Energy accumulator

Abstract

The invention discloses an energy accumulator. The energy accumulator comprises a box body; the heat exchanger comprises an energy storage heat exchanger and an energy release heat exchanger, the energy storage heat exchanger and the energy release heat exchanger are arranged in the first direction, the two opposite ends, in the second direction, of the heat exchanger are the first end and the second end respectively, the first direction is perpendicular to the second direction, and the energy release heat exchanger releases energy outwards from the second end; and the heat conduction enhanced heat storage material is arranged in the box body, in the direction from the first end to the second end, the heat conductivity of the heat conduction enhanced heat storage material is gradually increased, and the density of the heat conduction enhanced heat storage material is gradually reduced. According to the energy accumulator, the overall heat exchange power of the heat exchanger is balanced, the heat utilization rate is improved, the heat exchange efficiency of the heat exchanger is improved, and the efficiency of the energy accumulator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of accumulators, and in particular to an accumulator. Background Art

[0002] During the heat release process of the phase change accumulator, the heat-conducting enhanced heat storage material will release heat and solidify on the surface of the heat exchanger to form a solid heat-conducting enhanced heat storage material layer. During the heat release process, the heat transfer fluid flows along the pipeline to absorb heat and increase the temperature, so the temperature difference upstream is large, the heat transfer power is large, and the temperature difference downstream is small, and the heat transfer power decreases. Conventional accumulators cannot adapt to the problem of heat transfer power incoordination caused by regional heat transfer differences in heat exchangers, which will reduce the efficiency of the accumulator. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an accumulator, which balances the heat exchange power of the heat exchanger as a whole, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger, and thus improving the efficiency of the accumulator.

[0004] An energy accumulator according to an embodiment of the present invention comprises: a housing; a heat exchanger, wherein the heat exchanger comprises an energy storage heat exchanger and an energy release heat exchanger, wherein the energy storage heat exchanger and the energy release heat exchanger are arranged along a first direction, and the two opposite ends of the heat exchanger along a second direction are respectively a first end and a second end, wherein the first direction and the second direction are perpendicular, and the energy release heat exchanger releases energy outward from the second end; and a thermal conductivity enhanced heat storage material, wherein the thermal conductivity enhanced heat storage material is arranged in the housing, and in the direction from the first end to the second end, the thermal conductivity of the thermal conductivity enhanced heat storage material gradually increases, and the density of the thermal conductivity enhanced heat storage material gradually decreases.

[0005] According to the energy accumulator of the embodiment of the present invention, the thermal conductivity of the thermal conductivity enhanced heat storage material is gradually increased, and the density of the thermal conductivity enhanced heat storage material is gradually reduced, so that the density of the thermal conductivity enhanced heat storage material near the second end is smaller than the density of the thermal conductivity enhanced heat storage material near the first end, so that the thermal conductivity enhanced heat storage materials with different thermal conductivities can be layered in the direction from the second end to the first end, avoiding the mixing of thermal conductivity enhanced heat storage materials with different thermal conductivities, thereby balancing the problem of decreased heat exchange power caused by the increasingly smaller temperature difference between the heat exchange medium and the thermal conductivity enhanced heat storage material in the energy release heat exchanger in the direction from the first end to the second end, thereby balancing the overall heat exchange power of the heat exchanger, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger, and thus improving the efficiency of the energy accumulator.

[0006] In some embodiments of the present invention, the heat exchange medium in the energy release heat exchanger flows from the first end to the second end; and / or, the heat exchange medium in the energy storage heat exchanger flows from the first end to the second end; and / or, the heat exchange medium in the energy storage heat exchanger flows from the second end to the first end.

[0007] In some embodiments of the present invention, the thermal conductivity enhanced heat storage material includes a main material, an auxiliary material and a thermal conductivity enhancer, and the content of the thermal conductivity enhancer gradually increases in the direction from the first end to the second end.

[0008] In some embodiments of the present invention, the main material is sodium acetate trihydrate; and / or the thermal conductivity enhancer is expanded graphite.

[0009] In some embodiments of the present invention, the auxiliary materials include a nucleating agent, a thickener and a modifier, the nucleating agent includes at least one of borax, nano metals and oxides, and disodium hydrogen phosphate decahydrate; and / or, the thickener includes at least one of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide; and / or, the modifier includes at least one of formamide, urea, and lithium chloride.

[0010] In some embodiments of the present invention, the content of the thermal conductivity enhancing agent increases gradually in a step-by-step manner in the direction from the first end to the second end.

[0011] In some embodiments of the present invention, the thermal conductivity enhanced heat storage material includes a first heat storage material and a second heat storage material, the density of the first heat storage material is greater than the density of the second heat storage material, the thermal conductivity of the first heat storage material is less than the thermal conductivity of the second heat storage material, the first heat storage material is arranged on a side close to the first end, and the second heat storage material is arranged on a side close to the second end.

