JP2008039381A - Synthetic resin pipe for radiant cooling and heating, and panel for radiant cooling and heating - Google Patents

Abstract

The present invention provides a synthetic resin tube for radiant cooling and heating having an excellent radiant cooling and heating effect and moderate flexibility and independence, and a radiant cooling and heating panel using the same.
At least a heat radiation layer provided in an outermost layer, a heat conduction layer provided on an inner surface side of the heat radiation layer, and a metal provided between the heat radiation layer and the heat conduction layer A synthetic resin tube for radiant cooling and heating having a layer, wherein the heat radiation layer has a thermal emissivity of 0.85 or more.
[Selection] Figure 1

Description

The present invention relates to a synthetic resin tube for radiant cooling and heating having an excellent radiant cooling and heating effect and moderate flexibility and independence, and a radiant cooling and heating panel using the same.

Conventionally, hot water floor heating panels that circulate hot water heated by kerosene boilers, gas water heaters, etc., or antifreeze liquids, and hot water panel generators are more comfortable for gentle heating compared to air conditioners that use the heat radiation effect. In addition to housing complexes and single-family houses, the introduction to spaces that require mild air conditioning, such as hospital rooms, elderly facilities, and children's facilities, is being actively promoted.

However, in order to enjoy the comfort of the heat radiation effect of these hot water heaters even in the summer, when cold water is circulated through the floor heating panel, the cold air stays in the lower part of the room and the expected effect is obtained. However, it has not been done in practice, because there is a risk that the moist air will be cooled and dewed on the panels, which will rot the building joists and damage the foundation.
For such problems, a panel for radiant cooling and heating that absorbs radiant heat from the human body and circulates cold water by circulating cold water instead of placing the panel on the floor surface and circulates cold water. It has attracted attention in recent years.

As piping used for such a panel for radiant cooling and heating, for example, Patent Document 1 discloses the use of a crosslinked polyethylene pipe, and Patent Document 2 uses a pipe made of a synthetic resin. It is disclosed. However, the piping used for these radiant cooling and heating panels has a thermal conductivity that is much lower than that of metal pipes and the thermal emissivity is not so high, so considering the indoor heat transfer and heat exchange efficiency, It was hard to say.
In addition, examples of the form of these pipes include those with plates attached as radiation panels, and those embedded in concrete slabs, but pipes made of synthetic resin etc. are constructed because they are flexible. Sometimes it is necessary to temporarily fix the concrete when it is buried, and the price of the system rises with a large scale. As a result, it has not spread explosively to the world as a substitute for air conditioning.

In general, it is known that the effect of heat radiation is proportional to the difference between the fourth power of the temperature of the heat source and the object, and when heating is performed using a panel for radiant cooling and heating, Since the temperature of the hot water circulated in the piping to be produced is about 60 ° C, if the outside air temperature is assumed to be about 5 ° C, the difference is Δ55 ° C. In this way, the temperature difference between the outside air and the hot water to be circulated should be large. Therefore, it was possible to perform sufficient heating even if the heat exchange capacity of the piping was somewhat inferior.
On the other hand, when cooling using a panel for radiant cooling and heating, the temperature of the chilled water circulated in the piping is about 15 ° C. in order not to deteriorate the efficiency (COP) on the heat source unit side, so the outside air temperature is assumed to be about 35 ° C. Then, the difference becomes very disadvantageous compared with the case of heating at Δ20 ° C.

Furthermore, there are three modes of heat transfer: conduction, convection, and radiation, but it does not involve forced air circulation (convection). That is, among the three modes of heat transfer, conduction and radiation transfer much heat. In radiant cooling and heating, it is important to efficiently transmit the temperature of the cooling medium in the pipe to the outside of the pipe by heat conduction and heat radiation. For example, when a general single-layer resin pipe is used as the piping of the radiant cooling and heating panel, the thermal emissivity ε is about 0.8, but the thermal conductivity is low and it cannot be used. On the other hand, for example, when a metal tube having high thermal conductivity is used, there is a problem that a seam that needs to be brazed is generated or corrosion peculiar to metal occurs. Considering the heat radiation from the surface layer, the oxidized (corroded) metal tube has a high thermal emissivity ε, but it cannot be used as a product because its appearance is impaired, while the appearance that can be used as a product has a glossy surface. In the metal pipe which has, the thermal emissivity ε is about 0.2 or less, which is quite inadequate as the piping of the radiant cooling and heating panel.

Further, if the piping for radiant cooling and heating is a metal tube, it is hard and self-supporting, but the curved portion needs to be prepared with an elbow or the like, and there is a problem that the number of connecting portions increases and the reliability is lacking. On the other hand, although the synthetic resin pipe is flexible, temporary fixing or the like is necessary when it is embedded in the concrete at the time of construction, and it takes time for construction and increases the construction cost. Therefore, the piping for radiant cooling and heating has been required to be compatible with flexibility and self-supporting property.
JP 2003-160985 A JP 2001-248850 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and an object thereof is to provide a synthetic resin tube for radiant cooling and heating having an excellent radiant cooling and heating effect and moderate flexibility and independence, and a radiant cooling and heating panel using the same. And

Further, the present invention is provided at least between the heat radiation layer provided on the outermost layer, the heat conduction layer provided on the inner surface side of the heat radiation layer, and the heat radiation layer and the heat conduction layer. A synthetic resin pipe for radiant cooling and heating having a metal layer, wherein the thermal radiation rate of the thermal radiation layer is 0.85 or more.
The present invention is described in detail below.

FIG. 1 is a cross-sectional view schematically showing an example of a synthetic resin pipe for radiant cooling and heating according to the present invention.
As shown in FIG. 1, the synthetic resin tube 20 for radiant cooling and heating according to the present invention includes at least a heat radiation layer 21 provided on the outermost layer, a heat conduction layer 23 provided on the inner surface side of the heat radiation layer 21, and A metal layer 22 is provided between the heat radiation layer 21 and the heat conduction layer 23.

In the synthetic resin tube 20 for radiant cooling and heating of the present invention, the heat radiation layer 21 is a tubular member provided in the outermost layer, and the heat of the cold medium circulating in the synthetic resin tube 20 for radiant cooling and heating of the present invention. Heat exchange is performed by radiating to the outside.

