Heat absorption / radiation system

Abstract

To successfully secure a heat radiation amount obtained by applying pressure to a solid heating medium including a phase transition material and a heat absorption amount obtained by releasing pressure from the solid heating medium.SOLUTION: A heat absorption / radiation system includes: a solid heating medium including a phase transition material; a pressurization member that applies pressure to one end in a pressurization direction of the solid heating medium; a support member that supports the other end in the pressurization direction of the solid heating medium; and a cylindrical member that supports an outer peripheral surface of the solid heating medium contracting in the pressurization direction and expanding in a radial direction orthogonal to the pressurization direction in accordance with the application of pressure from the pressurization member and is disposed so as not to abut on the pressurization member and the support member when pressure is applied from the pressurization member to the solid heating medium.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a heat absorption / dissipation system that uses a solid heat medium containing a phase change material that undergoes a phase change when pressurized. [Background technology]

[0002] Conventionally, rubidium-manganese-iron cyano complex (RbxMn[Fe(CN)6]y) has been known as a phase transition material having bistability (see, for example, Patent Document 1). The rubidium-manganese-iron cyano complex exhibits bistability in two states: a high-temperature phase in which the valences of manganese and iron are Mn(II)-Fe(III), and a low-temperature phase in which the valences of manganese and iron are Mn(III)-Fe(II). When pressure is applied to a heat medium containing such a rubidium-manganese-iron cyano complex, the phase transition temperature from the high-temperature phase to the low-temperature phase and the phase transition temperature from the low-temperature phase to the high-temperature phase increase. That is, when pressure is applied to the heat medium, the phase transition temperature from the high-temperature phase to the low-temperature phase, which is lower than the phase transition temperature from the low-temperature phase to the high-temperature phase, increases, so that the rubidium-manganese-iron cyano complex can undergo a phase transition from the high-temperature phase to the low-temperature phase, and heat can be released from the heat medium, without significantly lowering the temperature of the heat medium. In addition, when the pressure applied to the heat medium containing the rubidium-manganese-iron cyano complex is released, the phase transition temperature from the high-temperature phase to the low-temperature phase and the phase transition temperature from the low-temperature phase to the high-temperature phase decrease. Therefore, by releasing the pressure applied to the heat medium, it is possible to cause the rubidium-manganese-iron cyano complex to undergo a phase transition from a low-temperature phase to a high-temperature phase and to cause the heat medium to absorb heat, without significantly increasing the temperature of the heat medium. By repeatedly applying and releasing pressure to the heat medium, heat can be transferred from a low-temperature portion to a high-temperature portion via the heat medium. Furthermore, Patent Document 1 discloses a heat absorption and dissipation system including a solid heat medium obtained by solidifying a powder of the rubidium-manganese-iron cyano complex and a pressurizing device for pressurizing the solid heat medium. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 002698 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is difficult to obtain the theoretically expected amount of heat release (amount of temperature increase of the solid heat medium) by simply applying pressure to a solid heat medium containing a phase transition material as described in Patent Document 1. Furthermore, if the amount of heat release obtained by applying pressure to the solid heat medium is reduced, the amount of heat absorption of the solid heat medium (amount of temperature decrease of the solid heat medium) also falls below the theoretical value.

[0005] Therefore, a main objective of the present disclosure is to satisfactorily ensure the amount of heat dissipation obtained by applying pressure to a solid heat medium containing a phase change material, and the amount of heat absorption obtained by releasing pressure from the solid heat medium. [Means for solving the problem]

[0006] The heat absorption and dissipation system disclosed herein is a heat absorption and dissipation system that applies pressure to a phase change material that undergoes a phase change in response to pressure, causing a phase transition from a high-temperature phase to a low-temperature phase, and releases the pressure applied to the phase change material, causing a phase transition from the low-temperature phase to the high-temperature phase, and includes a solid heat medium containing the phase change material, a pressure member that applies pressure to one end of the solid heat medium in a pressure direction, a support member that supports the other end of the solid heat medium in the pressure direction, and a tubular member that supports the outer peripheral surface of the solid heat medium, which contracts in the pressure direction in response to the application of pressure from the pressure member and expands in a radial direction perpendicular to the pressure direction, and is positioned so as not to abut against the pressure member and the support member when pressure is applied to the solid heat medium from the pressure member.

