Heat cycle system using light
The heat cycle system efficiently uses light to absorb and release heat by reflecting it back and forth between heat exchange units, reducing costs by eliminating the need for optical isolators and optimizing rare earth-doped fiber rods and wavelength management.
Patent Information
- Application Number
- JP2024114044
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2026-01-29
AI Technical Summary
Conventional heat cycle systems using optical fibers doped with ytterbium and ordinary optical fibers are costly due to the need for multiple optical isolators to efficiently circulate light, which allow light to pass in only one direction.
A heat cycle system that uses an optical transmission path with a light source, first and second heat exchange units, and reflecting units to reflect light back and forth between the units, eliminating the need for optical isolators by using rare earth-doped optical fiber rods and dichroic or Bragg gratings to manage light wavelengths.
The system efficiently absorbs and releases heat using light while reducing costs by allowing light to oscillate between reflecting units, stabilizing heat emission and absorption without the need for expensive optical isolators.
Smart Images
Figure 2026013599000001_ABST
Abstract
Description
[Technical Field]
[0001] The present disclosure relates to a heat cycle system that uses light to absorb and release heat. [Background technology]
[0002] A heat cycle system has been known in the past, including an endless optical transmission line including first and second heat exchangers and a light source that inputs light of a predetermined wavelength into the optical transmission line (see, for example, Patent Document 1). The first heat exchanger of this heat cycle system is located downstream of the light source in the optical transmission line. When a system excited by light of a predetermined wavelength from the light source returns to its ground state, the first heat exchanger absorbs or releases heat and outputs light of a different wavelength. The second heat exchanger is located downstream of the first heat exchanger in the optical transmission line. When a system excited by light from the first heat exchanger returns to its ground state, the second heat exchanger releases or absorbs heat and converts the wavelength of the light from the first heat exchanger to the predetermined wavelength, and supplies the light of the predetermined wavelength to the first heat exchanger. In this heat cycle system, light input from the light source to the optical transmission line can be circulated through the endless optical transmission line, allowing the first and second heat exchangers to release or absorb heat using the light from the light source. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-87939 Summary of the Invention [Problem to be solved by the invention]
[0004] In the above-described conventional heat cycle system, the first and second heat exchange units are formed of optical fibers having a core doped with ytterbium (Yb), and the optical transmission lines other than the first and second heat exchange units are formed of ordinary optical fibers whose cores are not doped with rare earth elements. Furthermore, in order to efficiently circulate light in the endless optical transmission line, it is preferable to interpose an optical isolator between the first and second heat exchange units and the other optical transmission lines. However, optical isolators, which allow light to pass only in one direction, are very expensive, and the use of multiple optical isolators increases the cost of the heat cycle system.
[0005] Therefore, a main object of the present disclosure is to provide a heat cycle system that can efficiently use light from a light source to release and absorb heat while suppressing increases in costs. [Means for solving the problem]
[0006] The heat cycle system of the present disclosure is a heat cycle system that absorbs or releases heat using light, and includes an optical transmission path extending from one end to the other end, a light source that inputs light of a first wavelength to the one end side of the optical transmission path, a first heat exchange unit that is provided at the one end side of the optical transmission path and absorbs the light of the first wavelength to generate light of a second wavelength different from the first wavelength and releases or absorbs heat, a second heat exchange unit that is provided at the other end side of the optical transmission path and absorbs the light of the second wavelength to generate light of the first wavelength and absorbs or releases heat, a first reflecting unit at the other end of the optical transmission path that reflects light from the second heat exchange unit toward the one end side, and a second reflecting unit at the one end of the optical transmission path that reflects light from the first heat exchange unit toward the other end side.
