A solar thermal storage and heating device based on linear Fresnel lens

Abstract

The present invention discloses a solar thermal storage and heating device based on a linear Fresnel lens, comprising a photovoltaic assembly, a heat storage tank, a linear Fresnel lens photothermal assembly, a pump, a storage battery, a three-way valve 1, a three-way valve 2, a stop valve and a housing; the photovoltaic assembly is electrically connected to the pump and the storage battery respectively; the linear Fresnel lens photothermal assembly is rotatably installed in the housing; the outlet of the pump is respectively connected to the inlet of the linear Fresnel lens photothermal assembly and the inlet of the branch pipe; the outlet of the branch pipe is connected to the lower port of the heat storage tank; a stop valve is arranged on the branch pipe; the outlet of the linear Fresnel lens photothermal assembly is respectively connected to the upper port of the heat storage tank and the inlet on the user side through the three-way valve 2; the inlet of the pump is respectively connected to the outlet on the user side and the lower port of the heat storage tank through the three-way valve 1. The present invention designs two corrosion-resistant heat-conducting pipes with different settings and phase-change materials with different phase change temperatures inside, which can store heat at different temperatures and realize gradient heat storage.

Description

Technical Field

[0001] The invention relates to a solar energy heating system, in particular to a solar energy heat storage and heating device based on a linear Fresnel lens. Background Art

[0002] Among all energy sources, solar energy has attracted widespread attention due to its cleanliness and inexhaustibility. The cost of photothermal conversion is low, and the cost of heat preservation is much lower than the cost of electricity. However, when photothermal conversion technology is applied to actual heating, there are the following problems: First, there is insufficient heat when heat is needed in winter, but it is sufficient when heat is not needed in summer; second, if there are continuous cloudy or rainy days in winter, the heat supply is insufficient; third, the response speed of heating is slow; fourth, the current heating products are non-standard products.

[0003] Linear Fresnel lens is a lens that converges sunlight into long light spots, which can better gather the heat energy of sunlight. The invention application with application number 202010093127.8 discloses a solar water heating system that efficiently solves the heating problem of rural buildings, but it requires an external power supply, and there is no multi-temperature phase change material inside the water tank, and the pipeline system has not been further optimized to achieve the effect of storing first and releasing first. Therefore, the advantages of linear Fresnel lenses should be combined to develop a solar heat storage and heating device to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a solar thermal storage and heating device based on a linear Fresnel lens.

[0005] The technical solution of the present invention to solve the technical problem is to provide a solar thermal storage and heating device based on a linear Fresnel lens, characterized in that the device includes a photovoltaic module, a heat storage tank, a linear Fresnel lens photothermal module, a pump, a battery, a three-way valve 1, a three-way valve 2, a stop valve and a housing;

[0006] The heat storage tank comprises a heat insulation layer, an upper port, a guide plate, a first corrosion-resistant heat-conducting pipe, a second corrosion-resistant heat-conducting pipe, a lower port and a heat storage tank shell;

[0007] The outer side of the heat storage tank shell is coated with an insulation layer, and the insulation layer completely covers the heat storage tank shell; N guide plates are vertically fixed inside the heat storage tank shell, and the upper end and the lower end are respectively fixedly connected to the upper end and the lower end of the inner wall of the heat storage tank shell, and one of the left end or the right end is fixedly connected to the inner wall of the heat storage tank shell and the connection modes of two adjacent guide plates are different, so that the heat storage tank shell is divided into N interconnected flow areas along the length direction or the width direction to form an integral flow channel; the heat storage tank shell is provided with an upper port and a lower port for the flow in and out of the working medium; the upper port and the lower port are respectively located at the beginning and the end of the integral flow channel; a first corrosion-resistant heat-conducting pipe is vertically arranged in each flow area; a second corrosion-resistant heat-conducting pipe is horizontally arranged in the flow area with the upper port; the interior of the first corrosion-resistant heat-conducting pipe is filled with a first phase change material, and the interior of the second corrosion-resistant heat-conducting pipe is filled with a second phase change material; the phase change temperature of the first phase change material is greater than the phase change temperature of the second phase change material;

