Calorimeter and its control method

Abstract

The present invention provides a calorimeter that can improve measurement accuracy by preventing heat generated from the object being measured from accumulating inside and reducing measurement accuracy. [Solution] The calorimeter 1 comprises a measuring case 9 that houses a coil 15 inside, a measuring case temperature sensor T2 that measures the temperature of the measuring case 9, a measuring case Peltier element 11 that heats or cools the measuring case 9 to control its temperature, a heat flow sensor 17 that is thermally connected between the measuring case 9 and the measuring case Peltier element 11, a guard case temperature sensor T1 that measures the temperature of the guard case 7 outside the measuring case 9, and a control unit that controls the measuring case Peltier element 11 so that the temperature measured by the measuring case temperature sensor T2 and the temperature measured by the guard case temperature sensor T1 are the same, and then measures the heat flow using the heat flow sensor 17 when the coil 15 is heated.

Description

Technical Field

[0001] The present invention relates to a calorimeter suitable for measuring, for example, the calorific value of electronic components and a control method thereof.

Background Art

[0002] There is known a calorimeter that houses a measurement object in a case and measures the calorific value released by the measurement object (Patent Document 1). The calorimeter described in Patent Document 1 is provided with a plurality of heat insulation shields so as to surround the measurement object housed inside, so as not to be affected by the ambient temperature.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the calorimeter described in Patent Document 1 is a differential scanning calorimeter and is intended to measure a minute calorific value on the order of 10 nanowatts. On the other hand, when an electronic component such as a coil or a capacitor used for a control board or a power supply board is used as a measurement object, the calorific value becomes heat generation far exceeding the order of 10 nanowatts. In the case of such heat generation, if a plurality of heat insulation shields provided to eliminate the influence of the ambient temperature as in Patent Document 1 are provided, heat will accumulate inside and accurate measurement cannot be performed. Thus, when an adiabatic structure is adopted so as not to be affected by the ambient temperature, there is a problem that the measurement accuracy is impaired by the heat generated from the measurement object.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a calorimeter and a control method thereof that can prevent heat generated from a measurement object from staying inside and degrading the measurement accuracy, and can improve the measurement accuracy. [Means for solving the problem]

[0006] A calorimeter according to one aspect of the present invention comprises a measuring case that houses a heat-generating element which is the object to be measured; a temperature sensor for the measuring case that measures the temperature of the measuring case; a temperature control element for the measuring case that heats or cools the measuring case to control its temperature; a heat flow sensor thermally connected between the measuring case and the temperature control element for the measuring case; an external temperature sensor that measures the temperature outside the measuring case; and a device that controls the temperature control element for the measuring case so that the temperature measured by the temperature sensor for the measuring case and the temperature measured by the external temperature sensor are the same. Later The system includes a control unit that measures the heat flow using the heat flow sensor when the heating element generates heat.

[0007] By controlling the temperature control element for the measurement case so that the temperature measured by the temperature sensor for the measurement case and the temperature measured by the external temperature sensor are the same, heat transfer is permitted only to the temperature control element for the measurement case, and heat transfer from other areas of the measurement case to the outside is suppressed as much as possible. In this state, when the heating element generates heat and releases a predetermined amount of heat, heat transfer is limited to the direction passing through the temperature control element for the measurement case, so that almost all of the heat generated by the heating element can be directed to the heat flow sensor installed between the measurement case and the temperature control element for the measurement case. As a result, by selectively directing the amount of heat generated by the heating element to the heat flow sensor, problems such as heat generated from the heating element accumulating inside the measurement case and impairing measurement accuracy are avoided, and the amount of heat can be measured with high accuracy. Furthermore, since the heat flow measurement can be terminated once the heat generation of the heating element has reached a steady state, there is no need to wait for the entire measurement case containing the heating element to reach a constant temperature before measurement can be taken. This reduces the measurement time. Typically, a Peltier element is used as the temperature control element for the measurement case. For the measurement case, it is preferable to use a material with high thermal conductivity, such as metal.

[0008] Furthermore, in a calorimeter according to one aspect of the present invention, the measurement case is housed inside a guard case in which a temperature control element for the measurement case is thermally connected to the inner surface of one wall, and a temperature control element for the guard case is provided on the outer surface of the first wall on the opposite side of the first wall from the temperature control element, and controls the temperature of the guard case, and the external temperature sensor measures the temperature of the guard case.

