Phase change heat storage device for strengthening fluid heat transfer

Abstract

The invention discloses a phase change heat storage device for strengthening fluid heat transfer, which comprises a rectangular box body, an upper layer partition plate, a lower layer partition plate, a first fin, a second fin and a flange, the upper layer partition plate and the lower layer partition plate are horizontally arranged in the rectangular box body, and the rectangular box body is divided into an upper layer, a middle layer and a lower layer. The phase-change heat storage device has the beneficial effects that heat transfer between cold and hot fluid and the phase-change heat storage material can be enhanced, strong disturbance can be formed between the fluid and the heat exchange surface through the heat transfer structure of the device, efficient heat transfer is achieved on the limited heat transfer area, the structural size of the heat storage device can be effectively reduced, and the heat transfer efficiency is improved. The heat storage efficiency and the heat release efficiency of the heat storage device are improved, production and utilization of heat energy get rid of limitation in the aspects of space, time and strength, and therefore efficient utilization of clean energy or industrial waste heat can be promoted.

Description

Technical Field

[0001] The invention relates to a heat storage device, in particular to a phase change heat storage device for enhancing fluid heat transfer. Background Art

[0002] At present, efficient energy utilization and storage is one of the main measures to solve the global energy crisis. Thermal storage devices can effectively solve the problems of intensity, time and space mismatch in the production, storage and use of thermal energy. Among them, phase change thermal storage devices use phase change materials as their thermal storage carriers, which have high energy storage density, stable thermal storage temperature and cycle performance. However, the heat transfer between the heat exchange fluid and the heat storage phase change material in the phase change thermal storage device is often poor, which seriously limits the storage and release of thermal energy in the thermal storage device. Through the development of passive enhanced heat transfer structures, the heat transfer capacity between the heat exchange fluid and the phase change thermal storage material is enhanced, and a phase change thermal storage device with enhanced fluid heat transfer is invented, which has practical significance for improving the efficient utilization of thermal energy. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of poor heat transfer between heat exchange fluid and heat storage material in a phase change heat storage device and to provide a phase change heat storage device for enhancing fluid heat transfer.

[0004] The enhanced fluid heat transfer device filled with phase change material provided by the present invention comprises a rectangular box, an upper baffle, a lower baffle, a first rib, a second rib, and a flange. The upper baffle and the lower baffle are horizontally arranged inside the rectangular box to divide the rectangular box into an upper layer, a middle layer, and a lower layer.

[0005] The first rib and the second rib are both of right-angled trapezoidal structure, and the upper obtuse angle of the rib is 124°, and the lower acute angle is 56°, wherein the first rib has a rectangular hole, and a rectangular baffle is provided on the rectangular hole, and the angle formed by the rectangular baffle and the first rib is 165°, and there is no hole structure on the second rib, and the first ribs and the second ribs are arranged in a horizontal row, and two rows form a group along the forward direction of the fluid, wherein the first ribs are in the front row and the second ribs are in the back row, and the back row fins of each group are located behind the middle position of the front row fins.

[0006] The lower baffle intersects the first ribs and the second ribs arranged in groups vertically, wherein the upper sides of the first ribs and the second ribs are short and the lower sides are long, and they are placed in an upright trapezoid, and the angle between the first ribs and the second ribs and the forward direction of the fluid is 30°. The lower baffle divides the first ribs and the second ribs into two parts, an upper part and a lower part, and the height ratio thereof is 1:2, wherein a rectangular hole and a rectangular baffle are provided in the middle part of the upper part of the first rib, and a certain height gap is left between the upper sides of the first ribs and the second ribs and the upper baffle, and the lower sides of the first ribs and the second ribs are in contact with the bottom of the rectangular box, and the first ribs and the second ribs arranged in groups are installed on the lower baffle, and the angles between the adjacent groups of first ribs and the forward direction of the flow are symmetrical to each other.

