Discharge device, refrigerant evaluation device, and refrigerant evaluation method

Abstract

To determine the degree of an inhomogeneous reaction in a coolant.SOLUTION: A coolant evaluation device (100) includes a discharging device (20), a coolant chamber (70), a pressure sensor (74), and a calculation unit (30). The discharging device (20) includes a first electrode (71) and a second electrode (72), a capacitor (31), and a reactor part (40). The capacitor (31) applies a first voltage (V1) between the first electrode (71) and the second electrode (72) by accumulating energy (E). The reactor part (40) includes reactors (50, 60). The reactor part (40) generates a second voltage (V2) to be applied between the first electrode (71) and the second electrode (72) by induction, thereby starting the discharging of the energy (E) in the coolant (73) between the first electrode (71) and the second electrode (72).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a discharge device used to determine the likelihood of a disproportionation reaction occurring in a refrigerant, and further to a refrigerant evaluation device and a refrigerant evaluation method that use such a discharge device. [Background technology]

[0002] Non-Patent Document 1 (Japanese Industrial Standards (JIS) Z8834) discloses a method for determining minimum ignition energy of dust / air mixtures. This measurement method is used to determine whether a mixture of combustible dust and air is likely to be ignited by an electrical discharge. Summary of the Invention [Problem to be solved by the invention]

[0003] However, it is difficult to apply this measurement method to determine the likelihood of disproportionation reactions occurring in a refrigerant because discharge is unlikely to occur in an environment where high pressure is applied to the refrigerant.

[0004] Therefore, in order to determine the susceptibility of a certain type of refrigerant to a disproportionation reaction, in other words, to determine the extent to which a disproportionation reaction has already occurred in a sample refrigerant, a discharge device capable of generating a discharge in a high-pressure refrigerant is required. [Means for solving the problem]

[0005] A refrigerant evaluation device according to a first aspect includes a discharge device, a refrigerant chamber, a pressure sensor, and a calculation unit. The discharge device includes a first electrode and a second electrode, a capacitor, and a reactor unit. The first electrode and the second electrode are spaced apart from each other. The capacitor stores energy to apply a first voltage between the first electrode and the second electrode. The reactor unit has a reactor. The reactor unit generates a second voltage by induction to be applied between the first electrode and the second electrode, thereby initiating discharge of energy between the first electrode and the second electrode. The refrigerant chamber can accommodate a refrigerant in an internal space in which the first electrode and the second electrode are disposed. The pressure sensor acquires the pressure of the refrigerant. The calculation unit calculates the extent of the disproportionation reaction of the refrigerant based on an output from the pressure sensor. The second voltage induced in the reactor unit is applied to the first electrode and the second electrode, thereby initiating discharge of energy in the refrigerant.

[0006] According to this configuration, the discharge device can apply discharge energy to the refrigerant, and therefore the refrigerant evaluation device can stably determine the degree of the disproportionation reaction of the refrigerant.

[0007] A refrigerant evaluation device according to a second aspect is the refrigerant evaluation device according to the first aspect, wherein the reactor has a reactor core made of ferrite and a coil wound around the reactor core.

[0008] According to this configuration, the reactor core is made of ferrite, which makes it easy to increase the second voltage.

[0009] A refrigerant evaluation device according to a third aspect is the refrigerant evaluation device according to the second aspect, wherein the reactor core has a magnetic permeability of 250 H / m or more.

[0010] According to this configuration, the reactor core has a large magnetic permeability, which makes it easy to increase the second voltage.

[0011] A refrigerant evaluation device according to a fourth aspect is the refrigerant evaluation device according to the second or third aspect, wherein the number of turns of the coil is 20 or more and 100 or less.

[0012] In this configuration, the coil has a predetermined number of turns, and therefore, by cooperating with the ferrite core, the coil can generate a large second voltage.

[0013] A refrigerant evaluation device according to a fifth aspect is the refrigerant evaluation device according to any one of the second aspect to the fourth aspect, wherein the material of the coil is selected from copper and silver.

[0014] With this configuration, the resistivity of the material of the coil is low, which reduces energy loss.

[0015] A refrigerant evaluation device according to a sixth aspect is the refrigerant evaluation device according to any one of the second to fifth aspects, further including a discharge path through which energy is transferred during discharge. The discharge path includes a capacitor and a coil arranged in series. The discharge path does not include a semiconductor element.

