JP2016205880A - Co2 sensor diagnosis device and method - Google Patents

Co2 sensor diagnosis device and method Download PDF

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JP2016205880A
JP2016205880A JP2015084779A JP2015084779A JP2016205880A JP 2016205880 A JP2016205880 A JP 2016205880A JP 2015084779 A JP2015084779 A JP 2015084779A JP 2015084779 A JP2015084779 A JP 2015084779A JP 2016205880 A JP2016205880 A JP 2016205880A
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JP6484095B2 (en
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和明 白根
Kazuaki Shirane
和明 白根
清治 臼井
Kiyoharu Usui
清治 臼井
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Azbil Corp
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Abstract

PROBLEM TO BE SOLVED: To enable the extent of drift occurrence in the output of a COsensor to be diagnosed.SOLUTION: A COsensor diagnosis device 20 comprises: a COconcentration measured value acquisition unit 21 for acquiring a COconcentration measured value from a plurality of COsensors, and finding the minimum value of COconcentration measured values in a prescribed period for each sensor; a COconcentration classification unit 22 for classifying the minimum value of COconcentration measured values of each COsensor into a plurality of COconcentration ranges based on a predetermined COconcentration value; and a sensor diagnosis unit 23 for diagnosing the extent of drift occurrence in the output of each COsensor from the result of classification by the COconcentration classification unit 22.SELECTED DRAWING: Figure 2

Description

本発明は、ＣＯ2センサの状態を診断する技術に係り、特にＣＯ2センサの出力のドリフト発生の程度を診断することが可能なＣＯ2センサ診断装置および方法に関するものである。 The present invention relates to a technique for diagnosing the state of the CO 2 sensor, to a CO 2 sensor diagnostic system and method which can particularly diagnosing the extent of drift occurrence of the output of the CO 2 sensor.

ＣＯ2センサは、経時変化によって出力がドリフトする傾向にある。そのため、ＣＯ2の発生源がないときのＣＯ2濃度（およそ４００ｐｐｍ）をベースラインとして、ＣＯ2センサのドリフトを補正する方法が知られている（特許文献１参照）。 In the CO 2 sensor, the output tends to drift with time. Therefore, a method of correcting the drift of the CO 2 sensor using the CO 2 concentration (approximately 400 ppm) when there is no CO 2 generation source as a baseline is known (see Patent Document 1).

特開２０１４−１１５１７５号公報JP, 2014-115175, A

特許文献１に開示された技術では、制御対象空間に外気を積極導入し、ＣＯ2濃度測定値が一定時間連続して基準値±αの範囲内になるようにして、ＣＯ2センサの出力のドリフトを補正している。 The disclosed in Patent Document 1 technology, controls the outside air actively introduced into the space, as the CO 2 concentration measured value is within the range of the reference value ± alpha consecutively a predetermined time, the output of the CO 2 sensor The drift is corrected.

しかし、特許文献１に開示された技術では、建物内に複数のＣＯ2センサが設置されている状況で、上記のようにドリフトの補正を行ったとしても、どのＣＯ2センサの出力が、どの程度ドリフトしているのか、といったことを判断することはできないという問題点があった。 However, in the technique disclosed in Patent Document 1, even if the drift is corrected as described above in a situation where a plurality of CO 2 sensors are installed in a building, the output of which CO 2 sensor is There was a problem that it was not possible to judge whether it was drifting to a certain extent.

本発明は、上記課題を解決するためになされたもので、ＣＯ2センサの出力のドリフト発生の程度を診断することが可能なＣＯ2センサ診断装置および方法を提供することを目的とする。 The present invention has been made to solve the above problems, and an object thereof is to provide a CO 2 sensor diagnostic apparatus and method capable of diagnosing the extent of drift occurrence of the output of the CO 2 sensor.

本発明のＣＯ2センサ診断装置は、施設に設けられた複数のＣＯ2センサからＣＯ2濃度測定値を取得して、所定期間におけるＣＯ2濃度測定値の最小値をセンサ毎に求めるＣＯ2濃度測定値取得手段と、このＣＯ2濃度測定値取得手段が求めた各ＣＯ2センサのＣＯ2濃度測定値の最小値を、予め定められたＣＯ2濃度値を基準にした複数のＣＯ2濃度範囲に分類するＣＯ2濃度分類手段と、このＣＯ2濃度分類手段による分類結果から各ＣＯ2センサの出力のドリフト発生の程度を診断するセンサ診断手段とを備えることを特徴とするものである。
また、本発明のＣＯ2センサ診断装置の１構成例において、前記予め定められたＣＯ2濃度値は、外気のＣＯ2濃度値である。 CO 2 sensor diagnostic system of the present invention, a plurality of CO 2 sensor provided in the facility to obtain a CO 2 concentration measurements, the CO 2 concentration to obtain the minimum value of the CO 2 concentration measurements in a predetermined period for each sensor The measured value acquisition means and the minimum value of the CO 2 concentration measurement value of each CO 2 sensor obtained by the CO 2 concentration measurement value acquisition means are a plurality of CO 2 concentration ranges based on a predetermined CO 2 concentration value. and CO 2 concentration classifying means for classifying the and is characterized by comprising a sensor diagnostic unit for diagnosing the extent of drift occurrence of the output of the CO 2 sensor from the classification result by the CO 2 concentration classification means.
Additionally, in an example of the CO 2 sensor diagnostic system of the present invention, the CO 2 concentration value set in advance is the outside air CO 2 concentration value.

