KR20170103261A - A manifold for increasing a heat transfer efficiency in a solar collectors - Google Patents

Abstract

The present invention relates to a solar collector having a manifold increasing heat transfer efficiency. More specifically, a pattern having set depth and a set angle is formed on a surface of the manifold to increase a heat transfer amount. The present invention comprises: first and second manifolds; and a plurality of tubes.

Description

A convex shape turbulence formation on the surface increases the thermal efficiency. A manifold for a solar collector (a heat transfer efficiency in a solar collectors)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solar collector having a manifold for increasing heat transfer efficiency, and more particularly, to a device capable of increasing a heat transfer amount by forming a pattern having a depth and an angle set on a surface of a manifold.

In general, the most important factor in the utilization of the unlimited energy of solar energy is the high efficiency of the collector which collects the solar heat. Such high efficiency is achieved by applying the vacuum technology together with the heat pipe which is a high efficiency heating element, .

However, if the efficient collection of solar energy is not carried out efficiently, the high efficiency collector becomes useless, and the problem that the condensed heat energy is transferred to the water heater through the heat medium flow tube without heat loss is the total energy utilization It is another important variable that determines efficiency.

Therefore, the optimal design of the heat pipe and the manifold, which are the first gates of heat transfer, are very important variables.

As an example thereof, a vacuum tube type solar collector manifold as disclosed in Korean Patent No. 10-0712012 ("vacuum tube type solar collector eccentric type manifold"), more specifically, A manifold that is spaced apart from each other; An eccentric end cap having fluid passages is attached to one side and the other side of the manifold, Wherein the fluid passageway is configured to be formed on a top side of a vertical top of each eccentric end cap.

In this case, the conventional solar collector needs to maximize the heat transfer amount by widening the contact area between the manifold and the heat pipe. However, in the conventional manifold, the fluid inlet and outlet, which are the heating medium of the manifold, Thus, there is a problem in that a heat transfer phenomenon occurs unevenly from the condensation portion of the vacuum type solar collector because the flow heat medium does not sufficiently contact the condensation portion of the heat pipe.

In addition, the conventional vacuum tube type solar collector manifold needs to be designed with a complicated structure by separately providing a baffle, which may require additional manufacturing costs.

Korean Registered Patent No. 10-0712012 (Registration date April 20, 2007)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a heat exchanger having a manifold for increasing a heat transfer efficiency by forming a pattern having depth and angle set on a surface of a manifold, To provide a solar collector.

A solar collector provided with a manifold for increasing heat transfer efficiency according to an embodiment of the present invention includes a first manifold and a second manifold, And a plurality of tubes disposed in contact with opposing surfaces of the first manifold and the second manifold and spaced apart from each other by a predetermined distance, wherein the first manifold and the second manifold have a hollow plate tube shape A protrusion protruding in a semi-circular shape so as to surround the tube is formed, and a plurality of patterns having a predetermined depth and angle are formed on the outer surface of the protrusion.

In addition, the first manifold and the second manifold include an inlet formed at one side and an outlet formed at the other for passing the fluid.

And the pattern is formed by arranging a plurality of inequality shapes extending in the direction of the outlet portion.

And the pattern has a depth of about 1.2 to 1.3 mm from the outer surface of the protrusion.

And the pattern has an angle of about 145 to 155 degrees with respect to the shape of the inequality in the direction of the outlet.

Further, the manifold folder is provided with a heat insulating member on an outer surface thereof.

According to the present invention, a solar collector having a manifold for increasing heat transfer efficiency can increase the amount of heat transferred by forming a pattern having a predetermined depth and angle on the surface of a manifold.

1 is a perspective view of a solar collector according to an embodiment of the present invention;
2 is another perspective view of a solar collector according to an embodiment of the present invention;
3 is a perspective view of a manifold according to an embodiment of the present invention;
4 is a cross-sectional view of a manifold according to an embodiment of the present invention;
5 is a plan view of a manifold according to an embodiment of the present invention;
FIG. 6 is a configuration diagram of an experimental boundary condition setup of a manifold folder according to an embodiment of the present invention; FIG.
FIG. 7 is a perspective view illustrating a lattice formation of a manifold according to an embodiment of the present invention; FIG.
FIG. 8 is a side view of a manifold of a manifold according to an embodiment of the present invention. FIG.
9 is a graph showing a change in heat transfer amount and differential pressure according to a pattern depth change of a manifold according to an exemplary embodiment of the present invention.
10 is a graph showing a comparison between a heat transfer amount and a differential pressure change rate machining manifold according to a pattern depth change of a manifold according to an embodiment of the present invention.
11 is a graph showing a change in heat transfer amount and differential pressure according to a pattern angle change of a manifold folder according to an embodiment of the present invention.
12 is a graph showing a comparison between a heat transfer amount and a differential pressure change rate machining manifold according to a pattern angle change of a manifold folder according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solar collector having a manifold for increasing heat transfer efficiency according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. Also, throughout the specification, like reference numerals designate like elements.

