Solar heat collector and solar water heating system

Abstract

The utility model belongs to the technical field of solar water heaters, and particularly relates to a solar heat collector and a solar water heating system. The solar heat collector comprises a heat collecting pipe assembly and a magnetic field generating assembly, the heat collecting pipe assembly is internally provided with magnetic nanofluid, the magnetic field generating assembly is arranged on the heat collecting pipe assembly, and a magnetic field is generated on the heat collecting pipe assembly through the magnetic field generating assembly so that heat exchange of the magnetic nanofluid can be promoted, and the heat exchange performance of the magnetic nanofluid can be improved. Therefore, the heat transfer performance of the solar heat collector can be improved.

Description

Technical Field

[0001] This application relates to the field of solar water heater technology, specifically to a solar collector and a solar water heating system. Background Technology

[0002] Solar water heating systems use solar collectors to collect solar radiation, convert it into heat energy, and transfer the heat energy to a storage tank to heat the water in the tank.

[0003] In existing technology, a solar collector includes a collector tube assembly and an absorber plate, the latter used to absorb solar radiation. The collector tube assembly is connected to a water storage tank, and the heat transfer medium is located inside the collector tube assembly. The heat from the absorber plate is transferred to the water storage tank through the heat transfer medium.

[0004] However, the heat transfer performance of the aforementioned heat transfer media is poor. Utility Model Content

[0005] This application provides a solar collector and a solar water heating system to solve the problem of poor heat transfer performance of the heat transfer medium.

[0006] On the one hand, this application provides a solar collector, comprising:

[0007] A heat collection tube assembly containing magnetic nanofluid;

[0008] A magnetic field generating component is disposed on the heat collection tube assembly and is used to generate a magnetic field on the heat collection tube assembly to promote heat transfer of the magnetic nanofluid.

[0009] In some embodiments, the heat collection tube assembly includes a plurality of parallel spaced-apart branch tubes, the magnetic field nanofluid flows within the branch tubes to exchange heat with the outside of the branch tubes, and the magnetic field generating assembly is disposed around the periphery of the branch tubes.

[0010] In some embodiments, the magnetic field generating component includes at least one electromagnetic coil group, which is correspondingly disposed on the periphery of the branch pipe.

[0011] In some embodiments, the distance between the electromagnetic coil assembly and the liquid inlet end of the branch pipe is 1 / 2 to 5 / 6 of the length of the branch pipe.

[0012] In some embodiments, the electromagnetic coil group includes a first electromagnetic coil and a second electromagnetic coil, which are respectively disposed on opposite sides of the branch pipe. The first electromagnetic coil and the second electromagnetic coil are staggered, and the magnetic field generated by the first electromagnetic coil is opposite to the magnetic field generated by the second electromagnetic coil.

[0013] In some embodiments, both the first electromagnetic coil and the second electromagnetic coil include a core material and a coil wound around the core material, wherein the current direction of the coil in the first electromagnetic coil and the current direction of the coil in the second electromagnetic coil are either clockwise or counterclockwise.

[0014] In some embodiments, the axis of the core material is parallel to the axis of the branch pipe, or the axis of the core material is perpendicular to the axis of the branch pipe.

[0015] In some embodiments, there are multiple electromagnetic coil groups, and each electromagnetic coil group is connected in parallel.

[0016] In some embodiments, the magnetic nanofluid includes a heat transfer medium and magnetic nanoparticles.

[0017] On the other hand, this application provides a solar water heating system, including a water storage tank and any of the aforementioned solar collectors connected to the water storage tank.

