Radiant Panel

Abstract

To provide a radiation panel that can efficiently perform air conditioning through improved heat transfer properties.SOLUTION: A radiation panel 1 comprises a panel body 10 comprising, on one side, a mounting part 15 with its inner peripheral face formed arcuate in cross section, a circular pipe 20 mounted to the mounting part 15, a sheet-like heat transfer member 30 that is interposed between the mounting part 15 and the pipe 20 to transfer heat of the pipe 20 to the panel body 10, and a pressing member 40 that presses the pipe 20 against the heat transfer member 30. The heat transfer member 30 is composed of a flexible graphite sheet.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a radiant panel. [Background technology]

[0002] Radiant panels have traditionally been installed on ceilings or other surfaces to heat or cool a room. As shown in FIG. 5, Patent Document 1, for example, discloses a radiant panel 100 including a panel body 101 and a heat conduction unit 102 disposed on the rear surface of the panel body 101. The heat conduction unit 102 includes a tubular member 103, a corrugated main heat conduction sheet 104, and a flat sub-heat conduction sheet 105. The tubular member 103 is housed in the valleys 104a of the main heat conduction sheet 104, and the peaks 104b are bonded to the sub-heat conduction sheet 105, thereby forming the entire unit. Heat from a heat medium passing through the tubular member 103 is transferred to the panel body 101 via the main heat conduction sheet 104 and the sub-heat conduction sheet 105. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-240744 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional radiant panel 100, when deformation such as twisting occurs in the thermal conduction unit 102, gaps are likely to occur between the main thermal conduction sheet 104 and the sub-thermal conduction sheet 105 and the tubular member 103, and between the sub-thermal conduction sheet 105 and the panel body 101, which may result in a decrease in thermal conductivity.

[0005] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radiant panel that can perform air conditioning efficiently by improving heat transfer. [Means for solving the problem]

[0006] The object of the present invention is to provide a panel body having a mounting portion on one side of which the inner circumferential surface is formed in a circular arc cross section, a cylindrical pipe mounted on the mounting portion, a sheet-like heat transfer member interposed between the mounting portion and the pipe to transfer heat from the pipe to the panel body, and a pressing member for pressing the pipe against the heat transfer member, the heat transfer member being made of a flexible graphite sheet. The mounting portion is fixed integrally to the flat portion of the panel body such that both ends in the arc direction protrude toward one surface of the panel body, the heat transfer member is folded back at folding portions from the inner peripheral surface of the mounting portion through the both ends and along the outer peripheral surface, and is in close contact with one surface of the panel body on both sides of the mounting portion, the inner peripheral surface and the outer peripheral surface of the mounting portion being formed in an arc-shaped cross section so that the thickness is approximately constant, and the heat transfer member has bent portions formed to be convex toward the panel body so as to fit along both the one surface of the panel body and the outer peripheral surface of the mounting portion. This is achieved by radiant panels.

[0007] It is preferable that the pressing member abuts on the folded portion of the heat transfer member while pressing the pipe.

[0008] before It is preferable that the heat transfer member is fixed with the bent portion sandwiched between one surface of the panel body and the outer peripheral surface of the mounting portion. [Effects of the Invention]

[0009] According to the radiant panel of the present invention, air conditioning can be performed efficiently due to improved heat transfer. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a plan view of a radiation panel according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of a main part of the cross section AA of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a modification of FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view showing another modified example of FIG. 2. [Figure 5] FIG. 10 is an enlarged cross-sectional view of a main part of a conventional radiation panel. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a plan view of a radiant panel according to one embodiment of the present invention. The radiant panel 1 shown in Fig. 1 is a radiant panel for heating and cooling that is attached to an indoor ceiling, and includes a panel body 10, a cylindrical pipe 20 that is arranged on the upper surface of the panel body 10 and through which a heat transfer fluid passes, a sheet-like heat transfer member 30 that is interposed between the panel body 10 and the pipe 20, and a pressing member 40 that presses the pipe 20 against the heat transfer member 30.

[0012] The panel body 10 is a flat, rectangular member in a plan view, made of a metal material with high thermal conductivity, such as aluminum. The panel body 10 has side walls 11 and 12 on both sides of the parallel direction of the straight sections 21 of the pipes 20 (described later), and upright walls 13 and 14 that rise at approximately right angles from the upper surface 10a of the panel body 10 on both sides of the direction perpendicular to the parallel direction of the straight sections 21. In this embodiment, the lower surface of the panel body 10 is flat, but may also have multiple ribs or curved sections. The upper surface 10a of the panel body 10 may be provided with a heat transfer layer made of a material with higher thermal conductivity than the material of the panel body 10 (e.g., graphite). The panel body 10 may have a large number of small holes formed therein, as needed.