[0007] The upper baffle intersects the first ribs and the second ribs arranged in groups vertically, wherein the upper sides of the first ribs and the second ribs are long and the lower sides are short, and they are placed in an inverted trapezoid, and the angle between the first ribs and the second ribs and the forward direction of the fluid is 30°. The upper baffle divides the first ribs and the second ribs into two parts, an upper part and a lower part, wherein the height ratio is 2:1, a rectangular hole and a rectangular baffle are provided in the middle part of the lower part of the first rib, a certain height gap is left between the lower sides of the first ribs and the second ribs and the lower baffle, and the upper sides of the first ribs and the second ribs are in contact with the top of the rectangular box, and the first ribs and the second ribs arranged in groups are installed on the upper baffle, and the angles between the adjacent groups of the first ribs and the forward direction of the flow are symmetrical to each other, and the first ribs and the second ribs installed on the upper baffle are staggered with the first ribs and the second ribs on the lower baffle.

[0008] The upper partition and the lower partition both extend out of the rectangular box body by a certain length in front and back and enclose a rectangular square opening shape, and a flange is arranged on the rectangular square opening.

[0009] The upper and lower structural spaces in the rectangular box are filled with phase change materials, and the middle layer is a flow space for fluid that releases or absorbs heat.

[0010] The rectangular box is made of stainless steel, the upper partition and the lower partition are made of stainless steel, the first rib and the second rib are made of high thermal conductivity metal material, the outer layer of the rectangular box is provided with an insulation layer, the insulation layer is filled with insulation material, the phase change material is a graphene microcapsule filled with paraffin, and the phase change temperature of the paraffin is the average temperature of the exothermic fluid and the endothermic fluid.

[0011] Working principle of the present invention:

[0012] The working principle of the phase change heat storage device for enhancing fluid heat transfer provided by the present invention is as follows:

[0013] Thermal storage working condition: A given high-temperature fluid flows in from the inlet of the middle layer, passes through the middle layer at a certain speed and washes the surfaces of the first and second fins arranged in groups in the middle layer. When the high-temperature fluid contacts the first fin in the first group of fins, since the forward direction of the fluid forms a 30° angle with the first fin, the fluid will contact the surface of the first fin in turn. Since the first fin is provided with holes and rectangular baffles, the fluid that washes the first fin is divided into three parts, one of which impacts the windward surface of the first fin at a high speed. The fluid that first contacts the surface of the first fin is blocked by the surface of the first fin, and the static pressure increases and the speed decreases. The fluid will flow to the area with low pressure. Macroscopically, the fluid will form a vortex on the surface of the first fin. The vortex will intensify the disturbance of the fluid in the fluid boundary layer on the surface of the first fin, thereby intensifying the convective heat transfer between the fluid and the first fin. A part of the fluid will impact the rectangular baffle at high speed. The angle between the rectangular baffle and the first fin is 165°. The fluid flushed onto the rectangular baffle will change the direction of the fluid under the influence of its guiding effect and then impact the leeward side of the next row of second fins. Due to the different contact time with the second fin, a vortex will also be formed on the leeward side of the second fin, thereby intensifying the convective heat transfer on the leeward side of the second fin. Another part of the fluid passes through the rectangular holes on the first fin and guides part of the fluid in the mainstream area to impact the windward surface of the next row of second fins at high speed. Since the second fin and the fluid form a 30° angle, a vortex will also be formed on the surface of the second fin, thereby disturbing the boundary layer of the fluid on the surface of the second fin, thereby strengthening the convective heat transfer between the second fin and the fluid. Since the first group of fins is still at a certain height from the upper partition, the fluid in this space will impact the second group of fins at high speed. Since the second group of fins and the first group of fins are inverted with each other, the enhanced heat transfer form of the second group of fins and the fluid is the same as that of the first group of fins. In this way, the high-temperature fluid and the fin group arranged in the middle channel are disturbed up and down and perform high-speed heat transfer. The first rib and the second rib are heated after obtaining the heat transferred by the fluid. Since the first rib and the second rib are made of high thermal conductivity materials, the first rib and the second rib placed in the upper space and the lower space will also be heated. Since the upper space and the lower space are filled with graphene microcapsules with high thermal conductivity and an internal paraffin shell, the microcapsules with graphene shells in contact with the first rib and the second rib will transfer heat with low thermal resistance, and the microcapsules in close contact will also transfer heat with low thermal resistance. The heated microcapsule shell will quickly transfer the heat to the paraffin inside the microcapsule, and the paraffin absorbs the heat and changes from solid to liquid, completing the phase change heat storage process.