In this case, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the following description and the accompanying drawings, A description of known functions and configurations that may unnecessarily obscure the description of the present invention will be omitted.

1 is a perspective view of a solar collector according to an embodiment of the present invention.

Referring to FIG. 1, the solar collector includes a first manifold 100 separated from the first manifold 100, and a second manifold 200 separated from the first manifold 100 by facing surfaces thereof. And a plurality of tubes 300 disposed in contact with opposing surfaces of the first manifold 100 and the second manifold 200 and spaced apart from each other by a predetermined distance.

The first manifold 100 and the second manifold 200 may include inlet portions 100a and 200a formed at one side for passing fluid and outlet portions 100b and 200b formed at the other side. have.

Here, the solar collector is not fixed in the vertical direction as shown in FIG. 1 but may be used in various directions and angles. Therefore, the first manifold 100 and the second manifold 200 can be moved horizontally or at various angles without being limited to moving the fluid up and down.

Further, the manifold may be integrally formed with a heat insulating member (not shown) on its outer surface or may be a manifold formed of a heat insulating material.

The first manifold 100 and the second manifold 200 are provided in a pair and the first manifold 100 and the second manifold 200 are used as hot water tanks for supplying or supplying a heating medium And may be a main pipe which is installed along the both sides of the solar collector as a series of constituent units one by one.

In addition, the solar collector may be collectively referred to as an apparatus for converting sunlight into heat energy.

In addition, the tube 300 may be a series of structures for allowing heat medium flowing along the first manifold 100 and the second manifold 200 to be heat-exchanged with the heat energy generated by the solar collector.

2 is another perspective view of a solar collector according to an embodiment of the present invention.

Referring to FIG. 1, the first manifold 100 and the second manifold 200 may be disposed at both ends with the tube 300 interposed therebetween. However, as shown in FIG. 2, can do.

3 is a perspective view of a manifold according to an embodiment of the present invention.

3, protrusions 110 and 210 protruding in a semicircular shape so as to surround the tube 300 are formed in the manifold folder. The protrusions 110 and 210 are formed with a predetermined depth d and an angle a A plurality of patterns 111 and 211 may be formed.

The patterns 111 and 211 may be formed by arranging a plurality of inequality shapes extending in the direction of the exit portions 100b and 200b.

4 is a cross-sectional view of a manifold according to an embodiment of the present invention.

Referring to FIG. 4, the first manifold 100 and the second manifold 200 may have a hollow plate shape.

The patterns 111 and 211 may have a depth d of about 1.2 to 1.3 mm from the outer surface of the protrusions 110 and 210.

The first manifold 100 and the second manifold 200 may have an inner height of about 5 mm and a thickness of about 1 mm.

The shapes of the patterns 111 and 211 are designed such that the workpiece is easily separated from the mold after the hydroforming process and are designed in the upward direction according to the positions as shown in FIG. 3, so that they are not formed in the same shape, .

5 is a plan view of a manifold according to an embodiment of the present invention.

Referring to FIG. 5, the patterns 111 and 211 may have an inequality (a) of about 145 to 155 degrees in an inequality shape in the direction of the exit portions 100b and 200b.

The above may be a shape of a hydroforming manifold considering thermal flow analysis.

The following may be the experiment for the depth (d) and the angle (a) of the pattern 111, 211 of the manifold folder as a basis for determining the manifold folder.

FIG. 6 is a configuration diagram of experimental boundary conditions of a manifold folder according to an embodiment of the present invention.

Referring to FIG. 6, the manifold may be heat exchanged while fluid passes through inlet 100a, 200a inlet and outlet 100b, 200b (outlet).

5, the patterns 111 and 211 can be experimentally set by setting the depth d within the range of 0.75 to 2 mm and the angle a within the range of 140 to 175 degrees.

)및 열량 계산식(

)이 사용될 수 있다.The experiments are based on mass conservation equations, momentum equations, energy equations, Reynolds number

) And calorie calculation formula (

) Can be used.

,

)(

,

)

Also, the above experiment can be applied to a flow rate similar to that of a conventional manifold (0.118 kg / s) as a basic flow rate.

Also, the experiment may be performed after assuming that the outer surface of the manifold folder is relatively insulated to the maximum.

Also, the experiment may be performed by setting the amount of heat of the fluid passing through the tube 300 to 200 (W).

FIG. 7 is a perspective view illustrating a lattice formation of a manifold according to an embodiment of the present invention, and FIG. 8 is a side view illustrating a lattice formation of a manifold according to an embodiment of the present invention.

Referring to FIGS. 7 and 8, it can be seen that the manifold folder has the largest number of gratings at the portions where the patterns 111 and 211 are formed.

At this time, the number of grids is the result of analysis by the ANSYS program. As the patterns 111 and 211 are formed, it can be seen that the heat flow increases toward the inside of the manifold.

The result of the comparison between the manifold folder according to the experiment and the manifold without the patterns 111 and 211 may be shown below.

