Radiation panel unit

Abstract

The present application provides a radiant panel unit capable of suppressing dew condensation on a surface on the side of a refrigeration target space. A radiant panel unit attached to the surface of a door trim or the like for facilitating refrigeration in a vehicle cabin is composed of a radiator having a fluid passage, a surface member arranged so as to face the vehicle cabin, and a heat-insulating space arranged between the radiator and the surface member. Furthermore, in the heat-insulating space, a heat-insulating space layer is provided by a plurality of heat-insulating members arranged in the overlapping direction of the radiator, the heat-insulating space, and the surface member. Thus, the temperature of the surface on the side of the vehicle cabin in the surface member can be suppressed from falling below the dew point, and dew condensation on the surface on the side of the vehicle cabin can be suppressed.

Description

Technical Field

[0001] This invention relates to a radiant panel unit. In particular, this invention relates to an improvement for suppressing condensation on the surface of the object to be cooled in the radiant panel unit. Background Technology

[0002] In recent years, radiative cooling systems, which cool the target space through radiation, have been increasingly adopted as a cooling system that balances energy saving and comfort. Such a radiative cooling system typically includes: a radiator with a flow path for a cooling fluid; and surface components facing the target space. Its structure allows the cooling fluid to cool the radiator, and the cooling energy is then radiated to the target space via the surface components.

[0003] Furthermore, Patent Document 1 discloses a structure in which an air retention layer is formed between a radiator and a surface film (surface component) disposed on its surface side.

[0004] Patent Document 1: Japanese Patent Application Publication No. 6-193915 Summary of the Invention However, in this type of radiant panel unit, although the lower the temperature of the radiator, the lower the temperature of the surface components, and the better the cooling effect, condensation will occur on the surface component if the temperature of the surface component on the cooling target space side is lower than the dew point. Regarding this point, the structure disclosed in Patent Document 1 may have insufficient thermal insulation performance based on the air retention layer, and is not sufficient as a countermeasure against condensation, leaving room for improvement.

[0005] The present invention was made in view of this, and its object is to provide a radiant panel unit capable of suppressing condensation on the surface of the object to be cooled.

[0006] The present invention provides a solution for achieving the aforementioned objective, which is a radiating panel unit comprising: a radiator having a cooling mechanism; a surface member arranged to face the space to be cooled; and a heat-insulating space disposed between the radiator and the surface member. Furthermore, the heat-insulating space of this radiating panel unit is composed of a plurality of heat-insulating space layers arranged along the overlapping direction of the radiator, the heat-insulating space, and the surface member.

[0007] By implementing this specific measure, the thermal insulation performance between the radiator and the surface component can be properly ensured, thereby preventing the temperature of the surface on the cooling target space side of the surface component from falling below the dew point. As a result, condensation on the surface on the cooling target space side can be suppressed.

[0008] As a more specific structure, a structure having three or more of the aforementioned thermal insulation space layers can be cited.

[0009] Therefore, insufficient thermal insulation between the radiator and the surface component can be suppressed, thereby reliably suppressing condensation on the surface of the object to be cooled in the surface component.

[0010] Furthermore, as a preferred structure, a desiccant may be disposed in at least one of the plurality of thermal insulation space layers.

[0011] Even when the temperature of the surface of the cooling target space in the surface component is not lower than the dew point (the dew point determined by the temperature and relative humidity of the cooling target space), the temperature of any insulation space layer may still be lower than the dew point (the dew point determined by the temperature and relative humidity of the insulation space layer). In this case, assuming condensation occurs in the insulation space layer, the temperature of the surface of the cooling target space in the surface component will drop (e.g., the condensed water may freeze), thus creating a situation where condensation is a concern. In this solution, by placing a desiccant in the insulation space layer, the humidity of the insulation space layer can be reduced (this lowers the dew point of the insulation space layer), thereby suppressing condensation in the insulation space layer and achieving an anti-fogging effect. Therefore, the situation where the temperature of the surface of the cooling target space in the surface component is lower than the dew point can be avoided, thereby suppressing condensation on the surface of the cooling target space in the surface component.

[0012] Furthermore, the surface component is made of a far-infrared transmissive material.

[0013] Therefore, the cold energy from the radiator can be effectively radiated to the space to be cooled through the insulation space and surface components, which helps to improve the comfort of the space to be cooled.