In the synthetic resin tube 20 for radiant cooling and heating of the present invention, the heat radiation layer 21 has a lower limit of the thermal emissivity ε of 0.85. If it is less than 0.85, the heat of the cooling medium circulating in the synthetic resin pipe 20 for radiant cooling and heating of the present invention is transmitted through the pipe thickness, and heat exchange by heat radiation from the outer surface of the pipe becomes insufficient. A preferred lower limit is 0.9. In the synthetic resin tube for radiant cooling and heating according to the present invention, the “thermal emissivity ε of the heat radiation layer” means that a sample is prepared using a resin material constituting the heat radiation layer, and the sample is used for JIS. It is a value measured by a method based on A 1423 “Easy Emissivity Measurement Method Using Infrared Radiation Thermometer”.

The resin material constituting the heat radiation layer 21 is not particularly limited, and examples thereof include heat-resistant polyethylene, crosslinked polyethylene, polypropylene, polybutene, polyphenylene sulfide (PPS), polyethylene terephthalate, and vinyl chloride. Of these, heat-resistant polyethylene and crosslinked polyethylene having relatively good thermal conductivity and thermal emissivity are preferably used.
Note that the resin material constituting the heat radiation layer 21 described above has a heat emissivity ε of about 0.83 or less, so that the heat exchange by sufficient heat radiation cannot be performed as it is. Therefore, when the resin material which comprises the thermal radiation layer 21 is what was mentioned above, it is necessary to make thermal emissivity (epsilon) into the said range by mixing the filler whose emissivity is higher than a resin material.

The filler mixed in the above-described resin material constituting the heat radiation layer 21 is not particularly limited, and examples thereof include silicon oxide, titanium oxide, manganese oxide, silicon sodium, silicon carbide, carbon black, and natural serpentine. It is done.

The shape of the substance mixed in the above-described resin material constituting the heat radiation layer 21 is not particularly limited, and may be any shape such as a granular shape or a needle shape. It is preferable to increase the number of added fillers having a higher emissivity than the resin material because it is easy to emit high heat.

The amount of the filler mixed in the above-described resin material constituting the heat radiation layer 21 is appropriately determined depending on the surface condition, specific gravity, etc. of the filler to be mixed, but the preferable lower limit in the heat radiation layer 21 is 3 weights. %, And a preferred upper limit is 33% by weight. If it is less than 3% by weight, the thermal emissivity of the heat radiation layer 12 may not satisfy the above range. If it exceeds 33% by weight, the fluidity of the mixture deteriorates and the back pressure at the time of molding becomes high. In some cases, it may become difficult to pulsate during molding, or the resin and the mixture may not be sufficiently impregnated, resulting in poor appearance. A more preferred lower limit is 7% by weight, and a more preferred upper limit is 20% by weight.

The heat radiation layer 21 preferably has a high thermal conductivity. Specifically, a preferable lower limit of the thermal conductivity of the heat radiation layer 21 is 0.80 W / m · K. If it is less than 0.80 W / m · K, the amount of heat passing through the heat radiation layer may be insufficient, and the temperature of the radiating surface layer may decrease.
In the synthetic resin pipe for radiant cooling and heating according to the present invention, the “thermal conductivity of the thermal radiation layer” means that a sample is prepared using a resin material constituting the thermal radiation layer, and ASTM C177 is used with the sample. It is a value measured in compliance.

Here, when the resin material such as heat-resistant polyethylene described above is used as a material constituting the heat radiation layer 21, these resin materials usually have a thermal conductivity of about 0.05 to 0.53 W / m · K. It is. Therefore, a filler such as a metal, an inorganic material and / or carbon which is a filler having a higher emissivity than that of the resin material is further added to the resin material constituting the heat radiation layer 21, and the lower limit of the thermal conductivity thereof. Is preferably 0.80 W / m · K.
Examples of the filler include iron, tin, zinc, gold, silver, copper, chromium, titanium, magnesium, alumina, silicon nitride, boron nitride, and oxides thereof. Of these, magnesium oxide and fibrous carbon are preferable. Magnesium oxide and fibrous carbon not only increase the thermal conductivity of the heat radiation layer 21 but also contribute greatly to the improvement of the heat emissivity compared to other fillers.

The amount of the filler added depends on the type of filler used, the surface condition and specific gravity of the filler, etc., but the preferred lower limit of the total amount of filler used is 1% by weight, and the preferred upper limit is 33% by weight. . By adding the filler in this range, the lower limit of the thermal conductivity of the heat radiation layer 21 can be set to 0.80 W / m · K.

When magnesium oxide is added as the filler, the preferred lower limit of the average particle size of the magnesium oxide is 0.5 μm, the preferred upper limit is 10 μm, the preferred lower limit of the addition amount is 1% by weight, and the preferred upper limit is 33. % By weight. By adding such magnesium oxide to the above-described material constituting the heat radiation layer 21, the heat radiation rate of the heat radiation layer 21 exceeds 0.9, and the heat conductivity is 0.80 W / m.・ K or more.

Moreover, when adding fibrous carbon as said filler, the minimum with the preferable addition amount of the said filler is 1 weight%, and a preferable upper limit is 33 weight%. By adding fibrous carbon in this range, the thermal conductivity of the heat radiation layer 21 becomes very high.

The fibrous carbon may be one in which fibers are actually formed, or may have a structure structure by forming primary particles in which crystallites are aggregated and fusing them. Specific examples include carbon black, carbon graphite, carbon fiber, and carbon nanotube.

When adding magnesium oxide as the filler, it is preferable to add fibrous carbon in a range where the preferred lower limit is 1% by weight and the preferred upper limit is 33% by weight. By adding fibrous carbon in the above range, the thermal conductivity of the heat radiation layer 21 becomes very high. This is because by adding particulate magnesium oxide and fibrous carbon to the material constituting the heat radiation layer 21, the heat radiation layer 21 has a so-called sea-island structure in which granular magnesium oxide alone floats in the resin. In other words, it is considered that magnesium oxide is connected via fibrous carbon, so that a heat path is created and the thermal conductivity of the heat radiation layer 21 is dramatically improved.

