Novel phase change heat storage cavity structure with heat pipes arranged in crossed mode

Abstract

The utility model discloses a novel phase change heat storage cavity structure with crosswise arranged heat pipes, which belongs to the technical field of heat storage and comprises a box body, heat exchange pipes and heat pipes, a working cavity used for containing phase change materials is arranged in the box body, the heat exchange pipes and the heat pipes are arranged in the working cavity, and the heat exchange pipes and the heat pipes are arranged in the working cavity. The heat pipe comprises a first pipe section, a second pipe section corresponding to the first pipe section and a third pipe section connected between the first pipe section and the second pipe section, the first pipe section is located on one side of the heat exchange pipe, and the second pipe section is located on the other side of the heat exchange pipe. The heat exchange area can be increased, the heat conduction efficiency is improved, the uniformity of the internal temperature of the phase change material is improved, and the heat exchange performance is improved; the heat exchange area with the phase-change materials is large, the phase-change materials in all positions in the working cavity are provided with near heat exchange positions, and the heat exchange efficiency of the whole heat storage cavity is high; the problem of uneven temperature distribution in the melting or solidification process of the phase change material is effectively solved, and the phase change rate is further increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat storage, and in particular relates to a novel phase-change heat storage cavity structure with cross-arranged heat pipes. Background Art

[0002] In order to solve the increasingly serious energy crisis and environmental pollution, it is necessary to explore new energy storage methods to reduce the dissipation of energy during storage and transportation. Developing new heat exchange equipment to improve energy utilization efficiency can also alleviate the problem of energy shortage. Phase change energy storage is a high-efficiency energy storage technology that relies on the latent heat of phase change materials (PCM) during phase transformation to achieve heat release and storage. This technology can achieve energy conversion under constant temperature conditions and has the advantages of high energy storage density, good stability, easy control and environmental protection. It is considered to be one of the most effective heat transfer mechanisms and is currently widely used in thermal management or thermal energy storage applications, including building insulation, battery thermal management, heat exchangers and solar energy technology.

[0003] At present, the phase change thermal storage chamber is an important phase change energy storage device. The outer wall of the chamber is provided with insulation materials to maintain the internal constant temperature environment, and relies on the internal PCM to store energy. Traditional PCM has low thermal conductivity and slow phase change rate. Especially when the liquid phase PCM condenses into a solid phase, the PCM near the cold end solidifies first, which results in the heat in the liquid phase area can only rely on the solid phase PCM for conduction. The temperature of the solid phase area near the cold end continues to decrease, while the condensation rate of the PCM in the liquid phase area is very slow, and the phase change thermal storage chamber has low thermal efficiency. A new solution needs to be proposed to improve the temperature uniformity of the PCM inside the phase change thermal storage chamber to accelerate the phase change rate of the PCM and improve the heat exchange efficiency of the thermal storage chamber. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a new phase change heat storage chamber structure with cross-arranged heat pipes to improve the temperature uniformity of the phase change material inside the phase change heat storage chamber.

[0005] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] A novel phase-change heat storage chamber structure with cross-arranged heat pipes comprises a box, a heat exchange tube and a heat pipe, wherein the box is provided with a working chamber for accommodating a phase-change material, the heat exchange tube and the heat pipe are arranged in the working chamber, the heat pipe comprises a first pipe section, a second pipe section corresponding to the first pipe section and a third pipe section connected between the first pipe section and the second pipe section, the first pipe section is located on one side of the heat exchange tube, and the second pipe section is located on the other side of the heat exchange tube.

[0007] Preferably, two heat pipes arranged vertically form a working group, and two heat pipes in each working group are arranged crosswise.

[0008] Preferably, the heat exchange tube includes a fourth pipe segment, a fifth pipe segment corresponding to the fourth pipe segment, and a sixth pipe segment connected between the fourth pipe segment and the fifth pipe segment, one side of the fourth pipe segment and the fifth pipe segment is a first side, the other side of the fourth pipe segment and the fifth pipe segment is a second side, the first pipe segment is located on the first side, and the second pipe segment is located on the second side.

[0009] Preferably, the heat exchange tube is a U-shaped tube, the fourth tube segment and the fifth tube segment are straight tubes, the sixth tube segment is an arc tube, the fourth tube segment corresponds to the inner wall position on one side of the box body, and the fifth tube segment corresponds to the inner wall position on the other side of the box body.