[0014] Furthermore, the surface component is made of materials with high far-infrared transmittance, such as germanium or chalcogenides, or polymers.

[0015] Therefore, the material of the surface component used to effectively radiate cold energy into the space to be cooled can be specifically determined. Furthermore, since the surface component can have high shape rigidity, the radiating panel unit as a whole can also ensure high shape rigidity, enabling the expansion of the application area of ​​the radiating panel unit.

[0016] Invention Effects In this invention, in a radiant panel unit having a radiator, a surface component, and a heat-insulating space disposed between the radiator and the surface component, the heat-insulating space is composed of multiple heat-insulating space layers. This prevents the temperature of the surface of the surface component on the side of the cooling target space from falling below the dew point, thereby suppressing condensation on that surface. Attached Figure Description

[0017] Figure 1This is a diagram showing an example of the configuration of a radiating panel unit inside the vehicle according to the embodiment.

[0018] Figure 2 This is an enlarged view of a portion of the radiant panel unit viewed from above, shown together with the refrigeration circuit.

[0019] Figure 3 (a) and Figure 3 (b) represents multiple examples of radiators. Figure 2 A sectional view taken along line III-III. Figure 3 (c) and Figure 3 (d) is a diagram showing several examples of how fluid channels are arranged in a radiator.

[0020] Figure 4 This is a perspective view showing multiple examples of insulation components that constitute the insulation space layer.

[0021] Figure 5 (a) is a diagram showing a portion of a surface part that has not undergone AR processing. Figure 5 (b) is a diagram showing a portion of the AR-processed surface part involved in the first variation. Figure 5 (c) is a diagram showing a portion of the AR-processed surface part involved in the second variation. Figure 5 (d) is a diagram showing a portion of the AR-processed surface part involved in the third variation. Figure 5 (e) is a diagram showing a portion of the AR-processed surface part involved in the fourth variation. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. This embodiment describes the application of the radiant panel unit according to the present invention to the cooling of the interior of a vehicle. Furthermore, the space to be cooled by the radiant panel unit according to the present invention is not limited to the interior of a vehicle, but can include various spaces such as the interiors of other vehicles such as trains or airplanes, the interiors of buildings such as residences or buildings, and the interiors of factories requiring cooling.

[0023] Figure 1 This diagram shows an example of the arrangement of radiating panel units 1, 1, ... in the interior R of a vehicle according to this embodiment. Figure 1 In order to clarify the configuration of each radiating panel unit 1, 1, ..., the driver's seat has been omitted.

[0024] like Figure 1As shown, in this embodiment, the radiating panel units 1 are respectively installed (attached) to the inner surfaces of the front door FSD and rear door RSD, the lower surface of the roof component CP, the surface of the instrument panel (including the instrument panel) IP, and the back of the front seat FS backrest SB. That is, each radiating panel unit 1, 1, ... is installed facing the interior R. The configuration of the radiating panel units 1, 1, ... is not limited to... Figure 1 The part shown can be at least one of these configuration parts, or it can be another part.

[0025] -Structure of the Radiating Panel Unit-- First, the structure of the radiator panel unit 1 will be described. Here, the structure of the radiator panel unit 1 installed on the inner side of the front door FSD will be used as an example. The radiator panel units 1 located in other parts also have the same structure.

[0026] Figure 2 This is an enlarged view of a portion of the radiant panel unit 1, shown from above, along with the refrigeration circuit 5. Figure 2 In the diagram of the radiating panel unit 1, the upper side is the outer side in the vehicle width direction, and the lower side is the inner side (R side inside the vehicle interior) in the vehicle width direction. The radiating panel unit 1 is installed on the door trim panel DT (in the inner side of the front door FSD) that constitutes the front door FSD. Figure 2 (Represented by imaginary lines in the middle).

[0027] like Figure 2 As shown, the radiating panel unit 1 is an integrated structure consisting of a radiator (also known as a radiating panel) 2, multiple heat insulation components 3A, 3B, 3C, and a surface component 4, which overlap along the vehicle width direction. That is, the radiator 2 is mounted on the door trim panel DT, and the surface component 4 is configured to face the interior R of the vehicle.

