WO2013008753A1 - Capteur d'humidité - Google Patents

Capteur d'humidité Download PDF

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Publication number
WO2013008753A1
WO2013008753A1 PCT/JP2012/067348 JP2012067348W WO2013008753A1 WO 2013008753 A1 WO2013008753 A1 WO 2013008753A1 JP 2012067348 W JP2012067348 W JP 2012067348W WO 2013008753 A1 WO2013008753 A1 WO 2013008753A1
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WO
WIPO (PCT)
Prior art keywords
heat
heat absorption
transfer member
temperature
heat transfer
Prior art date
Application number
PCT/JP2012/067348
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English (en)
Japanese (ja)
Inventor
多久島　朗
Original Assignee
ステラグリーン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ステラグリーン株式会社 filed Critical ステラグリーン株式会社
Publication of WO2013008753A1 publication Critical patent/WO2013008753A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
    • G01N25/68—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point by varying the temperature of a condensing surface

Definitions

  • the present invention relates to a humidity sensor using the heat absorption effect of a Peltier element.
  • a main body portion that is arranged in a space to be measured and is configured to enclose a working fluid and cause a heat pipe phenomenon, and heat insulation that is externally fitted to the main body portion.
  • Part and the base side part which becomes one side with respect to the heat insulation part of the main body part, and the gaseous state evaporated in the front side part which is the other side with respect to the heat insulation part of the main body part
  • a humidity sensor is disclosed that includes a cooling unit that condenses the working fluid.
  • the heat absorption part of the Peltier element is used as the cooling part, the cooling capacity of the Peltier element is controlled, and the outer surface temperature of the part where the working fluid of the main body evaporates and the part where the gaseous working fluid condenses It is disclosed that the difference is set so as to be a temperature difference at which the heat pipe phenomenon occurs completely.
  • the humidity sensor disclosed in Patent Document 1 has a simplified structure in that it eliminates the need for a wick that wraps the sensitive part of a wet bulb thermometer, and is excellent in maintainability.
  • the humidity sensor disclosed in Patent Document 1 is not configured such that the Peltier element directly generates water droplets from moisture contained in the space to be measured. As described above, the humidity sensor disclosed in Patent Document 1 has a problem that the humidity measurement tends to be inaccurate depending on the space to be measured.
  • the humidity sensor disclosed in Patent Document 1 needs to confirm the aggregation of the gaseous working fluid sealed inside the main body, that is, confirm the phase change of the gas inside the closed space from the outside of the closed space. Therefore, there is a problem that humidity measurement cannot be performed quickly.
  • the object of the present invention has been made in view of the above-mentioned problems of the prior art.
  • the object of the present invention is to measure the relative humidity of the space to be measured quickly and accurately while having a simple structure. Is to provide a simple humidity sensor.
  • a humidity sensor includes a Peltier element, a heat transfer member provided independently on a heat dissipation side and a heat absorption side of the Peltier element, the Peltier element, and a heat transfer member on the heat dissipation side, A measurement space temperature measuring means that is provided separately from the heat transfer member on the heat absorption side and measures the temperature of the measurement space, and a surface temperature on the heat absorption side that measures the temperature in the vicinity of the surface of the heat transfer member on the heat absorption side.
  • Measuring means condensation detection means for determining the presence or absence of condensation on the surface of the heat transfer member on the heat absorption side; temperature of the space to be measured; surface temperature of the heat transfer member on the heat absorption side; And a humidity calculating unit that calculates a relative humidity of the space to be measured based on a determination signal from the dew condensation detection means.
  • the humidity sensor described above is configured such that the Peltier element generates water droplets directly from the moisture contained in the space to be measured. Therefore, even if ventilation, flooding, water supply, or the like is performed in the space where the humidity sensor of the present invention is installed, the humidity of the measurement target space can be accurately measured with high responsiveness.
  • the “near the surface of the heat transfer member on the heat absorption side” means at least one of “the surface of the heat transfer member on the heat absorption side” and “the space close to the surface of the heat transfer member on the heat absorption side”. .
