SOLAR EVACUATED HEAT COLLECTING PANEL

Abstract

The present invention relates to a solar evacuated heat collecting panel for collecting solar energy and more particularly, to a solar evacuated heat collecting panel having a heat absorbing plate and a heat medium circulating tube mounted therein so as to withstand external stress by means of a glass window structure and to minimize loss of solar energy collected therein. The present invention provides a solar evacuated heat collecting panel for collecting solar heat to obtain energy, the solar evacuated heat collecting panel comprising: a case made of glass or a metallic material; a glass window mounted on the upper portion of the case so as to form a space together with the case; a heat collecting portion comprising a heat collecting plate seated inside the case and the glass window and at least one heat medium circulating tube attached to the lower portion of the heat collecting plate by brazing welding and mounted so as to penetrate one side of the case; a side spacer made of a metallic material so as to connect a edge of the glass window and a edge of the case to each other; an inner spacer that penetrates the heat absorbing plate so as to support the case and the glass window at a predetermined interval; and an evacuating tube mounted on one side of the case so as to evacuate the interior of the panel.

Claims

1. A solar evacuated heat collecting panel which collects solar heat to obtain energy, the evacuated heat collecting panel comprising: a case made of glass or a metallic material; a glass window mounted on the upper portion of the case so as to form a space together with the case; a heat collecting portion including a glass window mounted on the upper portion of the case so as to form a space together with the case and one or more heat medium circulation tubes attached to the lower portion of the heat absorbing plate by brazing welding and mounted by penetrating one side of the case; a side space made of a metallic material to connect an edge of the glass window and an edge of the case to each other; an inner spacer that penetrates the heat absorbing plate to support the case and the glass window at a predetermined interval; and an evacuating tube mounted on one side of the case to evacuate the interior of the panel.

2. The solar evacuated heat collecting panel of claim 1, wherein the case includes a bottom surface portion, a side surface portion formed integrally with the bottom surface portion, and a connection portion formed integrally with the upper end of the side surface portion, a plurality of horizontal embossing grooves and vertical embossing grooves are formed alternately to each other on the bottom surface portion, a plurality of vertical embossing grooves are formed on the side surface portion, and the connection portion is formed in a planar shape and the side spacer is bonded to the connection portion.

3. The solar evacuated heat collecting panel of claim 1, wherein the side spacer is formed of a or -shaped angle.

4. The solar evacuated heat collecting panel of claim 1, wherein the glass window includes horizontal grooves formed at predetermined intervals, vertical grooves formed at predetermined intervals while crossing the horizontal grooves, a plurality of dome-shaped transmission windows formed between the horizontal grooves and the vertical grooves, an outer groove formed when an outmost horizontal groove and an outmost vertical groove meet each other, and an edge connection portion formed around the outer groove, and the side spacer is bonded to the edge connection portion directly or through fritz bonding.

5. The solar evacuated heat collecting panel of claim 1, wherein the inner spacer includes a plurality of cylindrical or spherical spacers which are mounted on the lower surface of the vertical groove formed at the center of the glass window along the vertical groove to support the glass window and a pair of angle-shaped spacers which support the lower portion of the plurality of cylindrical or spherical spacers and facing each other to be elongated in a longitudinal direction.

6. The solar evacuated heat collecting panel of claim 1, wherein a getter is applied on the front surface of the case, the inner surface of the side spacer, one side or both sides of the heat absorbing plate, or a partial surface of the heat absorbing plate to absorb gas in the evacuated heat collecting panel.

7. The solar evacuated heat collecting panel of claim 1, wherein the inner spacer is made of metal, ceramic, glass or an inorganic material.

8. The solar evacuated heat collecting panel of claim 1, wherein the inner surface or the outer surface of the glass window is coated with an organic or inorganic material for increasing light transmittance and decreasing reflectance.

Description

DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a perspective view of a solar evacuated heat collecting panel according to the present invention.

[0026] FIG. 2 is a partially cutout perspective view of the solar evacuated heat collecting panel according to the present invention.

[0027] FIG. 3 is a partially sectional perspective view of the solar evacuated heat collecting panel according to the present invention.

[0028] FIG. 4 is a partially enlarged view of an edge portion of the solar evacuated heat collecting panel according to the present invention.

[0029] FIG. 5 is a partially enlarged view of an inner spacer portion of the solar evacuated heat collecting panel according to the present invention.

[0030] FIG. 6 is a perspective view viewed from a lower portion of the solar evacuated heat collecting panel according to the present invention.

[0031] FIG. 7A is a plan view of the solar evacuated heat collecting panel according to the present invention, FIG. 7B is a cross-sectional view taken along line G-G, and

[0032] FIG. 7C is a cross-sectional view taken along line J-J.

[0033] FIG. 8A is a cross-sectional view taken along line L-L and FIG. 8B is a cross-sectional view taken along line M-M in FIG. 7.

[0034] FIG. 9 is a partially enlarged view of a side spacer portion.