[0014] Heat release conditions: a low-temperature fluid of a given temperature flows in from the inlet of the middle layer, passes through the middle layer at a certain speed and washes the surfaces of the first and second fins arranged in groups in the middle layer. When the low-temperature fluid contacts the first fin in the first group of fins, since the forward direction of the fluid forms an angle of 30° with the first fin, the low-temperature fluid will contact the surface of the first fin successively. Since a rectangular baffle is provided on the first fin, the fluid that washes the fluid to the first fin is divided into three parts, one part of which impacts the windward surface of the first fin at a high speed. The fluid that first contacts the surface of the first fin is blocked by the surface of the first fin, the static pressure increases, and the speed decreases. This part of the fluid will flow to the area with low pressure. Macroscopically, the fluid will form a vortex on the surface of the first fin. The vortex will intensify the disturbance of the fluid in the fluid boundary layer on the surface of the first fin, thereby intensifying the convective heat transfer between the fluid and the first fin. Part of the fluid impacts the rectangular baffle at high speed, and the angle between the rectangular baffle and the first fin is 165°. Under the influence of the flow guidance effect, the fluid flushing onto the rectangular baffle will change the forward direction of the fluid and then impact the leeward side of the next row of second fins. Due to the different contact time with the second fins, a vortex will also be formed on the leeward side of the second fin, thereby enhancing the convective heat transfer on the leeward side of the second fin. Another part of the fluid passes through the rectangular holes on the first fin and guides part of the fluid in the mainstream area to impact the windward surface of the next row of second fins at high speed. Since the second fin and the fluid form a 30° angle, a vortex will also be formed on the surface of the second fin, thereby disturbing the boundary layer of the fluid on the surface of the second fin, thereby strengthening the convective heat transfer between the second fin and the fluid. Since the first group of fins is still at a certain height from the upper partition, the fluid in this space will impact the second group of fins at high speed. Since the second group of fins and the first group of fins are inverted with each other, the enhanced heat transfer form of the second group of fins and the fluid is the same as that of the first group of fins. In this way, the low-temperature fluid and the fin group arranged in the middle channel are disturbed up and down and perform high-speed heat transfer. The first fin and the second fin are cooled after obtaining the cold transferred by the fluid. Since the first fin and the second fin are made of high thermal conductivity materials, the first fin and the second fin placed in the upper space and the lower space will also be cooled. Since the upper space and the lower space are filled with graphene microcapsules with high thermal conductivity and the shell of the internal paraffin is a phase change material, the microcapsules with graphene shells in contact with the first fin and the second fin will transfer cold with low thermal resistance, and the microcapsules in close contact will also transfer cold with low thermal resistance. The shell of the microcapsule after cooling will quickly transfer the cold to the paraffin inside the microcapsule, and the paraffin absorbs the cold and transforms from liquid to solid, completing the phase change heat release process.

[0015] The outer layer of the rectangular box is encapsulated and wrapped with heat-insulating materials, and the heat dissipation loss of the heat storage device can be effectively reduced through the heat-insulating shell.

[0016] Beneficial effects of the present invention:

[0017] The present invention provides a phase change heat storage device capable of enhancing heat transfer between cold and hot fluids and phase change heat storage materials. The heat transfer structure of the device can form strong disturbance between the fluid and the heat exchange surface, and efficiently transfer heat on a limited heat transfer area. It can effectively reduce the structural size of the heat storage device, improve the heat storage and heat release efficiency of the heat storage device, and free the production and utilization of thermal energy from the limitations of space, time and intensity, thereby promoting the efficient utilization of clean energy or industrial waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the heat storage device described in the present invention.