[0007] In the heat absorption and dissipation system of the present disclosure, when pressure is applied from the pressurizing member to one end of the solid heat medium containing the phase transition material, the cylindrical member supports the outer circumferential surface of the solid heat medium, which expands in a radial direction perpendicular to the pressure direction in response to the application of pressure from the pressurizing member, and is substantially integrated with the solid heat medium. Furthermore, when pressure is applied from the pressurizing member to the solid heat medium, the cylindrical member is maintained in a state of not abutting against the pressurizing member and the support member. This makes it possible to prevent the pressure applied from the pressurizing member to one end of the solid heat medium from being transmitted to the support member via the outer circumferential surface of the solid heat medium and the cylindrical member supporting the outer circumferential surface, or the pressure being applied from the pressurizing member to the outer circumferential surface of the solid heat medium via the cylindrical member. Therefore, it is possible to transmit the load evenly to the entire solid heat medium in the pressure direction from both the pressurizing member and the support member. Furthermore, it is possible to suppress the part of the solid heat medium close to the pressurizing member from adhering to the inner circumferential surface of the cylindrical member, and to allow the air present in the solid heat medium to escape to the outside from the end of the cylindrical member on the support member side. As a result, the heat absorption and dissipation system of the present disclosure makes it possible to properly apply pressure to a solid heat medium containing a phase change material to effectively ensure the amount of heat dissipated from the solid heat medium due to the phase transition of the phase change material from a high-temperature phase to a low-temperature phase, and to effectively ensure the amount of heat absorbed by releasing pressure from the solid heat medium. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing a heat absorption and dissipation system according to the present disclosure. [Diagram 2] FIG. 2 is a schematic diagram for explaining a procedure for pressurizing a solid heat medium in the heat absorption and release system of the present disclosure. [Diagram 3] FIG. 2 is a schematic diagram for explaining a procedure for pressurizing a solid heat medium in the heat absorption and release system of the present disclosure. [Figure 4] FIG. 2 is a schematic diagram for explaining a procedure for pressurizing a solid heat medium in the heat absorption and release system of the present disclosure. [Diagram 5] 11 is a chart showing the evaluation results of the amount of heat absorption obtained by releasing pressure applied to a solid heat medium in the heat absorption and dissipation system of the present disclosure. [Figure 6]11 is a table showing the evaluation results of the amount of heat absorption obtained by releasing the pressure applied to the solid heat medium in the heat absorption and dissipation system of the comparative example. [Figure 7] FIG. 13 is a schematic configuration diagram showing another heat absorption and dissipation system of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Next, an embodiment of the present disclosure will be described with reference to the drawings.

[0010] FIG. 1 is a schematic diagram showing a heat absorption and dissipation system 1 of the present disclosure. The heat absorption and dissipation system 1 shown in the figure includes an upper punch 2 as a pressing member, a lower punch 3 as a supporting member, a die set 4 as a cylindrical member, a first jig 5, a plurality of (two in this embodiment) second jigs 6, and a solid heat medium 10. The upper punch 2 has a cylindrical pressing part 2p and is connected to a pressing source (driving device) not shown. The lower punch 3 has a cylindrical pedestal part 3b and a cylindrical support part 3s coaxially extended from the pedestal part 3b. The support part 3s is smaller than the pedestal part 3b and has the same outer diameter as the pressing part 2p of the upper punch 2. The pedestal part 3b of the lower punch 3 is fixed on a flat base part B provided in the installation space of the heat absorption and dissipation system 1 so that the support part 3s is located on the upper side in FIG. 1 and extends coaxially with the pressing part 2p of the upper punch 2.

[0011] The die set 4 has a cylindrical tubular portion 4a and an annular flange portion 4f extending radially outward from one end (the lower end in FIG. 1) of the tubular portion 4a. The tubular portion 4a of the die set 4 has an inner diameter slightly larger than the outer diameter of the pressing portion 2p of the upper punch 2 and the support portion 3s of the lower punch 3, and the support portion 3s of the lower punch 3 is slidably inserted into the inside of one end of the tubular portion 4a. The pressing portion 2p of the upper punch 2 is slidably inserted into the inside of the other end of the tubular portion 4a. As a result, the die set 4 (tubular portion 4a) is aligned by the upper punch 2 and the lower punch 3 so as to extend coaxially with the pressing portion 2p and the support portion 3s. Furthermore, a lubricant L, such as silicone oil or grease, is applied to the inner peripheral surface of the tubular portion 4a of the die set 4.

[0012] The first jig 5 includes a first cylindrical portion 5a and a second cylindrical portion 5b. The first cylindrical portion 5a has an inner diameter slightly larger than the outer diameter of the pedestal portion 3b of the lower punch 3 and a height equal to or slightly smaller than the height of the pedestal portion 3b. The second cylindrical portion 5b has an inner diameter larger than the inner diameter of the first cylindrical portion 5a and slightly larger than the outer diameter of the flange portion 4f of the die set 4. The second cylindrical portion 5b is fixed to one end surface (the upper end surface in FIG. 1) of the first cylindrical portion 5a so as to be coaxial with the first cylindrical portion 5a. Each second jig 6 is formed of a plate material and includes a flat portion 6f having a predetermined constant thickness.

[0013] As shown in FIG. 1, the two second jigs 6 are arranged at intervals around the pedestal portion 3b of the lower punch 3 on the base portion B so that the flat portion 6f is close to the pedestal portion 3b of the lower punch 3 on the base portion B. The first jig 5 is placed on the two second jigs 6 on the base portion B so that the first cylindrical portion 5a surrounds the pedestal portion 3b of the lower punch 3. That is, the lower end surface of the first jig 5 (first cylindrical portion 5a) in FIG. 1 is supported by the two second jigs 6. The flange portion 4f of the die set 4 is placed in the opening of the second cylindrical portion 5b of the first jig 5. That is, the end surface of the flange portion 4f of the die set 4 (the lower surface in FIG. 1) is supported by the end surface of the first cylindrical portion 5a exposed from the opening of the second cylindrical portion 5b (the upper end surface in FIG. 1). Furthermore, the outer peripheral surface of the flange portion 4f is supported so as to be slidable in the axial direction (the vertical direction in FIG. 1) by the inner peripheral surface of the second cylindrical portion 5b of the first jig 5. The heat absorption and dissipation system 1 may include a single second jig 6 capable of stably supporting the first jig 5, or may include three or more second jigs 6.