FIG. 9 is a graph showing a change in heat transfer amount and differential pressure according to a depth d of a pattern 111, 211 of a manifold according to an exemplary embodiment of the present invention. 111, 211) Depth (d) is a graph comparing the heat transfer amount with the differential pressure change rate machining manifold.

Here, the unprocessed manifold refers to the existing hydroforming manifold, and the calorie is 163.9 (W) and the differential pressure is 23.3 (pa).

9, when the angle a of the patterns 111 and 211 is 160 degrees, the change of the heat transfer amount and the differential pressure according to the depth d of the patterns 111 and 211 is different from the patterns 111 and 211, It can be seen that the heat quantity and the differential pressure increase at the same time as the depth d increases.

Referring to FIG. 10, when the angle a of the patterns 111 and 211 is 160 degrees, the difference between the heat transfer amount and the differential pressure with respect to the unprocessed manifold according to the depth d of the patterns 111 and 211 is compared As a result, it can be seen that as the depth d of the patterns 111 and 211 increases, the heat quantity and the pressure difference increase to a constant width. The rate of heat change is larger than the pressure change amount according to the depth d of the patterns 111 and 211 Can be seen.

FIG. 11 is a graph of a change in heat transfer amount and differential pressure according to a change in angle (a) of a pattern 111, 211 of a manifold folder according to an embodiment of the present invention. 111,211) A comparison graph between the heat transfer amount and the differential pressure change rate machining folder according to the change in angle (a).

Referring to FIG. 11, it can be seen that as the angle a increases, the differential pressure increases as the heat transfer amount and the differential pressure change with the variation of the angle a of the pattern 111 and 211.

Also, although the amount of heat increases from 140 degrees to 150 degrees, the change in the amount of heat is stagnated from 150 degrees to 160 degrees, and the amount of heat decreases toward the angle (a) after 160 degrees .

Here, the amount of heat described above and below may mean the amount of internal heat of the manifold.

12, as a result of comparing the heat transfer amount with the unprocessed manifold according to the change of the angle (a) of the patterns 111 and 211 and the differential pressure, as the angle (a) increases, As shown in Fig.

Also, it can be seen that the amount of heat increases to a certain angle (a) and decreases again.

Table 1 below shows the heat quantity and the differential pressure value according to the depth d of the pattern 111 and 211 and Table 2 shows the heat quantity and the differential pressure value according to the angle a of the pattern 111 and 211.

(Table 1)

(Table 2)

In this case, the optimum depth d is a value with a high calorie and a relatively low differential pressure, and the value of the angle a may be a condition with a high calorie value and a relatively low differential pressure.

Therefore, the optimum design setting value of the pattern 111,211 of the manifold folder can be set to be 1.25 mm in depth (d) and 150 degrees in angle a, based on the experiment.

Accordingly, the heat transfer of the manifold can be increased by 14% compared to the conventional unmanaged manifold, and the differential pressure may be similar to that of the conventional cylindrical manifold.

The present invention may be developed in view of the high defect rate of the product due to the welding process of the manifold, which is a core component of the phase conversion type solar collector, and the necessity of technology development due to a decrease in manufacturing cost economics due to manual operation.

Therefore, the manifolder of the present invention can develop a manifold that can be automatized by adopting a mold forming technology which is a root technology, and which is a manifold folder in which a defect occurrence rate is zeroed by welding process and heat exchange area is maximized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all the equivalents or equivalents of the claims, as well as the appended claims, fall within the scope of the present invention .

100: first manifold folder 200: second manifold folder
300: tube 110, 210:
111, 211: pattern 100a, 200a:
100b, 200b: outlet portion d: depth of pattern
a: angle of the pattern

Claims (6)

A first manifold that is separated from the first manifold in two directions, but faces the first manifold and the second manifold; And
And a plurality of tubes disposed in contact with opposing surfaces of the first manifold and the second manifold and spaced apart from each other by a predetermined distance,
The first manifold and the second manifold are formed in an open hollow plate shape, and protrusions protruding in a semicircular shape are formed so as to surround the tubes, and a plurality of patterns having predetermined depths and angles are formed on outer surfaces of the protrusions Shaped convex-shaped turbulence forming surface, characterized in that the manifold of the solar collector is increased in thermal efficiency.
The apparatus of claim 1, wherein the first manifold and the second manifold
And an outlet formed at one side and an outlet formed at the other side for passing the fluid through the manifold.
The method of claim 1,
Wherein a plurality of inequality shapes formed in the direction of the outlet are formed by arranging a plurality of inequality shapes in the direction of the outlet portion.
The method of claim 1,
And a depth from the outer surface of the protrusion is about 1.2 to 1.3 mm. A manifold for a convective turbulator forming thermal efficiency increasing solar collector of a surface.
4. The method of claim 3,
Wherein the angle of the inequality in the direction of the outlet is about 145 to 155 degrees.
The method according to claim 1,
And a heat insulating member is provided on the outer surface of the heat collecting plate.

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