[0008] The photovoltaic assembly is arranged on the outer surface of the housing and is electrically connected to the pump and the battery respectively; the linear Fresnel lens photothermal assembly is rotatably installed in the housing, and when in use, the position is adjusted according to the solar altitude angle to achieve optimal sunlight irradiation; the outlet of the pump is respectively connected to the inlet of the linear Fresnel lens photothermal assembly and the inlet of the branch pipe; the outlet of the branch pipe is connected to the lower port of the heat storage tank; a stop valve is arranged on the branch pipe; the outlet of the linear Fresnel lens photothermal assembly is respectively connected to the upper port of the heat storage tank and the inlet on the user side through the three-way valve 2; the inlet of the pump is respectively connected to the outlet on the user side and the lower port of the heat storage tank through the three-way valve 1;

[0009] The device has three operating modes:

[0010] Mode 1: The linear Fresnel lens photothermal component supplies heat to the heat storage tank: the stop valve is closed, the three-way valve 1 connects the lower port to the pump inlet, and the three-way valve 2 connects the outlet of the linear Fresnel lens photothermal component to the upper port; the working fluid is heated by the linear Fresnel lens photothermal component under the action of the pump, flows through the three-way valve 2 to reach the heat storage tank, and flows into the heat storage tank from the upper port, first heating the second corrosion-resistant heat-conducting pipe to make the second phase-change material inside it absorb heat and melt, storing energy, and then heating the first corrosion-resistant heat-conducting pipe to make the first phase-change material inside it absorb heat and melt, storing energy, and then flowing out from the lower port and returning to the pump through the three-way valve 1;

[0011] Mode 2: The linear Fresnel lens photothermal component supplies heat to the user side: the stop valve is closed, the three-way valve 1 connects the outlet of the user side with the inlet of the pump, and the three-way valve 2 connects the outlet of the linear Fresnel lens photothermal component with the inlet of the user side; the working fluid flows through the linear Fresnel lens photothermal component under the action of the pump to be heated, flows through the three-way valve 2 to reach the user side, and then returns to the pump through the three-way valve 1;

[0012] Mode 3, the heat storage tank supplies heat to the user side: the stop valve is opened, the three-way valve 1 connects the pump inlet and the user side outlet, and the three-way valve 2 connects the upper port and the user side inlet; the working medium flows through the branch pipe under the action of the pump, and enters the interior of the heat storage tank from the lower port of the heat storage tank, and the working medium is first heated by the first corrosion-resistant heat-conducting pipe; when the heat stored in the first corrosion-resistant heat-conducting pipe is released, the working medium is heated by the second corrosion-resistant heat-conducting pipe; then the heated working medium flows out from the upper port of the heat storage tank, passes through the three-way valve 2 to reach the user side, and returns to the pump through the three-way valve 1 after releasing the heat.

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

[0014] (1) The present invention designs two corrosion-resistant heat-conducting pipes with different settings and phase change materials with different phase change temperatures inside, which can store heat at different temperatures. When solar energy is insufficient, the phase change material can also store thermal energy to achieve gradient heat storage; and the second corrosion-resistant heat-conducting pipe is closer to the upper port, and can also release a certain amount of heat when solar energy is insufficient.

[0015] (2) The heat storage tank of the present invention is divided into a plurality of interconnected flow areas. This flow channel design enables the working fluid to fully contact with the corrosion-resistant heat-conducting pipe and prevents the high-temperature working fluid from effectively exchanging heat with the low-temperature working fluid.

[0016] (3) The upper port and the lower port of the heat storage box of the present invention are arranged to be one high and one low, so that the high-temperature working medium is in the upper part and the low-temperature working medium is in the lower part. With the three-way valve and the flow channel design, the effect of storing first and releasing first can be achieved, and the hot working medium can be quickly delivered into the room when the user needs heat.