[0028] (Radiator) The radiator 2 has a shape that is substantially the same as the configuration location of the radiator panel unit 1 (e.g., substantially the same as the shape of the door trim panel DT of the front door FSD), and is made of a material with high far-infrared absorptivity (low reflectivity). Furthermore, the radiator 2 has internal fluid channels (in... Figure 2 (Represented by dashed lines) 21. Specific materials for this radiator 2 include metals (which can be anodized to improve far-infrared absorption), glass, resin, ceramics, etc.

[0029] Figure 3 (a) and Figure 3 (b) represents multiple examples of radiator 2. Figure 2 A sectional view taken along line III-III. Figure 3(a) A structure in which multiple fluid channels 21, 21, ... with rectangular cross-sections are formed along the extending direction of the radiator 2. Furthermore, Figure 3 (b) A structure in which multiple fluid channels 21, 21, ... are formed by joining corrugated sheet metal 22, 22 respectively formed by stamping. These figures show examples of the cross-sectional shape of the radiator 2, but the structure of the radiator 2 is not limited to these. Thus, the radiator 2 can be a component formed as a single part or a component composed of multiple parts joined together.

[0030] Moreover, such as Figure 2 As shown, the fluid channel 21 is connected to the refrigeration circuit 5, which circulates cooling water (antifreeze) to cool the radiator 2. The refrigeration circuit 5 includes a pump 51 and a heat exchanger 52. The pump 51 operates to circulate the cooling water in the refrigeration circuit 5. The heat exchanger 52 is the evaporator of the refrigerant circulation circuit 6 (not shown) in the air conditioning unit, enabling heat exchange between the refrigerant flowing through the heat exchanger (evaporator) 52 and the cooling water. More specifically, the refrigerant circulation circuit 6 includes, in parallel: an air conditioning evaporator (not shown), located within the air conditioning duct and used to cool air flowing towards the vehicle interior R; and a refrigeration evaporator, which constitutes the heat exchanger 52 and performs heat exchange between the refrigerant and the cooling water. Thus, the structure achieves a cooling effect where the refrigerant circulating in the refrigerant circulation circuit 6 cools the cooling water circulating in the refrigeration circuit 5 (e.g., below freezing point), and the cooled water is then pumped into the fluid channel 21 of the radiator 2 via the pump 51. In addition, the temperature of the cooling water is adjusted by the amount of cooling capacity supplied from the refrigerant to the cooling water in the evaporator (heat exchanger 52) of the refrigeration unit (e.g., the opening degree of the expansion valve located on the upstream side of the evaporator) or by the amount of cooling water circulating in the refrigeration unit circuit 5 controlled by the pump 51.

[0031] Figure 3 (c) and Figure 3 (d) is a diagram showing several examples of how the fluid channel 21 in the radiator 2 is arranged. Figure 3 (c) A structure in which an inlet manifold 23 is provided at the upper end of the radiator 2, an outlet manifold 24 is provided at the lower end, and these manifolds 23 and 24 are connected to each other through multiple fluid channels 21, 21, ... . Furthermore, Figure 3 (d) is a structure in which the upper half of the side portion of the radiator 2 has an inlet manifold 23 and the lower half has an outlet manifold 24, and these manifolds 23 and 24 are connected to each other by a plurality of fluid channels 21, 21, ... The examples shown in these figures are examples of the manner in which the fluid channels 21 in the radiator 2 are arranged, but the manner in which the fluid channels 21 are arranged is not limited to these.

[0032] Furthermore, in this embodiment, as a mechanism for cooling the radiator 2, a fluid channel 21 is provided inside the radiator 2, and cooling water from the refrigeration circuit 5 flows through the fluid channel 21. That is, the fluid channel 21 through which the cooling water flows serves as the cooling mechanism (the cooling mechanism provided in the radiator 2) in this invention. It is not limited to this; the radiator 2 can also be cooled by cooling air through the evaporator of the refrigerant circulation circuit 6 and then allowing that air to flow through the fluid channel 21. Furthermore, the radiator 2 can also be cooled by allowing a portion of the refrigerant from the circulating refrigerant circulation circuit 6 to flow through the fluid channel 21 and then evaporating that refrigerant in the fluid channel 21. Additionally, the radiator 2 can be cooled without utilizing the refrigerant circulation circuit 6 of the air conditioning unit. For example, a structure in which a cooling source such as a Peltier element is provided inside the radiator 2 can be cited.

