WO2012162920A1

WO2012162920A1 - Evacuated flat plate solar collector

Info

Publication number: WO2012162920A1
Application number: PCT/CN2011/076501
Authority: WO
Inventors: 朱雷
Original assignee: Zhu Lei
Priority date: 2011-05-31
Filing date: 2011-06-28
Publication date: 2012-12-06
Also published as: CN102200352A; CN102200352B

Abstract

An evacuated flat plate solar collector is provided, which comprises a solar heat exchanging body and a chamber. The solar heat exchanging body comprises a liquid inlet header (14) and a liquid outlet header (15) which are communicated with each other by at least two heat absorbing tubes (11). A heat absorption plate (8) is tightly contacted with the heat absorbing surface of each heat absorbing tube (11). The chamber is a vacuum room (6), in which the solar heat exchanging body is disposed. The vacuum room (6) is composed of a face plate, a bottom plate and a metal frame (5) set along the peripheries of the face plate and the bottom plate, wherein the face plate is a glass plate (1), and the bottom plate is a glass plate (1) or a metal plate (9). A metal strip (2), which is provided at the periphery of the glass plate (1), is adhered to the glass plate (1) into an integrated entity. The metal materials at the peripheries of the face plate and the bottom plate are welded with the metal frame (5), thereby achieving the sealing of the vacuum room (6). A supporting device composed of a positioning bracket (10) and a plurality of supporting bodies (7) is disposed between the face plate and the bottom plate, wherein the supporting bodies (7) are fixed on the positioning bracket (10). The supporting bodies (7) are supported between the face plate and the bottom plate after passing through the corresponding holes at the heat absorption plate (8).

Description

Full vacuum flat solar collector

Technical field

The invention relates to a solar collector, in particular to a full vacuum flat solar collector. Background technique

Solar energy is an efficient energy source and does not cause environmental pollution. With the development of science and technology, the application fields of solar energy are becoming more and more extensive.

In many solar energy applications, solar collectors have been used earlier, with focused solar collectors and endothermic solar collectors, especially for endothermic solar collectors. .

Among the endothermic solar collectors, one is a high-efficiency heat absorbing tube, which is made up of two different diameter glass blind tube sets, and the first end is flame-sealed and vacuum-sealed. The heating tube, which is used for the glass tube, is easily damaged during transportation, installation and use, and the heat absorption efficiency per unit area is lowered due to the gap between the tubes during installation. Another type is a conventional flat plate collector, which mainly absorbs the heat of the sun through a heat collecting plate and directly transmits a set of water pipes to obtain heat from the liquid in the water pipe. Such a solar heat exchanger has a simple structure, but a large amount of absorbed heat energy is re-dissipated through the light-transmitting panel, so the efficiency is not high.

Regardless of the type of collector, the solar heat exchangers are exposed to the natural environment. In the convection of air, part of the heat is lost, which affects the utilization of solar energy.

How to improve the utilization rate of solar energy has always been a topic of long-term concern in this field. To the best of the applicant's knowledge, the entire solar collector unit has been placed in a vacuum adiabatic environment and has not been reported so far.

Summary of the invention

The object of the present invention is to provide a new full-vacuum flat solar collector for a series of problems such as the processing cost of the current solar heat exchanger, or the thermal efficiency is not high, or the volume is too large, or the assembly is difficult in use. .

The object of the present invention is achieved by: a full vacuum flat solar collector comprising a solar heat exchanger and a chamber characterized by:

a) the solar heat exchanger comprises a liquid inlet manifold and a liquid outlet manifold, and the inlet manifold and the outlet header communicate with each other by at least two heat absorbing tubes; a heat absorbing plate and each heat absorbing tube The heat absorbing surface is in close contact; the chamber is a vacuum chamber, and the solar heat exchanger is placed in the vacuum chamber, At least one end of the liquid manifold and the outlet manifold extends out of the vacuum chamber;

b) the vacuum chamber comprises a panel of the same geometric shape, a bottom plate, and a metal frame having a rectangular cross section disposed along the periphery thereof, the panel being glass, the bottom plate being a glass or a metal plate, and the glass periphery A metal strip that is glued together, the metal strip extends outward beyond the edge of the glass; the seal of the vacuum chamber is welded between the metal strip and the metal frame around the glass in the panel and the bottom plate, or the metal strip around the glass in the panel And welding between the metal plate as the bottom plate and the metal frame;

