CN201497203U

CN201497203U - Trough type solar collector

Info

Publication number: CN201497203U
Application number: CN2009202319321U
Authority: CN
Inventors: 张小松; 杨磊
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2009-09-14
Filing date: 2009-09-14
Publication date: 2010-06-02
Anticipated expiration: 2019-09-14

Abstract

A trough type solar collector comprises a heat collector and a trough type optical collector (4), wherein the heat collector comprises a glass vacuum tube (5) and a copper heating pipe (2) positioned therein, and the heat collector is placed with the trough type optical collector (4) in parallel and positioned in the position of a focal line of the trough type optical collector (4); the copper heating pipe (2) is provided with a curved fin (3) and welded into a whole with the curved fin (3), the other side of the curved fin (3) is closely stuck on the wall surface inside the glass vacuum tube (5), a heat-absorbent surface of inner layer glass of the glass vacuum tube (5) is coated with selective coating with high absorptivity and low emissivity, two pipe ends are closed, wherein a condensing side of the heating pipe is exposed outside the vacuum tube and extends into heat-absorbent working fluid; and the focused solar radiation energy is absorbed through the heating pipe welded with the curved fins, and the heat-absorbent working fluid is heated by adopting the mode of condensation to give out heat at the condensing end of the heating pipe.

Description

Trough type solar heat-collector

Technical field

The utility model is a kind of heat-pipe vacuum-tube to be used for solar energy heat collector on the slot-type optical collector, belongs to solar energy and utilizes category, the Salar light-gathering field.

Background technology

Solar energy is one of energy of greatest concern in the present new energy field, is all to obtain significant progress aspect utilization side heat or the generating in recent years.Solar electrical energy generation comprises two types of heat generating and photovoltaic generations, and wherein the solar energy thermal-power-generating technology is utilized solar energy heating heat absorption working medium, and then the driving generator for electricity generation, the electric energy that the sends use that is connected to the grid.Because it is higher to drive the needed working medium temperature of generator, generally adopt focus solar collector to collect solar radiation, be that working fluid of heat absorption reaches higher relatively temperature.Slot-type optical collector is combined into the optically focused array by the parabolic shape collective optics, and the optically focused mode is a line focus, can adopt the radiation of one dimension trace mode sun-tracing, temperature (200～400 ℃) in can obtaining.The metallic conduit that traditional slot light collection device will scribble coating for selective absorption is installed in glass pipe inside, places on the focal line position, and flowing in the metallic conduit has heat recipient fluid, is vacuum state between glass pipe and the metal tube.Because the hot expansibility difference of glass and metal is very big, there is very big difficult point in the sealing-in of the two on technology, cause processing cost higher.In addition, because metal pipe-wall can reach very high temperature, the stability of selective coating also is difficult to be guaranteed.

All-glass vacuum tube and copper heat pipe ripe already on the market are installed together as heat collecting pipeline, curved surface fin and heat pipe are welded as a whole, be fitted in the inner tubal wall of vacuum tube, not only can directly absorb solar radiation, also can obtain heat by the hot-air between heat pipe and the vacuum tube.The condensation end of heat pipe is in the working fluid of heat absorption, by condensation heat release heated working fluid.Heat pipe need not directly to contact with sealing-in place of glass-vacuum tube, and the joint difficulty of having avoided the thermal expansion coefficient difference owing to metal and glass to cause has been simplified manufacturing process, has reduced system's processing cost.In addition, selecting absorbing coating is not to be coated on the heat pipe, but is coated in the vacuum tube heat absorbing pipe shaft, and the high heat-exchanging performance of heat pipe makes tube wall temperature be unlikely to too high, and causes the unstable properties of selective coating.

Summary of the invention

Technical problem: the utility model proposes a kind of trough type solar heat-collector, absorb the solar radiant energy that focuses on, in heat pipe condensation end condensation heat release heating working fluid of heat absorption by the heat pipe that is welded with curved surface fin.Heat pipe need not to contact with glass-vacuum tube sealing-in place, and the joint difficulty of having avoided the difference owing to metal and thermal expansion coefficient of glass to cause has reduced processing cost.

Technical scheme: trough type solar heat-collector of the present utility model comprises heat collection body and slot-type optical collector, wherein, heat collection body is made up of glass-vacuum tube and the copper heat pipe that is positioned at glass-vacuum tube, the parallel placement with slot-type optical collector of heat collection body and being positioned on the focal line position of slot-type optical collector.

Copper heat pipe has the fin of curve form, the two is integrally welded, and the fin opposite side fitted tightly on the wall of the inside of glass-vacuum tube, the heat absorption surface of glass-vacuum tube inner layer glass scribbles the selective coating of high-absorbility low-launch-rate, the sealing of two pipe ends, the heat pipe condensation end exposes outside the vacuum tube pipe, extend in the working fluid of heat absorption.

One end of glass-vacuum tube is embedded in the conjugant of being made by insulation material and fixes, and the pipe shaft of glass-vacuum tube also passes this conjugant, and the outer condensation end of glass-vacuum tube places working fluid of heat absorption, and remainder then is positioned at vacuum tube inside.

Conjugant can be made by insulation material cheap, that be easy to obtain, with also fixing in the blind end reeve conjugant of vacuum tube near the heat pipe condensation end.Heat pipe itself also passes conjugant, to enter in the vacuum tube pipe except the part the condensation termination, and its condensation end placed among the working fluid of heat absorption, phase change medium absorbs solar radiation in the heat pipe in vacuum tube, phase transformation flashes to gas, converge in condensation end condensation heat release then, the heat that discharges is used for heated working fluid, makes it reach higher temperature.

