Floor heating hot water panel and floor heating system using same

Abstract

Provided are: a floor heating hot water panel which improves heating efficiency, has reduced size and weight, and is capable of reducing thermal deformation; and a floor heating system using the same. The floor heating hot water panel (2) includes a piping groove (200) that is recessed in the upper surface (21) of a heat insulating panel (20), and a heat exchange pipe (3). The piping groove (200) has an outward path groove section (201), a return path groove section (202), and a heat dissipation groove section (203). The heat exchange pipe (3) includes an outward path pipe (310) disposed in the outward path groove section (201), a return path pipe (320) disposed in the return path groove section (202), and a heat dissipation pipe (330) disposed in the heat dissipation groove section (203) and connected between the outward path pipe (310) and the return path pipe (320). The inner diameters (D1) of the outward path pipe (310) and the return path pipe (320) are set so that the flow rate inside the pipes when hot water (50) having a rated supply flow rate is supplied is 0.17 m / s to 0.26 m / s. The inner diameter (D2) of the heat dissipation pipe 330 is set so that the flow rate inside the pipe when hot water (50) having a rated supply flow rate is supplied is 0.10 m / s to 1.25 m / s.

Description

Floor heating hot water panel and floor heating system using it

[0001] The present invention relates to floor heating technology and relates to a floor heating hot water panel in which an insulating panel with heat exchange pipes running through it is laid under the floor finishing material of a building, and a heat medium is supplied or circulated through the heat exchange pipes to provide heating, and a floor heating system that utilizes the same.

[0002] Conventional floor heating hot water panels, such as the floor heating panel and floor heating panel assembly shown in Patent Document 1 (Patent No. 6072828), are of a series type in which the heat exchange pipes of multiple insulating panels are connected in series. This series type has the disadvantage that the heat exchange pipes running through the insulating panels are long, which causes the hot water to cool down and makes it difficult to improve the heating effect.

[0003] The applicant of this application has disclosed a parallel system in which the heat exchange pipes of the insulation panel are connected in parallel to the floor heating panel shown in Patent Document 2 (Patent No. 6860930). The parallel system floor heating panel has multiple heat exchange pipes arranged in parallel, and each heat exchange pipe can be made shorter than the conventional series system, allowing the hot water to finish passing through before it cools down, thereby improving heating efficiency.

[0004] Patent No. 6072828 Patent No. 6860930

[0005] The applicant of this application is currently developing a floor heating hot water panel that can be used more economically by further improving the heating efficiency of the panel. With existing floor heating hot water panels, the heating efficiency deteriorates when the flow rate of hot water through the heat exchange pipe is high, but when the flow rate is reduced, sufficient heating effect cannot be obtained.

[0006] In addition, the thickness of existing floor heating hot water panels requires the floor finishing materials to be installed higher, narrowing the indoor space. The thicker the insulation panels, the higher the costs of manufacturing, storage, and transportation, and the greater the workload required for installation. Furthermore, existing floor heating hot water panels have the risk of thermal expansion due to the heat generated by the insulation panels themselves, which can lead to deformation or damage.

[0007] In view of the above circumstances, the present invention provides a floor heating hot water panel that can improve heating efficiency without increasing the temperature and flow rate of hot water. It also provides a floor heating hot water panel that can be made thinner and lighter by reducing the thickness of the insulation panel. It also provides a floor heating hot water panel that can reduce deformation due to its own heat. It also provides a floor heating system that uses the floor heating hot water panel.

[0008] The present invention relates to an insulating panel having a predetermined thickness and made of a flat insulating material, a piping groove recessed in the upper surface of the insulating panel, and a heat exchange pipe arranged in the piping groove, wherein the piping groove has an outgoing groove portion and a return groove portion, and a heat dissipation groove portion whose upstream end is connected to the outgoing groove portion and whose downstream end is connected to the return groove portion, and the heat exchange pipe comprises an outgoing pipe arranged in the outgoing groove portion, a return pipe arranged in the return groove portion, and a heat exchange pipe arranged in the heat dissipation groove portion, whose upstream end is connected to the outgoing pipe and whose downstream end is connected to the return pipe. The present invention provides a floor heating hot water panel having a heat exchanger pipe and a heat radiation pipe connected to a supply pipe. The inner diameters (D1) of the supply pipe and the return pipe are set so that when hot water is supplied to the heat exchanger pipe at a rated supply flow rate, the flow velocity in the supply pipe and the return pipe is 0.17 m / s to 0.26 m / s, and the inner diameter (D2) of the heat radiation pipe is set so that when hot water is supplied to the heat exchanger pipe at a rated supply flow rate, the flow velocity in the heat radiation pipe is 0.10 m / s to 1.25 m / s. While the flow velocity in the pipes can be adjusted based on the flow rate output from a hot water supply device such as a boiler, the rated flow rate of the hot water supply device generally does not change significantly and is dependent on the water pressure of the mains water supply (0.15 MPa to 0.4 MPa). Therefore, the present invention adjusts the inner diameters of the heat exchanger pipes (i.e., the supply pipe, the return pipe, and the heat radiation pipe) to adjust the flow velocity in the pipes to an optimal range.

[0009] The floor heating hot water panel increases the flow rate in the pipes compared to conventional types, allowing for better heat dissipation and increased heating efficiency. The insulation panel is made of a flat insulating material that can be laid singly or in combination to reduce heat loss to the underfloor. A piping groove is recessed in the upper surface of the insulation panel, allowing heat exchange pipes to be installed flush with the upper surface. The insulation material of the insulation panel can be made of, for example, closed-cell urethane foam, polystyrene foam, rigid urethane foam, phenolic foam, carbonized cork, or other materials.

[0010] The piping groove enables the heat exchange pipe to be installed flush with the upper surface of the insulation panel. The piping groove may be shaped so as to fit closely to the bottom and side surfaces of the heat exchange pipe, excluding the upper surface, in the installed position. The piping groove may be configured on the upper surface of the insulation panel to include an outward groove and a return groove that are parallel to each other, and one or more heat dissipation grooves, each having an upstream end connected to the outward groove and a downstream end connected to the return groove. The outward groove may be arranged so as to be continuous with the outward groove of an adjacent insulation panel, and the return groove may be arranged so as to be continuous with the return groove of an adjacent insulation panel.

[0011] The heat exchange pipes, which are the outward pipe, return pipe, and heat dissipation pipe, guide hot water supplied from outside the floor heating hot water panel along the upper surface of the insulation panel and dissipate heat, thereby providing floor heating functionality. The heat exchange pipes are flexible enough to deform along the piping grooves and are made of a material that has excellent waterproofing, heat resistance, and durability, such as ethylene propylene diene rubber, silicone rubber, natural rubber, other synthetic rubbers, cross-linked polyethylene, other resins, aluminum, copper, other metals, etc.

[0012] The heat exchange pipe is formed by an outgoing pipe disposed in the outgoing groove, a return pipe disposed in the return groove, and a heat dissipation pipe disposed in the heat dissipation groove. The heat dissipation pipe has an upstream end connected to the outgoing pipe, a downstream end connected to the return pipe, and a heat dissipation area enlargement section between the upstream and downstream ends that forms a wave shape such as a sine wave or a detour shape such as a serpentine shape to enlarge the heat dissipation area. The outgoing pipe and the return pipe have inner diameters larger than that of the heat dissipation pipe to ensure the flow rate of multiple heat dissipation pipes. The outgoing pipe has connectors at at least both ends that connect to outgoing pipes disposed in the outgoing groove of adjacent insulation panels. The return pipe has connectors at at least both ends that connect to return pipes disposed in the return groove of adjacent insulation panels. The connectors can be replaced with sealing plugs. A hot water supply device for circulating and supplying hot water can be connected to the forward end of the forward pipe and the return end of the return pipe.