また、本発明のＣＯ2センサ診断方法は、施設に設けられた複数のＣＯ2センサからＣＯ2濃度測定値を取得して、所定期間におけるＣＯ2濃度測定値の最小値をセンサ毎に求めるＣＯ2濃度測定値取得ステップと、このＣＯ2濃度測定値取得ステップで求めた各ＣＯ2センサのＣＯ2濃度測定値の最小値を、予め定められたＣＯ2濃度値を基準にした複数のＣＯ2濃度範囲に分類するＣＯ2濃度分類ステップと、このＣＯ2濃度分類ステップによる分類結果から各ＣＯ2センサの出力のドリフト発生の程度を診断するセンサ診断ステップとを含むことを特徴とするものである。 Further, the CO 2 sensor diagnosis method of the present invention obtains a CO 2 concentration measurement value from a plurality of CO 2 sensors provided in a facility, and obtains a minimum value of the CO 2 concentration measurement value for a predetermined period for each sensor. and 2 concentration measurement value acquisition step, the CO 2 the minimum value of CO 2 concentration measurement for each CO 2 sensor calculated in the density measurement value acquisition step, a plurality of CO 2 relative to the CO 2 concentration value set in advance A CO 2 concentration classification step for classifying into a concentration range; and a sensor diagnosis step for diagnosing the degree of occurrence of drift in the output of each CO 2 sensor from the classification result of the CO 2 concentration classification step. .

本発明によれば、それぞれのＣＯ2センサの所定期間におけるＣＯ2濃度測定値の最小値に基づいて、どのＣＯ2センサにどの程度の量のドリフトが発生している可能性があるかを把握することが可能となる。また、施設の管理者にとっては、ＣＯ2センサの診断結果から、ＣＯ2センサの点検あるいは交換が必要であることを認識することが可能となるので、ＣＯ2センサの動作不良による省エネルギー効果の損失や、室内環境の悪化に対して早急に対応することができる。 According to the present invention, based on the minimum value of the measured CO 2 concentration during a predetermined period of each CO 2 sensor, it is possible to grasp how much drift is generated in which CO 2 sensor. It becomes possible to do. Further, for the facility manager, the diagnostic result of CO 2 sensor, since inspection or replacement of the CO 2 sensor is able to recognize the need, CO 2 loss energy savings operation due to defective sensors In addition, it is possible to quickly cope with the deterioration of the indoor environment.

本発明の実施の形態に係る空調制御システムの構成を示すブロック図である。It is a block diagram which shows the structure of the air-conditioning control system which concerns on embodiment of this invention. 本発明の実施の形態に係るＣＯ2センサ診断装置の構成を示すブロック図である。The structure of the CO 2 sensor diagnostic apparatus according to an embodiment of the present invention is a block diagram showing. 本発明の実施の形態に係るＣＯ2センサ診断装置の動作を説明するフローチャートである。It is a flowchart for explaining the operation of the CO 2 sensor diagnostic apparatus according to an embodiment of the present invention. ＣＯ2濃度範囲とＣＯ2センサの分類結果の１例を示す図である。Is a view showing an example of a CO 2 concentration range and CO 2 sensors classification results. 本発明の実施の形態におけるセンサ診断部による診断結果と環境評価部による診断結果の１例を示す図である。It is a figure which shows an example of the diagnostic result by the sensor diagnostic part in embodiment of this invention, and the diagnostic result by an environment evaluation part.

以下、本発明の実施の形態について図面を参照して説明する。図１は本発明の実施の形態に係る空調制御システムの構成を示すブロック図である。本実施の形態では、１つの施設内に空調設備１００が例えば階毎に設けられ、各階に制御対象空間がｎ個（ｎは２以上の整数）ある例について説明するが、本発明はこのような例に限るものではなく、ＣＯ2センサが複数個設けられている空調制御システムであれば、様々な構成の空調制御システムに本発明を適用することができる。以下の説明では、１つの空調設備１００について空調動作を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an air conditioning control system according to an embodiment of the present invention. In the present embodiment, an example will be described in which the air conditioning equipment 100 is provided in one facility, for example, for each floor, and there are n control target spaces (n is an integer of 2 or more) on each floor. The present invention is not limited to this example, and the present invention can be applied to an air conditioning control system having various configurations as long as the air conditioning control system includes a plurality of CO 2 sensors. In the following description, the air conditioning operation for one air conditioning facility 100 will be described.

空調設備１００内には、空調機１と、外気ＯＡの空調機１への導入量を制御する外気ダンパ２と、制御対象空間１１−１〜１１−ｎから戻る還気ＲＡの空調機１への導入量を制御する還気ダンパ３と、空調機１の冷水コイルに送る冷水の量を制御する冷水バルブ４と、空調機１の温水コイルに送る温水の量を制御する温水バルブ５と、空調機１の加湿器に送る冷水又は温水の量を制御する加湿バルブ６と、空調機１から送り出される空気（給気ＳＡ）の温度を測定する給気温度センサ７と、制御対象空間１１−１〜１１−ｎの温度を測定する室内温度センサ８−１〜８−ｎと、制御対象空間１１−１〜１１−ｎから戻る還気ＲＡのＣＯ2濃度を測定するＣＯ2センサ９と、制御対象空間１１−１〜１１−ｎの湿度を測定する湿度センサ１０−１〜１０−ｎと、ダンパ２，３とバルブ３，４，５とを制御するコントローラ１２と、ＶＡＶ（Variable Air Volume ）ユニット１３−１〜１３−ｎとが設けられている。空調機１は、フィルター１４と、空気を冷却する冷水コイル１５と、空気を加熱する温水コイル１６と、加湿器１７と、冷却又は加熱された空気を送るファン１８とを備えている。 In the air conditioner 100, the air conditioner 1, the outside air damper 2 that controls the amount of outside air OA introduced into the air conditioner 1, and the return air RA air conditioner 1 that returns from the control target spaces 11-1 to 11-n. A return air damper 3 for controlling the amount of air introduced, a cold water valve 4 for controlling the amount of cold water sent to the cold water coil of the air conditioner 1, a hot water valve 5 for controlling the amount of hot water sent to the hot water coil of the air conditioner 1, A humidifying valve 6 for controlling the amount of cold water or hot water sent to the humidifier of the air conditioner 1, a supply air temperature sensor 7 for measuring the temperature of the air (supply air SA) sent from the air conditioner 1, and a control target space 11- Indoor temperature sensors 8-1 to 8-n for measuring the temperature of 1 to 11-n, CO 2 sensor 9 for measuring the CO 2 concentration of the return air RA returning from the control target spaces 11-1 to 11-n, Humidity sensor 10-1 for measuring the humidity of the control target spaces 11-1 to 11-n 10-n, a controller 12 for controlling the dampers 2, 3 and the valves 3, 4, 5 and VAV (Variable Air Volume) units 13-1 to 13-n are provided. The air conditioner 1 includes a filter 14, a cold water coil 15 that cools air, a hot water coil 16 that heats air, a humidifier 17, and a fan 18 that sends the cooled or heated air.

