JP6514607B2 - Heat dissipation amount derivation device - Google Patents

Description

The present invention relates to a heat release amount deriving device that performs performance evaluation of an air conditioner that air-conditions a room.

  The performance evaluation device for performing the performance evaluation of the conventional air conditioning apparatus arranges an upstream temperature sensor on the upstream side for each grid in which the heat exchanger (condenser) of the outdoor unit is divided into a plurality, and the downstream temperature sensor And the wind speed sensor.

  Then, based on the upstream temperature measured by the upstream temperature sensor, the downstream temperature measured by the downstream temperature sensor, and the wind speed measured by the wind speed sensor, the heat release amount for each grid is derived, and the discharge for each grid is released. The amount of heat is integrated to derive the heat release amount of the heat exchanger (for example, Non-Patent Document 1).

Nobe Tatsuo, Haga Yusuke, Nakamura Hokuto, Tanaka Kotaro, Kiguchi Masayuki, Performance evaluation method of multi-package air conditioner at the time of operation by probe insertion method, Proceedings of the Architectural Institute of Japan, Volume 76, 668, 927-933 , October 2011

  In the above-described performance evaluation apparatus, a sheath thermocouple is used as the downstream temperature sensor, and the tip portion (coupling point) is disposed downstream from the heat exchanger upstream so as to pass through the gap between the fins of the heat exchanger. It was like that. However, the pitch between the fins of the heat exchanger has been narrowed with higher performance, and along with this, the diameter of the sheath thermocouple needs to be made smaller, and it has become difficult to use the existing sheath thermocouple. The In addition, it is also difficult to install the sheath thermocouple having a small diameter through the gap between the fins.

An object of the present invention is to provide a heat dissipation amount deriving device capable of performing performance evaluation more easily than in the prior art in view of such problems.

In order to solve the above problems, the heat radiation amount derivation device of the present invention, the measuring points are arranged for each grid is divided into Oite plurality on the upstream side of the heat exchanger provided in an outdoor unit of an air conditioner, the From the upstream temperature sensor for measuring the upstream average temperature obtained by averaging the upstream temperature measured at the measurement point, the downstream temperature sensor for measuring the average temperature of the air discharged from the outdoor unit as the downstream average temperature, and from the outdoor unit and wind sensor for measuring the wind velocity of air exhausted, and wind speed previously measured the upstream side of each of the grid, based on the wind speed ratio of the wind speed measured by the wind velocity sensor, measured by the upstream temperature sensor The temperature difference between the calculated upstream average temperature and the downstream average temperature measured by the downstream temperature sensor is weighted for each grid, the weighted temperature difference, and the wind speed sensor Ri based on the measured wind speed, and a heat exchanger heat radiation amount deriving unit that derives the heat radiation amount of the heat exchanger.

  The upstream temperature sensor is a thermocouple in which a pair of lead wires made of different metals are joined at a junction point, and the junction point is disposed for each of the grids in the heat exchanger, and the plurality of the upstream temperature sensors are disposed. The lengths of the leads made of at least the same metal joined to the junctions are identical to each other, one end of each lead is joined to one of the junctions, and the other end is made of another identical metal. And the other end of the lead wire.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the thermal radiation amount derivation | leading-out apparatus which can perform performance evaluation easily compared with the past.

It is a figure for demonstrating the structure of the performance evaluation system concerning embodiment. (A) is a figure which shows arrangement | positioning of an upstream thermocouple, a downstream thermocouple, and a wind speed sensor. (B) is a figure which shows arrangement | positioning of the junction point of an upstream thermocouple.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values and the like shown in this embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the specification and the drawings, elements having substantially the same functions and configurations will be denoted by the same reference numerals to omit repeated description, and elements not directly related to the present invention will not be illustrated. Do.

(Performance evaluation system 1)
FIG. 1 is a diagram for explaining the configuration of a performance evaluation system 1 according to the present embodiment. As shown in FIG. 1, the performance evaluation system 1 is installed in a facility such as a building or a school, and is configured by a performance evaluation device 100 that evaluates the performance of a GHP (gas heat pump air conditioner) 10 for cooling and heating air in the facility. . Although GHP 10 can perform air conditioning and heating, since performance evaluation system 1 of the present invention is for performing performance evaluation of GHP 10 during cooling operation, the case where cooling operation is performed for GHP 10 will be described, The description of the heating operation is omitted. Further, in FIG. 1, the flow of the refrigerant at the time of the cooling operation is indicated by a solid arrow.