[0013] The flow velocity in the outward and return pipes is preferably set to 0.17 m / s to 0.26 m / s when the rated supply flow rate is 0.50 L / min. If the flow velocity in the pipes is less than 0.17 m / s, the flow velocity is too slow to generate a sufficient flow velocity in the heat dissipation pipe. Furthermore, if the flow velocity in the pipes exceeds 0.26 m / s, it is necessary to select outward, return, and heat dissipation pipes with greater durability, as increased wall thickness may result in reduced heat dissipation performance. The inner diameter (D1) of the outward and return pipes can be set to the average inner diameter (D1) of the outward and return pipes. In particular, increasing the flow velocity in the outward pipe increases the flow velocity of the liquid flowing into the heat dissipation pipe, and increasing the flow velocity in the return pipe increases the flow velocity of the liquid flowing out of the heat dissipation pipe. As a result, the flow rate of the liquid increases at least near the inlet and outlet of the heat radiation pipe, and the overall flow rate of the liquid per floor heating hot water panel increases.

[0014] The inner diameter (D1) of the outward pipe and the return pipe can be set to one or more inner diameter dimensions within a range such that the flow velocity in the pipe when hot water is supplied to the heat exchange pipe at a rated supply flow rate is 0.17 m / s to 0.26 m / s, preferably 0.17 m / s to 0.21 m / s. For example, the inner diameter (D1) of the outward pipe and the return pipe can be set to an average inner diameter (D1) of Φ6 to Φ7.9 mm over the entire length, such that the flow velocity in the outward pipe and the return pipe when hot water is supplied to the heat exchange pipe at a rated supply flow rate is 0.17 m / s to 0.26 m / s. If the inner diameter (D1) is less than Φ6 mm, the heat radiation pipe may not be able to achieve a sufficient flow velocity in the pipe, while if it exceeds Φ7.9 mm, the flow velocity in the pipe may exceed the flow velocity suitable for the heat radiation pipe. Furthermore, for example, the outbound pipe or the return pipe may be formed by connecting pipes of different types of inner diameters (D1) of Φ7 mm and Φ8 mm, and having either the same or different pipe lengths, within a range in which the flow velocity in the pipe is 0.17 m / s to 0.26 m / s in the case of the rated supply flow rate.

[0015] The flow velocity within the heat dissipation pipe is preferably set to 0.10 m / s to 1.25 m / s when the rated supply flow rate is 0.50 L / min. If the flow velocity within the pipe is less than 0.10 m / s, the flow velocity is too slow and the water cools to a temperature that prevents heat dissipation while passing through the heat dissipation pipe, resulting in a failure to achieve a higher heat dissipation effect than conventional methods. Furthermore, if the flow velocity within the pipe exceeds 1.25 m / s, a more durable heat dissipation pipe must be selected, as an increase in wall thickness may result in a decrease in heat dissipation performance. Furthermore, the water may pass through the heat dissipation pipe before sufficient heat dissipation has occurred, resulting in a decrease in heating efficiency and fuel efficiency, which may result in a loss of economic viability. The inner diameter (D2) of the heat dissipation pipe can be set to one or more values ​​within the range of 0.10 m / s to 1.25 m / s, resulting in a flow velocity within the pipe when hot water is supplied to the heat exchange pipe at the rated supply flow rate. For example, it is possible to connect heat dissipation pipes of different inner diameters, Φ5.5 mm, Φ3 mm, and Φ1.7 mm, with either the same or different pipe lengths, as long as the flow velocity inside the pipe when hot water is supplied to the heat exchange pipe at the rated supply flow rate is in the range of 0.10 m / s to 1.25 m / s.

[0016] The rated supply flow rate of hot water is a flow rate that ensures the safety and durability of the floor heating hot water panel, particularly the heat exchange pipe, and that can be stably supplied from outside the floor heating hot water panel, for example, from a water heater, hot water supply piping, etc. The rated supply flow rate is a flow rate of hot water that can be most economically supplied by the water heater, hot water supply piping, etc. The rated supply flow rate of hot water can be, for example, 0.50 L / min, which is the rated supply flow rate of the water heater.

[0017] The hot water is a heat transfer fluid that is supplied from outside the floor heating hot water panel, flows through the heat exchange pipe, and provides heating by heat exchange. The hot water can be water, antifreeze, heat transfer oil, or other liquids. The hot water can be 20°C to 80°C, 30°C to 70°C, or 40°C to 70°C.

[0018] Furthermore, the present invention can be the floor heating hot water panel, in which the average value of the inner diameter (D2) of the heat radiation pipe is set within a range of Φ4.12 mm to Φ4.46 mm so that the flow velocity in the pipe is 0.47 m / s to 0.66 m / s when hot water is supplied at a rated supply flow rate, or the average value of the inner diameter (D2) of the heat radiation pipe is set within a range of Φ3.67 mm to Φ3.84 mm so that the flow velocity in the pipe is 0.65 m / s to 0.82 m / s when hot water is supplied at a rated supply flow rate, or the average value of the inner diameter (D2) of the heat radiation pipe is set within a range of Φ2.98 mm to Φ3.22 mm so that the flow velocity in the pipe is 0.94 m / s to 1.20 m / s when hot water is supplied at a rated supply flow rate.

[0019] By setting the average value of the inner diameter (D2) of the heat radiation pipe within any of the following ranges, Φ4.12 mm to Φ4.46 mm, Φ3.67 mm to Φ3.84 mm, or Φ2.98 mm to Φ3.22 mm, the piping can be configured more efficiently, resulting in improved heating efficiency. If the average value of the inner diameter (D2) of the heat radiation pipe is set to less than Φ4.12 mm, supplying hot water at a rated supply flow rate and maintaining a pipe flow velocity of 0.47 m / s to 0.66 m / s may result in a decrease in the pipe's durability and heat dissipation performance. If the average value of the inner diameter (D2) of the heat radiation pipe exceeds Φ4.46 mm, it becomes difficult to ensure a pipe flow velocity of 0.47 m / s to 0.66 m / s even when supplying hot water at a rated supply flow rate.

[0020] If the average value of the inner diameter (D2) of the heat radiation pipe is set to less than Φ3.67 mm, supplying hot water at the rated supply flow rate and maintaining a flow velocity in the pipe of 0.65 m / s to 0.82 m / s may result in a decrease in the durability and heat radiation performance of the pipe. If the average value of the inner diameter (D2) of the heat radiation pipe exceeds Φ3.84 mm, it becomes difficult to ensure a flow velocity in the pipe of 0.65 m / s to 0.82 m / s even when supplying hot water at the rated supply flow rate.

[0021] If the average value of the inner diameter (D2) of the heat radiation pipe is set to less than Φ2.98 mm, supplying hot water at the rated supply flow rate and maintaining a flow velocity in the pipe of 0.94 m / s to 1.20 m / s may result in a decrease in the durability and heat radiation performance of the pipe. If the average value of the inner diameter (D2) of the heat radiation pipe exceeds Φ3.22 mm, it becomes difficult to ensure a flow velocity in the pipe of 0.94 m / s to 1.20 m / s even when supplying hot water at the rated supply flow rate.

[0022] When the average inner diameter (D2) of the heat dissipation pipe is set to Φ4.12 mm to Φ4.46 mm, if the flow velocity in the pipe is less than 0.47 m / s, there is a risk that the air will cool down while passing through the pipe, and if it exceeds 0.66 m / s, the durability required of the heat dissipation pipe will be high, the wall thickness will increase, and heat dissipation performance will be reduced. When the average inner diameter (D2) of the heat dissipation pipe is set to Φ3.67 mm to Φ3.84 mm, if the flow velocity in the pipe is less than 0.65 m / s, there is a risk that the air will cool down while passing through the pipe, and if it exceeds 0.82 m / s, the durability required of the heat dissipation pipe will be high, and the wall thickness will increase, and heat dissipation performance will be reduced. Furthermore, when the average value of the inner diameter (D2) of the heat dissipation pipe is set to Φ2.98 mm to Φ3.22 mm, if the flow velocity in the pipe is less than 0.94 m / s, there is a risk that the air will cool down while passing through the pipe, and if it exceeds 1.20 m / s, the durability required of the heat dissipation pipe will increase, and the wall thickness will increase, which may result in a decrease in heat dissipation performance.

[0023] The present invention can also be a floor heating hot water panel in which the ratio (D1) / (D2) of the inner diameter (D1) of the outbound pipe or return pipe to the inner diameter (D2) of the heat dissipation pipe is set to be 1.223 to 4.168.