[0009] A guard case is provided to house the case, and the temperature of the guard case is controlled by a temperature control element for the guard case. The temperature of the guard case is measured by an external temperature sensor, and the temperature control element for the guard case is controlled so that it matches the temperature measured by the case temperature sensor. As a result, heat transfer between the case and the guard case occurs via a heat flow sensor, a temperature control element thermally connected to one wall of the guard case, and a temperature control element for the guard case. At this time, since heat transfer occurs exclusively via the heat flow sensor, the amount of heat generated can be measured with high accuracy. Furthermore, since the case is enclosed in a protective case, the influence of the outside air can be eliminated. For the guard case, it is preferable to use a material with high thermal conductivity, such as metal.

[0010] Furthermore, in a calorimeter according to one aspect of the present invention, a housing is provided that accommodates the guard case inside.

[0011] By housing the guard case inside the housing, the guard case can be isolated from the outside air. This allows the temperature of the guard case to be controlled to a constant level without being affected by the outside air.

[0012] Furthermore, in a calorimeter according to one aspect of the present invention, the guard case has an insulating wall portion.

[0013] By providing an insulating wall section in the guard case, external heat influences can be avoided.

[0014] Furthermore, a calorimeter according to one aspect of the present invention is equipped with a heat sink that is thermally connected to the temperature control element for the measuring case and releases heat to the outside.

[0015] The heat sink allows heat passing through the temperature control element for the measurement case to be released to the outside.

[0016] Furthermore, a calorimeter according to one aspect of the present invention is equipped with a heat sink that is thermally connected to the temperature control element for the guard case and releases heat to the outside.

[0017] A heat sink thermally connected to the temperature control element for the guard case allows heat passing through the temperature control element to be released to the outside. This prioritizes the release of heat from the heat-generating element to the outside via the temperature control element for the guard case, thereby eliminating the adverse effects that would occur if the heat released from the temperature control element for the guard case were to return to the guard case or other components.

[0018] A control method for a calorimeter according to one aspect of the present invention comprises a measuring case that houses a heat-generating element which is the object to be measured; a temperature sensor for the measuring case that measures the temperature of the measuring case; a temperature control element for the measuring case that heats or cools the measuring case to control the temperature of the measuring case; a heat flow sensor that is thermally connected between the measuring case and the temperature control element for the measuring case; and an external temperature sensor that measures the temperature outside the measuring case, wherein the temperature control element for the measuring case is controlled so that the temperature measured by the temperature sensor for the measuring case and the temperature measured by the external temperature sensor become the same. Later When the heating element generates heat, the heat flow is measured by the heat flow sensor. [Effects of the Invention]

[0019] This prevents heat generated from the object being measured from accumulating inside and reducing measurement accuracy, thereby improving measurement accuracy. [Brief explanation of the drawing]

[0020] [Figure 1] This is a longitudinal sectional view showing a calorimeter according to an embodiment of the present invention. [Figure 2] This is a longitudinal sectional view of a calorimeter with the housing omitted. [Figure 3A] This is a longitudinal sectional view showing the connection part of the heat insulating wall. [Figure 3B] This is a longitudinal sectional view showing the heat flow when the heat conductive material in FIG. 3A is omitted. [Figure 4] This is a longitudinal sectional view showing a calorimeter with the guard case omitted. [Figure 5] This is a longitudinal sectional view showing a calorimeter according to a reference embodiment of the present invention.

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In FIG. 1, a calorimeter 1 according to this embodiment is shown. The calorimeter 1 includes a heat sink 3 located below and a housing 5 provided above the heat sink 3. In each figure, the up-down, left-right directions are for convenience of explanation and do not limit the invention.

[0022] The heat sink 3 is rectangular in plan view, and a plurality of fins 3b protruding downward are provided under a plate-shaped base portion 3a. Heat is released to the outside (ambient air) by the heat sink 3. A fan may be attached to the heat sink 3.

[0023] The housing 5 is a box body provided so as to form a closed space above the heat sink 3. The housing 5 prevents the influence of external wind and heat, and for example, resin is used as the material.

[0024] Inside the housing 5 and above the heat sink 3, a guard case 7 and a measurement case 9 provided inside the guard case 7 are provided.

[0025] The guard case 7 is made of a metal such as aluminum alloy and is a box-shaped structure that forms a closed space inside.

