Full-flow-channel photovoltaic photo-thermal assembly

Abstract

A full-flow-channel photovoltaic photo-thermal assembly disclosed by the present invention comprises a photovoltaic panel and a heat absorption plate, the photovoltaic panel is arranged above the heat absorption plate, the heat absorption plate comprises an integrally formed heat absorption body, the heat absorption body is in a flat plate shape and comprises an upper surface plate, a lower surface plate, a confluence inlet flow channel and a confluence outlet flow channel, and a flat cavity is formed between the upper surface plate and the lower surface plate. The peripheral edges of the flat cavity are connected in a sealed mode through edge seals, the upper surface plate and the lower surface plate are symmetrically provided with inner concave points which are concave towards the interior of the flat cavity, the inner concave points of the upper surface plate are welded to the corresponding inner concave points of the lower surface plate, and the non-contact space in the flat cavity forms a first hollow flow channel. The bottom of the heat absorption body is provided with a confluence inlet channel communicating with the first hollow channel, and the top of the heat absorption body is provided with a confluence outlet channel communicating with the first hollow channel. The product is low in cost and high in yield, the heat absorption plate is provided with an anti-frost-heaving protection structure, heat collection blind areas are reduced, and the heat exchange rate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar photovoltaic modules, in particular to a full-flow photovoltaic and photo-thermal module. BACKGROUND

[0002] The photovoltaic and photo-thermal integrated module realizes the dual functions of power generation and hot water production, improves the power generation efficiency of the photovoltaic module, and provides hot water, the power of which is about 2-3 times of the electric power, greatly improves the utilization rate of solar energy, and has good market prospects.

[0003] The laminated photovoltaic and photo-thermal module has the following defects: glass, EVA adhesive layer, battery piece and metal heat absorption plate are laminated and combined, due to the difference in the thermal expansion coefficient between the glass and the metal heat absorption plate, transverse and longitudinal bending stresses are generated when the module changes in temperature, which causes the battery piece to crack and the service life to decrease; the heat absorption flow channel is usually 8-12 parallel metal round pipes, the number is limited, the spacing between the heat absorption flow channels is large, which affects the heat collection effect, and the heat absorption flow channel is difficult to assemble, the manufacturing cost is high, and it is not conducive to the promotion of the product; the metal round pipe is used as the heat absorption flow channel, which cannot resist frost when placed in a frozen area, and a secondary heat exchange system needs to be made, which further increases the manufacturing cost.

[0004] The welded full-flow photovoltaic and photo-thermal module has the following defects: the photovoltaic and photo-thermal module of this type adopts two pieces of stainless steel plate to stamp a semicircular flow channel, and then welds the joint point to form, the welding strength is only 0.2MPa, which is lower than the system pressure requirement, and there is a risk of pipe explosion; the cost of stainless steel material is high, and the stamping-welding process is complex, and the yield of the product is low.

[0005] Therefore, it is necessary to provide a full-flow photovoltaic and photo-thermal module to solve the above technical problems. SUMMARY

[0006] The purpose of the present application is to provide a full-flow photovoltaic and photo-thermal module with low manufacturing cost and high yield to overcome the shortcomings of the prior art.

[0007] To achieve the above purpose, the technical scheme adopted by the present application is:

[0008] A full-flow channel photovoltaic and photothermal assembly, comprising a photovoltaic panel and a heat absorption panel, the photovoltaic panel is arranged above the heat absorption panel, and the photovoltaic panel and the heat absorption panel are adhered by a heat-conducting adhesive, the heat absorption panel comprises an integrally formed heat absorption body, the heat absorption body is a flat plate, comprising an upper surface plate, a lower surface plate, a converging inlet flow channel and a converging outlet flow channel, a flat cavity is formed between the upper surface plate and the lower surface plate, the periphery of the flat cavity is sealed and connected by edge sealing, a plurality of inwardly recessed points are symmetrically arranged on the upper surface plate and the lower surface plate, the inwardly recessed points of the upper surface plate are fused with the corresponding inwardly recessed points of the lower surface plate, the space not in contact in the flat cavity constitutes a first hollow flow channel for the flow of heat medium, the bottom of the heat absorption body is provided with a converging inlet flow channel in communication with the first hollow flow channel, and the top is provided with a converging outlet flow channel in communication with the first hollow flow channel, and the cross section of the converging inlet flow channel and the converging outlet flow channel is circular. It needs to be further explained that when the heat medium is water, the flat surface position of the upper surface plate and the lower surface plate except the inwardly recessed points can cause recoverable deformation due to ice expansion when the water freezes and expands.