[0007] In the heat cycle system disclosed herein, light of a first wavelength incident from a light source onto one end of an optical transmission path is absorbed by a first heat exchanger provided at that end of the optical transmission path. Accordingly, the first heat exchanger generates light of a second wavelength different from the first wavelength (Stokes luminescence or anti-Stokes luminescence) and releases or absorbs heat equivalent to the energy difference between the input light of the first wavelength and the output light of the second wavelength. That is, when a system excited by light of the first wavelength returns to its ground state, the first heat exchanger releases or absorbs heat and generates light of the second wavelength different from the first wavelength. Furthermore, at least a portion of the light of the second wavelength generated by the first heat exchanger is absorbed by a second heat exchanger provided at the other end of the optical transmission path. Accordingly, the second heat exchanger generates light of the first wavelength (anti-Stokes luminescence or Stokes luminescence) and absorbs or releases heat equivalent to the energy difference between the input light of the second wavelength and the output light of the first wavelength. That is, when the system excited by the light of the second wavelength returns to the ground state, the second heat exchange section absorbs or releases heat and generates the light of the first wavelength.
[0008] Furthermore, the light of the second wavelength that has passed through the second heat exchange unit and the light of the first wavelength generated in the second heat exchange unit are reflected by a first reflecting unit at the other end of the optical transmission line toward one end of the optical transmission line, and the light of the first and second wavelengths reflected by the first reflecting unit travel from the second heat exchange unit to the first heat exchange unit. At least a portion of the light of the second wavelength that has reflected by the first reflecting unit is absorbed by the second heat exchange unit, and as a result, the second heat exchange unit generates light of the first wavelength (anti-Stokes emission or Stokes emission) and absorbs or releases heat. Furthermore, the light of the first wavelength generated in the second heat exchange unit travels from the second heat exchange unit to the first heat exchange unit and is absorbed by the first heat exchange unit, and as a result, the first heat exchange unit generates light of the second wavelength (Stokes emission or anti-Stokes emission) and absorbs or releases heat. Then, the second wavelength light reflected by the first reflecting section and the second wavelength light generated in the first heat exchange section are reflected by the second reflecting section at one end of the optical transmission path toward the other end of the optical transmission path, and proceed to the first and second heat exchange sections.
[0009] As a result, the heat cycle system of the present disclosure allows light from the light source to travel back and forth between the first and second reflecting sections, efficiently emitting or absorbing heat in the first and second heat exchange sections. Furthermore, after the light source starts operating, if light is incident from the light source into the optical transmission path so as to compensate for the difference or loss between the energy emitted by the first or second heat exchange section and the energy absorbed by the second or first heat exchange section, heat can be stably emitted or absorbed in the first and second heat exchange sections. Furthermore, a heat cycle system that oscillates light from the light source back and forth between the first and second reflecting sections does not require an optical isolator that allows light to pass only in one direction, thereby reducing costs. As a result, the heat cycle system of the present disclosure allows efficient use of light from the light source to emitting and absorbing heat while reducing costs. It goes without saying that the first and second wavelengths are not limited to constant values and can vary somewhat. [Brief explanation of the drawings]
[0010] [Figure 1] 1 is a schematic diagram showing a heat cycle system according to the present disclosure. FIG. [Figure 2] FIG. 2 is a schematic diagram for explaining the operation of the heat cycle system of the present disclosure. [Figure 3] FIG. 2 is a schematic diagram for explaining the operation of the heat cycle system of the present disclosure. [Figure 4] 10 is a diagram illustrating the light intensity in the optical transmission path of the heat cycle system of the present disclosure. [Figure 5] FIG. 10 is a schematic diagram illustrating another heat cycle system of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION
[0011] Next, embodiments of the present disclosure will be described with reference to the drawings.
[0012] FIG. 1 is a schematic diagram showing a heat cycle system 1 according to the present disclosure. The heat cycle system 1 shown in the figure absorbs and releases heat using light. As shown in the figure, the heat cycle system 1 includes an optical transmission line 2 having ends and extending substantially linearly from one end to the other, a light source (excitation light source) 3 that inputs light to the optical transmission line 2, and a control device 10 that controls the light source 3. The optical transmission line 2 also includes a first heat exchanger 4 provided at one end (the left end in FIG. 1 ), a second heat exchanger 5 provided at the other end (the right end in FIG. 1 ), an optical coupler 6 interposed between the first heat exchanger 4 and the second heat exchanger 5, a first reflector 7, and a second reflector 8.
