Medium and low temperature phase change energy storage device of novel heat exchange structure

Abstract

The invention discloses a medium and low temperature phase change energy storage device of a novel heat exchange structure, which comprises a box body, the bottom of the box body is provided with a discharge port, the top of the box body is provided with a feed port, five rows of coil pipes are arranged in the box body, the lower parts of the five rows of coil pipes are heat exchange fluid inlets, and the upper parts of the five rows of coil pipes are heat exchange fluid outlets; the distances between the tops and the bottoms of the five rows of coil pipes in the vertical direction and the top surface and the bottom surface of the box body are the same; one end of the box body is connected with a buffer water tank, the buffer water tank is connected with an electric boiler, the other end of the box body is connected with a load water tank, and the load water tank is connected with a water chilling unit; the two ends of the box body are connected with circulating water pumps. According to the method, the overall economical efficiency of the energy storage device is guaranteed, the energy storage efficiency is improved, the time resource utilization rate is increased, and a feasible implementation scheme is provided for promoting the development of the energy storage industry.

Description

Technical Field

[0001] The invention relates to the technical field of phase change energy storage, and in particular to a medium- and low-temperature phase change energy storage device with a novel heat exchange structure. Background Art

[0002] The low price and easy accessibility of medium and low temperature phase change materials and their high phase change latent heat characteristics make medium and low temperature phase change devices very feasible and popularizable, and can well realize the storage and utilization of thermal energy. Phase change energy storage technology refers to the technology that phase change materials absorb excess heat in the system during the phase change process and release this part of heat for reuse when needed. It can improve the problem of imbalance between energy supply and demand, improve the effective utilization rate of energy, and has broad application prospects in the fields of building energy conservation, solar energy utilization and industrial production waste heat recovery.

[0003] However, due to the different heat exchange structures, phase change energy storage devices are prone to uneven heat exchange, poor heat release, and low heat storage and release ratio when exchanging heat with phase change materials. When performing overall heat exchange, there will be local fast heat exchange and local slow heat exchange, which will affect the overall heat exchange efficiency. Even because the local heat exchange effect is too unsatisfactory, there will be heat exchange dead corners, that is, there will be areas where heat exchange does not occur, which will affect the utilization rate of the device and bring great waste to the use of materials.

[0004] To solve this problem, this patent proposes a new phase change heat transfer structure. Summary of the invention

[0005] The purpose of the present invention is to provide a medium-low temperature phase change energy storage device with a novel heat exchange structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a medium-low temperature phase change energy storage device with a novel heat exchange structure, comprising a box, a discharge port is arranged at the bottom of the box, a feed port is arranged at the top of the box, five rows of coils are arranged inside the box, and the lower part of the five rows of coils is a heat exchange fluid inlet, the upper part is a heat exchange fluid outlet, and the top and bottom of the five rows of coils in the vertical direction are at the same distance from the top surface and the bottom surface of the box respectively;

[0007] One end of the box is connected to a buffer water tank, which is connected to an electric boiler, and the other end of the box is connected to a load water tank, which is connected to a chiller; both ends of the box are connected to circulating water pumps.

[0008] Preferably, the five rows of coils are serpentine heat exchange coils, a single row of coils has one inlet and one outlet, and the heat exchange fluid inlet and the heat exchange fluid outlet of the five rows of coils are both provided with a collecting coil.

[0009] Preferably, the five rows of coils inside the box have the same spacing and are evenly distributed vertically between the two side walls of the box.

[0010] Preferably, the box body adopts a large heat storage density box body, the heat storage density reaches 90%, and the overall structure is a rectangular structure.

[0011] Preferably, medium and low temperature phase change materials are filled between the five rows of coils and the box.

[0012] Preferably, a valve M1 is provided at the input end of the electric boiler, a valve M2 is provided at the output end of the buffer water tank, and a valve M3 is provided between the input end of the electric boiler and the output end of the buffer water tank, a valve M4 is provided at the input end of the box body, a valve M5 is provided at the output end of the box body, a valve M6 is provided at the input end of the circulating water pump, a valve M7 and a valve M8 are provided on the load water tank, and valves M7 and valve M8 are located at both ends of valve M6, and valves M9 and valves M10 are provided on the chiller.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The design purpose of this heat exchange structure is to increase the overall heat exchange effect of the device, shorten the heat storage time, and increase the energy storage efficiency under the premise of ensuring economy. The heat storage density of the device is discussed, and the heat storage density of the device under different sizes and different heat exchange structures is discussed. The device with the largest heat storage density is selected to ensure the maximum heat storage capacity of the device, speed up the overall heat storage process of the device, improve the heat exchange effect of the device, reduce the heat storage time cost, and resource cost to promote the development of current energy storage technology.

