JP2016188715A - Radiation cooling device and cooling light utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation cooling device which easily utilizes solar radiation of a wavelength of 2 μm or less.SOLUTION: A first window member 22 is configured as a member of which the transmissivity of light in a wavelength range of 0.3-2 μm is high and the transmissivity of light in a wavelength range of 8-13 μm is high. A second window member 24 is configured as a member of which the transmissivity of light in the wavelength range of 0.3-2 μm is high and the transmissivity of light in a wavelength range of 2-13 μm is high. A coolant flow passage member 26 that is disposed between the first window member 22 and the second window member 24 is configured as a member of which the transmissivity of light in the wavelength range of 0.3-2 μm is high and the transmissivity of light in the wavelength range of 8-13 μm is high. Thus, coldness can be applied to a coolant in a coolant flow passage 28 and sunlight from a side of the first window member 22 can be utilized by a sunlight utilization device 30 installed in the rear of a radiation cooling device 20. Since the sunlight utilization device 30 only needs to be disposed in the rear of the radiation cooling device 20, the radiation cooling device 20 is enabled to easily utilize light (sun radiation) in the wavelength range of 2 μm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radiant cooling device and a cooling light utilization system, and more particularly, to a radiant cooling device using radiant cooling and a cooling light utilization system that functions as such a radiant cooling device and also functions as a sunlight utilization device that functions by light. About.

  Conventionally, as this type of radiant cooling device, a heat radiator in which a refrigerant channel is formed in a hollow portion of an insulating container in which an opening is covered with a translucent polyethylene film and an aluminum foil is attached to the bottom. What is provided is proposed (for example, refer patent document 1). The thermal radiator is configured as a two-layer structure in which a mirror surface aluminum plate is coated with Aflex film (registered trademark), which is a kind of vinylidene difluoride, and exhibits high radiation in a specific wavelength range of 8 to 13 μm. High reflectivity with respect to light in other wavelength regions. Therefore, the thermal radiator reflects most of the solar radiation having a wavelength of 4 μm or less and absorbs only the thermal radiation in the wavelength region of 8 to 13 μm with respect to the irradiation of sunlight from the opening. Thereby, cold heat can be given to a refrigerant | coolant by radiation cooling regardless of day and night.

Japanese Patent Laid-Open No. 58-83168

  However, since the above-mentioned radiation cooling apparatus reflects most of the solar radiation with a wavelength of 4 μm or less, it cannot be used for most of the solar radiation. To solve this problem, it can be combined with a heat collector that receives reflected solar radiation and collects heat. However, since the direction of sunlight changes with time, the reflected light is guided to the heat collector over time. The need arises and the device becomes larger.

  The main object of the radiant cooling device of the present invention is to propose a radiant cooling device that can easily use solar radiation with a wavelength of 2 μm or less. Moreover, the cooling light utilization system of this invention aims at providing the system which combines the function of the radiation cooling device using radiation cooling, and the function of the sunlight utilization device which functions by the solar radiation of a wavelength of 2 micrometers or less.

  The radiant cooling device and the cooling light utilization system of the present invention employ the following means in order to achieve the main object described above.

The radiant cooling device of the present invention comprises:
A radiant cooling device using radiant cooling,
A first window member having a high light transmittance in a wavelength region of 0.3 μm to 2 μm and a high light transmittance in a wavelength region of 8 μm to 13 μm;
A second window member having a high light transmittance in a wavelength region of 0.3 μm to 2 μm and a high reflectance of light in a wavelength region of 2 μm to 13 μm;
It arrange | positions between the said 1st window member and the said 2nd window member, the flow path of a refrigerant | coolant is formed in the inside, the light transmittance of the wavelength range of 0.3 micrometer-2 micrometers is high, and the wavelength range of 8 micrometers-13 micrometers A refrigerant flow path member having a high emissivity of light,
It is a summary to provide.

