Ultrasonic-enhanced micro-channel heat dissipation system for concentrating photovoltaic solar panel

Abstract

The utility model discloses a concentrating photovoltaic solar panel micro-channel heat dissipation system enhanced by adopting ultrasonic waves, which is suitable for the technical field of heat dissipation of concentrating photovoltaic solar panels. The system comprises a concentrating photovoltaic solar cell panel, a micro-channel engraving plate, an upper connecting plate, an ultrasonic transducer, a nanofluid, a microcirculation pump, a flow meter, a pressure gauge, a cooling tower, a liquid storage tank, a main circulating pump, a bracket and the like. The device is characterized in that an ultrasonic transducer system and an ultrasonic enhancement system are arranged below the micro-channel, an electric signal is converted into an ultrasonic signal through an ultrasonic generator and a converter, ultrasonic acts on fluid in the channel, the turbulence and cavitation effects of the flowing-in fluid are improved, and therefore the heat transfer effect of the fluid is improved; therefore, the ultrasonic enhancement effect on the fluid flowing into the micro-channel is realized. According to the whole system, through heat transfer between the battery and the micro-channel plate, heat transfer between the micro-channel and the fluid and heat transfer between the fluids, timely transmission and exchange of heat of the battery panel are ensured, so that the battery panel is always in a relatively ideal range.

Description

Technical Field

[0001] The present invention relates to the technical field of battery thermal management, and specifically to a microchannel heat dissipation system for a concentrating photovoltaic solar panel enhanced by ultrasonic waves. Background Art

[0002] At present, with the gradual advancement of the 2035 and 2060 plans, in terms of the cumulative installed capacity of solar energy, according to the statistical data of the National Energy Administration, since 2015, the cumulative installed capacity of photovoltaic power generation in China has increased rapidly. In 2015, the cumulative installed capacity of photovoltaic power generation nationwide was 43.18 million kilowatts, and by 2020, it had grown to 253 million kilowatts. To a certain extent, photovoltaic power generation in China is developing rapidly. As of 2021, the cumulative installed capacity of photovoltaic power generation nationwide was 306.56GW, a year-on-year increase of 21%. With the development of multi-focus solar panel technology, the proportion has increased from 15.3% in 2015 to 46% in 2022. Among them, a solar energy heat dissipation system needs to be equipped. The development prospect of the heat dissipation system for multi-focus solar cells is very broad.

[0003] For the solar cell panel of a concentrating photovoltaic system, an effective method for its cooling is to perform local thermal improvement on the solar cell panel. The main improvement methods are heat dissipation through the working mechanisms from two different angles: partition heat dissipation and direct contact heat dissipation. Currently, the methods of direct contact cooling include direct contact liquid immersion cooling and direct contact phase change coolant cooling. Currently, the methods of partition cooling mainly include jet impingement cooling, nanofluid cooling, phase change material cooling, thermoelectric cooling, and microchannel cooling. Among them, the heat dissipation of microchannels has significant improvements in temperature uniformity, thermoelectric efficiency, and hydraulic performance, and the advantages are relatively ideal. Therefore, compared with other cooling methods, microchannel cooling has a greater development prospect. Through reasonable design, the combination of active and passive cooling, nanoparticle technology, external field strengthening, etc., it is an ideal thermal management method for the solar cell panel of a concentrating photovoltaic system, which can greatly improve the power generation efficiency of concentrating solar cells. Utility Model Content

[0004] Aiming at the problems of the existing concentrating photovoltaic solar cell panel, the application of the present utility model provides a concentrating photovoltaic solar panel microchannel system with ultrasonic enhancement characteristics, good heat dissipation performance, good temperature uniformity, simple system, and strong applicability, effectively solving the disadvantages of small heat dissipation, uneven temperature, and poor hydraulic performance of the existing concentrating photovoltaic solar panel.

