Photovoltaic photo-thermal radiator

Abstract

The invention discloses a photovoltaic photo-thermal radiator which is convenient to install, ensures stable and reliable operation in use and has high heat exchange efficiency. The heat exchanger comprises two sets of collecting pipes, a plurality of flat grooves are formed in one side, in the length direction, of a pipe body of each collecting pipe at intervals, and at least one water inlet and outlet hole is formed in the upper portion, in the length direction, of each collecting pipe; the micro-channel flat pipes are arranged in a flat mode, and a plurality of micro-channels arranged at intervals are arranged on the micro-channel flat pipes in the width direction in the longitudinal cutting state; the flat grooves correspond to the outer contours of the micro-channel flat pipes in shape in a profiling mode, the two collecting pipes are arranged in parallel in a spaced mode, the flat grooves in the corresponding positions are oppositely arranged in a one-to-one correspondence mode, the corresponding ends of the micro-channel flat pipes are inserted into the flat grooves of the corresponding collecting pipes respectively, and the micro-channel flat pipes are welded and sealed. And the two collecting pipes and the plurality of groups of micro-channel flat pipes are combined to form an integral structure.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic thermal equipment, and in particular to a photovoltaic thermal radiator. Background Art

[0002] Photovoltaic thermal (PVT) radiator refers to a radiator in which the liquid working fluid flowing in the radiator collects and carries away the working waste heat generated by the photovoltaic modules when they are working, thereby achieving the effect of lowering the working temperature of the photovoltaic modules and improving the power generation efficiency.

[0003] In the prior art, photovoltaic thermal radiators generally adopt blown plate radiators or stainless steel flat plate collectors.

[0004] The principle of the blown plate radiator is to take away the heat through the high-speed liquid / air flow inside the radiator, effectively reducing the temperature of the external equipment. The blown plate is composed of two layers of metal materials, the inner layer is a metal with a high thermal expansion coefficient, and the outer layer is a metal with a low thermal expansion coefficient. The two layers of metal are connected together by brazing and other methods to form an integral structure. When the blown plate is heated, the expansion coefficient of the inner metal is greater than that of the outer metal, causing the blown plate to bend outward, the gap between the fins becomes narrower, the air flow path becomes longer, and the air speed becomes slower. The main disadvantage is that the flow resistance is large and the heat exchange efficiency is poor. Secondly, the pressure is not enough, and bulging often occurs.

[0005] The heat absorber of the stainless steel flat plate collector is made by passing two ultra-pure ferritic stainless steel plates through a 1600T press, forming them into a whole plate flow channel through a forming mold, and then through water immersion pulse welding and four-sided resistance welding. It is double-super cleaned and subjected to 100% pressure resistance test and leakage test. The main disadvantage of stainless steel is that the heat exchange efficiency is poor, and secondly, it is heavy and difficult to install.

[0006] To this end, it is urgently necessary to develop a photovoltaic thermal radiator that is easy to install and ensures stable and reliable operation and high heat exchange efficiency during use. Summary of the invention

[0007] In view of the above problems, the present invention provides a photovoltaic thermal radiator, which is easy to install and ensures stable and reliable operation and high heat exchange efficiency during use.

[0008] A photovoltaic thermal radiator, characterized in that it comprises:

[0009] Two groups of collecting pipes, each group of collecting pipes has a plurality of flat grooves arranged at intervals along one side of the pipe body in the length direction, and at least one water inlet and outlet hole is provided at the upper part of the length direction of each group of collecting pipes;

[0010] and a plurality of groups of microchannel flat tubes, which are arranged in a flattened manner, wherein in a longitudinal section, the microchannel flat tubes are arranged along the width direction with a plurality of microchannels arranged at intervals;

[0011] The shape of the flat groove corresponds to the outer contour of the microchannel flat tube, the two groups of the current collecting pipes are arranged in parallel and spaced apart, and the flat grooves at the corresponding positions are arranged one by one and facing each other, the corresponding ends of each microchannel flat tube are respectively inserted into the flat groove of the corresponding current collecting pipe, and welded and sealed, and the two current collecting pipes and several groups of microchannel flat tubes are combined to form an integral structure;

[0012] The heat exchange surface in the middle area of ​​the microchannel flat tube is flush with the supporting installation edges of the collectors on both sides, so that during installation, the heat exchange surface in the middle area of ​​the microchannel flat tube fits the surface of the corresponding photovoltaic module.

[0013] It is further characterized by:

[0014] The guiding transition zones are arranged at both ends of the microchannel flat tube in the length direction, and the middle area of ​​the microchannel flat tube in the length direction is the heat exchange area. The heat exchange surface of the heat exchange area is used to fit the surface arrangement of the corresponding photovoltaic module. The guiding transition zone is used to guide the medium to enter along the flat groove and then transition to the bending of the heat exchange area to ensure the smooth and reliable flow of the medium.