[0017] (4) The linear Fresnel lens photothermal assembly of the present invention is connected by a hinge, and can be adjusted according to the solar altitude angle. The linear Fresnel lens is used to concentrate heat onto the vacuum tube to heat the working medium, thereby achieving a better heat collection effect. When transported or not in use, the linear Fresnel lens photothermal assembly is located in the outer casing, which is convenient for transportation and storage.

[0018] (5) The present invention can greatly improve the heat absorption effect by providing at least three vacuum tubes, and the maximum heat absorption area can reach the area of ​​a linear Fresnel lens.

[0019] (6) The present invention can be used as a modular device and multiple devices can be set according to user conditions to meet different requirements during actual use, and has a wide range of applications.

[0020] (7) The present invention can provide heating to users without an external power source.

[0021] (8) The present invention adapts to different environmental conditions through three different operating modes, while meeting the indoor heating needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a left side schematic diagram of the overall structure of the present invention;

[0024] Figure 3 It is a right side schematic diagram of the overall structure of the present invention;

[0025] Figure 4 is a schematic top view of the heat storage box of the present invention;

[0026] Figure 5 It is a three-dimensional schematic diagram of the corrosion-resistant heat-conducting pipe in the heat storage box of the present invention;

[0027] Figure 6 It is the heat supply principle diagram of the present invention;

[0028] Figure 7 This is a schematic diagram of the power supply principle of the photovoltaic module of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the vacuum tube of the present invention.

[0030] In the figure, photovoltaic module 1, heat storage tank 2, linear Fresnel lens photothermal module 3, pump 4, battery 5, user side 6, three-way valve 1 7, three-way valve 2 8, stop valve 9, housing 10, branch pipe 101;

[0031] Photovoltaic panel 11, first DC / DC converter 12, second DC / DC converter 13;

[0032] Insulation layer 21, upper port 22, guide plate 23, first corrosion-resistant heat-conducting pipe 24, second corrosion-resistant heat-conducting pipe 25, lower port 26, heat storage tank shell 27;

[0033] Linear Fresnel lens 31, reflector 32, vacuum tube 33, slot reflector 34;

[0034] Outer circular tube 331 , inner circular tube 332 , arc-shaped connecting surface 333 . DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the claims of the present invention.

[0036] The present invention provides a solar thermal storage and heating device based on a linear Fresnel lens (hereinafter referred to as the device), characterized in that the device comprises a photovoltaic module 1, a heat storage tank 2, a linear Fresnel lens photothermal module 3, a pump 4, a storage battery 5, a three-way valve 1 7, a three-way valve 2 8, a stop valve 9 and a housing 10;

[0037] The heat storage tank 2 includes a heat insulation layer 21, an upper port 22, a guide plate 23, a first corrosion-resistant heat-conducting pipe 24, a second corrosion-resistant heat-conducting pipe 25, a lower port 26 and a heat storage tank shell 27;

[0038] The outer side of the heat storage tank shell 27 is coated with an insulation layer 21, and the insulation layer 21 completely covers the heat storage tank shell 27. Since the temperature of the heat storage tank 2 will be higher than the ambient temperature when storing heat, the insulation layer 21 is used to reduce the heat transfer between the heat storage tank 2 and the environment, thereby achieving the effect of heat preservation; N-1 guide plates 23 are vertically fixed to the inside of the heat storage tank shell 27, and the upper and lower ends are respectively fixedly connected to the upper and lower ends of the inner wall of the heat storage tank shell 27, and one of the left end or the right end is fixedly connected to the inner wall of the heat storage tank shell 27, and the connection methods of the two adjacent guide plates 23 are different, and the connection methods of the guide plates 23 separated by one are the same (that is, the left end of a guide plate 23 is fixedly connected to the left inner wall of the heat storage tank shell 27, and the two guide plates 23 adjacent to the guide plate 23 are both fixedly connected to the right inner wall of the heat storage tank shell 27 at the right ends. ), the heat storage tank shell 27 is divided into N interconnected flow areas along the length direction or width direction (not the height direction, i.e., not the Z direction) to form a curved overall flow channel, so that the working fluid flows along the S-shape to each position inside the heat storage tank shell 27; the heat storage tank shell 27 is provided with an upper port 22 and a lower port 26 for the flow in and out of the working fluid; the upper port 22 and the lower port 26 are respectively located at the beginning and the end of the overall flow channel; a first corrosion-resistant heat-conducting pipe 24 is vertically arranged in each flow area of ​​the overall flow channel; a second corrosion-resistant heat-conducting pipe 25 is also horizontally arranged in the flow area with the upper port 22; the interior of the first corrosion-resistant heat-conducting pipe 24 is filled with a first phase change material, and the interior of the second corrosion-resistant heat-conducting pipe 25 is filled with a second phase change material; the phase change temperature of the first phase change material is greater than the phase change temperature of the second phase change material;