  In this radiant cooling device of the present invention, the first window member, the refrigerant flow path member, and the second window member are arranged in this order. For light in the wavelength range of 8 μm to 13 μm, the first window member has a high transmittance, and the refrigerant channel member has a high emissivity. In the second window member, the reflectance of light in the wavelength region of 2 μm to 13 μm is high. Therefore, most of the light in the wavelength range of 2 μm to 13 μm from the second window member side is reflected, and most of the light in the wavelength range of 8 μm to 13 μm radiated from the coolant channel member is transmitted from the first window member side. To do. As a result, the cooling flow path member is cooled, and cold heat can be imparted to the refrigerant. On the other hand, for the light in the wavelength range of 0.3 μm to 2 μm, the first window member, the second window member, and the refrigerant flow path member all have high transmittance. Permeates the radiant cooling device. Therefore, light having a wavelength range of 0.3 μm to 2 μm can be used via the radiation cooling device. As a result, the radiation cooling device of the present invention can easily use solar radiation with a wavelength of 2 μm or less. Here, “high transmittance”, “high reflectance”, and “high emissivity” are at least 50% or more on average in this specification, preferably 70% or more, preferably Means 80% or more, more preferably 90% or more. The same applies hereinafter. “Refrigerant” means a heat exchange medium for cooling. The same applies to the following.

  In such a radiant cooling device of the present invention, the first window member may be configured using a barium fluoride base material. In this case, the first window member may be configured by pressure-bonding a polyethylene film to the base material. If it carries out like this, it can be set as the 1st window member with the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-13 micrometers.

  In the radiant cooling device of the present invention, the second window member is formed by forming a thin film of stannic oxide on a glass substrate having a high light transmittance in a wavelength region of 0.3 μm to 2 μm. It is good as it is. If it carries out like this, it can be set as the 2nd window member with the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-2 micrometers, and the high reflectance of the light of the wavelength range of 2 micrometers-13 micrometers.

  Further, in the radiant cooling device of the present invention, the refrigerant flow path member is made of a high transmission glass having a high light transmittance in a wavelength region of 0.3 μm to 2 μm and a high light transmittance in a wavelength region of 8 μm to 13 μm. It is good also as what is comprised using.

The cooling light utilization system of the present invention is
A cooling light utilization system that uses radiation cooling and solar radiation,
The radiant cooling device of the present invention according to any one of the above-described aspects;
A solar light utilization device that functions by light in the wavelength range of 0.3 μm to 2 μm that has passed through the radiation cooling device;
It is a summary to provide.

  In the cooling light utilization system according to the present invention, the radiant cooling device includes the first window member, the second window member, and the refrigerant flow path member as described above, and therefore cools the refrigerant of the refrigerant flow path member by radiant cooling. Can be granted. The radiant cooling device transmits light in the wavelength range of 0.3 μm to 2 μm, and the solar light utilization device functions with light in the wavelength range of 0.3 μm to 2 μm. As a result, it is possible to combine the function of a radiant cooling device using radiant cooling and the function of a solar light utilization device that functions by solar radiation with a wavelength of 2 μm or less. Here, examples of the solar light utilization device include a solar power generation device using a solar panel, a heat collection device that collects heat by solar radiation, a daylighting device that uses daylighting, and the like.

  In the cooling light utilization system of the present invention, the solar light utilization device has a heat medium flow path formed therein, and absorbs light in the wavelength range of 0.3 μm to 2 μm that has passed through the radiation cooling device. It can also be set as the heat collecting apparatus provided with the heat collecting part with a high rate. If it carries out like this, warm heat can be provided to a heat carrier using the light of the wavelength range of 0.3 micrometer-2 micrometers which permeate | transmitted the radiation cooling device. Here, the “heat medium” means a heat exchange medium for heating. The same applies to the following.