  • the humidity sensor stops the operation of the Peltier element based on the determination signal from the dew condensation detection unit, and the surface temperature of the heat transfer member on the heat absorption side is An operation control unit that performs control to resume the operation of the Peltier element after elapse of a predetermined time after reaching the threshold value or more can be provided. According to the humidity sensor having this configuration, the humidity of the space can be measured more accurately.
  • the humidity sensor includes a rising temperature and a drying temperature that satisfy the following conditions (a) and (b) obtained by experiment: It can be configured to be time. (a) an elevated temperature necessary for drying the dew condensation detection means and a drying time at the temperature until the dew condensation detection means recovers to a state in which dew condensation can be detected; (b) The rising temperature necessary for drying the condensation on the surface of the heat transfer member on the heat absorption side and the drying time at the temperature.
  • the humidity sensor having this configuration since the control in consideration of the relationship between the temperature of the space to be measured and the relative humidity can be finely performed on the Peltier element, accurate measurement of the humidity in the space can be performed. It can be suitably performed.
  • the humidity sensor according to an embodiment of the present invention is configured such that the heat insulating member is a heat transfer member on the heat absorption side so that at least a portion where the presence or absence of condensation is determined by the condensation detection unit is exposed.
  • the heat absorption side surface temperature measuring means is provided between the heat insulating member and the heat absorption side heat transfer member formed on the surface. According to the humidity sensor of this configuration, it is difficult for condensation to occur on and near the surface temperature measuring means on the heat absorption side, so that the temperature on the heat absorption side of the Peltier element can be accurately measured.
  • the humidity sensor according to an embodiment of the present invention is configured such that the surface temperature measuring means on the heat absorption side has a dew drop path or flow path formed on the surface of the heat transfer member on the heat absorption side. It is possible to adopt a configuration provided in close proximity. According to the humidity sensor having this configuration, the dew point temperature can be accurately measured. That is, in order to cause dew condensation, it is necessary to set the temperature on the heat absorption side of the Peltier element to be lower than the original “dew point temperature”, while the temperature of the condensed water droplet is the heat absorption of the Peltier element when dew condensation occurs. A slight temperature difference occurs from the exact “dew point temperature” in order to follow the temperature on the side.
  • the temperature sensor of the present invention having the above-described configuration, it is possible to measure the temperature of the air in the vicinity of the condensation instead of measuring the temperature of the condensed water droplet itself.
  • the original “dew point temperature” can be measured accurately and accurately.
  • the humidity sensor according to an embodiment of the present invention may be configured such that the surface temperature measuring means on the heat absorption side is provided on a heat insulating member formed at the lower end of the exposed portion. it can.
  • the surface temperature measuring means on the endothermic side is arranged as close as possible to the dropping path or flow path of the condensed water droplet formed on the surface of the heat transfer member on the endothermic side.
  • a simple structure can be provided.
  • the humidity sensor according to one embodiment of the present invention generates water droplets directly from the moisture contained in the space to be measured by the Peltier element, and the dew condensation detection means on the surface of the heat transfer member on the heat absorption side of the Peltier element. It is configured to directly determine the presence or absence of condensation. For this reason, the humidity sensor according to the embodiment of the present invention can provide a humidity sensor that can measure the relative humidity of the space to be measured quickly and accurately, while having a simple structure.
  • the humidity sensor according to the embodiment of the present invention stops the operation of the Peltier element based on the determination signal from the dew condensation detection means, and the surface temperature of the heat transfer member on the heat absorption side reaches a threshold value or more. Then, it can be configured to perform control to resume the operation of the Peltier element after a predetermined time has elapsed.
  • the humidity sensor which concerns on one Embodiment of this invention can measure the humidity of the space of a measuring object more correctly.
  • the threshold value and the predetermined time based on experimental support, finely control the Peltier element in consideration of the relationship between the temperature of the space to be measured and its relative humidity. Can do. For this reason, the humidity sensor which concerns on one Embodiment of this invention can perform the exact measurement of the humidity of the space of a measuring object suitably.
