CN103868197B - CO2The automatic regulating apparatus of sensor and method - Google Patents
CO2The automatic regulating apparatus of sensor and method Download PDFInfo
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- CN103868197B CN103868197B CN201310661655.9A CN201310661655A CN103868197B CN 103868197 B CN103868197 B CN 103868197B CN 201310661655 A CN201310661655 A CN 201310661655A CN 103868197 B CN103868197 B CN 103868197B
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- Prior art keywords
- concentration measurement
- sensor
- air dampers
- closing
- parameter
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/70—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/40—Damper positions, e.g. open or closed
Abstract
The CO of the present invention2The automatic regulating apparatus of sensor and method prevent error to be superimposed on revised CO2Concentration measurement.Automatic regulating apparatus includes: from the CO to control object space2The CO that concentration is measured2Sensor obtains CO2The CO of concentration measurement2Concentration measurement obtaining section (120)；To CO2The opening and closing instruction parameter of air dampers when sensor adjusts automatically carries out the parameter storage part (122) stored；Airdoor control portion (121), it indicates the condition that parameter specifies that the aperture of air dampers is controlled according to by opening and closing, directs the air in control object space, at CO when should performing automatically to adjust2Concentration measurement continuous certain time in the scope of reference value ± α when close air dampers；And by from the CO during closing to air dampers when automatically adjusting and start2Baseline, as baseline, is replaced into the CO of reference value by the minima of concentration measurement2Sensor drift correction portion (124).
Description
Technical field
The present invention relates to a kind of to CO2Automatic regulating apparatus that the drift of sensor is modified and method.
Background technology
People, when carrying out daily life, is producing CO round the clock2.Such as, CO is produced due to breathing2.Therefore, not as CO in building2Produce source people state under, by atmospheric concentration and 400ppm being set as minima with the ventilation of exogenous QI.To CO2The CO of solid electrolytic type etc. that is measured of concentration2Sensor can produce the drift of maximum 150ppm/ (timeliness change) thus causing that deviation produces due to the optical considerations of detecting element.In the past, each year all manually carried out CO2The correction of 0ppm gas, implements CO2The replacement of the drift value of sensor.
CO2The correction of 0ppm gas has can carry out the advantage that correction adjusts reliably, but has complexity and the cost such problem of cost.Therefore, just popularizing will by CO2CO in the certain time (period) that sensor is sampled2The minima of concentration is modified to the automatic regulating function (AutomaticBaselineCorrection) (with reference to patent documentation 1, non-patent literature 1, non-patent literature 2) of atmospheric concentration (400ppm).
Prior art literature
Patent documentation
[patent documentation 1] Japanese Unexamined Patent Publication 11-14583 publication
[non-patent literature]
[non-patent literature 1] " conduit inserts shape CO2(ダ Network ト enters shape CO to sensor CDE2セ Application サ CDE) ", [online], ス リ ケ Co., Ltd., [December in 2012 retrieval on the 4th], the Internet<http://www.three-k.biz/pdf/CDE-J.pdf#search>
[non-patent literature 2] " large-scale CO2Display MODEL4018 (big shape CO2Announcer MODEL4018) ", [online], He He Electric Co., Ltd, [December in 2012 retrieval on the 4th], the Internet<http://www.tsuruga.co.jp/products/4018/index.html>
Summary of the invention
The problem that invention to solve
Adopt existing method, under the air-tightness height or 24 hours resident environment of people of building, be all CO all the time2Continue the situation occurred, the CO in building2Concentration sometimes will not be reduced near atmospheric concentration.Under such circumstances by automatic regulating function to CO2The minima of concentration is modified, and has and error is superimposed on CO2The probability of the measured value of concentration.Such as, only it is reduced under the environment of 600ppm at least concentration, is adjusted to 400ppm by automatic regulating function 600ppm, the CO after therefore adjusting2The measured value of concentration produces the error of-200ppm.
The present invention, precisely in order to solve above-mentioned problem and make, its object is to provide one to be prevented from error and is superimposed on revised CO2The CO of concentration measurement2The automatic regulating apparatus of sensor and method.
