KR100512809B1 - Solar heat collectors using full-glassed u type vacuum pipe with annulus sealing device - Google Patents

Abstract

The present invention penetrates the metal tubes having good thermal conductivity to the inside of the solar heat collector by using two glass vacuum pipes formed with corrugated pipes, which are sealing devices 3, and the lower end of each metal pipe is covered with a heat insulating material 15. Connected with an elastic corrugated pipe to form a "U" -shaped flow path 11, the upper end of one side is positioned so as to be close to the bottom surface of the heat storage tank (7a) so that the cold water inside the heat storage tank (7a), the other top of the heat storage tank ( It is located far from the bottom of 7a) at the location where hot water in the heat storage tank 7a is located, and the antifreeze filled inside the glass pipe is heated by solar energy, and the cold water introduced from the heat storage tank is heated to turn into hot water. To the solar collector of a fully glass "U" shaped vacuum pipe with an annular seal, which is configured to be re-flowed It is about.

Description

SOLAR HEAT COLLECTORS USING FULL-GLASSED U TYPE VACUUM PIPE WITH ANNULUS SEALING DEVICE}

FIELD OF THE INVENTION The present invention relates to a solar collector of an all-glass “U” shaped vacuum pipe with an annular sealing device, more specifically a small diameter glass pipe specially coated with a constant thickness to the outer surface inside and large diameter. The pipe is vacuum-insulated on the outside and sealed at both ends, and the problem caused by the different thermal expansion between the inner glass pipe and the outer glass pipe is cut in part of the outer pipe along its outer circumference and specially designed to the incision. It is related to the structure of the solar heat collecting device which can maximize the efficiency and applicability of solar heat as well as thermal efficiency while maximizing the efficiency and applicability of solar heat by combining the corrugated pipe of metal material in winter. .

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 a heat collecting plate having a special chemical treatment on the surface of the thin metal plate made of copper or aluminum as shown in FIG. 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 mainly uses solar heat of a low temperature range, that is, 80 ° C. or less, and heat loss from the heat collecting plate 31 to the outside due to convection from the heat collecting plate 31 is large. There was a problem such that the heat collection 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. 2A and 2B. 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 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. 3 (a) and (b).

In the case of FIGS. 3A and 3B, the copper plate 48 is rolled into the collecting tube 46 and inserted into and adhered to the inner surface of the collecting tube 46. 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.

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.

The present invention has been made to solve such a conventional problem, and by effectively applying an antifreeze or various devices (coating) to the inner surface of the inner glass pipe, there is no need to worry about freezing in winter, the production of heat pipe or copper plate Alternatively, it eliminates the hassle of inserting and adhering the “U” type copper tube into the collecting tube, and the antifreeze in the collecting tube is heated directly with the heating of the collecting tube, thereby minimizing thermal resistance and Ultimately, since the fluid (water, etc.) to be heated using solar energy is physically separated, no heat shock occurs, and even if the heat collecting tube is partially damaged, the effect of the heat resistance is increased so that the whole system does not have a significant effect. To overcome the degradation of the heat collection efficiency There is a purpose.

In order to achieve the above object, a hollow portion is formed at the center while having a vertically constant length, and a coating portion having a constant thickness is formed on the outer surface of the inner glass pipe which is integrally connected and separated at regular intervals. In the solar heat collecting device that can be cut to a certain length in a ring shape, and configured to combine the elastic corrugated pipe with the cut portion to prevent freezing during winter and maximize the efficiency and applicability of solar heat. It is about.

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

4 is an overall configuration diagram of a glass vacuum pipe having a corrugated pipe of the present invention bonded to a “U” -shaped flow path.

Two glass vacuum pipes having corrugated pipes, which are sealing devices 3, are used to penetrate through the metal tubes having good thermal conductivity inside to collect solar heat, and the lower end of each metal tube is a flexible corrugated pipe coated with a heat insulator 15. Connected to form a "U" -shaped flow path 11, the upper end of one side is positioned to be close to the bottom surface of the heat storage tank (7a) so that the cold water inside the heat storage tank (7a), the other top of the heat storage tank (7a) It is located far away from the bottom and placed in the place where hot water in the heat storage tank 7a is located. The antifreeze filled inside the glass pipe is heated by solar energy, and the cold water introduced from the heat storage tank is heated to become hot water and flows back into the heat storage tank. Configured to be

The operation of the present invention is as follows.

When the solar energy is irradiated to the collector during the sunshine hours, the inner surface of the glass pipe with black specially coated coating part is formed to have a constant thickness as a selective absorption film among the double glass pipes constituting the collector. The entire glass pipe is heated, which heats up the facility or the filled heat medium installed in the empty space inside the inner glass pipe.

The coating is painted black and the inner side glass pipe acts as a collecting tube.

The facility or filled heating medium is an antifreeze.