When the magnesium oxide and the fibrous carbon are added to the resin material constituting the heat radiation layer 21, the preferable lower limit of the total amount of both substances is 2% by weight, and the preferable upper limit is 66% by weight. In view of the property, flexibility, and thermal performance improvement, the more preferable lower limit of the addition amount of both substances is 5% by weight, the more preferable upper limit is 40% by weight, the still more preferable lower limit is 10% by weight, and the more preferable upper limit is 33% by weight. %.

In addition, the thermal radiation layer 21 uses a viscosity adjusting agent, a surfactant, etc., together with a substance to be mixed to make the thermal emissivity ε within the above range, a filler added to make the thermal conductivity within the above range. Thus, the number of added parts may be adjusted.

Although it does not specifically limit as thickness of the heat radiation layer 21, A preferable minimum is 0.01 mm and a preferable upper limit is 5 mm. If it is less than 0.01 mm, it may be damaged by the deflection of the synthetic resin tube 20 for radiant cooling and heating of the present invention. If it exceeds 5 mm, the heat conduction of the synthetic resin tube 20 for radiant cooling and heating of the present invention as a whole is poor. Depending on the material matrix constituting the heat radiation layer 21, the rigidity may be increased and the flexibility may be lost. A more preferable lower limit is 0.2 mm, and a more preferable upper limit is 2.0 mm.

The heat conduction layer 23 is a tubular member provided on the inner surface side of the heat radiation layer 21 described above, and conducts the heat of the cold medium circulating in the synthetic resin tube 20 for radiation cooling and heating according to the present invention, thereby heat radiation. It conveys to the layer 21.

In the synthetic resin tube 20 for radiant cooling and heating of the present invention, the heat conductive layer 23 has a high heat conductivity. Specifically, the lower limit of the thermal conductivity is preferably 0.8 W / m · K. If it is less than 0.8 W / m · K, the heat of the cold medium may not be sufficiently conducted to the heat radiation layer 21. In the synthetic resin pipe for radiant cooling and heating according to the present invention, the “thermal conductivity of the heat conduction layer” means that a sample is prepared using the resin material constituting the heat conduction layer, and ASTM C177 is used using the sample. It is a value measured in compliance.

The resin material constituting the heat conductive layer 23 is not particularly limited, and examples thereof include polyolefin resins such as heat-resistant polyethylene, crosslinked polyethylene, polypropylene, and polybutene, polyphenylene sulfide (PPS), polyethylene terephthalate (PET), vinyl chloride, and the like. Are preferably used. Of these, polyolefin resins such as heat-resistant polyethylene and crosslinked polyethylene having relatively good thermal conductivity and thermal emissivity are preferably used.

Further, since the resin material constituting the heat conductive layer 23 has a maximum temperature of about 90 ° C. of the cold medium circulating in the heat conductive layer 23, the polyolefin resin has a lower limit of the bicaret softening temperature of 115 ° C. Preferably, the lower limit is 120 ° C., copolymerized with an α-olefin such as propylene, butene, hexene, octene, 4-methylpentene to introduce short chain branches, and the lower limit of the number average molecular weight is 15000, the upper limit Is preferably a polyethylene resin composition having a weight average molecular weight of 50,000, a lower limit of 80,000, and an upper limit of 150,000. When the resin material which comprises the heat conductive layer 23 is such a polyethylene-type resin composition, stability at high temperature and durability can further be improved, suppressing material cost.

In addition, since the heat conductivity of the resin material which comprises the heat conductive layer 23 mentioned above is about 0.05-0.53 W / m * K, it does not reach to a sufficiently high heat conduction in this state. Therefore, when the resin material which comprises the heat conductive layer 23 is what was mentioned above, it is necessary to raise a heat conductivity by mixing the filler whose heat conductivity is higher than a resin material.

Examples of the substance to be mixed in order to increase the thermal conductivity of the resin material constituting the heat conductive layer 23 include metals, inorganic materials, and carbons. Specific examples include iron, tin, zinc, gold, silver, copper, chromium, titanium, magnesium, alumina, silicon nitride, carbon graphite, and the like.

Further, the heat conductive layer 23 may be deteriorated by the generation of radicals due to the action of light, heat, transition metal ions, etc., which enter the chain cycle of auto-oxidation and the oxidation reaction continues. Particularly, in the synthetic resin pipe 20 for radiant cooling and heating according to the present invention, oxidation due to heat occurs, that is, deterioration occurs. Therefore, in order to prevent this, the heat conductive layer 23 preferably contains an antioxidant.

The antioxidant is not particularly limited. For example, phenolic antioxidants such as 3,5-di-t-butyl-4-hydroxybenzylbenzene and 4-methyl-6-t-butylphenol; triphenyl phosphite And phosphorus antioxidants such as trinonylphenyl phosphite; ionic antioxidants such as dilauryl thiodipropionate and distearyl thiodipropionate.

These antioxidants may be used alone or in combination of two or more, but the combination of the above-mentioned phenolic antioxidant and phosphorus antioxidant, or the phenolic antioxidant A combination with a sulfur-based antioxidant is particularly suitable because it further exhibits an antioxidant action and a yellowing prevention effect due to the formation of quinones.

The addition amount of the antioxidant is not particularly limited, but a preferable lower limit is 0.001 part by weight and a preferable upper limit is 5 parts by weight with respect to 100 parts by weight of the resin material constituting the heat conductive layer 23 described above. If it is less than 0.001 part by weight, the antioxidant effect of the heat conduction layer 23 can hardly be expressed, and if it exceeds 5 parts by weight, the original physical properties of the resin material constituting the heat conduction layer 23 are deteriorated, or to the built-in water. Water quality may deteriorate due to elution.

The resin material forming the heat conductive layer 23 may be further used in combination with various viscosity modifiers and surfactants to improve moldability. Moreover, you may mix | blend an additional component, for example, an antistatic agent, a flame retardant, a dew condensation prevention agent, the additional resin component of these masterbatches, etc.

Although it does not specifically limit as thickness of the heat conductive layer 23, A preferable minimum is 0.3 mm and a preferable upper limit is 5 mm. When the thickness is less than 0.3 mm, deterioration due to the movement of the cooling / heating medium, micro cracks occur when the synthetic resin tube 20 for radiant cooling / heating of the present invention is bent, the cooling / heating medium reaches the metal layer 22 described later, and the metal Layer 22 may be corroded. If it exceeds 5 mm, the heat conduction of the cooling / heating medium may be deteriorated, or the rigidity of the synthetic resin tube 20 for radiant cooling / heating of the present invention may be increased and the flexibility may be lost.