[0018] The solar collector and solar water heating system provided in this application include a solar collector comprising a collector tube assembly and a magnetic field generating assembly. Magnetic nanofluid is disposed within the collector tube assembly. The magnetic field generating assembly is disposed on the collector tube assembly and generates a magnetic field on the collector tube assembly. The solar collector provided in this application, by disposing of magnetic nanofluid within the collector tube assembly and by disposing of the magnetic field generating assembly, generates a magnetic field on the collector tube assembly. This magnetic field promotes the heat transfer performance of the magnetic nanofluid, thereby improving the heat transfer performance of the solar collector. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 This is a schematic diagram of the structure of a solar collector provided in an embodiment of this application;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the electromagnetic coil assembly and some branch pipes Figure 1 ;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the electromagnetic coil assembly and some branch pipes Figure 2 ;

[0023] Figure 4This is a schematic diagram of the structure of a partial solar water heating system provided in the embodiments of this application;

[0024] Figure 5 A graph showing the change in heat transfer coefficient at various points on the branch pipe when the magnetic field generating component in the solar collector provided in this application is arranged at the first location.

[0025] Figure 6 A graph showing the change in heat transfer coefficient at various points on the branch pipe when the magnetic field generating component in the solar collector provided in this application is arranged at the second location.

[0026] Figure 7 A graph showing the change in heat transfer coefficient at various points on the branch pipe when the magnetic field generating component in the solar collector provided in this application is arranged at the third location.

[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100-Solar collector;

[0030] 110 - Heat collector tube assembly; 111 - First manifold; 112 - Second manifold; 113 - Branch pipe;

[0031] 120 - Magnetic field generating component; 121 - Electromagnetic coil assembly; 122 - First electromagnetic coil; 123 - Second electromagnetic coil; 124 - Core material; 125 - Coil;

[0032] 130-Magnetic nanoparticles;

[0033] 140 - Inlet pipe;

[0034] 200 - Water storage tank; 300 - First connecting pipe; 400 - Second connecting pipe. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] In existing technologies, solar collectors include a collector tube assembly and an absorber plate, with the absorber plate used to absorb solar radiation. The collector tube assembly is connected to a water storage tank, and the heat transfer medium is located inside the collector tube assembly. Heat from the absorber plate is transferred to the water storage tank through the heat transfer medium. However, the thermal conductivity of the aforementioned heat transfer medium is typically low, resulting in limited heat transfer capacity and poor heat transfer performance, which in turn leads to low solar collector efficiency.

[0037] Based on this, this application provides a solar collector that provides a magnetic nanofluid within the collector tube assembly and a magnetic field generating assembly to generate a magnetic field on the collector tube assembly, thereby promoting heat exchange of the magnetic nanofluid, improving the heat exchange performance of the magnetic nanofluid, and thus improving the heat transfer performance of the solar collector.

[0038] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems will be described in detail below with specific embodiments. These specific embodiments can exist independently or in combination with each other. The embodiments of this application will be described below with reference to the accompanying drawings.

[0039] Reference Figures 1 to 3 The solar collector 100 provided in this application includes a heat collection tube assembly 110 and a magnetic field generating assembly 120. Magnetic nanofluid is disposed within the heat collection tube assembly 110. The magnetic field generating assembly 120 is disposed on the heat collection tube assembly 110 and is used to generate a magnetic field on the heat collection tube assembly 110 to promote heat transfer of the magnetic nanofluid.

[0040] Solar collectors are devices that convert solar energy into thermal energy and are widely used in solar water heating systems, solar water heating systems, and other applications. The main types of solar collectors include flat-plate collectors, evacuated tube collectors, and concentrating collectors. This application uses flat-plate collectors as an example.

[0041] The collector tube assembly 110 is used to communicate with the water storage tank 200 of the solar water heating system, and the magnetic nanofluid flows within the collector tube assembly 110 as a heat transfer medium. Specifically, the solar water heating system also includes a first connecting pipe 300 and a second connecting pipe 400. One end of the collector tube assembly 110 is connected to the water storage tank 200 through the first connecting pipe 300, and the other end of the collector tube assembly 110 is connected to the water storage tank 200 through the second connecting pipe 400. That is, the magnetic nanofluid flows along... Figure 1 and Figure 4 The flow is indicated by the dashed arrow in the image.

[0042] The solar collector 100 also includes a heat absorber, which absorbs solar energy and converts it into heat energy. The heat absorber is located on one side of the collector tube assembly 110. The heat absorber can transfer heat energy to the magnetic nanofluid inside the collector tube assembly 110. After absorbing heat, the magnetic nanofluid enters the water storage tank 200 through the first connecting pipe 300 and exchanges heat with the water in the water storage tank 200 to heat the water in the water storage tank 200. Then, the magnetic nanofluid returns to the collector tube assembly 110 through the second connecting pipe 400 to absorb the heat transferred by the heat absorber again.

