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, a circular pipe 20 that is disposed on one side of the panel body 10 to allow a heat medium fluid to pass through it, a sheet-like heat transfer member 30 that coats the pipe 20, and a pressing member 40 that presses the pipe 20 against the panel body 10 through the heat transfer member 30. The heat transfer member 30 is composed of a flexible graphite sheet, bends to be in close contact with the outer periphery of the pipe 20, and comes into close contact with one side of the panel body 10 at both sides across the pipe 20.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. 6, 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 heat transfer device comprising: a panel body; a circular tubular pipe arranged on one side of the panel body and through which a heat transfer fluid passes; a sheet-like heat transfer member covering the pipe; and a pressing member pressing the pipe towards the panel body via the heat transfer member, wherein the heat transfer member is made of a flexible graphite sheet, curved so as to be in close contact with the outer circumferential surface of the pipe, and in close contact with one side of the panel body on both sides of the pipe. The pressing member has a notched pressing portion formed in a portion that contacts the heat transfer member, and the pressing portion presses the pipe via the heat transfer member. This is achieved by radiant panels.

[0007] In this radiant panel, it is preferable that the heat transfer member has a bent portion formed so as to be convex toward the panel body and to be along both one surface of the panel body and the outer peripheral surface of the pipe.

[0008] 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 circumferential surface of the pipe.

[0009] The panel body may include a mounting portion having an arc-shaped cross section to which the pipe is mounted, and the mounting portion may be configured so that both ends of the arc-shaped mounting portion protrude toward one surface of the panel body. In this configuration, it is preferable that the bent portion of the heat transfer member is sandwiched between the one surface of the panel body and the outer peripheral surface of the mounting portion.

[0010] It is preferable that thermal grease be interposed between the panel body covered by the heat transfer member and the pipe. [Effects of the Invention]

[0011] 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]

[0012] [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. 10 is an enlarged cross-sectional view of a main part of a radiation panel according to another embodiment of the present invention. [Figure 5] FIG. 5 is a cross-sectional view showing a modification of FIG. 4. [Figure 6] FIG. 10 is an enlarged cross-sectional view of a main part of a conventional radiation panel. DETAILED DESCRIPTION OF THE INVENTION

[0013] 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 covers the pipe 20, and a pressing member 40 that presses the pipe 20 toward the panel body 10 via the heat transfer member 30.

[0014] 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 top 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 bottom surface of the panel body 10 is flat, but may also have multiple ribs, curved sections, or the like. The top 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, such as punched holes, formed therein, as needed.

[0015] 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.

[0016] 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.

[0017] In this embodiment, a plurality of heat transfer members 30 are formed in a strip shape and arranged along each straight section 21 of the pipe 20, covering each straight section 21 individually, but a plurality of straight sections 21 may also be integrally covered by a single heat transfer member 30. It is preferable that the heat transfer member 30 covers most of the pipe 20 as in this embodiment, but the proportion of the covered portion to the entire pipe 20 is not particularly limited.

[0018] 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 the pipe 20 via the heat transfer member 30.

[0019] Fig. 2 is an enlarged view of a main portion of the cross section AA in Fig. 1. As shown in Fig. 2, heat transfer member 30 is curved in an arc shape so as to fit closely to the outer peripheral surface of straight portion 21 of pipe 20, and is in close contact with upper surface 10a of panel main body 10 on both sides of pipe 20. Heat transfer member 30 has bent portions 31 and 32 that convex obliquely downward toward panel main body 10 between the portions that are in close contact with panel main body 10 and pipe 20, respectively, and these bent portions 31 and 32 are sandwiched between panel main body 10 and pipe 20.

[0020] The pressing member 40 has a notched pressing portion 41 formed in a portion that comes into contact with the heat transfer member 30, and the pressing portion 41 presses the pipe 20 downward via the heat transfer member 30, thereby bringing the heat transfer member 30 into close contact with both the panel main body 10 and the pipe 20. 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 without a notched portion, such as a pressing plate with a flat lower surface.

[0021] The radiation panel 1 having the above configuration has a heat transfer member 30 made of a graphite sheet that is in close contact with the panel 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 body 10 via the heat transfer member 30, thereby enabling efficient air conditioning.

[0022] The heat transfer member 30 has bent portions 31 and 32 formed so as to be convex toward the panel body 20, thereby increasing the contact area between the panel body 10a and the pipe 20 and promoting heat transfer from the pipe 20 to the panel body 10. Furthermore, the bent portions 31 and 32 are sandwiched and fixed between the upper surface 10a of the panel body 10 and the outer peripheral surface of the pipe 20, thereby reliably maintaining a tight contact state between the panel body 10, the pipe 20 and the heat transfer member 30 and maximizing the contact area.