[0010] Preferably, a plurality of the heat exchange tubes are arranged side by side in the working chamber.

[0011] Preferably, the fourth pipe segment and the fifth pipe segment are perpendicular to the direction in which the plurality of heat exchange tubes are arranged side by side.

[0012] Preferably, the third pipe segment is located between the fourth pipe segment and the fifth pipe segment.

[0013] Preferably, the top of the box body is provided with a first limiting hole corresponding to the heat exchange pipe, and the side wall of the box body is provided with a second limiting hole corresponding to the heat pipe.

[0014] Preferably, the heat pipe comprises a tube shell, a liquid wick and a steam flow channel arranged from the outside to the inside, and the liquid wick is filled with a cooling medium.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] 1. Cross-arranged heat pipes can increase the heat exchange area, improve the heat conduction efficiency, improve the uniformity of the internal temperature of the phase change material, and improve the heat exchange performance;

[0017] 2. The heat exchange tube is set as a U-shaped tube, one end of the heat pipe is on one side of the U-shaped tube, and the other end of the heat pipe is on the other side of the U-shaped tube. The middle section of the heat pipe passes through the middle of the U-shaped tube, and the heat exchange area with the phase change material is large. The phase change materials in various places in the working chamber 4 are close to the heat exchange point, and the heat exchange efficiency of the entire heat storage chamber is high;

[0018] 3. The first pipe section and the second pipe section of the heat pipe correspond to the inner walls on both sides of the box, and the third pipe section is located in the middle. During the melting or solidification process of the phase change material, the temperature of the liquid phase of the phase change material can be quickly transferred to the vicinity of the solidified phase change material, effectively solving the problem of uneven temperature distribution during the melting or solidification process of the phase change material, and further accelerating the phase change rate;

[0019] 4. The heat pipe is small in size, and the internal working fluid can quickly conduct heat, which speeds up the working efficiency of the overall heat storage chamber equipment and does not affect the size of the overall heat storage chamber equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the box structure of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure inside the box of the embodiment;

[0022] Figure 3 1. It is a schematic diagram of the top view of the heat exchange tube and the heat pipe in the embodiment;

[0023] Figure 4 1. It is a schematic diagram of the side view structure of the heat exchange tube and the heat pipe of the embodiment;

[0024] Figure 5 is a schematic diagram of the external structure of a heat pipe in an embodiment;

[0025] Figure 6 is a schematic diagram of the internal structure of a heat pipe in an embodiment;

[0026] Figure 7 It is a schematic diagram of the working state of the heat pipe when the phase change material stores heat;

[0027] Figure 8 It is a schematic diagram of the working state of the heat pipe when the phase change material releases heat;

[0028] Fig. 9 It is a schematic diagram of the overall structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0030] like Figure 1 , Figure 2 and Fig. 9As shown, a novel phase-change heat storage chamber structure with cross-arranged heat pipes includes a box body 1, heat exchange tubes 2 and heat pipes 3. The box body 1 includes a rectangular box shell and a box top plate. An insulation layer 103 is provided in the box body 1. The insulation layer 103 is used to reduce the heat exchange between the inside and outside of the box body 1. A working chamber 4 is provided in the box body 1, and the working chamber 4 is used to accommodate phase change materials. In this embodiment, the phase change material is paraffin. The heat exchange tube 2 and the heat pipe 3 are arranged in the working chamber 4. The heat exchange tube 2 is connected to the external mother tube, and the mother tube is connected to each heat exchange tube 2 through a connecting valve (external equipment such as the mother tube and the connecting valve are not shown in the figure). The heat exchange tube 2 is used to circulate a heat transfer fluid. The heat transfer fluid flows in from one end of the heat exchange tube 2 and out from the other end. The heat transfer fluid exchanges heat with the phase change material through the tube wall of the heat exchange tube 2. The flow rate of the heat transfer fluid entering each heat exchange tube 2 can be evenly distributed by adjusting the opening of the connecting valve, so that the flow rate of the heat transfer fluid in each heat exchange tube 2 tends to be consistent, and the temperature of the phase change process of the phase change material inside the entire box body is evenly distributed. A first limiting hole 101 corresponding to the heat exchange tube 2 is provided on the top plate of the box body 1. When connected, the outer wall of the heat exchange tube 2 is welded to the first limiting hole 101, and the mother tube is welded to the heat exchange tube 2. A second limiting hole 102 corresponding to the heat pipe 3 is provided on the side wall of the rectangular box shell of the box body 1. The second limiting hole 102 can limit the heat pipe 3, and the heat pipe 3 can also be welded to the second limiting hole 102.