[0014] The solid heat medium 10 is a rubidium-manganese-iron cyanide complex (Rb x Mn[Fe(CN)6] y(hereinafter referred to as "RbMnFe complex"). The RbMnFe complex, which is an insoluble powder, is pressed and solidified to form a substantially cylindrical shape having an outer diameter (for example, about 10 mm) slightly smaller than the outer diameter of the pressurizing part 2p and the support part 3s and the inner diameter of the cylindrical part 4a of the die set 4. The solid heat transfer medium 10 is disposed in the cylindrical part 4a of the die set 4 so as to be located between the pressurizing part 2p of the upper punch 2 and the support part 3s of the lower punch 3. In addition, a seat plate 7 is disposed between the pressurizing part 2p of the upper punch 2 and the solid heat transfer medium 10, and between the support part 3s of the lower punch 3 and the solid heat transfer medium 10. As a result, when the upper punch 2 is moved by the pressure source in the pressure direction of the solid heat transfer medium 10, i.e., in the direction toward the lower punch 3, pressure is applied from the upper punch 2 to one end of the solid heat transfer medium 10 in the pressure direction (upper end in FIG. 1 ) and the other end of the solid heat transfer medium 10 in the pressure direction (lower end in FIG. 1 ) is supported by the lower punch 3, making it possible to pressurize the solid heat transfer medium 10 (RbMnFe complex).

[0015] The RbMnFe complex of the solid heat transfer medium 10 is a charge-transfer type phase transition complex having a network structure in which iron and manganese are three-dimensionally cross-linked by cyano groups, and a crystal structure in which rubidium ions are arranged alternately in the voids of the skeleton. Such an RbMnFe complex exhibits bistability in two states: a high-temperature phase in which the valences of manganese and iron are Mn(II)-Fe(III), and a low-temperature phase in which the valences of manganese and iron are Mn(III)-Fe(II). That is, the RbMnFe complex has a first phase transition temperature T LH When heated to above the first phase transition temperature T LH The second phase transition temperature T HL Below this temperature, a phase transition occurs from the high-temperature phase to the low-temperature phase, releasing heat.

[0016] In addition, the phase transition of the RbMnFe complex is accompanied by thermal hysteresis, and after the RbMnFe complex undergoes a phase transition from the low-temperature phase to the high-temperature phase, it stores the heat absorbed during the phase transition to the high-temperature phase until it transitions back to the low-temperature phase. Furthermore, by changing the ratio of rubidium to manganese in the RbMnFe complex, the two phase transition temperatures T LH ,T HL and the phase transition temperature T LH and the phase transition temperature T HL In the RbMnFe complex forming the solid heat transfer medium 10 of the present embodiment, the ratio x of rubidium to manganese is set to 0.94≦x≦1. This causes the phase transition temperature T LH and the phase transition temperature T HL and the phase transition temperature T LH ,T HL The rate of change of magnetic susceptibility (gradient of change) in the vicinity can be made larger.

[0017] Furthermore, when the RbMnFe complex is pressurized, the phase transition temperature from the high-temperature phase to the low-temperature phase, T HL and the phase transition temperature T from the low-temperature phase to the high-temperature phase LH Basically, the higher the pressure applied to the RbMnFe complex, the higher the phase transition temperatures T HL ,T LH Therefore, if a relatively high pressure is applied to the solid heat transfer medium 10 by moving the upper punch 2 toward the lower punch 3 using a pressure source (not shown), the phase transition temperature T LH The phase transition temperature T from the high-temperature phase to the low-temperature phase is lower than HL becomes higher, it becomes possible to cause a phase transition of the RbMnFe complex from a high-temperature phase to a low-temperature phase without significantly lowering the temperature of the solid heat transfer medium 10. As a result, in the heat absorption and release system 1, by applying pressure to the solid heat transfer medium 10 with the upper punch 2, heat can be released from the solid heat transfer medium 10 to a heat target (not shown) in response to the phase transition of the RbMnFe complex from the high-temperature phase to the low-temperature phase, thereby heating the heat target.

[0018] In contrast, when the pressure applied to the RbMnFe complex is released, the phase transition temperature from the high-temperature phase to the low-temperature phase, T HL and the phase transition temperature T from the low-temperature phase to the high-temperature phase LH decreases (returns to original state). Therefore, by releasing the pressure applied to the solid heat medium 10 (reducing the applied pressure to zero), it becomes possible to cause the phase transition of the RbMnFe complex from the low-temperature phase to the high-temperature phase without significantly increasing the temperature of the solid heat medium 10. As a result, in the heat absorption and dissipation system 1, by releasing the pressure applied to the solid heat medium 10, the solid heat medium 10 can absorb heat from a cooling target (not shown) in accordance with the phase transition of the RbMnFe complex from the low-temperature phase to the high-temperature phase, thereby cooling the cooling target.