The metal layer 22 is provided between the heat radiation layer 21 and the heat conduction layer 23 described above. The metal layer 22 conducts heat conducted from the heat conduction layer 23 to the heat radiation layer 21 and is used for the radiation cooling and heating of the present invention. The appropriate rigidity and flexibility of the synthetic resin tube 20 are ensured.

The metal material constituting the metal layer 22 is not particularly limited as long as it has good thermal conductivity. For example, iron, brass, copper, stainless steel, aluminum, titanium, silver alloy, etc. are preferably used. . Among these, copper or aluminum is preferable from the viewpoint of cost and workability, and aluminum is most preferable in view of the fact that the resin material constituting the heat radiation layer 21 and the heat conduction layer 23 is corroded by copper damage. It is.

The metal material constituting the metal layer 22 has a very good thermal conductivity of 20 to 420 W / m · K, which is several tens of times that of a general resin composition, and this metal layer also contributes to strength. Therefore, as the synthetic resin tube 20 for radiant cooling and heating of the present invention, the heat radiation layer 21 and the heat conduction layer 23 can be relatively thin, and as a result, the synthetic resin tube 20 for radiant cooling and heating of the present invention. Thermal characteristics are improved.

Although it does not specifically limit as thickness of the metal layer 22, A preferable minimum is 0.1 mm and a preferable upper limit is 2.0 mm. If it is less than 0.1 mm, the synthetic resin tube 20 for radiant cooling and heating according to the present invention is likely to be bent and the pressure resistance may be lowered. If it exceeds 2.0 mm, the material cost of the metal layer 22 is increased. The rigidity becomes high and the flexibility of the synthetic resin pipe 20 for radiant cooling and heating of the present invention is sacrificed.

Further, the metal layer 22 is subjected to a general blasting treatment or a degreasing treatment with an alkali or the like so as not to adversely affect the adhesiveness between the inner surface side heat conduction layer 23 and the outer side heat radiation layer 21 as necessary. Acid treatment with hydrochloric acid, nitric acid, sulfuric acid or the like may be performed.

In the synthetic resin pipe for radiant cooling and heating according to the present invention, a conventionally known adhesive or the like may be applied between the heat conductive layer, the metal layer, and the heat radiating layer described above in order to improve adhesion. When an adhesive is applied between the heat conductive layer, the metal layer, and the heat radiation layer, the adhesive is preferably applied so that the thickness is 0.2 mm or less. If it is thicker than 0.2 mm, heat conduction between the layers may be hindered, and the heat exchange efficiency of the synthetic resin pipe for radiant cooling and heating of the present invention may be reduced.

Although it does not specifically limit as an outer diameter of the synthetic resin pipe | tube of this invention, A preferable minimum is 5 mm and a preferable upper limit is 25 mm. If it is less than 5 mm, the synthetic resin pipe for radiant cooling and heating according to the present invention may be blocked by foreign matter. If it exceeds 25 mm, the synthetic resin for radiant cooling and heating according to the present invention from the viewpoints of handling during construction, weight of retained water, etc. It is difficult to install a radiant cooling / heating panel using a tube indoors, and there is a risk of damage.

Moreover, since the synthetic resin pipe for radiant cooling and heating according to the present invention has a heat radiation layer in the outermost layer, it is preferable to use it without exposing fins or fittings, but even if fins or fittings are used. Good.

The cooling / heating medium circulating in the synthetic resin pipe for radiant cooling / heating of the present invention having such a structure is not particularly limited, and examples thereof include conventionally known ones used in radiant cooling / heating apparatuses such as cold / hot water and antifreeze liquid.

The method for producing the synthetic resin pipe for radiant cooling and heating according to the present invention is not particularly limited. For example, after forming the portion of the heat conductive layer 23 shown in FIG. 1 with a publicly known extruder, a metal is formed on the extension line in the traveling direction. Examples of the method include a method in which the layer 22 is wound from the outside, and the heat radiation layer 21 is coated on the extended line from the outside with a publicly known extruder. Further, for example, the metal layer 22 may be a method in which a continuous metal plate having a width substantially equal to the circumference of the pipe is bent inwardly on the line, covered with the heat conductive layer 23, and end faces are welded to form a pipe shape. . Further, the adhesive layers may be covered by an extruder or spraying between the layers of the heat radiation layer 21, the metal layer 22, and the heat conduction layer 23.

Since the synthetic resin tube for radiant cooling and heating according to the present invention has a heat conductive layer with excellent thermal conductivity on the side where the cold medium circulates, the heat of the cold medium is suitably applied to the metal layer and the heat radiant layer provided on the outside thereof. Can be conducted. Moreover, since it has a heat radiation layer with high heat radiation performance in the outermost layer, it is excellent in heat absorbing / dissipating performance, and is very excellent in the panel use for radiation cooling and heating. In addition, since the metal layer is provided between the heat radiation layer and the heat conductive layer, the metal layer has an appropriate rigidity and satisfies both flexibility and self-supporting property.

The synthetic resin pipe for radiant cooling and heating according to the present invention is attached to a header as shown in FIG. 2 (a) or (b) and formed into a panel to constitute a radiant cooling / heating panel. 2A and 2B are perspective views schematically showing an example of a header for attaching the synthetic resin pipe for radiant cooling and heating according to the present invention.

The header 30 shown in FIG. 2A is provided with a tubular flow channel 31 for circulating a cold medium inside a rectangular main body and a plurality of openings 32 communicating with the flow channel 31. On the other hand, the header 35 shown in FIG. 2 (b) has two tubular channels 36a and 36b through which the cooling medium flows in the rectangular main body, and a plurality of openings 37a communicating with the channels 36a and 36b. , 37b.

When attaching the synthetic resin pipes for radiant cooling and heating of the present invention to such headers 30 and headers 35, a plurality of synthetic resin pipes for radiant cooling and heating of the present invention are arranged in parallel according to the number of openings provided in each header, The end of the synthetic resin pipe for radiant cooling and heating according to the present invention is attached to the opening of the header.
A plurality of such synthetic resin tubes for radiant cooling and heating according to the present invention arranged in parallel, and a header provided with a tubular flow channel through which a cooling medium flows and a plurality of openings leading to the flow channel are provided. A radiant cooling / heating panel in which the end of the synthetic resin pipe for radiant cooling / heating is attached to the opening of the header to form a panel is also one aspect of the present invention.