[0031] like Figure 2 , Figure 3 and Figure 4 As shown, three heat exchange tubes 2 are arranged side by side in the working chamber 4 (the number of heat exchange tubes 2 can be arranged in multiples according to the capacity of the box body). The heat exchange tube 2 is a U-shaped tube, and the U-shaped opening of the heat exchange tube 2 is arranged upward. The heat exchange tube 2 includes a fourth tube segment 21, a fifth tube segment 22 and a sixth tube segment 23. The fourth tube segment 21 and the fifth tube segment 22 are the same straight tubes and the fifth tube segment 22 corresponds to the fourth tube segment 21. The sixth tube segment 23 is an arc tube. The sixth tube segment 23 is connected between the fourth tube segment 21 and the fifth tube segment 22. The sixth tube segment 23 connects the lower end of the fourth tube segment 21 with the lower end of the fifth tube segment 22. The fourth tube segment 21 is aligned with the inner wall of one side of the box body 1. The fifth pipe segment 22 corresponds to the inner wall position on the other side of the box body 1, and the fourth pipe segment 21 and the fifth pipe segment 22 are perpendicular to the direction in which the three heat exchange tubes 2 are arranged side by side, and the surface where the fourth pipe segment 21 and the fifth pipe segment 22 are located is also perpendicular to the direction in which the three heat exchange tubes 2 are arranged side by side, and the sixth pipe segment 23 is close to the inner bottom wall of the box body 1, so that the heat transfer liquid in the heat exchange tube 2 and the part of the phase change material close to the heat exchange tube 2, that is, the outer part of the entire phase change material in the working chamber 4, exchanges heat faster, and exchanges heat with the phase change material in the middle part of the working chamber 4 is slower.

[0032] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the heat pipe 3 includes a first pipe segment 31, a second pipe segment 32 and a third pipe segment 33. The first pipe segment 31 and the second pipe segment 32 are both the same straight pipes, and the third pipe segment 33 is a diagonal pipe. The third pipe segment 33 is connected between the first pipe segment 31 and the second pipe segment 32. The two heat pipes 3 arranged up and down form a working group, and each working group corresponds to a position of a heat exchange tube 2 (multiple working groups can be arranged at each heat exchange tube 2), and the heat pipe 3 of each working group is arranged above the sixth pipe segment 23, and the same side of the fourth pipe segment 21 and the fifth pipe segment 22 of the heat exchange tube 2 is the first side, and the heat exchange tube 2 The other side of the fourth pipe segment 21 and the fifth pipe segment 22 is the second side, the first pipe segment 31 of the heat pipe 3 is located on the first side, the second pipe segment 32 of the heat pipe 3 is located on the second side, the position of the first pipe segment 31 corresponds to the position of the inner wall on one side of the box body 1, the second pipe segment 32 corresponds to the position of the inner wall on the other side of the box body 1, the third pipe segment 33 is located between the fourth pipe segment 21 and the fifth pipe segment 22, and the upper and lower heat pipes 3 have different directions, the third pipe segments 33 of the two heat pipes 3 in each working group cross, and the projections of the two third pipe segments 33 on the bottom surface of the box body 1 form an X shape, and the two heat pipes 3 also form an X shape when viewed from a top view. The heat pipe 3 adopts the existing heat pipe structure. The heat pipe 3 includes a tube shell 301, a liquid wick 302 and a steam flow channel 303 arranged from the outside to the inside. The tube shell 301 exchanges heat with the external phase change material. The liquid wick 302 is a sintered copper porous structure. The liquid wick 302 is filled with a cooling medium. In this embodiment, the cooling medium is alcohol. The wall of the tube shell 301 absorbs heat. The cooling medium in the liquid wick 302 absorbs heat and evaporates into gas. Under the action of the internal pressure difference, it flows along the steam flow channel 303 to the low-temperature end. After reaching the low-temperature end, it condenses into liquid and is absorbed by the capillary core of the liquid wick 302. The fluid flows along the liquid wick 302 to the heating section under the action of capillary force. The heat pipe 3 is completely closed, and the internal cooling medium realizes the evaporation-condensation cycle process with heat exchange. The two ends of the heat pipe 3 are close to the heat exchange tube 2, and the middle section is wrapped with a large amount of phase change material. When storing heat, the temperature of the heat transfer fluid in the heat exchange tube 2 is high, and the temperature of the phase change material rises and melts. During the melting process of the phase change material, the phase change material near the heat exchange tube 2 heats up quickly, and the heat pipe 3 quickly transfers the heat at both ends to the middle section (such as Figure 7 As shown, after the two ends are heated, the alcohol evaporates and vapor flows to the middle. After condensation, the liquid alcohol flows from the absorbent core 302 to the two ends), promoting the melting of the internal phase change material. When releasing heat, the temperature of the heat transfer liquid in the heat exchange tube 2 is low, and the temperature of the phase change material drops and solidifies. During the solidification process of the phase change material, the phase change material near the heat exchange tube 2 will solidify quickly. At this time, the flow around the heat exchange tube 2 stops, and the convective heat transfer disappears. The liquid phase change material farther away from the heat exchange tube 2 is difficult to transfer heat to the low temperature quickly, and the solidification of the entire area slows down. The third pipe section 33 of the heat pipe 3 can quickly transfer the heat of the liquid phase change material to the low temperatures at both ends (such as Figure 8 As shown), the temperature uniformity during the phase change process of the internal phase change material is improved and the internal solidification rate is accelerated.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A novel phase-change heat storage chamber structure with cross-arranged heat pipes, characterized in that: The invention comprises a box body (1), a heat exchange tube (2) and a heat pipe (3); a working chamber (4) for accommodating a phase change material is provided in the box body (1); the heat exchange tube (2) and the heat pipe (3) are arranged in the working chamber (4); the heat pipe (3) comprises a first pipe section (31), a second pipe section (32) corresponding to the first pipe section (31) and a third pipe section (33) connected between the first pipe section (31) and the second pipe section (32); the first pipe section (31) is located on one side of the heat exchange tube (2), and the second pipe section (32) is located on the other side of the heat exchange tube (2).

