KR100779428B1 - Solar collector with reflector and double-sided coating to collect solar thermal - Google Patents

Abstract

     The present invention relates to a solar heat collector comprising a heat medium flow tube and a heat collecting plate in a glass tube. And attaching a heat-collecting coating solar absorbing plate to the upper side for solar heat collection on the upper side of the heat pipe to absorb solar heat from the upper side, and installing a reflecting plate on the lower side of the collector to reflect or absorb solar heat. At the same time, a heat collecting coating is applied to the lower surface of the solar heat absorbing plate to heat the working fluid in the heat pipe to form an evaporation part in the heat pipe, and to form a condensation part in a manifold mounted on the upper side in the longitudinal direction of the heat pipe. Double-sided nose designed to dissipate heat from the working fluid in the heat pipe Ting absorption plate solar collector, and another embodiment is to provide a common pipe as a heat medium flow tube.

The present invention is to coat the upper side and the lower side of the heat collecting plate in a double, including the components of the solar heat directly incident on the upper side of the heat collecting plate, by installing a reflector on the rear side of the heat collector to collect the reflected components to improve the heat collection efficiency It is to provide a collector. In addition, by absorbing through both sides of the heat collecting plate, even if a small number of collectors are installed in the same heat collecting area, it is possible to absorb all solar radiation incident on the heat collecting area.

Vacuum Tube Solar Collector, Collector, Absorber, Reflector

Description

Double-side coating absorber solar collector {SOLAR COLLECTOR WITH REFLECTOR AND DOUBLE-SIDED COATING TO COLLECT SOLAR THERMAL}

1 is a schematic view showing a solar collector according to the prior art.

Figure 2 is a schematic diagram showing an inclined solar collector according to the prior art.

3 is a schematic view showing a solar collector according to the present invention.

<Brief description of symbols for the main parts of the drawings>

1: Manifold 2: Heat medium flow tube

3: solar heat absorber 4: glass tube

5: solar collector 6: reflector

The present invention relates to a solar heat collector comprising a heat medium flow tube and a heat collecting plate in a glass tube. And attaching a heat-collecting coating solar absorbing plate to the upper side for solar heat collection on the upper side of the heat pipe to absorb solar heat from the upper side, and installing a reflecting plate on the lower side of the collector to reflect or absorb solar heat. At the same time, a heat collecting coating is applied to the lower side of the solar absorbing plate to heat the working fluid in the heat pipe to form an evaporation part in the heat pipe, and to form a condensation part in a manifold mounted on the upper side with respect to the longitudinal direction of the heat pipe. Both sides designed to dissipate heat from the working fluid in the heat pipe It relates to a floating absorbing plate solar collector, to a different embodiment examples of the heating medium flow pipe, to install a conventional pipe.

The most important point in the use of the solar energy, which is an unlimited energy source, is the high efficiency of the solar collector, and this high efficiency has been achieved to some extent by applying vacuum technology together with the heat pipe, which is a high efficiency heating element.

However, if the solar energy can be efficiently collected and not properly delivered, the high efficiency collector becomes useless. The problem of transferring the collected heat energy to the water heater through the heat medium flow pipe without heat loss in the use of solar energy It is another important variable that determines the overall energy use efficiency.

Recently, in obtaining energy, environmental pollution due to exhaustion of resources and combustion of fossil dyes has emerged as a serious problem. Accordingly, the importance of securing alternative energy sources has been highlighted, and its development is being actively conducted in major developed countries.

      Examples of the development of alternative energy sources include power generation using solar, wind, wave, geothermal and the like. Of these, the power generation using the wind power, wave power, geothermal heat has a disadvantage that the installation place for the generator is limited to a specific location.

On the other hand, the power generation using the solar heat is relatively difficult to the location conditions, there is an advantage that can be installed in the building and the like.

The solar power generation as described above is largely divided into a condensing type and a non-condensing type. Again, the non-condensing type is largely divided into a plate type and a vacuum tube type. Among them, it is recognized as the most suitable for the present industrial use, and the spotlight is the vacuum tube solar collector.

      The vacuum tube solar collector is largely composed of a heat collecting plate, a vacuum glass tube, a heat pipe, and a manifold.

1 is a schematic view showing a solar collector according to the prior art, the vacuum tube-type solar collector (5) is a high-efficiency heat transfer to receive heat from the heat-absorbing coated solar heat absorbing plate (3) only to the upper side to collect the solar heat, heat transfer It consists of a heat pipe, which is an element, and a solar heat absorbing plate 3 and a vacuum glass tube 4 incorporating a heat pipe in a vacuum state in order to minimize heat loss.