空調機１の冷水コイル１５は、図示しない熱交換器から冷水バルブ４を介して供給される冷水により外気ＯＡおよび還気ＲＡを冷却する。空調機１の温水コイル１６は、熱交換器から温水バルブ５を介して供給される温水により外気ＯＡおよび還気ＲＡを加熱する。また、熱交換器から送り出された冷水又は温水は、加湿バルブ６を通って加湿器１７に供給される。加湿器１７は、水噴霧状態を作り出すことにより、コイル１５，１６で冷却又は加熱された給気ＳＡの湿度を制御する。コイル１５，１６で冷却又は加熱され加湿器１７で加湿された給気ＳＡは、ファン１８によって制御対象空間１１−１〜１１−ｎに送り出される。制御対象空間１１−１〜１１−ｎの空気の一部は、還気ＲＡとして空調機１に戻される。   The cold water coil 15 of the air conditioner 1 cools the outside air OA and the return air RA with cold water supplied from a heat exchanger (not shown) via the cold water valve 4. The hot water coil 16 of the air conditioner 1 heats the outside air OA and the return air RA with hot water supplied from the heat exchanger via the hot water valve 5. Further, the cold water or hot water sent out from the heat exchanger is supplied to the humidifier 17 through the humidification valve 6. The humidifier 17 controls the humidity of the supply air SA cooled or heated by the coils 15 and 16 by creating a water spray state. The supply air SA cooled or heated by the coils 15 and 16 and humidified by the humidifier 17 is sent out to the control target spaces 11-1 to 11-n by the fan 18. Part of the air in the control target spaces 11-1 to 11-n is returned to the air conditioner 1 as return air RA.

給気温度センサ７は、空調機１から送り出される給気ＳＡの温度を測定する。室内温度センサ８−１〜８−ｎは、制御対象空間１１−１〜１１−ｎの温度を測定する。ＣＯ2センサ９は、制御対象空間１１−１〜１１−ｎから戻る還気ＲＡのＣＯ2濃度を測定する。湿度センサ１０−１〜１０−ｎは、制御対象空間１１−１〜１１−ｎの湿度を測定する。コントローラ１２は、給気ＳＡの温度が所定の給気温度設定値と一致するようにバルブ４，５の開度を制御する。また、コントローラ１２は、ＣＯ2センサ９で測定されたＣＯ2濃度測定値が所定のＣＯ2濃度設定値と一致するように外気ダンパ２の開度を制御する。さらに、コントローラ１２は、複数の湿度センサ１０−１〜１０−ｎで測定された湿度測定値が所定の設定範囲内になるように加湿バルブ６の開度を制御する。 The supply air temperature sensor 7 measures the temperature of the supply air SA sent out from the air conditioner 1. The indoor temperature sensors 8-1 to 8-n measure the temperatures of the control target spaces 11-1 to 11-n. The CO 2 sensor 9 measures the CO 2 concentration of the return air RA returning from the control target spaces 11-1 to 11-n. The humidity sensors 10-1 to 10-n measure the humidity of the control target spaces 11-1 to 11-n. The controller 12 controls the opening degree of the valves 4 and 5 so that the temperature of the supply air SA matches a predetermined supply air temperature setting value. Further, the controller 12 controls the opening degree of the outside air damper 2 so that the measured CO 2 concentration value measured by the CO 2 sensor 9 matches a predetermined CO 2 concentration set value. Furthermore, the controller 12 controls the opening degree of the humidifying valve 6 so that the humidity measurement values measured by the plurality of humidity sensors 10-1 to 10-n are within a predetermined setting range.

ＶＡＶユニット１３−１〜１３−ｎは、制御対象空間１１−１〜１１−ｎの温度が所定の室内温度設定値と一致するように制御対象空間１１−１〜１１−ｎの要求風量を演算して、その要求風量を確保するようにＶＡＶユニット１３−１〜１３−ｎ内のダンパ（不図示）の開度を制御する。コントローラ１２は、複数のＶＡＶユニット１３−１〜１３−ｎから送られてくる要求風量値からシステム全体の総要求風量値を演算し、この総要求風量値に応じたファン回転数を求め、この求めたファン回転数となるように空調機１を制御する。   The VAV units 13-1 to 13-n calculate the required air volume of the control target spaces 11-1 to 11-n so that the temperatures of the control target spaces 11-1 to 11-n match a predetermined indoor temperature setting value. Then, the opening degree of dampers (not shown) in the VAV units 13-1 to 13-n is controlled so as to ensure the required air volume. The controller 12 calculates the total required air volume value of the entire system from the required air volume values sent from the plurality of VAV units 13-1 to 13-n, obtains the fan rotational speed corresponding to the total required air volume value, The air conditioner 1 is controlled so as to obtain the obtained fan rotation speed.