2. According to claim 1, the novel phase change heat storage chamber structure with cross-arranged heat pipes is characterized in that: Two heat pipes (3) arranged vertically form a working group, and two heat pipes (3) in each working group are arranged crosswise.

3. The novel phase change heat storage chamber structure with cross-arranged heat pipes according to claim 1 is characterized in that: The heat exchange tube (2) comprises a fourth tube segment (21), a fifth tube segment (22) corresponding to the fourth tube segment (21), and a sixth tube segment (23) connected between the fourth tube segment (21) and the fifth tube segment (22); one side of the fourth tube segment (21) and the fifth tube segment (22) is a first side, the other side of the fourth tube segment (21) and the fifth tube segment (22) is a second side, the first tube segment (31) is located on the first side, and the second tube segment (32) is located on the second side.

4. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 3 is characterized in that: The heat exchange tube (2) is a U-shaped tube, the fourth tube segment (21) and the fifth tube segment (22) are straight tubes, the sixth tube segment (23) is an arc tube, the fourth tube segment (21) corresponds to the position of the inner wall of one side of the box body (1), and the fifth tube segment (22) corresponds to the position of the inner wall of the other side of the box body (1).

5. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 4 is characterized in that: A plurality of the heat exchange tubes (2) are arranged side by side in the working chamber (4).

6. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 5 is characterized in that: The fourth pipe section (21) and the fifth pipe section (22) are perpendicular to the direction in which the plurality of heat exchange tubes (2) are arranged side by side.

7. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 4 is characterized in that: The third pipe section (33) is located between the fourth pipe section (21) and the fifth pipe section (22).

8. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 1 is characterized in that: The top of the box body (1) is provided with a first limiting hole (101) corresponding to the heat exchange pipe (2), and the side wall of the box body (1) is provided with a second limiting hole (102) corresponding to the heat pipe (3).

9. The novel phase-change heat storage chamber structure with cross-arranged heat pipes according to claim 1 is characterized in that: The heat pipe (3) comprises a tube shell (301), a liquid wick (302) and a steam flow channel (303) arranged from the outside to the inside, and the liquid wick (302) is filled with a cooling medium.

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