[0019] In addition, by doping the Fe in the RbMnFe complex with trivalent cobalt ions, more specifically, hexacyanocobalt ions, the phase transition temperature T LH For example, if the amount of cobalt doped in the RbMnFe complex is 0 to 7%, the phase transition temperature T HL is set to a value in the range of 248K to 307K, and if it is 2 to 7%, the phase transition temperature T HL can be set to a value within the range of 248 K to 290 K. Furthermore, by doping the Mn (manganese) of the RbMnFe complex with divalent copper (Cu) ions, divalent nickel (Ni) ions, or divalent zinc (Zn) ions, the phase transition temperature T LH More specifically, the doping amount of divalent copper (Cu) ions relative to Mn in the RbMnFe complex is set to, for example, 6 to 8%, or the doping amount of divalent nickel (Ni) ions or divalent zinc (Zn) ions is set to, for example, 2 to 8%, thereby lowering the phase transition temperature T HL can be set to a value within a range of 250 K to 290 K. In addition, even if the Mn in the RbMnFe complex is doped with divalent iron (Fe) ions, if the doping amount is kept low (for example, 4% or less), the phase transition temperature T LH can be reduced.

[0020] On the other hand, when the Mn (manganese) of the RbMnFe complex is doped with divalent cobalt (Co) ions, the phase transition temperature T LH This makes it possible to realize a heat absorption / dissipation system that operates in a high-temperature environment by using divalent cobalt ions as a dopant for the RbMnFe complex. In addition, when zinc is used as a dopant for the RbMnFe complex, the phase transition temperature T LH and the phase transition temperature T HL By setting the doping amount to 4-8%, it is possible to reduce the difference (hysteresis width) between the phase transition temperature T LH and the phase transition temperature T HL The difference (hysteresis width) between the phase transition temperature T LH and the phase transition temperature T HL Therefore, an increase in the difference (hysteresis width) between the measured value and the actual value can be effectively suppressed.

[0021] Next, a procedure for pressurizing the solid heat medium 10 in the above-mentioned heat absorption and release system 1 will be described with reference to FIGS.

[0022] 1, in the heat absorption and dissipation system 1, before pressure is applied from the upper punch 2 to the solid heat transfer medium 10, the end face (lower face in FIG. 1) of the die set 4 on the lower punch 3 side is supported by a first jig 5 (first cylindrical portion 5a), and the end face (lower end face in FIG. 1) of the first cylindrical portion 5a of the first jig 5 opposite to the die set 4 side is supported by two second jigs 6. Furthermore, the solid heat transfer medium 10 is set in the cylindrical portion 4a of the die set 4 so as to be located between the pressure portion 2p of the upper punch 2 and the support portion 3s of the lower punch 3.

[0023] When the solid heat transfer medium 10 is set in the die set 4, the upper punch 2 is moved in the pressurizing direction, i.e., toward the lower punch 3, by a pressure source not shown, and the upper punch 2 applies a predetermined relatively low pressure (for example, 10-30 MPa, hereinafter referred to as "preload") to one end of the solid heat transfer medium 10 in the pressurizing direction. When a relatively low preload is applied from the upper punch 2 while the solid heat transfer medium 10 is supported by the lower punch 3, the solid heat transfer medium 10 contracts in the pressurizing direction (axial direction) and expands in the radial direction perpendicular to the pressurizing direction, as shown in FIG. 2, and the outer circumferential surface of the solid heat transfer medium 10 abuts against the inner circumferential surface of the die set 4 (cylindrical part 4a). As a result, the solid heat transfer medium 10 is supported by the die set 4, and the two are substantially integrated. The preload is determined through experiments and analyses so that the RbMnFe complex does not undergo a phase transition from a high-temperature phase to a low-temperature phase in relation to the ambient temperature, etc., and the outer circumferential surface of the solid heat transfer medium 10, which expands in the radial direction in response to the application of the preload, is supported by the die set 4. Furthermore, when a preload is applied to the solid heat transfer medium 10 , the die set 4 does not abut against either the upper punch 2 or the lower punch 3 .

[0024] 3, the two second jigs 6 are taken out (pulled out) from between the base B and the first jig 5 (first cylindrical portion 5a), and the first jig 5 moves (lowers) away from the end face (lower surface in the figure) of the die set 4 on the lower punch 3 side and is supported by the base B. On the other hand, since the outer peripheral surface of the solid heat transfer medium 10 expanded in the radial direction is supported by the cylindrical portion 4a, the die set 4 remains stationary without moving (lowers) to the base B side even if the first jig 5 moves (lowers) to the base B side. As a result, a clearance C equivalent to the thickness of the flat portion 6f of the second jig 6 is defined between the end face (end face on the lower punch 3 side) of the flange portion 4f of the die set 4 and the pedestal portion 3b (upper surface in the figure) of the lower punch 3.

[0025] In this embodiment, the thickness of the flat portion 6f of the second jig 6 is set to be larger (e.g., about 2.0-3.0 mm) than the maximum contraction amount (e.g., about 1.0-2.0 mm) in the pressure application direction (axial direction) of the solid heat transfer medium 10 according to the predetermined phase transition pressure (main pressure) applied from the upper punch 2 after the pre-pressure is applied to the solid heat transfer medium 10 and the volume of the solid heat transfer medium 10. Therefore, the clearance C is larger than the maximum contraction amount in the pressure application direction of the solid heat transfer medium 10 according to the phase transition pressure applied from the upper punch 2 and the volume of the solid heat transfer medium 10. In addition, after the two second jigs 6 are removed from between the base portion B and the first jig 5 (first cylindrical portion 5a), if the upper surface of the first cylindrical portion 5a of the first jig 5 in the figure is closer to the flange portion 4f (the lower end face in the figure) of the die set 4 in the pressure application direction than the upper surface of the base portion 3b of the lower punch 3 in the figure, the clearance between the end face (the end face on the lower punch 3 side) of the flange portion 4f of the die set 4 and the first cylindrical portion 5a (upper face in the figure) of the first jig 5 can be made larger than the maximum amount of contraction in the pressure application direction of the solid heat medium 10 according to the phase transition pressure applied from the upper punch 2.