  The cooling light utilization system of this aspect of the present invention may further include a heat insulating part that forms a vacuum heat insulating layer between the second window member of the radiant cooling device and the heat collecting part. In this way, since the heat insulating part is arranged between the radiant cooling device and the heat collecting part, the cold heat of the refrigerant of the radiant cooling device is conducted to the heat collecting part, or the heat of the heat medium in the heat collecting part is radiated. Heat conduction to the cooling device can be suppressed. Moreover, the said heat collection part is formed in the cylindrical shape, and the said radiation cooling device is good also as what is formed in the annular | circular shape at the outer peripheral side of the said heat collection part. If it carries out like this, it can arrange | position in order of a heat collecting part, a heat insulation part, and a radiation cooling device from an inner diameter side, and can form in a cylindrical shape.

It is a block diagram which shows the outline of a structure of the cooling light utilization system 10 of embodiment. It is a graph which shows the spectral transmittance of the 1st window member 22 of an example. It is a graph which shows the spectral transmittance and the spectral reflectance of the 2nd window member 24 of an Example. It is a graph which shows the spectral transmission factor and the spectral emissivity of the refrigerant flow path member 26 of an Example. It is a block diagram which shows the outline | summary of a structure of the cooling light utilization system 100 of an Example. It is explanatory drawing explaining the cross-section of the cooling heat collector.

  Next, the form for implementing this invention is demonstrated using an Example. FIG. 1 is a configuration diagram showing an outline of a configuration of a cooling light utilization system 10 according to an embodiment of the present invention. The cooling light utilization system 10 of the embodiment includes a radiation cooling device 20 that imparts cold heat to a refrigerant by radiation cooling and a solar light utilization device 30 that functions by solar radiation. Here, “refrigerant” means a heat exchange medium for cooling, and “heat medium” to be described later means a heat exchange medium for heating. FIG. 1 schematically shows a cross-sectional structure of the radiant cooling device 20. Examples of the solar light utilization device 30 include a well-known solar heat collecting device, a well-known solar power generation device, and a well-known daylighting device.

  As shown in the figure, the radiant cooling device 20 includes a first window member 22 attached to one opening (upper part in the figure) of a heat insulating container 29 as a frame member, and the other opening (in the figure, the heat insulating container 29). A second window member 24 attached to the lower part, and a refrigerant flow path member 26 disposed between the first window member 22 and the second window member 24.

The 1st window member 22 is comprised as a member with the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-2 micrometers, and the high transmittance | permeability of the light of the wavelength range of 8 micrometers-13 micrometers. For example, although it is good also as a member with the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-13 micrometers, it does not permeate | transmit the light of wavelength ranges other than the wavelength range of 0.3 micrometer-2 micrometers and 8 micrometer-13 micrometers. What reflects is preferable. The first window member 22, it is possible to use those coated with a coating material such as polyethylene film substrate such as barium fluoride (BaF ₂₎ or a diamond. Here, “high transmittance” means, on average, at least 50% or more, preferably 70% or more, preferably 80% or more, more preferably 90% or more. Is intended. The same applies to the following “high transmittance”.

  The second window member 24 is configured as a member having a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high reflectivity of light in a wavelength range of 2 μm to 13 μm. As the second window member 24, for example, a thin film of metal oxide such as stannic oxide or metal (wavelength range of 2 μm to 13 μm) on a glass substrate having a high light transmittance in the wavelength range of 0.3 μm to 2 μm. A film having a high light reflectivity) can be used. Here, “high reflectivity” means, on average, at least 50% or more, preferably 70% or more, preferably 80% or more, more preferably 90% or more. Is intended. The same applies to the following “high reflectance”.

  The refrigerant channel member 26 has a refrigerant channel 28 formed therein, and has a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high emissivity of light in a wavelength range of 8 μm to 13 μm. It is configured as. For example, it is good also as a member with the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-2 micrometers, and the high emissivity of the light of the wavelength range of 2 micrometers-13 micrometers. The coolant channel member 26 may be formed using, for example, a highly transmissive glass having a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high light emissivity in a wavelength range of 2 μm to 13 μm. it can. Here, “high emissivity” means, on average, at least 50% or more, preferably 70% or more, preferably 80% or more, more preferably 90% or more. Is intended. The same applies to the following “high emissivity”.