[0024] By setting the ratio of the inner diameter (D1) of the outgoing or return pipe to the inner diameter (D2) of the heat radiation pipe to 1.223 to 4.168, the amount of heat radiation above the floor can be improved. If the ratio of the inner diameter (D1) of the outgoing or return pipe to the inner diameter (D2) of the heat radiation pipe is less than 1.223, when multiple heat radiation pipes are connected between the outgoing pipe and the return pipe, a sufficient flow rate of hot water cannot be obtained by supplying the hot water at the rated supply flow rate. On the other hand, if the ratio exceeds 4.168, the hot water supplied at the rated supply flow rate will stagnate in the outgoing pipe for a long time, cooling and causing temperature unevenness in the floor heating hot water panel, which may prevent uniform heating over the entire surface.

[0025] The present invention can also be the floor heating hot water panel, wherein the ratio (T1) / (D1) of the inner diameter (D1) of the outgoing pipe or the return pipe to the minimum thickness (T1) of the cross section of the outgoing pipe or the return pipe is 0.20 to 0.30, and the ratio (T2) / (D2) of the inner diameter (D2) of the cross section of the heat radiation pipe to the minimum thickness (T2) of the cross section of the heat radiation pipe is 0.268 to 1.315.

[0026] By setting the (T1) / (D1) ratio to 0.20 to 0.30, the heat dissipation efficiency of the outbound or return pipe can be improved. If the (T1) / (D1) ratio is less than 0.20, the pressure resistance and heat resistance strength of the outbound or return pipe may decrease. Furthermore, if the (T1) / (D1) ratio exceeds 0.30, sufficient heat dissipation performance may not be achieved. The minimum thickness (T1) of the cross section of the outbound or return pipe is preferably set to the minimum thickness (T1) of the range that will be the upper surface of the outbound or return pipe when the floor heating hot water panel is installed, for example, which can increase the amount of heat dissipation from the upper surface of the floor heating hot water panel.

[0027] By setting the (T2) / (D2) ratio to 0.268 to 1.315, the heat dissipation efficiency of the heat dissipation pipe can be improved. If the (T2) / (D2) ratio is less than 0.268, the durability of the heat dissipation pipe may be reduced. If the (T2) / (D2) ratio exceeds 1.315, sufficient heat dissipation performance may not be ensured. The minimum wall thickness (T2) of the heat dissipation pipe is preferably set to the minimum wall thickness (T2) in the range that will be the upper surface of the heat dissipation pipe when the floor heating hot water panel is installed, for example, thereby increasing the amount of heat dissipation from the upper surface of the floor heating hot water panel.

[0028] The inner diameter (D1) of the cross section of the outward or return pipe, or the inner diameter (D2) of the heat radiation pipe, can be the diameter of the largest diameter portion of the flow path of each pipe. For example, it can be the inner diameter of a circular flow path, or the major diameter of an elliptical or oval flow path, or the length of the longest diagonal of a polygonal flow path. Furthermore, the inner diameter (D1) of the cross section of the outward or return pipe, or the inner diameter (D2) of the heat radiation pipe, can be the average value of the diameters of the flow paths of each pipe.

[0029] The present invention can also be the floor heating hot water panel, wherein the ratio (BT1) / (D1) of the inner diameter (D1) of the outgoing pipe or the return pipe to the bottom thickness (BT1) of the piping groove directly below the inner diameter (D1) of the outgoing pipe or the return pipe is 0.236 to 0.336, and the ratio (BT2) / (D2) of the inner diameter (D2) of the cross section of the heat dissipation pipe to the bottom thickness (BT2) of the piping groove directly below the heat dissipation pipe is 0.586 to 3.874.

[0030] The bottom thickness (BT) of the cross section of the piping groove of the insulation panel can be said to be the thickness dimension of the insulation material between the underside of the heat exchange pipe and the top surface of the floor underlayment material (such as plywood on joists and floor joists) of the building to which it is installed.

[0031] By setting the ratio (BT1) / (D1) to 0.236 to 0.336, the amount of heat dissipated to the floor can be increased. If the ratio of the bottom wall thickness (BT1) to the inner diameter (D1) is less than 0.236, the insulation performance under the floor will decrease, and heat loss to the floor will increase. If the ratio exceeds 0.336, the thickness of the insulation panel will increase, resulting in an increase in the thickness, size, and weight of the floor heating hot water panel, which will result in the disadvantage of narrowing the space inside the installation room, or the inner diameter (D1) of the outbound or inbound pipe will become smaller, which may result in an insufficient flow rate.

[0032] By setting the (BT2) / (D2) ratio to 0.586 to 3.874, the amount of heat dissipated to the floor can be increased. If the bottom thickness (BT2) / inner diameter (D2) ratio is less than 0.586, the insulation performance under the floor will decrease, and heat loss to the floor will increase. Furthermore, if it exceeds 3.874, the thickness of the insulation panel will increase, resulting in an increase in the thickness, size, and weight of the floor heating hot water panel, which will result in the drawback of narrowing the space inside the installation room or the inner diameter (D2) of the front heat dissipation pipe will become smaller, which may result in insufficient flow rate.

[0033] The present invention can also be a floor heating hot water panel in which the insulation panel has a metal foil layer for heat dissipation provided on the upper surface of the insulation panel and slits for absorbing thermal deformation engraved between the piping paths on the upper surface of the insulation panel.

[0034] The metal foil layer flushly finishes the upper surface of the insulation panel and the upper surface of the heat exchange pipe, efficiently transferring heat from the heat exchange pipe to the upper surface of the insulation panel, enabling more uniform heat dissipation with less unevenness. The metal foil layer can be made of aluminum, copper, zinc, or an alloy thereof, which have high thermal conductivity. The metal foil layer can be made of an aluminum-zinc alloy, a stainless steel alloy, or the like. The metal foil layer can have a thickness of, for example, 0.01 mm to 0.2 mm. The metal foil layer can be made of an aluminum alloy such as JIS (Japanese Industrial Standards) H14-8011 or H18-3003. JIS H18-3003 has excellent properties such as strength, corrosion resistance, hydrophilicity, water retention, dimensional accuracy, and flatness, making it a more suitable material for floor heating hot water panels.

[0035] The metal foil layer receives heat from the outbound pipe, inbound pipe, and heat dissipation pipe of the heat exchange pipe and thermally expands in various directions, causing deformation of the metal foil layer itself, but the slits allow strain to escape in the metal foil layer, preventing problems such as wrinkles, cracks, breakage, etc. Furthermore, the slits reduce the deformation stress that the insulation panel and the heat exchange pipe receive due to thermal expansion of the metal foil layer, preventing damage to the insulation panel and the heat exchange pipe.

[0036] The slits may be formed as continuous or discontinuous grooves along the upper edge of the piping groove, and may be formed as long cuts in the upper surface of the insulation panel excluding the heat exchange pipes and the piping groove, in a direction intersecting or perpendicular to the stress direction (compression or tension direction due to thermal expansion).

[0037] The present invention provides a floor heating system that utilizes the floor heating hot water panel, comprising at least one floor heating hot water panel laid on the floor and a hot water supply device connected to the heat exchange pipe and supplying hot water.

[0038] According to the floor heating system, the floor heating hot water panel, which receives hot water at the rated supply flow rate of the hot water heater, can achieve a better heating effect than conventional systems.

[0039] The water heater generates a pipe flow velocity of 0.17 m / s to 0.26 m / s in the outbound and inbound pipes by supplying hot water at the rated supply flow rate of the water heater, and further generates a pipe flow velocity of 0.10 m / s to 1.25 m / s in the heat dissipation pipe, thereby achieving floor heating that is superior to conventional types.

[0040] According to the floor heating system using the floor heating hot water panel of the present invention, it is possible to provide a floor heating hot water panel that can improve heating efficiency without increasing the temperature and flow rate of hot water. Also, it is possible to provide a thin and lightweight floor heating hot water panel by reducing the thickness of the insulation panel. Furthermore, it is possible to provide a floor heating hot water panel that reduces deformation due to its own heat. It is possible to provide a floor heating system using the floor heating hot water panel.