[0019] Figure 2 This is a front view of the overall structure of the heat storage device described in the present invention.

[0020] Figure 3 It is a top view of the overall structure of the heat storage device described in the present invention.

[0021] Figure 4 It is a top view of the upper section of the heat storage device box described in the present invention.

[0022] Figure 5 It is a top view of the cross section of the middle layer of the heat storage device box described in the present invention.

[0023] Figure 6 It is a top view of the lower section of the heat storage device box described in the present invention.

[0024] Figure 7 It is a schematic longitudinal section diagram of the heat storage device described in the present invention.

[0025] Figure 8 Schematic diagram of the first fin structure of the present invention

[0026] Fig. 9 This is a schematic diagram of the second fin structure of the present invention.

[0027] The annotations in the above figure are as follows:

[0028] 1. Rectangular box 2. Lower partition 3. Upper partition 4. First rib

[0029] 5. Second rib 6. Flange 7. Phase change material 8. Heat insulation material DETAILED DESCRIPTION

[0030] See also Figures 1 to 6 As shown:

[0031] The enhanced fluid heat transfer device filled with phase change material provided by the present invention comprises a rectangular box 1, a lower baffle 2, an upper baffle 3, a first rib 4, a second rib 5, and a flange 6. The lower baffle 2 and the upper baffle 3 are horizontally arranged inside the rectangular box 1, dividing the rectangular box 1 into an upper layer, a middle layer, and a lower layer.

[0032] The first rib 4 and the second rib 5 are both right-angled trapezoidal structures, and the upper obtuse angle of the rib is 124°, and the lower acute angle is 56°, wherein the first rib 4 has a rectangular hole, and a rectangular baffle is provided on the rectangular hole, and the angle formed by the rectangular baffle and the first rib 4 is 165°, and the second rib 5 has no hole structure, and the first rib 4 and the second rib 5 are arranged in a number of horizontal rows, and two rows form a group along the forward direction of the fluid, wherein the first rib 4 is in the front row and the second rib 5 is in the back row, and the second rib 5 in the back row of each group is located behind the middle position of the first rib 4 in the front row.

[0033] The lower baffle plate 2 intersects perpendicularly with the first ribs 4 and the second ribs 5 arranged in groups, wherein the upper sides of the first ribs 4 and the second ribs 5 are short and the lower sides are long, and they are placed in an upright trapezoid. The angle between the first ribs 4 and the second ribs 5 and the forward direction of the fluid is 30°. The lower baffle plate 2 divides the first ribs 4 and the second ribs 5 into two parts, an upper part and a lower part, and the height ratio thereof is 1:2. A rectangular hole and a rectangular baffle are provided in the middle part of the upper part of the first rib 4. A certain height gap is left between the upper sides of the first ribs 4 and the second ribs 5 and the upper baffle plate, and the lower sides of the first ribs 4 and the second ribs 5 are in contact with the bottom of the rectangular box 1. The first ribs 4 and the second ribs 5 arranged in groups are installed on the lower baffle plate 2, and the angles between adjacent groups of first ribs 4 and second ribs 5 and the forward direction of the flow are symmetrical to each other.

[0034] The upper baffle plate 3 intersects perpendicularly with the first ribs 4 and the second ribs 5 arranged in groups, wherein the upper sides of the first ribs 4 and the second ribs 5 are long and the lower sides are short, and they are placed in an inverted trapezoid. The angle between the first ribs 4 and the second ribs 5 and the forward direction of the fluid is 30°. The upper baffle plate 3 divides the first ribs 4 and the second ribs 5 into two parts, an upper part and a lower part, wherein the height ratio is 2:1. A rectangular hole and a rectangular baffle are provided in the middle part of the lower part of the first rib 4. A certain height gap is left between the lower sides of the first ribs 4 and the second ribs 5 and the lower baffle plate 2. The upper sides of the first ribs 4 and the second ribs 5 are in contact with the top of the rectangular box 1. The first ribs 4 and the second ribs 5 arranged in groups are installed on the upper baffle plate 3. The angles between the adjacent groups of the first ribs 4 and the forward direction of the flow are symmetrical to each other. The first ribs 4 and the second ribs 5 installed on the upper baffle plate 3 are staggered with the first ribs 4 and the second ribs 5 on the lower baffle plate 2.