[0033] (Insulation components) Figure 4 This is a perspective view showing multiple examples of heat insulation components 3A, 3B, and 3C constituting the heat insulation space layer. Each heat insulation component 3A, 3B, and 3C has the same structure and overlaps along the vehicle width direction. In the following description, the component of these heat insulation components 3A, 3B, and 3C located on the outermost side (radiator 2 side) in the vehicle width direction is referred to as the first heat insulation component 3A, the component located on the inner side of the first heat insulation component 3A in the vehicle width direction is referred to as the second heat insulation component 3B, and the component located on the inner side of the second heat insulation component 3B in the vehicle width direction (the component located on the innermost side (surface component 4 side) in the vehicle width direction) is referred to as the third heat insulation component 3C.

[0034] Figure 4 (a) The heat insulation components 3A, 3B and 3C shown are respectively composed of a frame 31 and membrane materials 32 and 32.

[0035] The frame 31 is made of resin or the like, and its shape is roughly the same as that of the radiator 2. Furthermore, film materials 32 and 32 are respectively attached to the outer and inner sides of the frame 31 in the vehicle width direction, and the inner space of the frame 31 is sealed by the film materials 32 and 32. For example, a thickness of about 5 mm can be used as the specific thickness of the frame 31 (the dimension in the vehicle width direction in the set state). This value is not limited to this and can be set appropriately.

[0036] By overlapping the heat insulation components 3A, 3B, and 3C as configured, along the vehicle width direction, the internal spaces of these heat insulation components 3A, 3B, and 3C (spaces sealed by the frame 31 and membrane materials 32, 32) constitute multiple independent heat insulation space layers 33A, 33B, and 33C, thereby forming the heat insulation space (the heat insulation space disposed between the radiator 2 and the surface component 4) in this invention. In the following description, the heat insulation space layer inside the first heat insulation component 3A is referred to as the first heat insulation space layer 33A, the heat insulation space layer inside the second heat insulation component 3B is referred to as the second heat insulation space layer 33B, and the heat insulation space layer inside the third heat insulation component 3C is referred to as the third heat insulation space layer 33C.

[0037] in addition, Figure 4 (a) Each of the heat insulation components 3A, 3B, and 3C shown has a membrane material 32 attached to its outer and inner sides in the vehicle width direction within the frame 31, respectively. However, it is also possible to configure a structure in which a single membrane material 32 is placed between the frames 31, 31 of adjacent heat insulation components 3A, 3B, and 3C. That is, a single membrane material 32 is placed between the frame 31 of the first heat insulation component 3A and the frame 31 of the second heat insulation component 3B, and a single membrane material 32 is placed between the frame 31 of the second heat insulation component 3B and the frame 31 of the third heat insulation component 3C.

[0038] Furthermore, it is preferable to arrange a desiccant (not shown) in each of the insulation space layers 33A, 33B, and 33C. This is because by reducing the humidity of each insulation space layer 33A, 33B, and 33C, condensation or freezing of moisture in each insulation space layer 33A, 33B, and 33C is avoided. There are no particular limitations on the desiccant; various desiccants such as silica (so-called silica gel), calcium oxide (quicklime desiccant), calcium chloride, synthetic zeolite, and clay-based desiccants can be used. Furthermore, there are no particular limitations on the arrangement of the desiccant in each insulation space layer 33A, 33B, and 33C; for example, it can be arranged along the inner surface of the frame 31 or mounted on a portion of the membrane materials 32, 32.

[0039] Figure 4 (b) The heat insulation components 3A, 3B, and 3C shown employ bubble cushioning material (polyethylene bubble cushioning material). This bubble cushioning material is known as a packaging material used in handling goods; it creates a cylindrical air pocket between two resin sheets, enclosing air, and uses this air pressure to achieve the function of a cushioning material. Therefore, the spaces between these air pockets or bubble cushioning materials (heat insulation components 3A, 3B, and 3C) form multiple non-communicating (independent) heat insulation space layers 33A, 33B, 33C, 33D, and 33E, thereby constituting the heat insulation space in this invention (the heat insulation space disposed between the radiator 2 and the surface component 4). That is, in Figure 4(b) shows that the air pocket in the first heat insulation component 3A becomes the first heat insulation space layer 33A, the air pocket in the second heat insulation component 3B becomes the second heat insulation space layer 33B, the air pocket in the third heat insulation component 3C becomes the third heat insulation space layer 33C, the space between the first heat insulation component 3A and the second heat insulation component 3B, and the area excluding the air pocket, becomes the fourth heat insulation space layer 33D, and the space between the second heat insulation component 3B and the third heat insulation component 3C, and the area excluding the air pocket, becomes the fifth heat insulation space layer 33E.