[0041] (a) Plan view of the floor heating system, (b) Figure 1 (a) Cross-sectional view of the G1-G1 portion of the floor heating hot water panel. (a) Cross-sectional view of the heat exchange pipe and heat insulation panel, (b) Cross-sectional view of the main portion of the heat insulation panel. (a) Plan view of an example of a slit in the floor heating hot water panel, (b) Figure 3 (a) Cross-sectional view of the G3-G3 portion of the floor heating hot water panel. (a) Plan view of another example of a slit in the floor heating hot water panel, (b) Figure 4 (a) Cross-sectional view of the G4-G4 portion of the floor heating hot water panel. Experimental equipment: (a) Plan view of the flooring (heat dissipation part) of the experimental body, (b) Side view of the experimental body, (c) Bottom view of the joists, heat insulation material, and base material. (a) Surface temperature distribution diagram of the floor heating hot water panel. Surface temperature distribution diagram of two underfloor heating hot water panels, (b) surface temperature distribution diagram of (1) in Figure 6(a) Surface temperature distribution diagram of underfloor heating hot water panels (a) Surface temperature distribution diagram of (2) in Figure 6(a) (b) Surface temperature distribution diagram of (3) in Figure 6(a) Graph of change in surface temperature of floor finishing material after heating starts Plan view showing measurement position of deformation due to heating of underfloor heating hot water panel Shows conceptual diagram of experimental equipment for pressure loss of circulating hot water in underfloor heating system (a) Conceptual diagram of experimental equipment with one insulating panel, (b) Conceptual diagram of experimental equipment with two insulating panels Graph of change in pressure versus flow rate for one underfloor heating hot water panel Graph of change in pressure versus flow rate for two underfloor heating hot water panels Drawing of test specimen installation in circulating hot water pressure loss test Drawing showing underfloor heating hot water panel in circulating hot water pressure loss test

[0042] Hereinafter, the floor heating hot water panel 2 according to this embodiment and the floor heating system 1 using the same will be specifically described with reference to the drawings. In particular, as shown in FIGS. 1 to 12 and Tables 1 to 5, the floor heating hot water panel 2 according to the present invention and the floor heating system 1 using the same were subjected to tests in accordance with the Excellent Housing Components Performance Test Method, Heating and Cooling System (Heating Unit) BLT HS / B-b-8:2020, heat dissipation characteristics (BLT HS / B-b-803), temperature rise characteristics after start of operation (BLT HS / B-b-801), surface temperature distribution (BLT HS / B-b-802), deformation characteristics due to heating (BLT HS / B-b-801A), and pressure loss of circulating hot water (BLT HS / B-b-817), and their heating performance was compared with that of conventional products.

[0043] As shown in Figure 1 and Table 1, the floor heating hot water panel 2 of this embodiment has a flat insulating panel 20 made of an insulating material such as closed-cell urethane resin or polystyrene foam, measuring 909 mm x 909 mm or 303 mm x 909 mm and 12.5 mm thick (PT), and the upper surface 21 of the insulating panel 20 is provided with piping grooves 200 at piping intervals of, for example, 100 mm. Table 1 shows the specifications of the floor heating system. As a result of the above-mentioned test, as will be described later, the floor heating hot water panel 2 of this embodiment was able to increase the ratio of above-floor heat radiation to total heat generation to 82.3% in this embodiment, compared to 74.0% in a conventional equivalent product.

[0044]

[0045] As will be described later, the test results of the floor heating hot water panel 2 of this embodiment showed that the ratio of the heat radiation amount above the floor to the total heat generation amount was 74.0% for a conventional equivalent product, but for this product it was possible to increase it to 82.3%. Therefore, by satisfying the characteristic conditions such as the ratio of the dimensions of each part of the floor heating hot water panel 2 of this embodiment and the flow velocity in the pipe, it can be said that it is possible to achieve heating performance superior to that of conventional types.

[0046] 1 to 4, a heat exchange pipe 3 is disposed within the piping groove 200, and the dimensions and shapes of the inner wall of the piping groove 200 and the outer wall of the heat exchange pipe 3 are set so that the upper surface 30 of the heat exchange pipe 3 is flush with the upper surface 21 of the insulation panel 20, and so that they are in close contact with each other. The piping groove 200 has an outward groove 201 and a return groove 202 that are parallel to each other on the upper surface 21 of the insulation panel 20, and one or more heat dissipation grooves 203 whose upstream ends are connected to the outward groove 201 and whose downstream ends are connected to the return groove 202. The outward groove 201 can be disposed so as to be continuous with the outward groove 201 of an adjacent insulation panel 20. Moreover, the return groove portion 202 can be arranged so as to be continuous with the return groove portion (202) of the adjacently arranged heat insulating panel (20).

[0047] The heat exchange pipe 3 is made of, for example, ethylene propylene diene rubber, and can be composed of an outgoing pipe 310 arranged in the outgoing groove 201, a returning pipe 320 arranged in the returning groove 202, and a heat dissipation pipe 330 arranged in the heat dissipation groove 203. The heat dissipation pipe 330 has an upstream end connected to the outgoing pipe 310 and a downstream end connected to the returning pipe 320.

[0048] The outward pipe 310 and the return pipe 320 may each have a flow path diameter (inner diameter D1) of 7 mm, and a vertical (L1)×horizontal (L2) dimension of 10.5 mm×10.5 mm of an outer wall cut surface perpendicular to the flow direction of the hot water 50. The heat radiation pipe 330 may have a flow path diameter (inner diameter D2) of 5.5 mm, and a vertical (L2)×horizontal (L2) dimension of 9 mm×9 mm of an outer wall cut surface perpendicular to the flow direction of the hot water 50, or a flow path diameter (inner diameter D2) of 3 mm, and a vertical (L2)×horizontal (L2) dimension of 6 mm×10 mm of an outer wall cut surface perpendicular to the flow direction of the hot water 50, or a flow path diameter (inner diameter D2) of 1.7 mm, and a vertical (depth)×horizontal (width) dimension of 6 mm×10 mm of an outer wall cut surface perpendicular to the flow direction of the hot water 50. The upper surface 21 of the insulation panel 20, including the upper surfaces 30 of the outbound pipe 310, the return pipe 320 and the heat dissipation pipe 330 of the heat exchange pipe 3, has a metal foil layer 4 formed by adhering a metal foil made of an aluminum-zinc alloy having a thickness of, for example, 0.01 mm to 0.2 mm to almost the entire surface.

[0049] When the ratio (D1) / (D2) of the inner diameter (D1) of the outbound pipe 310 or the inbound pipe 320 to the inner diameter (D2) of the heat radiation pipe 330 is calculated, (D1)Φ7mm / (D2)Φ5.5 is 1.273, which becomes 1.223 after subtracting 0.05 as an error. Also, (D1)Φ7mm / (D2)Φ1.7 is 4.118, which becomes 4.168 after adding 0.05 as an error. Therefore, by setting (D1) / (D2) so that it is 1.223 to 4.168, it is possible to improve heating efficiency compared to conventional types.

[0050] The minimum cross-sectional thickness (T1) of the 7 mm diameter outward pipe 310 and the return pipe 320 is calculated to be 1.75 mm from the following formula (1). The minimum cross-sectional thickness (T2) of the 5.5 mm diameter heat radiation pipe 330 is calculated to be 1.75 mm from the following formula (1). The minimum cross-sectional thickness (T2) of the 3 mm diameter heat radiation pipe 330 is calculated to be 1.5 mm. The minimum cross-sectional thickness (T2) of the 1.7 mm diameter heat radiation pipe 330 is calculated to be 2.15 mm from the following formula (1).

[0051] [Mathematical Expression 1] T = (L - D) / 2 In the above formula, T is the minimum wall thickness, L is the vertical dimension of the outer wall, and D is the inner diameter of the pipe. It is desirable that the width (horizontal dimension of the outer wall) of the heat radiation pipe is greater than its thickness (vertical dimension of the outer wall). This is because reducing the minimum wall thickness can improve the heat transfer effect of hot water, and increasing the width can increase the strength of the heat radiation pipe. Therefore, it is desirable that the width (horizontal dimension of the outer wall) of the heat radiation pipe be 1.2 times or more, and preferably 1.5 times or more, of its thickness (vertical dimension of the outer wall).