[0016] According to this configuration, the discharge path does not include a semiconductor element, and therefore can handle a large current that exceeds the rated current of the semiconductor element, which is about several amperes, and can provide a large amount of energy to the refrigerant.

[0017] A seventh aspect of the refrigerant evaluation device is the refrigerant evaluation device of any one of the second aspect to the sixth aspect, wherein the reactor has an input coil wound around a reactor core.

[0018] According to this configuration, the second voltage can be induced by passing a current through the input coil.

[0019] A refrigerant evaluation device according to an eighth aspect is the refrigerant evaluation device according to any one of the first aspect to the seventh aspect, wherein the second voltage is not less than 20 kV and not more than 100 kV.

[0020] According to this configuration, the value of the second voltage is large, and therefore the discharge device can provide large discharge energy to the refrigerant, stabilizing the amount of energy received by the refrigerant.

[0021] A ninth aspect of the refrigerant evaluation device is the refrigerant evaluation device of any one of the first aspect to the eighth aspect, wherein the current flowing through the first electrode or the second electrode is 50 A or more.

[0022] According to this configuration, the value of the current involved in the discharge is large, and therefore the discharge device can provide large discharge energy to the refrigerant, so the amount of energy received by the refrigerant is stable.

[0023] A refrigerant evaluation device according to a tenth aspect is the refrigerant evaluation device according to any one of the first aspect to the ninth aspect, wherein the diameter of each of the first electrode and the second electrode is 3 mm or less.

[0024] With this configuration, the diameter of the electrodes is small, and therefore the volumes of the first electrode and the second electrode are small, so there is little risk that the thermal energy temporarily generated by the discharge will be cooled by the metal material forming the first electrode or the second electrode.

[0025] A refrigerant evaluation device according to an eleventh aspect is the refrigerant evaluation device according to any one of the first to tenth aspects, wherein the first electrode and the second electrode are spaced apart from each other by 10 μm or more.

[0026] With this configuration, the distance between the first electrode and the second electrode is kept large, and therefore the amount of discharge energy received by the refrigerant is stabilized.

[0027] A twelfth aspect of the refrigerant evaluation device is the refrigerant evaluation device of any one of the first aspect to the eleventh aspect, wherein the capacitance of the capacitor is 30 μF or more.

[0028] With this configuration, the capacitance of the capacitor is large, and therefore the discharge device can provide a large amount of discharge energy to the refrigerant, stabilizing the amount of energy received by the refrigerant. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a refrigerant evaluation device 100. DETAILED DESCRIPTION OF THE INVENTION

[0030] <Basic embodiment> (1) Overall structure 1 is a schematic diagram showing the configuration of a refrigerant evaluation device 100. The refrigerant evaluation device 100 is used to determine the likelihood of a disproportionation reaction occurring in a certain type of refrigerant, in other words, to determine the extent to which a disproportionation reaction has already occurred in a sample refrigerant. The refrigerant evaluation device 100 includes a refrigerant chamber 70, a charging device 10, a discharging device 20, and a computing unit 80.

[0031] (2) Detailed configuration (2-1) Refrigerant chamber 70 The coolant chamber 70 is a chamber having an internal space. The internal space can accommodate a high-pressure coolant 73. This coolant 73 is the sample to be measured.

[0032] A first electrode 71 and a second electrode 72 are provided in the internal space of the refrigerant chamber 70. The first electrode 71 and the second electrode 72 cooperate to generate a discharge in the refrigerant 73. The first electrode 71 and the second electrode 72 are arranged to be spaced apart from each other by a separation distance D. Each of the first electrode 71 and the second electrode 72 has a diameter φ.

[0033] A pressure sensor 74 for acquiring the pressure of the refrigerant 73 is disposed in the refrigerant chamber 70 .

[0034] (2-2)Charging device 10 The charging device 10 is for storing energy E to be given to the refrigerant 73 by discharging. The charging device 10 stores this energy E in a capacitor 31 of the discharging device 20, which will be described later.

[0035] The charging device 10 includes a DC power supply 11 , a resistor 12 , and a charging switch 13 .

[0036] The DC power supply 11 has a positive terminal 11a and a negative terminal 11b, and outputs a DC voltage V0 between the positive terminal 11a and the negative terminal 11b.