[0043] It should be noted that the magnetic nanofluid includes a heat transfer medium and magnetic nanoparticles 130. The magnetic nanoparticles 130 include at least one of cobalt particles (Co) and iron oxide particles (Fe3O4). The heat transfer medium can be water.

[0044] When the magnetic nanofluid flows into the magnetic field within the heat collector tube assembly 110, the magnetic nanoparticles 130 are subjected to the magnetic force of the magnetic field, causing the magnetic nanoparticles 130 to oscillate within the heat collector tube assembly 110, which in turn promotes heat exchange of the magnetic nanofluid within the heat collector tube assembly 110.

[0045] For example, the magnetic nanoparticles include at least one of cobalt particles and iron oxide particles. The magnetic nanoparticles 130 are conductive, and under the action of a magnetic field, the Joule heating generated by the magnetic nanoparticles 130 promotes the heat transfer of the magnetic nanofluid and increases the heat transfer coefficient of the magnetic nanofluid.

[0046] The solar collector 100 provided in this application embodiment provides a magnetic nanofluid in the heat collector tube assembly 110 and a magnetic field generating assembly 120. The magnetic field generating assembly 120 generates a magnetic field on the heat collector tube assembly 110. The magnetic field can promote the heat transfer performance of the magnetic nanofluid, thereby improving the heat transfer performance of the solar collector 100.

[0047] Reference Figure 1 In some embodiments, the heat collection tube assembly 110 includes a plurality of parallel spaced branch tubes 113, in which magnetic nanofluid flows to exchange heat with the outside of the branch tubes 113, and a magnetic field generating assembly 120 is disposed on the periphery of the branch tubes 113.

[0048] The heat collection tube assembly 110 further includes a first manifold 111 and a second manifold 112. A branch pipe 113 has an inlet and an outlet. The first manifold 111 is connected to the inlet of the branch pipe 113, and the second manifold 112 is connected to the outlet of the branch pipe 113. The first manifold 111 is parallel to the second manifold 112, and both the first manifold 111 and the second manifold 112 are perpendicular to the branch pipe 113.

[0049] Specifically, the magnetic nanofluid enters the branch pipe 113 through the first manifold 111 and exchanges heat with the heat absorber in the branch pipe 113. The magnetic field generating component 120 is arranged on the periphery of the branch pipe 113 to improve the heat exchange performance of the magnetic nanofluid in the branch pipe 113.

[0050] In some embodiments, the heat collection tube assembly 110 further includes a liquid inlet pipe 140, which connects the second connecting pipe 400 and the first manifold 111.

[0051] Reference Figure 1 , Figure 2 and Figure 3 In a specific implementation, the magnetic field generating component 120 includes at least one electromagnetic coil group 121, which is correspondingly arranged on the periphery of the branch pipe 113.

[0052] In this process, the magnetic nanofluid flows in the branch pipe 113, so that the magnetic nanofluid and the electromagnetic coil group 121 of the heat exchange component generate a magnetic field on at least part of the periphery of the branch pipe 113 through electromagnetic induction. When the magnetic nanofluid in the branch pipe 113 flows into the magnetic field, the magnetic nanoparticles 130 oscillate under the action of the magnetic field, thereby promoting heat exchange of the magnetic nanofluid.

[0053] In some embodiments, the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 1 / 2 to 5 / 6 of the length of the branch pipe 113.