FIG. 3 is an exploded perspective view schematically showing how the synthetic resin pipe for radiant cooling and heating of the present invention is attached to the header 30 shown in FIG.
As shown in FIG. 3, when the synthetic resin pipe for radiant cooling / heating of the present invention is attached to a header 30 to form a panel, the synthetic resin pipe for radiant cooling / heating of the present invention is disposed between a pair of headers.
That is, the synthetic resin for radiant cooling and heating according to the present invention in which a pair of headers 30 are arranged so that the surfaces provided with the openings 32 face each other, and a plurality of the headers 30 are arranged in parallel according to the number of the openings 32 and the number of the openings 32. The end of the tube 40 is attached via a connection fitting 41. In addition, as shown in FIG. 3, it is preferable that the connection fitting 41 attached to one end of the synthetic resin pipe 40 for radiant cooling and heating of the present invention is further attached to the opening 32 of the header 30 via the flow rate adjusting valve 42. .

As shown in FIG. 3, when using a radiant cooling / heating panel in which the synthetic resin pipe 40 for radiant cooling / heating of the present invention is attached to the header 30, the cooling / warming medium is opened from the flow path 31 of one header 30 to each opening 32. To the inside of the synthetic resin pipe 40 for radiant cooling and heating according to the present invention, and circulates from the opening 32 of the other header 30 to the flow path 31.

FIG. 4 is an exploded perspective view schematically showing how the synthetic resin pipe for radiant cooling and heating according to the present invention is attached to the header 35 shown in FIG.
As shown in FIG. 4, when the synthetic resin pipe for radiant cooling and heating according to the present invention is attached to the header 35 to form a panel, one end of the bent synthetic resin pipe 50 for radiant cooling and heating according to the present invention becomes one flow path 36a. It attaches to the opening 37a which leads, and is attached to the other flow path 37b of the synthetic resin pipe | tube 50 for radiation cooling / heating of this invention.
That is, a plurality of synthetic resin tubes 50 for radiant cooling and heating according to the present invention bent near the center on the surface of the header 35 provided with the openings 37a and 37b are arranged in parallel according to the number of the openings 37a and 37b. The opening 37a and the opening 37b of 35 and the end of the synthetic resin pipe 50 for radiant cooling and heating according to the present invention are attached via a connection fitting 41. As shown in FIG. 4, it is preferable that the connection fitting 41 attached to one end of the synthetic resin pipe 50 for radiant cooling and heating according to the present invention is further attached to the opening 36 a of the header 35 via the flow rate adjusting valve 42. .

As shown in FIG. 4, when using a radiation cooling / heating panel in which the synthetic resin pipe 50 for radiation cooling / heating of the present invention is attached to the header 35, the cooling / heating medium leads from the flow path 36 a to each opening 37 a, for example, It is supplied to the inside of the synthetic resin pipe 50 for radiant cooling and heating according to the present invention and circulates from the opening 37b to the flow path 36b.

Since the synthetic resin tube for radiant cooling and heating according to the present invention has a heat conductive layer with excellent thermal conductivity on the side where the cold medium circulates, the heat of the cold medium is suitably applied to the metal layer and the heat radiant layer provided on the outside thereof. Can be conducted. Moreover, since it has a heat radiation layer with high heat radiation performance in the outermost layer, it is excellent in heat absorbing / dissipating performance, and is very excellent in the panel use for radiation cooling and heating. In addition, since the metal layer is provided between the heat radiation layer and the heat conductive layer, the metal layer has an appropriate rigidity and satisfies both flexibility and self-supporting property.

Therefore, according to the present invention, it is possible to provide a synthetic resin tube for radiant cooling and heating having an excellent radiant cooling and heating effect and moderate flexibility and independence, and a radiant cooling and heating panel using the same.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Example 1)
(1) Production of heat conductive layer and metal layer Using high density polyethylene (Maruzen Petrochemical) P9820 as matrix resin, 10% by weight of copper powder having an average particle size of 43 μm and 10% by weight of carbon fiber having a diameter of 13 μm and a length of 300 μm After being kneaded and extruded into a master batch, it was formed into a tube shape having an inner diameter of 13 mm and a thickness of 1.2 mm by an extruder, and an aluminum plate having a thickness of 0.45 mm was formed thereon as a metal layer. Have the same width, bend inward in the width direction, and coat and finish the tube and weld the end face to form a metal layer made of aluminum with a thickness of 0.45 mm on the outer surface of the heat conduction layer did. In addition, using a resin material constituting the heat conductive layer, a sample for measuring thermal conductivity of 50 mm square and a thickness of 8 mm is separately prepared, and the sample based on the thermal conductivity measurement is used in accordance with ASTM C177. It was 0.98 W / m · K when the thermal conductivity was measured with a probe type thermal conductivity meter “QTM-3” manufactured by Kyoto Electronics Industry Co., Ltd.

(2) Formation of heat radiation layer High density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, and 10 wt% of 50 μm silicon oxide and 5 wt% of carbon black having a diameter of 10 μm are kneaded and extruded to form a master batch. After that, on the metal layer formed by the extrusion molding method, coating extrusion was performed in the same line to form a heat radiation layer having a thickness of 0.3 mm, and a synthetic resin tube for radiation cooling and heating was manufactured. In addition, using a resin material constituting the heat radiation layer, a sample for thermal emissivity measurement of 50 mm square and a thickness of 5 mm was separately prepared, and the thermal emissivity ε of the heat emissivity measurement sample was determined according to JIS A 1423 “ It was 0.94 when it measured by the method based on "the simple measuring method of the emissivity by an infrared radiation thermometer".

(3) Production of Radiant Air Conditioning / Heating Panel The obtained synthetic resin tube for radiant air conditioning was cut to a length of 2000 mm, and 15 radiant air conditioning panels were arranged in parallel at 75 mm pitch in the form as shown in FIG. .