Figure 2 is a schematic diagram showing a solar collector inclined according to the prior art, the manifold (1) in which the working fluid inside the heat pipe of the vacuum tube solar collector (5) is vaporized by the solar heat absorbed by the evaporator, the heat medium circulates The heat is transferred to the condensate with condensation, condensed, returned to the evaporator by the gravitational field, and evaporated again to form a cycle.

As shown in Fig. 2, most solar collectors using heat pipes are installed while maintaining an appropriate inclination angle between the direction of the gravitational field and the direction perpendicular to the gravitational field. This inclination angle has a significant effect on the heat collection efficiency in the heat collector, in which the heat absorbed by heat pipes, in particular, heat siphon, is transferred.

This is especially because the boiling heat resistance varies depending on the shape in which the working fluid returning to the evaporator is distributed on the wall of the pipe vessel. This non-uniform distribution also promotes the dry-out limit, a form of heat transfer limit in heat pipes, which can lead to a situation where no more absorbed solar heat can be transferred at higher solar radiation levels. Therefore, the heat pipe (heat siphon) is attached to the heat collecting plate proposed here, the heat transfer path between working fluids vaporized by absorbed solar heat is reduced to the shortest distance to improve the heat collection efficiency and heat transfer according to the inclination angle. Performance (dry-out limit, etc.) is not significantly affected.

      The heat collecting plate has a predetermined area to collect solar energy, and the heat pipe is bonded to the heat collecting plate while the working fluid is filled therein so that heat of the solar energy collected through the heat collecting plate can be absorbed into the internal working fluid. Make sure In addition, the vacuum glass tube surrounds the heat pipe and the heat collecting plate to form a vacuum in the space in which the heat pipe and the heat collecting plate are accommodated.

      The vacuum tube solar collector as described above is highly secured and the heat transfer efficiency between the heat collecting plate and the working fluid inside the heat pipe is important. In addition, the core of the operation of the tube-type solar collector is the collection of solar energy, the heat collecting performance and efficiency of the heat collecting plate is the most important.

      However, in the case of the conventional single-tube solar collector as described above, the coating is considered in consideration of only one side where the solar radiation is directly incident, so that the radiation reflected or refracted and incident on the opposite side is not considered, and thus the heat collection capacity is significantly reduced. There was a problem.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and a reflecting plate is installed on the lower side of the collector to absorb the reflected solar heat, and is provided on the lower side of the solar absorbing plate coupled with the heat pipe to absorb the reflected solar heat. In order to provide a double-side coating absorbing plate solar collector configured to be a heat-collecting coating treatment, when the heat collecting plate is coated on both sides, the solar radiation is reflected or refracted directly or indirectly is also considered to improve the heat collecting efficiency.

     In order to increase the heat collection effect, the effect of receiving indirectly reflected solar radiation is reflected by using a reflector. In general, in the case of solar radiation passing through the heat collecting plate, it depends on the property of the reflecting surface. Light is reflected or reflected, but rarely is the focus of the heat sink.

Therefore, by installing a reflector on the back of the solar collector, the focal point is designed to uniformly irradiate the back of the collector plate, so as to provide a solar collector with high efficiency collector performance by absorbing direct sunlight and reflecting back the components that are deflected. .

Next will be described in detail with respect to the double-side coating absorbing plate solar collector according to the present invention with reference to the accompanying drawings.

Figure 3 is a schematic diagram showing a solar collector according to the present invention, when described in detail with respect to the present invention,

A solar heat collector comprising a heat medium flow tube and a heat collecting plate in a glass tube, wherein a heat pipe is positioned in the glass tube 4 so that a heat pipe is located, and the solar heat is collected on the upper side of the heat pipe to absorb solar heat from above. Attaching the heat-collecting coated solar absorber plate (3) on the upper side, and installing the reflector plate (6) on the lower side of the collector to reflect or absorb the solar heat, and the heat-collecting coating treatment on the lower side of the solar absorber plate To heat the working fluid in the heat pipe to form an evaporation part in the heat pipe, and to form a condensation part in the manifold 1 mounted on the upper side in the longitudinal direction of the heat pipe, thereby dissipating heat of the working fluid in the heat pipe. It relates to a double-side coating absorber plate solar collector made to.

In the case of the conventional single tube solar collector, since the solar coating is treated with a heat collecting coating considering only one side of the heat collecting plate, the radiation is reflected or refracted and the radiation incident on the opposite side is not considered. .

In the present invention is coated on both sides of the heat collecting plate, so that the heat collection efficiency is further improved, including solar radiation is reflected or refracted by direct or indirect solar heat.

To this end, it is to have the effect of directly receiving the solar radiation that is indirectly reflected and incident using a reflector.

     In general, solar radiation passing through the heat collecting plate depends on the property of the reflecting surface, but most of it is absorbed or reflected, but it is rarely focused on the heat collecting plate. Therefore, by installing a reflector plate designed to uniformly irradiate the rear surface of the heat collecting plate on the back of the solar heat collector, it directly absorbs the solar radiation and reflects and collects the non-reflecting components again, thereby exhibiting high efficiency heat collecting performance.