[0009] Preferably, a plurality of inwardly recessed points are symmetrically arranged on the upper surface and the lower surface of the converging inlet flow channel and the converging outlet flow channel along the length direction, the inwardly recessed points on the upper surface of the converging inlet flow channel and the converging outlet flow channel are fused with the corresponding inwardly recessed points on the lower surface of the converging inlet flow channel and the converging outlet flow channel, the space not in contact in the converging inlet flow channel and the converging outlet flow channel forms a second hollow flow channel, and the converging inlet flow channel and the converging outlet flow channel are flat strip structures.

[0010] Preferably, the flat surface position of the upper surface plate and the lower surface plate except the inwardly recessed points is provided with a zoomed recess.

[0011] Preferably, a plurality of second hollow flow channels are arranged in the converging inlet flow channel and the converging outlet flow channel, and the cross section of the second hollow flow channel gradually increases from the middle to both ends. It needs to be further explained that the speed of ice formation in the pipeline is the same, when the converging inlet flow channel and the converging outlet flow channel freeze, the second hollow flow channel with small cross section in the middle of the converging inlet flow channel and the converging outlet flow channel freezes completely first, and the second hollow flow channels with large cross section on both sides have not completely frozen, after the second hollow flow channel with small cross section completes freezing, the liquid in the pipeline is discharged to the two ends which have not completely frozen, the second hollow flow channels on both sides are sequentially completely frozen in order of cross section from small to large, and the excess expanded liquid in the pipeline is discharged from the converging inlet flow channel and the converging outlet flow channel, thereby completely avoiding the risk of freezing expansion damage of the converging inlet flow channel and the converging outlet flow channel.

[0012] Preferably, the converging inlet flow channel and the converging outlet flow channel are in communication with the first hollow flow channel through a connecting pipe, and the connecting pipe is vertically arranged with the converging inlet flow channel and the converging outlet flow channel.

[0013] Preferably, a plurality of fixing holes are arranged around the heat absorption plate, and a clamping edge is arranged around the upper surface plate of the heat absorption plate for embedding and fixing the photovoltaic panel.

[0014] Preferably, the first flow inlet is arranged at two ends of the converging flow inlet, and the second flow inlet is arranged vertically on the converging flow inlet, and the flow outlet is arranged at two ends of the converging flow outlet.

[0015] Preferably, the heat absorption plate is made of high-density polyethylene. It needs to be further explained that the heat absorption plate is formed by blow molding through a blow molding machine and a mold once, which reduces the manufacturing cost of the heat absorption plate.

[0016] Preferably, a heat preservation layer is arranged on the back of the heat absorption plate, and the heat preservation layer comprises aerogel, polyurethane heat preservation layer or EPP foamed board. It needs to be further explained that when the heat preservation layer adopts the EPP foamed board, the EPP foamed board will wrap around the four edges and the back of the heat absorption body.

[0017] Preferably, a reserved hole is arranged in the middle of the heat absorption plate, the reserved hole is matched with the junction box of the photovoltaic panel, and the junction box is embeddedly connected with the reserved hole.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The heat absorption plate is formed by blow molding through a blow molding machine and a mold once, and high-density polyethylene is used instead of stainless steel material, which reduces the cost of raw materials; the blow molding process of one-piece forming eliminates complex processes such as metal stamping and welding, and also avoids defects such as virtual welding and missing welding caused by welding, thereby improving the yield of products.

[0020] 2. The planar structure of the upper surface plate and the lower surface plate except the concave points can elastically deform to absorb the expansion pressure when water freezes and expands, and returns to the original state after thawing, so that the heat absorption plate body will not be damaged; the second hollow flow channel in the converging flow inlet and the converging flow outlet adopts a gradually changing cross-section design with small in the middle and large at both ends, and when icing, the small cross-section flow channel in the middle freezes first, pushing the liquid to the large cross-section flow channels at both ends which are not completely frozen, and finally discharging the excess expanded liquid from the pipeline, completely avoiding the risk of freezing and cracking of the converging flow inlet and the converging flow outlet.