(Example 2)
(1) Production of heat conduction layer and metal layer High density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, carbon fiber having a diameter of 15 μm, an aspect ratio of 5% by weight of iron oxide, a diameter of 13 μm and a length of 200 μm. Was formed into a tube shape having an inner diameter of 13 mm and a thickness of 1.2 mm using an extruder, and a copper plate having a thickness of 0.2 mm was used to make a thickness of 1 as in Example 1. A 2 mm heat conductive layer and a 0.2 mm thick copper metal layer were formed. In addition, it was 1.02 W / m * K when the heat conductivity was measured like Example 1 using the resin material which comprises a heat conductive layer.

(2) Formation of heat radiation layer High-density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, 10 wt% of titanium oxide having an average particle size of 50 μm is kneaded and extruded into a master batch, and then extrusion molding method A synthetic radiation pipe for radiation cooling and heating was manufactured by forming a heat radiation layer having a thickness of 0.3 mm on the metal layer formed by the above process. The thermal emissivity ε was measured in the same manner as in Example 1 using the resin material constituting the thermal radiation layer, and was 0.92.

(3) Production of Radiant Air Conditioning / Heating Panel The obtained synthetic resin tube for radiant air conditioning was cut to a length of 2000 mm, and a radiation air conditioning panel having 15 parallel arrangements at a 75 mm pitch in the form shown in FIG. 3 was produced. .

(Example 3)
In the same manner as in Example 2, a heat conductive layer and a metal layer were formed.
Thereafter, high density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, and 33% by weight of magnesium oxide powder having an average particle size of 1.3 μm is kneaded and extruded to form a master batch, which is then formed by an extrusion molding method. A heat radiation layer having a thickness of 0.3 mm was formed on the above metal layer by the same line to produce a synthetic resin tube for radiation cooling and heating. Note that the thermal emissivity ε was measured in the same manner as in Example 1 by using the resin material constituting the thermal radiation layer, and it was 0.97.
The obtained synthetic resin pipe for radiant cooling and heating was cut to a length of 2000 mm, and a radiant cooling and heating panel was arranged in parallel with 75 mm pitch in the form as shown in FIG.

(Comparative Example 1)
A synthetic resin tube for radiant cooling and heating was manufactured in the same manner as in Example 1 except that high-density polyethylene (Maruzen Petrochemical, P9820) was used as the material for the heat conduction layer and the heat radiation layer. In addition, when the thermal conductivity and thermal emissivity ε were measured in the same manner as in Example 1 using the resin material constituting the thermal conductive layer and the thermal radiation layer, the thermal conductivity was 0.32 W / m · K. The thermal emissivity ε was 0.80.
Then, the panel for radiation cooling / heating was produced like Example 1. FIG.

(Comparative Example 2)
A general-purpose copper tube having an inner diameter of 13 mm and a thickness of 0.8 mm was used as a synthetic resin tube for radiant cooling and heating. When the thermal conductivity and thermal emissivity ε were measured in the same manner as in Example 1 using the same material as the general-purpose copper tube, the thermal conductivity was 269 W / mK and the thermal emissivity ε was 0.10. Met.
Then, the panel for radiation cooling / heating was produced like Example 1. FIG.

(Comparative Example 3)
A general-purpose cross-linked polyethylene pipe having an inner diameter of 13 mm and a thickness of 1.0 mm was used as a synthetic resin pipe for radiant cooling and heating. When the thermal conductivity and thermal emissivity ε were measured in the same manner as in Example 1 using the same material as the general-purpose crosslinked polyethylene pipe, the thermal conductivity was 0.31 W / mK, and the thermal emissivity ε was It was 0.79.
Then, the panel for radiation cooling / heating was produced like Example 1. FIG.

(Comparative Example 4)
A synthetic resin tube for radiant cooling and heating in the same manner as in Example 2 except that a metal layer made of copper having a thickness of 0.2 mm was not formed and only two layers of a heat conductive layer and a heat radiation layer were used, and A panel for radiant cooling and heating was produced.

(Evaluation)
The following evaluation was performed about the panel for radiation cooling / heating manufactured in Examples 1-3 and Comparative Examples 1-4. The results are shown in Table 1.

A cold / hot water chiller was used, and the temperature of the going hot water was 40 ° C. The flow rate was set to 1.0 L / min. The warm water return temperature was achieved by the heat radiation performance of the produced radiant cooling and heating panel.

(Evaluation body)
We used a 6-tatami room of a simulated house that was made in accordance with the Q and C values of the next-generation energy-saving standards (region III). The indoor space was always maintained at 20 ° C. (outside air temperature 5 ° C.) even when heat was released from the panel for radiant cooling and heating with a cold / hot water supply heat pump (AEY4030SVXC) manufactured by Chofu Seisakusho.

(Radiation amount)
After 3 hours to 4 hours after operation, the amount of radiant heat of the panel for radiant cooling and heating per hour was calculated from the difference between the going hot water temperature and the returning hot water temperature and the flow rate, and the amount of heat released into the room. This was divided by the panel unit area to obtain the amount of heat released per unit area.

(Retention)
The hot water was turned and the shape was maintained as “◯”, and the product that could not withstand the softening due to temperature and its own weight and could not keep the shape was evaluated as “X”.

(Bending workability)
Bending was performed using a 75-diameter bending mold for general-purpose copper pipes. Those that could be bent without any problem were rated as “◯”, those that were bent, those that had returned due to flexibility, and those that had problems such as corrosion during continuous operation for one month were marked as “X”.

(Comprehensive judgment)
In view of all the evaluations, those that can withstand use as radiant cooling and heating panels are marked with “◯”, and those that have a problem and cannot withstand use are marked with “x”.