[0005] To achieve the above object and solve the existing problems, the present utility model provides the following technical solutions:

[0006] A microchannel heat dissipation system for a concentrating photovoltaic solar panel strengthened by ultrasonic waves includes: a concentrating photovoltaic solar panel, a microchannel stereotype plate, an upper connecting plate, an ultrasonic transducer, nanofluid, a microcirculation pump, a flowmeter, a pressure gauge, a cooling tower, a liquid storage tank, a main circulation pump, and a bracket; an upper connecting plate for fixing the concentrating photovoltaic solar panel, which is connected to the microchannel stereotype plate with heat-conducting glue and is located below the upper connecting plate. The nanofluid circulates and exchanges heat along specific microchannel grooves in it. At the inlet, the microcirculation pump is threadedly connected to the microchannel stereotype plate through a limit hole position, and the pressure gauge is threadedly connected to the microchannel stereotype plate through a limit hole position. The pressure gauge at the inlet is used to measure the pressure of the nanofluid after being pressurized by the microcirculation pump. At the outlet, the flowmeter is threadedly connected to the microchannel stereotype plate through a limit hole position, and the pressure gauge is threadedly connected to the microchannel stereotype plate through a limit hole position. There is an ultrasonic transducer below the microchannel stereotype plate, which can strengthen the heat transfer performance of the fluid. The flowing-out fluid flows through a pipeline, is cooled by the cooling tower, and then enters the liquid storage tank. The power of the whole system is provided by the main circulation pump.

[0007] The specific structure of the system is as follows: The overall system is connected such that the upper connecting plate with the concentrating photovoltaic solar panel installed inside is at the top, and in the middle, along the route of the nanofluid flowing through the system from the inlet to the outlet, there are successively a microcirculation pump, a microchannel stereotype plate, a pressure gauge, and a flowmeter, and at the bottom is the ultrasonic transducer closely attached to the microchannel stereotype plate.

[0008] The ultrasonic transducer below is located below the microchannel stereotype plate and has the function of sending ultrasonic waves. The nanofluid in the microchannel grooves is affected by the ultrasonic waves. The ultrasonic disturbance reduces the boundary layer of the nanofluid in the grooves, increases the heat exchange amount between the fluid and the multi-focus solar panel, and keeps the overall temperature low and uniform.

[0009] The upper connecting plate is connected to the microchannel stereotype plate with heat-conducting glue, enabling better heat conduction. It can better cope with external environmental interferences such as strong winds and intense sunlight, and has a long service life. The flowmeter, pressure gauge, and microcirculation pump are connected through threaded hole positions, ensuring the correct installation of the system and also ensuring the high-strength fixation of the connection.

[0010] The concave platform of the upper connecting plate enables the multi-focus solar panel to be in direct contact with the nanofluid, which is conducive to the timely conduction of heat. The microcirculation pump keeps the flow rate of the nanofluid near an ideal flow rate for the heat transfer coefficient. The pressure gauge is used for safety detection and the adaptive regulation of the microcirculation pump. The flowmeter detects the flow rate at the outlet, ensures good system sealing, and is also applicable to the flow rate regulation of the fluid flowing into the microchannel stereotype plate.

[0011] The fluid flowing out of multiple microchannels converges through pipelines to the cooling tower for cooling to achieve heat recovery. The cooled nanofluid enters the liquid storage tank for the next cycle.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. The present utility model applies the ultrasonic enhanced heat transfer mechanism, enhances the heat transfer performance of the system, and ensures the low-temperature working state of the concentrating photovoltaic solar panel and the overall temperature uniformity.

[0014] 2. The detection systems such as the pressure gauge and flow meter of the system ensure the safety and practicability of the system, have a long service life, and can reasonably adjust the heat transfer performance of the system according to the changes of the external environment through manual control.

[0015] 3. The heat dissipation performance of the system is stable. By introducing ultrasonic heat transfer and nanofluids, the heat transfer performance of the microchannel is improved.

[0016] 4. Compared with other heat dissipation systems of the same category, this system consumes less energy, saves costs, saves energy, is green and environmentally friendly, and the photovoltaic solar panel can perform more photoelectric conversions, with better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a system diagram of a concentrating photovoltaic solar panel microchannel heat dissipation system with ultrasonic enhancement according to the present utility model.

[0018] Figure 2 FIG. is a structural block diagram of a concentrating photovoltaic solar panel microchannel heat dissipation system with ultrasonic enhancement according to the present utility model.

[0019] Figure 3 FIG. is an applied oblique axonometric view of a concentrating photovoltaic solar panel microchannel heat dissipation system with ultrasonic enhancement according to the present utility model.

[0020] Figure 4 FIG. is a rear oblique axonometric view of a concentrating photovoltaic solar panel microchannel heat dissipation system with ultrasonic enhancement according to the present utility model.

[0021] Figure 5 FIG. is a separated view of the microchannel section of a concentrating photovoltaic solar panel microchannel heat dissipation system with ultrasonic enhancement according to the present utility model.

