An intelligent cooling device for photovoltaic roof panels

Abstract

The utility model provides an intelligent cooling device for photovoltaic roof panels, including a spray assembly arranged along the laying direction of the photovoltaic roof panels, which uses the evaporative cooling effect of mist water droplets to cool the surface of the photovoltaic panel by spraying; an intelligent control system, a controller on the intelligent control system is electrically connected to a temperature sensor, and the temperature sensor is used to monitor the real-time temperature of the photovoltaic panel. The linkage controller supplies or adjusts the water supply pressure on the spray assembly to achieve the pre-control effect of the photovoltaic roof panel under different working conditions, and balance the cooling performance and evaporative energy consumption of the photovoltaic panel. The device can effectively improve the continuous power generation efficiency of the photovoltaic solar panel and ensure the reliability and stability of the solar panel power generation.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and in particular to an intelligent cooling device for a photovoltaic roof panel. Background Art

[0002] Solar photovoltaic power generation is the main form of renewable energy power supply. In actual application, the increase in the working temperature of photovoltaic panels often causes problems such as low conversion efficiency and rapid aging, which greatly restricts the further popularization of photovoltaic power generation. Studies have shown that the photoelectric conversion efficiency of photovoltaic panels is only about 20%, and even lower in actual application. Most of the received solar radiation is dissipated in the form of heat energy, resulting in an increase in the working temperature of photovoltaic panels, usually above 50°C, and even up to 80°C when the heat dissipation is poor. Taking crystalline silicon photovoltaic panels as an example, after the temperature exceeds 40°C, the photoelectric conversion efficiency decreases by 0.3%-0.5% for every 1°C increase in surface temperature; after reaching its upper limit of working temperature, the aging rate doubles for every 10°C increase. Therefore, efficient and economical cooling technology for photovoltaic panels is of great significance to improving their power generation efficiency and extending their life.

[0003] In addition, the inventors found that the current photovoltaic panel cooling technology mainly includes air cooling, liquid cooling, solar photovoltaic thermal cooling (PV / T) and new cooling. The improvement effect of air cooling is limited; liquid cooling has a large water consumption and affects the uniformity of scattering and receiving solar radiation from photovoltaic panels; solar photovoltaic thermal cooling (PV / T) devices are complex and suitable for large-scale centralized use; new cooling such as phase change materials, thermoelectric refrigeration, and radiation cooling are all in the theoretical research stage, and large-scale promotion and application face huge challenges. In summary, the current photovoltaic panel cooling has certain limitations, such as limited cooling capacity, high water consumption or complex structure. In addition, the existing technology is generally continuous cooling, and the photovoltaic panels receive different solar radiation energy at different times of the day, and the working temperature of the photovoltaic panels at different times is also different. Continuous cooling cannot be adaptively cooled according to the working temperature of the photovoltaic panels, which is bound to cause energy waste, including cooling medium flow energy consumption and cooling medium loss, resulting in poor economic efficiency of cooling technology. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the utility model weighs the cooling performance of photovoltaic panels and the evaporation energy consumption, and proposes an intelligent cooling device for photovoltaic roof panels.

[0005] In order to solve the above technical problems, the utility model provides an intelligent cooling device for photovoltaic roof panels, the intelligent cooling device includes a spray assembly and an intelligent control system, characterized in that: the spray assembly includes a spray pipe arranged along the laying direction of the photovoltaic roof panel, a spray head is slidably provided on the spray pipe, and the end of the spray pipe is connected to the water supply part through the pressure control assembly;

[0006] The controller on the intelligent control system is electrically connected to a temperature sensor, and the output end of the controller is connected to a pressure control component.

[0007] In a preferred embodiment: the pressure control component includes a pressure pump and a shut-off valve, and the pressure pump and the shut-off valve are respectively connected to a controller.

[0008] In a preferred embodiment: the output end of the shut-off valve is connected to a pressure pump, and the input end thereof is connected to a water supply.

[0009] In a preferred embodiment: the water supply unit includes a water tank, a water level sensor and a water supply pipe, the water level sensor is installed at a predetermined position on the inner wall of the water tank, and is electrically connected to the controller;

[0010] The water supply pipe is connected with the inner wall of the water tank through the water supply pipe, and is connected with the external water supply system through the electric valve.

[0011] In a preferred embodiment: the electric valve is electrically connected to the controller.

[0012] In a preferred embodiment: the nozzle is an atomizing nozzle, and the atomizing nozzle is electrically connected to the controller.

[0013] In a preferred embodiment: the nozzle is a rocker arm nozzle, and the rocker arm nozzle is electrically connected to a controller.

[0014] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0015] The utility model sets an intelligent control system and uses a temperature sensor to detect the temperature of the photovoltaic roof panel in real time. When the temperature of the photovoltaic roof panel reaches a preset threshold, the temperature sensor intelligently feeds back an environmental signal to a controller. The controller controls the pressure pump and the shut-off valve on the pressure control component to open respectively, and intelligently adjusts the pump force value of the pressure pump according to the specific situation of the temperature sensor feedback information, so as to achieve the temperature control effect of the photovoltaic roof panel under different working conditions, so as to balance the cooling performance of the photovoltaic panel and the evaporation energy consumption.

[0016] The utility model utilizes the evaporative cooling effect of water flow through a spray device to cool down the surface of the photovoltaic panel, thereby preventing the normal operation of the photovoltaic panel circuit from being affected by excessive temperature. At the same time, the water flow can also flush and clean the surface of the photovoltaic panel, thereby preventing dust from blocking the surface of the photovoltaic panel and affecting the power generation efficiency of the photovoltaic panel.

