement.

[0111] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0113] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0114] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0115] In the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0116] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0117] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A Gyroid type three-period minimal surface primary surface heat exchanger based on a compression method, characterized in that: include: A shell (100), the shell (100) being formed with a low-temperature working medium inlet (101) and a low-temperature working medium outlet (102) arranged opposite to each other in a first direction, a high-temperature working medium inlet (103) and a high-temperature working medium outlet (104) arranged opposite to each other in a second direction, and an accommodating space, wherein the first direction intersects with the second direction; A compressed Gyroid-type three-period minimal curved surface core (200) is arranged in the accommodating space and is formed by compression of the Gyroid-type three-period minimal curved surface core in any coordinate axis direction; a low-temperature working fluid channel opening and a high-temperature working fluid channel opening are formed on the surface of the compressed Gyroid-type three-period minimal curved surface core (200), and a low-temperature working fluid channel (201) and a high-temperature working fluid channel (202) are formed inside the core; The basic governing equation of the Gyroid-type three-periodic minimal surface core is: sinXcosY+sinYcosZ+sinZcosX=c In the formula, X=2απx, Y=2βπy, Z=2γπz, where, x , y and z It is the spatial rectangular coordinate system established in the lattice cell. x axis, y Axis and z The coordinates of the axes, α , β , γ It is used to control the x axis, y Axis and z is the coefficient for the size of the lattice cell in the axial direction, and c is a constant used to control the porosity of the overall structure; The compressed Gyroid-type three-period minimal surface core (200) is obtained by compressing the Gyroid-type three-period minimal surface core in a single coordinate axis direction, wherein the compression is to adjust the coefficient of the size of the lattice cell in the single coordinate axis direction to be greater than the coefficients of the size of the lattice cell in the other two coordinate axis directions, and the coefficients of the size of the lattice cell in the other two coordinate axis directions are equal; The compression direction is x In the axial direction, α=2, β=1, γ=1, c=0.438, the primary surface heat exchanger has the highest average pressure drop reduction ratio for high-temperature working fluids, and the highest average increase ratio for heat exchange. The average pressure drop reduction ratio and the average increase ratio for heat exchange for high-temperature working fluids have the same effect.

2. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to claim 1, characterized in that: The coefficient of the size of the lattice cell in the direction of the single coordinate axis is an integer multiple of the coefficients of the sizes of the lattice cells in the directions of the other two coordinate axes.

3. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: It also includes a first baffle (203) and a second baffle (204); Among the channel openings formed on the surface of the core body, the central channel opening and the channel openings arranged at intervals on both sides of the central channel opening are the first channel openings; The adjacent channel openings on both sides of the central channel opening, and the channel openings arranged at intervals on both sides of the adjacent channel openings are second channel openings; The first channel opening is a channel opening of one type among a low-temperature working medium channel opening and a high-temperature working medium channel opening, and the second channel opening is a channel opening of another type among a low-temperature working medium channel opening and a high-temperature working medium channel opening; The first baffle (203) blocks the high-temperature working medium channel opening on the core surface in the first direction, leaving the low-temperature working medium channel opening on the core surface in the first direction open; The second baffle (204) blocks the low-temperature working medium channel opening on the core surface in the second direction, leaving the high-temperature working medium channel opening on the core surface in the second direction open.

4. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: Also includes: A first end cap (105) is formed on the shell (100), and is arranged between the cryogenic medium inlet (101) and the core body, and between the core body and the cryogenic medium outlet (102), so that the internal space of the first end cap (105) forms a liquid collecting cavity; The second end cap (106) is formed on the shell (100), and is arranged between the high-temperature working medium inlet (103) and the core body, and between the core body and the high-temperature working medium outlet (104), so that the internal space of the second end cap (106) forms a liquid collecting cavity.

5. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to claim 4, characterized in that: Also includes: The flange (107) is used to fixedly connect the first end cap (105), the second end cap (106) and the working fluid pipeline.

6. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: The side of the compressed Gyroid-type three-period minimal surface core (200) opposite to the working fluid inlet and the working fluid outlet is sealed to the inner wall of the shell (100) with a contour edge, and the side of the compressed Gyroid-type three-period minimal surface core (200) opposite to the bottom surface of the shell (100) is sealed to the bottom surface.

7. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: The first direction and the second direction are perpendicular to each other.

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