[0026] A Peltier element for the guard case (temperature control element for the guard case) 10 is provided at the lower center of the bottom wall (first wall) 7c of the guard case 7. The upper surface of the Peltier element for the guard case 10 is thermally connected to the bottom wall 7c of the guard case 7, and the lower surface of the Peltier element for the guard case 10 is thermally connected to the upper surface of the heat sink 3. As shown in Figure 1, the wiring 10a of the Peltier element for the guard case 10 extends to the outside and is connected to the control unit 30.

[0027] A temperature sensor (external temperature sensor) T1 for the guard case is provided on the bottom wall 7c of the guard case 7. The output of the Peltier element 10 for the guard case is controlled by the control unit 30 via wiring 10a based on the measurement value of the temperature sensor T1 for the guard case.

[0028] The bottom wall portion 7c of the guard case 7 is provided with a predetermined space between it and the upper surface of the heat sink 3. In other words, the bottom wall portion 7c of the guard case 7 is supported from below by the guard case Peltier element 10, while being separated from the heat sink 3.

[0029] A Peltier element for the measurement case (temperature control element for the measurement case) 11 is provided at the upper center of the bottom wall 7c of the guard case 7. The lower surface of the Peltier element for the measurement case 11 is thermally connected to the bottom wall 7c of the guard case 7. The wiring 11a of the Peltier element for the measurement case 11 extends to the outside, as shown in Figure 1. The output of the Peltier element for the measurement case 11 is controlled by the control unit 30 via the wiring 11a.

[0030] The measuring case 9 is housed within the internal space of the guard case 7. The measuring case 9 is made of metal such as aluminum alloy and has a box-like shape, for example, a bottomed cylindrical shape, that forms a closed space inside.

[0031] The coil 15, which is the object to be measured, is placed inside the measurement case 9. The power supply line 15a of the coil 15 extends to the outside, as shown in Figure 1.

[0032] The measurement case 9 is equipped with a temperature sensor T2 for the measurement case. The output of the Peltier element 11 for the measurement case is controlled by the control unit 30 via wiring 11a based on the measured value of the temperature sensor T2 for the measurement case.

[0033] A heat flow sensor 17 is provided at the lower center of the bottom wall 9c of the measurement case 9. The output of the heat flow sensor 17 is transmitted to the control unit 30.

[0034] From top to bottom, the components are stacked in the following order: the bottom wall 9c of the measurement case 9, the heat flow sensor 17, the Peltier element 11 for the measurement case, the bottom wall 7c of the guard case 7, the Peltier element 10 for the guard case, and the base 3a of the heat sink 3 (hereinafter referred to as the "stacked section"). Each component is in thermal contact with the others. Outside of this stacked section, there is no thermal contact between the components. In other words, the heat generated by the coil 15 passes only through the stacked section. As indicated by arrow Q, the heat generated by the coil 15 passes only through the stacked section and is dissipated to the outside from the heat sink 3.

[0035] The guard case 7 is supported by the heat sink 3 via the Peltier element 10 for the guard case, and the other walls of the guard case 7 are not in contact with anything else. The measurement case 9 is supported by the bottom wall 7c of the guard case 7 via the Peltier element 11 for the measurement case and the heat flow sensor 17, and the other walls of the measurement case 9 are not in contact with the walls of the guard case 7. In other words, the measurement case 9 is positioned with space between it and the guard case 7, except for the center of the bottom wall 9c.

[0036] The control unit 30 is composed of, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions are stored in the storage medium in the form of a program, for example. The CPU reads this program into the RAM and performs information processing and calculations to realize the various functions. The program may be pre-installed in the ROM or other storage medium, provided in a state where it is stored in a computer-readable storage medium, or distributed via wired or wireless communication. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memory, etc.

[0037] Next, the control method for the calorimeter 1 described above will be explained. The coil 15, which is the object to be measured, is placed inside the measurement case 9. Then, after the measurement case 9 is placed inside the guard case 7, the outside of the guard case 7 is covered with the housing 5.

[0038] Next, the control unit 30 controls the output of the Peltier element 10 for the guard case so that the temperature sensor T1 for the guard case reaches the target temperature, which is room temperature (for example, 23°C). Also, the control unit 30 controls the output of the Peltier element 11 for the measurement case so that the temperature sensor T2 for the measurement case matches the target temperature of the guard case temperature sensor T1.