BEST MODE OF THE INVENTION

[0035] A best aspect of the present invention provided a solar evacuated heat collecting panel by collecting solar heat to obtain energy, in which the evacuated heat collecting panel includes: a case made of glass or a metallic material; a glass window mounted on the upper portion of the case so as to form a space together with the case; a heat collecting portion including a glass window mounted on the upper portion of the case so as to form a space together with the case and one or more heat medium circulation tubes attached to the lower portion of the heat absorbing plate by brazing welding and mounted by penetrating one side of the case; a side space made of a metallic material to connect a edge of the glass window and a edge of the case to each other; an inner spacer that penetrates the heat absorbing plate to support the case and the glass window at a predetermined interval; and an evacuating tube mounted on one side of the case to evacuate the interior of the panel.

Modes of the Invention

[0036] Hereinafter, exemplary embodiments of the present invention in which the above objects can be specifically realized will be described in detail with reference to the accompanying drawings. In describing the exemplary embodiment, the same name and the same reference numeral are used with respect to the same component and the resulting additional description will be omitted.

[0037] FIG. 1 is a perspective view of a solar evacuated heat collecting panel according to the present invention, FIG. 2 is a partially cutout perspective view of the solar evacuated heat collecting panel according to the present invention, FIG. 3 is a partially sectional perspective view of the solar evacuated heat collecting panel according to the present invention, FIG. 4 is a partially enlarged view of an edge portion of the solar evacuated heat collecting panel according to the present invention, FIG. 5 is a partially enlarged view of an inner spacer portion of the solar evacuated heat collecting panel according to the present invention, FIG. 6 is a perspective view viewed from a lower portion of the solar evacuated heat collecting panel according to the present invention, FIG. 7A is a plan view of the solar evacuated heat collecting panel according to the present invention, FIG. 7B is a cross-sectional view taken along line G-G, and FIG. 7C is a cross-sectional view taken along line J-J, FIG. 8A is a cross-sectional view taken along line L-L and FIG. 8B is a cross-sectional view taken along line M-M in FIG. 7, and FIG. 9 is a partially enlarged view of a side spacer portion.

[0038] FIG. 1 illustrates an outer side surface as an overall perspective view of a solar evacuated heat collecting panel according to the present invention. As illustrated in FIG. 1, the outer side surface of the solar evacuated heat collecting panel according to the present invention is formed by a case 200, a glass window 100 mounted at the upper portion of the case 200, and a side spacer 400 connecting the edge of the case 200 and the edge of the glass window 100 to each other.

[0039] FIG. 2 is a partially cut perspective view of the glass window 100 of the solar evacuated heat collecting panel according to the present invention. As illustrated in FIG. 2, the glass window 100 is elongated in a longitudinal direction and configured by a vertical groove 103 and a horizontal groove 102, a dome-shaped transmission window 101 formed between the vertical groove 103 and the horizontal groove 102, and an edge connection portion 104 formed at the edge. External stress may be offset to a certain extent by self structures of the dome-shaped transmission window 101 formed to protrude forward in a rounded arc shape and the grooves 102 and 103 between the transmission windows 101. That is, even if the dome-shaped transmission window 101 is stretched by heat, the grooves 102 and 103 may act as a buffer to offset the stress due to the external action. In addition, the material of the glass window 100 preferably glass having a thermal expansion coefficient that can directly bonded with a metal as boric acid glass having a high solar transmittance, and the inner side surface and the outer side surface of the glass window 100 may be coated with an inorganic or organic material for increasing light transmittance and decreasing reflectance. The heat collecting portion 300 is mounted on the lower portion of the glass window 100. The heat collecting portion 300 is configured by a heat absorbing plate 301, a heat medium circulation tube 302 welded on the lower portion of the heat absorbing plate 301 by brazing, and a support angle 303 for supporting the heat absorbing plate 301. The support angle 303 fixes the heat absorbing plate 301 to the upper portion of the heat absorbing plate 301. The upper surface of the heat absorbing plate 301 may be subjected to surface treatment or coating with a metal or an inorganic material for increasing the surface water absorption rate and lowering the reflectance. The case 200 includes a bottom surface portion 201, a side surface portion 204 formed integrally with the bottom surface portion 201 so as to form a side surface, and a connection portion 206 where the side spacer 400 is bonded to the upper end of the side surface portion 204. The connection portion 206 is preferably formed in a planar shape so that the side spacer 400 may be easily bonded. Further, an evacuated tube 207 and the heat medium circulation tube 302 are through-mounted on the side surface portion 204, and accordingly, the side surface portion 204 may serve as a support of the heat medium circulation tube 302. A horizontal embossing 203 and a vertical embossing 202 are formed on the bottom surface portion 201 to absorb a change in stress caused by an external environment due to a large mass moment of inertia. In addition, a lateral embossing 205 is formed even on the side surface portion 204 to absorb a change in stress acting to the side surface. Further, the embossings 202, 203, and 205 increase the surface area to increase an area capable of coating the getter, thereby enhancing absorption performance of gas generated in a vacuum state and constantly maintaining the degree of vacuum to 10.sup.3 torr.