[0039] The photovoltaic assembly 1 is arranged on the outer surface of the housing 10, and is electrically connected to the pump 4 and the battery 5 respectively, and is used to supply power to the pump 4 and the battery 5; when the photovoltaic assembly 1 cannot work normally, the battery 5 supplies power to the pump 4; the linear Fresnel lens photothermal assembly 3 is rotatably installed in the housing 10 through a hinge. When in use, the linear Fresnel lens photothermal assembly 3 rotates around the central axis of the hinge, and is fixed in position when it rotates to the optimal sunlight incident angle, so as to adjust the position according to the solar altitude angle to achieve the best sunlight irradiation (in this embodiment, the optimal sunlight incident angle is the latitude value of the location of the device plus 23.6°), which is used to absorb Solar energy is used to heat the working medium inside; when transported or not in use, the linear Fresnel lens photothermal assembly 3 is located in the housing 10, which is convenient for transportation and storage; the outlet of the pump 4 is respectively connected to the inlet of the linear Fresnel lens photothermal assembly 3 and the inlet of the branch pipe 101; the outlet of the branch pipe 101 is connected to the lower port 26 of the heat storage tank 2; a stop valve 9 is provided on the branch pipe 101; the outlet of the linear Fresnel lens photothermal assembly 3 is respectively connected to the upper port 22 of the heat storage tank 2 and the inlet of the user side 6 through the three-way valve 2 8; the inlet of the pump 4 is respectively connected to the outlet of the user side 6 and the lower port 26 of the heat storage tank 2 through the three-way valve 1 7;

[0040] According to the structure of the heat storage tank 2 and the phase change temperature of the phase change material, the device has three operating modes:

[0041] Mode 1, the linear Fresnel lens photothermal component 3 supplies heat to the heat storage tank 2: the stop valve 9 is closed, the three-way valve 1 7 conducts the lower port 26 and the inlet of the pump 4, and the three-way valve 2 8 conducts the outlet of the linear Fresnel lens photothermal component 3 and the upper port 22; the working fluid is heated by the linear Fresnel lens photothermal component 3 under the action of the pump 4, flows through the three-way valve 2 8 to reach the heat storage tank 2, and flows into the interior of the heat storage tank 2 from the upper port 22, first heating the second corrosion-resistant heat-conducting pipe 25 so that the second phase-change material inside it absorbs heat and melts to store energy, and then heating the first corrosion-resistant heat-conducting pipe 24 so that the first phase-change material inside it absorbs heat and melts to store energy, and then flows out from the lower port 26 and returns to the pump 4 through the three-way valve 1 7; due to the density difference between the hot working fluid and the cold working fluid and the internal flow channel design of the heat storage tank 2, the hot working fluid of the heat storage tank 2 can be ensured to be close to the upper port 22;

[0042] Mode 2: The linear Fresnel lens photothermal assembly 3 supplies heat to the user side 6: the stop valve 9 is closed, the three-way valve 1 7 connects the outlet of the user side 6 and the inlet of the pump 4, and the three-way valve 2 8 connects the outlet of the linear Fresnel lens photothermal assembly 3 and the inlet of the user side 6; the working fluid flows through the linear Fresnel lens photothermal assembly 3 under the action of the pump 4 to be heated, flows through the three-way valve 2 8 to reach the user side 6, and then returns to the pump 4 through the three-way valve 1 7;