  In the radiant cooling device 20, the first window member 22 has a high transmittance and the refrigerant channel member 26 has a high emissivity with respect to light in the wavelength range of 8 μm to 13 μm. In the 2nd window member 24, the reflectance of the light of a wavelength range of 2 micrometers-13 micrometers is high. For this reason, most of the light in the wavelength range of 2 μm to 13 μm from the second window member 24 side is reflected, and most of the light in the wavelength range of 8 μm to 13 μm emitted from the coolant channel member 26 is reflected in the first window member 22. Permeate from the side. As a result, the cooling flow path member 26 is cooled, and cold heat can be imparted to the refrigerant. On the other hand, for the light in the wavelength range of 0.3 μm to 2 μm, the first window member 22, the second window member 24, and the refrigerant flow path member 26 all have high transmittance. Most of the light passes through the radiant cooling device 20. For this reason, the light in the wavelength range of 0.3 μm to 2 μm that has passed through the radiation cooling device 20 can be used by the solar light utilization device 30 disposed behind the radiation cooling device 20 (lower side in the figure).

Next, an embodiment of the radiant cooling device 20 will be described. In the embodiment, for the first window member 22, a base material 22a of barium fluoride (BaF ₂ ) is covered with a polyethylene film coating material 22b. As the second window member 24, a thin film 24b (light reflectance in a wavelength range of 2 μm to 20 μm) is formed by sputtering stannic oxide on a glass substrate 24a having a high light transmittance in a wavelength range of 0.3 μm to 2 μm. High film). As the refrigerant flow path member 26, a recess that forms the refrigerant flow path 28 in a highly transmissive glass having a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high emissivity of light in a wavelength range of 2 μm to 13 μm. Then, the base materials 26a and 26b were bonded so that the concave portions were aligned. FIG. 2 shows the spectral transmittance of the first window member 22 of the embodiment, FIG. 3 shows the spectral transmittance and spectral reflectance of the second window member 24 of the embodiment, and FIG. 4 shows the refrigerant flow path of the embodiment. The spectral transmittance and spectral emissivity of the member 26 are shown. As shown in FIG. 2, the 1st window member 22 of an Example has the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-13 micrometers. As shown in FIG. 3, the 2nd window member 24 of an Example has the high transmittance | permeability of the light of the wavelength range of 0.3 micrometer-2 micrometers, and the reflectance of the light of the wavelength range of 2 micrometers-20 micrometers. As shown in FIG. 4, the refrigerant flow path member 26 of the embodiment has a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high emissivity of light in a wavelength range of 2 μm to 13 μm. Therefore, in the embodiment, the light from the wavelength range of 0.3 μm to 2 μm is transmitted for the light from the first window member 22 side, and the light from the wavelength range of 2 μm to 20 μm from the second window member 24 side ( (Including thermal radiation) is reflected, and light (thermal radiation) in the wavelength region of 8 μm to 13 μm from the refrigerant flow path member 26 is radiated to the outside from the first window member 22. As a result, the refrigerant flow path member 26 is cooled, and cold heat can be imparted to the refrigerant in the refrigerant flow path 28. Of course, light (sunlight) in the wavelength range of 0.3 μm to 2 μm from the first window member 22 side can be used by the solar light utilization device 30 behind.