[0054] Figure 5 , Figure 6 and Figure 7 The graph shows the variation of the local convective heat transfer coefficient h of the magnetic nanofluid (Fe3O4-water nanofluid) with the pipe length under the action of local magnetic fields at three different locations. Figure 5 To establish a local magnetic field 120 mm from the inlet end of branch pipe 113, i.e., when the distance between the electromagnetic coil assembly 121 and the inlet end of branch pipe 113 is 1 / 4 of the length of branch pipe 113, the local convective heat transfer coefficient h of Fe3O4-water nanofluid varies with pipe length under the influence of the local magnetic field. (Refer to...) Figure 5 It can be seen that under the action of a magnetic field, the maximum value of the local convective heat transfer coefficient is obtained at X / D=15, which can be increased by up to 20.5%. Figure 6 To illustrate the variation of the local convective heat transfer coefficient h of the Fe3O4-water nanofluid with pipe length under the influence of a local magnetic field, where a local magnetic field is positioned 240 mm from the inlet end of branch pipe 113 (i.e., the distance between the electromagnetic coil assembly 121 and the inlet end of branch pipe 113 is half the length of branch pipe 113). (Refer to...) Figure 6 It can be seen that under the action of a magnetic field, the maximum value of the local convective heat transfer coefficient is obtained at X / D=25, which can be increased by up to 25.2%. Figure 7 To establish a local magnetic field at a distance of 360 mm from the inlet end of branch pipe 113, i.e., when the distance between the electromagnetic coil assembly 121 and the inlet end of branch pipe 113 is 3 / 4 of the length of branch pipe 113, the local convective heat transfer coefficient h of the Fe3O4-water nanofluid varies with pipe length under the influence of the local magnetic field. (Refer to...) Figure 7 It can be seen that the maximum local convective heat transfer coefficient is obtained at X / D=35, which can be increased by up to 25.4%. Here, X is the length of the pipe and D is the diameter of the pipe.

[0055] In summary, when the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 3 / 4 of the length of the branch pipe 113, the local heat transfer coefficient of the Fe3O4-water nanofluid is relatively large. Therefore, the electromagnetic coil assembly 121 can be set at 3 / 4 of the length of the branch pipe 113.

[0056] Furthermore, if the magnetic nanofluid in the above experiment is Co-water nanofluid, and other conditions remain unchanged, when the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 1 / 4 of the length of the branch pipe 113, the Co-water nanofluid achieves the maximum local convective heat transfer coefficient at X / D=15, which can be increased by up to 22.5%; when the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 1 / 2 of the length of the branch pipe 113, the Co-water nanofluid achieves the maximum local convective heat transfer coefficient at X / D=25, which can be increased by up to 27.1%; when the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 3 / 4 of the length of the branch pipe 113, the Co-water nanofluid achieves the maximum local convective heat transfer coefficient at X / D=35, which can be increased by up to 27.6%. Therefore, it can be seen that when the distance between the electromagnetic coil assembly 121 and the liquid inlet end of the branch pipe 113 is 3 / 4 of the length of the branch pipe 113, the local heat transfer coefficient of the Co-water nanofluid is relatively large.

[0057] Reference Figure 5 , Figure 6 and Figure 7 It can be seen that when the magnetic nanofluid enters the branch pipe 113 and flows in the region of the branch pipe 113 without the influence of a magnetic field, the local convective heat transfer coefficient of the magnetic nanofluid gradually decreases along the axial direction of the branch pipe 113, and decreases again when it approaches the region of the magnetic field influence of the electromagnetic coil assembly 121. After the magnetic nanofluid moves away from the region of the magnetic field influence, the convective heat transfer coefficient of the magnetic nanofluid increases rapidly.

[0058] Reference Figure 5 , Figure 6 and Figure 7 It can be seen that the greater the magnetic field strength, the greater the local convective heat transfer coefficient of the magnetic nanofluid, and the better the heat transfer performance of the magnetic nanofluid.

[0059] Reference Figure 2 and Figure 3 In some embodiments, the electromagnetic coil group 121 includes a first electromagnetic coil 122 and a second electromagnetic coil 123. The first electromagnetic coil 122 and the second electromagnetic coil 123 are respectively located on opposite sides of the branch pipe 113. The first electromagnetic coil 122 and the second electromagnetic coil 123 are arranged in a staggered manner, and the magnetic field generated by the first electromagnetic coil 122 is opposite to the magnetic field generated by the second electromagnetic coil 123.