[0037] The resistor 12 is connected to at least one of the positive terminal 11a and the negative terminal 11b.

[0038] The charging switch 13 transmits or disconnects the DC voltage V0 output by the DC power supply 11 to or from the capacitor 31 of the discharge device 20. In this way, the charging switch 13 charges the capacitor 31. The charging switch 13 may be, for example, a switch or a relay, which is a mechanical switching element, or may be a semiconductor element such as a power transistor.

[0039] (2-3) Discharge device 20 The discharge device 20 generates a discharge between the first electrode 71 and the second electrode 72 , thereby providing energy E to the refrigerant 73 .

[0040] The discharge device 20 has an energy storage section 30 and a reactor section 40. The discharge device 20 does not have a semiconductor element.

[0041] The discharge device 20 has a discharge path DP. The discharge path DP extends from a node N1 connected to the second electrode 72, via nodes N2, N3, and N4, to a node N5 connected to the first electrode 71. The discharge path DP does not include a semiconductor element such as a power transistor.

[0042] (2-3-1) Energy storage unit 30 The energy storage unit 30 has a capacitor 31. The capacitor 31 has a first terminal 31a and a second terminal 31b. The first terminal 31a is connected to a node N3. The second terminal 31b is connected to a node N2. The energy storage unit 30 does not have a semiconductor element such as a power transistor.

[0043] The node N3 is connected to the positive terminal 11a of the DC power supply 11 via a resistor 12 and a charging switch 13. The node N2 is connected to the negative terminal 11b of the DC power supply 11.

[0044] The capacitor 31 has a capacitance C. When the charging switch 13 is closed, the capacitor 31 is charged. This causes the capacitor 31 to accumulate a charge Q. Even when the charging switch 13 is subsequently opened, the capacitor 31 maintains a first voltage V1 between the first terminal 31a and the second terminal 31b due to the action of the charge Q. At this time, the energy E stored in the capacitor 31 is expressed as E=(1 / 2)×C×(V1). 2 It is expressed by the formula:

[0045] When no discharge occurs in the coolant chamber 70, the first voltage V1 is applied to the first electrode 71 and the second electrode 72.

[0046] (2-3-2) Reactor section 40 The reactor unit 40 is used to initiate a discharge between the first electrode 71 and the second electrode 72. The reactor unit 40 generates a large second voltage V2 by induction. Even if the first voltage V1 is applied between the first electrode 71 and the second electrode 72, no current I flows between the first electrode 71 and the second electrode 72 while no discharge is occurring. In this state, when the large second voltage V2 generated by the reactor unit 40 is applied to the first electrode 71 and the second electrode 72, plasma is generated in the refrigerant 73, and conduction occurs between the first electrode 71 and the second electrode 72. Thereafter, the charge Q stored in the capacitor 31 moves between the first electrode 71 and the second electrode 72, causing a discharge in the refrigerant 73.

[0047] The reactor section 40 includes a first reactor 50 and a second reactor 60. The first reactor 50 and the second reactor 60 are connected in series.

[0048] The first reactor 50 includes a first reactor core 51, a first primary coil 54, a first secondary coil 53, a first charging capacitor 55, and a first discharge switch 56. The first reactor core 51 is made of ferrite. The first reactor core 51 has a magnetic permeability μ. The first primary coil 54 and the first secondary coil 53 are both wound around the first reactor core 51. The first secondary coil 53 has N turns. The first secondary coil 53 is made of a material selected from copper and silver. The first discharge switch 56 may be, for example, a switch or relay, which is a mechanical switching element, or a semiconductor element such as a power transistor.

[0049] The second reactor 60 includes a second reactor core 61, a second primary coil 64, a second secondary coil 63, a second charging capacitor 65, and a second discharge switch 66. The second reactor core 61 is made of ferrite. The second reactor core 61 has a magnetic permeability μ. The second primary coil 64 and the second secondary coil 63 are both wound around the second reactor core 61. The second secondary coil 63 has a number of turns N. The second secondary coil 63 is made of a material selected from copper and silver. The second discharge switch 66 may be, for example, a switch or relay, which is a mechanical switching element, or a semiconductor element such as a power transistor.