At this time, even if a significant temperature difference occurs between the heated inner side glass pipe and the outer side glass pipe formed integrally, the heat exchange between the two pipes is insignificant since the empty space between the two glass pipes is treated in a vacuum state. The heat loss to the outside is also reduced by more than 50% compared to the current flat solar collector.

On the other hand, the temperature difference between the inner glass pipe and the outer glass pipe may cause thermal stress between the inner glass pipe and the outer glass pipe due to the difference in thermal expansion of the two glass pipes in the longitudinal direction. The possibility of cracking at both ends of the pipe connection remains.

The present invention is to cut a portion of the outer side glass pipe in a ring shape along the outer circumferential surface in order to suppress this, and the cut portion is a specially designed sealing device (3) of the metallic material to be integrally fused and mounted to the outer side glass pipe will be.

The sealing device (3) is made of a corrugated pipe shape and the material is a synthetic resin coated with a surface so that the metal and the watertight is maintained.

This aims to ensure that the thermal expansion in the longitudinal direction by the temperature difference is equal.

In other words, by sealing a part of the outer glass pipe with a material of a metal and a synthetic resin which can shrink and expand while being sealed, even if a temperature difference occurs between the two glass pipes, it shrinks or expands to the same extent in the longitudinal direction. By doing so, the thermal stress between the inner glass pipe and the outer glass pipe is essentially eliminated.

Referring to the embodiment in which the glass pipe having the structure and shape as described above is installed in the heat storage tank, solar heat is collected by using two glass vacuum pipes in which a corrugated pipe, which is the sealing device 3 of the present invention, is formed as shown in FIG. 4. The metal pipes having good thermal conductivity penetrate into the inner side, and the lower end of each metal pipe is connected to the elastic corrugated pipe covered with the heat insulating material 15 to form a "U" -shaped flow path 11, and the upper end of one side of the heat storage tank ( 7a) positioned so as to be close to the bottom surface of the heat storage tank (7a) so that the cold water from the inside, and the upper end of the other side is located away from the bottom surface of the heat storage tank (7a) in a position where the hot water in the heat storage tank (7a) is located. The antifreeze filled inside the glass pipe is heated by solar energy, and the cold water introduced from the heat storage tank is heated to be converted into hot water and regenerated into the heat storage tank. In the heat storage tank (7a), the cold water is lower in density and the condensation phenomenon of hot water is lower in density, and the hot water is lower in density than the heat storage tank (7a). It flows naturally into the flow path 11 through the left metal pipe. Referring to FIG. 4, the metal tube and the flow path 11 receive pressure acting downward from the metal tube in which the cold water of high density on the left side is located, and simultaneously receive pressure acting upward in the metal tube of the low density hot water on the right side. As a result, in the metal pipe and the flow path 11, the pressure descends from the left side to the bottom and passes through the flow path 11 and rises to the upper right side. The cold water flowing into the metal pipe flows first in the first vacuum pipe on the left side. The metal pipe and the right side metal pipe in which the hot water above the heat storage tank 7a are positioned by the pressure difference acting in the metal pipe and the flow path 11 while being heated and being heated secondly in the second vacuum pipe through the flow path 11. It is pushed to the end. The hot water thus discharged is mixed with cold water at the bottom by convection in the heat storage tank 7a to heat the water.

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, in the present invention, the solar collector using the all-glass vacuum glass pipe in which the sealing device, which is a corrugated pipe, is fused and bonded, is considerably superior to the conventional all-glass vacuum tube solar collector, and has various forms of solar heat system. This is an invention that has the effect of improving the efficiency and convenience of using solar power.

1 is a structural diagram of a conventional flat solar collector

Figure 2 (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

Figure 3 (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

Figure 4 is an overall configuration of the glass vacuum pipe formed in the corrugated pipe of the present invention coupled to the "U" -shaped flow path

<Description of the symbols for the main parts of the drawings>

(3): sealing device (5): antifreeze

(7a): heat storage tank 11: "U" -shaped flow path

15: insulation

Claims (1)

Two glass vacuum pipes with corrugated pipes, which are sealing devices 3, are used to penetrate the metal tubes having good thermal conductivity inside the solar heat collector, and the lower end of each metal tube is a flexible corrugated pipe coated with a heat insulator 15. Connected to form a "U" -shaped flow path 11, the upper end of one side is positioned to be close to the bottom surface of the heat storage tank (7a) so that the cold water inside the heat storage tank (7a), the other top of the heat storage tank (7a) It is located far away from the bottom and placed in the place where hot water in the heat storage tank 7a is located. The antifreeze filled inside the glass pipe is heated by solar energy, and the cold water introduced from the heat storage tank is heated to become hot water and flows back into the heat storage tank. A solar glass collector of an all-glass “U” shaped vacuum pipe with an annular sealing device, characterized in that it is configured to be capable of forming an air column.