次に、本実施の形態のＣＯ2センサ診断装置２０について説明する。図２はＣＯ2センサ診断装置２０の構成を示すブロック図、図３はＣＯ2センサ診断装置２０の動作を説明するフローチャートである。ＣＯ2センサ診断装置２０は、空調機１毎に設けられた各ＣＯ2センサ９から各空調機１のコントローラ１２を介してＣＯ2濃度測定値を取得して、所定期間におけるＣＯ2濃度測定値の最小値をセンサ毎に求めるＣＯ2濃度測定値取得部２１と、各ＣＯ2センサ９のＣＯ2濃度測定値の最小値を、予め定められたＣＯ2濃度値を基準にした複数のＣＯ2濃度範囲に分類するＣＯ2濃度分類部２２と、ＣＯ2濃度分類部２２による分類結果から各ＣＯ2センサ９の出力のドリフト発生の程度を診断するセンサ診断部２３と、ＣＯ2濃度分類部２２による分類結果から各ＣＯ2センサ９が設置されている制御対象空間の室内環境の良好度および空調のエネルギー消費の良好度を診断する環境評価部２４と、センサ診断部２３による診断結果と環境評価部２４による診断結果とを出力する出力部２５とから構成される。 Next, the CO 2 sensor diagnostic device 20 of the present embodiment will be described. FIG. 2 is a block diagram showing the configuration of the CO 2 sensor diagnostic device 20, and FIG. 3 is a flowchart for explaining the operation of the CO 2 sensor diagnostic device 20. CO 2 sensor diagnostic device 20 acquires the CO 2 concentration measurements from the CO 2 sensor 9 provided for each air conditioner 1 through the controller 12 of the air conditioner 1, the CO 2 concentration measurements in a predetermined period the minimum value and the CO 2 concentration measured value acquisition unit 21 to obtain for each sensor, the minimum value of CO 2 concentration measurement for each CO 2 sensor 9, a plurality of CO 2 that the reference CO 2 concentration value predetermined and the CO 2 concentration classification unit 22 that classifies the concentration range, the sensor diagnostic unit 23 to diagnose the extent of drift occurrence of the output of the CO 2 sensor 9 from the classification result by the CO 2 concentration classification unit 22, the CO 2 concentration classification unit 22 From the result of classification by the environmental evaluation unit 24 for diagnosing the goodness of the indoor environment and the goodness of the energy consumption of the air conditioning in the control target space in which each CO 2 sensor 9 is installed, the diagnosis result by the sensor diagnosis unit 23 and the environmental evaluation Part 2 4 and an output unit 25 that outputs a diagnosis result obtained by 4.

ＣＯ2濃度測定値取得部２１は、空調機１毎に設けられた各ＣＯ2センサ９から各空調機１のコントローラ１２を介してＣＯ2濃度測定値を取得して記憶する（図３ステップＳ１）。なお、ＣＯ2濃度測定値取得部２１は、施設内に設けられた全てのＣＯ2センサ９からＣＯ2濃度測定値を取得するので、施設内に複数の空調機１が設けられている場合には、各空調機１のＣＯ2センサ９からＣＯ2濃度測定値を取得することになる。そして、ＣＯ2濃度測定値取得部２１は、所定期間（例えば、１か月間）におけるＣＯ2濃度測定値の最小値をＣＯ2センサ毎に求める（図３ステップＳ２）。 The CO 2 concentration measurement value acquisition unit 21 acquires and stores the CO 2 concentration measurement value from each CO 2 sensor 9 provided for each air conditioner 1 via the controller 12 of each air conditioner 1 (step S1 in FIG. 3). ). Incidentally, the CO 2 concentration measured value acquisition unit 21, so to obtain the CO 2 concentration measurements from all the CO 2 sensor 9 provided on site, when a plurality of air conditioner 1 is provided on site Will acquire the CO 2 concentration measurement value from the CO 2 sensor 9 of each air conditioner 1. Then, the CO 2 concentration measurement value acquisition unit 21 obtains the minimum value of the CO 2 concentration measurement value for a predetermined period (for example, one month) for each CO 2 sensor (step S2 in FIG. 3).

上述のとおり、ＣＯ2の発生源がないときのＣＯ2濃度は、外気とほぼ同じ４００［ｐｐｍ］近辺になるため、このときのＣＯ2センサ９の濃度測定値もおよそ４００［ｐｐｍ］となるはずである。そこで、本実施の形態では、所定期間におけるＣＯ2センサ９の出力の最小値が、４００［ｐｐｍ］からどの程度乖離しているかを評価指標として、ＣＯ2センサ９の診断を行う。 As described above, the CO 2 concentration when there is no CO 2 generation source is in the vicinity of 400 [ppm] which is substantially the same as that of the outside air, so the measured concentration value of the CO 2 sensor 9 at this time is also approximately 400 [ppm]. It should be. Therefore, in the present embodiment, the CO 2 sensor 9 is diagnosed using as an evaluation index how much the minimum value of the output of the CO 2 sensor 9 during a predetermined period deviates from 400 [ppm].