[0039] When the temperature sensor T1 for the guard case and the temperature sensor T2 for the measurement case reach a common target temperature, there is no heat transfer between the measurement case 9 and the guard case 7. Therefore, the output of the heat flow sensor 17 at this time is approximately zero.

[0040] In this state, a predetermined AC voltage is applied to the coil 15 and a predetermined AC current is passed through it. The AC voltage and AC current are measured by a voltage sensor (not shown) and a current sensor (not shown), and their outputs are transmitted to the control unit 30.

[0041] By applying an alternating voltage and alternating current, the coil 15 generates heat and releases a predetermined amount of heat. The released heat is discharged from the inside of the measurement case 9 through the bottom wall 9c, through the laminated section including the heat flow sensor 17, and out from the heat sink 3. The output obtained by the heat flow passing through the heat flow sensor 17 is transmitted to the control unit 30.

[0042] The control unit 30 calculates the amount of heat from the measured value obtained when the heat generation of the coil 15 becomes constant and the output obtained from the heat flow sensor 17 becomes constant.

[0043] As described above, the calorimeter 1 can accurately obtain the amount of heat generated by the coil 15, and for example, the obtained amount of heat generated by the coil 15 can be used as follows.

[0044] The amount of heat generated by coil 15 is expressed by the following formula. P=U×I×cos(90°+δ) ·····(1) Here, P is the active power, U is the voltage, and I is the current.

[0045] Then, by substituting the amount of heat obtained by the calorimeter 1 for the active power P, the voltage obtained by the voltage sensor for U, and the current obtained by the current sensor for I into equation (1), the loss angle δ can be calculated by the control unit 30.

[0046] Low-power-factor electronic components such as coils theoretically have a phase difference of 90°. However, actual products have a small power loss angle δ. Even a small power loss angle δ significantly affects the active power P. By using a calorimeter 1, the active power P can be measured with high accuracy, making it possible to measure even minute power loss angles δ.

[0047] The effects and advantages of this embodiment, as described above, are as follows. The Peltier elements 10 for the guard case and 11 for the measurement case are controlled so that the temperature measured by the temperature sensor T2 for the measurement case and the temperature measured by the temperature sensor T1 for the guard case are the same. As a result, heat transfer is permitted only to the laminated portion including the heat flow sensor 17, and heat transfer from other areas of the measurement case 9 to the outside is suppressed as much as possible. In this state, when the coil 15 generates heat and releases a predetermined amount of heat, heat transfer is limited to the laminated portion, so almost all of the heat generated by the coil 15 can be directed to the heat flow sensor 17. In this way, by selectively guiding the amount of heat generated by the coil to the heat flow sensor 17, the heat generated from the coil 15 does not accumulate inside and can be measured accurately.

[0048] Furthermore, since the heat flow measurement can be terminated when the heat generation of the coil 15 becomes steady, there is no need to wait for the measurement to be completed until the entire measurement case 9 housing the coil 15 reaches a constant temperature. This reduces the measurement time.

[0049] By housing the guard case 7 inside the housing 5, the guard case 7 can be isolated from the outside air. This allows the temperature of the guard case 7 to be controlled to a constant level without being affected by the outside air.

[0050] The heat sink 3, which is thermally connected to the Peltier element 10 for the guard case, can release the heat passing through the Peltier element to the outside. This allows the heat released by the coil 15 to be preferentially released to the outside via the Peltier element 10 for the guard case, thereby eliminating the adverse effects that would occur if the heat released from the Peltier element 10 for the guard case returned to the guard case 7, etc.

[0051] Furthermore, this embodiment can be modified as follows. As shown in Figure 2, the housing 5 may be omitted. The number of components can be reduced if the influence of outside air can be eliminated by temperature control of the Peltier element 10 for the guard case.

[0052] Furthermore, an insulating wall may be used in the guard case 7 shown in Figure 2. Specifically, the guard case 7 is composed of an upper container 7d and a lid 7e that seals the lower opening of the upper container. An insulating wall is used in the upper container 7d. As the insulating wall, a double-wall structure with a vacuum space formed between the inner wall and the outer wall can be used. By using an insulating wall for the guard case 7, the influence of outside air can be eliminated.

