WO2008152165A1 - Thermal solar captor made of glass - Google Patents

Abstract

Solar captor made of glass, of the type which defines a closed chamber (2) by means of a transparent cover (3), and inside includes a circulation passage for water to be heated, wherein the water circulation passage is formed by means of two transparent and opposed plates (4) and (5), between which water circulates in a thin continuous layer.

Description

 GLASS SOLAR THERMAL RECEIVER

Technical sector

The present invention is related to the heating of water by solar energy, proposing a thermal collector intended for said function, with characteristics that make it structurally and functionally advantageous.

State of the art

Among the energy applications of renewable energies, the technique of water heating by solar energy is known, using thermal collectors that take advantage of solar radiation to capture the heat of said radiation and contribute it to the water being heated.

Conventional solar thermal collectors of said function, consist of a structural assembly formed by a layer of insulating material, determining above a chamber that closes with a transparent cover, in which chamber is included, in an atmosphere of air, inert gas or empty, a coil through which the water to be heated circulates.

This formation of solar thermal collectors entails a complexity of realization, due to the need to configure the water circulation coil to be heated and its assembly inside the solar thermal collector chamber, which is costly in labor and construction machinery

The coil for water circulation to heating is usually copper, due to the thermal conductivity and oxidation resistance of this material, resulting in the coil, an expensive element, due to the amount of material required and the high cost of copper and labor necessary to perform the corresponding welding, etc.

Object of the invention

In accordance with the invention, a solar thermal collector intended for the aforementioned water heating function is proposed, the embodiment of which has been developed according to a structural formation that corrects the drawbacks of conventional thermal collectors of the same application, providing advantageous functional characteristics.

This solar thermal collector object of the invention also consists of a layer of insulating material, and a structure of three glasses separated from each other by two spaces of twelve to fifteen millimeters, including in the lower one the passage of water to be heated.

According to the invention, the passage of water circulation is formed in this case by means of two transparent glass plates or the like, arranged facing each other inside the solar thermal collector chamber, determining between them a continuous and low thickness surface space, by which establishes the circulation of the water to be heated.

In this way a solar thermal collector is obtained in glass, in which the water to be heated is exposed superficially and directly to the radiation of the incident sun, whereby an optimal use of the calorific effect of said radiation on the application water is achieved.

With this arrangement, the construction of a coil and its subsequent installation in the solar thermal collector are not necessary, but only requires the placement of the plates between which the water conduction is determined, which simplifies the construction and construction. of mounting the solar thermal collector, significantly reducing its cost.

In a practical way, the incorporation of a layered covering of conductive material tinted with a highly selective material is foreseen on one of the water conduction formation plates, which increases the effectiveness of the thermal absorption of the incident solar radiation, with a reduced cost of the material that is used, since the laminar covering for that purpose requires very little amount of conductive material compared to the coils of conventional solar thermal collectors.

Therefore, the solar thermal glass collector object of the invention results in certain advantageous features, acquiring its own life and preferential character in the application function to which it is intended.

Description of the figures

Figure 1 shows a cross-sectional diagram of the solar thermal glass collector object of the invention, according to an example of embodiment. Figure 2 is a scheme like that of the previous figure, according to another embodiment.

Detailed description of the invention

The object of the invention relates to a solar thermal collector, of which are used for the heating of water intended for any application purpose, such as domestic hot water, heating or solar cold, with an embodiment of said solar thermal collector which improves the constructive and functional characteristics.

The proposed solar thermal collector consists, according to a conventional form, of a layer of insulating material (1), which determines in the upper part a chamber (2) that is closed by a transparent cover (3), including in the chamber (2) an atmosphere of air, inert gas or vacuum.

According to the same conventional way, within the chamber (2) there is a passage of water circulation to be heated, so that the thermal energy of the solar radiation that falls through the transparent cover (3) is captured and transmitted to the circulating water.

According to the invention, the passage of water circulation inside this solar thermal collector is formed by two transparent plates (4) and (5), of glass or the like, which are arranged inside the chamber (2) in a facing position with a small separation between them.

In the assembly arrangement said plates facing each other (4) and (5) are established with a sealed seal, so that between them there is a space (6) through which a water circulation between one or more entrances at one end and one or more exits can be determined by other extreme

This results in a solar thermal collector in glass, in which the circulation of water through it is produced by the space (6) that determines an extended water layer on a relatively large and thin surface, on which achieves a very effective heating action by the solar radiations that impact through the transparent cover (3), since the thermal transmission of said radiations to the water occurs in these conditions with maximum effectiveness.

In order to improve the capture of the thermal energy of the radiation and its transmission to the water in the circulation space (β), the covering of one of the plates (4) or (5) with a laminar layer (7) of material is foreseen conductor tinted with a highly selective material, which captures and accumulates the thermal energy of the incident solar radiation, yielding said thermal energy to the water that circulates through the space (6).

The sheet covering of conductive material (7) requires a very thin layer for this purpose, which makes the increase in the cost of the solar thermal collector, due to the incorporation of said covering (6), to be unimportant; the covering (6) can be incorporated, both on the lower plate (4), according to the embodiment of Figure 1, and on the upper plate (5), according to the embodiment of Figure 2, without altering the concept.

Claims

1.- Solar thermal collector in glass, of the type comprising a layer of insulating material, determining a chamber that is closed at the top by a transparent cover, including in said chamber a passage of water circulation to be heated, characterized in that the passage of water circulation through the interior is formed by two transparent plates (4) and (5), which are arranged facing each other with a small separation between them and their sealed sealing in the assembly arrangement, remaining between said plates a space (6) through which water circulates extended in a thin layer. 2.- Solar thermal collector in glass, according to the first claim, characterized in that on one of the plates (4) or (5) that form the water conduction space (6), a laminar covering (7) is provided. ) of conductive material tinted with a highly selective material.