  The GHP 10 is composed of an outdoor unit 20 installed on the roof of the facility and the like, and an indoor unit 30 installed inside the facility. The outdoor unit 20 includes a gas engine 21, a compressor 22, an outdoor unit heat exchanger 23, an exhaust gas heat exchanger 24, a radiator 25, an outdoor unit fan 26, an outdoor unit motor 27, a GHP control unit 28, and a housing 29. Be done. In the GHP 10, the gas engine 21, the compressor 22, the outdoor unit heat exchanger 23, the exhaust gas heat exchanger 24, the radiator 25, the outdoor unit fan 26, the outdoor unit motor 27 and the GHP control unit 28 are accommodated in the housing 29. .

  The indoor unit 30 includes an indoor unit heat exchanger 31 which exchanges heat between indoor air and a refrigerant, an indoor unit fan 32 which sends indoor air to the indoor unit heat exchanger 31 and promotes heat exchange, and an indoor unit fan It comprises the indoor unit motor 33 which rotationally drives 32.

  The GHP 10 also includes a refrigerant circulation system that includes a refrigerant pipe 41 that circulates the refrigerant between the outdoor unit 20 and the indoor unit 30, a four-way valve 42 that switches the circulation direction of the refrigerant, and an expansion valve 43 that expands the refrigerant; A cooling water circulation system including a cooling water pipe 51 for circulating the cooling water in the machine 20 is provided.

  In the refrigerant circulation system during the cooling operation, the outlet of the compressor 22 and the outdoor unit heat exchanger 23 are connected by the refrigerant pipe 41 via the four-way valve 42. Further, the outdoor unit heat exchanger 23 and the indoor unit heat exchanger 31 are connected by the refrigerant pipe 41 via the expansion valve 43. Further, the indoor unit heat exchanger 31 and the inlet of the compressor 22 are connected by the refrigerant pipe 41 via the four-way valve 42.

  In the cooling water circulation system during the cooling operation, the gas engine 21, the exhaust gas heat exchanger 24, and the radiator 25 are connected by the cooling water pipe 51.

  The gas engine 21 burns a fuel gas (city gas or the like) to generate rotational power, and causes the compressor 22 to rotate by the generated rotational power. The compressor 22 is rotationally driven by the rotational power of the gas engine 21, compresses the refrigerant flowing through the refrigerant pipe 41, and sends it to the outdoor unit heat exchanger 23. The outdoor unit heat exchanger 23 is disposed along the air inlet 29a provided in the housing 29, and the air blown into the housing 29 from the outside by the outdoor unit fan 26 and the refrigerant flowing into the outdoor unit heat exchanger 23 Heat exchange and cool the refrigerant. The refrigerant having passed through the outdoor unit heat exchanger 23 flows into the expansion valve 43 through the refrigerant pipe 41 and is expanded by the expansion valve 43, and then the indoor unit heat exchanger 31 of the indoor unit 30 through the refrigerant pipe 41 Flow into

  The refrigerant flowing into the indoor unit heat exchanger 31 is heated by heat exchange with the air blown into the indoor unit 30 by the indoor unit fan 32, and then the outdoor unit is heated by the refrigerant pipe 41 via the four-way valve 42. It flows into 20 compressors 22. Thus, in the GHP 10, the refrigerant circulates in the refrigerant pipe 41, and the indoor unit heat exchanger 31 cools the indoor air in which the indoor unit 30 is installed.

  The exhaust gas heat exchanger 24 cools the exhaust gas discharged from the gas engine 21 and discharges it to the outside. The radiator 25 exchanges heat between the cooling water circulating through the cooling water pipe 51 and the air blown into the housing 29 by the outdoor unit fan 26 to cool the cooling water.

  The outdoor unit fan 26 is disposed in the vicinity of the air outlet 29b provided in the housing 29, is rotationally driven by the outdoor unit motor 27, and passes from the air inlet 29a to the air outlet 29b via the outdoor unit heat exchanger 23 and the radiator 25. By blowing air, air is sent to the outdoor unit heat exchanger 23 and the radiator 25 to promote heat exchange.