[0022] In the figure, [1] Concentrating photovoltaic solar panel, [2] Microchannel stereotype plate, [3] Upper connecting plate, [4] Ultrasonic transducer, [5] Nanofluid, [6] Microcirculation pump, [7] Flow meter, [8] Pressure gauge, [9] Cooling tower,

[10] Main circulation pump,

[11] Bracket,

[12] Liquid storage tank. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following will further describe in detail the technical solutions of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model. It can be understood that the accompanying drawings are only for reference and explanation, and do not limit the connection method, nor are they used to limit the present utility model.

[0024] Embodiment 1:

[0025] As Figure 1 shown, connect each system well. Place the concentrating photovoltaic solar panel at the upper connecting plate. The upper connecting plate is connected to the microchannel plate through thermal conductive glue. The microcirculation pump is connected to the threaded hole position of the microchannel plate at the inlet, the flowmeter is connected to the threaded hole position of the microchannel plate at the outlet, and the pressure gauge is connected to the threaded hole position of the microchannel plate at the outlet. When the system is in the working state:

[0026] Working principle:

[0027] The concentrating photovoltaic solar panel absorbs more heat. The nanofluid is in a higher pressure state through the microcirculation pump. After entering the microchannel plate, the nanofluid will flow along the microchannel grooves. The ultrasonic transducer located at the lower part of the microchannel plate will affect the flow of the nanofluid by sending ultrasonic waves, achieving the effect of ultrasonic disturbance and enhanced heat transfer. The back of the concentrating photovoltaic solar panel is in contact with the nanofluid, and the heat conducts the heat absorbed by the concentrating photovoltaic solar panel to the nanofluid through heat conduction, ensuring timely heat conduction and keeping the concentrating photovoltaic solar panel in an ideal temperature state. The nanofluid after heat exchange flows out of the microchannel plate from the outlet. The flow rate of the nanofluid flowing out is measured by the flowmeter, and the pressure of the nanofluid flowing out is measured by the pressure gauge at the outlet. The fluid after flowing out is collected through the pipeline and then enters the cooling tower for cooling. The cooled fluid enters the liquid storage tank and enters the next cycle under the power provided by the main circulation pump.

[0028] Embodiment 2:

[0029] Connect the system as in Embodiment 1. When the flow rate of the system is small:

[0030] When the flow rate is low, it will cause insufficient heat exchange between the heat of the concentrating photovoltaic solar panel and the nanofluid, reaching the same temperature as the concentrating photovoltaic solar panel before reaching the outlet or unable to flow to the outlet. At this time, the temperature feedback system reacts to the temperature value, and then increases the power of the main circulation pump and the microcirculation pump, increases the flow rate of the nanofluid in the microchannel grooves of the microchannel plate, and enhances the emission frequency of the ultrasonic transducer. So that the heat of the concentrating photovoltaic solar panel can be dissipated in time.

Claims

1. A microchannel heat dissipation system for a concentrating photovoltaic solar panel enhanced by ultrasonic waves, characterized in that, the system includes: a concentrating photovoltaic solar cell panel (1), a microchannel stereotype plate (2), an upper connecting plate (3), an ultrasonic transducer (4), nanofluid (5), a microcirculation pump (6), a flowmeter (7), a pressure gauge (8), a cooling tower (9), a main circulation pump (10), a bracket (11), a liquid storage tank (12); the microcirculation pump (6) is connected in series at the inlet of the microchannel stereotype plate (2) to pressurize the nanofluid (5) flowing into the microchannel stereotype plate. The ultrasonic transducer (4) is closely attached to the lower part of the microchannel stereotype plate (2) through a limiting hole and has the function of transmitting ultrasonic waves to disturb the nanofluid (5) in the microchannel stereotype plate (2). The upper connecting plate (3) is connected to the microchannel stereotype plate (2) through a heat-conducting adhesive and is located above the microchannel stereotype plate (2). The concentrating photovoltaic solar cell panel (1) can be placed on the concave platform of the upper connecting plate (3). The back of the concentrating photovoltaic solar cell panel (1) is almost in contact with the microchannel stereotype plate (2). The nanofluid (5) flows to effectively exchange heat with the concentrating photovoltaic solar cell panel (1). The flowmeter (7) is located at the outlet, and the pressure gauge (8) is set at the inlet and is connected through the limiting hole of the microchannel stereotype plate (2). The outflowing nanofluid (5) flows into the cooling tower (9) for cooling to recover the heat absorbed by the concentrating photovoltaic solar panel. The cooled nanofluid (5) enters the liquid storage tank (12) for storage and enters the circulation.

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