[0053] Figures 3A and 3B show the connection point of the bottom wall 7c when a double-walled vacuum insulation structure is adopted for the guard case 7 as described above. Although no heat is radiated to the outside in the upper container 7d which constitutes the side wall section with an insulating wall, if a flange connection structure is adopted for the connection point with the bottom wall 7c, for example, there is a risk of heat being radiated to the outside from the flange section 7f which is made of metal such as stainless steel. Specifically, as shown by the arrow in Figure 3B, since the upper container 7d has a double wall, there is a risk that the heat transmitted through the inner wall 7g will fold back at the lower end and flow to the outer wall 7h, thus radiating heat to the outside.

[0054] Therefore, as shown in Figure 3A, a thermal conductive material (e.g., thermal gap filler) 22 with a higher thermal conductivity than the air layer is filled into the space formed on the inner circumference of the lower end of the upper container 7d. This suppresses the heat that travels along the inner wall 7g of the upper container 7d from folding back at the lower end and flowing to the outer wall 7h.

[0055] As shown in Figure 4, the guard case 7 and the Peltier element 10 for the guard case may be omitted. A heat sink 3 is directly connected to the bottom of the Peltier element 11 for the measurement case. In addition, an indoor temperature sensor T3 for measuring the indoor temperature is provided. The output of the indoor temperature sensor T3 is transmitted to the control unit 30.

[0056] The temperature control for this modified example is performed as follows. The Peltier element 11 for the measurement case is controlled so that the temperature measured by the indoor temperature sensor T3 and the temperature measured by the temperature sensor T2 for the measurement case are the same. In other words, the Peltier element 11 for the measurement case is controlled so that the temperature of the measurement case 9 becomes the room temperature. As a result, there is no heat transfer from the measurement case 9 to the outside (room), so that the heat generated by the coil 15 passes exclusively through the heat flow sensor 17, as in the embodiment described above (see arrow Q).

[0057] In addition, in the embodiments and modifications described above, a device that maintains a constant temperature (for example, an oil bath) may be used instead of the Peltier element 10 for the guard case and the heat sink 3. Even with a device that maintains a constant temperature, such as an oil bath, it is possible to form the heat flow indicated by arrow Q (see Figure 4, etc.).

[0058] In the embodiments described above, a coil was given as an example of the object to be measured, but it can also be applied to other electronic components such as capacitors.

[0059] [Reference Embodiment] Next, a reference embodiment of the present invention will be described with reference to Figure 5. Figure 5 shows a calorimeter 100 according to a reference embodiment. The calorimeter 100 comprises a lower insulated container 103, an outer lid 105 connected to the insulated container 103, and a heat sink 107.

[0060] The insulated container 103 has a bottomed cylindrical shape with an open top. The walls of the insulated container 103 have a double-wall structure with a vacuum space inside.

[0061] A measuring case 109 is housed inside the insulated container 103. The measuring case 109 is made of metal such as aluminum alloy and has a closed-bottom cylindrical shape. A temperature sensor T4 for the measuring case, such as a thermocouple, is fixed to the measuring case 109. The output of the temperature sensor T4 for the measuring case is transmitted to the control unit 30.

[0062] The coil 15, which is the object to be measured, is placed inside the measurement case 109. The power supply line 15a of the coil 15 is taken out from the measurement case 109 and the insulated container 103 to the outside.

[0063] An outer lid 105 is fixed to the upper end of the insulated container 103. The insulated container 103 and the outer lid 105 may be fixed using a flange connection structure as shown in Figure 3A.

[0064] The outer cover 105 is made of a metal such as stainless steel and airtightly seals the inside of the insulated container 103. A heat sink 107 is provided on the top of the outer cover 105, sandwiching the outer cover Peltier element (temperature control element for the measurement case) 115. The power supply line 115a of the outer cover Peltier element 115 extends to the outside.

[0065] The outer cover 105 is equipped with an outer cover temperature sensor T5. The output of the outer cover temperature sensor T5 is transmitted to the control unit 30. The output of the outer cover Peltier element 115 is controlled by the control unit 30 via the power supply line 115a based on the measurement value of the outer cover temperature sensor T5.

[0066] The calorimeter 100 mentioned above is controlled as follows. The control unit 30 controls the output of the outer lid Peltier element 115 so that the outer lid temperature sensor T5 reaches a certain target temperature (for example, room temperature of 23°C). In this state, power is supplied to the coil 15. As a result, the coil 15 generates heat, and the heat flow flows from the measurement case 109 along the wall of the insulated container 103 to the outer lid 105. The heat flow transmitted to the outer lid 105, which is controlled to a constant temperature, is released to the outside via the outer lid Peltier element 115 and the heat sink 107.