  The GHP control unit 28 is configured by a semiconductor integrated circuit including a CPU (central processing unit), and controls the entire GHP 10 (for example, the gas engine 21, the outdoor unit motor 27, the indoor unit motor 33, etc.).

  The indoor unit fan 32 is rotationally driven by the indoor unit motor 33, sends air to the indoor unit heat exchanger 31 to promote heat exchange, and blows the air cooled by the indoor unit heat exchanger 31 into the room.

  The performance evaluation apparatus 100 includes a performance evaluation unit 101, a data logger 102, an upstream thermocouple 103, a downstream thermocouple 104, and a wind speed sensor 105. The performance evaluation unit 101 is configured of a semiconductor integrated circuit including a CPU (central processing unit), and serves as a heat exchanger heat release amount derivation unit 110, an outdoor unit production heat amount derivation unit 112, and a COP (Coefficient Of Performance) derivation unit 114. Function.

  The data logger 102 is connected to the performance evaluation unit 101 and connected to the upstream thermocouple 103, the downstream thermocouple 104, and the wind speed sensor 105, and the average upstream temperature measured by the upstream thermocouple 103 and the downstream thermocouple 104 And the downstream average temperature are collected and stored, and the wind speed measured by the wind speed sensor 105 is collected and stored.

  2A shows the arrangement of the upstream thermocouple 103, the downstream thermocouple 104, and the wind speed sensor 105, and FIG. 2B shows the arrangement of the junction 120 of the upstream thermocouple 103. . In FIG. 2A, for convenience of explanation, a part of the first thermocouple wire 122 and the second thermocouple wire 124 of the upstream thermocouple 103 is omitted.

  As shown in FIG. 2A, the upstream thermocouple 103 includes a plurality of (18 in the present embodiment) first and second thermocouple wires 122 and 124 made of different metals, and the first thermocouple A first lead wire 126 made of the same metal as the wire pair 122 and a second lead wire 128 made of the same metal as the second thermocouple wire 124 are provided.

  The junction point 120 of the first thermocouple wire 122 and the second thermocouple wire 124 is separated from the side facing the air inlet 29a of the outdoor unit heat exchanger 23 by a predetermined distance, and is shown in FIG. As described above, the grids 160 (160a to 160i) are respectively arranged by dividing the side facing the air inlet 29a in the outdoor unit heat exchanger 23 into nine equal parts. The grid 160 and the number of junctions 120 arranged on each grid 160 will be described in detail later.

  Further, the lengths of the first thermocouple wires 122 joined to the respective junctions 120 (the lengths from the respective junctions 120 to the first junctions 130) are all the same, and One thermocouple wire 122 is coupled to the first lead wire 126. One end of the first lead wire 126 is collectively joined to the first thermocouple wire 122 joined to each junction 120, and the other end of the first lead wire 126 is connected to the data logger 102.

  Similarly, the lengths (lengths from the junction 120 to the second junction 132) of the second thermocouple wires 124 joined to the respective junctions 120 are all the same, and all second junctions 132 Two thermocouple wires 124 are coupled to the second lead 128. One end of the second lead wire 128 is collectively joined to the second thermocouple wire 124 joined to each junction point 120, and the other end of the second lead wire 128 is connected to the data logger 102.

  Thus, by making the lengths of the first thermocouple wire 122 and the second thermocouple wire 124 joined to each junction point 120 the same, each of the first thermocouple wire 122 and the second thermocouple wire 124 The resistance can be made identical. As a result, the upstream thermocouple 103 can measure the average temperature at each junction 120, that is, the average temperature upstream of the outdoor unit heat exchanger 23 (hereinafter also referred to as the upstream average temperature).

  The downstream thermocouple 104 is made of a plurality of (four in the present embodiment) first and second thermocouple wires 142 and 144 made of different metals, and the same metal as the first thermocouple wire 142. A first lead wire 146 and a second lead wire 148 made of the same metal as the second thermocouple wire 144 are provided.

  A junction 140 of the first thermocouple wire 142 and the second thermocouple wire 144 is disposed at a predetermined distance from the air outlet 29 b of the housing 29. Further, the lengths of the first thermocouple wires 142 joined to the respective junctions 140 (the lengths from the respective junctions 140 to the first junction 150) are all the same, and One thermocouple wire 142 is coupled to the first lead wire 146. One end of the first lead wire 146 is collectively coupled to the first thermocouple wire 142 joined to each junction point 140, and the other end of the first lead wire 146 is connected to the data logger 102.