Example 4
(1) Production of heat conduction layer and metal layer As a polyolefin layer, Vicat softening temperature of 123 ° C., octene is copolymerized as α-olefin to introduce short chain branching, number average molecular weight about 30,000 and weight average molecular weight about A polyethylene resin composition having 120,000 was used, 0.1 parts by weight of phenol-based 4-methyl-6-tert-butylphenolphenol as an antioxidant, and trinonylphenyl phosphite 0 as a phosphorus-based antioxidant .05 parts by weight is used and a resin composition with reduced deterioration is prepared, and this is formed into a tube shape having an inner diameter of 13 mm and a thickness of 1.0 mm by an extruder, and a SUS having a thickness of 0.28 mm as a metal layer thereon. The plate has the same width as the outer periphery of the extruded tube, and is bent to the inner side in the width direction. Thermally conductive layer to form a metal layer made of SUS having a thickness of 0.28mm on the outer surface of the thermally conductive layer. It should be noted that the resin material constituting the heat conduction layer, when kneaded with a high heat conductive filler for the purpose of long-term hot water durability, the interface between the resin and the high heat conductive filler is likely to be deteriorated by water, so high heat dissipation due to the filler. There was no conversion. In addition, a sample for thermal conductivity measurement of 50 mm square and a thickness of 5 mm was separately prepared, and using the sample for thermal conductivity measurement, a method based on ASTM C177, manufactured by Kyoto Electronics Industry Co., Ltd., probe type thermal conductivity It was 0.37 W / m * K when the heat conductivity was measured with the total "QTM-3".

(2) Formation of heat radiation layer High density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, and 10% by weight of silicon oxide having an average particle size of 50 μm and 35% by weight of boron nitride having an average particle size of 8 μm are kneaded. After extruding into a master batch, the metal layer formed by extrusion molding was coated and extruded on the same line to form a 0.3 mm thick heat radiation layer, and a synthetic resin tube for radiation cooling and heating was produced. In addition, by using a resin material constituting the heat radiation layer, a sample for measuring thermal conductivity of 50 mm square and a thickness of 5 mm is separately prepared, and the sample for measuring thermal conductivity is used in a method based on ASTM C177. The thermal conductivity was measured with a probe type thermal conductivity meter “QTM-3” manufactured by Kyoto Electronics Industry Co., Ltd. and found to be 0.82 W / m · K. In addition, using a resin material constituting the heat radiation layer, a sample for thermal emissivity measurement of 50 mm square and a thickness of 5 mm is separately prepared, and the heat emissivity ε of the heat emissivity measurement sample is defined as JIS A 1423 “ It was 0.86 when it measured by the method based on the "simplified measuring method of the emissivity by an infrared radiation thermometer".

(3) Production of Radiant Air Conditioning / Heating Panel The obtained synthetic resin tube for radiant air conditioning was cut to a length of 2000 mm, and 15 radiant air conditioning panels were arranged in parallel at 75 mm pitch in the form as shown in FIG. .

(Example 5)
A heat conductive layer and a metal layer were formed on the outer surface of the heat conductive layer in the same manner as in Example 4 except that an aluminum plate having a thickness of 0.28 mm was used instead of the SUS plate.
Next, high density polyethylene (Maruzen Petrochemical, P9820) is used as a matrix resin, and 40 wt% of granular carbon black with an average particle size of 10 μm is kneaded and extruded into a master batch, and then formed by extrusion molding. The layer was coated and extruded on the same line to form a 0.3 mm thick heat radiation layer, and a synthetic resin tube for radiation cooling and heating was produced. When the thermal conductivity and thermal emissivity were measured in the same manner as in Example 4 using the material constituting the thermal radiation layer, the thermal conductivity was 0.97 W / m · K, and the thermal emissivity ε Was 0.86.
The obtained synthetic resin tube for radiant cooling and heating was cut into a length of 2000 mm, and a radiant cooling and heating panel was arranged in parallel with 75 mm pitch in the form shown in FIG.

(Example 6)
A heat conduction layer and a metal layer were produced in the same manner as in Example 5.
Next, high-density polyethylene (Maruzen Petrochemical, P9820) is used as the matrix resin, and 10% by weight of iron oxide having a diameter of 15 μm and an aspect ratio of 5 and 15% by weight of carbon fiber having an average diameter of 13 μm and a length of 50 μm are kneaded and extruded. After forming into a master batch, a metal layer formed by extrusion molding was coated and extruded in the same line to form a heat radiation layer having a thickness of 0.3 mm to produce a synthetic resin tube for radiation cooling and heating. When the thermal conductivity and thermal emissivity were measured in the same manner as in Example 4 using the resin material constituting the thermal radiation layer, the thermal conductivity was 1.08 W / m · K, and the thermal emissivity was ε was 0.90.
The obtained synthetic resin tube for radiant cooling and heating was cut into a length of 2000 mm, and a radiant cooling and heating panel was arranged in parallel with 75 mm pitch in the form shown in FIG.

(Example 7)
A heat conduction layer and a metal layer were produced in the same manner as in Example 5.
Next, high-density polyethylene (Maruzen Petrochemical, P9820) is used as the matrix resin, 10% by weight of magnesium oxide having an average particle diameter of 2 μm, and 20% by weight of fibrous carbon black (Ketjen Black EC600JD) in which the particles are chained. After kneading and extruding into a master batch, the metal layer formed by extrusion molding is coated and extruded in the same line to form a heat radiation layer with a thickness of 0.3 mm. Manufactured. When the thermal conductivity and thermal emissivity were measured in the same manner as in Example 4 using the resin material constituting the thermal radiation layer, the thermal conductivity was 1.25 W / m · K. ε was 0.94.
The obtained synthetic resin tube for radiant cooling and heating was cut into a length of 2000 mm, and a radiant cooling and heating panel was arranged in parallel with 75 mm pitch in the form shown in FIG.

(Comparative Example 5)
A synthetic resin pipe for radiant cooling and heating was manufactured in the same manner as in Example 4 except that high-density polyethylene (Maruzen Petrochemical, P9820) was used as the material constituting the heat conduction layer and the heat radiation layer. In addition, when the thermal conductivity and the thermal emissivity were measured in the same manner as in Example 4 using the materials constituting the thermal conductive layer and the thermal radiation layer, the thermal conductivity was 0.32 W / m · K, The thermal emissivity ε was 0.80.
Thereafter, a radiation cooling / heating panel was produced in the same manner as in Example 4.

(Comparative Example 6)
A general-purpose copper tube having an inner diameter of 13 mm and a thickness of 0.8 mm was used as a synthetic resin tube for radiant cooling and heating. When the thermal conductivity and thermal emissivity ε were measured in the same manner as in Example 1 using the same material as the general-purpose copper tube, the thermal conductivity was 269 W / mK and the thermal emissivity ε was 0.10. Met.
Thereafter, a radiation cooling / heating panel was produced in the same manner as in Example 4.