To be placed on the focal line position of slot-type optical collector by the heat collecting pipeline that vacuum tube and heat pipe are formed jointly at last, constitute this trough-type vacuum tube heat collecting device of condenser heat tube.

Beneficial effect:

1, all-glass vacuum tube and heat pipe are the shaped article on the market, and be cheap, be easy to obtain;

2, adopt the welding of curved surface fin and heat pipe, the inner wall of easy and vacuum tube is fitted.Increase endotherm area, strengthened the ability that heat pipe directly absorbs solar radiation and absorb heat in the vacuum tube pipe the hot-air simultaneously;

3, adopt insulation material to make conjugant, sealing-in place of heat pipe and vacuum tube does not directly contact, and does not need highly difficult joint technology, has reduced cost.

4, the high heat-exchanging performance of heat pipe makes that the glass-vacuum tube tube wall temperature can be not too high and cause the unstable properties even the inefficacy of selective coating.

Description of drawings

Fig. 1 is the front view of the utility model trough type solar heat-collector, comprising conjugant 1, and copper heat pipe 2, curved surface fin 3, slot-type optical collector 4, glass-vacuum tube 5.

Fig. 2 is a vertical view of the present utility model.Fig. 3 is a left view of the present utility model.

The specific embodiment

Trough type solar heat-collector of the present utility model comprises heat collection body and slot-type optical collector 4, wherein, heat collection body is made up of glass-vacuum tube 5 and the copper heat pipe 2 that is positioned at glass-vacuum tube 5, and heat collection body is with slot-type optical collector 4 parallel placements and be positioned on the focal line position of slot-type optical collector 4.Copper heat pipe 2 has the fin 3 of curve form, the two is integrally welded, and fin 3 opposite sides are fitted tightly on the wall of the inside of glass-vacuum tube 5, the heat absorption surface of glass-vacuum tube 5 inner layer glasses scribbles the selective coating of high-absorbility low-launch-rate, the sealing of two pipe ends, the heat pipe condensation end exposes outside the vacuum tube pipe, extend in the working fluid of heat absorption.One end of glass-vacuum tube 5 is embedded in the conjugant of being made by insulation material 1 and fixes, and the pipe shaft of glass-vacuum tube 5 also passes this conjugant, and glass-vacuum tube 5 outer condensation ends place working fluid of heat absorption, and remainder then is positioned at vacuum tube inside.

This utility model can directly adopt the all-glass vacuum tube product ripe already on the current market and the ready-made heat pipe product of technology maturation to combine as heat collector.All-glass vacuum tube is vacuumized by double glazing, and closed at both ends forms, and scribbles the coating for selective absorption of high-absorbility low-launch-rate on the outer heat absorption surface of its inner layer glass, can significantly improve its heat absorption efficiency and reduces heat loss through radiation to the external world simultaneously.The space is filled with lower boiling phase change medium in copper heat pipe pipe, its evaporator section absorbs the solar radiation of focusing and the heat of the interior hot-air of vacuum tube pipe, phase change medium flashes to gas, gas converges in the condensation end condensation then, heat discharged to becoming liquid condition behind the working fluid again be back to evaporation ends again, working fluid is heated.The repetition that constantly circulates of this process, working fluid will be heated to higher temperature.Heat pipe has curved surface fin, and curved surface fin can be formed by straight aluminium or the direct bending of copper fin, then heat pipe is welded on the position of center line of curved surface fin, reduces the thermal contact resistance of the two as far as possible.The existence of curved surface fin has increased endotherm area, strengthens the ability that heat pipe directly absorbs solar radiation and absorb heat in the vacuum tube pipe the hot-air simultaneously.The copper heat pipe that will be welded with curved surface fin then is placed on all-glass vacuum tube inside, and the side and the vacuum tube inner tubal wall at fin place fitted tightly, and is easy to more conduct heat between the two.The high heat-exchanging performance of heat pipe makes that the glass-vacuum tube tube wall temperature can be not too high and cause the unstable properties even the inefficacy of selective coating.

Conjugant can be made by cheap insulation material, with also fixing in the blind end reeve conjugant of vacuum tube near the heat pipe condensation end.Heat pipe itself also directly passes conjugant, and except the condensation termination, remaining part all enters vacuum tube inside.The condensation end of heat pipe is placed among the working fluid of heat absorption, and the heat that the phase change medium in the heat pipe discharges in the condensation end condensation is used for heated working fluid, makes it reach higher temperature.

To be placed on the focal line of slot-type optical collector by the heat collecting pipeline that vacuum tube and heat pipe are formed jointly, just formed this trough-type vacuum tube heat collecting device of condenser heat tube.

Claims

1. A trough solar heat collector is characterized in that the device comprises a heat collector and a trough concentrator (4), wherein the heat collector consists of a glass vacuum tube (5) and a glass vacuum tube (5) Composed of copper heat pipes (2), the heat collector is placed parallel to the trough-type concentrator (4) and is located on the focus line of the trough-type concentrator (4).

2. The solar trough collector according to claim 1, characterized in that the copper heat pipe (2) has curved fins (3), the two are welded into one, and the fins (3) are additionally One side is closely attached to the inner wall of the glass vacuum tube (5), and the heat-absorbing surface of the inner glass of the glass vacuum tube (5) is coated with a selective coating with high absorption rate and low emissivity, the two tube ends are closed, and the heat pipe condensing end Expose the outside of the vacuum tube and extend into the heat-absorbing working fluid.

3. The trough solar collector according to claim 1, characterized in that one end of the glass vacuum tube (5) is embedded in the junction (1) made of thermal insulation material and fixed, and the tube of the glass vacuum tube (5) The body also passes through the joint body, the condensing end outside the glass vacuum tube (5) is placed in the heat-absorbing working fluid, and the rest is located inside the vacuum tube.