[0026] After the two second jigs 6 are removed from between the base B and the first jig 5, the pressure source is controlled so that the phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10 for a predetermined time, as shown in FIG. 4. The phase transition pressure is determined through experiments and analyses to be equal to or higher than the phase transition temperature T HL ,T LHThe preload is set to a value (for example, about 500 MPa) sufficiently higher than the above preload so that the pressure falls within a desired range. This allows the RbMnFe complex to undergo a phase transition from a high-temperature phase to a low-temperature phase, and heat is released from the solid heat transfer medium 10 to a heating target (not shown), thereby heating the heating target. As shown in FIG. 4, when a phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10 so as to cause a phase transition from the high-temperature phase to the low-temperature phase of the RbMnFe complex, the die set 4 moves slightly toward the lower punch 3 (downward in the figure) together with the solid heat transfer medium 10, which contracts in the pressure application direction (axial direction). However, a sufficient clearance C is defined between the die set 4 and the lower punch 3 as described above. Therefore, the die set 4 is maintained in a state where it does not come into contact with the lower punch 3 while a relatively high phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10. 2 to 4, while the phase transition pressure is being applied to the solid heat transfer medium 10 from the upper punch 2, the upper end of the die set 4 in FIG.

[0027] When the phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10 for a predetermined time, the pressure applied from the upper punch 2 to the solid heat transfer medium 10 is released (returns to zero). This allows the RbMnFe complex to undergo a phase transition from a low-temperature phase to a high-temperature phase, and allows the solid heat transfer medium 10 to absorb heat from a cooling target (not shown), thereby cooling the cooling target. When the pressure applied from the upper punch 2 to the solid heat transfer medium 10 is released, the die set 4 moves slightly toward the upper punch 2 (upward in the figure) together with the solid heat transfer medium 10 expanding in the pressure application direction (axial direction). This ensures the above-mentioned clearance C between the die set 4 and the lower punch 3 again. In addition, when the pressure applied from the upper punch 2 to the solid heat transfer medium 10 is released, the upper end of the die set 4 does not come into contact with the upper punch 2. Therefore, in the heat absorption and dissipation system 1, it becomes possible to repeatedly apply and release pressure from the upper punch 2 to the solid heat transfer medium 10, and the characteristics of the RbMnFe complex can be effectively utilized to efficiently absorb and release heat.

[0028] As described above, in the heat absorption and dissipation system 1, when pressure is applied from the upper punch (pressure member) 2 to one end of the solid heat medium 10 containing the RbMnFe complex, the die set (cylindrical member) 4 supports the outer peripheral surface of the solid heat medium 10 which expands in a radial direction perpendicular to the pressure direction (axial direction) in response to the application of pressure (pre-pressure) from the upper punch 2, and becomes substantially integrated with the solid heat medium 10. Furthermore, when the pre-pressure and phase transition pressure are applied from the upper punch 2 to the solid heat medium 10 (see FIG. 4), the die set 4 is maintained in a state (floating state) where it does not come into contact with the upper punch 2 and the lower punch (support member) 3.

[0029] This prevents the pressure applied from the upper punch 2 to one end of the solid heat medium 10 from being transferred to the lower punch 3 via the outer peripheral surface of the solid heat medium 10 and the die set 4 supporting the outer peripheral surface, and prevents the pressure from being applied from the upper punch 2 to the outer peripheral surface of the solid heat medium 10 via the die set 4. The outer peripheral surface of the flange portion 4f is in sliding contact with the inner peripheral surface of the second cylindrical portion 5b, but does not abut against the second cylindrical portion 5b in the vertical direction in FIG. 4, etc., so that the force is not substantially transferred from the flange portion 4f to the second cylindrical portion 5b. Therefore, as shown in FIG. 4, it is possible to transfer the load evenly from both the upper punch 2 and the lower punch 3 to the entire solid heat medium 10 in the pressure direction. Furthermore, it is possible to prevent the portion of the solid heat medium 10 close to the upper punch 2 (only) from adhering to the inner peripheral surface of the die set 4 (cylindrical portion 4a), and to allow the air present in the solid heat medium 10 to escape to the outside from the end of the lower punch 3 of the die set 4. As a result, the heat absorption and dissipation system 1 can adequately secure the amount of heat dissipated from the solid heat medium 10 due to the phase transition of the RbMnFe complex from the high-temperature phase to the low-temperature phase by applying an appropriate pressure to the solid heat medium 10 containing the RbMnFe complex, and can also adequately secure the amount of heat absorbed by releasing the pressure from the solid heat medium 10.