[0013] The pipe 20 has a plurality of parallel straight sections 21, each of which has adjacent ends connected via a curved section 22, forming a meandering flow path. A heat transfer fluid can pass through the pipe 20 from one end 23 to the other end 24. Note that FIG. 1 does not illustrate the vicinity of both ends of the pipe 20. While the material of the pipe 20 is not particularly limited, it is preferable to construct the pipe 20 using a heat transfer tube made of a highly thermally conductive material such as aluminum, copper, or graphite. The pipe 20 may be a single-layer heat transfer tube, a double-layer heat transfer tube in which only the inner surface of the heat transfer tube is coated with a resin coating layer such as polyethylene, or a three-layer heat transfer tube in which both the inner and outer surfaces of the heat transfer tube are coated with a resin coating layer. When the pipe 20 is a single-layer or double-layer pipe, the heat transfer member 30 is in direct contact with the heat transfer tube, allowing efficient transfer of heat from the pipe 20 to the panel body 10 via the heat transfer member 30.

[0014] The heat transfer member 30 is made of a flexible graphite sheet obtained by rolling graphite (expanded graphite) into a sheet. The thickness of the graphite sheet is not particularly limited, but is preferably 10 to 500 μm, and more preferably 60 to 250 μm. The thermal conductivity of the graphite sheet is also not limited, but the in-plane thermal conductivity is preferably 30 W / m·K or more, and more preferably 50 W / m·K. The ratio (λ1 / λ2) of the in-plane thermal conductivity λ1 to the thickness direction thermal conductivity λ2 is preferably 10 times or more, and more preferably 30 times or more.

[0015] In this embodiment, the heat transfer members 30 are formed in a strip shape and are arranged along each straight portion 21 of the pipe 20, and are in contact with each straight portion 21 individually, but a single heat transfer member 30 may be arranged to be in contact with multiple straight portions 21. It is preferable that the heat transfer members 30 be in contact with most of the pipe 20 as in this embodiment, but the proportion of the contact portion with respect to the entire pipe 20 is not particularly limited.

[0016] The pressing members 40 are made of lattice-shaped members, and a plurality of them (three in this embodiment) are arranged at intervals so as to be perpendicular to each straight section 21 of the pipe 20. Each pressing member 40 is formed in a U-shaped cross section that opens downward, and both longitudinal ends are fixed to the side walls 11, 12 of the panel main body 10 with rivets, bolts, etc. so that the lower end presses against the pipe 20.

[0017] Fig. 2 is an enlarged view of a main part of the AA cross section in Fig. 1. As shown in Fig. 2, a mounting portion 15 to which a pipe 20 is attached is provided on the upper surface 10a side of the panel main body 10. A plurality of mounting portions 15 shown in Fig. 2 are provided on the panel main body 10, and a straight portion 21 of the pipe 20 is attached to each mounting portion 15.

[0018] The mounting portion 15 has an inner peripheral surface formed to have an arc-shaped cross section, and is fixed integrally to the flat portion of the panel main body 10 so that both end portions 15a, 15b in the arc direction protrude toward the upper surface 10a of the panel main body 10. The shape of the outer peripheral surface of the mounting portion 15 is not particularly limited, but in this embodiment, the mounting portion 15 is formed to have an arc-shaped cross section so that the thickness of the mounting portion 15 is approximately constant. The thickness of the mounting portion 15 is not particularly limited, but can be, for example, approximately the same as the thickness of the pipe 20 so as to maintain strength without interfering with heat transfer.

[0019] A central portion 15c of the mounting portion 15 in the arc direction bulges out toward the lower surface 10b of the panel main body 10, forming a spandrel-type panel main body 10. A constricted portion is formed between the outer peripheral surface of the mounting portion 15 and the upper surface 10a of the panel main body 10. The central portion 15c of the mounting portion 15 may not bulge out toward the lower surface 10b of the panel main body 10, and may be fixed to the upper surface 10a of the panel main body 10, for example.

[0020] The mounting portion 15 is formed so that the length of the arc of the inner peripheral surface is slightly longer than the semicircle, and the straight portion 21 of the pipe 20 is attached by being hammered in from above with a hammer or the like. The material of the mounting portion 15 may be the same as the material of the flat portion of the panel main body 10, or may be a material with a higher thermal conductivity than the material of the flat portion of the panel main body 10 (for example, graphite).