[0023] 3, thermal grease 50, which has excellent thermal conductivity, may be interposed between the upper surface 10a of the panel main body 10, which is covered with the heat transfer member 30, and the outer peripheral surface of the pipe 20. By supplying the thermal grease 50 between the panel main body 10 and the pipe 20 and then covering it with the heat transfer member 30, the gap between the panel main body 10 and the pipe 20 can be reliably filled with the thermal grease 50, thereby more efficiently transferring heat from the pipe 20 to the panel main body 10. The thermal grease 50 may be a known material, for example, silicone oil with powder having high thermal conductivity, such as alumina, dispersed therein.

[0024] Although one embodiment of the present invention has been described in detail above, specific aspects of the present invention are not limited to the above embodiment. For example, in this embodiment, the pipe 20 is placed on the flat upper surface 10a of the panel body 10. However, if the upper surface 10a of the panel body 10 has an attachment portion for the pipe 20, the pipe 20 attached to this attachment portion may be covered with the heat transfer member 30.

[0025] Figure 4 is an enlarged cross-sectional view of a main part of an example of a radiating panel in which a pipe 20 is attached to a mounting portion of the panel body 10. A plurality of mounting portions 15 shown in Figure 4 are provided on the panel body 10, and a straight portion 21 of the pipe 20 is attached to each mounting portion 15. In Figure 4, components that are the same as those in Figure 2 are given the same reference numerals.

[0026] The mounting portion 15 is formed in an arc-shaped cross section with a substantially uniform thickness, and is fixed integrally to the flat portion of the panel main body 10 so that both arc-shaped ends 15a, 15b protrude toward the upper surface 10a of the panel main body 10. The arc-shaped central portion 15c of the mounting portion 15 bulges toward the lower surface 10b of the panel main body 10, and 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 toward the lower surface 10b of the panel main body 10, and may, for example, be fixed to the upper surface 10a of the panel main body 10. The thickness of the mounting portion 15 is not particularly limited, but may be approximately the same as the thickness of the pipe 20, for example, so as to maintain strength without interfering with heat transfer.

[0027] The mounting portion 15 is formed so that the arc length 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).

[0028] The heat transfer member 30 is in close contact with the portion of the pipe 20 exposed above the mounting portion 15, and is in close contact along the outer peripheral surface of the arc-shaped cross section of the mounting portion 15 on both sides of the pipe 20, and is also in close contact with the upper surface 10a of the panel main body 10. The bent portions 31 and 32 of the heat transfer member 30 are sandwiched and fixed in the constricted portion between the upper surface 10a of the panel main body 10 and the outer peripheral surface of the mounting portion 15. Even with this configuration, 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.

[0029] In the configuration shown in Fig. 4, thermal grease may be applied to the portions of the mounting portion 15 and the pipe 20 that are covered by the heat transfer member 30. As shown in Fig. 5, by applying thermal grease 50 between the mounting portion 15 of the panel main body 10 and the pipe 20, heat can be transferred more efficiently from the pipe 20 to the panel main body 10. Furthermore, by applying thermal grease 51, 52 between the upper surface 10a of the panel main body 10 and the outer peripheral surface of the mounting portion 15, the gap between the panel main body 10 and the heat transfer member 30 can be reliably filled, thereby suppressing heat transfer loss. [Explanation of symbols]

[0030] 1 Radiant Panel 10 Panel body 15 Mounting part 20 Pipe 30 Heat transfer material 31,32 Bend part 40 Pressing member 50 Thermal grease

Claims

1. The panel body and a circular pipe disposed on one side of the panel body and through which a heat transfer fluid passes; a sheet-like heat transfer member covering the pipe; a pressing member that presses the pipe toward the panel body via the heat transfer member, the heat transfer member is made of a flexible graphite sheet, curved so as to be in close contact with the outer circumferential surface of the pipe, and in close contact with one surface of the panel body on both sides of the pipe; The pressing member has a notched pressing portion formed in a portion that comes into contact with the heat transfer member, and the pressing portion presses the pipe via the heat transfer member.

2. The radiant panel according to claim 1 , wherein the heat transfer member has a bent portion formed so as to be convex toward the panel body and to extend along both one surface of the panel body and the outer peripheral surface of the pipe.

3. The radiant panel according to claim 2 , wherein the heat transfer member is fixed by sandwiching the bent portion between one surface of the panel body and the outer circumferential surface of the pipe.

4. The panel body includes a mounting portion having an arc-shaped cross section to which the pipe is mounted, The mounting portion has both arc-shaped ends protruding from one side of the panel body, The radiant panel according to claim 2 , wherein the bent portion of the heat transfer member is sandwiched between one surface of the panel body and an outer peripheral surface of the mounting portion.

5. 4. The radiant panel according to claim 1, wherein a heat dissipating grease is interposed between the panel body covered with the heat transfer member and the pipe.

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