[0040] (Surface components) The surface component 4 is made of a transparent or semi-transparent sheet material whose shape is approximately the same as that of the aforementioned radiator 2 and the heat insulation components 3A, 3B, and 3C. Furthermore, the surface component 4 is made of a far-infrared transmitting material. Specifically, it is made of a material that is a polymer, such as germanium or chalcogenides, and has high transmittance for infrared (far-infrared) rays in the 3–40 μm range and sufficient shape rigidity. As an example, the thickness of the surface component 4 is set to 0.5 mm (in... Figure 2 In this context, surface component 4 is depicted as relatively thick compared to other components for easy observation. This value is not limited to this. Furthermore, the far-infrared transmitting material constituting surface component 4 is not limited to the aforementioned materials.

[0041] -Refrigeration operation inside the vehicle- Next, the cooling operation of the vehicle interior R of the radiant panel unit 1 configured as described above will be explained.

[0042] When a cooling request is received from the vehicle occupants, the refrigerant in the refrigerant circulation loop 6 is circulated (the compressor of the refrigerant circulation loop 6 is started) and the cooling water in the refrigeration circuit 5 is circulated (the pump 51 is started). Furthermore, in the heat exchanger 52, heat exchange occurs between the refrigerant in the circulating refrigerant circulation loop 6 and the cooling water in the circulating refrigeration circuit 5, cooling the cooling water, which flows into the fluid passage 21 of the radiator 2. Thus, the radiator 2 is cooled, for example, to below freezing. The target temperature of the radiator 2 at this time is adjusted according to the degree of the cooling request. For example, in the case of a high cooling request, the temperature of the radiator 2 is lowered by reducing the evaporation temperature of the refrigerant in the heat exchanger (evaporator) 52 or increasing the circulation rate of the cooling water in the refrigeration circuit 5. For example, the temperature of the radiator 2 is adjusted to approximately -8°C. This value is not limited to this.

[0043] The cooling energy of the radiator 2 is transferred to the internal spaces of the insulation components 3A, 3B, and 3C, namely the insulation space layers 33A, 33B, and 33C. At this time, due to the insulation effect of each insulation space layer 33A, 33B, and 33C, the temperature of each insulation space layer 33A, 33B, and 33C increases as it is located on the R side of the vehicle interior. For example, when the temperature of the radiator 2 is -8°C as described above, the temperature of the first insulation space layer 33A is -2°C, the temperature of the second insulation space layer 33B is 7°C, and the temperature of the third insulation space layer 33C is 16°C. In this case, the temperature of the surface component 4 facing the R side of the vehicle interior is, for example, 20°C. This temperature is the temperature at which condensation does not occur even when the temperature of the R side of the vehicle interior (e.g., the temperature around the surface component 4) is 25°C and the relative humidity is 70%. These temperatures are examples, and may not always be the exact temperatures described.

[0044] By distributing the radiant panel unit 1, which is adjusted to this temperature, to multiple locations in the vehicle interior R (in this embodiment, by distributing it to the inner side of the front door FSD and rear door RSD, the lower surface of the top component CP, the surface of the instrument panel IP, and the back of the front seat FS backrest SB), the vehicle interior R is effectively cooled while suppressing condensation on the surface of each radiant panel unit 1 on the vehicle interior R side (the surface of the surface component 4 on the vehicle interior R side).

[0045] If the cooling request from the vehicle occupants changes, the target temperature of the radiator 2 is adjusted accordingly. For example, the evaporation temperature of the refrigerant in the heat exchanger (evaporator) 52 or the circulation rate of the cooling water in the refrigeration circuit 5 is adjusted.

[0046] -Effects of the Implementation Method- As explained above, in this embodiment, in the radiant panel unit 1 having a radiator 2, a surface member 4, and a heat-insulating space disposed between the radiator 2 and the surface member 4, the heat-insulating space is composed of multiple heat-insulating space layers 33A, 33B, and 33C formed by multiple heat-insulating members 3A, 3B, and 3C. This prevents the temperature of the surface on the R side of the vehicle interior in the surface member 4 from falling below the dew point, thereby suppressing condensation on the R side of the vehicle interior.