[0052] The minimum thickness (T1) of the cross section of the outbound pipe 310 and the return pipe 320 divided by the inner diameter (D1) of the heat exchange pipe is 1.75 mm / Φ7 mm = 0.25 when the inner diameter (D1) is Φ7 mm, and if an error of ±0.05 is included, it is preferable that the ratio be in the range of 0.20 to 0.30.

[0053] The ratio of the minimum cross-sectional thickness (T2) of the heat radiation pipe 330 to the inner diameter (D2) of the heat exchange pipe is 1.75 mm / Φ5.5 = 0.318 when the inner diameter (D2) is Φ5.5, and preferably ranges from 0.268 to 0.368, assuming an error of ±0.05. Furthermore, when the inner diameter (D2) is Φ3, the ratio is 1.5 mm / Φ3 = 0.5, and preferably ranges from 0.45 to 0.55, assuming an error of ±0.05. Furthermore, when the inner diameter (D2) is Φ1.7, the ratio is 2.15 mm / Φ1.7 = 1.265, and preferably ranges from 1.215 to 1.315, assuming an error of ±0.05. Therefore, the minimum thickness (T2) of the cross section of the heat radiation pipe 330 / the inner diameter (D2) of the heat exchange pipe can be set in the range of 0.268 to 1.315.

[0054] The ratio of the inner diameter (D1) of the cross section of the outbound pipe 310 and the return pipe 320 to the bottom thickness (BT1) of the cross section of the outbound groove 201 and the return groove 202 of the piping path 200 of the insulation panel 20, that is, the bottom thickness (BT1) / inner diameter (D1), is such that when the inner diameter (D1) is Φ7, the bottom thickness (BT1) is (thickness (PT) of the insulation panel 20 12.5 mm) - (vertical dimension (L1) of the outbound pipe 310 (return pipe 320) 10.5 mm) = 2 mm, and 2 mm / Φ7 mm = 0.286, which, if an error of ±0.05 is included, should be 0.236 to 0.336.

[0055] The ratio of the inner diameter (D2) of the cross section of the heat dissipation pipe 330 to the bottom thickness (BT2) of the cross section of the heat dissipation groove portion 203 of the piping path 200 of the insulation panel 20, i.e., bottom thickness (BT2) / inner diameter (D2), is as follows: if the inner diameter (D2) of the cross section of the heat dissipation pipe 330 is Φ5.5 mm, the bottom thickness (BT2) is (thickness (PT) of the insulation panel 20 12.5 mm) - (vertical dimension (L2) of the heat dissipation pipe 330 9 mm) = 3.5 mm, and 3.5 mm / Φ5.5 mm = 0.636, which, if an error of ±0.05 is included, should be 0.586 to 0.686.

[0056] When the inner diameter (D2) of the cross section of the heat dissipation pipe 330 is Φ3 mm, the bottom thickness (BT2) is (thickness (PT) of the insulation panel 20 12.5 mm) - (vertical dimension (L2) of the heat dissipation pipe 330 6 mm) = 6.5 mm, and (BT2) / (D2) is 6.5 mm / Φ3 mm = 2.167, which, if an error of ±0.05 is included, should be set to 2.117 to 2.217.

[0057] When the inner diameter (D2) of the cross section of the heat dissipation pipe 330 is Φ1.7 mm, the bottom thickness (BT2) is (thickness of the insulation panel 20 12.5 mm) - (vertical dimension of the heat dissipation pipe 330 6 mm) = 6.5 mm, and (BT2) / (D2) is 6.5 mm / Φ1.7 mm = 3.824, which, if an error of ±0.05 is included, should be set to 3.774 to 3.874.

[0058] Therefore, when the inner diameter (D2) of the cross section of the heat radiation pipe 330 is Φ5.5 to Φ1.7, the bottom wall thickness (BT2) / inner diameter (D2) can be in the range of 0.586 to 3.874.

[0059] As mentioned above, when the inner diameter (D2) is Φ5.5 mm to Φ3 mm, it is preferable that the ratio (BT2) / (D2) of the inner diameter (D2) of the cross section of the heat dissipation pipe 330 to the bottom thickness (BT2) of the piping groove 200 directly below the heat dissipation pipe 330 is 0.586 to 2.217.

[0060] (Test equipment for heat dissipation characteristics) This experiment was conducted using the equipment shown in Figures 5 and 13, and the floor heating hot water panel 2 shown in Figure 14, in accordance with the Quality Housing Components Performance Test Method Manual Heating and Cooling Systems (Floor Heating Units) BLT HS / B-b-8:2020 Heat Dissipation Characteristics (BLT HS / B-b-803). The test room (constant temperature room) had dimensions of 5400 mm x 4500 mm x height 3736 mm, and used 100 mm thick urethane insulation panels as insulation, with a set temperature range of -15°C to +15°C. 5 and 14, two of the floor heating hot water panels 2 were joined together to form a rectangular shape in plan view and laid on an underfloor structure 6 installed horizontally in the test room, and a 12 mm thick floor finishing material (flooring) 60 was placed on the two floor heating hot water panels 2, and the test was conducted with both the two floor heating hot water panels 2 and the floor finishing material 60 stacked horizontally. The underfloor structure 6 was an integrated structure consisting of a top plywood panel measuring 2680 mm x 1180 mm x 12 mm thick and a bottom plywood panel measuring 2680 mm x 1180 mm x 6 mm thick, with multiple 45 mm thick joists and multiple 45 mm thick insulating materials sandwiched between them to fill the gaps between the joists. A water heater 5 is connected to the heat exchange pipe 3 of the floor heating hot water panel 2 so as to circulate hot water, and the hot water 50 at 40° C. to 70° C. is circulated at a rated supply flow rate of 0.50 L / min.

[0061] (Test results of heat dissipation characteristics) The inlet temperature of the hot water 50 to the heat exchange pipe 3 is 60.37°C, the outlet temperature of the heat exchange pipe 3 is 53.06°C, and the rated supply flow rate of the hot water 50 to the heat exchange pipe 3 is 0.50 L / min. As a result of the experiment, the heat radiation amount Q of the heat exchange pipe 3 was 255.0 W, the actual heat radiation amount Q' of the floor heating hot water panel 2 was 233.6 W, the above-floor heat radiation amount Qg was 192.3 W (proportion of the total heat generation amount: 82.3%), the under-floor heat radiation amount Qd = Q' - Qg was 41.3 W (proportion of the total heat generation amount: 17.7%), the ratio of the measurement area by the heat flow meter to the heat radiation area was 93.6%, the above-floor average air temperature θi was 18.0°C, the under-floor average air temperature θo was 4.0°C, the above-floor surface average temperature θis was 28.4°C, the under-floor surface average temperature θos was 5.5°C, and the above-floor globe temperature θ Ｂ is 18.3℃ (△θ Ｂ = θ Ｂ― θ ｉ =0.3), indoor wall surface temperature θ us is 17.6℃, and the outdoor wall surface temperature θ ds The actual heat radiation amount Q' of the floor heating hot water panel 2 was calculated by the following [Equation 2].

[0062] [Math 2] Q'=Q・(L-L １ One L ２ ) / L(W) L: Total pipe length from the inlet temperature measurement position to the outlet temperature measurement position L １ : Pipe length from the panel inlet to the inlet temperature measurement position L ２ : Pipe length from the panel outlet to the outlet temperature measurement position

[0063] (Flow velocity in the pipe) As shown in Table 2, the flow velocity in the pipe (panel flow velocity) was compared between the floor heating hot water panel 2 of this embodiment (insulation panel 20 thickness: 12 mm) and a conventional floor heating hot water panel (insulation panel thickness: 15 mm). Table 2 shows the experimental results of the flow velocity in the pipe of the floor heating hot water panel 2. The rated supply flow rate of the hot water 50 of the hot water supply device 5 is 0.5 L / min. When the inner diameter (D1) of the outbound pipe 310 and the inbound pipe 320 (main piping in the upper row of Table 2) of the heat exchange pipe 3 of this embodiment is Φ7 mm, the panel flow rate was 22.05 L / min and the flow velocity in the pipe was 0.21 m / s. In the case of the floor heating hot water panel 2 of this embodiment, which is 909 mm x 909 mm x 12 mm thick (type 909H in the upper row of Table 2), when the inner diameter (D2) of the heat dissipation pipe 330 of the heat exchange pipe 3 of this embodiment is Φ5.5 mm and Φ3.0 mm (average Φ3.72 mm), the panel flow rate was 0.5 L / min and the flow velocity in the pipe was 0.77 m / s.