[0030] FIG. 5 shows the evaluation result of the amount of heat absorption obtained by applying pressure to the solid heat medium 10 in the heat absorption and dissipation system 1 and then releasing the pressure from the solid heat medium 10. FIG. 6 shows the evaluation result of the amount of heat absorption obtained by applying pressure to the solid heat medium 10 and then releasing the pressure from the solid heat medium 10 in a heat absorption and dissipation system in which the application of the lubricant L to the die set 4 and the first and second jigs 5, 6 are omitted and the die set 4 is supported by the lower punch 3. Both FIG. 5 and FIG. 6 show the temperature change (see the solid line in the figure) of the center of the solid heat medium 10 (the center of the cross section in the central direction in the axial direction) when the phase transition pressure (for example, 500 MPa) is applied to the solid heat medium 10 for a predetermined time and then the pressure is released from the solid heat medium 10, as shown by the dotted line in the figure. Also, the dashed line in FIG. 5 and FIG. 6 shows the ambient temperature of the heat absorption and dissipation system 1, etc. Furthermore, the solid heat transfer medium 10 is formed by compressing and solidifying the powder of the RbMnFe complex inside a mold.

[0031] As shown in FIG. 5, the maximum temperature drop amount when the phase transition pressure is applied to the solid heat medium 10 in the heat absorption and dissipation system 1 and the pressure is released is about 9° C. In contrast, the maximum temperature drop amount when the phase transition pressure is applied to the solid heat medium 10 in the heat absorption and dissipation system in which the application of the lubricant L to the die set 4 and the first and second jigs 5 and 6 are omitted and the pressure is released is about 4° C. as shown in FIG. 6. From these evaluation results, it can be understood that the heat absorption and dissipation system 1 can obtain a heat dissipation amount (temperature increase amount of the solid heat medium 10) closer to the theoretical value by applying an appropriate pressure to the solid heat medium 10 containing the RbMnFe complex, and accordingly, a heat absorption amount (temperature drop amount of the solid heat medium 10) closer to the theoretical value can be obtained.

[0032] In the heat absorption and dissipation system 1, before the phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10 so as to cause a phase transition from the high-temperature phase to the low-temperature phase of the RbMnFe complex, a clearance C larger than the maximum contraction amount in the pressure application direction of the solid heat transfer medium 10 according to the phase transition pressure applied from the upper punch 2 is defined between the end face of the die set 4 (flange portion 4f) on the lower punch 3 side and the lower punch 3 (base portion 3b). This makes it possible to maintain the die set 4 in a state where it does not come into contact with the lower punch 3 (floating state) while a relatively high phase transition pressure is applied from the upper punch 2 to one end of the solid heat transfer medium 10.

[0033] Furthermore, the heat absorption and dissipation system 1 includes a first jig 5 arranged around the lower punch 3 so as to support an end face of the die set 4 (flange portion 4f) on the lower punch 3 side, and a second jig 6 having a thickness larger than the maximum amount of shrinkage of the solid heat medium 10 in the pressure direction and supporting an end face of the first jig 5 opposite to the die set 4 side. In the heat absorption and dissipation system 1, a relatively low preload is applied to the solid heat medium 10 from the upper punch 2 so that the outer circumferential surface of the solid heat medium 10 abuts against the inner circumferential surface of the die set 4, and the second jig 6 is removed so that the first jig 5 is separated from the end face of the die set 4 on the lower punch 3 side.

[0034] As a result, a clearance C larger than the maximum contraction amount in the pressure direction of the solid heat transfer medium 10 according to the phase transition pressure applied from the upper punch 2 is defined between the end face of the die set 4 on the lower punch 3 side and the lower punch 3 (base portion 3b). As a result, after the second jig 6 is removed, the phase transition temperature T HL ,T LH It becomes possible to apply a phase transition pressure that optimizes the phase transition temperature to the solid heat transfer medium 10 from the upper punch 2. In addition, the first and second jigs 5 and 6 allow the die set 4 to be precisely aligned with the upper punch 2 and the lower punch 3, and a clearance C can be defined between the die set 4 and the lower punch 3.

[0035] In addition, in the heat absorption and dissipation system 1, a lubricant L is applied to the inner peripheral surface of the die set 4. This reduces friction between the outer peripheral surface of the solid heat transfer medium 10 and the inner peripheral surface of the die set 4, so that the solid heat transfer medium 10 can be effectively prevented from adhering to the inner peripheral surface of the die set 4.

[0036] In addition, when the application and release of pressure from the upper punch 2 to the solid heat medium 10 is repeatedly performed in the heat absorption and dissipation system 1, the die set 4 may move (lower) toward the lower punch 3 in response to radial contraction of the solid heat medium 10. Therefore, the heat absorption and dissipation system 1 may be provided with a jig moving mechanism that moves the first jig 5 away from (raises) the base part B and inserts the second jig 6 between the first jig 5 and the base part B. In addition, the heat absorption and dissipation system 1 does not necessarily need to be arranged so that the pressure direction of the solid heat medium 10 extends in the up-down direction (vertical direction), and may be arranged so that the pressure direction of the solid heat medium 10 extends in the lateral direction (horizontal direction).

[0037] 7 is a schematic diagram showing another heat absorption and dissipation system 1B of the present disclosure. Among the components of the heat absorption and dissipation system 1B, the same components as those of the above-mentioned heat absorption and dissipation system 1 are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0038] In the heat absorption and dissipation system 1B shown in Fig. 7, the second jig 6 is omitted, and the end face of the first jig 5 opposite to the die set 4 side is supported by the base part B. The outer peripheral surface of the flange part 4f of the die set 4 is supported by the inner peripheral surface of the second cylindrical part 5b of the first jig 5 so as to be slidable in the axial direction (the up-down direction in Fig. 1). Furthermore, the heat absorption and dissipation system 1B includes a clamping mechanism 8 that selectively holds (clamps) or releases the tubular part 4a of the die set 4. The clamping mechanism 8 is capable of restricting the movement of the solid heat transfer medium 10 of the die set 4 in the pressure direction by holding the tubular part 4a.