For solving the means of problem
The CO of the present invention2The automatic regulating apparatus of sensor, it is characterised in that including: CO2Concentration measurement acquisition unit, it is from the CO to control object space2The CO that concentration is measured2Sensor obtains CO2Concentration measurement；Parameter storage unit, it prestores described CO2The opening and closing instruction parameter of air dampers when sensor adjusts automatically；Airdoor control unit, it is when should performing described automatic adjustment according to prespecified adjustment arrangement, indicate the condition that parameter specifies that the aperture of described air dampers is controlled according to by described opening and closing, and direct the air in described control object space, at described CO2When concentration measurement continuous certain time is in the scope of reference value ± α (α is setting), close described air dampers；And CO2Sensor drift amending unit, its by when starting from described automatic adjustment to described air dampers close during CO2The minima of concentration measurement, as baseline, carries out being replaced into this baseline the drift correction of described reference value.
Again, the CO of the present invention2One configuration example of the automatic regulating apparatus of sensor is, also including parameter setting unit, described parameter setting unit is about to the CO before starting based on the opening time of described air dampers closing to described air dampers when starting from described automatic adjustment, described automatic adjustment2Concentration measurement and from described automatic adjustment start time to described air dampers close during CO2Concentration measurement, indicates parameter to be updated described opening and closing, to meet CO2Concentration measurement decreases up to this CO2Concentration measurement continuous certain time in the scope of reference value ± α till such condition.
Again, the CO of the present invention2The automatic adjusting method of sensor, it is characterised in that comprise the following steps: CO2Concentration measurement acquisition step, it is from the CO to control object space2The CO that concentration is measured2Sensor obtains CO2Concentration measurement；Airdoor control step, it is when should performing described automatic adjustment according to prespecified adjustment arrangement, the aperture of air dampers is controlled by the condition according to being specified by the opening and closing instruction parameter being stored in advance in parameter storage unit, and direct the air in described control object space, at described CO2When concentration measurement continuous certain time is in the scope of reference value ± α, closing described air dampers, wherein α is setting；And CO2Sensor drift correction step, its by when starting from described automatic adjustment to described air dampers close during CO2The minima of concentration measurement, as baseline, carries out being replaced into this baseline the drift correction of described reference value.
Invention effect
According to the present invention, CO should carried out2When automatically adjusting of sensor, indicates the condition that parameter specifies to control the aperture of air dampers according to by opening and closing, directs the air in control object space so that CO2Concentration measurement continuous certain time, in the scope of reference value ± α, is therefore possible to prevent error to be superimposed on revised CO2Concentration measurement, it is possible to improve the reliability automatically adjusted.
Again, in the present invention, by being about to the CO before starting based on the opening time of the air dampers closing to air dampers during from the beginning automatically adjusted, automatically adjustment2Concentration measurement and from closing to air dampers when automatically adjusting and start during CO2Opening and closing is indicated parameter to be updated by concentration measurement, it is possible to carry out the study of opening and closing instruction parameter, so that CO2Concentration measurement decrease up to its continuous certain time in the scope of reference value ± α till.
Accompanying drawing explanation
Fig. 1 is the block diagram of the composition of the air-conditioner control system involved by embodiment illustrating the present invention.
Fig. 2 is the block diagram of the composition of the controller involved by embodiment illustrating the present invention.
Fig. 3 is shown in the embodiment of the present invention to CO2The flow chart of the action of automatic regulating apparatus when automatically adjusting that the drift of sensor is modified.
Fig. 4 is the figure of the record example of the data being shown in the embodiment of the present invention to be recorded in parameter setting portion.
Detailed description of the invention
[principle of invention]
In the present invention, by with the prespecified cycle by air dampers standard-sized sheet certain time, suck the air of certain time, on this basis will by CO2The CO that sensor measures2The minima of concentration is modified to atmospheric concentration (400ppm).Again, in the present invention, the opening time of air dampers is learnt so that CO2Concentration measurement is reduced to atmospheric concentration.
