KR100449958B1 - Full-glassed vacuum type solar heat collectors with coaxial themosyphon stream line - Google Patents

Abstract

The present invention relates to a fully glass vacuum tube solar collector equipped with a coaxial thermosiphon flow passage, and more particularly, a coaxial thermosyphon specially designed inside a double-tube glass tube vacuum-treated between the tube and the tube. Charge the pipe having a flow path, and the space between the charged pipe and the collecting tube is filled with antifreeze, and the upper end of the collecting tube is equipped with a thermal expansion absorber for absorbing excessive thermal expansion of the antifreeze, preventing winter freezing and solar heat. It relates to a solar heat collecting device that can maximize the efficiency and economics of use.

Description

FULL-GLASSED VACUUM TYPE SOLAR HEAT COLLECTORS WITH COAXIAL THEMOSYPHON STREAM LINE}

The present invention relates to a fully glass vacuum tube solar collector equipped with a coaxial thermosiphon flow passage, and more particularly, a coaxial thermosyphon specially designed inside a double-tube glass tube vacuum-treated between the tube and the tube. Charge the pipe having a flow path, and the space between the charged pipe and the collecting tube is filled with antifreeze, and the upper end of the collecting tube is equipped with a thermal expansion absorber for absorbing excessive thermal expansion of the antifreeze, preventing winter freezing and solar heat. It relates to a solar heat collecting device that can maximize the efficiency and economics of use.

In general, solar collectors for solar use are classified into two types of flat panel and vacuum tube solar collectors in consideration of their external structure and applicability.

The most widely used flat panel solar collector is a rectangular flat plate, and the heat collecting plate has a special chemical treatment on the surface of the thin metal plate made of copper or aluminum to absorb the sunlight as much as possible. 31) was formed and welded to the surface of one side of the heat collecting plate 31, a plurality of thin paper tubes 32 (32 ') of the same material at regular intervals, inserted into a rectangular frame and covered with a transparent cover.

In the flat solar collector P as described above, a solar heat beam primarily heats the heat collecting plate 31, and a heat transfer medium (or water) transfers heat energy from the heated heat collecting plate 31 to the inside of the branch pipes 32 and 32 ′. Receives to join in the main building 33 of the upper flows to the heat storage tank 34 or heat exchanger.

The plate-type collector P may be used by directly heating water in the collector, but in an area where the cold weather is present, an antifreeze is used as a heat medium rather than water, and the antifreeze heated while passing through the collector heats the water secondarily. It is applied.

The flat plate collector (P) is mainly in a low temperature range, that is, 80 ?? The following solar heat is used, and even though a transparent cover is used on the top of the heat collecting plate 31, heat loss occurs a lot from the heat collecting plate 31 to the outside due to convection, and thus the heat collecting efficiency drops to about 50% or less. .

In addition, the vacuum tube solar collector V has a glass tube shape and is capable of blocking heat loss due to convection by vacuuming a closed space in contact with the solar collector surface. FIGS. 8 (a) and (b) As in, there is a method using one glass tube and two glass tubes in the form of a double vacuum tube.

In the method of using one glass tube, a heat pipe 42 having a heat collecting plate 43 mounted therein is inserted into the glass tube 41, and the heat pipe 42 is protruded and installed at an upper end of the glass tube 41. In the metal stopper 44 is sealed and the inside of the vacuum treatment to prevent the heat loss to the outside due to convection solar heat collected from the heat collecting plate 43 surface.

Vacuum tube solar collector (V) of the type described above requires a fairly complicated process due to the glass and metal bonding problem in sealing the upper end of the glass tube 41 with a metal stopper 44, resulting in durability And economics.

In addition, the vacuum tube-type solar collector (V), which uses two glass tubes in the form of a double vacuum tube, is a glass double tube vacuum-treated between the outer tube 45 and a special surface-treated collector tube 46 for solar heat collection. To form a heat medium (liquid, water, etc.) inside the heat collecting tube 46 and seal the upper portion of the double tube with a heat insulating plug 47 to heat the heat medium filled inside the heat collecting tube 46 to circulate heat energy. The vacuum between the outer tube 45 and the collecting tube 46 was vacuumed to block heat loss to the outside due to convection of air.