[0039] In the heat absorption and dissipation system 1B, the die set 4 is held (fixed) by the clamp mechanism 8 (see FIG. 7) so that the cylindrical portion 4a extends coaxially with the pressure portion 2p of the upper punch 2 and the support portion 3s of the lower punch 3, and a clearance C is defined between the end face of the flange portion 4f (the end face on the lower punch 3 side) and the base portion 3b (the upper surface in the figure) of the lower punch 3, prior to the application of pressure from the upper punch 2 to the solid heat medium 10. In this case as well, the clearance C is set to be larger than the maximum contraction amount in the pressure direction (axial direction) of the solid heat medium 10 according to the phase transition pressure applied from the upper punch 2 after the preload is applied to the solid heat medium 10.

[0040] Next, the upper punch 2 is moved in the pressurizing direction, i.e., toward the lower punch 3, by a pressure source (not shown), and the upper punch 2 applies a relatively low preload (e.g., 10-30 MPa) to one end of the solid heat transfer medium 10 in the pressurizing direction. When the relatively low preload is applied from the upper punch 2 while the solid heat transfer medium 10 is supported by the lower punch 3, the solid heat transfer medium 10 contracts in the pressurizing direction (axial direction) and expands in the radial direction perpendicular to the pressurizing direction, as shown in Fig. 7, and the outer peripheral surface of the solid heat transfer medium 10 abuts against the inner peripheral surface of the die set 4 (cylindrical portion 4a). As a result, the solid heat transfer medium 10 is supported by the die set 4, and the two are substantially integrated.

[0041] After the preload is applied to the solid heat transfer medium 10, the clamp mechanism 8 releases the cylindrical portion 4a so that the die set 4 is allowed to move in the pressure direction. Furthermore, the pressure source is controlled so that a predetermined phase transition pressure (for example, about 500 MPa) is applied to the solid heat transfer medium 10 from the upper punch 2 for a predetermined time. This allows the RbMnFe complex to undergo a phase transition from a high-temperature phase to a low-temperature phase, and heat is released from the solid heat transfer medium 10 to a heat target (not shown), thereby heating the heat target. At this time, since a sufficient clearance C is defined between the die set 4 and the lower punch 3, even if the die set 4 moves slightly toward the lower punch 3 (downward in the figure) together with the solid heat transfer medium 10, which shrinks in the pressure direction (axial direction), it is maintained in a state where it does not abut against the lower punch 3. Also, in the heat absorption and dissipation system 1B, the upper end of the die set 4 in FIG. 7 does not abut against the upper punch 2 while pressure is applied to the solid heat transfer medium 10 from the upper punch 2.

[0042] When the phase transition pressure is applied from the upper punch 2 to the solid heat transfer medium 10 for a predetermined time, the pressure applied from the upper punch 2 to the solid heat transfer medium 10 is released (returns to zero). This allows the RbMnFe complex to undergo a phase transition from a low-temperature phase to a high-temperature phase, and allows the solid heat transfer medium 10 to absorb heat from a cooling target (not shown), thereby cooling the cooling target. At this time, the die set 4 moves slightly toward the upper punch 2 together with the solid heat transfer medium 10 expanding in the pressure application direction (axial direction), thereby ensuring the above-mentioned clearance C between the die set 4 and the lower punch 3 again. Furthermore, when the pressure applied from the upper punch 2 to the solid heat transfer medium 10 is released, the upper end of the die set 4 does not come into contact with the upper punch 2. Therefore, in the heat absorption and dissipation system 1B as well, it becomes possible to repeatedly apply and release pressure from the upper punch 2 to the solid heat transfer medium 10, and the characteristics of the RbMnFe complex can be effectively utilized to efficiently absorb and release heat.

[0043] Also, in the heat absorption and dissipation system 1B, when the application and release of pressure from the upper punch 2 to the solid heat medium 10 is repeatedly performed, the die set 4 may move (lower) toward the lower punch 3 in response to radial contraction of the solid heat medium 10. Therefore, the clamp mechanism 8 may be provided with a function of holding the die set 4 away (raised) from the lower punch 3. Furthermore, the heat absorption and dissipation system 1B does not necessarily need to be arranged so that the pressure direction of the solid heat medium 10 extends in the up-down direction (vertical direction), and may be arranged so that the pressure direction of the solid heat medium 10 extends in the lateral direction (horizontal direction).

[0044] The solid heat transfer medium 10 of the heat absorption and dissipation system 1, 1B may be added with at least one of grease containing at least a base oil component and a thickening component, and resin powder. The grease may be, for example, a silicon-based grease containing silicon oil as a base oil and silica powder as a thickening agent, a paraffin-based grease containing paraffin oil as a base oil and bentonite as a thickening agent, or a molybdenum disulfide-based grease containing an extreme pressure additive. The resin powder may be, for example, polypropylene powder or polytetrafluoroethylene powder that can be divided into particles at least equivalent to the particle diameter of the RbMnFe complex (for example, an average particle diameter of 5 μm or less).