[0013] In this embodiment, the first heat exchanger 4 of the optical transmission line 2 is formed by an optical fiber rod 40 with a relatively large diameter. The optical fiber rod 40 includes a core 41 doped with a rare earth element (additive) and a cladding 42 surrounding the core 41. In this embodiment, the core 41 of the optical fiber rod 40 is a silica core containing silica doped with ytterbium (Yb). The cladding 42 is a single cladding, double cladding, or multi-cladding. The first heat exchanger 4 exchanges heat with a first heat exchange object O1, such as a heat sink or a fluid (heat medium), directly or via a heat transfer member (heat transfer tube) (not shown) fixed to or wound around the optical fiber rod 40.
[0014] In this embodiment, the second heat exchanger 5 of the optical transmission line 2 is formed by an optical fiber rod 50 with a relatively large diameter. The optical fiber rod 50 includes a core 51 doped with a rare earth element (additive) and aluminum (Al), and a cladding 52 surrounding the core 51. In this embodiment, the core 51 of the optical fiber rod 50 is a silica core containing silica doped with ytterbium and aluminum. The cladding 52 is preferably a double cladding or multi-cladding, but may also be a single cladding. In this embodiment, the second heat exchanger 5 exchanges heat with a second heat exchange object O2, such as an electronic component or an electromagnetic component, directly or via a heat transfer member (heat transfer tube) (not shown) fixed to or wound around the optical fiber rod 50.
[0015] The optical coupler 6 optically connects the optical fiber rod 40 forming the first heat exchange unit 4 and the optical fiber rod 50 forming the second heat exchange unit 5, and includes a pair of lenses 60. This allows light to travel between the first and second heat exchange units 4, 5 while reducing loss, even if the core diameter of the optical fiber rod 40 does not match the core diameter of the optical fiber rod 50. The first reflecting unit 7 is, for example, a dichroic filter, a WDM filter, or a Bragg grating, and is joined to the end of the optical fiber rod 50 (second heat exchange unit 5) opposite to the optical coupler 6 side, i.e., the other end of the optical transmission line 2. In this embodiment, the first reflecting unit 7 is formed to reflect, for example, laser light with a wavelength of 900 nm or more. The second reflecting unit 8 is, for example, a dichroic filter, a WDM filter, or a Bragg grating, and is joined to the end of the optical fiber rod 40 (first heat exchange unit 4) opposite to the optical coupler 6 side, i.e., one end of the optical transmission line 2. In this embodiment, the second reflecting portion 8 is formed so as to reflect laser light with a wavelength of, for example, 1000 nm or more and transmit laser light with a wavelength of less than 1000 nm.
[0016] The light source 3 is optically connected to the second reflecting section 8 via the optical fiber rod 9, and is capable of emitting laser light (infrared light) having a wavelength of approximately 980 nm (for example, 976±2 nm) (hereinafter referred to as the "first wavelength") to the second reflecting section 8. The light source 3 may be a spatial output laser diode or a fiber output laser diode (single mode fiber output type or multimode fiber output type). The optical fiber rod 9 is a typical optical fiber rod whose core is not doped with a rare earth element.
[0017] The control device 10 includes a computer having a CPU, ROM, RAM, input / output interfaces, etc., various drive circuits, etc. The control device 10 controls the light source 3 based on the detected values of a temperature sensor (not shown) that detects the temperatures of the first and second heat exchange objects O1, O2 so that the first and second heat exchange objects O1, O2 are at desired temperatures.
[0018] Next, the operation of the heat cycle system 1 configured as above will be described.
[0019] In the heat cycle system 1, laser light of a first wavelength emitted from the light source 3 to the optical fiber rod 9 passes through the second reflector 8 and enters the first heat exchanger 4 provided at one end of the optical transmission line 2. The laser light of the first wavelength thus entered the optical transmission line 2 is absorbed by the first heat exchanger 4 at one end of the optical transmission line 2, and the first heat exchanger 4 generates (Stokes emission) laser light of a wavelength of approximately 1040 nm (hereinafter referred to as the "second wavelength") that is longer than (different from) the first wavelength, and releases heat to the first heat exchange object O1. Needless to say, the second wavelength can also have a certain width, just like the first wavelength.