[0021] 3. The upper and lower surface plates are fused to form a support framework through the concave points, which enhances the structural strength of the first hollow flow channel and meets the system pressure requirement; the first hollow flow channels densely distributed in the heat absorption plate cover the entire heat absorption plate plane, reducing the heat collection blind area and improving the heat exchange rate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the front view of the present application;

[0023] Figure 2 is a side view of the present application;

[0024] Figure 3 is a structural schematic diagram of the heat absorption plate;

[0025] Figure 4 is Figure 3 is a sectional view of A-A in FIG. 1;

[0026] Figure 5 is Figure 3 is a sectional view of B-B in FIG. 1;

[0027] Figure 6 is Figure 3 is an enlarged schematic diagram at C in FIG. 1;

[0028] Figure 7 is Figure 6 is a three-dimensional structural schematic diagram of

[0029] Figure 8 is Figure 5 is an enlarged schematic diagram at D in FIG. 1

[0030] Figure 9 is Figure 3 is a sectional view of E-E in FIG. 1;

[0031] In the figure, 1 is a photovoltaic panel, 2 is a heat absorption plate, 3 is a heat preservation layer, 4 is an upper surface plate, 5 is a lower surface plate, 6 is a converging inflow channel, 601 is a first inflow interface, 602 is a second inflow interface, 7 is a converging outflow channel, 701 is an outflow interface, 8 is an edge seal, 9 is a concave point, 10 is a first hollow channel, 11 is a second hollow channel, 12 is a connecting pipe, 13 is a fixing hole, 14 is a clamping edge, 15 is a reserved hole, 16 is a junction box, and 17 is a zoom concave DETAILED DESCRIPTION

[0032] The present application will be further clarified by the following examples and figures, which should be understood as merely illustrating the application and not limiting the scope thereof. After reading the application, those skilled in the art will be able to affect various modifications to the application without departing from the scope of the application as defined by the following claims.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0034] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, and should not be construed as limiting this invention.

[0035] like Figures 1 to 9 As shown, a full-flow photovoltaic thermal module includes a photovoltaic panel 1, a heat-absorbing plate 2, and an insulation layer 3. The photovoltaic panel is installed above the heat-absorbing plate, and the insulation layer is installed on the back of the heat-absorbing plate. The heat-absorbing plate includes an integrally formed heat-absorbing body, which is flat and includes an upper surface plate 4, a lower surface plate 5, a flow inlet channel 6, and a flow outlet channel 7. A flat cavity is formed between the upper surface plate and the lower surface plate. The four edges of the flat cavity are sealed and connected by a side seal 8. The upper surface plate and the lower surface plate are symmetrically provided with multiple recessed points 9 that are recessed into the flat cavity. The concave point is fused with the concave point corresponding to the lower surface plate. The uncontacted space inside the flat cavity forms the first hollow flow channel 10 for heat medium circulation. The bottom of the heat-absorbing body is provided with a converging inlet channel communicating with the first hollow flow channel, and the top is provided with a converging outlet channel communicating with the first hollow flow channel. The cross-section of the converging inlet channel and the converging outlet channel is rectangular, and the converging inlet channel and the converging outlet channel are flat strip structures. When the heat medium is water, the planar positions of the upper surface plate and the lower surface plate, except for the concave point, can undergo recoverable deformation due to the expansion of ice when water freezes.

[0036] The upper and lower surfaces of the converging inlet and outlet channels are symmetrically provided with multiple concave points that are recessed into the converging inlet and outlet channels along the length direction. The concave points on the upper surfaces of the converging inlet and outlet channels are fused with the corresponding concave points on the lower surfaces of the converging inlet and outlet channels. The uncontacted spaces inside the converging inlet and outlet channels form several second hollow channels 11. The cross-section of the second hollow channels gradually increases from the middle to both ends. When the water in the second hollow channel freezes, the freezing rate inside the pipe is the same. When the water in the inlet and outlet channels freezes, the second hollow channel with the smaller cross-section in the middle of the inlet and outlet channels freezes completely first, while the second hollow channels with larger cross-sections on both sides do not freeze completely. After the smaller cross-section second hollow channel freezes, it drains the liquid in the pipe to the two ends that are not completely frozen. The second hollow channels on both sides freeze completely in sequence according to the order of cross-section from small to large, and drain the excess expanded liquid in the pipe from the inlet and outlet channels, thus completely avoiding the risk of freezing and swelling damage to the inlet and outlet channels.