[0047] Furthermore, in the aforementioned Patent Document 1, the surface component is composed of a surface film material (film), and the overall shape rigidity of the radiating panel unit is not sufficiently ensured. Therefore, it is prone to corrugated deformation due to wind, which can cause abnormal noise, or it is easily damaged by external forces. As a result, it cannot be used within the reach of a human hand. In particular, it cannot be used inside a vehicle. In contrast, in this embodiment, since both the radiator 2 and the surface component 4 have high shape rigidity, the radiating panel unit 1 as a whole also has high shape rigidity, ensuring durability against various external forces and enabling the expansion of its application area. In addition, in this invention, it is not necessary for both the radiator 2 and the surface component 4 to have high shape rigidity; it is also possible to design a structure in which only one of them has high shape rigidity.

[0048] Furthermore, in this embodiment, since it has three heat insulation space layers 33A, 33B, and 33C, it can suppress insufficient heat insulation performance between the radiator 2 and the surface component 4, and can reliably suppress condensation on the R-side surface of the vehicle interior in the surface component 4.

[0049] Furthermore, in this embodiment, a desiccant is disposed in each of the insulation space layers 33A, 33B, and 33C. Even when the temperature of the interior R-side surface of the surface component 4 is not lower than the dew point, the temperature of any of the insulation space layers 33A, 33B, and 33C may be lower than the dew point (the dew point determined by the temperature and relative humidity of the insulation space layers 33A, 33B, and 33C). In this case, assuming condensation occurs in the insulation space layers 33A, 33B, and 33C, this (e.g., the condensed water may freeze) will cause the temperature of the interior R-side surface of the surface component 4 to drop, thus creating a situation where condensation is a concern. In this embodiment, by pre-disposing a desiccant in each of the insulation space layers 33A, 33B, and 33C, the humidity of each insulation space layer 33A, 33B, and 33C can be reduced, and condensation in each insulation space layer 33A, 33B, and 33C can be suppressed to achieve an anti-fogging effect. Therefore, it is possible to avoid the temperature of the interior R-side surface of the surface component 4 being lower than the dew point, thereby suppressing condensation on the interior R-side surface of the surface component 4.

[0050] -Variations- Next, several modified examples will be described. This modified example is an improvement for enhancing the radiative cooling capacity and efficiency of the radiative panel unit 1. Specifically, it is a structure in which anti-reflective processing (hereinafter referred to as AR processing) is applied to the surface component 4.

[0051] Figure 5(a) is a diagram showing a portion of the surface component 4 without AR processing. That is, it is a diagram showing a portion of the surface component 4 according to the aforementioned embodiment. In this case, relative to the light incident on the surface component 4 (refer to the arrows indicated by solid lines in the diagram), a portion of the light is reflected with relatively high reflectivity on the back side (the surface in contact with the third heat insulation component 3C) and the surface (the surface facing the interior R of the vehicle) of the surface component 4 (refer to the arrows indicated by dashed lines in the diagram). This reflection reduces the radiative cooling capacity and efficiency based on the radiative panel unit 1. As an example, approximately 4% of the light is reflected on each surface of the surface component 4, and the overall transmittance of the surface component 4 is approximately 92%.

[0052] Figure 5 (b) is a diagram showing a portion of the AR-processed surface part 4 involved in the first variation. Figure 5 (b) shows an AR process in which magnesium fluoride 41 is coated only on the surface of the surface component 4 that contacts the third heat insulation component 3C. In this case, the reflectivity of the surface of the surface component 4 that contacts the third heat insulation component 3C is about 0.5%, and the transmittance of the surface component 4 as a whole is about 95.5%.

[0053] Figure 5 (c) is a diagram showing a portion of the AR-processed surface part 4 involved in the second variation. Figure 5 (c) shows an AR process in which magnesium fluoride 41 and 41 are coated on the surface of surface component 4 that contacts the third heat insulation component 3C and the surface facing the vehicle interior R, respectively. In this case, the reflectivity of each surface of surface component 4 is about 0.5%, and the transmittance of surface component 4 as a whole is about 99%.