[0035] The lower partition plate 2 and the upper partition plate 3 both extend out of the rectangular box body 1 by a certain length in front and back and enclose a rectangular square opening shape, and a flange 6 is provided on the rectangular square opening.

[0036] The upper and lower structural spaces in the rectangular box 1 are filled with phase change material 7, and the middle layer is a flow space for fluid that releases or absorbs heat.

[0037] The rectangular box body 1 is made of stainless steel, the lower partition 2 and the upper partition 3 are made of stainless steel, the first rib 4 and the second rib 5 are made of high thermal conductivity metal material, the outer layer of the rectangular box body 1 is provided with a thermal insulation layer, the thermal insulation layer is filled with thermal insulation material 8, the phase change material 7 is a graphene microcapsule filled with paraffin, and the phase change temperature of the paraffin is the average temperature of the exothermic fluid and the endothermic fluid.

[0038] Working principle of the present invention:

[0039] The working principle of the phase change heat storage device for enhancing fluid heat transfer provided by the present invention is as follows:

[0040] Thermal storage working condition: A given high-temperature fluid flows in from the inlet of the middle layer, passes through the middle layer at a certain speed and washes the surfaces of the first fins 4 and the second fins 5 arranged in groups in the middle layer. When the high-temperature fluid contacts the first fin 4 in the first group of fins, since the forward direction of the fluid forms a 30° angle with the first fin 4, the fluid will contact the surface of the first fin 4 successively. Since the first fin 4 is provided with holes and rectangular baffles, the fluid washed to the first fin 4 is divided into three parts, one part of which impacts the windward surface of the first fin 4 at high speed. The fluid that first contacts the surface of the first fin 4 is blocked by the surface of the first fin 4, and the static pressure increases and the speed decreases. The divided fluid will flow to the area with low pressure. Macroscopically, the fluid will form a vortex on the surface of the first fin 4. The vortex will intensify the disturbance of the fluid in the fluid boundary layer on the surface of the first fin 4, thereby intensifying the convective heat transfer between the fluid and the first fin 4. A part of the fluid will impact the rectangular baffle at high speed. The angle between the rectangular baffle and the first fin 4 is 165°. The fluid flushed onto the rectangular baffle will change the forward direction of the fluid under the influence of its guiding effect and then impact the leeward side of the next row of second fins 5. Due to the different contact time with the second fin 5, a vortex will also be formed on the leeward side of the second fin 5, thereby intensifying the convective heat transfer on the leeward side of the second fin 5. Another part of the fluid passes through the rectangular holes on the first fin 4 and guides part of the fluid in the mainstream area to impact the windward surface of the next row of second fins 5 at high speed. Since the second fin 5 and the fluid form an angle of 30°, a vortex will also be formed on the surface of the second fin 5, thereby disturbing the boundary layer of the fluid on the surface of the second fin 5, thereby strengthening the convective heat transfer between the second fin 5 and the fluid. Since the first group of fins 4 and the upper partition 3 are still at a certain height, the fluid in this space will impact the second group of fins 5 at high speed. Since the second group of fins and the first group of fins are inverted with each other, the enhanced heat transfer form of the second group of fins and the fluid is the same as that of the first group of fins. In this way, the high-temperature fluid and the fin group arranged in the middle channel are disturbed up and down and perform high-speed heat transfer. The first rib 4 and the second rib 5 are heated after obtaining the heat transferred by the fluid. Since the first rib 4 and the second rib 5 are made of high thermal conductivity materials, the first rib 4 and the second rib 5 placed in the upper space and the lower space will also be heated. Since the upper space and the lower space are filled with graphene microcapsule phase change material 7 with high thermal conductivity and internal paraffin shell, the microcapsules with graphene shells in contact with the first rib 4 and the second rib 5 will transfer heat with low thermal resistance, and the microcapsules in close contact will also transfer heat with low thermal resistance. The heated microcapsule shell will quickly transfer the heat to the paraffin inside the microcapsule, and the paraffin absorbs the heat and changes from solid to liquid, completing the phase change heat storage process.