[0037] The inlet and outlet channels are connected to the first hollow channel via a connecting pipe 12, which is perpendicular to the inlet and outlet channels respectively.

[0038] A plurality of fixing holes 13 are arranged around the heat absorption plate, and the fixing holes are used for binding and fixing installation of the heat absorption plate. A clamping edge 14 is arranged around the upper surface plate of the heat absorption plate, and the clamping edge is used for embedding and fixing of the photovoltaic panel. The photovoltaic panel and the heat absorption plate are further fixed by heat-conducting adhesive.

[0039] The converging inflow channel is provided with a first inflow interface 601 at both ends, and is further provided with a second inflow interface 602 arranged vertically. The converging outflow channel is provided with an outflow interface 701 at both ends.

[0040] The heat absorption plate is made of high-density polyethylene. It needs to be further explained that the heat absorption plate is formed by blow molding of high-density polyethylene through a blow molding machine and a mold, which reduces the manufacturing cost of the heat absorption plate.

[0041] A heat preservation layer is arranged on the back of the heat absorption plate, and the heat preservation layer includes aerogel, polyurethane heat preservation layer or EPP foamed board. It needs to be further explained that when the heat preservation layer adopts the EPP foamed board, the EPP foamed board will wrap around the four peripheral edges and the back of the heat absorption body.

[0042] A reserved hole 15 is arranged in the middle of the heat absorption plate, and the reserved hole is matched with a junction box 16 of the photovoltaic panel. The junction box is embeddedly arranged with the reserved hole.

[0043] The upper surface plate and the lower surface plate are provided with zoom concaves 17 at the positions of the planes except the concave points. The zoom concaves are used for releasing the accommodation structure when the heat absorption plate is deformed due to thermal expansion and cold contraction.

[0044] A principle of a full-channel photovoltaic and photo-thermal assembly:

[0045] A photoelectric conversion principle: the photovoltaic panel absorbs sunlight, and directly converts solar energy into electric energy through the photoelectric effect.

[0046] A photo-thermal conversion and heat energy recovery principle: the back of the photovoltaic panel is tightly bonded with the heat absorption plate through heat-conducting adhesive, so as to ensure that the heat is efficiently transmitted to the heat absorption plate. The heat absorption plate is integrally blow molded by high-density polyethylene, and a flat cavity is formed in the heat absorption plate. A plurality of first hollow flow channels are distributed in the cavity. The heat medium enters the converging inflow channel, flows through the dense first hollow flow channels, absorbs the waste heat of the photovoltaic panel and the solar radiation heat, and is output from the converging outflow channel after being heated, so as to be used for domestic hot water or heating.

[0047] An anti-frost heaving protection principle: when water expands due to freezing, the upper and lower surface plates of the heat absorption plate can buffer the pressure through elastic deformation at the positions of the planes except the concave points, and return to the original state after thawing. The second hollow flow channels in the converging inflow channel and the converging outflow channel adopt a gradually changing cross section with a small middle part and large two ends. When frozen, the small cross section in the middle part is frozen first, so as to discharge the liquid to the two ends of the area that is not completely frozen, thereby avoiding pipe cracking.

[0048] A method for using a full-flow channel photovoltaic photothermal assembly

[0049] The related components are installed on the support through the fixing holes around the heat absorption plate, the photovoltaic plate is ensured to face the best light angle, the water inlet pipe of the heat medium circulation system is connected with the first inlet interface of the converging inlet channel at the bottom of the heat absorption plate, the water outlet pipe of the heat medium circulation system is connected with the outlet interface of the converging outlet channel at the top of the heat absorption plate, a closed circulation loop is formed, the photovoltaic plate junction box is embedded in the reserved hole of the heat absorption plate, and the photovoltaic plate is connected with the inverter or the power grid through the wiring terminal.

[0050] In use, the photovoltaic plate continuously outputs direct current, which is converted into alternating current by the inverter for load use or is incorporated into the power grid, the heat medium flows through the heat absorption plate under the drive of the pump, and is circulated to the water storage tank or the heat exchanger after absorbing heat, so that heating is realized.