[0020] More specifically, in the optical fiber rod 40 forming the first heat exchange section 4, ytterbium ions (Yb 3+) are excited by the laser light from the light source 3. Furthermore, when the excited ytterbium ions return to their ground state, the optical fiber rod 40 converts the wavelength of the laser light from the light source 3 to generate laser light of a second wavelength having lower energy than the laser light from the light source 3, as shown in FIG. 2, and also emits heat to the first heat exchange object O1 corresponding to the energy difference between the input light of the first wavelength and the output light of the second wavelength. This makes it possible to heat the first heat exchange object O1, i.e., the heating object, using the laser light of the first wavelength from the light source 3. Note that, by bringing the optical fiber rod 40 forming the first heat exchange unit 4 into contact with the first heat exchange object O1 or a heat transfer member, the excitation of the ytterbium ions by the laser light of the first wavelength in the first heat exchange unit 4 can be promoted.
[0021] Furthermore, the laser light of the second wavelength generated in the first heat exchanger 4 travels via the optical coupler 6 to the second heat exchanger 5 provided on the other end of the optical transmission line 2, and at least a portion of the laser light of the second wavelength is absorbed by the second heat exchanger 5. Accordingly, the second heat exchanger 5 generates (anti-Stokes emission) laser light of a first wavelength that is shorter than (different from) the second wavelength, and absorbs heat from the second heat exchange object O2.
[0022] More specifically, in the optical fiber rod 50 forming the second heat exchange unit 5, ytterbium ions doped in the core 51 are excited by the second-wavelength laser light from the first heat exchange unit 4. Furthermore, when the excited ytterbium ions return to their ground state, the optical fiber rod 50 converts the wavelength of the laser light from the first heat exchange unit 4 to generate a first-wavelength laser light having higher energy than the laser light from the first heat exchange unit 4, as shown in FIG. 3 , and absorbs heat from the second heat exchange object O2 corresponding to the energy difference between the input light of the second wavelength and the output light of the first wavelength. This makes it possible to cool the second heat exchange object O2, i.e., the object to be cooled, using the second-wavelength laser light from the first heat exchange unit 4. Incidentally, by bringing the optical fiber rod 50 forming the second heat exchange unit 5 into contact with the second heat exchange object O2 or a heat transfer member, the excitation of ytterbium ions by the second-wavelength laser light in the second heat exchange unit 5 can be promoted.
[0023] The second-wavelength laser light that has passed through the second heat exchanger 5 and the first-wavelength laser light generated in the second heat exchanger 5 are reflected by the first reflector 7 at the other end of the optical transmission path 2 toward one end of the optical transmission path 2 (the second reflector 8 side), and the first and second-wavelength laser light reflected by the first reflector 7 travel from the second heat exchanger 5 to the first heat exchanger 4. At least a portion of the second-wavelength laser light reflected by the first reflector 7 is absorbed by the second heat exchanger 5, and the second heat exchanger 5 generates the first-wavelength laser light (anti-Stokes emission) and absorbs heat from the second heat exchange object O2. This makes it possible to cool the second heat exchange object O2 using the second-wavelength laser light reflected by the first reflector 7.
[0024] Furthermore, the first-wavelength laser light generated in the second heat exchange unit 5 travels from the second heat exchange unit 5 to the first heat exchange unit 4 and is absorbed by the first heat exchange unit 4, causing the first heat exchange unit 4 to generate second-wavelength laser light (Stokes emission) and release heat. This makes it possible to heat the first heat exchange object O1 using the first-wavelength laser light generated in the second heat exchange unit 5. The second-wavelength laser light reflected by the first reflecting unit 7 and passing through the second and first heat exchange units 4, 5, and the second-wavelength laser light generated in the first heat exchange unit 4 are reflected by the second reflecting unit 8 at one end of the optical transmission line 2 to the other end side (first reflecting unit 7 side) of the optical transmission line 2 and travel to the first and second heat exchange units 4, 5. As a result, the light intensity distribution of the laser light of the first and second wavelengths in the optical transmission line 2 (in the cores 41, 51 and claddings 42, 52) including the optical fiber rods 40 and 50 is balanced in the manner exemplified in FIG.