[0064]

[0065] Furthermore, in the case of the floor heating hot water panel 2 of this embodiment, which is 909 mm x 303 mm x 12 mm thick (303T type in the upper row of Table 2), when the inner diameter (D2) of the heat dissipation pipe 330 of the heat exchange pipe 3 is Φ5.5 mm and Φ1.7 mm (average Φ4.17 mm), the panel flow rate was 0.26 L / min and the flow velocity inside the pipe was 0.61 m / s.

[0066] Furthermore, in the case of the floor heating hot water panel 2 of this embodiment, which is 909 mm x 303 mm x 12 mm thick (303Y type in the upper row of Table 2), when the inner diameter (D2) of the heat dissipation pipe 330 of the heat exchange pipe 3 is Φ5.5 mm and Φ1.7 mm (average Φ3.03 mm), the panel flow rate is 0.09 L / min and the flow velocity inside the pipe is 1.15 m / s.

[0067] (Flow velocity in conventional pipes) When the inner diameter (D1) of the outbound and inbound pipes (main piping in the lower part of Table 2) of the heat exchange pipes of a conventional floor heating hot water panel was Φ8 mm, the panel flow rate was 30.31 L / min and the flow velocity in the pipes was 0.16 m / s. For a conventional floor heating hot water panel of 909 mm x 909 mm x 15 mm thick (909H type in the lower part of Table 2), when the inner diameter (D2) of the heat radiation pipe 330 of the heat exchange pipe was Φ6.0 mm and Φ3.0 mm (average Φ3.89 mm), the panel flow rate was 0.57 L / min and the flow velocity in the pipes was 0.70 m / s.

[0068] Furthermore, for a conventional floor heating hot water panel measuring 909 mm x 303 mm x 15 mm thick (303T type in the bottom row of Table 2), when the inner diameter (D2) of the heat exchange pipe 330 of the heat radiation pipe was Φ6.0 mm and Φ1.7 mm (average Φ4.51 mm), the panel flow rate was 0.31 L / min and the flow velocity in the pipe was 0.52 m / s.

[0069] Furthermore, for a conventional floor heating hot water panel measuring 909 mm x 303 mm x 15 mm thick (303Y type in the lower row of Table 2), when the inner diameter (D2) of the heat exchange pipe 330 of the heat dissipation pipe was Φ6.0 mm and Φ1.7 mm (average Φ3.27 mm), the panel flow rate was 0.13 L / min and the flow velocity in the pipe was 0.99 m / s.

[0070] From the above experimental results of the flow velocity in the pipes, when hot water is supplied at a rated supply flow rate to the forward pipe 310 and the return pipe 320 (main pipe) in this embodiment, whose inner diameter (D1) of the heat exchange pipe 3 is Φ7 mm (main pipe), the flow velocity in the pipes is 0.21 m / s, and when hot water 50 is supplied at a rated supply flow rate to the conventional forward pipe 310 and return pipe 320 having an inner diameter (D1) of Φ8 mm, the flow velocity in the pipes is 0.16 m / s. Therefore, it is desirable that the flow velocity in the outgoing pipe 310 and the return pipe 320 when the hot water 50 is supplied at a rated supply flow rate to the outgoing pipe 310 and the return pipe 320 be set to 0.17 m / s or more, which is slightly higher than the conventional pipe flow velocity of 0.16 m / s, and further set to 0.26 m / s or less, which is the pipe flow velocity of 0.21 m / s in the outgoing pipe 310 and the return pipe 320 of this embodiment plus an error (+0.05 m / s). In other words, it is desirable that the inner diameter (D1) of the outgoing pipe 310 and the return pipe 320 be set in the range of Φ6 (Φ7 mm - (error 1.0)) to Φ7.9 (Φ8 mm - (error 0.1)) so that the pipe flow velocity is 0.17 m / s to 0.21 m / s when the hot water 50 is supplied at a rated supply flow rate.

[0071] When hot water 50 was supplied at the rated supply flow rate to the heat radiation pipe 330 of the heat exchange pipe of this embodiment, the flow velocity in the pipe was 0.61 m / s when the average inner diameter (D2) of the heat radiation pipe 330 was Φ4.17 mm (top row, Table 2, Type 303T).When the average inner diameter (D2) of the conventional heat radiation pipe 330 was Φ4.51 mm (bottom row, Table 2, Type 303T), the flow velocity in the pipe was 0.52 m / s.

[0072] Therefore, when the heat dissipation pipe 330 supplies hot water 50 at the rated supply flow rate, it is desirable to set the average inner diameter (D2) of the heat dissipation pipe 330 within the range of Φ4.12 mm (Φ4.17 mm - (error 0.05 mm)) to Φ4.46 mm (Φ4.51 - ((error 0.05 mm)) so that the flow velocity inside the pipe is 0.47 m / s (0.52 m / s - (error 0.05 m / s)) to 0.66 m / s (0.61 m / s + (error 0.05 m / s)).

[0073] When hot water 50 was supplied at the rated supply flow rate to the heat radiation pipe 330 (909H type) of the heat exchange pipe of this embodiment, the flow velocity in the pipe was 0.77 m / s when the average inner diameter (D2) of the heat radiation pipe 330 was Φ3.72 mm (top row, 909H type, Table 2).When the average inner diameter (D2) of the conventional heat radiation pipe 330 was Φ3.89 mm (bottom row, 909H type, Table 2), the flow velocity in the pipe was 0.70 m / s.

[0074] Therefore, when the heat dissipation pipe 330 supplies hot water 50 at the rated supply flow rate, it is desirable to set the average inner diameter (D2) of the heat dissipation pipe 330 within the range of Φ3.67 mm (Φ3.72 mm - (error 0.05 mm)) to Φ3.84 mm (Φ3.89 - ((error 0.05 mm)) so that the flow velocity inside the pipe is 0.65 m / s (0.70 m / s - (error 0.05 m / s)) to 0.82 m / s (0.77 m / s + (error 0.05 m / s)).

[0075] When hot water 50 was supplied at the rated supply flow rate to the heat radiation pipe 330 of the heat exchange pipe, the flow velocity in the pipe was 1.15 m / s when the average inner diameter (D2) of the heat radiation pipe 330 was Φ3.03 mm (Table 2, upper row, 303Y type).When the average inner diameter (D2) of the conventional heat radiation pipe 330 was Φ3.27 mm (Table 2, lower row, 303Y type), the flow velocity in the pipe was 0.99 m / s.

[0076] Therefore, when the heat dissipation pipe 330 supplies hot water 50 at the rated supply flow rate, it is desirable to set the average inner diameter (D2) of the heat dissipation pipe 330 within the range of Φ2.98 mm (Φ3.03 mm - (error 0.05 mm)) to Φ3.22 mm (Φ3.27 - ((error 0.05 mm)) so that the flow velocity inside the pipe is 0.94 m / s (0.99 m / s - (error 0.05 m / s)) to 1.20 m / s (1.15 m / s + (error 0.05 m / s)).

[0077] In other words, the flow velocity in the heat dissipation pipe 330 is set to 0.10 m / s or more, which is slightly higher (+0.01 m / s) than the maximum flow velocity of 0.99 m / s in the conventional heat dissipation pipe 330 (303Y type in the lower row of Table 2).Furthermore, it is set to less than 1.25 m / s, which is the maximum flow velocity in the pipe of this embodiment, 1.15 m / s, of the heat dissipation pipe 330 (303Y type in the upper row of Table 2), plus +0.10 m / s as an error.

