HYBRID SOLAR PANEL FOR PRODUCING ELECTRICAL ENERGY AND THERMAL ENERGY

Abstract

The present invention discloses a hybrid solar panel for producing electrical energy and thermal energy, comprising a photovoltaic power generation system, a heat absorber, wherein heat is evacuated from the photovoltaic generation system increasing electrical efficiency, an intermediate layer of material or gas, wherein the junction of the photovoltaic power generation system with the heat absorber is performed by means of two layers of material with a silicone base, where the first layer comprises encapsulating silicone inside the photovoltaic generation system and the second layer comprises a thermal adhesive silicone.

Claims

1. A hybrid solar panel for producing electrical energy and thermal energy, comprising: a photovoltaic power generation system (6), with at least one photovoltaic cell, a heat absorber (7) for evacuating heat from the photovoltaic generation system (6) by means of a heat transfer fluid, a transparent insulating cover (1) sealed along the perimeter to the photovoltaic generation system, an intermediate layer (2) of vacuum, inert gas or air between the photovoltaic generation system and the transparent insulating cover (1), a lower insulating layer (4) located below the heat absorber (7), a perimeter frame (9) with a rear sheet or a casing comprising the four sides of the perimeter and the rear part, wherein it additionally comprises a junction for joining the photovoltaic power generation system (6) with the heat absorber, the junction comprising two layers of material with a silicone base, where a first layer comprises encapsulating silicone (3) inside the photovoltaic generation system (6) and projecting above said photovoltaic generation layer (6), the encapsulating silicone (3) presenting a refractive index of less than 1.45 and an optical transmission index greater than 98%, and the junction further comprising a second layer of a thermal silicone (8) with a thermal conductivity greater than 0.2 W/m.Math.K, characterized in that said thermal silicone (8) is located above and adjacent to the heat absorber (7) so that the junction joins the photovoltaic power generation system (6) with the heat absorber (7) devoid of a backsheet (10) therebetween and thus eliminating a heat conduction barrier for the photovoltaic cells.

2. The hybrid solar panel for producing electrical energy and thermal energy according to claim 1, characterized in that it is devoid of a tempered glass (11) therebetween the encapsulating silicone (3) yielding lower reflection losses.

3. The hybrid solar panel for producing electrical energy and thermal energy according to claim 1, characterised in that layer of thermal adhesive silicone (8) comprises an oxide particle load in the order of 1-200 μm.

4. The hybrid solar panel for producing electrical energy and thermal energy according to claim 2, characterised in that the thermal adhesive silicone (8) presents a curing at room temperature by a platinum catalyst with a ratio of 5:1 to 20:1.

5. The hybrid solar panel for producing electrical energy and thermal energy according to any of claims 1-4, characterised in that the encapsulating silicone (3) comprises a pourable two-component silicone that vulcanises into an elastomer, at a mixture ratio of 10:1.

6. The hybrid solar panel for producing electrical energy and thermal energy according to claim 5, characterised in that the encapsulating silicone (3) presents a curing by means of adding a catalyst with a ratio of 5:1 to 20:1.

Description

DESCRIPTION OF THE DRAWINGS

[0043] To complement the description that is being made and for the purpose of helping to better understand the features of the invention according to a preferred practical embodiment thereof, a set of drawings is attached as an integral part of said description in which the following is depicted in an illustrative and non-limiting manner:

[0044] FIG. 1 shows a side section view of the hybrid panel according to a first embodiment of the present invention in which the embodiment without a backsheet and without a layer of glass adjacent to the photovoltaic generation system is clearly shown.

[0045] FIG. 2 shows a side section view of the hybrid panel according to a second embodiment of the present invention in which the embodiment without a backsheet and with the layer of glass adjacent to the photovoltaic generation system is clearly shown.

[0046] FIG. 3 shows a side section view of the hybrid panel according to a fourth embodiment of the present invention in which the embodiment with the backsheet and with the layer of glass present, adjacent to the photovoltaic generation system is clearly shown.