The above method does not have a problem in the production of the collector body, but if the heating medium (water) is filled directly into the heat collecting tube 46 and heated, if the water suddenly flows into the heat collecting tube 46 heated by the winter heat and cold weather and solar heat There is a problem that the heat collecting phenomenon of the heat collecting tube 46 is damaged due to thermal stress, and the material of the outer tube 45 and the heat collecting tube 46 is made of glass and is directly connected to the heat storage tank. If there is a risk that water in the heat storage tank leaks into the broken tube. In addition, since this method directly heats the water in the heat collecting tube 46, the heat capacity of the water has a large design problem in that the size of the heat collecting tube 46 is not increased to increase the heat collecting area.

In order to supplement the above problems, the solar heat is collected by using a glass double tube as in the case of FIG. 9 (a) and (b).

In the case of FIGS. 9A and 9B, the copper plate 48 is rolled into the collecting tube 46 and closely inserted into the inner surface of the collecting tube 46, and then the “U” -shaped copper tube 42 ′ or heat is inserted into the collecting tube 46. The method in which the pipe 42 is sandwiched between the collecting tube 46 and the inserted copper plate 48 is applied.

The method of inserting the copper plate 48 as shown in (a) and (b) increases the manufacturing cost with the complexity of using the system and the copper plate 48 and the "U" copper pipe 42 'or the heat pipe 42. There was a problem that the heat resistance is increased due to poor contact between the) and the heat collection efficiency is reduced thereby.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and a pipe having a specially designed coaxial thermosyphon flow path is inserted into a glass tube of a double structure in which a tube and a tube are vacuum-treated. The space between the charged pipe and the collecting tube is filled with antifreeze, and the upper part of the collecting tube is equipped with a thermal expansion absorber to absorb excessive thermal expansion of the antifreeze, thus preventing winter freezing and maximizing the efficiency and economic efficiency of using solar heat. The purpose is to make it.

In a solar heat collector using a double tube vacuumed between the outer tube and the collector tube painted black coating portion to the outer tube side to achieve the above object;

A screw stopper formed inwardly, and a fixed stopper tightly coupled to an upper end of the double glass collector using an O-ring under the formed screw part;

A hollow part is formed at the center of the locking step, and a plurality of air holes are formed in the middle of the outer surface, and the air holes are connected to a vent equipped with a piston which is moved up and down. A connecting member coupled to the glass collector while being sealed with an O-ring while being engaged with the screw,

O-ring is coupled to the outside of the upper end of the cold water flow pipe passing through the center of the connecting member and is equipped with a cold water flow pipe which is supported by a support so as to be located at the center without being in close contact with the bottom surface of the hot water flow pipe, the outer pipe is formed corrugated at the bottom The upper part of the hot water flow pipe is seated and inserted into the glass collector into which the antifreeze is injected.

A cold-water inflow pipe having an enlarged diameter in the center of the pipe connected to the heat storage tank to enable inflow and discharge of cold water and hot water is sealed with an O-ring to the cold water flow pipe mounted in the glass collector, and the bottom of the hot water discharge pipe O-rings attached to the outside are inserted into the locking jaws of the hollow formed in the center of the connecting member and then provided to be sealedly coupled, thereby minimizing thermal resistance since the antifreeze in the heat collecting tube is directly heated with the heating of the heat collecting tube. In addition, the present invention relates to preventing heat shock because the antifreeze that is a heat medium and ultimately the fluid (water, etc.) to be heated using solar energy are physically separated.