[embodiment]
Hereinafter, with reference to accompanying drawing, the embodiment of the present invention is illustrated.Fig. 1 is the block diagram of the composition of the air-conditioner control system involved by embodiment illustrating the present invention.Air-conditioner control system includes: air conditioner 1；To the air OA air dampers 2 being controlled to the import volume of air conditioner 1；To the return-air RA returned from the control object space 11 return-air air door 3 being controlled to the import volume of air conditioner 1；The cold valves 4 that the amount of the cold water of the chilled water coil being delivered to air conditioner 1 is controlled；The hot water valve 5 that the amount of the hot water of the hot-water coil pipe being delivered to air conditioner 1 is controlled；The humidifier valve 6 that the cold water of humidifier or the amount of hot water that are delivered to air conditioner 1 are controlled；The feed air temperature sensor 7 that the temperature of the air (supply SA) transferred out from air conditioner 1 is measured；The indoor temperature transmitter 8 that the temperature in control object space 11 is measured；CO to control object space 112Concentration carries out the CO measured2Sensor 9；The humidity sensor 10 that the humidity in control object space 11 is measured；The controller 12 that air door 2,3 and valve 3,4,5 are controlled；And VAV (VariableAirVolume (variable air rate)) unit 13.Air conditioner 1 includes: filter 14, cooling air chilled water coil 15, add the fan 18 of the cooled or warmed-up air of the hot-water coil pipe 16 of hot-air, humidifier 17 and conveying.
It follows that simply the action of the air-conditioner control system of Fig. 1 is illustrated.The chilled water coil 15 of air conditioner 1 is utilized and from the cold water of not shown heat exchanger supply, air OA and return-air RA is cooled down by cold valves 4.The hot-water coil pipe 16 of air conditioner 1 utilizes the hot water supplied from heat exchanger by hot water valve 5 that air OA and return-air RA is heated.Again, the cold water sent from heat exchanger or hot water are supplied to humidifier 17 by humidifier valve 6.Humidifier 17, by producing water spray state, is controlled by the humidity of coil pipe 15,16 cooling or warmed-up supply SA.Cooled down by coil pipe 15,16 or heat and added wet supply SA by humidifier 17 and be sent to control object space 11 by fan 18.The portion of air in control object space 11 is back to air conditioner 1 as return-air RA.
The temperature of the feed air temperature sensor 7 supply SA to sending from air conditioner 1 is measured.The temperature in control object space 11 is measured by indoor temperature transmitter 8, CO2The sensor 9 CO to control object space 112Concentration measures, and the humidity in control object space 11 is measured by humidity sensor 10.The aperture of valve 4,5 is controlled by controller 12, so that the temperature of supply SA is consistent with the feed air temperature setting value of regulation.Again, the aperture of air dampers 2 is controlled by controller 12, so that the CO in control object space 112The CO of concentration and regulation2Concentration set point is consistent.Further, the aperture of humidifier valve 6 is controlled by controller 12, so that the humidity in control object space 11 is consistent with the humidity set point of regulation.
VAV unit 13 is so that the temperature in control object space 11 and the indoor temperature setting value of regulation are consistent and the requirement air quantity in control object space 11 is carried out computing, require air quantity in order to ensure this, the aperture of the air door (not shown) in VAV unit 13 is controlled.The general requirements airflow value of system entirety is carried out computing according to sending the requirement airflow value come from multiple VAV unit 13 by controller 12, obtains fan rotation number corresponding with this general requirements airflow value, is controlled air conditioner 1 reaching this fan rotation number obtained.
Relate in the building administrative law of above such air-conditioner control system, it is stipulated that 6 CO of annual mensuration2Concentration, and by CO2Concentration is set in below 1000ppm.Hereinafter, to revising CO2The automatic regulating apparatus of the drift of sensor 9 illustrates.
Fig. 2 is the block diagram of the composition illustrating controller 12.Controller 12 includes: from CO2Sensor 9 obtains CO2The CO of concentration measurement2Concentration measurement obtaining section 120；The airdoor control portion 121 that air door 2,3 is controlled；Prestore CO2The parameter storage part 122 of the opening and closing instruction parameter of the air dampers 2 when sensor 9 adjusts automatically；Opening and closing is indicated the parameter setting portion 123 that parameter is updated；Carry out CO2The CO of the drift correction of sensor 92Sensor drift correction portion 124；The measured value obtaining section 125 of measured value is obtained from feed air temperature sensor 7 and humidity sensor 10；And the valve control portion 126 that valve 4,5,6 is controlled.CO2Concentration measurement obtaining section 120, airdoor control portion 121, parameter storage part 122, parameter setting portion 123 and CO2Sensor drift correction portion 124 constitutes automatic regulating apparatus.
Airdoor control portion 121 carry out usual time the control of air dampers 2 and valve control portion 126 carry out usual time the control of valve 4,5,6 as it has been described above, detailed description will be omitted.