[0051] The above description shows and describes the preferred embodiments of the present application, as previously described, it should be understood that the present application is not limited to the forms disclosed herein, should not be considered as excluding other embodiments, and can be used in various other combinations, modifications and environments, and can be modified within the scope of the inventive concept described herein, through the above teaching or related technical or knowledge. The modification and change made by the person skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the appended claims of the present application.

Claims

1. A full-channel photovoltaic and photo-thermal assembly, comprising a photovoltaic panel and a heat-absorbing panel, the photovoltaic panel being arranged above the heat-absorbing panel, the photovoltaic panel and the heat-absorbing panel being adhered by a heat-conducting adhesive, characterized in that: The heat absorption plate comprises a heat absorption body formed integrally, the heat absorption body is flat plate-shaped, comprises an upper surface plate, a lower surface plate, a converging inlet flow channel and a converging outlet flow channel, a flat cavity is formed between the upper surface plate and the lower surface plate, the periphery of the flat cavity is sealed and connected by edge sealing, a plurality of inner recessed points recessed into the flat cavity are symmetrically arranged on the upper surface plate and the lower surface plate, the inner recessed points of the upper surface plate are fused with the corresponding inner recessed points of the lower surface plate, the space not in contact in the flat cavity constitutes a first hollow flow channel for heat medium flow, the bottom of the heat absorption body is provided with the converging inlet flow channel in communication with the first hollow flow channel, and the top of the heat absorption body is provided with the converging outlet flow channel in communication with the first hollow flow channel, and the cross section of the converging inlet flow channel and the converging outlet flow channel is circular.

2. A full-flow channel photovoltaic-photothermal assembly according to claim 1, characterized in that: The upper surface and the lower surface of the converging inlet flow channel and the converging outlet flow channel are symmetrically provided with a plurality of inner recessed points recessed into the converging inlet flow channel and the converging outlet flow channel along the length direction, the inner recessed points of the upper surface of the converging inlet flow channel and the converging outlet flow channel are fused with the corresponding inner recessed points of the lower surface of the converging inlet flow channel and the converging outlet flow channel, the space not in contact in the converging inlet flow channel and the converging outlet flow channel forms a second hollow flow channel, and the converging inlet flow channel and the converging outlet flow channel are flat strip-shaped structures.

3. A full-flow channel photovoltaic-photothermal assembly according to claim 1, characterized in that: The flat surface positions of the upper surface plate and the lower surface plate except the inner recessed points are provided with zooming recesses.

4. A full channel photovoltaic / photothermal assembly according to claim 1, characterized in that: The converging inlet flow channel and the converging outlet flow channel are provided with a plurality of second hollow flow channels, and the cross section of the second hollow flow channels gradually increases from the middle part to the two ends.

5. A full channel photovoltaic / photothermal assembly according to claim 1, characterized in that: The converging inlet flow channel and the converging outlet flow channel are in communication with the first hollow flow channel through a connecting pipe, and the connecting pipe is vertically arranged with the converging inlet flow channel and the converging outlet flow channel.

6. A full channel photovoltaic / photothermal assembly according to claim 1, characterized in that: A plurality of fixing holes are arranged around the heat absorption plate, and a clamping edge is arranged around the upper surface plate of the heat absorption plate for embedding and fixing the photovoltaic panel.

7. A full channel photovoltaic / photothermal assembly according to claim 1, characterized in that: The converging inlet flow channel is provided with a first inlet interface at the two ends, and is further provided with a second inlet interface arranged vertically, and the converging outlet flow channel is provided with an outlet interface at the two ends.

8. A full channel photovoltaic / photothermal assembly according to claim 1, characterized in that: The heat absorption plate is made of high-density polyethylene.

9. A full channel photovoltaic / photothermal assembly according to claim 1, wherein: A heat preservation layer is arranged on the back of the heat absorption plate, and the heat preservation layer comprises aerogel, polyurethane heat preservation layer or EPP foaming plate.

10. A full channel photovoltaic photo thermal assembly according to claim 1, characterized in that: The heat absorption plate is provided with a reserved hole in the middle part, the reserved hole is matched with a junction box of the photovoltaic panel, and the junction box is embeddedly arranged in the reserved hole.

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