[0043] Mode three, the heat storage tank 2 supplies heat to the user side 6: the stop valve 9 is opened, the three-way valve 1 7 conducts the way between the inlet of the pump 4 and the outlet of the user side 6, and the three-way valve 2 8 conducts the way between the upper port 22 and the inlet of the user side 6; the working medium flows through the branch pipe 101 under the action of the pump 4, and enters the interior of the heat storage tank 2 from the lower port 26 of the heat storage tank 2, and the working medium is first heated by the first corrosion-resistant heat-conducting pipe 24; when the heat stored in the first corrosion-resistant heat-conducting pipe 24 is completely released, the working medium is heated by the second corrosion-resistant heat-conducting pipe 25; then the heated working medium flows out from the upper port 22 of the heat storage tank 2, passes through the three-way valve 2 8 to reach the user side 6, and returns to the pump 4 through the three-way valve 1 7 after releasing the heat.

[0044] Preferably, in the first mode, since the working fluid with a higher temperature is closer to the upper port 22, when the temperature of the working fluid is not enough to melt the first phase change material in the first corrosion-resistant heat-conducting pipe 24 and can melt the second phase change material in the second corrosion-resistant heat-conducting pipe 25, the effect of storing low-temperature heat can be achieved. In the third mode, the working fluid with a higher temperature can be sent to the user side 6, thereby achieving a rapid heating effect.

[0045] Preferably, the interior of the first corrosion-resistant heat-conducting pipe 24 is filled with a first phase-change material, and the interior of the second corrosion-resistant heat-conducting pipe 25 is filled with a second phase-change material.

[0046] Preferably, the phase change temperature of the first phase change material is ≥55°C, such as palmitic acid. The phase change temperature of the second phase change material is 35°C≤phase change temperature<55°C, such as lauric acid.

[0047] Preferably, after the working fluid passes through the linear Fresnel lens photothermal assembly 3, there are three situations:

[0048] Case 1: When the temperature of the working fluid heated by the linear Fresnel lens photothermal assembly 3 by solar energy is ≥55°C, the working fluid flows back to the heat storage tank 2 after being heated by the vacuum tube 33, and the phase change materials inside the first corrosion-resistant heat-conducting pipe 24 and the second corrosion-resistant heat-conducting pipe 25 both undergo phase change. After the two phase change materials melt, they can store a large amount of heat, effectively reducing the volume of the heat storage tank 2;

[0049] The second type is that when the temperature of the working fluid after the linear Fresnel lens thermal assembly 3 is heated by solar energy and is 35°C≤working fluid temperature<55°C, the working fluid is heated through the vacuum tube 33 and flows back to the heat storage tank 2. At this time, the working fluid temperature cannot melt the first phase change material in the first corrosion-resistant heat-conducting pipe 24, and the first phase change material does not undergo phase change, so the first phase change material cannot function; but the phase change temperature of the second phase change material in the second corrosion-resistant heat-conducting pipe 25 is low and can be melted, and the second phase change material undergoes phase change, thereby being used to store heat.

[0050] The third type is that when the temperature of the working medium heated by the linear Fresnel lens photothermal assembly 3 is less than 35° C., the linear Fresnel lens photothermal assembly 3 stops operating. If the user side 6 needs heating at this time, the working medium in the heat storage tank 2 is transported to the user side 6 .

[0051] Preferably, the upper port 22 is located at the upper half of the heat storage tank shell 27, corresponding to the hot working medium; the lower port 26 is located at the lower half of the heat storage tank shell 27, corresponding to the cold working medium.