[0045] In the solid heat transfer medium 10 to which grease is added, the lubricating action of the base oil component of the grease ensures good fluidity at the micro level of the RbMnFe complex powder when pressure is applied and released, and the action of the thickening component of the grease makes it possible to maintain the solid state (compressed powder state) of the solid heat transfer medium 10 even when pressure is repeatedly applied and released. As a result, it becomes possible to reduce the gaps between the RbMnFe complex powder particles when pressure is applied to the solid heat transfer medium 10, and the entire RbMnFe complex powder can be pressurized almost evenly, thereby ensuring a good amount of heat dissipation obtained by applying pressure to the solid heat transfer medium 10. Furthermore, when pressure is released from the solid heat transfer medium 10, the lubricating action of the grease makes it possible to smoothly return (expand or contract) the entire RbMnFe complex powder to the state before pressure was applied, so that the amount of heat absorption obtained by releasing pressure from the solid heat transfer medium 10 can be ensured. In addition, by adding grease to the solid heat transfer medium 10, it is also possible to suppress adhesion between the solid heat transfer medium 10 and the upper punch 2 that applies pressure to the solid heat transfer medium 10.

[0046] In addition, in the solid heat transfer medium 10 to which the resin powder is added, the gaps between the powder particles of the RbMnFe complex can be filled with the resin powder. This makes it possible to apply almost uniform pressure to the entire powder particles of the RbMnFe complex when pressure is applied to the solid heat transfer medium 10, and the amount of heat released from the solid heat transfer medium 10 can be secured well. Furthermore, by filling and reducing the gaps between the powder particles of the RbMnFe complex with the resin powder, when pressure is released from the solid heat transfer medium 10, the entire powder particles of the RbMnFe complex can be smoothly restored to the state before pressure was applied, and the amount of heat absorbed by the solid heat transfer medium 10 can be secured well. In addition, by adopting a resin powder having a low thermal conductivity, the resin powder can function as a heat insulating material for the solid heat transfer medium 10. This makes it possible to suppress the heat from the solid heat transfer medium 10 from being released before being transferred to the heating target, or the heat from the solid heat transfer medium 10 from being released at the same time as the heat absorption by the solid heat transfer medium 10, making it impossible to lower the temperature of the cooling target.

[0047] Furthermore, the phase transition material forming the solid heat medium 10 of the heat absorption and dissipation system 1, 1B is not limited to the RbMnFe complex. In other words, the phase transition material forming the solid heat medium 10 is not limited to the RbMnFe complex, but may be TiNi, BaTiO3, PbZr 0.95 Ti 0.05 The solid heat medium 10 may be an alloy containing Ti (elastic heat material) such as O3, or an organic resin containing hydrogen bonds (pressure heat material) such as neopentyl glycol (NPG), pentaerythritol (PE), or pentaglycerin (PE). Furthermore, the phase transition material forming the solid heat medium 10 may be Gd5Si2Ge2, La(Fe,Co,Si) 13 , MnCoGeB 0.02 The material may be an elastic calorific material such as PVDF-TrFE, Cu2ZnAl, or FeRh, or a pressure calorific material such as (NH4)SO4, AgI, rubber, AMP, TRIS, MNP, or NMP.

[0048] The present disclosure is not limited to the above embodiment, and various modifications can be made within the scope of the present disclosure. Furthermore, the above 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]

[0049] The present invention is applicable to the heat absorption and dissipation systems and the solid heat medium manufacturing industry, etc. [Explanation of symbols]

[0050] 1, 1B heat absorption and dissipation system, 2 upper punch (pressure member), 3 lower punch (support member), 4 die set (cylindrical member), 5 first jig, 6 second jig, 8 clamp mechanism, 10 solid heat transfer medium, C clearance, L lubricant.

Claims

1. A heat absorption and dissipation system that applies pressure to a phase-change material that undergoes a phase change when pressure is applied to cause a phase transition from a high-temperature phase to a low-temperature phase, and releases the pressure applied to the phase-change material to cause a phase transition from the low-temperature phase to the high-temperature phase, A solid heat transfer medium containing the phase change material; A pressure member that applies pressure to one end of the solid heat transfer medium in a pressure direction; A support member for supporting the other end of the solid heat transfer medium in the pressurizing direction; a cylindrical member that supports an outer peripheral surface of the solid heat medium, the solid heat medium contracting in the pressure direction and expanding in a radial direction perpendicular to the pressure direction in response to the application of pressure from the pressure member, and is arranged so as not to come into contact with the pressure member and the support member when pressure is applied from the pressure member to the solid heat medium; A heat absorption and dissipation system comprising:

2. The heat absorption and dissipation system according to claim 1, a pressure member that applies pressure to the solid heat medium from the pressure member to cause a phase transition from the high temperature phase to the low temperature phase of the phase transition material, the pressure member being configured to apply a pressure to the solid heat medium from the pressure member to the low temperature phase ...

3. The heat absorption and dissipation system according to claim 2, a first jig that is disposed around the support member so as to support the end surface of the cylindrical member on the support member side; The heat absorption and dissipation system further includes a second jig having a thickness greater than the maximum amount of shrinkage of the solid heat transfer medium in the pressure direction and supporting an end face of the first jig opposite to the cylindrical member side.

4. 4. The heat absorption / dissipation system according to claim 1, wherein a lubricant is applied to an inner peripheral surface of the cylindrical member.

Images