[0067] Once the coil 15 has heated up and a certain amount of time has elapsed, the temperature distribution on the wall of the insulated container 103 becomes constant, and the measured value of the temperature sensor T4 for the measurement case becomes constant. The control unit 30 calculates the amount of heat from the temperature of the temperature sensor T4 for the measurement case, which has reached a constant temperature. The amount of heat can be obtained from a calibration curve that shows the relationship between the known amount of heat generated and the temperature sensor T4 for the measurement case. This calibration curve can be obtained by preliminary testing.

[0068] The calorimeter 100 described above uses an insulated container 103 and controls the outer lid 105 to a constant temperature, so it can measure heat without being affected by external factors. However, after the coil 15 generates heat, it is necessary to wait until the temperature distribution on the wall of the insulated container 103 becomes constant and the temperature of the temperature sensor T4 for the measurement case becomes constant, which results in a longer measurement time. In contrast, the calorimeter 1 shown in Figure 1, etc., does not need to wait until the temperature distribution of the measurement case of the insulated container 103 becomes constant, as in the calorimeter 100, so the measurement time can be shortened. [Explanation of symbols]

[0069] 1 Calorimeter 3 Heatsink 3a Base 3b fins 5 Housing 7 Guard Case 7c Bottom wall section (first wall section) 7d Upper container 7e Lid body 7f Flange section 7g inner wall 7h Exterior wall 9 Measurement Cases 9c Bottom wall 10 Peltier elements for guard cases 10a wiring 11. Peltier element for measurement case 11a Wiring 15. Coil (object to be measured) 15a feeder line 17 Heat flow sensor 22 Thermal conductive material 30 Control Unit 100 calorimeter 103 Insulated container 105 Outer lid 107 Heatsink 109 Measurement Cases 115 Peltier element for outer casing (temperature control element for measurement case) T1 Guard Case Temperature Sensor (External Temperature Sensor) T2 Temperature sensor for measuring case T3 Indoor Temperature Sensor (External Temperature Sensor) T4 Temperature sensor for measuring case T5 Temperature sensor for outer cover

Claims

1. A measuring case that houses the heat-generating element, which is the object to be measured, A temperature sensor for the measurement case that measures the temperature of the measurement case, A temperature control element for a measuring case that heats or cools the measuring case to control the temperature of the measuring case, A heat flow sensor is thermally connected between the measurement case and the temperature control element for the measurement case, An external temperature sensor for measuring the temperature outside the measurement case, A control unit controls the temperature control element for the measurement case so that the temperature measured by the temperature sensor for the measurement case and the temperature measured by the external temperature sensor are the same, and then measures the heat flow using the heat flow sensor when the heating element generates heat. A calorimeter equipped with this feature.

2. A guard case that houses the aforementioned measuring case and has a temperature control element for the measuring case thermally connected to the inner surface of one of its walls, A temperature control element for a guard case is provided on the outer surface of the first wall, which is on the opposite side of the first wall from the temperature control element for the measuring case, and controls the temperature of the guard case. Equipped with, The calorimeter according to claim 1, wherein the external temperature sensor measures the temperature of the guard case.

3. The calorimeter according to claim 2, wherein a housing is provided to house the guard case inside.

4. The heat meter according to claim 2 or 3, wherein the guard case has an insulating wall portion.

5. The calorimeter according to claim 1, further comprising a heat sink that is thermally connected to the temperature control element for the measurement case and releases heat to the outside.

6. The calorimeter according to claim 2 or 3, further comprising a heat sink that is thermally connected to the temperature control element for the guard case and releases heat to the outside.

7. A measuring case that houses the heat-generating element, which is the object to be measured, A temperature sensor for the measuring case that measures the temperature of the measuring case, A temperature control element for a measuring case that heats or cools the measuring case to control the temperature of the measuring case, A heat flow sensor is thermally connected between the measurement case and the temperature control element for the measurement case, An external temperature sensor for measuring the temperature outside the measurement case, A control method for a calorimeter equipped with, A method for controlling a calorimeter, which involves controlling the temperature control element for the measurement case so that the temperature measured by the temperature sensor for the measurement case and the temperature measured by the external temperature sensor are the same, and then measuring the heat flow with the heat flow sensor when the heating element generates heat.

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