[0015] The microchannel flat tube is also provided with a raised avoidance area at a position corresponding to the photovoltaic power generation terminal, and the raised avoidance area is arranged in the shape of a raised shape of the photovoltaic power generation terminal;

[0016] During arrangement, each photovoltaic power generation terminal is arranged within the width area of ​​a single group of micro-channel flat tubes, so that each photovoltaic power generation terminal only needs to adjust the corresponding convex avoidance area of ​​a group of micro-channel flat tubes, making the manufacture of the radiator simple;

[0017] The raised avoidance area includes an ascending slope section, a horizontal section, and a descending slope section, and the conveyed raised avoidance area ensures smooth and reliable flow of the medium;

[0018] There is a gap between adjacent microchannel flat tubes along the length direction of the header;

[0019] A connecting rod is provided between the two groups of current collectors corresponding to at least two of the interval positions, and the two ends of the connecting rod are respectively welded to the current collectors on both sides, which ensures that the entire structure is stable and reliable;

[0020] The microchannel flat tube is made of aluminum material and is a thin-walled multi-microchannel flat tube. This property of aluminum is used to make the photovoltaic thermal radiator product lighter in weight and the ground / roof load is smaller during installation;

[0021] Preferably, the manifold is a round tube, and water inlet and outlet holes are provided at both ends of the manifold in the length direction, and each water inlet and outlet hole is installed with a water inlet and outlet joint.

[0022] A method for using a photovoltaic thermal radiator, characterized in that: the heat exchange surface of the middle area of ​​the microchannel flat tube is bonded to the surface of the corresponding photovoltaic module through thermal conductive silicone, and then one of the collecting pipes is used as the medium inlet and the other collecting pipe is used as the medium outlet, and a water divider is set in the collecting pipe at the medium inlet, so that the medium entering from the inlet and outlet holes is evenly divided and flows into each group of flat grooves, and then flows along each microchannel of each group of microchannel flat tubes to the collecting pipe corresponding to the medium outlet, and then flows out from the inlet and outlet holes of the collecting pipe corresponding to the medium outlet.

[0023] It is further characterized by:

[0024] In order to ensure that the pressure drop of the medium is within a reasonable range, when the length of the manifold is relatively long, water inlet and outlet holes are respectively set at both ends of the length direction of the manifold, and each group of water inlet and outlet holes is respectively connected to a group of manifolds. Each group of water inlets covers a corresponding number of flat grooves in the half length area of ​​the manifold, and the medium flows in evenly, thereby ensuring that the medium flow rate of all microchannel flat tubes is uniform and reliable.

[0025] After adopting the above technical scheme, the heat exchange surface of the middle area of ​​the microchannel flat tube is bonded to the surface of the corresponding photovoltaic module through thermal conductive silicone, and then one of the collecting pipes is used as the medium inlet and the other collecting pipe is used as the medium outlet. A water divider is set in the collecting pipe at the medium inlet, so that the medium entering from the water inlet and outlet holes is evenly divided and flows into each group of flat grooves, and then flows along each microchannel of each group of microchannel flat tubes to the collecting pipe corresponding to the medium outlet, and then flows out from the water inlet and outlet holes of the collecting pipe corresponding to the medium outlet. The heat exchange surface of the middle area of ​​the microchannel flat tube is fully and reliably used for heat exchange with the photovoltaic module. The microchannel flat tube has a small weight and is easy to install, and ensures stable and reliable operation and high heat exchange efficiency during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a front view of the present invention;

[0028] Figure 3 A top view of the present invention;

[0029] Figure 4 It is a longitudinal cross-sectional schematic diagram of a microchannel flat tube of the present invention;

[0030] Figure 5 is a side view of a header of the present invention;

[0031] The names corresponding to the serial numbers in the figure are as follows:

[0032] Ascending slope section 1, horizontal section 2, descending slope section 3;

[0033] The collecting pipe 10, the supporting mounting edge 101, the flat groove 11, the water inlet and outlet holes 12, the microchannel flat tube 20, the microchannel 21, the middle area heat exchange surface 201, the guide transition area 202, the heat exchange area 203, the raised avoidance area 204, the interval 30, and the water inlet and outlet joints 40. DETAILED DESCRIPTION

[0034] A photovoltaic thermal radiator, see Figure 1-Figure 5 , which includes two groups of manifolds 10 and a plurality of groups of microchannel flat tubes 20;

[0035] A plurality of flat grooves 11 are arranged at intervals along one side of the tube body of each group of collecting pipes 10 in the length direction, and at least one water inlet and outlet hole 12 is provided at the upper part of each group of collecting pipes 10 in the length direction;

[0036] Each group of microchannel flat tubes 20 is arranged in a flattened manner. In a longitudinal section, the microchannel flat tubes 20 are arranged with a plurality of microchannels 21 arranged at intervals along the width direction.