c) a support device is further disposed between the panel and the bottom plate, the support device is composed of a positioning bracket and a support body, and the positioning bracket is located between the heat absorption tube and the bottom plate, and the support body is evenly distributed in the adjacent heat absorption tube In the gap

d) the heat absorbing plate is provided with a hole corresponding to the support body, the support body is fixed by the positioning bracket, and the support body is supported between the panel and the bottom plate through the corresponding hole in the heat absorbing plate;

e) the vacuum of the vacuum chamber is

In the present invention, the heat absorbing plate is in close contact with the heat absorbing surface of each heat absorbing tube: the heat absorbing plate and the heat absorbing surface of each heat absorbing tube are integrally fixed by welding, or the heat absorbing plate and each suction The heat pipe is cast as one.

In the present invention, the actual thickness of the heat absorbing plate and the heat absorbing tube which are integrally or integrally molded by welding is less than 30 mm.

In the present invention, the glass for the panel is a lead-free glass having high light transmittance, and the periphery of the glass is bonded to the metal strip by a low-melting glass.

In the present invention, a length of the metal strip extending outwardly beyond the glass contains an energy absorbing zone and a lands, the lands are located at the outer ends of the metal strips, and the energy absorbing zone is located between the lands and the edges of the glass, said energy absorbing zone It is corrugated or broken.

In the present invention, a getter or a vacuum detecting probe is placed in the vacuum chamber.

In the present invention, the cross section of the profile of the machined metal frame is a hollow rectangle, and in the hollow rectangular section, a gas groove or a pore is provided in the wall facing the vacuum chamber, and the probe of the getter or vacuum detecting unit is disposed in the A rectangular hollow area.

In the present invention, an aluminum alloy frame is further disposed around the full vacuum flat solar collector, and the profile of the aluminum alloy frame is """, and the metal frame around the panel and the bottom plate is embedded in the aluminum alloy. In the border.

In the present invention, when the metal frame is embedded in the aluminum alloy frame, a heat insulating layer is disposed between the metal frame and the aluminum alloy frame.

The invention has the advantages that: the invention places the whole solar heat collecting unit in the vacuum heat holding cavity, eliminates the gas convection heat dissipation in the heat collector, effectively isolates the heat conduction of the heat collecting unit to the panel and the bottom plate, and greatly improves The thermal efficiency of the collector. Taking the panel as an example, even if the temperature of the heat absorbing portion of the heat collecting unit reaches 300 degrees, the temperature of the surface of the glass as the panel is not more than 30 degrees with respect to the ambient temperature; The solid metal strip, especially the metal strip, is also provided with an energy absorbing zone, which not only effectively solves the glass bursting caused by local thermal expansion and contraction and rapid cooling and the adverse effects on the peripheral seal, but also effectively solves The problem that the flat plate collector cannot work at a high temperature state; since the heat absorbing plate and the heat absorbing surface of each heat absorbing tube are integrally integrated by welding, or the heat absorbing plate is integrally molded with each heat absorbing tube, the structure is compact, and heat is collected. The thickness of the unit can be controlled below 30mm; since the invention mainly utilizes the vacuum insulation function, it can avoid the use of a large amount of thermal insulation materials, reduce or avoid environmental pollution caused by the replacement of the thermal insulation material during maintenance; The aluminum alloy frame is also arranged around the device to avoid damage to the collector during handling and installation.

DRAWINGS

Figure 1 is a schematic cross-sectional view of a glass containing a metal strip around;

2 is a schematic view of a glass of an energy absorption zone and a weld zone in a peripheral metal strip; FIG. 3 is a schematic view of a glass of another energy absorption zone and a weld zone in the peripheral metal strip; FIG. 4 is another energy in the peripheral metal strip a schematic view of the glass of the absorption zone and the weld zone; FIG. 5 is a schematic view of the structure of the vacuum chamber;

Figure 6 is a schematic view showing another structure of a vacuum chamber;

Figure 7 is a schematic structural view of a support device in a vacuum chamber;

Figure 8 is a schematic structural view of a solar heat exchange body in a vacuum chamber;

Figure 9 is a schematic view showing the structure of an embodiment of the present invention.