[0025] As described above, in the heat cycle system 1, the laser light (light) from the light source 3 travels back and forth between the first reflecting unit 7 and the second reflecting unit 8, allowing the first heat exchange unit 4 to efficiently release heat to the first heat exchange object O1 and the second heat exchange unit 5 to efficiently absorb heat from the second heat exchange object O2. Furthermore, after the light source 3 starts operating, if the laser light is incident on the optical transmission path 2 from the light source 3 so as to compensate for the difference or loss between the energy released by the first heat exchange unit 4 and the energy absorbed by the second heat exchange unit 5, heat can be stably released or absorbed in the first and second heat exchange units 4 and 5. Furthermore, the heat cycle system 1, which travels the laser light from the light source 3 back and forth between the first reflecting unit 7 and the second reflecting unit 8, does not require an optical isolator that allows the laser light to pass only in one direction, thereby reducing costs. As a result, the heat cycle system 1 allows the laser light from the light source 3 to efficiently release and absorb heat while reducing costs.
[0026] In the heat cycle system 1, the first reflecting unit 7 is formed to reflect laser light with a wavelength of, for example, 900 nm or more, and reflects the laser light with the first wavelength and the laser light with the second wavelength to one end side (the second reflecting unit 8 side) of the optical transmission path 2. In contrast, the second reflecting unit 8 is formed to reflect laser light with a wavelength of, for example, 1000 nm or more and transmit laser light with a wavelength of less than 1000 nm, and reflects the laser light with the second wavelength to the other end side (the first reflecting unit 7 side) of the optical transmission path 2. This makes it possible to transmit the laser light from the light source 3 back and forth between the first reflecting unit 7 and the second reflecting unit 8 while suppressing loss.
[0027] Furthermore, in the heat cycle system 1, the first and second heat exchange units 4 and 5 are formed by optical fiber rods 40 and 50, respectively, including cores 41 and 51 doped with ytterbium. In the heat cycle system 1, the amount of ytterbium doped in the second heat exchange unit 5, i.e., the core 51 of the optical fiber rod 50, is set to be greater than the amount of ytterbium doped in the first heat exchange unit 4, i.e., the core 41 of the optical fiber rod 40. This makes it possible to satisfactorily ensure the amount of laser light of the first or second wavelength absorbed in the first and second heat exchange units 4 and 5, i.e., the amount of heat emitted in the first heat exchange unit 4 and the amount of heat absorbed in the second heat exchange unit 5. According to research by the inventors, it has been found that when the cores 41, 51 of the optical fiber rods 40, 50 contain silica and the amount of ytterbium doping in the core 41 of the optical fiber rod 40 forming the first heat exchange section 4 is, for example, 0.1% by weight, the amount of ytterbium doping in the core 51 of the optical fiber rod 50 forming the second heat exchange section 5 should be 0.2% by weight or more, more preferably 1% by weight or more, and may be around 2.5-3% by weight, or should be 10% by weight or less.
[0028] Furthermore, when the core 51 of the optical fiber rod 50 forming the second heat exchange section 5 contains silica doped with ytterbium, as described above, it is preferable to dope the core 51 with approximately the same amount of aluminum as the amount of ytterbium. This makes it possible to effectively suppress the occurrence of defects such as color centers that accompany doping with a large amount of ytterbium, while also ensuring an extremely good amount of heat absorption in the second heat exchange section 5.
[0029] However, the core 51 of the optical fiber rod 50 forming the second heat exchange section 5 may be a fluoride core containing fluoride doped with ytterbium but not doped with aluminum. Such an optical fiber rod 50 also makes it possible to ensure an extremely good amount of heat absorption in the second heat exchange section 5. According to research by the present inventors, when the core 51 contains fluoride, it has been found that the amount of ytterbium doped in the core 51 should be 1 wt % or more, or approximately 3 wt %, or 10 wt % or less.