1 is a cross-sectional view of the present invention before combining the natural vacuum glass tube solar collector

Figure 2 is a cross-sectional view after combining the glass tube solar collector of the present invention natural circulation method

Figure 3 is a cross-sectional view before coupling the glass tube solar collector of the present invention forced circulation system

Figure 4 is a cross-sectional view after combining the glass tube solar collector of the present invention forced circulation system

5 is a perspective view of the connection member of the present invention;

Figure 6 is a perspective view of the present invention coupled member coupled to the glass collector

7 is a structural diagram of a conventional flat solar collector

Figure 8 (a) is a structural diagram of a conventional single vacuum tube solar collector

(b) is a structural diagram of a conventional double vacuum tube solar collector

9 (a) is a structural diagram of a double vacuum tube solar collector using the "U" magnetic tube

(b) is a structural diagram of a double vacuum tube solar collector using a heat pipe.

(1): heat storage tank (2): glass collector

(3): cold water flow pipe (4): hot water flow pipe

(5): antifreeze (6): fixed stopper

(7): O-ring (8): Thread

(9): connecting member (10): screw part

(11): air hole (12): piston

(13): Ventilation 14: O-ring

15: support 16: hot water discharge pipe

(17): O-ring 19: cold water

20: hot water 21: jam jaw

(22): hollow portion 23: O-ring

24: pleat 25: cold water inlet pipe

26: hot water pipe 27: cold water pipe

Referring to the configuration and operation of the present invention in detail with reference to the accompanying drawings as follows.

1 is a cross-sectional view before coupling the glass tube solar collector of the present invention natural circulation method,

Figure 2 is a cross-sectional view after combining the glass vacuum tube solar collector of the present invention natural circulation method,

Figure 3 is a cross-sectional view before coupling the glass tube solar collector of the present invention forced circulation system,

Figure 4 is a cross-sectional view after combining the glass tube solar collector of the present invention forced circulation system,

5 is a perspective view of the connection member of the present invention,

6 is a perspective view showing a state in which the connection member of the present invention is coupled to a glass collector.

A solar collector using a double tube vacuumed between an outer tube and a collecting tube painted with a black coating on the outer tube side;

A screw stopper (8) formed inward, and a fixed stopper (6) which is tightly coupled to an upper end of the double glass collector (2) by using an O-ring (7) in the lower part of the screw (8),

A hollow portion 22 is formed in the center of the engaging jaw 21, a plurality of air holes 11 are formed in the middle of the outer surface, the air hole 11 is a piston 12 to move up and down It is connected to the mounted vent (13), the bottom surface is formed with a screw portion 10 is engaged with the screw portion (8) formed on the fixed stopper (6) while being coupled to the glass collector (2) sealed with an O-ring (14) Connecting member 9,

O-ring 17 is coupled to the outside of the upper end of the cold water flow pipe (3) passing through the center of the connecting member (9) and is positioned in the center without being in close contact with the bottom surface of the hot water flow pipe (4) The upper part of the hot water flow pipe 4, which is an outer pipe having a cold water flow pipe 3 supported thereon and having a wrinkle 24 formed thereon, is seated and then inserted into the glass collector 2 into which the antifreeze 5 is injected.

Cold water inlet pipe 25 mounted on the glass collector 2 has a cold water inlet pipe 25 having an increasing diameter in the center of the pipe 16 connected to the heat storage tank 1 to allow cold water and hot water to be introduced and discharged. The locking jaw 21 of the hollow part 22 formed at the center of the connection member 9 by an O-ring 23 attached to the bottom of the hot water discharge pipe 16 and coupled to the bottom of the hot water discharge pipe 16. It is composed of inserting to) and then sealingly combined.

The operation of the present invention is as follows.

The threaded portion 8 is formed inward, and the fixing stopper 6 having the O-ring 7 attached to the lower portion of the formed threaded portion 8 is attached to the double glass collector 2 in close contact with the upper end thereof.

A connection member 9 is coupled to the fixing stopper 6, and the connection member 9 has a hollow portion 22 formed at a center thereof, and a locking jaw 21 is formed at an inner circumferential surface of the hollow portion 22. It is.

In addition, a plurality of air holes 11 are formed in the middle of the outer surface, and the air holes 11 are connected to the air vents 13 serving as cylinders on which the pistons 12 which are moved up and down are mounted.