[0037] The shape of the flat groove 11 corresponds to the outer contour of the microchannel flat tube 20, and the two groups of headers 10 are arranged in parallel and spaced apart, and the flat grooves 11 at corresponding positions are arranged one by one and facing each other, and the corresponding ends of each microchannel flat tube 20 are respectively inserted into the flat groove 11 of the corresponding header 10, and welded and sealed, and the two headers 10 and several groups of microchannel flat tubes 20 are combined to form an integral structure;

[0038] The heat exchange surface 201 in the middle area of ​​the microchannel flat tube 20 is arranged flush with the supporting installation edges 101 of the two side headers 10, so that during installation, the heat exchange surface 201 in the middle area of ​​the microchannel flat tube 20 is arranged in contact with the surface of the corresponding photovoltaic module.

[0039] In a specific embodiment, guide transition zones 202 are provided at both ends of the microchannel flat tube 20 in the length direction, the middle area of ​​the microchannel flat tube 20 in the length direction is the heat exchange area 203, the heat exchange surface 201 of the heat exchange area 203 is used to fit the surface arrangement of the corresponding photovoltaic module, and the guide transition zone 202 is used to guide the medium to enter along the flat groove 11 and then transition to the bending of the heat exchange area 203, so as to ensure the smooth and reliable flow of the medium;

[0040] The microchannel flat tube 20 is also provided with a raised avoidance area 204 at a position corresponding to the photovoltaic power generation terminal. The raised avoidance area 204 is arranged in the shape of a raised shape of the photovoltaic power generation terminal.

[0041] During arrangement, each photovoltaic power generation terminal is arranged within the width region of a single group of micro-channel flat tubes 20, so that each photovoltaic power generation terminal only needs to adjust the corresponding raised avoidance region 204 of a group of micro-channel flat tubes 20, making the manufacture of the radiator simple;

[0042] The raised avoidance area 204 includes an ascending slope section 1, a horizontal section 2, and a descending slope section 3. The raised avoidance area 204 ensures smooth and reliable flow of the medium.

[0043] There is a gap 30 between adjacent microchannel flat tubes 20 along the length direction of the header 10 .

[0044] In specific implementation, a connecting rod (not shown in the figure, and can be arranged reasonably according to needs) is provided between the two groups of collecting pipes in the interval 30 as needed, and the two ends of the connecting rod are respectively welded to the collecting pipes 10 on both sides, which ensures that the entire structure is stable and reliable.

[0045] In specific implementation, the microchannel flat tube 20 is made of aluminum material, which is a thin-walled multi-microchannel flat tube. This property of aluminum is used to make the photovoltaic thermal radiator product lighter in weight and the ground / roof load during installation is smaller; at the same time, the collecting pipe 10 and the corresponding connecting rods are also made of aluminum material to ensure the lightweight of the entire radiator.

[0046] In a specific embodiment, the microchannel flat tube 20 has a specification of 80*3*25mm and an inner cavity with 25 microchannels 21 of 2.88*3mm. The coolant of the microchannel flat tube 20 with the technical parameters flows in from the manifold 10 of the inlet pipeline and flows out from the manifold 10 of the outlet pipeline under a certain heat exchange state, ensuring that the coolant entering each microchannel flat tube process is a liquid phase coolant, thereby improving the uniformity of the coolant flow entering the microchannel flat tube process;

[0047] The specification of the manifold 10 used is 2-φ20*1.5mm. The manifold 10 is a round tube. Under the same cross-sectional area, the flow velocity of the round tube is faster than that of the square tube because the inner surface area of ​​the round tube is smaller, the water flow resistance is smaller, and the flow velocity is faster; two water inlet and outlet holes 12 are respectively arranged at both ends of the length direction of the manifold, and each water inlet and outlet hole 12 is installed with a water inlet and outlet joint 40, which is specifically a convex cylindrical G3 / 8 pipe thread structure;

[0048] After the radiator is welded, it needs to pass the sealing pressure test: nitrogen pressure 14MPa, helium 0.8MPa without leakage;

[0049] Four raised avoidance areas 204 (26*15mm) are provided at the upper, middle and lower parts of the radiator for connection of photovoltaic power generation terminals, thereby ensuring connection of the inverter equipment.

[0050] A method for using a photovoltaic thermal radiator: a heat exchange surface 201 in the middle area of ​​a microchannel flat tube 20 is bonded to the surface of a corresponding photovoltaic module through thermally conductive silicone, and then one of the manifolds 10 is used as a medium inlet and the other manifold 10 is used as a medium outlet. A water divider is set in the manifold 10 at the medium inlet, so that the medium entering from the water inlet and outlet holes 12 is evenly divided and flows into each group of flat grooves 11, and then flows along each microchannel 21 of each group of microchannel flat tubes 20 to the manifold 10 corresponding to the medium outlet, and then flows out from the water inlet and outlet holes 12 of the manifold 10 corresponding to the medium outlet.