  Similarly, the lengths (the lengths from each junction 140 to the second junction 152) of the second thermocouple wire 144 joined to each junction 140 are all the same, and all the A second thermocouple wire 144 is coupled to the second lead 148. One end of the second lead wire 148 is collectively joined to the second thermocouple wire 144 joined to each junction point 140, and the other end of the second lead wire 148 is connected to the data logger 102.

  Thus, by making the lengths of the first thermocouple wire 142 and the second thermocouple wire 144 joined to the respective junctions 140 identical, the respective ones of the first thermocouple wire 142 and the second thermocouple wire 144 can be obtained. The resistance can be made the same. As a result, the downstream thermocouple 104 can measure the average temperature at each junction 140, that is, the average temperature of the air discharged from the housing 29 (hereinafter, also referred to as the downstream average temperature). In addition, as long as the downstream thermocouple 104 can measure the average temperature of the air discharged from the housing 29, only one thermocouple (junction point) may be provided.

  The wind speed sensor 105 is disposed at the air outlet 29 b of the housing 29 and measures the wind speed of the air discharged from the housing 29.

  Here, the grid 160 divides the outdoor unit heat exchanger 23 into nine parts on a plane perpendicular to the wind direction. The upstream side surface of the outdoor unit heat exchanger 23 is disposed to face the air inlet 29 a of the housing 29. However, depending on the position where the outdoor unit 10 is disposed, the outdoor unit heat exchanger 23 is fed at each location. The temperature of the air (upstream temperature) changes. In addition, the wind speed differs depending on the location of the outdoor unit heat exchanger 23 depending on the relationship between the position of the outdoor unit fan 26 and the position of the air outlet 29 b in the housing 29. Therefore, the grid 160 divides the range where the upstream temperature is the same and the wind speed can be considered the same (for example, a square having a side of 30 cm) to be the same grid, and in the present embodiment, 9 The number of compartments can be set arbitrarily.

  And in this embodiment, the wind speed ratio of three grids 160a-160c of upper near the air outlet 29b, three grids 160d-160f of the center, and three grids 160g-160i far from the air outlet 29b is 3 2: 1, and a number of junctions 120 corresponding to the wind speed ratio are arranged on each grid 160. Specifically, as shown in FIG. 2B, three junctions 120 are disposed in the grids 160a to 160c having the wind speed ratio of 3, and two grid points 160d to 160f having the wind speed ratio of 2 are provided. The junctions 120 are disposed, and one junction 120 is disposed in the grids 160g to 160i in which the wind speed ratio is one.

ここで、Ｔは重み付け平均温度差（Ｋ・ｍ^２）であり、ａ_ｎは各グリッド１６０での上流側の風速と、ハウジング２９の空気出口２９ｂでの風速との風速比であり、Ｓ_ｎは各グリッド１６０の面積（ｍ^２）であり、ｔ_{ｉｎ，ａｖｅ}は上流平均温度（Ｋ）であり、ｔ_{ｏｕｔ，ａｖｅ}は下流平均温度（Ｋ）であり、ｎはグリッド数である。なお、各グリッド１６０の風速比ａ_ｎは、各グリッド１６０の上流側に風速センサを配置して、予め計測することにより導出することができる。また、各グリッド１６０の風速比ａ_ｎは、一度導出すれば、風速によらずほぼ変化しないことが過去の測定実績（非特許文献１）により確認されている。 Returning to FIG. 1, the performance evaluation apparatus 100 can always perform performance evaluation during cooling operation (in real time). Specifically, the heat exchanger heat release amount deriving unit 110 sets the temperature difference between the upstream average temperature measured by the upstream thermocouple 103 and the downstream average temperature measured by the downstream thermocouple 104 to the wind speed of each grid 160. The weighted average temperature difference T weighted based on the ratio is derived by equation (1).