[0015] In summary, the novel phase change heat transfer structure of the present invention not only ensures the overall economy of the energy storage device, but also increases the energy storage efficiency and improves the utilization rate of time resources, thus providing a feasible implementation plan for promoting the development of the energy storage industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the box structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the five-row coil structure of the present invention.

[0019] In the figure: 1. Electric boiler; 2. Buffer water tank; 3. Tank; 4. Circulating water pump; 5. Chiller; 6. Load water tank; 31. Five rows of coils; 32. Heat exchange fluid inlet; 33. Heat exchange fluid outlet. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-3 The present invention provides a technical solution: a medium-low temperature phase change energy storage device with a novel heat exchange structure, comprising a box body 3, a discharge port is arranged at the bottom of the box body 3, a feed port is arranged at the top of the box body 3, five rows of coils 31 are arranged inside the box body 3, and the lower part of the five rows of coils 31 is a heat exchange fluid inlet 32, and the upper part is a heat exchange fluid outlet 33, and the top and bottom of the five rows of coils 31 in the vertical direction are at the same distance from the top surface and the bottom surface of the box body 1 respectively;

[0022] One end of the box body 3 is connected to a buffer water tank 2, and the buffer water tank 2 is connected to an electric boiler 1. The other end of the box body 3 is connected to a load water tank 6, and the load water tank 6 is connected to a chiller 5. Both ends of the box body 3 are connected to a circulating water pump 4.

[0023] In the present invention, the five rows of coils 31 are serpentine heat exchange coils, and a single row of coils has one inlet and one outlet. The heat exchange fluid inlet 32 ​​and the heat exchange fluid outlet 33 of the five rows of coils 31 are both provided with a collection coil.

[0024] In the present invention, five rows of coils 31 inside the box body 3 are evenly and vertically distributed between two side walls of the box body 3 with the same row spacing.

[0025] In the present invention, the box body 3 adopts a large heat storage density box body, the heat storage density reaches 90%, and the overall structure is a rectangular parallelepiped structure.

[0026] In the present invention, the space between the five rows of coils 31 and the box body 3 is filled with medium and low temperature phase change materials.

[0027] In the present invention, a valve M1 is provided at the input end of the electric boiler 1, a valve M2 is provided at the output end of the buffer water tank 2, and a valve M3 is provided between the input end of the electric boiler 1 and the output end of the buffer water tank 2, a valve M4 is provided at the input end of the box body 3, a valve M5 is provided at the output end of the box body 3, a valve M6 is provided at the input end of the circulating water pump 4, a valve M7 and a valve M8 are provided on the load water tank 6, and the valves M7 and M8 are located at both ends of the valve M6, and a valve M9 and a valve M10 are provided on the chiller 5.

[0028] The structure of the present invention performs local enhanced heat conduction treatment on the heat exchange coil, changes the coil spacing at the hot water inlet, and maximizes the heat exchange effect while ensuring the same overall heat exchange serpentine coil usage and the same heat exchange area, so that the overall heat exchange inside the device is uniform, avoiding regional unevenness and overall slow progress caused by low thermal conductivity of the material, thereby accelerating the overall heat exchange process and improving the energy storage efficiency of the phase change material. This patent aims to achieve efficient energy storage and thus optimize the use of energy.