  • the humidity sensor according to an embodiment of the present invention can be configured to measure the temperature of air in the vicinity of dew condensation, and thus measures a temperature very close to the original or accurate “dew point temperature”. be able to.
  • Embodiment 1 the humidity sensor of the present invention will be specifically described based on the following Embodiment 1.
  • the embodiment shown below is an example of the embodiment of the present invention, and the present invention is limited to these embodiments. Is not to be done.
  • the humidity sensor measures the relative humidity in the measurement space S, and includes a Peltier element 1, a thermometer 2, a heat absorption side thermometer 3, and a dew condensation detection sensor 4. , A humidity calculator 5, an operation controller 6, and a power source 7.
  • the heat dissipation side and the heat absorption side of the Peltier element 1 are arranged separately in direct contact with the heat transfer members 11 and 12, respectively.
  • these heat transfer members it is preferable to use those made of a material having good thermal conductivity such as copper or aluminum.
  • the thermometer 2 is a means for measuring the temperature in the space S to be measured and is not particularly limited, and a temperature sensor such as a thermocouple or an infrared radiation thermometer can be used. Further, the number of thermometers shown in FIG. 1 is one, but two or more thermometers may be provided in the space S to be measured. In this case, the average of the temperatures measured at each measurement point in the measured space S can be defined as the temperature in the measured space S where the relative humidity is calculated. Further, when the space in the measured space S is wide, a temperature sensor is provided for each different point in the measured space S, and only the temperature sensor that exists only in the vicinity where the temperature is desired to be measured is operated. In this way, even if the temperature in the measured space S is unevenly distributed, the average of the temperatures observed at each point in the region subject to temperature control and humidity control Can also be defined as the temperature in the space S to be measured.
  • the heat absorption side thermometer 3 is a means for measuring the surface temperature of the heat transfer member 12 on the heat absorption side, and is not particularly limited.
  • a temperature sensor such as a thermocouple or an infrared radiation thermometer can be used.
  • FIG. 1 shows a structure in which one heat absorption side thermometer 3 is provided on the surface of the heat transfer member 12, but two or more heat absorption side thermometers 3 are provided on the surface of the heat transfer member 12. Alternatively, it can be provided in the vicinity and temperature can be measured simultaneously or selectively.
  • the condensation detection sensor 4 is not particularly limited as long as it is a condensation detection means for determining the presence or absence of condensation on the surface of the heat transfer member 12 on the heat absorption side, and can detect condensation.
  • the condensation sensor can be exemplified by three types of electric resistance type, crystal vibration type, and optical type, and any type can be used.
  • the humidity calculation unit 5 is connected to the thermometer 2, the heat absorption side thermometer 3, and the dew condensation detection sensor 4. In addition, the humidity calculation unit 5 stores a database of saturated water vapor amounts contained in the atmosphere as a function of temperature and atmospheric pressure. Then, when the dew condensation detection sensor 4 issues a signal notifying the presence of water droplets, the temperature (T s ) in the measured space S detected by the thermometer 2 and the endotherm detected by the heat absorption side thermometer 3. Based on the surface temperature (T p ) of the heat transfer member 12 on the side, it has a function of calculating the relative humidity RH (%) by the following calculation.
  • RH (%) m wmax (T p ) / m wmax (T s ) ⁇ 100 (Equation 1)
  • m wmax (T p ) is the amount of saturated water vapor contained in the atmosphere at T p ° C
  • m wmax (T s ) represents the amount of saturated water vapor contained in the air at T s ° C. That is, when the atmosphere in the measured space S is condensed on the heat transfer member 12 having the surface temperature T p , the dew point temperature of the atmosphere in the space S is about the temperature T p , and the water vapor contained in this atmosphere the amount is considered to be equal to the amount of saturated steam at this temperature T p.
  • the operation control unit 6 is connected to the humidity calculation unit 5, and the result of the determination process (S 12) for the presence or absence of water droplets detected by the dew condensation detection sensor 4 and the heat absorption side heat transfer detected by the heat absorption side thermometer 3. Based on the surface temperature (T p ) of the member 12, the Peltier device 1 is driven according to the flowchart shown in FIG. 2 (S10).