[0050] The first secondary coil 53 has one end connected to node N3 and the other end connected to node N4. The second secondary coil 63 has one end connected to node N4 and the other end connected to node N5. The reactor unit 40 does not include a semiconductor element such as a power transistor at least in the discharge path DP extending from node N3 to node N5.

[0051] The first charging capacitor 55 is charged by a charging circuit (not shown). The first discharging switch 56 discharges the charge stored in the first charging capacitor 55, causing a transient current to flow through the first primary coil 54. This transient current generates an induced voltage in the first secondary coil 53.

[0052] The second charging capacitor 65 is charged by a charging circuit (not shown). The second discharging switch 66 discharges the charge stored in the second charging capacitor 65, causing a transient current to flow through the second primary coil 64. This transient current generates an induced voltage in the second secondary coil 63.

[0053] The large second voltage V2 is generated by the induced voltages in the first secondary coil 53 and the second secondary coil 63.

[0054] (2-4) Calculation unit 80 The arithmetic unit 80 is a computer equipped with a central processing unit and a storage device. The arithmetic unit 80 calculates the degree of the disproportionation reaction of the refrigerant 73 based on at least the output of the pressure sensor 74.

[0055] The arithmetic unit 80 may further use the outputs of a voltmeter 81 and an ammeter 82 when calculating the degree of the disproportionation reaction of the refrigerant 73. The voltmeter 81 measures a third voltage V3, which is the potential difference between the first electrode 71 and the second electrode 72. The ammeter 82 measures the current I flowing through the first electrode 71 or the second electrode 72. The ammeter 82 is disposed, for example, in the section sandwiched between the nodes N1 and N2. The ammeter 82 has almost no resistance that it imparts to the discharge path DP. Therefore, it can be considered that no semiconductor element due to the ammeter 82 is present in the section sandwiched between the nodes N1 and N2.

[0056] The arithmetic unit 80 may control the opening and closing of at least some of the charging switch 13, the first discharging switch 56, and the second discharging switch 66.

[0057] (3) Parameters The pressure of the refrigerant 73 contained in the refrigerant chamber 70 is set to, for example, 1 MPa or more and 10 MPa or less.

[0058] The first voltage V1 is, for example, 100V or more and 2000V or less.

[0059] The second voltage V2 is, for example, not less than 20 kV and not more than 100 kV.

[0060] The third voltage V3 is, for example, not less than 20 kV and not more than 100 kV.

[0061] The current I generated by the discharge is, for example, 50 A or more.

[0062] The diameter φ of each of the first electrode 71 and the second electrode 72 is, for example, 3 mm or less. Preferably, the diameter φ is 1 mm or less. More preferably, the diameter φ is 0.5 mm or less.

[0063] The distance D between the first electrode 71 and the second electrode 72 is, for example, 10 μm or more.

[0064] The capacitance C is, for example, 30 μF or more.

[0065] The magnetic permeability μ of each of the first reactor core 51 and the second reactor core 61 is, for example, 250 H / m or more.

[0066] The number of turns N of each of the first secondary coil 53 and the second secondary coil 63 is, for example, 20 or more and 100 or less.

[0067] The energy E is, for example, 1 mJ or more and 5000 J or less. Preferably, the energy E is 1 mJ or more and 2500 J or less.

[0068] (4) Refrigerant evaluation procedure The evaluation procedure for refrigerant 73 includes the following steps:

[0069] In the first step, the refrigerant 73 is introduced into the internal space of the refrigerant chamber .

[0070] In the second step, the calculation unit 80 acquires the pressure of the refrigerant 73 as the first pressure P1.

[0071] In the third step, the charging switch 13 is temporarily closed to charge the capacitor 31. As a result, the first voltage V1 held by the capacitor 31 is applied between the first electrode 71 and the second electrode 72. However, no discharge occurs in the refrigerant 73 yet.

[0072] In the fourth step, the first discharge switch 56 and the second discharge switch 66 are simultaneously closed, causing the reactor unit 40 to generate a second voltage V2 by induction. The second voltage V2 is applied between the first electrode 71 and the second electrode 72. In the fifth step, the second voltage V2 generates plasma in the coolant 73, thereby causing electrical conduction between the first electrode 71 and the second electrode 72.

[0073] In the sixth step, the charge Q stored in the capacitor 31 flows between the first electrode 71 and the second electrode 72, thereby initiating a discharge in the refrigerant 73.