[0078] As mentioned above, it has been found that the floor heating hot water panel 2 of this embodiment can achieve a higher heating efficiency (the proportion of the above-floor heat radiation Qg of 192.3 W to the total heat generation: 82.3%) than the conventional type (the proportion of the above-floor heat radiation Qu of 173.4 W to the total heat generation: 74.0%). Therefore, it is desirable to set the inner diameter (D2) of the heat radiation pipe 330 so that the flow velocity in the pipe is 0.10 m / s to 1.25 m / s when hot water 50 is supplied at the rated supply flow rate.

[0079] In a previous heat dissipation characteristic (BLT HS / B-b-803) test (test date: February 22, 2017) conducted on a conventional 15 mm thick floor heating hot water panel, the inlet temperature of the heat exchange pipe 3 for the hot water 50 was 60.06°C, the outlet temperature of the heat exchange pipe 3 was 53.67°C, and the rated supply flow rate of the hot water 50 to the heat exchange pipe was 0.57 L / min. As a result of the experiment, the heat radiation amount Q of the heat exchange pipe was 256.0 W, the actual heat radiation amount Q' of the floor heating hot water panel was 234.4 W, the heat radiation amount above the floor Qu was 173.4 W (percentage of the total heat generation amount: 74.0%), the heat radiation amount below the floor Qd = Q' - Qu was 61.0 W (percentage of the total heat generation amount: 26.0%), the percentage of the measurement area by the heat flow meter to the heat radiation area was 88.2%, and the average air temperature above the floor θ ｉ is 17.8°C, the average underfloor air temperature θo is 4.5°C, the average floor surface temperature θis is 26.6°C, the average underfloor surface temperature θos is 4.6°C, the floor globe temperature θ Ｂ is 17.9℃ (△θ Ｂ = θ Ｂ― θ ｉ =0.1), indoor wall surface temperature θ us is 17.6℃, and the outdoor wall surface temperature θ ds The temperature was 4.5°C.

[0080] As mentioned above, compared to the above-floor heat dissipation amount Qu of 173.4 W (74.0% of the total heat dissipation amount) of a conventional floor heating hot water panel, the floor heating hot water panel 2 of this embodiment has an above-floor heat dissipation amount Qg of 192.3 W (82.3% of the total heat dissipation amount), thereby achieving more efficient heating. Furthermore, while the flow velocity in the pipe of the conventional floor heating hot water panel was 0.52 m / s to 0.99 m / s, the flow velocity in the pipe of the floor heating hot water panel 2 of this embodiment was 0.21 m / s to 1.15 m / s. This demonstrates that the floor heating hot water panel 2 of this embodiment has a faster flow velocity in the pipe compared to the conventional type, resulting in superior heating efficiency. In this embodiment, the pipe flow velocity of the floor heating hot water panel 2 can be set between a flow velocity faster than the conventional pipe flow velocity of 0.99 m / s and a flow velocity equivalent to the 1.15 m / s of this embodiment, thereby improving heating efficiency. Therefore, as mentioned above, it is desirable to set the pipe flow velocity of the outgoing and return pipes to approximately 0.17 m / s to 0.26 m / s and the pipe flow velocity of the heat dissipation pipe to approximately 0.10 m / s to 1.25 m / s. In the above experimental example, even if the average inner diameter (D2) of the heat dissipation pipe 330 is the same, by reducing the inner diameters of the outgoing and return pipes 310 and 320 and increasing the flow velocity of the liquid flowing therethrough, the velocity of the liquid flowing into and out of the heat dissipation pipe 330 can be increased, thereby increasing the liquid flow velocity throughout each floor heating hot water panel. It is believed that this has resulted in a significant improvement in the amount of heat dissipated above the floor in the floor heating hot water panel 2 of this embodiment compared to the conventional floor heating hot water panel 2.

[0081] (Test of temperature rise characteristics and surface temperature distribution after the first start of operation) Using the equipment shown in Figs. 5 and 13, and the floor heating hot water panel 2 shown in Fig. 14, the floor heating hot water panel 2 was placed on a stand for installing a test specimen, and tests were conducted on the temperature rise characteristics and surface temperature distribution after the start of operation in accordance with the temperature rise characteristics (BLT HS / B-b-801) and surface temperature distribution (BLT HS / B-b-802) after the start of operation in the Excellent Housing Component Performance Test Method Manual Heating and Cooling System (Floor Heating Unit) BLT HS / B-b-8:2020. (First surface temperature distribution test results) Test date: July 15, 2022 The test results are shown in Figures 6 to 8. The floor surface temperatures were 30.1 ° C at measurement point (A), 29.1 ° C at measurement point (B), 28.1 ° C at measurement point (C), 30.4 ° C at measurement point (D), and 29.1 ° C at measurement point (E). The temperature in the test room was 18.3 ° C, the wall surface temperature in the test room was 17.9 ° C, the inlet temperature of the hot water 50 of the floor heating hot water panel 2 was 61.1 ° C, the outlet temperature of the hot water 50 of the floor heating hot water panel 2 was 54.5 ° C, and the flow rate of the hot water 50 of the floor heating hot water panel 2 was 0.52 L / min. The areas indicated by the line frames (1) and (3) in Figure 6 (a) indicate the areas of the first and second floor heating hot water panels 2, and the line frame (2) indicates the joint position between the two floor heating hot water panels 2.

[0082] (Second surface temperature distribution test results) Test date: August 4, 2022 The test results are not shown, but only the results are shown. The floor surface temperatures were 23.0°C at measurement point (A) in Figure 6, 23.8°C at measurement point (B), 21.1°C at measurement point (C), 23.1°C at measurement point (D), and 23.5°C at measurement point (E). The temperature in the test room was 18.8°C, the wall surface temperature in the test room was 18.7°C, the inlet temperature of the hot water 50 of the floor heating hot water panel 2 was 60.5°C, the outlet temperature of the hot water 50 of the floor heating hot water panel 2 was 56.8°C, and the flow rate of the hot water 50 of the floor heating hot water panel 2 was 0.50 L / min.

[0083] (Test results of temperature rise characteristics after operation start) Test date: July 14, 2022 The time until the surface temperature reached 80% of the difference between the saturated surface temperature and the room temperature at that time was measured. In Figure 6, the time was 28 minutes at measurement point (A), 34 minutes at measurement point (B), 32 minutes at measurement point (C), 27 minutes at measurement point (D), and 33 minutes at measurement point (E), with an average of 31 minutes. The test results of the temperature rise characteristics after operation start are shown in Figure 8.

[0084] (Test of deformation characteristics due to heating) Test period: August 17, 2022 to August 19, 2022 In this experiment, in order to confirm the deformation characteristics due to heating of the floor heating hot water panel 2, the test items shown in the deformation characteristics due to heating (BLT HS / B-b-810A) were carried out in accordance with the Good Housing Components Performance Test Method Book Heating and Cooling System (Floor Heating Unit) BLT HS / B-b-8:2020. 9, the deformation characteristic test due to heating was performed by installing digital dial gauges in six directions, namely, horizontal directions CH1 and CH2 perpendicular to the outer side walls of the two insulating panels 20 that form the short sides of the rectangle, horizontal directions CH3 and CH4 perpendicular to the outer side walls of one of the insulating panels 20 that form each long side of the rectangle, and vertical directions CH5 and CH6 perpendicular to the upper surfaces 21 of the two insulating panels 20 near the mutual joint ends of the two insulating panels 20, to measure the deformation amount. The deformation characteristic test due to heating was performed in the same manner as in the test device, with the floor finishing material (flooring) 60 stacked on top of the two floor heating hot water panels 2.

[0085] The displacement in the long side direction of the two floor heating hot water panels 2 joined to form a rectangle in plan view was δ1 = (CH1 + CH2), the displacement in the short side direction was δ2 = (CH3 + CH4), and the lift displacement was δ3 = Max (CH5 or CH6). The test results for deformation characteristics due to heating are shown in Table 3, where the displacement in the long side direction δ1 was 0.1 mm, the displacement in the short side direction δ2 was 0.1 mm, and the lift displacement in the upward direction δ3 was 0.5 mm. Table 3 is a table of specifications for the floor heating hot water panel 2 and the heat exchange pipe 3.