Fig. 3 illustrates correction CO2The flow chart of the action of automatic regulating apparatus when automatically adjusting of the drift of sensor 9.
Airdoor control portion 121 is when performing automatically to adjust according to prespecified adjustment arrangement (such as 1 year 1 time, performed such arrangement January 1) (being yes in Fig. 3 step S1), indicate parameter (opening time of air dampers 2, aperture etc.) that the aperture of air dampers 2 is controlled according to the opening and closing of the air dampers 2 being stored in parameter storage part 122, start automatically to adjust (Fig. 3 step S2).When automatically adjusting, the aperture of air dampers 2 is generally set to 100% (standard-sized sheet).So, extraneous gas is imported into control object space 11 by air conditioner 1 from air dampers 2, the CO in control object space 112Concentration reduces.
When automatically adjusting beginning, parameter setting portion 123 records opening time and the CO that air dampers 2 is opened2The CO that concentration measurement obtaining section 120 obtains2Concentration measurement (Fig. 3 step S3).
Airdoor control portion 121 is at CO2When concentration measurement continuous certain time is in the scope of atmospheric concentration (400ppm) ± α (α is the feasible value specified) (being yes in Fig. 3 step S4), close air dampers 2 (Fig. 3 step S5).It addition, at the opening time that have passed through the air dampers 2 being indicated parameter to specify by opening and closing, CO2Concentration measurement also without continuous certain time in the scope of atmospheric concentration (400ppm) ± α, extend the opening time of air dampers 2 until CO2Concentration measurement continuous certain time is in the scope of atmospheric concentration (400ppm) ± α.
Air dampers 2 one is closed, CO2Sensor drift correction portion 124 is just by from the CO during closing to air dampers 2 when automatically adjusting and start2The minima of concentration measurement, as baseline, carries out being replaced into this baseline the drift correction (Fig. 3 step S6) of the atmospheric concentration value (400ppm) as reference value.After, pass through CO2The CO of sensor 9 sampling2Concentration measurement is for premised on 400ppm by the baseline being prescribed when this drift correction.
Finally, parameter setting portion 123 based on from the opening time of the air dampers 2 closing to air dampers 2 when automatically adjusting and start, automatically adjust the CO being about to before starting2Concentration measurement and from closing to air dampers 2 when automatically adjusting and start during CO2The minima of concentration measurement, indicates parameter to be updated (Fig. 3 step S7) opening and closing of parameter storage part 122 as required.
Fig. 4 is the figure of the record example illustrating the data being recorded in parameter setting portion 123.In the example in fig. 4, record has the opening time of the air dampers 2 closing to air dampers 2 during the beginning from adjustment automatically, automatically adjusts the CO being about to before beginning2Concentration measurement, from closing to air dampers 2 when automatically adjusting and start during CO2The minima of concentration measurement and CO before2Concentration measurement and CO2The difference of the minima of concentration measurement.
Such as on October 25th, 2011, on October 7th, 2012 example in, open air dampers 2 two hours, CO2Concentration measurement is reduced to the scope of 400ppm ± α (such as 10ppm).Therefore, if the opening time of the air dampers 2 specified by opening and closing instruction parameter is two hours, then opening and closing instruction parameter need not be updated.On the other hand, in the example on April 20th, 2012, it is known that by CO2Concentration measurement is reduced to the scope of 400ppm ± α to spend 2 hours 20 minutes.It can thus be appreciated that when the opening time of the air dampers 2 specified by opening and closing instruction parameter is 2 hours, this opening time is inadequate.Therefore, parameter setting portion 123 indicates the opening time of air dampers 2 that specifies of parameter, aperture to be updated to by opening and closing.In this example embodiment, as long as opening time being set to 2 hours 20 minutes.
So, the opening and closing of parameter storage part 122 is indicated parameter to be updated by parameter setting portion 123, to meet CO2Concentration measurement reduces until its continuous certain time such condition in the scope of atmospheric concentration (400ppm) ± α.In upper adjustment automatically once, then use this opening and closing being updated instruction parameter.It addition, the record example of Fig. 4 is an example, it is also possible to record the meansigma methods etc. at occupancy.