      In another embodiment of the present invention, in a solar heat collector including a heat medium flow tube and a heat collecting plate in a glass tube, a heat pipe (2) in the glass tube (4) is located, and a conventional pipe is positioned to absorb the solar heat from the upper side. Attached to the upper side of the solar heat collecting plate (3) coated with a heat-collecting coating on the upper side for solar heat collection, to heat the working fluid in the pipe, reflecting the pipe or reflector on the lower side of the collector to absorb solar heat (6) and at the same time the heat absorbing coating on the lower surface of the solar absorbing plate, and a double-coated absorbing plate solar collector made to heat the working fluid in the pipe.

In the case of the solar collector using the heat pipe shown in FIG. 3, heat is supplied indirectly by using heat from the condensation unit in the heat pipe, while in another embodiment of the present invention, a heat medium flow tube is generally used. By using the pipe of, using the solar heat to heat the working fluid in the pipe, to supply it to the place where it is needed, or to use indirectly.

In the case where the heat medium flow tube is a heat pipe in the glass tube, due to the thermal characteristics of the heat pipe, the solar collector including the heat pipe is vertically formed or has an inclination angle with respect to the vertical. This is to allow the evaporated working fluid in the heat pipe to flow upward, and the condensed working fluid to flow downward.

On the other hand, in the case where the heat medium flow tube is a conventional pipe in the glass tube, any of the solar heat collectors may be freely installed and vertically formed or installed at an inclined angle or horizontal angle with respect to the vertical. Is selected.

The reflector 6 is installed on the rear of the heat collector and reflects or refracts indirectly, and is installed to improve the heat collecting efficiency, so that the reflector 6 has a circular curved shape in the same direction as the glass tube 4, or a horizontal plane. It is to maintain the shape. In the case of a circular curved shape, indirect solar heat can be efficiently collected rather than a horizontal plane, and the horizontal plane is used in consideration of convenience of field installation.

In addition, the inside of the glass tube 4 is to be formed in a vacuum state, to use the solar heat more effectively.

Double-coated absorber plate solar collector according to the present invention is a reflector plate designed to uniformly irradiate the back surface of the heat collecting plate in order to improve the heat collecting efficiency in consideration of the solar radiation is incident or reflected or refracted by direct or indirect reflection of the heat collecting plate on both sides By installing the solar collector on the back of the solar absorber directly absorbs the solar radiation at the same time reflecting the components that are deflected to collect the Taeyoung heat collector exhibiting high efficiency of the heat collection performance.

Claims (6)

In the solar heat collector (5) comprising a heat medium flow tube and a heat collecting plate in a glass tube, As the heat medium flow tube 2 in the glass tube 4, a heat pipe is located, and a heat-collecting coated solar absorbing plate 3 for solar heat collection is attached to an upper side of the heat pipe to absorb solar heat from the upper side, The reflector 6 is installed on the lower side of the collector 5 so as to absorb the reflected or refracted solar heat, and at the same time, a heat collecting coating is applied to the lower side of the solar absorber to collect a large amount of solar heat directly or indirectly. The working fluid in the heat pipe is heated to form an evaporation part in the heat pipe, and a condensation part is formed in the manifold 1 mounted on the upper side with respect to the longitudinal direction of the heat pipe to release heat of the working fluid in the heat pipe. The solar collector is formed vertically or has an inclination angle with respect to the vertical, and the reflecting plate 6 is the same as the glass tube 4. Or a circularly curved shape of the face, the double-sided coating absorbing plate solar collector characterized in that the interior of the selectively formed in the shape of a horizontal plane, and the glass tube (4) is formed in a vacuum state. In the solar heat collector (5) comprising a heat medium flow tube and a heat collecting plate in a glass tube, As the heat medium flow tube 2 in the glass tube 4, a normal pipe is located, and a solar heat absorbing plate 3 having a heat-collecting coating on the upper side for solar heat collection on the upper side of the pipe to absorb solar heat from the upper side is provided. Attaching, heating the working fluid in the pipe, and installing a reflecting plate 6 on the lower side of the collector 5 so as to reflect the pipe or absorb solar heat, and at the same time, a heat collecting coating on the lower side of the solar absorbing plate. A large amount of solar heat is collected directly or indirectly, and heats the working fluid in the pipe, wherein the solar collector is formed vertically, formed at an inclination angle with respect to the vertical, or formed at a horizontal angle. Branches may be selectively formed, and the reflecting plate 6 may have a circular curved shape in the same direction as the glass tube 4 or may have a horizontal surface shape. And optionally formed, wherein the inside of the glass tube 4 is formed in a vacuum state. delete delete delete delete

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