Here, T is the weighted average temperature difference _{^{(K · m 2), a}} n is the velocity of the upstream side of each grid 160, a wind speed ratio of the wind speed at the air outlet 29b of the housing 29, _{S n} Is the area (m ² ) of each grid 160, t _{in, ave} is the upstream average temperature (K), t _{out, ave} is the downstream average temperature (K), and n is the number of grids. Incidentally, the wind speed ratio a _n of each grid 160 may place the wind velocity sensor on the upstream side of each grid 160, it can be derived by pre-measurement. Further, the wind speed ratio a _n of each grid 160 Once derived, it does not substantially change regardless of the wind speed is confirmed by the past measurement results (Non-Patent Document 1).

ここで、Ｑは室外機総熱交換量（Ｗ）であり、ρは空気密度（ｋｇ／ｍ^３）であり、Ｃ_ｐは定圧比熱（ｋＪ／（ｋｇ／Ｋ））である。 Further, the heat exchanger heat release amount deriving unit 110 derives the outdoor unit total heat exchange amount Q by the equation (2) using the derived weighted average temperature difference T.

Here, Q is the outdoor unit total heat exchange amount (W), ρ is the air density (kg / m ³ ), and C _p is constant pressure specific heat (kJ / (kg / K)).

  Thus, by deriving the weighted average temperature difference T obtained by weighting the temperature difference for each grid 160 according to the wind speed ratio, the heat release amount for each grid 160 in which the heat release amount increases in proportion to the wind speed ratio The downstream temperature does not have to be measured and derived individually, and the outdoor unit total heat exchange amount Q obtained by integrating the heat release amount for each grid 160 can be easily derived.

ここで、Ｅ_Ｐは室外機製造熱量（Ｗ）であり、Ｅ_ＣＤは室外機熱交換器２３の放熱量（Ｗ）であり、Ｅ_ＩＧはガス消費量（Ｗ）であり、Ｅ_Ｒはラジエーター２５の放熱量（Ｗ）であり、Ｅ_Ｘは排ガス熱量（Ｗ）である。なお、上記の室外機総熱交換量Ｑは、室外機熱交換器２３の放熱量Ｅ_ＣＤとラジエーター２５の放熱量Ｅ_Ｒとの合計量である。また、ガス消費量Ｅ_ＩＧは、ガスエンジン２１で消費されたガス量から導出することができ、排ガス熱量Ｅ_Ｘは、排気ガス熱交換器２４から排出される排気ガスの熱量から導出することができる。 The outdoor unit production heat quantity deriving unit 112 derives the outdoor unit production heat quantity by equation (3).

Here, E _P is the heat produced by the outdoor unit (W), E _CD is the heat _release amount (W) of the outdoor unit heat exchanger 23, E _IG is the gas consumption (W), and E _R is a radiator a heat radiation amount of 25 (W), _{E X} is exhaust heat (W). Note that the outdoor unit total heat exchange rate Q of the above, the total amount of the heat radiation amount E _R of the heat radiation amount E _CD and radiator 25 of the outdoor unit heat exchanger 23. The gas consumption E _IG may be derived from the amount of gas consumed by the gas engine 21, the exhaust gas heat E _X is be derived from heat of the exhaust gas discharged from the exhaust gas heat exchanger 24 it can.

According to (3), the power of the compressor 22 is derived by subtracting the heat radiation amount E _R and the exhaust gas heat E _X radiator 25 from gas consumption E _IG, heat radiation amount of the outdoor unit heat exchanger 23 E _CD from the by subtracting the power of the compressor 22, the outdoor unit producing heat E _P produced by the outdoor unit _10, i.e., cooling heat that is output from the indoor unit heat exchanger 31 is derived.

ここで、Ｅ_ＩＥは、電力消費量（Ｗ）であり、本実施形態においては室外機モータ２７および室内機モータ３３の電力消費量が主である。 Then, COP derivation unit 114 derives the COP by and (4) using the derived outdoor unit produced heat _{E P.}

Here, E _IE is the power consumption (W), and in the present embodiment, the power consumption of the outdoor unit motor 27 and the indoor unit motor 33 is the main.