[0012] In some embodiments of the present invention, the energy storage heat exchanger and the energy release heat exchanger are both tube-fin heat exchangers.

[0013] In some embodiments of the present invention, the fins of at least one of the energy storage heat exchanger and the energy release heat exchanger are flat sheets or window sheets.

[0014] In some embodiments of the present invention, at least one of the energy storage heat exchanger and the energy release heat exchanger includes a plurality of U-shaped tubes arranged in the second direction, and the distance between two adjacent U-shaped tubes is 15-25 mm; and / or, the distance between two adjacent fins of at least one of the energy storage heat exchanger and the energy release heat exchanger is 1-3 mm; and / or, the width of the fins of at least one of the energy storage heat exchanger and the energy release heat exchanger in the first direction is 12-25 mm.

[0015] In some embodiments of the present invention, there are multiple energy-releasing heat exchangers and multiple energy-storing heat exchangers, the number of energy-releasing heat exchangers is twice the number of energy-storing heat exchangers, and two energy-releasing heat exchangers are arranged between any two adjacent energy-storing heat exchangers.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a perspective view of an accumulator according to an embodiment of the present invention, wherein the box body is not shown;

[0019] Figure 2 is a piping schematic diagram of an accumulator according to an embodiment of the present invention;

[0020] Figure 3 is a perspective view of an accumulator according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 10. Accumulator;

[0023] 1. Box body;

[0024] 2. Heat exchanger; 21. Energy storage heat exchanger; 22. Energy release heat exchanger; 23. U-shaped tube; 24. Fin; 25. First end; 26. Second end; 27. Collecting pipe; 28. Inlet and outlet pipes. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] 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 indicate positions or positional relationships based on the positions 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 cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The accumulator 10 according to an embodiment of the present invention will be described below with reference to the drawings.

[0029] like Figure 1-Figure 3 As shown, the accumulator 10 according to the embodiment of the present invention includes a housing 1, a heat exchanger 2 and a thermal conductivity enhanced heat storage material.

[0030] Specifically, refer to Figure 1 and Figure 3 The heat exchanger 2 includes an energy storage heat exchanger 21 and an energy release heat exchanger 22. The energy storage heat exchanger 21 and the energy release heat exchanger 22 are arranged along a first direction (eg Figure 1 The heat exchanger 2 is arranged in the direction a as shown in FIG. 1 , and the two opposite ends of the heat exchanger 2 along the second direction (the direction b as shown in FIG. 1 ) are respectively a first end 25 and a second end 26, the first direction and the second direction are perpendicular, the energy-releasing heat exchanger 22 releases energy outward from the second end 26, and the thermal conductivity enhanced heat storage material is arranged in the box body 1.

[0031] It can be understood that the energy storage heat exchanger 21 is used for heat conduction enhanced heat storage material energy storage, and the energy release heat exchanger 22 is used for heat conduction enhanced heat storage material energy release. The energy storage heat exchanger 21 and the energy release heat exchanger 22 are placed in the box 1 and at least partially immersed in the heat conduction enhanced heat storage material, wherein the heat conduction enhanced heat storage material is a phase change material, which refers to a material that changes the state of matter (solid-liquid transition) under constant temperature and can provide latent heat. The process of changing physical properties (solid-liquid transition) is called a phase change process, and at this time, the phase change material will absorb or release a large amount of latent heat.

[0032] Furthermore, if Figure 1 and Figure 3 As shown, in the direction from the first end 25 to the second end 26, the thermal conductivity of the thermally conductive enhanced heat storage material gradually increases, and the density of the thermally conductive enhanced heat storage material gradually decreases. Since the energy-releasing heat exchanger 22 releases energy outward from the second end 26, the temperature difference between the heat exchange medium in the energy-releasing heat exchanger and the thermally conductive enhanced heat storage material becomes smaller and smaller in the direction from the first end to the second end, and the heat exchange power gradually decreases. In the present invention, in the direction from the first end 25 to the second end 26, the thermal conductivity of the thermally conductive enhanced heat storage material gradually increases, thereby balancing the problem of decreased heat exchange power caused by the smaller temperature difference between the heat exchange medium in the energy-releasing heat exchanger 22 and the thermally conductive enhanced heat storage material in the direction from the first end 25 to the second end 26, thereby balancing the overall heat exchange power of the heat exchanger 2, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger 2, and thus improving the efficiency of the energy accumulator 10.

[0033] Furthermore, if Figure 1 and Figure 3 As shown, the first end 25 is the lower end and the second end 26 is the upper end. In the direction from the first end 25 to the second end 26, the density of the thermal conductivity enhanced thermal storage material gradually decreases, so that the density of the thermal conductivity enhanced thermal storage material near the second end 26 is less than the density of the thermal conductivity enhanced thermal storage material near the first end 25. Since the first end 25 is the lower end and the second end 26 is the upper end, under the action of gravity, the thermal conductivity enhanced thermal storage material near the first end 25 naturally sinks, and the thermal conductivity enhanced thermal storage material near the second end 26 naturally floats, so that the thermal conductivity enhanced thermal storage materials with different thermal conductivities can be layered in the direction from the second end 26 to the first end 25 (from top to bottom), avoiding the mixing of thermal conductivity enhanced thermal storage materials with different thermal conductivities.