  • the operation control unit 6 determines whether to stop the operation of the Peltier element or to keep driving based on the signal from the dew condensation detection sensor 4 (S12). Here, if there is a determination signal “condensation”, the operation control unit 6 immediately stops the operation of the Peltier element (S13).
  • the surface temperature (T p ° C) when dew condensation occurs on the surface of the heat transfer member 12 on the heat absorption side is considered to be equal to or lower than the dew point temperature of the atmosphere in the measured space S. Therefore, if the surface of the heat transfer member 12 on the heat absorption side has been heated for a predetermined time above the temperature T p ° C when the condensation has occurred, the surface of the heat transfer member 12 on the heat absorption side will be Considered dry.
  • the operation control unit 6 determines whether or not the temperature of the surface of the heat transfer member 12 on the heat absorption side has reached or exceeded the threshold temperature (T c ° C) (S14). When the surface temperature of the heat transfer member 12 on the heat absorption side has reached or exceeded the threshold temperature (T c ° C), power is supplied from the power source 7 to resume the operation of the Peltier element 1 after a predetermined time (t 0 ) has elapsed. Is supplied (S15). Thereafter, the operation control unit 6 repeatedly performs the above-described operation or determinations S12 to S15.
  • a determination process is performed to determine whether or not the surface temperature of the heat transfer member 12 on the heat absorption side is equal to or higher than the threshold temperature (T c ° C). If it is determined that the operation is not performed, the operation control unit 6 performs control (S10) to drive the Peltier element 1 again based on the signal from the dew condensation detection sensor 4, or control to stop the operation of the Peltier element ( Processing for determining whether or not to perform S13) is performed (S12).
  • the threshold temperature T c and the predetermined time t 0 are temperatures obtained by experiments, and are preferably determined so as to satisfy the following criteria.
  • the rising temperature ⁇ T 1 necessary for drying the dew condensation detection sensor 4 and the drying time t 1 at the temperature (the surface temperature T p + ⁇ T 1 );
  • ⁇ T 1 and ⁇ T 2 are not necessarily equal to each other.
  • the larger rising temperature of ⁇ T 1 and ⁇ T 2 is expressed as “temperature T s ° C. in the measured space S and surface temperature T p ° C of the heat transfer member 12 on the heat absorption side“ It is preferable to adopt as “a rise temperature ⁇ T 0 ” ”required for drying the surface of the heat transfer member 12. That is, the threshold temperature T c can be defined as the sum of the surface temperature T p and ⁇ T 0 when condensation occurs.
  • the generation and disappearance of the condensation of the atmosphere in the measurement space S is different depending on the surface temperature of the heat transfer member 12 of the temperature and the heat absorption side of the measured space S, the temperature rise [Delta] T 0 of the the "measured It is preferably determined experimentally as a function of “temperature in the space S” and “surface temperature of the heat transfer member 12 on the heat absorption side”.
  • the predetermined time t 0 is preferably determined experimentally as a function of “temperature in the space to be measured S” and “surface temperature of the heat transfer member 12 on the heat absorption side”.
  • the heat absorption side thermometer 3 is provided on the heat transfer member 12 on the heat absorption side in an exposed state.
  • a part of the heat transfer member 12 on the heat absorption side is exposed to ensure the function of the dew condensation detection sensor 4, while the exposed portion of the heat transfer member 12 is limited.
  • FIG. 5 is a schematic diagram of a configuration example in which the humidity sensor shown in FIG. 1 is installed in the rainproof / windproof case 20.
  • the rainproof and windproof case 20 includes a bottom plate 21 in which at least one hole is formed to ensure good ventilation, a side wall 22 surrounding the bottom plate 21, a top wall 24 provided above the side wall 22, A roof portion 23 covering the upper wall 24 and a blower fan 25 inside the side wall 22 are provided.
  • a clearance 24 a is provided between the upper wall 24 and the roof portion 23, and the blower fan 25 introduces outside air into the rainproof / windproof case 20 from the clearance 24 a to prevent the air.
