BG4163U1 - Photovoltaic panel cooling system - Google Patents

Abstract

The utility model relates to a cooling system for a photovoltaic panel, providing optimal thermal conditions for the operation of the photovoltaic panel. The system comprises a first glass panel (3) of transparent glass and channels for cooling fluid, made in the form of two closed tangent contours of strips of connecting paste (4) applied to the first glass panel (3), as to the opposite side of the strips of connecting paste (4) is attached to the second glass panel (5) of transparent glass. It is formed at least one inlet channel for cold cooling fluid with inlet fitting (6a) and at least one outlet channel for heated cooling fluid with outlet fitting (6b), as the fittings (6a, 6b) are arranged in a distributor box (7) fixed between the first and second glass panels (3, 5).

Description

Field of technology

The utility model refers to a cooling system for a photovoltaic panel, where a circulation of cooling fluid is organized between the main and additional glass panel.

BACKGROUND OF THE INVENTION

There are various cooling systems for photovoltaic panels, aimed at achieving optimal temperature conditions for its operation.

A system and method for cooling a photovoltaic panel of U.S. Pat. No. 9,509,242 B2 is known, in which heat is removed from the panel by air cooling. The system also uses a chimney body to remove the heated air. The air circulation is performed by means of fans, relying on the effect of natural convection. The heat is removed from the photovoltaic panel by means of radiators located on its back.

The main disadvantages of such a solution are the relatively low efficiency. On the other hand, the use of special radiators and chimney body make the system more expensive.

Another similar cooling system for a photovoltaic panel is the system shown in US patent US 2014/0060620 A1. It relies on cooling by water pumped from a river water source. The removal of heat energy from the photovoltaic panel is done by pouring water, which is then taken back to the river water source. This patent uses a very simplified scheme of contact between the cooled surface and the cooling fluid, which does not guarantee uniformity of heat removal. Also, the nozzle solution is not optimized as a cost.

The photovoltaic panel cooling module described in WO 2014003334 A1 uses a piping system including a heat exchanger to dissipate heat from the panel. The system is complicated, and despite its relatively good efficiency, it is too expensive.

Another effective but relatively high cost solution is proposed in US Pat. No. 2,007,027,295 A1. It uses machined channels to realize heat dissipation and achieve the required operating parameters for the system. The main disadvantage, as mentioned above, is the relatively high cost of this solution.

Technical essence of the utility model

The task of this utility model is to create a cooling system for photovoltaic panel, providing optimal thermal conditions for operation of the photovoltaic panel through optimal temperature homogeneity in the photovoltaic panel, not violating the possibility of two-way extraction, high reliability and durability of the cooled photovoltaic panel.

This problem is solved by creating a cooling system for a photovoltaic panel with a multilayer structure of glass panels forming an intermediate flow path. The cooling system includes at least 2

EN 4163 UI one panel element is coolant circulation channels, which at least one panel element is a first transparent glass pane, and the coolant channels are formed in the form of two closed contiguous contours of strips of connecting paste applied on the first glass panel. A second clear glass glass panel is glued to the opposite side of the strips of bonding paste, forming at least one inlet channel for cold cooling fluid with inlet fitting and at least one outlet channel for heated cooling fluid with outlet fitting. The fittings are located in a distribution box mounted between the first and second glass panels.

The outlet and inlet ducts are formed as adjacent contours forming a double helix in the plane located between the first glass panel and the second glass panel, to ensure the circulation of the cooling fluid in countercurrent.

The double helix is formed by descending spirals descending one after the other, following the side contour of the photovoltaic panel, preferably the channels having a rectangular cross section.

In a preferred embodiment, the photovoltaic panel cooling system comprises two double coils of channels arranged one inside the other.

The first glass panel is the lower glass panel of a photovoltaic panel.

A photovoltaic panel with a cooling system is also created according to the utility model, including a main glass panel of clear glass, a first glass panel of clear glass, and a photovoltaic element located between them, the cooling system including channels for circulating cooling fluid. The cooling fluid channels are formed in the form of two closed contiguous contours of strips of connecting paste applied to the first glass panel, which is functionally the first glass panel of the cooling system. A second clear glass glass panel is glued to the opposite side of the strips of bonding paste, forming at least one inlet channel for cold cooling fluid with inlet fitting and at least one outlet channel for heated cooling fluid with outlet fitting. The fittings are located in a distribution box mounted between the first and second glass panels of the cooling system.

The outlet and inlet ducts are formed as adjacent contours forming a double helix in the plane located between the first glass panel and the second glass panel, to ensure the circulation of the cooling fluid in countercurrent.

The double helix is formed by descending spirals descending one after the other, following the side contour of the photovoltaic panel, preferably the cross-section of the channels is rectangular.

In a preferred embodiment of the utility model, the photovoltaic panel includes two double helices of channels arranged one inside the other.