PREFERRED EMBODIMENT OF THE INVENTION

[0047] FIG. 1 shows a side section view of the hybrid panel according to a first embodiment of the present invention in which a transparent insulating cover (1) sealed along the perimeter in the upper part of the panel can be seen, with said insulating cover (1) being located immediately above an intermediate layer (2) of vacuum, air or inert gas. Located adjacent to and below said intermediate layer (2) is the layer of encapsulating silicone (3) having an optical transmission greater than 98% and a refractive index of less than 1.45. Said layer of encapsulating silicone (3) allows the junction between photovoltaic cells (6) and projects above said cells. Located immediately adjacent to and below said layer of encapsulating silicone (3) and the photovoltaic power generation system (6) is the second layer of material with a silicone base, the layer of thermal adhesive (8), having thermal conductivities in the order of 0.2-3 W/m*K, allowing the junction of the set of photovoltaic cells (6) with a heat absorber (7), facilitating the transfer of heat to a heat transfer fluid (going through the absorber), thereby increasing the electrical efficiency of the photovoltaic system (6) and furthermore increasing the thermal efficiency by means of thermal conductivities in the thermal adhesive silicone (8) that are higher than those of the materials known in the state of the art for this function. The layer of thermal adhesive silicone (8) has an oxide particle load in the order of 1-200 μm.

[0048] Finally, the lowest part of the panel has an insulating layer (4) bordering the perimeter frame (9) forming the outside of the hybrid photovoltaic thermal generation panel.

[0049] FIG. 2 shows a side section view of the hybrid panel according to a second embodiment of the present invention in which a transparent insulating cover (1) sealed along the perimeter in the upper part of the panel can be seen, with said insulating cover (1) being located immediately above an intermediate layer (2) of vacuum, inert gas or air. Located adjacent to said intermediate layer (2) is tempered glass (11) joined by means of a layer of encapsulating silicone (3) having an optical transmission greater than 98% and a refractive index of less than 1.45. Said layer of encapsulating silicone (3) allows the junction between photovoltaic cells (6) and projects above said cells. Located immediately adjacent to and below said layer of encapsulating silicone (3) and the photovoltaic power generation system (6) is the second layer of material with a silicone base, the layer of thermal adhesive (8), having thermal conductivities in the order of 0.2-3 W/m*K, allowing the junction of the set of photovoltaic cells (6) with a heat absorber (7), allowing the transfer of heat to a heat transfer fluid, thereby increasing the electrical efficiency of the photovoltaic system (6) and furthermore increasing the thermal efficiency by means of thermal conductivities in the thermal adhesive silicone (8) that are higher than those of the materials known in the state of the art for this function. Finally, the lowest part of the panel has an insulating layer (4) bordering the perimeter frame (9) forming the outside of the hybrid photovoltaic thermal generation panel.

[0050] FIG. 3 shows a side section view of the hybrid panel according to a third embodiment of the present invention in which a transparent insulating cover (1) sealed along the perimeter in the upper part of the panel can be seen, with said insulating cover (1) being located immediately above an intermediate layer of vacuum, inert gas or air (2). Located adjacent to said intermediate layer (2) is tempered glass (11) joined by means of a layer of encapsulating silicone (3) having an optical transmission greater than 98% and a refractive index of less than 1.45. Said layer of encapsulating silicone (3) allows the junction between photovoltaic cells (6) and projects above said cells. Located immediately adjacent to and below said layer of encapsulating silicone (3) is a layer of backsheet (10). Said layer of backsheet is joined to a heat absorber (7) by means of a second layer of material with a silicone base, said layer being the layer of thermal adhesive (8), having thermal conductivities in the order of 0.2-3 W/m*K, as well as a high heat transfer by means of a heat transfer fluid, thereby increasing the electrical efficiency of the photovoltaic system (6) and furthermore increasing the thermal efficiency by means of thermal conductivities in the thermal adhesive silicone (8) that are higher than those of the materials known in the state of the art for this function. Finally, the lowest part of the panel has an insulating layer (4) bordering the perimeter frame (9) forming the outside of the hybrid photovoltaic thermal generation panel.