(Comparative Example 7)
A general-purpose cross-linked polyethylene pipe having an inner diameter of 13 mm and a thickness of 1.0 mm was used as a synthetic resin pipe for radiant cooling and heating. In addition, when the thermal conductivity and thermal emissivity ε were measured in the same manner as in Example 1 using the same material as the general-purpose crosslinked polyethylene pipe, the thermal conductivity was 0.34 W / mK, and the thermal emissivity ε was It was 0.79.
Thereafter, a radiation cooling / heating panel was produced in the same manner as in Example 4.

(Evaluation)
The following evaluation was performed about the panel for radiation cooling / heating manufactured in Examples 4-7 and Comparative Examples 5-7. The results are shown in Table 2.

A cold / hot water chiller was used, and the temperature of the going hot water was 40 ° C. The flow rate was set to 1.0 L / min. The warm water return temperature was achieved by the heat radiation performance of the produced radiant cooling and heating panel.

(Evaluation body)
Use a 6-tatami room of a simulated house that is made in accordance with the Q and C values of the next-generation energy-saving standards (region III). The indoor space was always maintained at 20 ° C. (outside air temperature 5 ° C.) even when heat was released from the panel for radiant cooling and heating with a cold / hot water supply heat pump (AEY4030SVXC) manufactured by Chofu Seisakusho.

(Radiation amount)
Three hours after the operation, the amount of radiant heat of the radiant cooling / heating panel was measured, and the amount of heat released into the room was measured from the difference between the going hot water temperature and the returning hot water temperature and the flow rate. This was divided by the panel unit area to obtain the amount of heat released per unit area.

(Retention)
“○” indicates that the shape was maintained by turning warm water, and “×” indicates that the shape could not be maintained because it could not withstand the softening or dead weight due to temperature.

(Bending workability)
Bending was performed using a 75-diameter bending mold for general-purpose copper pipes. Those that could be bent without problems were marked with “◯”, those that were bent, and those that had returned with flexibility were marked with “X”.

(Short-term corrosive)
After bending, the tube was immersed in 80 ° C. hot water for 24 hours, and left at room temperature for 24 hours for 2 weeks. Then, the pipe of the bent portion was divided vertically, and corrosion such as rust was visually confirmed. The case where rust and the like could not be confirmed was indicated by “◯”, and the case where the inner layer resin was cracked and the rust of the metal layer was confirmed was indicated by “X”.

(Long-term corrosive)
After performing the same evaluation as the short-term corrosivity for 3 months, the bent portion of the pipe was divided vertically, and corrosion such as rust was visually confirmed. The case where rust and the like could not be confirmed was indicated by “◯”, and the case where the inner layer resin was cracked and the rust of the metal layer was confirmed was indicated by “X”.

(Comprehensive judgment)
In view of all the evaluations, those that can withstand use as radiant cooling and heating panels are marked with “◯”, and those that have a problem and cannot withstand use are marked with “x”.

ADVANTAGE OF THE INVENTION According to this invention, the synthetic resin pipe | tube for radiant air conditioning which has moderate flexibility and self-supporting property with the outstanding radiant air conditioning effect, and the panel for radiant air conditioning which uses this can be provided.

It is sectional drawing which shows typically an example of the synthetic resin pipe | tube for radiation cooling / heating of this invention. (A) is a perspective view which shows typically an example of the header used for the panel for radiation heating / cooling of this invention, (b) is typically another example of the header used for the panel for radiation cooling / heating of this invention. It is a perspective view shown. It is a disassembled perspective view which shows typically a mode that the synthetic resin pipe | tube for radiation cooling / heating of this invention is attached to the header 30 shown to Fig.2 (a). It is a disassembled perspective view which shows typically a mode that the synthetic resin pipe | tube for radiation cooling / heating of this invention is attached to the header 35 shown in FIG.2 (b).

Explanation of symbols

20, 40, 50 Synthetic resin tube for radiant cooling and heating 21 Heat radiation layer 22 Metal layer 23 Heat conduction layer 30 Header 31 Flow path 32 Opening 35 Header 36a, 36b Flow path 37a, 37b Opening 41 Connection fitting 42 Flow rate adjusting valve

Claims (10)

Radiation having at least a heat radiation layer provided in the outermost layer, a heat conduction layer provided on the inner surface side of the heat radiation layer, and a metal layer provided between the heat radiation layer and the heat conduction layer A synthetic resin pipe for cooling and heating, wherein the heat radiation layer has a thermal emissivity of 0.85 or more. The synthetic resin pipe for radiant cooling and heating according to claim 1, wherein the heat radiation layer contains 1-33 wt% of magnesium oxide powder having an average particle diameter of 0.5 to 10 µm. The synthetic resin pipe for radiant cooling and heating according to claim 1 or 2, wherein the heat radiation layer contains 1-33% by weight of fibrous carbon. The synthetic resin pipe for radiant cooling and heating according to claim 1, 2, or 3, wherein the thermal conductivity of the thermal radiation layer is 0.8 W / m · K or more. 5. The synthetic resin pipe for radiant cooling and heating according to claim 1, wherein the thermal conductivity of the heat conductive layer is 0.8 W / m · K or more. The synthetic resin pipe for radiant cooling and heating according to claim 1, wherein the heat conductive layer contains an antioxidant. The synthetic resin tube for radiant cooling and heating according to claim 1, wherein the metal layer is made of aluminum having a thickness of 0.1 to 2.0 mm. The synthetic resin pipe for radiant cooling and heating according to claim 1, 2, 3, 4, 5, 6 or 7 arranged in parallel, a tubular flow path through which a cooling / heating medium flows, and a plurality connected to the flow path And a synthetic resin pipe for radiant cooling / heating is attached to the opening of the header to form a panel. The radiation cooling / heating panel according to claim 8, wherein a synthetic resin pipe for radiation cooling / heating is disposed between the pair of headers. The header is provided with two tubular flow passages and a plurality of openings respectively communicating with the two tubular flow passages, and one end of a bent synthetic resin tube for radiation cooling / heating is provided with the one flow passage. The radiation cooling / heating panel according to claim 8, wherein the other end of the synthetic resin pipe for radiation cooling / heating is attached to the other flow path.

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