[0034] According to the energy accumulator 10 of the embodiment of the present invention, the thermal conductivity of the thermally conductive enhanced heat storage material is gradually increased and the density of the thermally conductive enhanced heat storage material is gradually reduced in the direction from the first end 25 to the second end 26, so that the density of the thermally conductive enhanced heat storage material near the second end 26 is smaller than the density of the thermally conductive enhanced heat storage material near the first end 25, so that the thermally conductive enhanced heat storage materials with different thermal conductivities can be layered in the direction from the second end 26 to the first end 25, avoiding the mixing of thermally conductive enhanced heat storage materials with different thermal conductivities, thereby balancing the problem of decreased heat exchange power caused by the increasingly smaller temperature difference between the heat exchange medium and the thermally conductive enhanced heat storage material in the energy release heat exchanger 22 in the direction from the first end 25 to the second end 26, thereby balancing the overall heat exchange power of the heat exchanger 2, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger 2, and thus improving the efficiency of the energy accumulator 10.

[0035] In some embodiments of the present invention, the thermal conductivity enhanced heat storage material includes a main material, an auxiliary material and a thermal conductivity enhancer, and the content of the thermal conductivity enhancer gradually increases in the direction from the first end 25 to the second end 26 .

[0036] like Figure 1 and Figure 2 As shown, when the heat exchange medium in the energy storage heat exchanger 21 or the energy release heat exchanger 22 flows from the first end 25 to the second end 26, the temperature difference between the heat exchange medium in the energy storage heat exchanger or the energy release heat exchanger and the heat conductivity enhanced heat storage material becomes smaller and smaller in the direction from the first end to the second end, and the heat exchange power gradually decreases. In the direction from the first end 25 to the second end 26, the content of the heat conductivity enhancer gradually increases, so that the thermal conductivity of the heat conductivity enhanced heat storage material continues to increase in the direction from the first end 25 to the second end 26, so that In the direction of the second end 26, the heat exchange efficiency between the heat exchange medium in the energy storage heat exchanger 21 or the energy release heat exchanger 22 and the thermal conductivity enhanced heat storage material is continuously increased, thereby balancing the problem of the continuous decrease in heat exchange power caused by the increasingly smaller temperature difference between the heat exchange medium in the energy storage heat exchanger 21 or the energy release heat exchanger 22 and the thermal conductivity enhanced heat storage material in the direction from the first end 25 to the second end 26, thereby balancing the overall heat exchange power of the heat exchanger 2, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger 2, and thus improving the efficiency of the accumulator 10.

[0037] In the present invention, the relationship between the thermal conductivity of the thermal conductivity enhanced thermal storage material and the amount of the thermal conductivity enhancer is shown in Table 1, wherein the higher the content of the thermal conductivity enhancer, the higher the thermal conductivity of the thermal conductivity enhanced thermal storage material, and the higher the heat exchange efficiency.

[0038] Table 1: Relationship between thermal conductivity of thermal conductivity enhanced thermal storage materials and thermal conductivity enhancer content

[0039] Thermal conductivity enhancer content% Thermal conductivity W / m·K 0 0.62 1 0.75 1.5 0.83 2 0.93

[0040] In some embodiments of the present invention, the main material is sodium acetate trihydrate. It can be understood that sodium acetate trihydrate has high energy storage density, high thermal conductivity and the characteristics of passive heat storage and heat release under approximately constant temperature conditions. Therefore, sodium acetate trihydrate as the main material can improve the energy storage and energy release efficiency of the accumulator 10. When the energy storage heat exchanger 21 is working, sodium acetate trihydrate undergoes a phase change from solid to liquid, while absorbing a large amount of heat. When the energy release heat exchanger 22 is working, sodium acetate trihydrate undergoes a phase change from liquid to solid, and releases the previously absorbed heat to provide thermal energy, thereby realizing the energy storage and energy release work of the accumulator 10.

[0041] Furthermore, the thermal conductivity enhancer is expanded graphite, which has high thermal conductivity and low density. Thus, the thermal conductivity of the thermal conductivity enhanced heat storage material is improved, thereby improving the heat exchange efficiency of the heat exchanger 2. At the same time, due to the low density of the expanded graphite, the thermal conductivity enhanced heat storage material is lighter at the same volume, thereby reducing the weight of the accumulator 10.