[0041] Heat release conditions: a low-temperature fluid of a given temperature flows in from the inlet of the middle layer, passes through the middle layer at a certain speed and washes the surfaces of the first fins 4 and the second fins 5 arranged in groups in the middle layer. When the low-temperature fluid contacts the first fin 4 in the first group of fins, since the forward direction of the fluid forms an angle of 30° with the first fin 4, the low-temperature fluid will contact the surface of the first fin 4 successively. Since a rectangular baffle is provided on the first fin 4, the fluid that washes the fluid to the first fin 4 is divided into three parts, one part of which impacts the windward surface of the first fin 4 at a high speed. The fluid that first contacts the surface of the first fin 4 is blocked by the surface of the first fin 4, the static pressure increases, and the speed decreases. This part of the fluid will flow to the area with low pressure. Macroscopically, the fluid will form a vortex on the surface of the first fin 4. The vortex will intensify the disturbance of the fluid in the fluid boundary layer on the surface of the first fin 4, thereby intensifying the convective heat transfer between the fluid and the first fin 4. A part of the fluid impacts the rectangular baffle at high speed, and the angle between the rectangular baffle and the first fin 4 is 165°. Under the influence of the flow guidance effect, the fluid flushing onto the rectangular baffle will change the forward direction of the fluid and then impact the leeward side of the next row of second fins 5. Due to the different contact time with the second fins 5, a vortex will also be formed on the leeward side of the second fin 5, thereby enhancing the convective heat transfer on the leeward side of the second fin 5. Another part of the fluid passes through the rectangular holes on the first fin 4 and guides part of the fluid in the mainstream area to impact the windward surface of the next row of second fins 5 at high speed. Since the second fin 5 and the fluid form an angle of 30°, a vortex will also be formed on the surface of the second fin 5, thereby disturbing the boundary layer of the fluid on the surface of the second fin 5, thereby strengthening the convective heat transfer between the second fin 5 and the fluid. Since the first group of fins and the upper partition 3 are still at a certain height, the fluid in this space will impact the second group of fins at high speed. Since the second group of fins and the first group of fins are inverted with each other, the enhanced heat transfer form of the second group of fins and the fluid is the same as that of the first group of fins. In this way, the low-temperature fluid and the fin group arranged in the middle channel are disturbed up and down and perform high-speed heat transfer. The first fin 4 and the second fin 5 are cooled after obtaining the cold transferred by the fluid. Since the first fin 4 and the second fin 5 are made of high thermal conductivity materials, the first fin 4 and the second fin 5 placed in the upper space and the lower space will also be cooled. Since the upper space and the lower space are filled with graphene microcapsule phase change material 7 with high thermal conductivity and internal paraffin shell, the microcapsules with graphene shells in contact with the first fin 4 and the second fin 5 will transfer cold with low thermal resistance, and the microcapsules in close contact will also transfer cold with low thermal resistance. The shell of the microcapsule after cooling will quickly transfer the cold to the paraffin inside the microcapsule, and the paraffin absorbs the cold and transforms from liquid to solid, completing the phase change heat release process.

[0042] The outer layer of the rectangular box 1 is packaged and wrapped with a heat insulating material 8, and the heat dissipation loss of the heat storage device can be effectively reduced through the heat insulating shell.