The claimed active instantaneous cooling system is particularly efficient, as it provides a narrow operating temperature range of the photovoltaic panel, which increases over 9% of electricity yield and reduces thermal degradation. In the case of non-refrigerated photovoltaic panels, the productivity decreases by up to 80% from the initial one after about 20 years, while the offered construction prolongs the life up to 30 years without increasing by more than 15% the cost of the cooled photovoltaic panel. Offers 3

BG4163 UI also allows the use of waste heat from the coolant, which leads to a significant increase in the overall efficiency of the photovoltaic panel.

Explanation of the attached figures

Figure 1 shows a general view of a photovoltaic panel with a cooling system, according to a preferred embodiment of the utility model.

Figure 2 shows a cross section of the photovoltaic panel with a cooling system, which shows the layer-by-layer construction of the structure.

Figure 3 shows a general view of the structure, with a partially cut rear panel, which shows the way of forming the channels for the flow of coolant.

Figure 4 shows the formed channels for the cooling fluid, providing two cooling circuits.

Exemplary implementation of the utility model

An exemplary embodiment of a photovoltaic panel cooling system, according to the utility model, includes the arrangement of cooling fluid channels through which a cooling fluid passes.

Maintaining the operation of photovoltaic panels in the optimal temperature regime is of great importance for their efficiency. Existing solutions often have a high cost, which leads to an increase in the price of electricity produced. The use of the proposed cooling, using channels in the form of a double spiral, ensures operation in the required temperature range, with low cost of added components.

An exemplary embodiment of the cooling system for a photovoltaic panel has the following design - photovoltaic element 2, closed between the main 1 and the first 3 glass clear glass panel, which allows heat to pass to the back of the panel. On the back of the first glass panel 3, respectively between it and additionally connected second glass panel 5, serving for oriented and directed flow of cooling fluid, are formed channels for cooling fluid in the form of a curved closed loop with a spiral shape, for example single or preferably double spiral formed by construction of strips of strips connecting paste 4. The location of the spiral and the shape, width and depth of the channels of the spiral are chosen so that the spiral is suitable for the particular panel and specific operating conditions, and to ensure the circulation of the coolant in countercurrent. This is achieved by performing calculations, based on which the shape of the channels is determined. The calculations depend on the size and shape of the panels, the amount of energy to be taken, the flow rate of the feed pump and others.

In the two-spiral version, they are arranged one inside the other and have a rectangular cross-section. Alternatively, they may be round or otherwise. The cooling fluid in the outer coil enters the duct through the inlet fitting 6a. and is led through the outlet fitting 66. immediately adjacent to the inlet fitting 6a. Similarly, the inner coil is supplied by the inlet fitting 6c. and the fluid is removed from the outlet fitting 6d. The double helix thus located between the second glass panel 5 and the first glass panel 3 is preferably formed by decreasing in length one of the 4

BG4163 UI other spirals following the contour of the photovoltaic panel. In a preferred embodiment of the utility model, the channels preferably have a rectangular cross-section so as to cover the surface of the photovoltaic panel as much as possible to ensure maximum uniform heat removal from the photovoltaic element 2. located between the main 1 and the first 3 layer glass panel.

The fluid heated in the cooling system is cooled so that it can be reused, the cooling agent being, for example, water. Circulating water may also be used as part of another thermal system (eg heating).

The reference numbers of the technical features are included in the claims only for the purpose of increasing the comprehensibility of the claims and, therefore, these reference numbers do not have any restrictive effect on the interpretation of the elements indicated by these reference numbers.

Claims (2)

Cooling system for photovoltaic panel, comprising at least one panel element with channels for cooling fluid circulation, characterized in that at least one panel element is a first glass glass panel (3), and the cooling fluid channels are formed in the form of two closed contiguous contours of strips of connecting paste (4) applied to the first glass panel (3), with a second glass panel (5) of transparent glass glued to the opposite side of the strips of connecting paste (4), at least one inlet channel for cold cooling fluid with inlet fitting (6a) and at least one outlet channel for heated cooling fluid with outlet fitting (6b), the fittings (6a, 6b) being located in a distribution box (7) mounted between the first and second glass panel (3, 5) Photovoltaic panel with cooling system, comprising a main glass panel (1) of clear glass, a first glass panel (3) of clear glass and a photovoltaic element (2) located between them, the cooling system including channels for circulation of cooling fluid characterized by the fact that the coolant channels are formed as two closed contiguous contours of strips of connecting paste (4) applied to the first glass panel (3), which is functionally the first glass panel of the cooling system, with a connecting paste to the opposite side of the strips (4) a second transparent glass glass panel (5) is glued, in which at least one inlet channel for cold cooling fluid with inlet fitting (6a) and at least one outlet channel for heated cooling fluid with outlet fitting (6b) are formed, as the fittings (6a, 6b) are located in a distribution box (7) fixed between the first and second glass panels (3, 5)