[0042] In some embodiments of the present invention, the auxiliary materials include nucleating agents, thickeners and modifiers. It is understood that the nucleating agent can promote the smooth crystallization of the thermal conductivity enhanced thermal storage material, so that the thermal conductivity enhanced thermal storage material can better release heat and solidify on the surface of the heat exchanger 2. The thickener can increase the viscosity of the thermal conductivity enhanced thermal storage material, thereby preventing the hydrated salt (sodium acetate trihydrate) from producing phase stratification and avoiding the failure of the thermal conductivity enhanced thermal storage material. At the same time, the modifier accelerates the crystallization speed of the thermal conductivity enhanced thermal storage material and increases the crystal density of the thermal conductivity enhanced thermal storage material, thereby further allowing the thermal conductivity enhanced thermal storage material to release heat and solidify on the surface of the heat exchanger 2, thereby improving the heat exchange efficiency.

[0043] In some embodiments of the present invention, the nucleating agent includes at least one of borax, nano-metals and oxides, and disodium hydrogen phosphate decahydrate. For example, the nucleating agent can be one of borax, nano-metals and oxides, and disodium hydrogen phosphate decahydrate, or a mixture of two of borax, nano-metals and oxides, and disodium hydrogen phosphate decahydrate, or a mixture of borax, nano-metals and oxides, and disodium hydrogen phosphate decahydrate. Thus, the nucleating agent can be adjusted according to actual conditions to make the crystallization of the thermal conductivity enhanced heat storage material smooth.

[0044] Further, the thickener includes at least one of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide. For example, the thickener can be one of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide, or a mixture of two of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide, or a mixture of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide. Thus, the thickener can be adjusted according to actual conditions to better prevent the hydrated salt (sodium acetate trihydrate) from generating phase stratification and avoid the failure of the thermal conductivity enhancement heat storage material.

[0045] Furthermore, the modifier includes at least one of formamide, urea, and lithium chloride. For example, the modifier can be one of formamide, urea, and lithium chloride, or a mixture of two of formamide, urea, and lithium chloride, or a mixture of formamide, urea, and lithium chloride. Thus, the modifier can be adjusted according to actual conditions to better promote the crystallization of the thermal conductivity enhanced thermal storage material.

[0046] In some embodiments of the present invention, the content of the thermal conductivity enhancer increases gradually in a step-like manner in the direction from the first end 25 to the second end 26. It can be understood that in the direction from the first end 25 to the second end 26, the area with equal content of the thermal conductivity enhancer is a layer of area, and the content of the thermal conductivity enhancer in another layer of area adjacent to it and relatively close to the second end 26 is higher than the content of the thermal conductivity enhancer in this layer of area, so that in the direction from the first end 25 to the second end 26, there is no need to adjust the content of the thermal conductivity enhancer in the thermal conductivity enhanced heat storage material at each location, which can simplify the operation and improve the production efficiency.

[0047] For example, in one embodiment of the present invention, in the direction from the first end 25 to the second end 26, the thermal conductivity enhanced heat storage material can be divided into two layers according to the different contents of the thermal conductivity enhancer, and the content of the thermal conductivity enhancer in the layer relatively close to the first end 25 is 0-1%, such as 0, 0.5% or 1%, etc. The content of the thermal conductivity enhancer in the layer relatively close to the second end 26 is 1-2%, such as 1%, 1.5% or 2%, etc.

[0048] For example, in another embodiment of the present invention, in the direction from the first end 25 to the second end 26, the thermal conductivity enhanced heat storage material can be divided into two layers according to the different contents of the thermal conductivity enhancer, and the content of the thermal conductivity enhancer in the layer relatively close to the first end 25 is 1-10%, such as 1, 5% or 10%, etc. The content of the thermal conductivity enhancer in the layer relatively close to the second end 26 is 10-20%, such as 10%, 15% or 20%, etc.

[0049] In some embodiments of the present invention, Figure 1 As shown, both the energy storage heat exchanger 21 and the energy release heat exchanger 22 are tube-fin heat exchangers. It can be understood that the tube-fin heat exchanger has high heat transfer efficiency. Since the fins 24 disturb the fluid and continuously break the boundary layer, it has a large heat transfer coefficient. At the same time, since the fins 24 are very thin and have high thermal conductivity, the heat transfer efficiency of the energy storage heat exchanger 21 and the energy release heat exchanger 22 is improved, thereby improving the heat transfer efficiency of the heat exchanger 2.

[0050] In some embodiments of the present invention, Figure 1As shown, the fins 24 of at least one of the energy storage heat exchanger 21 and the energy discharging heat exchanger 22 are flat sheets or window sheets. It can be understood that the fins 24 of the energy storage heat exchanger 21 and the energy discharging heat exchanger 22 can both be flat sheets, or the fins 24 of the energy storage heat exchanger 21 are flat sheets, and the fins 24 of the energy discharging heat exchanger 22 are window sheets, or the fins 24 of the energy storage heat exchanger 21 are window sheets, and the fins 24 of the energy discharging heat exchanger 22 are flat sheets, or the fins 24 of the energy storage heat exchanger 21 and the energy discharging heat exchanger 22 are window sheets. Among them, the surface of the flat sheet is smooth, the structure is simple, the cost is low, and the production efficiency is high. A plurality of through holes are arranged on the surface of the window sheet, and a plurality of inclined sheets spaced apart along the width direction of the fin 24 are arranged in each through hole. The two ends of the inclined sheets along the length direction of the fin 24 are connected to the hole wall of the through hole. The inclined sheets are inclined to form a certain angle (less than 90 degrees) with the thickness direction and the width direction of the fin 24. The thermal conductivity enhanced heat storage material can flow through the gap between two adjacent inclined sheets in each through hole. The setting of the inclined sheets can increase the contact area between the fin 24 and the thermal conductivity enhanced heat storage material, thereby increasing the heat exchange efficiency of the heat exchanger 2.