[0060] The distance between the first electromagnetic coil 122 and the liquid inlet end of the branch pipe 113 is different from the distance between the second electromagnetic coil 123 and the liquid inlet end of the branch pipe 113, so that the first electromagnetic coil 122 and the second electromagnetic coil 123 are arranged in a staggered manner.

[0061] For example, the distance between the first electromagnetic coil 122 and the liquid inlet end of the branch pipe 113 is less than the distance between the second electromagnetic coil 123 and the liquid inlet end of the branch pipe 113.

[0062] Reference Figure 2 The magnetic field generated by the first electromagnetic coil 122 has its N pole at the bottom and its S pole at the top. Magnetic nanoparticles 130 within the magnetic field range of the first electromagnetic coil 122 will experience a magnetic force F1 directed towards the upper left. The direction of the magnetic force F1 is the same as the flow direction of the magnetic nanoparticles 130 within the branch pipe 113, so that the magnetic force F1 can provide a driving force for the magnetic nanoparticles 130 and reduce the viscous resistance during flow. The magnetic field generated by the second electromagnetic coil 123 has its N pole at the top and its S pole at the bottom. Magnetic nanoparticles 130 within the magnetic field range of the second electromagnetic coil 123 will experience a magnetic force F2 directed towards the lower right. The magnetic forces F1 from the first electromagnetic coil 122 and F2 from the second electromagnetic coil 123 experienced by the magnetic nanoparticles 130 are opposite in direction, so that the magnetic nanoparticles 130 can exhibit an oscillating motion tendency within the branch pipe 113, thereby promoting heat exchange in the magnetic nanofluid.

[0063] Reference Figure 3 The magnetic field generated by the first electromagnetic coil 122 has its N pole on the left and its S pole on the right. Magnetic nanoparticles 130 within the magnetic field range generated by the first electromagnetic coil 122 will experience a magnetic force F1 directed to the right. Similarly, the magnetic field generated by the second electromagnetic coil 123 has its N pole on the right and its S pole on the left. Magnetic nanoparticles 130 within the magnetic field range generated by the second electromagnetic coil 123 will experience a magnetic force F2 directed to the right. The magnetic forces F1 and F2 experienced by the magnetic nanoparticles 130 by the first electromagnetic coil 122 and the second electromagnetic coil 123 are in opposite directions.

[0064] In this way, the first electromagnetic coil 122 and the second electromagnetic coil 123 can jointly generate a magnetic field similar to an alternating magnetic field. Simultaneously, when the magnetic nanofluid flows within the magnetic field, the magnetic nanoparticles 130 are subjected to Lorentz and Kelvin forces, causing them to deflect and thus increasing the local concentration of magnetic nanoparticles 130 and thinning the edge layer, thereby enhancing the local heat transfer capacity of the magnetic nanofluid. Furthermore, the magnetic nanoparticles 130 become magnetized under the influence of the magnetic field, forming chain-like heat transfer channels on the wall of the branch pipe 113, further enhancing the local heat transfer performance of the magnetic nanofluid. The magnetic field also improves the stability of the magnetic nanofluid and reduces sedimentation.

[0065] In this embodiment, an alternating current is not required to be applied to the electromagnetic coil group 121 to generate a magnetic field with the same effect as an alternating magnetic field, and the structure is relatively simple.

[0066] In some examples, the first electromagnetic coil 122 and the second electromagnetic coil 123 may be attached to the outer wall of the branch pipe 113.

[0067] Reference Figure 2 and Figure 3 In a specific implementation, both the first electromagnetic coil 122 and the second electromagnetic coil 123 include a core material 124 and a coil 125 wound around the core material 124. The current direction of the coil 125 of the first electromagnetic coil 122 and the current direction of the coil 125 of the second electromagnetic coil 123 are either clockwise or counterclockwise.

[0068] A coil 125 is formed by winding wires around the core material 124. The wires are connected to the positive and negative terminals of a power source so that current flows through the coil 125.

[0069] For example, the core material 124 can be an iron core.

[0070] In the embodiments of this application, the coil 125 of the first electromagnetic coil 122 and the coil 125 of the second electromagnetic coil 123 are connected in series.