[0017] The nozzle of the utility model can adjust the position and direction angle, can effectively improve the uniformity of water film spraying, effectively put an end to the situation of incomplete water film coverage, and improve the product yield of solar crystalline silicon cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a detailed structural diagram of the utility model. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0022] refer to Figure 1The utility model provides an intelligent cooling device for photovoltaic roof panels, including a spray assembly and an intelligent control system. The spray assembly includes a spray pipe 101 arranged along the laying direction of the photovoltaic roof panels, a spray head 102 is slidably arranged on the spray pipe 101, and the end of the spray pipe 101 is connected to a water supply part through a pressure control assembly. Among them, the nozzle 102, the pressure pump 103 and the shut-off valve 104 in the pressure control component, and the temperature sensor 105 arranged close to the photovoltaic panel are all electrically connected to the controller 106 on the intelligent control system. When the real-time temperature on the photovoltaic roof panel exceeds the preset threshold, the temperature sensor 105 senses and sends back a signal to the controller 106. The controller 106 drives the shut-off valve 104 connected to the front end of the water supply part to open. The pressure pump 103 connected to the front end of the shut-off valve 104 transports the water in the water supply part along the spray pipe 101 laid in the laying direction of the photovoltaic roof panel to the nozzle 102. The nozzle 102 sprays the pressurized water on the photovoltaic component panel. The water droplets diffuse on the surface of the photovoltaic panel and in the nearby air. During the vaporization and evaporation process, they can take away or absorb a large amount of heat from the photovoltaic component itself and the surrounding environment, thereby achieving the purpose of quickly cooling the photovoltaic panel.

[0023] Furthermore, the water supply unit includes a water tank 107 equipped with a water level sensor. One end of the water tank 107 is connected to the shutoff valve 104 and the pressure pump 103 in sequence through a water supply pipeline, and the other end is connected to the water supply pipe through an electric valve 108. The water level sensor is installed at a predetermined position on the inner wall of the water tank 107, and is electrically connected to the controller 106. When the water level in the water tank 107 is lower than the lowest preset threshold, the water level sensor senses the water level signal and transmits the signal back to the controller 106. The controller 106 drives the electric valve 108 connected to the input end of the water supply pipe to open. The electric valve 108 connects the water in the external water supply system to the water tank through the water supply pipe. After the continuous external water enters the water tank through the water supply pipe connected to the inner wall of the water tank, the liquid level in the water tank also rises. When the liquid level in the water tank 107 reaches the highest preset threshold of the water level sensor, the water level sensor sends a synchronous signal to the controller 106, and the controller drives the electric valve 108 to close.

[0024] The roof photovoltaic power generation system is affected by the superposition of the roof ambient temperature and the operating temperature of the components themselves. When the component temperature rises by 1°C, its output power reference value decreases by 0.45%. The temperature factor not only affects the efficiency of photovoltaic panel production, but the high temperature environment also accelerates the aging of components in the photovoltaic panel. The utility model uses the atomizing nozzle in the spraying device to spray mist droplets on the photovoltaic panel surface after the pressure water flows through the atomizing nozzle. The droplets diffuse on the component surface and in the nearby air. During the vaporization and evaporation process, the component itself and a large amount of heat nearby can be taken away or absorbed to cool the surface of the photovoltaic panel, so as to prevent the normal operation of the photovoltaic panel circuit from being affected by excessive temperature. At the same time, if the external output power of the pressure pump 103 is increased by the controller, the water pressure acting on the nozzle will also increase synchronously. The highly dense mist droplets gather on the photovoltaic panel and form a water flow, which can also play a role in flushing and cleaning the surface of the photovoltaic panel, and preventing dust from blocking the surface of the photovoltaic panel and affecting the power generation efficiency of the photovoltaic panel. In addition, considering the uniformity of spraying, the nozzle slidably connected to the spray pipe can also be set as a rocker arm nozzle. The rocker arm nozzle can improve the uniformity of water film spraying by adjusting the position and direction angle under the control of the controller 106, which can effectively prevent the situation of incomplete water film coverage and improve the product yield of solar crystalline silicon cells.

[0025] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. An intelligent cooling device for photovoltaic roof panels, comprising a spray assembly and an intelligent control system, characterized in that: The spray assembly comprises a spray pipe arranged along the laying direction of the photovoltaic roof panel, a spray head is slidably provided on the spray pipe, and the end of the spray pipe is connected to the water supply part through the pressure control assembly; The controller on the intelligent control system is electrically connected to a temperature sensor, and the output end of the controller is connected to a pressure control component.

2. The intelligent cooling device for photovoltaic roof panels according to claim 1, characterized in that: The pressure control component comprises a pressure pump and a shut-off valve, and the pressure pump and the shut-off valve are respectively connected to a controller.

3. The intelligent cooling device for photovoltaic roof panels according to claim 2, characterized in that: The output end of the shutoff valve is connected to the pressure pump, and the input end thereof is connected to the water supply part.

4. The intelligent cooling device for photovoltaic roof panels according to claim 1, characterized in that: The water supply unit includes a water tank, a water level sensor and a water supply pipe. The water level sensor is installed at a predetermined position on the inner wall of the water tank and is electrically connected to the controller. The water supply pipe is connected with the inner wall of the water tank through the water supply pipe, and is connected with the external water supply system through the electric valve.

5. The intelligent cooling device for photovoltaic roof panels according to claim 4, characterized in that: The electric valve is electrically connected to the controller.

6. The intelligent cooling device for photovoltaic roof panels according to claim 1, characterized in that: The nozzle is an atomizing nozzle, and the atomizing nozzle is electrically connected to a controller.

7. The intelligent cooling device for photovoltaic roof panels according to claim 1, characterized in that: The nozzle is a rocker arm nozzle, and the rocker arm nozzle is electrically connected to a controller.

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