Concentrating photovoltaic module and system formed by same

Abstract

The invention discloses a concentrating photovoltaic module and a system formed by the concentrating photovoltaic module. The concentrating photovoltaic module comprises a module box and a radiator, the module box comprises a front panel, side plates and a back plate, the front panel is arranged at the end part of the back plate, the side plates are arranged at the side parts of the back plate, and the longitudinal section formed by the front panel, the side plates and the back plate is an isosceles trapezoid; the radiator comprises an evaporator and a condenser which are connected through a circulating pipeline, the evaporator is arranged on a bottom plate of the back plate, and the condenser is arranged on an upper inclined plate of the back plate; the circulating pipeline comprises a liquid pipeline and a steam pipeline, one end of the evaporator is connected with the condenser through the liquid pipeline, and the other end of the evaporator is connected with the condenser through the steam pipeline. The concentrating photovoltaic module and the system formed by the concentrating photovoltaic module are reasonable in structure, convenient to construct and capable of effectively dissipating heat, improving the power generation efficiency and guaranteeing the service life and the use reliability of a solar cell.

Description

technical field [0001] The invention belongs to the technical field of concentrating photovoltaics, and relates to a concentrating photovoltaic assembly and a system composed thereof. Background technique [0002] Concentrated Photovoltaics (CPV) refers to a technology that directly converts concentrated sunlight into electrical energy through photovoltaic cells with high conversion efficiency. , only 20-30% of the light energy is converted into electrical energy, and the remaining energy will be converted into the form of heat energy, which is transmitted over a very small heat dissipation area through the high-intensity heat transfer process, which will destroy the photovoltaic power generation cell. The life span has an important impact on the safety and reliability of the operation of the concentrating photovoltaic system. [0003] Therefore, the performance of the radiator plays a crucial role in reducing the temperature of the concentrating photovoltaic cell. In the h...

AI Technical Summary

Problems solved by technology

[0004] Common passive cooling radiators are air coolers, which use natural convection. You can add a copper or aluminum heat dissipation bottom plate on the back of the battery, or add fins to increase the heat exchange effect. Natural cooling is easy to install and low in cost, but The cooling effect is limited, such as the concentrating photovoltaic solar radiator disclosed in Chinese patent document CN104283509A, which can also use forced convection, and an air flow channel must be installed on the back of the battery, and a fan must be installed in the flow channel. The forced flow cooling effect is better than natural convection. However, due to the addition of fans, additional power will be consumed

[0005] Common active cooling is water cooling, such as the water-cooled concentrated photovoltaic solar farm disclosed in Chinese patent document CN102647115A. The water cooling system is mainly composed of three parts: heat exchanger, water tank and valve. , trough type, plate built-in trough type and water tank base type, plate tube type is designed according to the development of solar flat plate collectors, this kind of structure can better solve the leakage problem of cooling working fluid, and is compatible with photovoltaic The battery maintains good insulation; the trough type is similar to the heat exchange of the air flow channel, which greatly increases the contact area between the cooling medium and the photovoltaic cell, thereby enhancing the heat exchange effect, but this structure has the problem of leakage of the working medium , and the insulation characteristics of photovoltaic cells are poor; the water tank base type is to connect the photovoltaic cells directly to the water tank with slopes, and use the water tank as a container for cooling fluid and the base of the system, but usually the entire concentrated photovoltaic array uses a water-cooled The radiator system cannot be flexibly set according to the form of concentrating photovoltaic modules. When the water cooling module of some concentrating photovoltaic modules fails, it may affect the heat dissipation of the entire concentrating photovoltaic array

[0006] In addition, there are some new heat dissipation technologies. The evaporating end is a flat heat pipe radiator, and the photovoltaic cell is connected to the flat evaporating end. For example, a heat pipe cooling system applied to concentrated photovoltaics disclosed in Chinese patent document CN102097515A, but the evaporating end High processing technology requirements, short heat transfer process and low efficiency, the water-cooled cooling method of the micro-channel structure, due to the special structure, the flow resistance of the fluid in the micro-channel is large, the required external pump power consumption is large, and the micro-channel heat dissipation structure is difficult to process , high cost, and liquid immersion heat dissipation technology that immerses photovoltaic cells in liquid, but higher requirements are placed on the structure of photovoltaic cells and liquid storage structures

[0007] In the prior art, the tracking-type concentrating gallium arsenide photovoltaic power generation system changes with the sun's altitude angle. The evaporator and condenser of the air-cooled loop heat pipe radiator are located on the back of the module box, and the back of the module box is a plane as a whole. , so the position of the condenser can be slightly higher than the heat-absorbing surface of the evaporator when the module box has a large inclination relative to the ground, but the solar altitude angle is very high in summer. The evaporator will be almost at the same level as the heat-absorbing surface, or the radiator will be lower than the heat-absorbing surface, resulting in insufficient liquid replenishment on the heat-absorbing surface of the evaporator, or drying up, which will cause the temperature-controlled radiator to fail

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