ＣＯ2濃度分類部２２は、ＣＯ2濃度測定値取得部２１が求めた各ＣＯ2センサ９のＣＯ2濃度測定値の最小値を、予め定められた複数のＣＯ2濃度範囲に分類する（図３ステップＳ３）。図４はＣＯ2濃度範囲とＣＯ2センサ９の分類結果の１例を示す図である。ここでは、予め定められたＣＯ2濃度範囲が４つあり、施設内にＣＯ2センサ９が合計で１４個ある場合について示している。 The CO 2 concentration classification unit 22 classifies the minimum value of the CO 2 concentration measurement value of each CO 2 sensor 9 obtained by the CO 2 concentration measurement value acquisition unit 21 into a plurality of predetermined CO 2 concentration ranges (see FIG. 3 step S3). FIG. 4 is a diagram showing an example of the CO 2 concentration range and the classification result of the CO 2 sensor 9. Here, there is shown a case where there are four predetermined CO 2 concentration ranges and a total of 14 CO 2 sensors 9 in the facility.

次に、センサ診断部２３は、ＣＯ2濃度分類部２２による分類結果から各ＣＯ2センサ９の出力のドリフト発生の程度を診断する（図３ステップＳ４）。
例えば、センサ診断部２３は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、３５０〜４５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９の状態は良好であると判断する。 Next, the sensor diagnosis unit 23 diagnoses the degree of occurrence of drift in the output of each CO 2 sensor 9 from the classification result by the CO 2 concentration classification unit 22 (step S4 in FIG. 3).
For example, when the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 for one month is between 350 and 450 [ppm], the sensor diagnosis unit 23 is in a good state of the CO 2 sensor 9. Judge.

また、センサ診断部２３は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、０〜３５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９のＣＯ2濃度測定値が低めにずれている可能性があると判断する。
また、センサ診断部２３は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、４５０〜６５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９のＣＯ2濃度測定値がやや高めにずれている可能性があると判断する。 The sensor diagnosis unit 23, the minimum value of CO 2 concentration measurements of CO 2 sensor 9 in 1 month, who is between 0 to 350 [ppm], the CO 2 concentration measured value of the CO 2 sensor 9 It is determined that there is a possibility that is shifted slightly.
The sensor diagnosis unit 23, the minimum value of CO 2 concentration measurements of CO 2 sensor 9 in 1 month, who is between 450 to 650 [ppm], the CO 2 concentration measured value of the CO 2 sensor 9 It is judged that there is a possibility that is slightly higher.

さらに、センサ診断部２３は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、６５０［ｐｐｍ］以上の場合、このＣＯ2センサ９のＣＯ2濃度測定値が高めにずれている可能性があると判断する。
こうして、各ＣＯ2センサ９の出力のドリフト発生の程度を診断することができる。 Furthermore, the sensor diagnostic unit 23, the minimum value of CO 2 concentration measurements of CO 2 sensor 9 in one month is the case of 650 [ppm] or more, the deviation in the CO 2 concentration measured value of the CO 2 sensor 9 is increased Judge that there is a possibility.
In this way, it is possible to diagnose the degree of occurrence of drift in the output of each CO 2 sensor 9.

次に、環境評価部２４は、ＣＯ2濃度分類部２２による分類結果から各ＣＯ2センサ９がＣＯ2濃度を測定している制御対象空間１１の室内環境の良好度および空調のエネルギー消費の良好度を診断する（図３ステップＳ５）。
例えば、環境評価部２４は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、３５０〜４５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９が設置されている空調機１の対象となる制御対象空間１１の室内環境および空調のエネルギー消費の状態は良好であると判断する。 Next, the environment evaluation unit 24 determines the degree of good indoor environment of the control target space 11 in which each CO 2 sensor 9 measures the CO 2 concentration from the classification result by the CO 2 concentration classification unit 22 and the energy consumption of the air conditioning. The degree is diagnosed (step S5 in FIG. 3).
For example, when the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 for one month is between 350 and 450 [ppm], the environment evaluation unit 24 is an air conditioner in which the CO 2 sensor 9 is installed. It is determined that the indoor environment of the control target space 11 to be the target of the machine 1 and the energy consumption state of the air conditioning are good.

また、環境評価部２４は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、０〜３５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９が設置されている空調機１の対象となる制御対象空間１１の空調のエネルギー消費は問題ない可能性が高いが、室内環境が悪化している可能性があると判断する。 Moreover, when the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 for one month is between 0 and 350 [ppm], the environment evaluation unit 24 is an air conditioner in which the CO 2 sensor 9 is installed. The energy consumption of the air conditioning in the controlled space 11 that is the target of the machine 1 is likely to be no problem, but it is determined that the indoor environment may be deteriorated.

すなわち、ＣＯ2センサ９のＣＯ2濃度測定値の最小値が０〜３５０［ｐｐｍ］を示しているということは、制御対象空間１１に人がいないときのＣＯ2濃度である４００［ｐｐｍ］近辺の値よりも低い値を示していることになり、必要な外気量を制御対象空間１１に取り込んでいない可能性があるため、制御対象空間１１の室内環境が悪化している恐れがある、ということになる。 That is, the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 indicating 0 to 350 [ppm] means that the vicinity of 400 [ppm] which is the CO 2 concentration when there is no person in the control target space 11. The value is lower than this value, and the necessary outside air amount may not be taken into the control target space 11, so that the indoor environment of the control target space 11 may be deteriorated. It will be.

また、環境評価部２４は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、４５０〜６５０［ｐｐｍ］の間にある場合、このＣＯ2センサ９が設置されている空調機１の対象となる制御対象空間１１の室内環境は問題ない可能性が高いが、空調のエネルギー消費が増加している可能性があると判断する。 Moreover, when the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 for one month is between 450 and 650 [ppm], the environment evaluation unit 24 is an air conditioner in which the CO 2 sensor 9 is installed. The indoor environment of the control target space 11 that is the target of the machine 1 is likely to have no problem, but it is determined that the energy consumption of the air conditioning may increase.