In the figure: 1, glass, 2, metal strip, 3, low melting glass, 4, aluminum alloy frame, 5, metal frame, 6, vacuum chamber, 7, support, 8, heat absorbing plate, 9, metal plate, 10. Positioning bracket, 11, heat absorbing tube, 12, getter, 13, probe, 14, inlet manifold, 15, outlet manifold. detailed description

As can be seen from Fig. 1, the glass used in the present invention is in the glass 1 as a metal strip 2 which is integrally provided, and the metal strip 2 extends outward beyond the edge of the glass 1. In the present embodiment, the glass 1 is made of a lead-free glass having good light transmittance, and the glass and the metal strip 2 are bonded together by a low-melting glass.

2 differs from FIG. 1 in that a length of metal strip 2 extending outwardly beyond the glass 1 contains an energy absorbing zone and a weld zone, the weld zone being located at the outer end of the metal strip, and the energy absorbing zone being located between the weld zone and the edge of the glass. The energy absorbing zone is in the shape of a fold line.

The difference between Fig. 3 and Fig. 2 is that the energy absorbing zone is corrugated.

The difference between Fig. 4 and Fig. 2 is that the energy absorbing zone is in the form of another form of broken line. It can be seen from 5 that the vacuum chamber 6 comprises a panel, a bottom plate and a metal frame 5. In the embodiment, the panel and the bottom plate are both composed of a glass 1 and a metal frame 5 as shown in FIG. 2, and the vacuum chamber 6 passes through the glass 1. The welding zone of the surrounding metal strip 2 is welded to the metal frame 5, and the vacuum chamber 6 is uniformly distributed with the support body 7; further, the section of the processed metal frame 5 is hollow rectangular, and in the hollow rectangular section, facing the vacuum chamber A gas groove or a gas hole is provided in the wall of the wall 5, and a probe 13 of the vacuum degree detecting unit is further provided in the rectangular hollow area.

Fig. 6 differs from Fig. 5 only in that the bottom plate constituting the vacuum chamber 5 is selected from a metal plate 9, and therefore, the lower side of the metal frame 5 is welded to the metal plate. In this embodiment, the metal base plate is made of a stainless steel plate. In the specific implementation, in order to prevent heat loss from the metal base plate, a heat insulating material may be attached to the lower surface of the metal base plate.

Either 5 or FIG. 6, a vacuum chamber, a vacuum degree of 6 1.33X10 ~ 10- ² Pa.

As can be seen from Fig. 7, the supporting device comprises a positioning bracket 10 and a support body 7, and the support body 7 is positioned in the positioning bracket 10.

As can be seen from Fig. 8, the solar heat exchanger comprises a liquid inlet manifold 14 and an outlet manifold 15, and the inlet manifold 14 and the outlet manifold 15 communicate with each other by at least two heat absorbing tubes 11; 8 is in close contact with the heat absorbing surface of each heat absorbing tube 11. In the present embodiment, the heat absorbing plate 8 is further provided with a hole corresponding to the support body, and the hole is located between the adjacent heat absorbing tubes 11. In a specific implementation, the heat absorbing plate 8 and the heat absorbing surface of each of the heat absorbing tubes 11 may be integrally fixed by welding, or the heat absorbing plate 8 and the heat absorbing tubes 11 may be integrally molded.

Figure 9 is an embodiment in which Figures 5, 7 and 8 are assembled, as can be seen from the figure, solar heat The replacement body is placed in the vacuum chamber 6 without lead, and the positioning bracket 10 of the supporting device is located between the heat absorbing tube 11 and the bottom plate, and the supporting body 7 is evenly distributed in the gap of the adjacent heat absorbing tube 11; After being fixed by the positioning bracket, it is supported between the panel and the bottom plate through corresponding holes in the heat absorbing plate 8. When assembled, at least one end of the liquid inlet manifold 14 and the liquid outlet manifold 15 protrudes from the vacuum chamber 6.