  • Air in the rain windproof case 20 is blown from the upper side to the lower side.
  • the direction of the wind is not limited as long as a fine wind of more than 0 to about 2 m / sec can be supplied into the rainproof / windproof case 20, and the air may be blown from the lower side to the upper side.
  • the bottom plate 21 has a structure capable of supplying a fine wind of 0 to about 2 m / sec into the rainproof / windproof case 20 without imposing an excessive burden on the blower fan 25, the shape and size of the hole,
  • the number of holes is not limited. Further, in FIG. 5, no hole is formed in the side wall 22, but as long as it has a function to prevent rainwater, sprinkler and mist (fog) spray from entering the rainproof windproof case 20, As shown in FIG. 6, the side wall 22 can be configured in a structure having ventilation.
  • the material of the bottom plate 21, the side wall 22, the roof portion 23, and the upper wall 24 is not particularly limited as long as the humidity sensor can quickly and accurately measure the relative humidity of the space to be measured.
  • a heat insulating material such as resin or wood, a transparent acrylic plate, a metal plate, porous ceramics, or the like can be used.
  • the humidity sensor according to the second embodiment includes a Peltier element 1, a thermometer 2, a heat absorption side thermometer 3, a dew condensation detection sensor 4, a humidity calculation unit 5, an operation control unit 6, and a power source 7.
  • the device has the same function as the corresponding device in the first embodiment.
  • the Peltier element 1 of the humidity sensor according to the second embodiment the heat transfer member 12 on the heat absorption side is covered with the heat insulating material 13 and directed downward, and the tip portion is narrowed in the vertical direction.
  • the surface a inclined at an angle ⁇ is exposed to the outside.
  • the function of the heat absorption function of the Peltier element 1 is not impaired, and the atmosphere in the measured space S is sufficiently cooled. can do.
  • the heat absorption side thermometer 3 is formed at the lower end of the exposed surface 12a so as to be close to the flow path of the condensation generated on the exposed surface 12a at the tip of the heat transfer member 12. It is provided on the heat insulating member 13a. Further, a through hole 13b is formed in the heat insulating member 13a so that the heat absorption side thermometer 3 is not wetted by water droplets condensed on the exposed surface 12a, and water droplets condensed on the exposed surface 12a pass through the through hole 13b. The flow path is secured so as to drip downward.
  • the endothermic thermometer 3 is configured to measure the temperature of the air in the vicinity of dew condensation, so that the temperature extremely close to the original or accurate “dew point temperature” is set. Can be measured.
  • FIG. 6 is a schematic diagram of a configuration example in which the humidity sensor according to the second embodiment is installed in the rainproof / windproof case 20.
  • the rain / windproof case 20 includes a bottom plate 21 having at least one hole formed therein to ensure good ventilation, a side wall 22 having ventilation that surrounds the bottom plate 21, and a roof provided above the side wall 22. Part 23.
  • the rainproof and windproof case 20 shown in FIG. 6 has a structure in which a blower fan is omitted, and is formed by vertically connecting partition plates 22a whose outer edges are inclined downward at predetermined intervals. It has a side wall 22. Between the partition plates 22 a adjacent to the upper and lower sides of the side wall 22, an opening 22 b for introducing air into the rainproof / windproof case 20 is formed. As described above, the side wall 22 in FIG. 6 prevents the rainwater from the lateral direction and the water from sprinkler or mist (mist) injection from entering the rainproof / windproof case 20 while keeping the outside air inside the rainproof / windproof case 20. And has a structure that prevents the trapped air from staying outside.