室内環境において望ましいＣＯ2濃度は例えば６００〜８００［ｐｐｍ］で、許容できるＣＯ2濃度は例えば１０００［ｐｐｍ］である。ＣＯ2センサ９のＣＯ2濃度測定値の最小値が４５０〜６５０［ｐｐｍ］を示しているということは、室内環境は問題ない可能性が高いが、制御対象空間１１に人がいないときのＣＯ2濃度である４００［ｐｐｍ］近辺の値よりも高い値を示していることになるので、ＣＯ2濃度を下げるために制御対象空間１１に外気をより多く取り入れている可能性がある。したがって、外気取り込みを抑制する省エネルギー制御が機能していない、ということになり、増エネルギー動作を行っている可能性がある。 A desirable CO 2 concentration in an indoor environment is, for example, 600 to 800 [ppm], and an allowable CO 2 concentration is, for example, 1000 [ppm]. The fact that the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 indicates 450 to 650 [ppm] is highly likely that there is no problem in the indoor environment, but the CO when there is no person in the control target space 11 Since the value is higher than the value in the vicinity of 400 [ppm] which is the 2 concentration, there is a possibility that more outside air is taken into the control target space 11 in order to reduce the CO 2 concentration. Therefore, the energy saving control that suppresses the intake of outside air is not functioning, and there is a possibility that the energy increasing operation is performed.

また、環境評価部２４は、１か月間におけるＣＯ2センサ９のＣＯ2濃度測定値の最小値が、６５０［ｐｐｍ］以上の場合、このＣＯ2センサ９が設置されている空調機１の対象となる制御対象空間１１の室内環境が悪化している可能性があり、また空調のエネルギー消費が大きく増加している可能性があると判断する。ＣＯ2センサ９のＣＯ2濃度測定値の最小値が６５０［ｐｐｍ］以上を示しているということは、ＣＯ2濃度を下げるために制御対象空間１１に制限なく必要以上の外気を取り入れている可能性があり、空調のエネルギー消費がかなり大きくなっている可能性がある。 In addition, when the minimum value of the CO 2 concentration measurement value of the CO 2 sensor 9 for one month is 650 [ppm] or more, the environment evaluation unit 24 targets the air conditioner 1 in which the CO 2 sensor 9 is installed. It is determined that the indoor environment of the control target space 11 may be deteriorated, and the energy consumption of the air conditioning may be greatly increased. The fact that the minimum value of the measured CO 2 concentration of the CO 2 sensor 9 indicates 650 [ppm] or more indicates that it is possible to incorporate more outside air into the control target space 11 without restriction in order to reduce the CO 2 concentration. There is a possibility that the energy consumption of the air conditioning is considerably large.

出力部２５は、センサ診断部２３による診断結果と環境評価部２４による診断結果とを出力する（図３ステップＳ６）。出力の方法としては、画面表示などの方法がある。
図５はセンサ診断部２３による診断結果と環境評価部２４による診断結果の１例を示す図である。図５は、施設内の空調機１４台の還気ダクトに設置された１４個のＣＯ2センサ９の出力の最小値から、それぞれのＣＯ2センサ９のドリフト発生の程度と、室内環境の良好度および空調のエネルギー消費の良好度を診断した結果を示している。ここでは、空調機１毎に設けられた１４個のＣＯ2センサ９を、９−１〜９−１４としている。 The output unit 25 outputs the diagnosis result from the sensor diagnosis unit 23 and the diagnosis result from the environment evaluation unit 24 (step S6 in FIG. 3). As an output method, there is a method such as a screen display.
FIG. 5 is a diagram illustrating an example of a diagnosis result by the sensor diagnosis unit 23 and a diagnosis result by the environment evaluation unit 24. FIG. 5 shows the degree of drift of each CO 2 sensor 9 and the good indoor environment from the minimum value of the outputs of 14 CO 2 sensors 9 installed in the return air ducts of 14 air conditioners in the facility. The result of diagnosing the degree of energy consumption and the degree of energy consumption of air conditioning is shown. Here, the 14 CO 2 sensors 9 provided for each air conditioner 1 are designated as 9-1 to 9-14.

ＣＯ2センサ９−２のＣＯ2濃度測定値の最小値は４０２［ｐｐｍ］、ＣＯ2センサ９−６のＣＯ2濃度測定値の最小値は４０７［ｐｐｍ］、ＣＯ2センサ９−７のＣＯ2濃度測定値の最小値は３５７［ｐｐｍ］、ＣＯ2センサ９−８のＣＯ2濃度測定値の最小値は３８７［ｐｐｍ］、ＣＯ2センサ９−９のＣＯ2濃度測定値の最小値は４２４［ｐｐｍ］、ＣＯ2センサ９−１１のＣＯ2濃度測定値の最小値は４０６［ｐｐｍ］である。これらの値は３５０〜４５０［ｐｐｍ］の範囲に含まれるので、ＣＯ2センサ９−２，９−６，９−７，９−８，９−９，９−１１の状態は良好であり、ＣＯ2センサ９−２，９−６，９−７，９−８，９−９，９−１１が設置されている各空調機１の対象となる制御対象空間の室内環境および空調のエネルギー消費の状態は良好であると判断される。 The minimum value of the measured CO 2 concentration of the CO 2 sensor 9-2 is 402 [ppm], the minimum value of the measured CO 2 concentration of the CO 2 sensor 9-6 is 407 [ppm], and the CO of the CO 2 sensor 9-7 minimum of 2 concentration measurements 357 [ppm], the minimum value of CO 2 concentration measurements of CO 2 sensor 9-8 387 [ppm], the minimum value of CO 2 concentration measurements of CO 2 sensors 9-9 The minimum value of the CO 2 concentration measurement value of 424 [ppm] and the CO 2 sensor 9-11 is 406 [ppm]. Since these values are included in the range of 350 to 450 [ppm], the state of the CO 2 sensors 9-2, 9-6, 9-7, 9-8, 9-9, 9-11 is good, CO 2 sensors 9-2, 9-6, 9-7, 9-8, 9-9, 9-11, the indoor environment of the control target space targeted for each air conditioner 1 and the energy consumption of the air conditioning It is judged that the state of is good.