[0051] At least one of the fins 24 of the energy storage heat exchanger 21 and the energy release heat exchanger 22 is a flat plate or a window plate, so that the energy storage heat exchanger 21 and the energy release heat exchanger 22 can select and combine the types of fins 24 according to specific circumstances, so that the energy storage heat exchanger 21 and the energy release heat exchanger 22 can meet the heat exchange efficiency while saving costs and improving production efficiency.

[0052] In some embodiments of the present invention, Figure 2 As shown, at least one of the energy storage heat exchanger 21 and the energy release heat exchanger 22 includes a plurality of U-shaped tubes 23 arranged in the second direction, and the distance between two adjacent U-shaped tubes 23 is 15-25 mm, such as 15 mm, 18 mm, 20 mm or 25 mm, etc. Thus, the distance between two adjacent U-shaped tubes 23 is reasonable, thereby preventing the two adjacent U-shaped tubes 23 from being too close to each other and affecting each other, thereby ensuring the heat exchange efficiency of the heat exchanger 2, and also preventing the two adjacent U-shaped tubes 23 from being too large, thereby preventing the heat exchanger 2 from being too large and ensuring the reasonable volume of the heat exchanger 2.

[0053] Further, the distance between two adjacent fins 24 of at least one of the energy storage heat exchanger 21 and the energy release heat exchanger 22 is 1-3 mm, such as 1 mm, 1.5 mm, 2 mm or 3 mm, so that the distance between two adjacent fins 24 is reasonable, and the two adjacent fins 24 are prevented from being too far apart, thereby preventing the heat exchanger 2 from being too large and ensuring the reasonable volume of the heat exchanger 2. It is also possible to avoid the interval between two adjacent fins 24 being too small, which may cause mutual influence, thereby ensuring the heat exchange efficiency of the heat exchanger 2.

[0054] Furthermore, the width of the fins 24 of at least one of the energy storage heat exchanger 21 and the energy release heat exchanger 22 in the first direction is 12-25 mm, for example, 12 mm, 15 mm, 20 mm or 25 mm, etc., thereby making the width of the fins 24 in the first direction reasonable, which not only ensures the heat exchange area and the heat exchange efficiency of the heat exchanger 2, but also avoids the heat exchanger 2 from being too large, ensuring the reasonable volume of the heat exchanger 2.

[0055] For example, Figure 2 In the example shown, the energy storage heat exchanger 21 and the energy release heat exchanger 22 both include 16 U-shaped tubes 23 arranged in the second direction, but the present invention is not limited to this. The energy storage heat exchanger 21 and the energy release heat exchanger 22 may both include more or fewer U-shaped tubes 23 arranged in the second direction, such as 10, 18, 20 or 22, etc.

[0056] In addition, Figure 2 In the example shown, the energy storage heat exchanger 21 and the energy release heat exchanger 22 both include 16 U-shaped tubes 23 arranged in the second direction. In the direction from the first end 25 to the second end 26, the thermal conductivity enhanced heat storage material can be divided into two layers according to the content of the thermal conductivity enhancer, and each layer covers 8 U-shaped tubes 23.

[0057] Furthermore, if Figure 1 As shown, the heat exchanger 2 further includes a plurality of headers 27 and a plurality of inlet and outlet pipes 28 corresponding to the plurality of headers 27. The plurality of headers 27 and the plurality of inlet and outlet pipes 28 are all located at the second end 26 of the heat exchanger 2. The plurality of headers 27 extend along the first direction and extend along the third direction (such as Figure 1 The third direction, the first direction and the second direction are perpendicular to each other, the collecting pipe 27 is connected with the multiple energy storage heat exchangers 21 through multiple external pipe sections, and the collecting pipe 27 is connected with the multiple energy release heat exchangers 22 through multiple external pipe sections.