[0021] Heat transfer member 30 is folded back at folding portions 31, 32 above mounting portion 15 so as to fit along the inner and outer circumferential surfaces of mounting portion 15, and is in close contact with upper surface 10a of panel main body 10 on both sides of mounting portion 15. Bent portions 33, 34 that convex obliquely downward toward panel main body 10 are formed in heat transfer member 30 between the portions that are in close contact with upper surface 10a of panel main body 10 and the outer circumferential surface of mounting portion 15, and these bent portions 33, 34 are sandwiched and fixed in the narrowed portion between upper surface 10a of panel main body 10 and the outer circumferential surface of mounting portion 15.

[0022] The pressing member 40 has a notched pressing portion 41 formed in a portion that comes into contact with the pipe 20, and the pressing portion 41 presses the pipe 20 downward, thereby bringing the pipe 20 into close contact with the heat transfer member 30. In this embodiment, the pressing portion 41 has a rectangular notched shape, but the notched portion may have another shape, such as an arc shape. The pressing member 40 may also have a configuration that does not have a notched portion, such as a pressing plate with a flat lower surface.

[0023] In the radiant panel 1 having the above-described configuration, the heat transfer member 30 made of a graphite sheet is interposed between the mounting portion 15 of the panel main body 10 and the pipe 20, so that the heat of the heat transfer fluid passing through the pipe 20 can be quickly and reliably diffused to the panel main body 10 via the heat transfer member 30, thereby enabling efficient air conditioning.

[0024] The heat transfer member 30 is folded at the folding portions 31, 32 to flexibly deform so as to fit the inner and outer peripheral surfaces of the mounting portion 15, and the restoring force of the flexure allows the heat transfer member 30 to be securely attached to the outer peripheral surface of the pipe 20, thereby improving the heat transfer efficiency.

[0025] Furthermore, the heat transfer member 30 has bent portions 33, 34 formed to be convex toward the panel main body 20, which increases the contact area with the upper surface 10a of the panel main body 10 and the mounting portion 15, thereby promoting heat transfer from the pipe 20 to the panel main body 10. Furthermore, these bent portions 33, 34 are sandwiched and fixed between the upper surface 10a of the panel main body 10 and the outer peripheral surface of the mounting portion 15, which reliably maintains a tight contact state between the heat transfer member 30 and the upper surface 10a of the panel main body 10 and the mounting portion 15, and maximizes the contact area.

[0026] In the configuration shown in Fig. 2, in order to prevent the folded portions 31 and 32 of the heat transfer member 30 from floating up and to maintain good adhesion between the panel body 10 and the pipe 20 and the heat transfer member 30, a configuration may be adopted in which the pressing member 40 abuts against the folded portions 31 and 32 of the heat transfer member 30 while pressing the pipe 20, as shown in Fig. 3. Note that in Fig. 3, the same components as those in Fig. 2 are denoted by the same reference numerals (the same applies to the following figures).

[0027] 2, the heat transfer member 30 does not necessarily have to include the folded portions 31, 32 or the bent portions 33, 34, but only needs to be interposed between the mounting portion 15 and the pipe 20, as shown in Fig. 4. Even in the configuration shown in Fig. 4, the heat of the pipe 20 can be efficiently transferred to the panel body 10. [Explanation of symbols]

[0028] 1 Radiant Panel 10 Panel body 15 Mounting part 20 Pipe 30 Heat transfer material 31,32 Folded section 33,34 Bend part 40 Pressing member

Claims

1. a panel body having a mounting portion on one side thereof, the mounting portion having an inner circumferential surface formed in an arc-shaped cross section; a cylindrical pipe attached to the attachment portion; a sheet-like heat transfer member interposed between the mounting portion and the pipe to transfer heat from the pipe to the panel body; a pressing member that presses the pipe against the heat transfer member, the heat transfer member is made of a flexible graphite sheet, the mounting portion is fixed integrally to the flat portion of the panel body such that both ends in the arc direction protrude toward one surface of the panel body, the heat transfer member is folded back at a folding portion from the inner peripheral surface of the mounting portion through both end portions along the outer peripheral surface, and is in close contact with one surface of the panel main body on both sides of the mounting portion; The mounting portion has an inner circumferential surface and an outer circumferential surface formed in an arc-shaped cross section so that the wall thickness is substantially constant, A radiant panel in which the heat transfer member has a bent portion formed so as to be convex toward the panel body, along both one surface of the panel body and the outer peripheral surface of the mounting portion.

2. The radiant panel according to claim 1 , wherein the pressing member abuts against the folded portion of the heat transfer member while pressing the pipe.

3. The radiant panel according to claim 1 , wherein the heat transfer member is fixed by sandwiching the bent portion between one surface of the panel body and an outer peripheral surface of the mounting portion.

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