[0071] By adjusting the current direction of the coil 125 of the first electromagnetic coil 122 to be clockwise and the current direction of the coil 125 of the second electromagnetic coil 123 to be counterclockwise, the direction of the magnetic field generated by the first electromagnetic coil 122 is opposite to the direction of the magnetic field generated by the second electromagnetic coil 123. This causes the magnetic force exerted on the magnetic nanoparticle 130 by the first electromagnetic coil 122 to be opposite to the direction of the magnetic force exerted by the second electromagnetic coil 123, thereby causing the magnetic nanoparticle 130 to exhibit an oscillating motion tendency.

[0072] Specifically, the strength of the magnetic field generated by the first electromagnetic coil 122 and the second electromagnetic coil 123 can be calculated using the following formula: .

[0073] Where B is the magnetic field strength (Tesla, T); μ0 is the free permeability. n is the number of turns per unit length of coil 125 (turns / meter); I is the current flowing through coil 125 (amperes, A).

[0074] The number of turns per unit length of coil (125) can be calculated using the following formula: Where N is the number of turns of coil 125; L is the length of coil 125.

[0075] In summary, the magnetic field strength B generated by the first electromagnetic coil 122 and the second electromagnetic coil 123 can also be calculated using the following formula: Therefore, the magnetic field strength can be adjusted by changing the current in coil 125 and the number of turns in coil 125.

[0076] For example, the magnetic field strength can be 30 Gs. Furthermore, when the magnetic field is 30 Gs, coil 125 uses enameled wire, and examples of voltage, current, and other parameters within coil 125 are as follows:

[0077] The voltage is 5V; the cross-sectional area of ​​coil 125 is 1cm²; the length of coil 125 is 0.1m; the resistance of coil 125 is 1 ohm; therefore, the number of turns of coil 125 is approximately 1592 turns; the current in coil 125 is 5A.

[0078] Alternatively, the voltage is 12 V; the cross-sectional area of ​​coil 125 is 1 cm²; the length of coil 125 is 0.1 m; the resistance of coil 125 is 1 ohm; the number of turns of coil 125 is approximately 200; and the current in coil 125 is 12 A.

[0079] Alternatively, the voltage is 300 V; the cross-sectional area of ​​coil 125 is 1 cm²; the length of coil 125 is 0.1 m; the resistance of coil 125 is 100 ohms; the number of turns of coil 125 is approximately 11; and the current in coil 125 is 2.2 A.

[0080] Reference Figure 2 and Figure 3 In practice, the axis of the core material 124 is parallel to the axis of the branch pipe 113, or the axis of the core material 124 is perpendicular to the axis of the branch pipe 113.

[0081] For example, refer to Figure 2The axis of the core material 124 is parallel to the branch pipe 113. The distance between the first electromagnetic coil 122 and the second manifold 112 is less than the distance between the second electromagnetic coil 123 and the second manifold 112. The N pole of the magnetic field generated by the first electromagnetic coil 122 faces upward, and the S pole of the magnetic field generated by the second electromagnetic coil 123 faces upward.

[0082] Reference Figure 3 The axis of the core material 124 is perpendicular to the branch pipe 113, and the N pole of the magnetic field generated by the first electromagnetic coil 122 and the N pole of the magnetic field generated by the second electromagnetic coil 123 are both facing the branch pipe 113.

[0083] It should be noted that when the magnetic field force is perpendicular to the axis of branch pipe 113, the flow direction of the magnetic nanofluid will deflect towards the direction of the magnetic field, resulting in an increase in the local flow velocity at the top of the pipe. As the magnetic field strength increases, the deflection angle of the magnetic nanofluid's flow direction increases. When the magnetic field strength reaches a certain level, a reflux region will be formed at the bottom of the pipe, improving the heat transfer performance of the magnetic nanofluid.

[0084] Reference Figure 1 In practice, there are multiple electromagnetic coil groups 121, and each electromagnetic coil group 121 is connected in parallel.