  As described above, the performance evaluation apparatus 100 arranges the junction 120 of the upstream thermocouple 103 for each grid 160 on the upstream side of the outdoor unit heat exchanger 23, and arranges the downstream thermocouple 104 at the air outlet 29b of the housing 29. did. Then, the temperature difference between the upstream average temperature measured by the upstream thermocouple 103 and the downstream average temperature measured by the downstream thermocouple 104 is weighted based on the wind speed ratio for each grid 160 derived in advance and weighted. Based on the weighted average temperature difference T and the wind speed measured by the wind speed sensor 105, the outdoor unit total heat exchange amount Q is derived. As a result, it is not necessary to arrange a thermocouple downstream of each grid 160 of the outdoor unit heat exchanger 23, the installation of the measuring device becomes easy, and performance evaluation can be performed more easily than in the past.

  In particular, in the prior art, when arranging a thermocouple for each grid 160 downstream of the outdoor unit heat exchanger 23, a custom sheathed thermocouple with a diameter smaller than the pitch of the fins of the outdoor unit heat exchanger 23 is used. It is necessary to prepare, and a highly advanced installation technique for arranging a sheath thermocouple downstream of the outdoor unit heat exchanger 23 is required. On the other hand, in the performance evaluation apparatus 100, since there is no such need, performance evaluation can be performed at low cost, and installation work can be simplified.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. It is understood.

ここで、Ｅ_ＴはＥＨＰのコンプレッサの消費電力（Ｗ）である。 For example, in the above-described embodiment, the performance evaluation of the GHP 10 is performed, but not limited to this, the performance evaluation of an EHP (electric motor heat pump air conditioner) may be performed. When evaluating the performance of EHP, the equations (5) and (6) are used instead of the equations (3) and (4).

Here, _{E T} is the power consumption of the compressor EHP (W).

  Further, in the above embodiment, thermocouples (upstream thermocouple 103, downstream thermocouple 104) are adapted as temperature sensors (upstream temperature sensor, downstream temperature sensor), but the invention is not limited thereto. A temperature sensor, such as a thermistor or the like may be adapted.

  In the above embodiment, the junction point 120 of the upstream thermocouple 103 is disposed for each grid 160. However, if there is no temperature distribution on the upstream side of the outdoor unit heat exchanger 23, the grid division is not performed 1 Only one junction point 120 may be arranged.

In the above embodiment, (1) and (2) by equation outdoor unit total heat exchange rate as the total amount of the heat radiation amount E _R of the heat radiation amount E _CD and radiator 25 of the outdoor unit heat exchanger 23 Q Although so as to derive, not limited to this, if it is possible to derive separate heat radiation amount E _R radiator 25, (1) and (2), the heat radiation amount of the outdoor unit heat exchanger 23 E _CD Alternatively, the outdoor unit total heat exchange amount Q may be derived.

The present invention can be used for a heat release amount deriving device that performs performance evaluation of an air conditioner that air-conditions the room.

10 GHP (air conditioner)
23 outdoor unit heat exchanger (heat exchanger)
100 Performance evaluation device 103 upstream thermocouple (upstream temperature sensor)
104 downstream thermocouple (downstream temperature sensor)
105 Wind speed sensor 110 Heat exchanger heat release amount derivation part

Claims (2)

Is arranged measurement points in each grid is divided into Oite plurality on the upstream side of the heat exchanger provided in an outdoor unit of an air conditioning apparatus, measuring the upstream average temperature of the upstream temperature were averaged measured by said measurement point Upstream temperature sensor,
A downstream temperature sensor that measures an average temperature of air discharged from the outdoor unit as a downstream average temperature;
A wind speed sensor that measures the wind speed of air discharged from the outdoor unit;
And wind speed previously measured the upstream side of each of the grid, based on the wind speed ratio of the wind speed measured by the wind velocity sensor, wherein the upstream average temperature measured by the upstream temperature sensor, by the downstream temperature sensor A heat exchanger that weights the temperature difference with the measured downstream average temperature for each grid and derives the heat release amount of the heat exchanger based on the weighted temperature difference and the wind speed measured by the wind speed sensor A heat release amount deriving unit,
A heat release amount deriving device comprising: The upstream temperature sensor is a thermocouple in which a pair of thermocouple wires made of different metals are joined at a junction point, the junction point is disposed for each grid of the heat exchanger, and the plurality of junctions The lengths of the thermocouple wires of at least the same metal joined to each other are identical to one another,
The discharge according to claim 1 , wherein each thermocouple wire has one end joined to one of the junctions and the other end coupled to the other end of the other same metal thermocouple wire. Heat output device.

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