[0030] Furthermore, in the heat cycle system 1, the light source 3 may emit laser light having a wavelength of approximately 1040 nm (second wavelength), and heat may be absorbed in the first heat exchange unit 4 and released in the second heat exchange unit 5. That is, the first heat exchange unit 4 may absorb the laser light of the second wavelength from the light source 3 side and generate laser light of a first wavelength that is shorter than the second wavelength (different from the second wavelength) (anti-Stokes emission) and absorb heat from the first heat exchange object O1, and the second heat exchange unit 5 may absorb the laser light of the first wavelength generated in the first heat exchange unit 4 and generate laser light of the second wavelength (Stokes emission) and release heat to the second heat exchange object O2. In this case, the amount of ytterbium doped in the first heat exchanger 4 should be set to be greater than the amount of ytterbium doped in the second heat exchanger 5, and the second reflector 8 should be formed to transmit the laser light of the second wavelength and to reflect the laser light of the first wavelength to the other end side (first reflector 7 side) of the optical transmission line 2. Even in this embodiment, it is possible to efficiently use the laser light from the light source 3 to release and absorb heat while suppressing an increase in costs.
[0031] Furthermore, the connection mode of the light source 3 to the optical transmission line 2 is not limited to the above. That is, the light source 3 may be connected to the optical transmission line 2 so that the laser light of the first or second wavelength is reflected by the second reflecting section 8 and enters the first heat exchanger 4. In this case, the second reflecting section 8 may be formed so as to reflect the laser light of the first wavelength and the laser light of the second wavelength to the other end side (first reflecting section 7 side) of the optical transmission line 2. Furthermore, the optical fiber rods 40, 50 may have cores 41, 51 doped with a rare earth element other than ytterbium. Furthermore, the optical transmission line 2 including the first and second heat exchangers 4, 5 may be formed by a single optical fiber rod.
[0032] 5 is a schematic diagram showing another heat cycle system 1B of the present disclosure. Among the components of the heat cycle system 1B, the same components as those of the above-described heat cycle system 1 are designated by the same reference numerals, and redundant explanations will be omitted.
[0033] The heat cycle system 1B shown in FIG. 5 includes a light source 3, a control device 10, and an optical transmission path 2B with ends. The optical transmission path 2B includes first and second heat exchange units 4B and 5B, a first reflecting unit 7B, and a second reflecting unit 8B. The first and second heat exchange units 4B and 5B of the optical transmission path 2B are each formed of a relatively small-diameter optical fiber 400 or 500 having a core containing ytterbium-doped silica (silica core). The optical fiber 400 or 500 may be a single-mode optical fiber or a multimode optical fiber. In the example shown in FIG. 5, the optical fiber 400 or 500 is wound spirally (coiled) multiple times and is wound around the first or second heat exchange object O1 or O2 so as to contact (closely contact) at least a portion of the first or second heat exchange object O1 or O2.
[0034] The core of the optical fiber 400 forming the first heat exchange unit 4 is doped with, for example, 0.1% by weight of ytterbium, and the core of the optical fiber 500 forming the second heat exchange unit 5 is doped with, for example, 0.2% by weight or more, more preferably 1% by weight or more and 10% by weight or less of ytterbium, which is more than the doping amount in the core of the optical fiber 400, and is also doped with approximately the same amount of aluminum as the ytterbium. However, the optical fiber 500 may also be a ZBLAN fiber having a core (fluoride core) containing fluoride that is doped with 1% by weight or more and 10% by weight or less of ytterbium and is not doped with aluminum.
[0035] The optical fiber 400 forming the first heat exchange unit 4 and the optical fiber 500 forming the second heat exchange unit 5 are optically connected via an optical fiber 600 fused to both. The optical fiber 600 is a general optical fiber whose core is not doped with a rare earth element. However, the optical fiber 600 may be omitted, and the optical fiber 400 forming the first heat exchange unit 4 and the optical fiber 500 forming the second heat exchange unit 5 may be fused directly to each other. The first reflecting unit 7B is a fiber Bragg grating fused to the end (the other end of the optical transmission line 2B) of the optical fiber 500 (second heat exchange unit 5) opposite to the optical fiber 600 side, and is formed to reflect, for example, laser light with a wavelength of 900 nm or more. The second reflecting section 8B is a fiber Bragg grating fused to the end (one end of the optical transmission line 2B) of the optical fiber 400 (first heat exchanger 4) opposite to the optical fiber 600 side, and is formed to reflect, for example, laser light with a wavelength of 1000 nm or more and transmit laser light with a wavelength of less than 1000 nm. The light source 3 is optically connected to the second reflecting section 8B via a general optical fiber 9B whose core is not doped with a rare earth element.