[0058] Furthermore, if Figure 1 As shown, the multiple inlet and outlet pipes 28 can be multiple heat storage inlet pipes, heat storage outlet pipes, heat exchange inlet pipes and heat exchange outlet pipes. The heat storage inlet pipe and the heat storage outlet pipe are both connected to the energy storage heat exchanger 21 through the header 27 and the outer pipe section, and the heat exchange inlet pipe and the heat exchange outlet pipe are both connected to the energy release heat exchanger 22 through the header 27 and the outer pipe section. The number of inlet and outlet pipes 28 is equal to the sum of the number of heat storage inlet pipes, heat storage outlet pipes, heat exchange inlet pipes and heat exchange outlet pipes. The multiple heat storage outlet pipes correspond to the multiple heat storage inlet pipes one-to-one. The heat storage inlet pipe is used to connect one end of a heating device such as a heater, and the heat storage outlet pipe is used to connect the other end of the heating device. The multiple heat release outlet pipes correspond to the multiple heat release inlet pipes one-to-one. The heat release inlet pipe is used to connect a water source such as a faucet, and the heat release outlet pipe is used to connect water equipment such as a shower head.

[0059] For example, Figure 1 In the example shown, there are four inlet and outlet pipes 28 and four collecting pipes 27, but the present invention is not limited thereto. There may be more inlet and outlet pipes 28 and collecting pipes 27, such as five, six, seven or eight.

[0060] When the accumulator 10 is storing heat, the working process of the energy storage heat exchanger 21 is as follows: after the liquid such as water in the heating device is heated, it passes through the manifold 27 from the heat storage inlet pipe, and then enters the multiple energy storage heat exchangers 21 from the second end 26 to the first end 25 through the outer pipe section between the manifold 27 and the multiple energy storage heat exchangers 21, and then exchanges heat with the thermal conductivity enhanced heat storage material along the multiple U-shaped tubes 23 in the multiple energy storage heat exchangers 21 from the first end 25 to the second end 26, so that the thermal conductivity enhanced heat storage material is heated, and the temperature of the liquid such as water in the energy storage heat exchanger 21 is reduced after the heat exchange is completed. After being collected by the manifold 27, it enters the heating device through the heat storage outlet pipe to complete a heat cycle. At this time, the heating device can heat the liquid after the heat exchange is completed, and prepare for the next heat cycle.

[0061] When the accumulator 10 is releasing heat, the working process of the energy releasing heat exchanger 22 is as follows: the liquid to be heated, such as water, passes through the header 27 from the heat releasing inlet pipe, and then enters the multiple energy releasing heat exchangers 22 from the second end 26 to the first end 25 through the outer pipe section between the header 27 and the multiple energy releasing heat exchangers 22, and then exchanges heat with the thermal conductivity enhanced heat storage material along the multiple U-shaped tubes 23 in the multiple energy releasing heat exchangers 22 from the first end 25 to the second end 26, so that the liquid in the energy releasing heat exchanger 22 is heated, and then after being collected by the header 27, it flows from the heat releasing outlet pipe to the water-using equipment, and finally flows out of the water-using equipment to complete the heating of the liquid.

[0062] In some embodiments of the present invention, Figure 1 As shown, there are multiple energy-releasing heat exchangers 22 and energy-storing heat exchangers 21 , the number of energy-releasing heat exchangers 22 is twice the number of energy-storing heat exchangers 21 , and two energy-releasing heat exchangers 22 are arranged between any two adjacent energy-storing heat exchangers 21 .

[0063] It can be understood that the energy storage heat exchanger 21 is used for heat conduction to enhance the energy storage of the heat storage material, and the energy release heat exchanger 22 is used for heat conduction to enhance the heat release of the heat storage material. Two energy release heat exchangers 22 are arranged between any two adjacent energy storage heat exchangers 21, so that the energy storage heat exchanger 21 and the energy release heat exchanger 22 are arranged adjacent to each other, which can improve the heat transfer efficiency between the energy storage heat exchanger 21 and the energy release heat exchanger 22, reduce energy waste, and improve the heat exchange efficiency of the heat exchanger 2.

[0064] At the same time, since the heat exchanger 2 needs to release heat in time when the user uses water, it can meet the user's immediate water demand. Therefore, the number of energy-releasing heat exchangers 22 is twice the number of energy-storing heat exchangers 21, so that the heat exchange efficiency of the energy accumulator 10 when releasing heat is higher than when storing heat, thereby meeting the user's immediate water demand.

[0065] For example, Figure 1 In the example shown, there are 12 energy-releasing heat exchangers 22 and 6 energy-storing heat exchangers 21, but the present invention is not limited to this. The energy-storing heat exchangers 21 can be more or less, such as 4, 8, 14 or 20, etc. The number of energy-releasing heat exchangers 22 is twice the corresponding number of energy-storing heat exchangers 21.

[0066] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the heat exchange medium in the energy-discharging heat exchanger 22 flows from the first end 25 to the second end 26, and the heat exchange medium in the energy-storing heat exchanger 21 flows from the first end 25 to the second end 26. As a result, the heat exchange medium in the energy-storing heat exchanger 21 and the energy-discharging heat exchanger 22 both flow from the first end 25 to the second end 26, and the heat exchange medium in the energy-storing heat exchanger 21 and the energy-discharging heat exchanger 22 flows in the same direction, thereby balancing the problem of the heat exchange power continuously decreasing due to the decreasing temperature difference between the heat exchange medium in the energy-storing heat exchanger 21 and the energy-discharging heat exchanger 22 and the heat-conducting enhanced heat storage material in the direction from the first end 25 to the second end 26, thereby balancing the heat exchange power of the heat exchanger 2 as a whole, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger 2, and thus improving the efficiency of the energy accumulator 10.