[0043] Beneficial effects of the present invention:

[0004] The present invention provides a phase change heat storage device capable of enhancing heat transfer between cold and hot fluids and phase change heat storage materials. The heat transfer structure of the device can form strong disturbances between the fluid and the heat exchange surface, can ensure efficient heat transfer on a limited heat transfer area, can effectively reduce the structural size of the heat storage device, and improve the heat storage and heat release efficiency of the heat storage device, so that the production and utilization of thermal energy are freed from the limitations of space, time and intensity, thereby promoting the efficient utilization of clean energy or industrial waste heat.

Claims

1. A phase change heat storage device for enhancing fluid heat transfer, characterized in that: The utility model comprises a rectangular box body, an upper partition plate, a lower partition plate, a first rib plate, a second rib plate and a flange, wherein the upper partition plate and the lower partition plate are horizontally arranged inside the rectangular box body, and the rectangular box body is divided into an upper layer, a middle layer and a lower layer.

2. A phase change heat storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The first rib and the second rib are both of right-angled trapezoidal structure, and the upper obtuse angle of the rib is 124°, and the lower acute angle is 56°, wherein the first rib has a rectangular hole, and a rectangular baffle is provided on the rectangular hole, and the angle formed by the rectangular baffle and the first rib is 165°, and there is no hole structure on the second rib, and the first ribs and the second ribs are arranged in a horizontal row, and two rows form a group along the forward direction of the fluid, wherein the first ribs are in the front row and the second ribs are in the back row, and the back row fins of each group are located behind the middle position of the front row fins.

3. A phase change heat storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The lower baffle intersects the first ribs and the second ribs arranged in groups vertically, wherein the upper sides of the first ribs and the second ribs are short and the lower sides are long, and they are placed in an upright trapezoid, and the angle between the first ribs and the second ribs and the forward direction of the fluid is 30°. The lower baffle divides the first ribs and the second ribs into two parts, an upper part and a lower part, and the height ratio thereof is 1:2, wherein a rectangular hole and a rectangular baffle are provided in the middle part of the upper part of the first rib, and a certain height gap is left between the upper sides of the first ribs and the second ribs and the upper baffle, and the lower sides of the first ribs and the second ribs are in contact with the bottom of the rectangular box, and the first ribs and the second ribs arranged in groups are installed on the lower baffle, and the angles between the adjacent groups of first ribs and the forward direction of the flow are symmetrical to each other.

4. A phase change heat storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The upper baffle intersects the first ribs and the second ribs arranged in groups vertically, wherein the upper sides of the first ribs and the second ribs are long and the lower sides are short, and they are placed in an inverted trapezoid, and the angle between the first ribs and the second ribs and the forward direction of the fluid is 30°. The upper baffle divides the first ribs and the second ribs into two parts, an upper part and a lower part, wherein the height ratio is 2:1, a rectangular hole and a rectangular baffle are provided in the middle part of the lower part of the first rib, a certain height gap is left between the lower sides of the first ribs and the second ribs and the lower baffle, and the upper sides of the first ribs and the second ribs are in contact with the top of the rectangular box, and the first ribs and the second ribs arranged in groups are installed on the upper baffle, and the angles between the adjacent groups of the first ribs and the forward direction of the flow are symmetrical to each other, and the first ribs and the second ribs installed on the upper baffle are staggered with the first ribs and the second ribs on the lower baffle.

5. A phase change thermal storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The upper partition and the lower partition both extend out of the rectangular box body by a certain length in front and back and enclose a rectangular square opening shape, and a flange is arranged on the rectangular square opening.

6. A phase change heat storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The upper and lower structural spaces in the rectangular box are filled with phase change materials, and the middle layer is a flow space for fluid that releases or absorbs heat.

7. A phase change thermal storage device for enhancing fluid heat transfer according to claim 1, characterized in that: The rectangular box is made of stainless steel, the upper partition and the lower partition are made of stainless steel, the first rib and the second rib are made of high thermal conductivity metal material, the outer layer of the rectangular box is provided with an insulation layer, the insulation layer is filled with insulation material, the phase change material is a graphene microcapsule filled with paraffin, and the phase change temperature of the paraffin is the average temperature of the exothermic fluid and the endothermic fluid.

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