また、ＣＯ2センサ９−３のＣＯ2濃度測定値の最小値は５０［ｐｐｍ］、ＣＯ2センサ９−５のＣＯ2濃度測定値の最小値は３１８［ｐｐｍ］である。これらの値は０〜３５０［ｐｐｍ］の範囲に含まれるので、ＣＯ2センサ９−３，９−５のＣＯ2濃度測定値が低めにずれている可能性があり、ＣＯ2センサ９−３，９−５が設置されている各空調機１の対象となる制御対象空間の空調のエネルギー消費は問題ないが、室内環境が悪化している可能性があると判断される。 The minimum value of the measured CO 2 concentration of the CO 2 sensor 9-3 is 50 [ppm], and the minimum value of the measured CO 2 concentration of the CO 2 sensor 9-5 is 318 [ppm]. These values are within the range of 0 to 350 [ppm], there is a possibility that the CO 2 concentration measurements of CO 2 sensor 9-3,9-5 is shifted to a lower, CO 2 sensor 9-3 , 9-5 installed, there is no problem with the energy consumption of the air conditioning in the control target space that is the target of each air conditioner 1, but it is determined that the indoor environment may be deteriorated.

また、ＣＯ2センサ９−４のＣＯ2濃度測定値の最小値は５２５［ｐｐｍ］、ＣＯ2センサ９−１２のＣＯ2濃度測定値の最小値は５０１［ｐｐｍ］、ＣＯ2センサ９−１３のＣＯ2濃度測定値の最小値は５８６［ｐｐｍ］、ＣＯ2センサ９−１４のＣＯ2濃度測定値の最小値は５５１［ｐｐｍ］である。これらの値は４５０〜６５０［ｐｐｍ］の範囲に含まれるので、ＣＯ2センサ９−４，９−１２，９−１３，９−１４のＣＯ2濃度測定値がやや高めにずれている可能性があり、ＣＯ2センサ９−４，９−１２，９−１３，９−１４が設置されている各空調機１の対象となる制御対象空間の室内環境は問題ないが、空調のエネルギー消費が増加している可能性があると判断され、「増エネルギー注意」に分類される。 The minimum value of the measured CO 2 concentration of the CO 2 sensor 9-4 is 525 [ppm], the minimum value of the measured CO 2 concentration of the CO 2 sensor 9-12 is 501 [ppm], and the CO 2 sensor 9-13. The minimum value of the measured CO 2 concentration is 586 [ppm], and the minimum value of the measured CO 2 concentration of the CO 2 sensor 9-14 is 551 [ppm]. Since these values are included in the range of 450 to 650 [ppm], the CO 2 concentration measurement values of the CO 2 sensors 9-4, 9-12, 9-13, and 9-14 may be slightly higher. There is no problem in the indoor environment of the control target space that is the target of each air conditioner 1 in which the CO 2 sensors 9-4, 9-12, 9-13, and 9-14 are installed. It is judged that there is a possibility that it has increased, and is classified as “attention to increase energy”.

また、ＣＯ2センサ９−１のＣＯ2濃度測定値の最小値は７２６［ｐｐｍ］、ＣＯ2センサ９−１０のＣＯ2濃度測定値の最小値は６７１［ｐｐｍ］である。これらの値は６５０［ｐｐｍ］以上となるので、ＣＯ2センサ９−１，９−１０のＣＯ2濃度測定値が高めにずれている可能性があり、ＣＯ2センサ９−１，９−１０が設置されている各空調機１の対象となる制御対象空間の室内環境が悪化している可能性があり、また空調のエネルギー消費が大きく増加している可能性があると判断され、「増エネルギー確実」に分類される。 The minimum value of the CO 2 concentration measurements of CO 2 sensor 9-1 726 [ppm], the minimum value of CO 2 concentration measurements of CO 2 sensor 9-10 is 671 [ppm]. These values become 650 [ppm] or more, there is a possibility that the CO 2 concentration measurements of CO 2 sensor 9-1,9-10 is deviated to be higher, CO 2 sensor 9-1,9-10 It is determined that there is a possibility that the indoor environment of the control target space that is the target of each air conditioner 1 in which the air conditioner 1 is installed has deteriorated, and that the energy consumption of the air conditioning may have increased significantly. Classified as “Energy certainty”.

以上のように、本実施の形態では、それぞれのＣＯ2センサの所定期間における出力の最小値に基づいて、どのＣＯ2センサにどの程度の量のドリフトが発生している可能性があるかを把握することが可能となる。
また、施設の管理者は、このような診断結果から、ＣＯ2センサの点検あるいは交換が必要であることを認識することが可能となるので、ＣＯ2センサの動作不良による省エネルギー効果の損失や、室内環境の悪化に対して早急に対応することが可能である。 As described above, in the present embodiment, what amount of drift may occur in which CO 2 sensor based on the minimum value of the output of each CO 2 sensor in a predetermined period. It becomes possible to grasp.
Moreover, since the manager of the facility can recognize from the diagnosis result that the inspection or replacement of the CO 2 sensor is necessary, the loss of the energy saving effect due to the malfunction of the CO 2 sensor, It is possible to respond immediately to the deterioration of the indoor environment.