[0052] Preferably, the total number of the first corrosion-resistant heat-conducting pipes 24 in the heat storage tank 2 is ≥15. The total number of the second corrosion-resistant heat-conducting pipes 25 in the heat storage tank 2 is ≥3, and the second corrosion-resistant heat-conducting pipes 25 are placed in the upper half of the flow area closest to the upper port 22. The number of the first corrosion-resistant heat-conducting pipes 24 arranged in each flow area of ​​the overall flow channel is the same, and the first corrosion-resistant heat-conducting pipes 24 are evenly arranged. In this embodiment, the two guide plates 23 evenly set three flow areas in the heat storage tank 2, and the number of the first corrosion-resistant heat-conducting pipes 24 in each flow area is 10.

[0053] Preferably, the first corrosion-resistant heat-conducting pipe 24 and the second corrosion-resistant heat-conducting pipe 25 are both made of copper, because copper is corrosion-resistant and has good heat-conducting effect.

[0054] Preferably, the photovoltaic assembly 1 includes a photovoltaic panel 11 and a first DC / DC converter 12 and a second DC / DC converter 13; the photovoltaic panel 11 is arranged on the outer surface of the housing 10, facing due south, and is used to absorb solar energy and convert it into electrical energy; the photovoltaic panel 11 is electrically connected to the first DC / DC converter 12; the first DC / DC converter 12 is electrically connected to the pump 4 and the second DC / DC converter 13 respectively; the second DC / DC converter 13 is electrically connected to the battery 5. The electrical energy generated by the photovoltaic panel 11 is divided into two paths after voltage regulation (i.e., boost or buck) by the first DC / DC converter 12, one path is charged into the battery 5 after voltage regulation by the second DC / DC converter 13, and the other path directly supplies power to the pump 4. When there is light, the photovoltaic assembly 1 supplies power to the battery 5 and the pump 4 at the same time; the photovoltaic assembly 1 supplies power to the pump 4 first, and when there is surplus power, the surplus power is charged into the battery 5. When there is no light, the pump 4 still needs to work. At this time, the battery 5 releases electric energy, which is then regulated by the second DC / DC converter 13 to supply power to the pump 4 .

[0055] Preferably, the linear Fresnel lens photothermal assembly 3 comprises a linear Fresnel lens 31, a reflecting plate 32, a vacuum tube 33 and a trough-type reflector 34; the reflecting plate 32 forms four walls, the linear Fresnel lens 31 is placed at the top, facing the sunlight, and the trough-type reflector 34 is placed at the bottom, forming an illumination space; the vacuum tube 33 is placed in the illumination space, facing the long light spot formed by the sunlight after passing through the linear Fresnel lens 31; since the linear Fresnel lens photothermal assembly 3 is a rotatable assembly as a whole, the two ends of the vacuum tube 33 are respectively connected to the outlet of the pump 4 and the three-way valve 28 through a hose; a sealing ring is provided at the connection between the vacuum tube 33 and the hose; when heat collection is required, the sunlight passes through the linear Fresnel lens 31 and converges into a long light spot to illuminate the vacuum tube 33, and the sunlight diffusely reflected by impurities in the illumination space is scattered to the reflecting plate 32 and the trough-type reflector 34 and then absorbed by the vacuum tube 33, thereby making full use of solar energy.

[0056] Preferably, the linear Fresnel lens 31 is made of polyolefin or glass.

[0057] Preferably, due to the change of seasons, the solar altitude angle will gradually change. In addition, during the production process, the machining accuracy of the linear Fresnel lens 31 is insufficient, or due to the large material area and the influence of gravity, the sunlight will deviate from the theoretical design when passing through the linear Fresnel lens 31. Therefore, the number of vacuum tubes 33 is an odd number ≥ 3. When the working fluid flow is distributed in the vacuum tube, the flow of the middle vacuum tube is the largest, and the flow gradually decreases to both sides, so as to better absorb solar energy. Multiple vacuum tubes 33 are set to improve the heat absorption effect.

[0058] Preferably, the number of the reflective plates 32 is four, and the four reflective plates 32 form four walls. When the incident angle of the sun is not completely perpendicular to the linear Fresnel lens 31 , the solar energy can still be absorbed by the vacuum tube 33 after reflection.