[0086]

[0087] As shown in Figures 3 and 4, the floor heating hot water panel 2 is provided with slits 40 to prevent damage such as wrinkles, cracks, and tears due to plastic deformation of the metal foil layer 4 caused by deformation of the insulation panel 20 due to heating. The slits 40 are effective enough to interrupt the continuity of the metal foil layer 4, so the gap dimension 41 between the opening edges of the slits 40 can be essentially 0 mm. The slits 40 can be formed by cutting the metal foil layer 4 along the opening edges of the piping grooves 200, or can be distributed at approximately equal intervals of, for example, 20 mm to 100 mm on the upper surface 21 of the insulation panel 20 excluding the piping grooves 200, so that shear forces acting in the planar (horizontal) direction on the metal foil layer 4 can be interrupted.

[0088] (Circulating Hot Water Pressure Loss Test) In this experiment, in order to confirm the pressure loss of the floor heating hot water panel 2, the Good Housing Component Performance Test Method Manual Heating and Cooling System (Floor Heating Unit) BLT HS / B-b-8:2020 18. Circulating Hot Water Pressure Loss BLT HS / B-b-817) was performed in accordance with the. As described above, an experiment was conducted using the floor heating hot water panel 2 shown in FIG. 14 in the equipment shown in FIGS. 5 and 13. The test conditions were as shown in FIG. 14. Experiments were conducted using one test specimen and two specimens arranged in parallel. As shown in FIG. 10(a), the floor heating hot water panel 2 (909 mm x 909 mm) was used in one case, and as shown in FIG. 10(b), the floor heating hot water panel 2 (909 mm x 909 mm) was used in two cases. As shown in Figures 10(a) and (b), a constant temperature water circulation device 52 was placed at a position corresponding to the hot water supply device 5, and measurements were taken by installing instruments 7, including an inlet pressure gauge 70, an outlet pressure gauge 71, and an ultrasonic flow meter 72, in each device.

[0089] As shown in Table 4 below and Figure 11, when there was one floor heating hot water panel 2, a pressure loss of 12.9 kPa to 39.1 kPa occurred with a change in flow rate of 0.21 L / min to 0.50 L / min. Table 4 shows the pressure loss for one floor heating hot water panel 2, and Figure 11 shows the experimental results when there was one floor heating hot water panel 2.

[0090] As shown in Table 5 below and Figure 12, when there were two floor heating hot water panels 2, a pressure loss of 63.8 kPa to 17.7 kPa occurred with a change in flow rate of 1.2 L / min to 0.6 L / min. Table 5 shows the pressure loss for two floor heating hot water panels 2 with respect to the flow rate, and Figure 12 shows the experimental results for the case of two floor heating hot water panels.

[0091]

[0092] The floor heating hot water panel of the present invention and the floor heating system using it can be used for floor heating in buildings, as well as for heating systems for rock baths, heating systems for agricultural greenhouses, snow melting and snow removal systems for outdoor pavements or building roofs, and heating systems for water tanks, etc.

[0093] 1 Floor heating system 2 Floor heating hot water panel 20 Insulation panel (PT) 21 Thickness of insulation panel 21 Top surface 23 Bottom surface 200 Pipe groove 201 Outgoing groove 202 Return groove 203 Heat dissipation groove (BT1) Bottom thickness of outgoing groove or return groove (BT2) Bottom thickness of heat dissipation groove 3 Heat exchange pipe 30 Top surface 310 Outgoing pipe 311 Top surface (D1) Inner diameter (L1) Vertical (depth) dimension 320 Return pipe 321 Top surface (T1) Minimum thickness 330 Heat dissipation pipe 331 Top surface (D2) Inner diameter (or average inner diameter) (L2) Vertical (depth) dimension (T2) Minimum wall thickness 4 Metal foil layer 40 Slit 41 Gap dimension 5 Hot water heater 50 Hot water 52 Constant temperature water circulation device 6 Underfloor structure 60 Floor finishing material (flooring) 7 Meters 70 Inlet pressure gauge 71 Outlet pressure gauge 72 Ultrasonic flow meter

Claims

1. A heat exchanger comprising: a flat heat insulating panel of a predetermined thickness made of heat insulating material; a piping groove recessed in the upper surface of the heat insulating panel; and a heat exchange pipe arranged in the piping groove, wherein the piping groove has an outgoing groove portion and a return groove portion, and a heat dissipation groove portion whose upstream end is connected to the outgoing groove portion and whose downstream end is connected to the return groove portion; the heat exchanger pipe comprises an outgoing pipe arranged in the outgoing groove portion, a return pipe arranged in the return groove portion, and a heat dissipation pipe arranged in the heat dissipation groove portion, whose upstream end is connected to the outgoing pipe and whose downstream end is connected to the return pipe; the inner diameters (D1) of the outgoing pipe and the return pipe are set so that the flow velocity in the pipe when hot water is supplied to the heat exchanger pipe at a rated supply flow rate is 0.17 m / s to 0.26 m / s; The inner diameter (D2) of the heat radiation pipe is set so that the flow velocity in the pipe when hot water is supplied to the heat exchange pipe at a rated supply flow rate is 0.10 m / s to 1.25 m / s.

2. A floor heating hot water panel as described in claim 1, wherein the inner diameter (D1) of the outbound pipe and the inbound pipe is set within the range of Φ6 mm to Φ7.9 mm so that when hot water is supplied at the rated supply flow rate, the flow velocity within the pipe is 0.17 m / s to 0.21 m / s.

3. The floor heating hot water panel according to claim 1, wherein the average value of the inner diameter (D2) of the heat radiation pipe is set to be in the range of Φ4.12 mm to Φ4.46 mm so that the flow velocity in the pipe is 0.47 m / s to 0.66 m / s when hot water is supplied at a rated supply flow rate, or the average value of the inner diameter (D2) of the heat radiation pipe is set to be in the range of Φ3.67 mm to Φ3.84 mm so that the flow velocity in the pipe is 0.65 m / s to 0.82 m / s when hot water is supplied at a rated supply flow rate, or the average value of the inner diameter (D2) of the heat radiation pipe is set to be in the range of Φ2.98 mm to Φ3.22 mm so that the flow velocity in the pipe is 0.94 m / s to 1.20 m / s when hot water is supplied at a rated supply flow rate.

4. A floor heating hot water panel as described in claim 1, wherein the ratio (D1) / (D2) of the inner diameter (D1) of the outbound pipe or return pipe to the inner diameter (D2) of the heat dissipation pipe is set to be 1.223 to 4.

168.

5. A floor heating hot water panel according to claim 1, wherein the ratio (T1) / (D1) of the inner diameter (D1) of the outgoing pipe or return pipe to the minimum thickness (T1) of the cross section of the outgoing pipe or return pipe is 0.20 to 0.30, and the ratio (T2) / (D2) of the inner diameter (D2) of the cross section of the heat radiation pipe to the minimum thickness (T2) of the cross section of the heat radiation pipe is 0.268 to 1.

315.

6. A floor heating hot water panel as claimed in claim 1, wherein the ratio (BT1) / (D1) of the inner diameter (D1) of the outgoing pipe or return pipe to the bottom thickness (BT1) of the piping groove directly below the inner diameter (D1) of the outgoing pipe or return pipe is 0.236 to 0.336, and the ratio (BT2) / (D2) of the inner diameter (D2) of the cross section of the heat radiation pipe to the bottom thickness (BT2) of the piping groove directly below the heat radiation pipe is 0.586 to 3.

874.

7. A floor heating hot water panel as claimed in claim 1, wherein the insulating panel has a metal foil layer for heat dissipation provided on the upper surface of the insulating panel, and slits for absorbing thermal deformation engraved between the piping paths on the upper surface of the insulating panel.

8. A floor heating system using the floor heating hot water panel according to any one of claims 1 to 4, comprising at least one floor heating hot water panel laid on the floor, and a hot water supply device connected to the heat exchange pipe and supplying hot water.

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