[0067] Further, the heat exchange medium in the energy discharging heat exchanger 22 flows from the first end 25 to the second end 26, and the heat exchange medium in the energy accumulating heat exchanger 21 flows from the second end 26 to the first end 25. As a result, the temperature of the heat exchange medium in the energy discharging heat exchanger 22 gradually decreases from the first end 25 to the second end 26, and the temperature of the heat exchange medium in the energy accumulating heat exchanger 21 gradually increases from the second end 26 to the first end 25, so that the temperature difference between the energy discharging heat exchanger 22 and the energy accumulating heat exchanger 21 is large, and the heat exchange efficiency of the energy discharging heat exchanger 22 and the energy accumulating heat exchanger 21 is improved, thereby further improving the heat exchange efficiency of the heat exchanger 22, thereby improving the efficiency of the energy accumulating heat exchanger 10.

[0068] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the thermal conductivity enhanced heat storage material includes a first heat storage material and a second heat storage material, the density of the first heat storage material is greater than the density of the second heat storage material, the thermal conductivity of the first heat storage material is less than the thermal conductivity of the second heat storage material, the first heat storage material is arranged on a side close to the first end 25, and the second heat storage material is arranged on a side close to the second end 26.

[0069] It can be understood that, under the action of gravity, the first heat storage material naturally sinks and the second heat storage material naturally floats, so that the first heat storage material and the second heat storage material can be layered in the direction from the second end 26 to the first end 25 (from top to bottom), avoiding the mixing of the first heat storage material and the second heat storage material. At the same time, since the thermal conductivity of the first heat storage material is less than the thermal conductivity of the second heat storage material, the problem of decreased heat exchange power caused by the decreasing temperature difference between the heat exchange medium and the thermal conductivity enhanced heat storage material in the energy release heat exchanger 22 in the direction from the first end 25 to the second end 26 is balanced, thereby balancing the overall heat exchange power of the heat exchanger 2, thereby improving the heat utilization rate, improving the heat exchange efficiency of the heat exchanger 2, and thus improving the efficiency of the energy accumulator 10.

[0070] The following describes an accumulator 10 according to a specific embodiment of the present invention with reference to the accompanying drawings. It should be understood that the following description is merely exemplary and is intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0071] Embodiment 1:

[0072] like Figure 1-Figure 3 As shown, the accumulator 10 according to the embodiment of the present invention includes a housing 1, a heat exchanger 2 and a thermal conductivity enhanced heat storage material.

[0073] Furthermore, if Figure 1 and Figure 2 As shown, the heat exchanger 2 includes an energy storage heat exchanger 21 and an energy release heat exchanger 22. The number of the energy release heat exchanger 22 and the energy storage heat exchanger 21 is multiple, the number of the energy release heat exchanger 22 is twice the number of the energy storage heat exchanger 21, and two energy release heat exchangers 22 are arranged between any two adjacent energy storage heat exchangers 21. The energy storage heat exchanger 21 and the energy release heat exchanger 22 are both tube-fin heat exchangers. The energy storage heat exchanger 21 and the energy release heat exchanger 22 are arranged along the first direction. The two opposite ends of the heat exchanger 2 along the second direction are respectively the first end 25 and the second end 26. The first direction and the second direction are perpendicular. The energy release heat exchanger 22 releases energy outward from the second end 26. The heat exchange medium in the energy release heat exchanger 22 flows from the first end 25 to the second end 26, and the heat exchange medium in the energy storage heat exchanger 21 flows from the first end 25 to the second end 26. The energy storage heat exchanger 21 and the energy release heat exchanger 22 both include 16 U-shaped tubes 23 arranged in the second direction, and the distance between two adjacent U-shaped tubes 23 is 15-25 mm; the fins 24 in the energy storage heat exchanger 21 and the energy release heat exchanger 22 are flat plates or window plates, and the distance between two adjacent fins 24 in the energy storage heat exchanger 21 and the energy release heat exchanger 22 is 1-3 mm; the width of the fins 24 in the energy storage heat exchanger 21 and the energy release heat exchanger 22 in the first direction is 12-25 mm, the first end 25 is the lower end, and the second end 26 is the upper end.