Looking at the role of the piston 12 and the air hole 11 mounted on the vent 13 serving as the cylinder when the glass collector 2 is heated by solar energy, the temperature of the antifreeze 5 rises, As the antifreeze 5 expands, the pressure in the glass collector 2 rises, pushing the piston 12 mounted to the air vent 13 upwards, whereby the pressure in the glass collector 2 filled with the antifreeze is kept constant. It is to be maintained to prevent breakage of the glass collector (2).

That is, when the antifreeze 5 is cooled, the piston 12 is lowered as it is, and the side wall of the air vent 13 serving as a cylinder has a pressure inside the air vent 13 through which the air flows in and out through the air hole 11 at all times. It will be able to maintain atmospheric pressure.

The number of the air holes 11 is determined according to the amount of the antifreeze 5.

An o-ring 14 is formed on the bottom of the connecting member 9 to form a threaded portion 10 engaged with the threaded portion 8 formed on the fixing stopper 6 and to be sealed when engaged with the glass collector 2 inwardly. ) To combine.

O-ring 17 is coupled to the outside of the upper end of the cold water flow pipe (3) passing through the center of the connecting member (9) and is positioned in the center without being in close contact with the bottom surface of the hot water flow pipe (4) The cold water flow pipe (3), which is supported, is mounted on the upper part of the hot water flow pipe (4), which is an outer pipe having a pleat (24) formed thereon, and then inserted into and fixed in the glass collector (2) into which the antifreeze (5) is injected. will be.

The support 15 is formed in a spiral shape so that the hot water 20 passes and flows.

The pipe structure connected to the heat storage tank 1 coupled to the structure made as described above has a diameter in the center of the pipe 16 connected to the heat storage tank 1 to enable the inflow of the cold water 19 and the discharge of the hot water 20. An increasingly large cold water inflow pipe 25 is coupled to the cold water flow pipe 3 mounted in the glass collector 2 while being sealed with an O-ring 17, and an O-ring attached to an outer side of the bottom of the hot water discharge pipe 16. 23 is inserted into the locking jaw 21 of the hollow portion 22 formed in the center of the connecting member 9 is to be coupled to seal with the O-ring (23).

The cold water inflow pipe 25 charged into the heat storage tank 1 is located at the lower surface of the heat storage tank 1, and the cold water 19 is converted into hot water 20 while passing through the glass heat collector 2, thereby storing the heat storage tank 1. The end of the pipe 16 for discharging the warm water 20 into is installed so as to be located above the center of the heat storage tank 1 to enable natural circulation of the fluid by the density difference. Looking at the operating state of the glass collector (2) having the structure as described above, when the solar energy is irradiated to the collecting tube of the glass collector (2) during the sunshine hours, the outer surface of the inner glass tube of the black glass of the double glass tube constituting the collecting tube is It will be heated.

Due to this, the antifreeze 5 is primarily heated, and the warmed antifreeze 5 flows back into the hot water flow pipe 4, which is an outer flow passage contacting the antifreeze 5 in the coaxial thermosyphon flow passage. The cold water (19) is reheated to make hot water (20).

At this time, the difference in density occurs between the cold water 19 flowing in the cold water flow pipe 3 located in the inner center of the hot water flow pipe 4 and the hot water 20 flowing in the hot water flow pipe 4. It causes a phenomenon called (Thermosyphon), which helps the forward flow of fluid (water).

The forward flow here means that the fluid in the hot water flow pipe 4, which is the outer flow path, flows upwards and the fluid of the cold water flow pipe 3, which is the inner flow path flows downwards.

Meanwhile, the antifreeze filled in the space between the pipe and the collecting tube of the coaxial thermosyphon flow path expands in volume as the temperature rises, thereby increasing the pressure in the collecting tube. The piston 12, which is an installed thermal expansion absorber, ascends to absorb the pressure to suppress excessive pressure rise in the heat collecting tube, thereby naturally changing the cold water 19 in the heat storage tank 1 to hot water 20 using solar energy. Will be.