[0074] In a seventh step, the calculation unit 80 acquires the pressure of the refrigerant 73 as the second pressure P2.

[0075] In an eighth step, the calculation unit 80 calculates the extent of the disproportionation reaction in the refrigerant 73 based on the first pressure P1 and the second pressure P2. When the refrigerant 73 obtains energy E from the discharge, a chemical reaction occurs in the refrigerant 73, causing a change in the number of molecules of the refrigerant 73. The number of molecules of the refrigerant 73 is acquired as a pressure value by the pressure sensor 74. The change in the number of molecules depends on the number of reactable refrigerant molecules that the refrigerant 73 initially contained in the internal space of the refrigerant chamber 70. Therefore, the number of reactable refrigerant molecules that the refrigerant 73 contained at the time of introduction into the refrigerant chamber 70 is calculated based on the first pressure P1 and the second pressure P2. This number of reactable refrigerant molecules is used as an index showing the extent of the disproportionation reaction that has already occurred in the refrigerant 73.

[0076] This index may be calibrated by the magnitude of energy E obtained by the refrigerant 73 from the discharge. The magnitude of the energy may be calculated from the third voltage V3 measured by the voltmeter 81 and the current I measured by the ammeter 82.

[0077] (5) Features (5-1) The reactor unit 40 has two reactors, the first reactor 50 and the second reactor 60. Therefore, the reactor unit 40 can have a large reactance, and therefore the reactor unit 40 can generate a large second voltage V2. Therefore, when a high-pressure refrigerant 73 is placed between the first electrode 71 and the second electrode 72, a discharge can be initiated by the second voltage V2, which is a large induced voltage, and thereby the energy E stored in the capacitor 31 can be provided to the refrigerant 73, making it possible to evaluate the disproportionation reaction of the refrigerant 73.

[0078] When the refrigerant 73 is kept at a high pressure, discharge due to dielectric breakdown is unlikely to occur. To generate a discharge in the high-pressure refrigerant 73, a large voltage must be applied to the refrigerant 73 to generate plasma in the refrigerant. In the present invention, a large second voltage V2 can be induced by using two reactors. Therefore, discharge due to dielectric breakdown can be generated in the high-pressure refrigerant 73.

[0079] (5-2) The first reactor core 51 and the second reactor core 61 are made of ferrite, which makes it easy to increase the second voltage V2.

[0080] (5-3) The first reactor core 51 and the second reactor core 61 have a large magnetic permeability μ, which makes it easy to increase the second voltage V2.

[0081] (5-4) The first secondary coil 53 and the second secondary coil 63 have a predetermined number of turns. Therefore, by cooperating with the first reactor core 51 and the second reactor core 61, the first secondary coil 53 and the second secondary coil 63 can generate a large second voltage V2.

[0082] (5-5) The resistivity of the material of the first secondary coil 53 and the second secondary coil 63 is low, so the loss of energy E can be reduced.

[0083] (5-6) The discharge path DP does not include a semiconductor element. Therefore, the discharge path DP can handle a large current that exceeds the rated current of the semiconductor element, which is about several amperes, and therefore the discharge path DP can provide a large amount of energy E to the refrigerant 73.

[0084] Increasing the magnitude of the energy E applied to the refrigerant 73 stabilizes the magnitude of the energy E, thereby improving the reproducibility of the disproportionation reaction occurring in the refrigerant 73. Therefore, the likelihood of the disproportionation reaction occurring for a specific refrigerant 73 can be evaluated with high accuracy.

[0085] Furthermore, by varying the magnitude of the energy E applied to the refrigerant 73 over a wide range, it is possible to further improve the accuracy of the evaluation of the likelihood of the disproportionation reaction occurring for a particular refrigerant 73. For example, the magnitude of the energy E may be varied from the order of several mJ to the order of several thousand J.

[0086] (5-7) By passing a current through the first primary coil 54 and the second primary coil 64, a second voltage V2 can be induced.

[0087] (5-8) The value of the second voltage V2 is large. Therefore, the discharge device 20 can provide a large amount of energy E to the refrigerant 73, and the amount of energy E that the refrigerant 73 receives is stable.

[0088] (5-9) The value of the current I involved in the discharge is large. Therefore, the discharge device 20 can provide a large amount of energy E to the refrigerant 73, and the amount of energy E that the refrigerant 73 receives is stable.