[0085] For example, the magnetic field generating assembly 120 also includes a low-voltage power connector, a positive power line and a negative power line. The positive power line is connected to one end of each electromagnetic coil group 121 in sequence, and the negative power line is connected to the other end of each electromagnetic coil group 121 in sequence, so as to provide power to the electromagnetic coil group 121.

[0086] This reduces the length of the wires used, thus saving wires.

[0087] In some examples, the negative wire in the electromagnetic coil assembly 121 can be connected to the branch pipe 113 to form a negative "ground," thereby reducing the length of the wire used and saving wire. Furthermore, the negative wire in the electromagnetic coil assembly 121 can be soldered to the branch pipe 113.

[0088] Reference Figure 4 Based on the above embodiments, this application provides a solar water heating system, including a water storage tank 200 and any of the above-mentioned solar collectors 100 connected to the water storage tank 200.

[0089] The specific structure of the solar collector 100 has been described in detail in the above embodiments and will not be repeated here.

[0090] The solar water heating system provided in this application embodiment includes a solar collector 100 that incorporates a magnetic nanofluid within a collector tube assembly 110 and a magnetic field generating assembly 120. The magnetic field generating assembly 120 generates a magnetic field on the collector tube assembly 110 to promote heat exchange of the magnetic nanofluid, thereby improving the heat exchange performance of the magnetic nanofluid and ultimately enhancing the heat transfer performance of the solar collector 100.

[0091] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this application according to the specific circumstances.

[0092] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0093] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0094] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0095] Unless otherwise stated, the term "multiple" means two or more.

[0096] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A solar collector, characterized in that, include: A heat collection tube assembly (110) having a magnetic nanofluid inside; A magnetic field generating component (120) is disposed on the heat collection tube assembly (110) and is used to generate a magnetic field on the heat collection tube assembly (110) to promote heat transfer of the magnetic nanofluid.

2. The solar collector according to claim 1, characterized in that, The heat collection tube assembly (110) includes a plurality of parallel spaced branch tubes (113), the magnetic nanofluid flows in the branch tubes (113) to exchange heat with the outside of the branch tubes (113), and the magnetic field generating assembly (120) is disposed on the periphery of the branch tubes (113).

3. The solar collector according to claim 2, characterized in that, The magnetic field generating assembly (120) includes at least one electromagnetic coil group (121), which is correspondingly arranged on the periphery of the branch pipe (113).

4. The solar collector according to claim 3, characterized in that, The distance between the electromagnetic coil group (121) and the liquid inlet end of the branch pipe (113) is 1 / 2 to 5 / 6 of the length of the branch pipe (113).

5. The solar collector according to claim 3, characterized in that, The electromagnetic coil group (121) includes a first electromagnetic coil (122) and a second electromagnetic coil (123). The first electromagnetic coil (122) and the second electromagnetic coil (123) are respectively arranged on opposite sides of the branch pipe (113). The first electromagnetic coil (122) and the second electromagnetic coil (123) are arranged in a staggered manner. The direction of the magnetic field generated by the first electromagnetic coil (122) is opposite to the direction of the magnetic field generated by the second electromagnetic coil (123).

6. The solar collector according to claim 5, characterized in that, Both the first electromagnetic coil (122) and the second electromagnetic coil (123) include a core material (124) and a coil (125) wound around the core material (124). The current direction of the coil (125) of the first electromagnetic coil (122) and the current direction of the coil (125) of the second electromagnetic coil (123) are either clockwise or counterclockwise.

7. The solar collector according to claim 6, characterized in that, The axis of the core material (124) is parallel to the axis of the branch pipe (113), or the axis of the core material (124) is perpendicular to the axis of the branch pipe (113).

8. The solar collector according to claim 3, characterized in that, There are multiple electromagnetic coil groups (121), and each electromagnetic coil group (121) is connected in parallel.

9. The solar collector according to any one of claims 1-8, characterized in that, The magnetic nanofluid comprises a heat transfer medium and magnetic nanoparticles (130).

10. A solar water heating system, characterized in that, Includes a water storage tank (200) and a solar collector (100) as described in any one of claims 1-9 connected to the water storage tank (200).

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