As shown in FIGS. 1 and 2, the coaxial thermosyphon flow pipe has a natural circulation, so that the wall between the two flow paths is thermally operated so as to minimize the heat transfer of the cold water in the inner flow path and the hot water in the outer flow path. It should be treated with insulation so that it does not pass through well, and the pipe forming the inner passage should be made of a material having poor thermal conductivity.

On the other hand, the outer pipe constituting the outer wall of the outer passage should be made of a material having good thermal conductivity so that water can be easily heated while flowing along the outer passage.

3 and 4 shows a heat collecting device to which the principle of the present invention is applied in a solar type solar collector (fluid forced circulation solar collector) in which a fluid is forcedly circulated through a pump as shown in FIG. By connecting the hot water discharge pipe 16 and the cold water inlet pipe 25 directly to the 26 and the cold water pipe 27, the solar heat primarily heats the antifreeze, and the warmed antifreeze flows through the coaxial thermosyphon flow path. It is made to reheat the water flowing along the outer channel.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Therefore, the present invention charges a pipe having a specially designed coaxial thermosyphon flow path inside a double-tube glass tube vacuum-treated between the tube and the tube, and the space between the charged pipe and the collecting tube is an antifreeze. Filled with, the upper end of the heat collecting tube is equipped with a thermal expansion absorbing device for absorbing excessive thermal expansion of the antifreeze is the invention that has the effect of maximizing the efficiency and economic efficiency of solar heat as well as preventing freezing in winter.

Claims (4)

A solar collector using a double tube vacuumed between an outer tube and a collecting tube painted with a black coating on the outer tube side; A screw stopper (8) formed inward, and a fixed stopper (6) which is tightly coupled to an upper end of the double glass collector (2) by using an O-ring (7) in the lower part of the screw (8), A hollow portion 22 is formed in the center of the engaging jaw 21, a plurality of air holes 11 are formed in the middle of the outer surface, the air hole 11 is a piston 12 to move up and down It is connected to the mounted vent (13), the bottom surface is formed with a screw portion 10 is engaged with the screw portion (8) formed on the fixed stopper (6) while being coupled to the glass collector (2) sealed with an O-ring (14) Connecting member 9, O-ring 17 is coupled to the outside of the upper end of the cold water flow pipe (3) passing through the center of the connecting member (9) and is positioned in the center without being in close contact with the bottom surface of the hot water flow pipe (4) The upper part of the hot water flow pipe 4, which is an outer pipe having a cold water flow pipe 3 supported thereon and having a corrugation 24 formed thereon, is seated and then inserted into the glass collector 2 into which the antifreeze 5 is injected. Cold water inlet pipe 25 mounted on the glass collector 2 has a cold water inlet pipe 25 having an increasing diameter in the center of the pipe 16 connected to the heat storage tank 1 to allow cold water and hot water to be introduced and discharged. The locking jaw 21 of the hollow part 22 formed at the center of the connection member 9 by an O-ring 23 attached to the bottom of the hot water discharge pipe 16 and coupled to the bottom of the hot water discharge pipe 16. A fully glass vacuum tube solar collector equipped with a coaxial thermosiphon flow passage, characterized in that it is configured to be sealed after the insertion. The method of claim 1, The cold water inflow pipe 25 charged into the heat storage tank 1 is located at the lower surface of the heat storage tank 1, and the cold water 19 turns into hot water 20 while passing through the glass heat collector 2 and into the heat storage tank 1. The end of the pipe 16 for discharging the hot water 20 is installed so as to be located in the upper center of the heat storage tank (1) so that the natural circulation of the fluid by the difference in density is equipped with a coaxial thermosiphon flow path Glass tube solar collector. The method of claim 1; The pressure inside the vent (13) is a full glass vacuum tube solar collector equipped with a coaxial thermosiphon flow path, characterized in that the air flows in and out through the air hole (11) to maintain the atmospheric pressure at all times. The method of claim 1; The shape of the pipe into which cold water flows from the heat storage tank (1) is characterized in that a small pipe is installed in a large diameter pipe so as to have a concentric cross-sectional area.