本実施の形態のＣＯ2センサ診断装置２０は、ＣＰＵ（Central Processing Unit）、記憶装置及びインタフェースを備えたコンピュータと、これらのハードウェア資源を制御するプログラムによって実現することができる。ＣＰＵは、記憶装置に格納されたプログラムに従って本実施の形態で説明した処理を実行する。 The CO 2 sensor diagnostic apparatus 20 according to the present embodiment can be realized by a computer having a CPU (Central Processing Unit), a storage device, and an interface, and a program for controlling these hardware resources. The CPU executes the processing described in the present embodiment in accordance with a program stored in the storage device.

本発明は、ＣＯ2センサの状態を診断する技術に適用することができる。 The present invention can be applied to a technique for diagnosing the state of a CO 2 sensor.

１…空調機、２…外気ダンパ、３…還気ダンパ、４…冷水バルブ、５…温水バルブ、６…加湿バルブ、７…給気温度センサ、８−１〜８−ｎ…室内温度センサ、９…ＣＯ2センサ、１０−１〜１０−ｎ…湿度センサ、１１−１〜１１−ｎ…制御対象空間、１２…コントローラ、１３−１〜１３−ｎ…ＶＡＶユニット、１４…フィルター、１５…冷水コイル、１６…温水コイル、１７…加湿器、１８…ファン、２０…ＣＯ2センサ診断装置、２１…ＣＯ2濃度測定値取得部、２２…ＣＯ2濃度分類部、２３…センサ診断部、２４…環境評価部、２５…出力部。 DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Outside air damper, 3 ... Return air damper, 4 ... Cold water valve, 5 ... Hot water valve, 6 ... Humidification valve, 7 ... Supply air temperature sensor, 8-1 to 8-n ... Indoor temperature sensor, 9 ... CO 2 sensor, 10-1 to 10-n ... humidity sensor, 11-1 to 11-n ... control target space, 12 ... controller, 13-1 to 13-n ... VAV unit, 14 ... filter, 15 ... cold water coil, 16 ... hot water coil, 17 ... humidifier, 18 ... fan, 20 ... CO 2 sensor diagnostic apparatus, 21 ... CO 2 concentration measurement value acquiring unit, 22 ... CO 2 concentration classifying unit, 23 ... sensor diagnostic unit, 24 ... environmental evaluation part, 25 ... output part.

Claims (4)

施設に設けられた複数のＣＯ2センサからＣＯ2濃度測定値を取得して、所定期間におけるＣＯ2濃度測定値の最小値をセンサ毎に求めるＣＯ2濃度測定値取得手段と、
このＣＯ2濃度測定値取得手段が求めた各ＣＯ2センサのＣＯ2濃度測定値の最小値を、予め定められたＣＯ2濃度値を基準にした複数のＣＯ2濃度範囲に分類するＣＯ2濃度分類手段と、
このＣＯ2濃度分類手段による分類結果から各ＣＯ2センサの出力のドリフト発生の程度を診断するセンサ診断手段とを備えることを特徴とするＣＯ2センサ診断装置。 A plurality of CO 2 sensor provided in the facility to obtain a CO 2 concentration measurements, and the CO 2 concentration measured value acquisition means for obtaining the minimum value of CO 2 concentration measurements for each sensor during a predetermined period,
CO 2 concentration of classifying the minimum value of CO 2 concentration measurement for each CO 2 sensor The CO 2 concentration measurement value acquisition means is determined, a plurality of CO 2 concentration range relative to the predetermined CO 2 concentration value Classification means;
A CO 2 sensor diagnostic apparatus comprising: a sensor diagnostic unit that diagnoses the degree of drift generation of the output of each CO 2 sensor from the classification result by the CO 2 concentration classification unit. 請求項１記載のＣＯ2センサ診断装置において、
前記予め定められたＣＯ2濃度値は、外気のＣＯ2濃度値であることを特徴とするＣＯ2センサ診断装置。 The CO 2 sensor diagnostic device according to claim 1, wherein
It said predetermined CO 2 concentration value, CO 2 sensor diagnostic apparatus which is a external air CO 2 concentration value. 施設に設けられた複数のＣＯ2センサからＣＯ2濃度測定値を取得して、所定期間におけるＣＯ2濃度測定値の最小値をセンサ毎に求めるＣＯ2濃度測定値取得ステップと、
このＣＯ2濃度測定値取得ステップで求めた各ＣＯ2センサのＣＯ2濃度測定値の最小値を、予め定められたＣＯ2濃度値を基準にした複数のＣＯ2濃度範囲に分類するＣＯ2濃度分類ステップと、
このＣＯ2濃度分類ステップによる分類結果から各ＣＯ2センサの出力のドリフト発生の程度を診断するセンサ診断ステップとを含むことを特徴とするＣＯ2センサ診断方法。 A plurality of CO 2 sensor provided in the facility to obtain a CO 2 concentration measurements, and the CO 2 concentration measured value acquisition step of obtaining the minimum value of CO 2 concentration measurements for each sensor during a predetermined period,
CO 2 concentration of classifying the minimum value of CO 2 concentration measurement for each CO 2 sensor calculated in the CO 2 concentration measurement value acquisition step, a plurality of CO 2 concentration range relative to the predetermined CO 2 concentration value A classification step;
CO 2 sensor diagnostic method which comprises a sensor diagnostic step of diagnosing the degree of drift occurrence of the output of the CO 2 sensor from the classification result by the CO 2 concentration classification step. 請求項３記載のＣＯ2センサ診断方法において、
前記予め定められたＣＯ2濃度値は、外気のＣＯ2濃度値であることを特徴とするＣＯ2センサ診断方法。 In the CO 2 sensor diagnostic method according to claim 3,
It said predetermined CO 2 concentration value, CO 2 sensor diagnostic method which is a external air CO 2 concentration value.
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