[0059] Preferably, the vacuum tube 33 includes an outer circular tube 331, an inner circular tube 332 and an arc-shaped connecting surface 333; the outer circular tube 331 is nested on the outside of the inner circular tube 332, and the two ends of the outer circular tube 331 and the inner circular tube 332 are connected by an arc-shaped connecting surface 333 with a circular cross-section; there is a gap between the inner circular tube 332 and the outer circular tube 331, and there is a vacuum inside the gap to reduce heat loss; the inner side of the inner circular tube 332 is in contact with the working medium, and the outer side of the inner circular tube 332 is coated with a heat-absorbing material.

[0060] Preferably, the inner circular tube 332 and the outer circular tube 331 are both made of glass.

[0061] Preferably, in this embodiment, the working fluid is water.

[0062] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A solar thermal storage and heating device based on a linear Fresnel lens, characterized in that: The device comprises a photovoltaic module, a heat storage tank, a linear Fresnel lens photothermal module, a pump, a storage battery, a three-way valve 1, a three-way valve 2, a stop valve and a housing; The heat storage tank comprises a heat preservation layer, an upper port, a guide plate, a first corrosion-resistant heat-conducting pipe, a second corrosion-resistant heat-conducting pipe, a lower port and a heat storage tank shell; The outer side of the heat storage tank shell is coated with an insulation layer, and the insulation layer completely covers the heat storage tank shell; N-1 guide plates are vertically fixed inside the heat storage tank shell, and the upper end and the lower end are respectively fixedly connected to the upper end and the lower end of the inner wall of the heat storage tank shell, and one of the left end or the right end is fixedly connected to the inner wall of the heat storage tank shell and the connection methods of two adjacent guide plates are different, so that the heat storage tank shell is divided into N interconnected flow areas along the length direction or the width direction to form an integral flow channel; the heat storage tank shell is provided with an upper port and a lower port for the flow in and out of the working medium; the upper port and the lower port are respectively located at the beginning and the end of the integral flow channel; a first corrosion-resistant heat-conducting pipe is vertically arranged in each flow area; a second corrosion-resistant heat-conducting pipe is horizontally arranged in the flow area with an upper port; the interior of the first corrosion-resistant heat-conducting pipe is filled with a first phase change material, and the interior of the second corrosion-resistant heat-conducting pipe is filled with a second phase change material; the phase change temperature of the first phase change material is greater than the phase change temperature of the second phase change material; The photovoltaic assembly is arranged on the outer surface of the housing and is electrically connected to the pump and the battery respectively; the linear Fresnel lens photothermal assembly is rotatably installed in the housing, and when in use, the position is adjusted according to the solar altitude angle to achieve optimal sunlight irradiation; the outlet of the pump is respectively connected to the inlet of the linear Fresnel lens photothermal assembly and the inlet of the branch pipe; the outlet of the branch pipe is connected to the lower port of the heat storage tank; a stop valve is arranged on the branch pipe; the outlet of the linear Fresnel lens photothermal assembly is respectively connected to the upper port of the heat storage tank and the inlet on the user side through the three-way valve 2; the inlet of the pump is respectively connected to the outlet on the user side and the lower port of the heat storage tank through the three-way valve 1; The device has three operating modes: Mode 1: The linear Fresnel lens photothermal component supplies heat to the heat storage tank: the stop valve is closed, the three-way valve 1 connects the lower port to the pump inlet, and the three-way valve 2 connects the outlet of the linear Fresnel lens photothermal component to the upper port; the working fluid is heated by the linear Fresnel lens photothermal component under the action of the pump, flows through the three-way valve 2 to reach the heat storage tank, and flows into the heat storage tank from the upper port, first heating the second corrosion-resistant heat-conducting pipe to make the second phase-change material inside it absorb heat and melt, storing energy, and then heating the first corrosion-resistant heat-conducting pipe to make the first phase-change material inside it absorb heat and melt, storing energy, and then flowing out from the lower port and returning to the pump through the three-way valve 1; Mode 2: The linear Fresnel lens photothermal component supplies heat to the user side: the stop valve is closed, the three-way valve 1 connects the outlet of the user side with the inlet of the pump, and the three-way valve 2 connects the outlet of the linear Fresnel lens photothermal component with the inlet of the user side; the working fluid flows through the linear Fresnel lens photothermal component under the action of the pump to be heated, flows through the three-way valve 2 to reach the user side, and then returns to the pump through the three-way valve 1; Mode 3, the heat storage tank supplies heat to the user side: the stop valve is opened, the three-way valve 1 connects the pump inlet and the user side outlet, and the three-way valve 2 connects the upper port and the user side inlet; the working medium flows through the branch pipe under the action of the pump, and enters the interior of the heat storage tank from the lower port of the heat storage tank, and the working medium is first heated by the first corrosion-resistant heat-conducting pipe; when the heat stored in the first corrosion-resistant heat-conducting pipe is released, the working medium is heated by the second corrosion-resistant heat-conducting pipe; then the heated working medium flows out from the upper port of the heat storage tank, passes through the three-way valve 2 to reach the user side, and returns to the pump through the three-way valve 1 after releasing the heat.

2. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1 is characterized in that: The phase change temperature of the first phase change material is ≥55°C, and the phase change temperature of the second phase change material is 35°C≤phase change temperature<55°C.

3. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1 is characterized in that: The interior of the first corrosion-resistant heat-conducting pipe is filled with a first phase-change material, and the interior of the second corrosion-resistant heat-conducting pipe is filled with a second phase-change material.

4. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1 is characterized in that: The upper port is located at the upper half of the heat storage tank shell; the lower port is located at the lower half of the heat storage tank shell.

5. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1, characterized in that: The second corrosion resistant heat conductive pipe is placed in the upper half of the flow area having the upper port.

6. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1, characterized in that: The number of the first corrosion-resistant heat-conducting pipes arranged in each flow area is the same and they are evenly arranged.

7. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1 is characterized in that: The photovoltaic assembly includes a photovoltaic panel and a first DC / DC converter and a second DC / DC converter; the photovoltaic panel is arranged on the outer surface of the shell, facing due south; the photovoltaic panel is electrically connected to the first DC / DC converter; the first DC / DC converter is electrically connected to the pump and the second DC / DC converter respectively; the second DC / DC converter is electrically connected to the battery.

8. The solar thermal storage and heating device based on linear Fresnel lens according to claim 1, characterized in that: The linear Fresnel lens photothermal assembly includes a linear Fresnel lens, a reflector, a vacuum tube and a trough reflector; the reflector forms four walls, the linear Fresnel lens is placed on the top, facing the sunlight, and the trough reflector is placed on the bottom to form an illumination space; the vacuum tube is placed in the illumination space, facing the long light spot formed by the sunlight after passing through the linear Fresnel lens; the two ends of the vacuum tube are connected to the outlet of the pump and the second three-way valve respectively through a hose; a sealing ring is provided at the connection between the vacuum tube and the hose.

9. The solar thermal storage and heating device based on linear Fresnel lens according to claim 8, characterized in that: The number of vacuum tubes is an odd number ≥ 3. The flow rate of the vacuum tube in the middle is the largest, and it gradually decreases towards both sides.

10. The solar thermal storage and heating device based on linear Fresnel lens according to claim 8, characterized in that: The vacuum tube comprises an outer circular tube, an inner circular tube and an arc-shaped connecting surface; the outer circular tube is nested on the outer side of the inner circular tube, and the two ends of the outer circular tube and the inner circular tube are connected by the arc-shaped connecting surface with a circular ring cross section; there is a gap between the inner circular tube and the outer circular tube, and the gap is vacuum for reducing heat loss; the inner side of the inner circular tube is in contact with the working medium, and the outer side of the inner circular tube is coated with a heat-absorbing material.

Images