  Next, the Example at the time of using a solar heat collecting device as the sunlight utilization apparatus 30 is described. FIG. 5 is a configuration diagram illustrating an outline of a configuration of the cooling light utilization system 100 according to the embodiment. The cooling light utilization system 100 of the embodiment functions as a radiant cooling device and also functions as a heat collecting device, a plurality of elongated cooling collectors 110 having a cylindrical shape, and heat exchange with the refrigerant from the cooling heat collector 110 to cool the heat. A heat storage unit 120 that stores heat and a heat storage unit 130 that stores heat by exchanging heat with the heat medium from the cooling heat collector 110. The cold heat storage unit 120 supplies and collects the refrigerant to each cooling collector 110 and the refrigerant supply / recovery unit 122, and the cold heat storage unit 124 that stores the cold heat by heat exchange with the refrigerant collected by the refrigerant supply / recovery unit 122. And a refrigerant circulation pipe 126 for circulating the refrigerant through the refrigerant supply / recovery unit 122 and the cold heat storage unit 124. The heat storage unit 130 stores heat by heat exchange between the heat medium supply / recovery unit 132 that supplies or recovers the heat medium to each cooling heat collector 110 and the heat medium recovered by the heat medium supply / recovery unit 132. A heat medium recirculation pipe 136 that circulates the heat medium in the heat medium regenerator 134, the heat medium supply / recovery unit 132, and the heat medium heat regenerator 134 is provided.

FIG. 6 is an explanatory diagram for explaining a cross-sectional structure of the cooling heat collector 110. The cooling heat collector 110 includes a first window member 222, a refrigerant flow path member 226, a second window member 224, and a heat collection member 232 from the outer peripheral side. The first window member 222 is formed by pressure-bonding a polyethylene film covering material to the outer peripheral surface of a barium fluoride (BaF ₂ ) base material formed in a pipe shape, similarly to the first window member 22 of the radiation cooling device of the embodiment. It is configured to cover. The refrigerant channel member 226 has a high transmittance of light in the wavelength region of 0.3 μm to 2 μm and a high emissivity of light in the wavelength region of 2 μm to 13 μm, similarly to the refrigerant channel member 26 of the embodiment. It is comprised by the two base materials 226a and 226b which formed the glass in the pipe shape from which a diameter differs, and the refrigerant | coolant flow path 228 is formed between the base materials 226a and 226b. Similar to the second window member 24 of the embodiment, the second window member 224 is second oxidized on the outer peripheral surface of a base material in which glass having a high light transmittance in the wavelength region of 0.3 μm to 2 μm is formed in a pipe shape. It is configured by forming a thin film by sputtering tin. The heat collecting member 232 is configured by applying a well-known selective absorbing material that absorbs solar radiation and does not emit heat to the outer peripheral surface of a glass substrate formed in a pipe shape, for example, a heat conductive coating, an infrared absorbing coating, and an antireflection coating. The heat medium flow path 234 is formed inside. A vacuum heat insulating layer 240 is provided between the second window member 224 and the heat collecting member 232.

  In the cooling heat collector 110, light (irradiation) in the wavelength region of 0.3 μm to 2 μm passes through the first window member 222, the refrigerant flow path member 226, and the second window member 224 and is absorbed by the heat collection member 232. Then, warm heat is applied to the heat medium in the heat medium flow path 234. Heat radiation from the heat medium in the heat medium flow path 234 is inhibited by the heat collecting member 232. On the other hand, since light (heat radiation) in the wavelength region of 8 μm to 13 μm from the refrigerant flow path member 226 is radiated to the outside from the first window member 222, cold heat is applied to the refrigerant in the refrigerant flow path 228. Since the vacuum heat insulating layer 240 is formed between the second window member 224 and the heat collecting member 232, the heat of the heat collecting member 232 conducts heat to the second window member 224 side, or the second window member 224. It is possible to suppress the cold heat on the side from conducting heat to the heat collecting member 232 side.

  According to the radiation cooling device 20 of the embodiment described above, the first window member 22 has a high light transmittance in the wavelength region of 0.3 μm to 2 μm and a high light transmittance in the wavelength region of 8 μm to 13 μm. The second window member 24 is configured as a member having a high light transmittance in the wavelength region of 0.3 μm to 2 μm and a high reflectance of the light in the wavelength region of 2 μm to 20 μm, and the first window member 22 The refrigerant flow path member 26 disposed between the second window member 24 and the second window member 24 is configured as a member having a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high emissivity of light in a wavelength range of 8 μm to 13 μm. Thereby, while being able to provide cold heat to the refrigerant | coolant of the refrigerant | coolant flow path 28, the sunlight from the 1st window member 22 side can be utilized with the sunlight utilization apparatus 30 of back. Since the solar light utilization device 30 only needs to be disposed behind the radiation cooling device 20 of the embodiment, the radiation cooling device 20 of the embodiment can easily use light (sunlight) in a wavelength region of 2 μm or less.