[0036] The heat cycle system 1B described above can achieve the same effects as the heat cycle system 1, efficiently utilizing the laser light from the light source 3 to release and absorb heat while suppressing cost increases. In the heat cycle system 1B, the light source 3 may emit laser light having a wavelength of approximately 1040 nm (second wavelength). The first heat exchanger 4B may absorb the second-wavelength laser light from the light source 3 and generate a first-wavelength laser light (anti-Stokes emission) that is shorter than the second wavelength (different from the second wavelength) while absorbing heat from the first heat exchange object O1. The second heat exchanger 5B may absorb the first-wavelength laser light generated by the first heat exchanger 4B and generate a second-wavelength laser light (Stokes emission) while releasing heat to the second heat exchange object O2. In this case, the amount of ytterbium doped in the first heat exchanger 4B may be greater than the amount of ytterbium doped in the second heat exchanger 5B, and the second reflector 8B may be formed to transmit the laser light of the second wavelength and reflect the laser light of the first wavelength to the other end side (the first reflector 7B side) of the optical transmission line 2B. Even in this embodiment, it is possible to efficiently use the laser light from the light source 3 to release and absorb heat while suppressing an increase in costs.
[0037] Furthermore, the connection mode of the light source 3 to the optical transmission line 2B is not limited to that shown in FIG. 5. That is, the light source 3 may be connected to the optical transmission line 2B so that the laser light of the first or second wavelength is reflected by the second reflecting unit 8B and enters the first heat exchanger 4B. In this case, the second reflecting unit 8B may be formed so as to reflect the laser light of the first wavelength and the laser light of the second wavelength to the other end side (first reflecting unit 7B side) of the optical transmission line 2. Furthermore, the optical fibers 400 and 500 may have cores doped with a rare earth element other than ytterbium. Furthermore, the optical transmission line 2B including the first and second heat exchangers 4B and 5B may be formed by a single optical fiber.
[0038] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present disclosure. Furthermore, the above-described embodiment is merely a specific form of the invention described in the Summary of the Invention, and does not limit the elements of the invention described in the Summary of the Invention. [Industrial Applicability]
[0039] The invention of the present disclosure can be used in the heat cycle system manufacturing industry, etc. [Explanation of symbols]
[0040] 1, 1B heat cycle system, 2, 2B optical transmission path, 3 light source, 4, 4B first heat exchange section, 5, 5B second heat exchange section, 7, 7B first reflecting section, 8, 8B second reflecting section, 40, 50 optical fiber rod, 41, 51 core, 42, 52 clad, 400, 500 optical fiber.
Claims
1. A heat cycle system that uses light to absorb or release heat, an optical transmission line extending from one end to the other end; a light source that inputs light of a first wavelength to the one end of the optical transmission line; a first heat exchanger provided on the one end side of the optical transmission line, absorbing light of the first wavelength to generate light of a second wavelength different from the first wavelength, and emitting or absorbing heat; a second heat exchanger provided on the other end of the optical transmission line, absorbing light of the second wavelength to generate light of the first wavelength and absorbing or emitting heat; a first reflecting section that reflects light from the second heat exchange section toward the one end at the other end of the optical transmission path; a second reflecting section at the one end of the optical transmission path that reflects light from the first heat exchange section toward the other end; A heat cycle system comprising:
2. The heat cycle system according to claim 1, a first reflecting section that reflects the light of the first wavelength and the light of the second wavelength toward the one end, and a second reflecting section that reflects the light of the second wavelength or the first wavelength toward the other end.
3. 3. The heat cycle system according to claim 1, the first wavelength is shorter than the second wavelength; the first heat exchanger absorbs light of the first wavelength to generate light of the second wavelength and release heat; the second heat exchanger absorbs the light of the second wavelength to generate the light of the first wavelength and absorbs heat; the first and second heat exchange sections each include an ytterbium-doped core; A heat cycle system in which the doping amount of ytterbium in the second heat exchange section is greater than the doping amount of ytterbium in the first heat exchange section.
4. The heat cycle system according to claim 3, The core of the second heat exchanger includes silica doped with ytterbium and aluminum or fluoride doped with ytterbium.
Citation Information
Patent Citations
Heat cycle system using light
JP2023087939A