  • the rainproof / windproof case 20 shown in FIG. 7 is configured so that air having speed and water droplets does not come into direct contact with the inclined heat absorption side of the Bercher element 1. Since the humidity in the air propagates by diffusion, it is not necessary for outside air with a flow velocity to directly contact the Bercher element, and the main flow of air flows away from the heat absorption portion in this way, so that the heat absorption portion depends on the flow velocity. Condensation is not blown off, and conversely, no water droplets adhere to the heat absorption part.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Analytical Chemistry (AREA)
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  • General Physics & Mathematics (AREA)
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  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

La présente invention vise à fournir un capteur d'humidité qui présente une structure simple mais est toujours apte à mesurer de façon rapide et précise l'humidité relative d'un espace à mesurer. Un capteur d'humidité de la présente invention comporte : un élément Peltier ; des éléments de transfert de chaleur qui sont indépendamment disposés sur le côté dissipation de chaleur et sur le côté absorption de chaleur de l'élément Peltier ; un moyen de mesure de température d'espace qui est agencé séparé de l'élément Peltier, de l'élément de transfert de chaleur côté dissipation de chaleur et de l'élément de transfert de chaleur côté absorption de chaleur, et qui mesure la température d'un espace à mesurer ; un moyen de mesure de température de surface côté absorption de chaleur qui mesure la température au voisinage de la surface de l'élément de transfert de chaleur côté absorption de chaleur ; un moyen de détection de condensation de buée qui détermine la présence ou l'absence de condensation de buée sur la surface de l'élément de transfert de chaleur côté absorption de chaleur ; et une unité de calcul d'humidité qui calcule l'humidité relative de l'espace à mesurer sur la base de la température de l'espace à mesurer, de la température de surface de l'élément de transfert de chaleur côté absorption de chaleur et du signal de détermination à partir du moyen de détection de condensation de buée.
PCT/JP2012/067348 2011-07-13 2012-07-06 Capteur d'humidité WO2013008753A1 (fr)

Applications Claiming Priority (2)

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JP2011-155255 2011-07-13
JP2011155255 2011-07-13

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WO2013008753A1 true WO2013008753A1 (fr) 2013-01-17

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015527256A (ja) * 2012-09-07 2015-09-17 ルノー エス．ア．エス． 自動車の後部フォグライトの制御の方法および装置
USD792248S1 (en) 2016-01-12 2017-07-18 Paul Lagana Digital outdoor thermometer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5817349A (ja) * 1981-07-23 1983-02-01 Meidensha Electric Mfg Co Ltd 結露防止装置
JPS6175235A (ja) * 1984-09-20 1986-04-17 Rikagaku Kenkyusho 露点検出器
JP2000283938A (ja) * 1998-11-13 2000-10-13 General Electric Co <Ge> 露点センサー
JP2001281182A (ja) * 2000-03-30 2001-10-10 Tokyo Electric Power Co Inc:The 湿度検出装置
JP2006284485A (ja) * 2005-04-04 2006-10-19 Yamatake Corp 鏡面冷却式センサ
WO2008123313A1 (fr) * 2007-04-04 2008-10-16 Espec Corp. Hygromètre, et instrument de point de rosée
JP2009050376A (ja) * 2007-08-24 2009-03-12 Ngk Spark Plug Co Ltd 温度調節機能付き鏡、露点計、及び湿度センサ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5817349A (ja) * 1981-07-23 1983-02-01 Meidensha Electric Mfg Co Ltd 結露防止装置
JPS6175235A (ja) * 1984-09-20 1986-04-17 Rikagaku Kenkyusho 露点検出器
JP2000283938A (ja) * 1998-11-13 2000-10-13 General Electric Co <Ge> 露点センサー
JP2001281182A (ja) * 2000-03-30 2001-10-10 Tokyo Electric Power Co Inc:The 湿度検出装置
JP2006284485A (ja) * 2005-04-04 2006-10-19 Yamatake Corp 鏡面冷却式センサ
WO2008123313A1 (fr) * 2007-04-04 2008-10-16 Espec Corp. Hygromètre, et instrument de point de rosée
JP2009050376A (ja) * 2007-08-24 2009-03-12 Ngk Spark Plug Co Ltd 温度調節機能付き鏡、露点計、及び湿度センサ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015527256A (ja) * 2012-09-07 2015-09-17 ルノー エス．ア．エス． 自動車の後部フォグライトの制御の方法および装置
USD792248S1 (en) 2016-01-12 2017-07-18 Paul Lagana Digital outdoor thermometer

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