In the present embodiment, the panel and the bottom plate are both made of glass 1 shown in Fig. 2, and in order to ensure the degree of vacuum of the vacuum chamber 6, a getter 12 is placed in the vacuum chamber 6.

In this embodiment, an aluminum alloy frame 4 is further disposed around the full vacuum flat solar collector, and the profile of the aluminum alloy frame 4 is "]", and the metal frame 5 around the panel and the bottom plate is embedded in the aluminum alloy frame. 4 in.

In the specific implementation, in order to prevent heat loss of the metal frame 5, when the metal frame 5 is embedded in the aluminum alloy frame 4, a heat insulating layer may be disposed between the metal frame 5 and the aluminum alloy frame 4.

The above embodiments are not intended to limit the present invention, as long as the ordinary staff in the art, in combination with the basic common knowledge in the field, make non-structural improvements under the enlightenment of the embodiments of the present invention, for example, the improvement is limited to the support. The choice of the material and the fixing method of the body 4, or the change of the position of the probe 9 of the getter 8 and the vacuum detecting unit, or the material, shape and function combination of the metal strip 2, the metal frame 5, and the metal plate 9 in the bottom plate And variations in the type of getter 8 still fall within the scope of the claims of the present invention.

Claims

Claim

1. A full vacuum flat panel solar collector comprising a solar heat exchanger and a chamber, characterized by:

a) the solar heat exchanger comprises a liquid inlet manifold and a liquid outlet manifold, and the inlet manifold and the outlet header communicate with each other by at least two heat absorbing tubes; a heat absorbing plate and each heat absorbing tube The heat absorbing surface is in close contact; the chamber is a vacuum chamber, the solar heat exchanger is placed in the vacuum chamber, and at least one end of the liquid inlet manifold and the liquid outlet manifold extend out of the vacuum chamber;

c) a support device is further disposed between the panel and the bottom plate, the support device is composed of a positioning bracket and a support body, and the positioning bracket is located between the panel and the bottom plate, and the support body is evenly distributed in the gap of the adjacent heat absorption tube Medium

e) The vacuum of the vacuum chamber is l^ X lO ^ X lO-Spao

2. The full vacuum flat panel solar collector according to claim 1, wherein: the heat absorbing plate is in close contact with the heat absorbing surface of each heat absorbing tube, and is: a heat absorbing plate and each heat absorbing tube. The heat absorbing surface is integrally fixed by welding, or the heat absorbing plate is integrally molded with each heat absorbing tube.

A full vacuum flat panel solar collector according to claim 2, wherein the actual thickness of the heat absorbing plate and the heat absorbing tube which are integrally or integrally molded by welding is less than 30 mm.

4. The full vacuum flat panel solar collector according to claim 1, wherein: the glass for the panel is a lead-free glass having high light transmittance, and the periphery of the glass is adhered to the metal strip by a low-melting glass. Integral; or the periphery of the glass is adhered to the metal strip with a low melting point metal solder after being coated;

5. The full vacuum flat panel solar collector according to claim 1, wherein: A section of metal strip extending beyond the glass contains an energy absorbing zone and a lands, the rim is located at the outer end of the strip, and the energy absorbing zone is located between the rim and the rim of the glass, and the energy absorbing zone is corrugated or creased .

A full vacuum flat panel solar collector according to claim 1, wherein: a getter or a vacuum detecting probe is placed in said vacuum chamber.

7. The full vacuum flat solar collector according to claim 6, wherein: the section of the processed metal frame has a hollow rectangular shape, and in the hollow rectangular section, the wall facing the vacuum chamber is provided with a gas groove or a gas hole. The probe of the getter or vacuum detecting unit is disposed in a rectangular hollow area.

The full vacuum flat solar collector according to any one of claims 1 to 7, characterized in that: an aluminum alloy frame is arranged around the full vacuum flat solar collector, and the profile of the aluminum alloy frame is " ] "The shape, the metal frame around the panel and the bottom plate are embedded in the aluminum frame.

9. The full vacuum flat panel solar collector according to claim 8, wherein: when the metal frame is embedded in the aluminum alloy frame, a heat insulating layer is disposed between the metal frame and the aluminum alloy frame.