  In the cooling light utilization system 10 of the embodiment, the solar light utilization device that functions by the function of the radiation cooling device 20 using the radiation cooling and the solar radiation with a wavelength of 2 μm or less by including the radiation cooling device 20 and the solar light utilization device 30. It can have 30 functions.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  The present invention can be used in the manufacturing industry of radiant cooling devices and cooling light utilization systems.

  10,100 Cooling light utilization system, 20 Radiation cooling device, 22,222 First window member, 22a base material, 22b Cover material, 24,224 Second window member, 24a base material, 24b Thin film, 26,226 Refrigerant flow path Member, 26a, 26b, 226a, 226b Base material, 28, 228 Refrigerant flow path, 29 Heat insulation container, 30 Solar-powered device, 110 Cooling heat collector, 120 Cold heat storage unit, 122 Refrigerant supply and recovery unit, 124 Cold heat storage device 126 Refrigerant circulation pipe, 130 Heat storage part, 132 Heat medium supply and recovery unit, 134 Heat storage unit, 136 Heat medium circulation pipe, 232 Heat collecting member, 234 Heat medium flow path, 240 Vacuum heat insulation layer.

Claims (9)

A radiant cooling device using radiant cooling,
A first window member having a high light transmittance in a wavelength region of 0.3 μm to 2 μm and a high light transmittance in a wavelength region of 8 μm to 13 μm;
A second window member having a high light transmittance in a wavelength region of 0.3 μm to 2 μm and a high reflectance of light in a wavelength region of 2 μm to 13 μm;
It arrange | positions between the said 1st window member and the said 2nd window member, the flow path of a refrigerant | coolant is formed in the inside, the light transmittance of the wavelength range of 0.3 micrometer-2 micrometers is high, and the wavelength range of 8 micrometers-13 micrometers A refrigerant flow path member having a high emissivity of light,
A radiant cooling device comprising: The radiant cooling device according to claim 1,
The first window member is configured using a base material of barium fluoride,
Radiant cooling device. A radiant cooling device according to claim 2,
The first window member is configured by pressure-bonding a polyethylene film to the base material,
Radiant cooling device. A radiant cooling device according to any one of claims 1 to 3,
The second window member is configured by forming a thin film of stannic oxide on a glass substrate having a high light transmittance in a wavelength range of 0.3 μm to 2 μm.
Radiant cooling device. A radiant cooling device according to any one of claims 1 to 4,
The refrigerant flow path member is configured by using a high transmission glass having a high light transmittance in a wavelength range of 0.3 μm to 2 μm and a high emissivity of light in a wavelength range of 8 μm to 13 μm.
Radiant cooling device. A cooling light utilization system that uses radiation cooling and solar radiation,
A radiant cooling device according to any one of claims 1 to 5,
A solar light utilization device that functions by light in the wavelength range of 0.3 μm to 2 μm that has passed through the radiation cooling device;
Cooling light utilization system. It is a cooling light utilization system of Claim 6, Comprising:
The solar light utilization device is a heat collecting device having a heat collecting portion in which a flow path of a heat medium is formed and a high light absorption rate of light in the wavelength range of 0.3 μm to 2 μm that is transmitted through the radiation cooling device. is there,
Cooling light utilization system. It is a cooling light utilization system of Claim 7, Comprising:
A heat insulating part forming a vacuum heat insulating layer between the second window member of the radiant cooling device and the heat collecting part;
Cooling light utilization system. The cooling light utilization system according to claim 7 or 8,
The heat collecting part is formed in a cylindrical shape,
The radiant cooling device is formed in an annular shape on the outer peripheral side of the heat collecting part,
Cooling light utilization system.

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