[0040] Further, as illustrated in FIG. 3, an inner spacer 500 is mounted on a lower surface of the vertical groove 103 formed at a center of the glass window 100, and the glass window 100 and the case 200 are maintained at a predetermined interval by the inner spacer 500 and withstand an atmospheric pressure by the inner spacer 500. The inner spacer 500 may be formed in a cylindrical or spherical shape. A separate angle type spacer 501 may be mounted on the lower portion of the inner spacer 500. The angle type spacer 501 is elongated in a longitudinal direction to withstand the pressure acting by the atmospheric pressure. The inner spacer 500 is mounted by penetrating the heat absorbing plate 301. The evacuated tube 207 is sealed after the evacuation to maintain a constant pressure.

[0041] FIG. 4 illustrates that the connection portion 206 of the side surface portion 204 is connected with the side spacer 400. The connection portion 206 is connected with the side spacer 400 through welding or directly bonding. The side spacer 400 may be formed as an L or a C-shaped angle so as to provide a buffering action by external stress. In addition, the side spacer 400 is bonded to an edge connection portion 104 of the glass window 100. The glass window 100 and the side spacer 400 may be bonded to each other directly or through fritz bonding at a low melting point. The fritz bonding means a method of directly applying and bonding a ceramic-based specific liquid onto glass. Thus, the glass window 100 and the side spacer 400 made of the metal material may be directly bonded to each other.

[0042] FIG. 5 illustrates a relationship between the inner spacer 500 and the heat absorbing plate 301, and that the between the inner spacer 500 and the heat absorbing plate 301 are supported by the angle spacer 501. As illustrated in FIG. 5, a hole having a predetermined diameter is formed in the heat absorbing plate 301, the inner spacer 500 is inserted into the hole, and the hole has a larger diameter than the inner spacer 500 so that the heat transfer in the heat absorbing plate 301 is reduced. The angle spacer 501 is elongated in the longitudinal direction to support the inner spacer 500. The angle spacer 501 may serve to support the heat absorbing plate 301, and it is preferable to have a contact area as small as possible when the heat absorbing plate 301 is supported.

[0043] FIG. 6 illustrates a lower perspective view of the case 200. As illustrated in FIG. 6, the horizontal embossing 203 and the vertical embossing 202 are alternately formed with each other, and the lateral embossing 205 is formed on the side surface portion 204.

[0044] FIG. 7 is a plan view and a cross-sectional view of the evacuated heat absorbing panel. As illustrated in FIG. 7, the dome-shaped transmission window 101 illustrated in FIG. 7B as a cross-sectional view taken along line J-J is included and the horizontal groove 102 is formed between the transmission windows. FIG. 7C is a cross-sectional view taken along line G-G. As illustrated in FIG. 7C, the inner spacer 500 is mounted for each section.

[0045] FIG. 8 illustrates the cross-sectional view in FIG. 7 and as illustrated in FIG. 8, FIG. 8A is a cross-sectional view taken along line L-L. As illustrated in FIG. 8A, a set of heat medium circulation tubes 302 is bonded to the heat absorbing plate 301. At the center, the inner spacer 500 and the angle spacer 501 supporting the inner spacer 500 are illustrated. FIG. 8B is a cross-sectional view taken along line M-M. As illustrated in FIG. 8B, the groove 102 is shown in a plane.

[0046] FIG. 9 illustrates that the side spacer 400 is bonded to the connection portion 206 of the side surface portion 204 and the edge connection portion 104 of the glass window 100 is directly bonded to the side spacer 400. Accordingly, the glass window 100 is bonded directly to the side spacer 400 made of the metal material to secure durability against vacuum tightness.

[0047] In the present invention, a getter material may be applied on a portion except for the window glass through which solar light is transmitted. The getter material may be applied on the bottom surface portion or the side portion of the case and the side spacer. In addition, the getter material may be applied on one side or both sides of the heat absorbing plate and may be appropriately applied according to the degree of vacuum to be maintained. In addition, the inner spacer 500 may be made of a metal, ceramics, glass or an inorganic material. The side spacer 400 may have a structure such as a wrinkle shape capable of absorbing the stress generated by a temperature difference between the window glass 100 and the case 200.

[0048] While it has been described that various modifications of the present invention can be made with reference to exemplary embodiments of the present invention, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but, on the contrary, it is to be understood that the techniques that can be modified and used by those skilled in the art in the claims and the detailed description of the present invention are included in the technical scope of the present invention.

INDUSTRIAL AVAILABILITY

[0049] The present invention relates to a solar evacuated heat collecting panel for collecting solar heat energy, and is the invention having high industrial availability capable of effectively minimizing the loss of solar energy collected therein while effectively responding to the external stress by a structure of a glass window and a shape of a case.