[0074] Furthermore, the thermal conductivity enhanced heat storage material is arranged in the box 1, and the thermal conductivity enhanced heat storage material includes a main material, an auxiliary material and a thermal conductivity enhancer, the main material is sodium acetate trihydrate; the auxiliary material includes a nucleating agent, a thickener and a modifier. The nucleating agent includes at least one of borax, nano metals and oxides, and disodium hydrogen phosphate decahydrate, the thickener includes at least one of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide, the modifier includes at least one of formamide, urea, and lithium chloride, and the thermal conductivity enhancer is expanded graphite. In the direction from the first end 25 to the second end 26, the thermal conductivity of the thermal conductivity enhanced heat storage material gradually increases, the density of the thermal conductivity enhanced heat storage material gradually decreases, and the content of the thermal conductivity enhancer gradually increases in a step-by-step manner, from 0-1% to 1-2%.

[0075] Embodiment 2:

[0076] The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the content of the thermal conductivity enhancer increases gradually in a stepwise manner from 1-10% to 10-20% in the direction from the first end 25 to the second end 26 .

[0077] Embodiment three:

[0078] The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the thermal conductivity enhanced heat storage material comprises a first heat storage material and a second heat storage material, the density of the first heat storage material is greater than the density of the second heat storage material, the thermal conductivity of the first heat storage material is less than the thermal conductivity of the second heat storage material, the first heat storage material is arranged on a side close to the first end 25, and the second heat storage material is arranged on a side close to the second end 26.

[0079] Embodiment 4:

[0080] The structure of this embodiment is substantially the same as that of the first embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the heat exchange medium in the energy release heat exchanger 22 flows from the first end 25 to the second end 26 , and the heat exchange medium in the energy storage heat exchanger 21 flows from the second end 26 to the first end 25 .

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An accumulator, characterized in that: include: Box; A heat exchanger, wherein the heat exchanger comprises an energy storage heat exchanger and an energy release heat exchanger, wherein the energy storage heat exchanger and the energy release heat exchanger are arranged along a first direction, and two opposite ends of the heat exchanger along a second direction are respectively a first end and a second end, the first direction is perpendicular to the second direction, and the energy release heat exchanger releases energy outward from the second end; The thermal conductivity enhanced heat storage material is arranged in the box body. In the direction from the first end to the second end, the thermal conductivity of the thermal conductivity enhanced heat storage material gradually increases, and the density of the thermal conductivity enhanced heat storage material gradually decreases.

2. The accumulator according to claim 1, characterized in that The heat exchange medium in the energy-releasing heat exchanger flows from the first end to the second end; and / or, the heat exchange medium in the energy-storing heat exchanger flows from the first end to the second end; and / or, the heat exchange medium in the energy-storing heat exchanger flows from the second end to the first end.

3. The accumulator according to claim 1, characterized in that The thermal conductivity enhanced heat storage material comprises a main material, an auxiliary material and a thermal conductivity enhancer, and the content of the thermal conductivity enhancer gradually increases in the direction from the first end to the second end.

4. The accumulator according to claim 3, characterized in that The main material is sodium acetate trihydrate; And / or, the thermal conductivity enhancer is expanded graphite.

5. The accumulator according to claim 3, characterized in that: The auxiliary materials include nucleating agents, thickeners and modifiers. The nucleating agent includes at least one of borax, nano metals and oxides, and disodium hydrogen phosphate decahydrate; And / or, the thickener includes at least one of xanthan gum, sodium carboxymethyl cellulose, and polyacrylamide; And / or, the modifier includes at least one of formamide, urea, and lithium chloride.

6. The accumulator according to claim 3, characterized in that In the direction from the first end to the second end, the content of the thermal conductivity enhancing agent increases gradually in a step-by-step manner.

7. The accumulator according to claim 1, characterized in that The thermal conductivity enhanced heat storage material includes a first heat storage material and a second heat storage material, the density of the first heat storage material is greater than the density of the second heat storage material, the thermal conductivity of the first heat storage material is less than the thermal conductivity of the second heat storage material, the first heat storage material is arranged on a side close to the first end, and the second heat storage material is arranged on a side close to the second end.

8. The accumulator according to claim 1, characterized in that The energy storage heat exchanger and the energy release heat exchanger are both tube-fin heat exchangers.

9. The accumulator according to claim 8, characterized in that The fins of at least one of the energy storage heat exchanger and the energy release heat exchanger are flat sheets or window sheets.

10. The accumulator according to claim 8, characterized in that At least one of the energy storage heat exchanger and the energy release heat exchanger includes a plurality of U-shaped tubes arranged in the second direction, and the distance between two adjacent U-shaped tubes is 15-25 mm; and / or, the distance between two adjacent fins of at least one of the energy storage heat exchanger and the energy release heat exchanger is 1-3 mm; And / or, a width of a fin of at least one of the energy storage heat exchanger and the energy release heat exchanger in the first direction is 12-25 mm.

11. The accumulator according to claim 1, characterized in that There are multiple energy-releasing heat exchangers and multiple energy-storing heat exchangers, the number of the energy-releasing heat exchangers is twice the number of the energy-storing heat exchangers, and two energy-releasing heat exchangers are arranged between any two adjacent energy-storing heat exchangers.

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