[0054] Figure 5 (d) is a diagram showing a portion of the AR-processed surface part 4 involved in the third variation. Figure 5 (d) shows an AR process 42 in which only the surface in contact with the third heat insulation member 3C is made wavy. That is, a process is performed to suppress light reflection by slowly changing the surface refractive index. In this case, the reflectivity of the surface in contact with the third heat insulation member 3C in the surface member 4 is about 0%, and the transmittance of the surface member 4 as a whole is about 96%.

[0055] Figure 5 (e) is a diagram showing a portion of the AR-processed surface part 4 involved in the fourth variation. Figure 5(e) shows an AR process 42, 42 in which the surface of the surface member 4 that contacts the third heat insulation member 3C and the surface facing the vehicle interior R are respectively wavy. In this case, the reflectivity of each surface of the surface member 4 is about 0%, and the transmittance of the surface member 4 as a whole is about 99 to 100%.

[0056] Based on the above modifications, the radiative cooling capacity and efficiency of the radiative panel unit 1 can be improved. Furthermore, with this AR processing, the hydrophilicity of the surface component 4 is enhanced, making fog or condensation difficult to see even in assuming use in extremely humid environments. As a result, mold growth can be suppressed without the need for wiping.

[0057] Other implementation methods Furthermore, the present invention is not limited to the described embodiments and variations, but can include all variations or applications within the scope of the claims and equivalents thereof.

[0058] For example, in the described embodiments and their variations, the case where the heat insulation space layers 33A, 33B, and 33C are configured as three layers by including three heat insulation components 3A, 3B, and 3C has been explained. The present invention is not limited to this; the heat insulation space layers may also be configured as four or more layers. However, assuming that the structures of each heat insulation component 3A, 3B, and 3C are identical, as the number of heat insulation space layers increases, the temperature deviation between the radiator 2 and the surface component 4 becomes larger, potentially reducing the cooling effect. Therefore, it is preferable to configure the number of layers to be as low as possible within a range that prevents condensation.

[0059] Furthermore, in the described embodiments and their variations, a desiccant is disposed in each of the thermal insulation space layers 33A, 33B, and 33C. The present invention is not limited to this; a desiccant may also be disposed in one or both of the thermal insulation space layers 33A, 33B, and 33C. As described above, the reason for disposing of the desiccant is to obtain an anti-fogging effect in the thermal insulation space layers 33A, 33B, and 33C. Therefore, in each of the thermal insulation space layers 33A, 33B, and 33C, a desiccant may be disposed only in the thermal insulation space layers 33A, 33B, and 33C where the temperature may be lower than the dew point. Furthermore, in each of the insulation space layers 33A, 33B, and 33C, the temperature is lower closer to the radiator 2. Therefore, if desiccant is placed in only one of the insulation space layers 33A, 33B, and 33C, desiccant is placed only in the first insulation space layer 33A; if desiccant is placed in two of the insulation space layers 33A, 33B, and 33C, desiccant is placed in both the first insulation space layer 33A and the second insulation space layer 33B. This is... Figure 4(b) The same applies when a desiccant is placed in the fourth insulation space layer 33D or the fifth insulation space layer 33E in each of the insulation components 3A, 3B, and 3C shown.

[0060] This invention can be applied to radiant panel units installed in the interior of a vehicle.

[0061] Symbol Explanation 1-Radiant panel unit, 2-Radiator, 21-Fluid channel (cooling mechanism), 3A~3C: Thermal insulation components, 33A~33C: Insulation space layer, 4-Surface components, R-Vehicle interior (space to be refrigerated).

Claims

1. A radiating panel unit, comprising: A radiator, which has a cooling mechanism; Surface components, which are arranged in a manner oriented toward the space to be cooled; and A heat-insulating space is disposed between the radiator and the surface component. The radiating panel unit is characterized in that... The heat insulation space is composed of multiple heat insulation space layers arranged along the overlapping direction of the radiator, the heat insulation space and the surface component.

2. The radiating panel unit according to claim 1, characterized in that, It has three or more layers of the aforementioned heat insulation space layer.

3. The radiating panel unit according to claim 1 or 2, characterized in that, A desiccant is disposed in at least one of the plurality of thermally insulated space layers.

4. The radiating panel unit according to claim 1 or 2, characterized in that, The surface component is made of a far-infrared transmissive material.

5. The radiating panel unit according to claim 4, characterized in that, The surface components are made of germanium or chalcogenides.

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