[0051] In specific implementation, in order to ensure that the pressure drop of the medium is within a reasonable range, when the length of the collecting pipe 10 is relatively long, water inlet and outlet holes 12 are respectively set at both ends of the length direction of the collecting pipe 10, and each group of water inlet and outlet holes 12 is respectively connected to a group of manifolds. Each group of water inlets covers a corresponding number of flat grooves 11 in the half length area of ​​the collecting pipe, and the medium flows in uniformly, thereby ensuring that the medium flow rate of all microchannel flat tubes 20 is uniform and reliable.

[0052] Its working principle is as follows: the heat exchange surface of the middle area of ​​the microchannel flat tube is bonded to the surface of the corresponding photovoltaic module through thermal conductive silicone, and then one of the collecting pipes is used as the medium inlet and the other collecting pipe is used as the medium outlet. A water divider is set in the collecting pipe at the medium inlet, so that the medium entering from the water inlet and outlet holes is evenly divided and flows into each group of flat grooves, and then flows along each microchannel of each group of microchannel flat tubes to the collecting pipe corresponding to the medium outlet, and then flows out from the water inlet and outlet holes of the collecting pipe corresponding to the medium outlet. The heat exchange surface of the middle area of ​​the microchannel flat tube is fully and reliably used for heat exchange with the photovoltaic module. The microchannel flat tube has a small weight and is easy to install, and ensures stable and reliable operation and high heat exchange efficiency during use.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A photovoltaic thermal radiator, characterized in that: It includes: Two groups of collecting pipes, each group of collecting pipes has a plurality of flat grooves arranged at intervals along one side of the pipe body in the length direction, and at least one water inlet and outlet hole is provided at the upper part of the length direction of each group of collecting pipes; and a plurality of groups of microchannel flat tubes, which are arranged in a flattened manner, wherein in a longitudinal section, the microchannel flat tubes are arranged along the width direction with a plurality of microchannels arranged at intervals; The shape of the flat groove corresponds to the outer contour of the microchannel flat tube, the two groups of the current collecting pipes are arranged in parallel and spaced apart, and the flat grooves at the corresponding positions are arranged one by one and facing each other, the corresponding ends of each microchannel flat tube are respectively inserted into the flat groove of the corresponding current collecting pipe, and welded and sealed, and the two current collecting pipes and several groups of microchannel flat tubes are combined to form an integral structure; The heat exchange surface in the middle area of ​​the microchannel flat tube is flush with the supporting installation edges of the collectors on both sides, so that during installation, the heat exchange surface in the middle area of ​​the microchannel flat tube fits the surface of the corresponding photovoltaic module.

2. A photovoltaic thermal radiator according to claim 1, characterized in that: Guide transition zones are provided at both ends of the microchannel flat tube in the length direction, and the middle area of ​​the microchannel flat tube in the length direction is a heat exchange area. The heat exchange surface of the heat exchange area is used to fit the surface arrangement of the corresponding photovoltaic component, and the guide transition zone is used to guide the medium to enter along the flat groove and then transition to the bending area of ​​the heat exchange area.

3. A photovoltaic thermal radiator according to claim 1, characterized in that: The microchannel flat tube is also provided with a raised avoidance area at a position corresponding to the photovoltaic power generation terminal, and the raised avoidance area is arranged in the shape of the raised shape of the photovoltaic power generation terminal.

4. A photovoltaic thermal radiator according to claim 3, characterized in that: Each photovoltaic power generation binding post is arranged within the width region of a single group of micro-channel flat tubes, so that each photovoltaic power generation binding post only needs to adjust the corresponding protrusion avoidance region of a group of micro-channel flat tubes.

5. The photovoltaic thermal radiator according to claim 3, characterized in that: The raised avoidance area includes an ascending slope section, a horizontal section, and a descending slope section.

6. The photovoltaic thermal radiator according to claim 1, characterized in that: There are intervals between adjacent microchannel flat tubes along the length direction of the header.

7. A photovoltaic thermal radiator according to claim 6, characterized in that: A connecting rod is arranged between the two groups of current collecting pipes in correspondence with at least two of the interval positions, and two ends of the connecting rod are respectively welded to connect the current collecting pipes on both sides.

8. The photovoltaic thermal radiator according to claim 1, characterized in that: The microchannel flat tube is made of aluminum material and is a thin-wall multi-microchannel flat tube.

9. The photovoltaic thermal radiator according to claim 1, characterized in that: The collecting pipe is a round pipe, and both ends of the collecting pipe in the length direction are provided with water inlet and outlet holes, and each water inlet and outlet hole is installed with a water inlet and outlet joint.

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