[0089] (5-10) The diameter φ of the first electrode 71 and the second electrode 72 is small. Therefore, the volumes of the first electrode 71 and the second electrode 72 are small, so there is little risk that the thermal energy temporarily generated by the discharge will be cooled by the metal material forming the first electrode 71 or the second electrode 72.

[0090] (5-11) A large distance D is maintained between the first electrode 71 and the second electrode 72. Therefore, the magnitude of the energy E received by the refrigerant 73 is stabilized.

[0091] (5-12) Capacitor 31 has a large capacitance C. Therefore, discharge device 20 can provide large energy E to refrigerant 73, and the amount of energy E received by refrigerant 73 is stable.

[0092] (5-13) The discharge device 20 can provide the refrigerant with a large amount of energy E. Therefore, the refrigerant evaluation device 100 can stably determine the degree of the disproportionation reaction of the refrigerant 73.

[0093] <Modifications of the basic embodiment> (6) Variations (6-1) First Modification In the above-described embodiment, in the charging device 10, the resistor 12 and the charging switch 13 are both connected to the positive terminal 11a of the DC power supply 11. Alternatively, at least one of the resistor 12 and the charging switch 13 may be connected to the negative terminal 11b of the DC power supply 11.

[0094] (6-2) Second Modification In the above-described embodiment, the reactor unit 40 is connected between the node N3 and the node N5 located on the positive terminal 11a side of the DC power supply 11. Alternatively, the reactor unit 40 may be connected between the node N1 and the node N2 located on the negative terminal 11b side of the DC power supply 11.

[0095] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims. [Explanation of symbols]

[0096] 10: Charging device 20:Discharge device 30: Energy storage unit 31: Capacitor 40: Reactor section 50: First reactor (reactor) 51: First reactor core (reactor core) 53: First secondary coil (coil) 54: 1st primary coil (input coil) 60: Second reactor (reactor) 61: Second reactor core (reactor core) 63: Secondary coil (coil) 64: Second primary coil (input coil) 70: Refrigerant chamber 71: 1st electrode 72: 2nd electrode 73: Refrigerant 74: Pressure sensor 80: Calculation unit 100: Refrigerant evaluation device C: Capacitance D: Separation distance DP: Discharge path E: Energy I: Current N: Number of turns P1: First pressure P2: Second pressure Q:Charge V0: DC voltage V1: First voltage V2: Second voltage V3: Third voltage φ: Diameter μ: Magnetic permeability [Prior art documents] [Non-patent literature]

[0097] [Non-Patent Document 1] Japanese Industrial Standard (JIS) Z8834

Claims

1. a first electrode (71) and a second electrode (72) spaced apart from each other; By storing energy (E), a first voltage (V １ ) a capacitor (31) to apply A second voltage (V ２ a reactor section (40) for initiating a discharge of the energy between the first electrode and the second electrode by inductively generating a a discharge device (20) having a refrigerant chamber (70) in which the first electrode and the second electrode are arranged and which can accommodate a refrigerant (73); a pressure sensor (74) for acquiring the pressure of the refrigerant; a calculation unit (80) for calculating the degree of disproportionation reaction of the refrigerant based on an output of the pressure sensor; Equipped with the second voltage induced in the reactor section is applied to the first electrode and the second electrode, thereby starting discharge of the energy in the refrigerant. A refrigerant evaluation device (100).

2. Further comprising a discharge path (DP) through which the energy is transferred during the discharge; the discharge path includes the capacitor, the first electrode, and the second electrode; The discharge path does not include a semiconductor element. The refrigerant evaluation device according to claim 1 .

3. The second voltage (V ２ ) is 20 kV or more and 100 kV or less; The refrigerant evaluation device according to claim 1 or 2.

4. The current (I) flowing through the first electrode or the second electrode is 50 A or more. The refrigerant evaluation device according to any one of claims 1 to 3.

5. The diameter (φ) of each of the first electrode and the second electrode is 3 mm or less. The refrigerant evaluation device according to any one of claims 1 to 4.

6. The first electrode and the second electrode are spaced apart from each other by 10 μm or more. The refrigerant evaluation device according to any one of claims 1 to 5.

7. The capacitance (C) of the capacitor is 30 μF or more. The refrigerant evaluation device according to any one of claims 1 to 6.

Images