[0029] Combination Figure 2 and Figure 3 The operation mode is introduced. The box adopts a large heat storage density box with a heat storage density of 90%. The overall structure is a rectangular structure with a heat exchange coil inside. The medium and low temperature phase change material is filled between the internal heat exchange coil and the box wall. A feed port is set on the top of the box to load the phase change material. The side wall of the bottom of the box is equipped with a discharge port, which can replace different types of phase change materials. The heat exchange coil is a serpentine coil. There are five rows of independent coils inside the device, which are summarized into one in and one out form outside the box. Therefore, the heat exchange conditions of each row of coils are basically the same. The heat exchange fluid enters from the bottom and exits from the top. Considering that the temperature of the inlet heat exchange fluid is high, the heat exchange in the inlet area is sufficient, and the temperature of the outlet heat exchange fluid is low, and the heat exchange effect is poor. Therefore, the upper and lower tube spacing of the heat exchange coil is adjusted to find the optimal spacing ratio. Reducing the upper coil spacing is conducive to heat exchange in the upper area with lower temperature, thereby enhancing the overall heat exchange and accelerating the overall heat storage and release efficiency. At the same time, the heat exchange flow of the five-row coil is relatively large, and electromagnetic valves can be added at the inlet and outlet to adjust the heat exchange rate and control the heat exchange process by controlling the flow of the heat exchange fluid.

[0030] Heat storage process: open M1, M2, M4, M5, M6, and close M3, M7, M8, M9, and M10. The electric boiler supplies 90°C hot water, which is pressurized by the circulating water pump. The hot water enters the phase change energy storage device and the phase change material for heat exchange. The heat exchange material absorbs heat and the heat storage process is carried out. The heat storage lasts for eight hours and the heat storage is completed.

[0031] Heat release process: close M1, M2, and M6, and open M3, M7, M8, M9, and M10. At this time, the energy storage device and the load water tank side form a loop, and the electric boiler does not participate in the process. Turn on the chiller to simulate winter conditions. At this time, the energy storage device is in heating mode, and the temperature of the 30℃ low-temperature heat exchange fluid is increased, and it is mixed with the cold water generated by the chiller in the load water tank to simulate the winter heating mode. The heat is released for eight hours, and the heat release is completed. The heat storage process is repeated to achieve a heat storage and release cycle.

[0032] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by ordinary technicians in the field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A medium and low temperature phase change energy storage device with a novel heat exchange structure, characterized in that: It comprises a box body (3), the bottom of the box body (3) is provided with a discharge port, the top of the box body (3) is provided with a feed port, five rows of coils (31) are provided inside the box body (3), the lower part of the five rows of coils (31) is a heat exchange fluid inlet (32), the upper part is a heat exchange fluid outlet (33), and the top and bottom of the five rows of coils (31) are at the same distance from the top surface and the bottom surface of the box body (1) in the vertical direction; One end of the box body (3) is connected to a buffer water tank (2), and the buffer water tank (2) is connected to an electric boiler (1); the other end of the box body (3) is connected to a load water tank (6), and the load water tank (6) is connected to a chiller (5); and both ends of the box body (3) are connected to a circulating water pump (4).

2. According to claim 1, a medium-low temperature phase change energy storage device with a novel heat exchange structure is characterized in that: The five rows of coils (31) are serpentine heat exchange coils, each row of coils has one inlet and one outlet, and the heat exchange fluid inlet (32) and the heat exchange fluid outlet (33) of the five rows of coils (31) are both provided with a collecting coil.

3. According to the novel heat exchange structure of claim 1, the medium and low temperature phase change energy storage device is characterized by: The five rows of coils (31) inside the box (3) are evenly and vertically distributed between the two side walls of the box (3) at the same row spacing.

4. According to the novel heat exchange structure of claim 1, the medium and low temperature phase change energy storage device is characterized by: The box body (3) is a box body with a large heat storage density, the heat storage density reaches 90%, and the overall structure is a rectangular parallelepiped structure.

5. According to the novel heat exchange structure of claim 1, the medium and low temperature phase change energy storage device is characterized by: Medium and low temperature phase change material is filled between the five rows of coils (31) and the box (3).

6. According to the novel heat exchange structure of claim 1, the medium and low temperature phase change energy storage device is characterized by: The input end of the electric boiler (1) is provided with a valve M1, the output end of the buffer water tank (2) is provided with a valve M2, and a valve M3 is provided between the input end of the electric boiler (1) and the output end of the buffer water tank (2), the input end of the box body (3) is provided with a valve M4, the output end of the box body (3) is provided with a valve M5, the input end of the circulating water pump (4) is provided with a valve M6, the load water tank (6) is provided with a valve M7 and a valve M8, and the valves M7 and M8 are located at both ends of the valve M6, and the chiller (5) is provided with a valve M9 and a valve M10.

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