As it has been described above, in this embodiment, CO should be being performed2When automatically adjusting of sensor 9, indicates the condition that parameter specifies that the aperture of air dampers 2 is controlled according to by opening and closing, actively directs the air in control object space 11 so that CO2Concentration measurement continuous certain time, in the scope of atmospheric concentration ± α, is therefore possible to prevent error to be superimposed on revised CO2Concentration measurement, it is possible to improve the reliability automatically adjusted.Again, in this embodiment, it is possible to carry out the study of opening and closing instruction parameter, so that CO2Concentration measurement reduces until its continuous certain time is in the scope of atmospheric concentration ± α.
The controller 12 of this embodiment can pass through have CPU (CentralProcessingUnit (CPU)), storage device and computer and the program that these hardware resources are controlled with outside interface and realize.In such computer, the program for realizing the automatic adjusting method of the present invention is provided in the state recorded on medium of floppy disk, CD-ROM, DVD-ROM, storage card etc. with record.The program write storage device that CPU will read from record medium, according to the program being stored in this storage device to perform the process of this embodiment.
Industrial applicability
Present invention may apply to CO2The technology that the drift of sensor is modified.
Symbol description
1 ... air conditioner, 2 ... air dampers, 3 ... return-air air door, 4 ... cold valves, 5 ... hot water valve, 6 ... humidifier valve, 7 ... feed air temperature sensor, 8 ... indoor temperature transmitter, 9 ... CO2Sensor, 10 ... humidity sensor, 11 ... control object space, 12 ... controller, 13 ... VAV unit, 14 ... filter, 15 ... chilled water coil, 16 ... hot-water coil pipe, 17 ... humidifier, 18 ... fan, 120 ... CO2Concentration measurement obtaining section, 121 ... airdoor control portion, 122 ... parameter storage part, 123 ... parameter setting portion, 124 ... CO2Sensor drift correction portion, 125 ... measured value obtaining section, 126 ... valve control portion.
Claims (4)
1. a CO2The automatic regulating apparatus of sensor, it is characterised in that including:
CO2Concentration measurement acquisition unit, it is from the CO to control object space2The CO that concentration is measured2Sensor obtains CO2Concentration measurement；
Parameter storage unit, it prestores described CO2The opening and closing instruction parameter of air dampers when sensor adjusts automatically；
Airdoor control unit, it is when should performing described automatic adjustment according to prespecified adjustment arrangement, indicate the condition that parameter specifies that the aperture of described air dampers is controlled according to by described opening and closing, and direct the air in described control object space, at described CO2When concentration measurement continuous certain time is in the scope of reference value ± α, closing described air dampers, wherein α is setting；And
CO2Sensor drift amending unit, its by when starting from described automatic adjustment to described air dampers close during CO2The minima of concentration measurement, as baseline, carries out being replaced into this baseline the drift correction of described reference value.
2. CO as claimed in claim 12The automatic regulating apparatus of sensor, it is characterised in that also include parameter setting unit,
Described parameter setting unit is about to the CO before starting based on the opening time of described air dampers closing to described air dampers when starting from described automatic adjustment, described automatic adjustment2Concentration measurement and from described automatic adjustment start time to described air dampers close during CO2Concentration measurement, indicates parameter to be updated described opening and closing, to meet CO2Concentration measurement decreases up to this CO2Concentration measurement continuous certain time in the scope of reference value ± α till such condition.
3. a CO2The automatic adjusting method of sensor, it is characterised in that comprise the following steps:
CO2Concentration measurement acquisition step, it is from the CO to control object space2The CO that concentration is measured2Sensor obtains CO2Concentration measurement；
Airdoor control step, it is when should performing described automatic adjustment according to prespecified adjustment arrangement, the aperture of air dampers is controlled by the condition according to being specified by the opening and closing instruction parameter being stored in advance in parameter storage unit, and direct the air in described control object space, at described CO2When concentration measurement continuous certain time is in the scope of reference value ± α, closing described air dampers, wherein α is setting；And
CO2Sensor drift correction step, its by when starting from described automatic adjustment to described air dampers close during CO2The minima of concentration measurement, as baseline, carries out being replaced into this baseline the drift correction of described reference value.
4. CO as claimed in claim 32The automatic adjusting method of sensor, it is characterised in that also include Parameter setting step,
In described Parameter setting step, it is about to the CO before starting based on the opening time of described air dampers closing to described air dampers when starting from described automatic adjustment, described automatic adjustment2Concentration measurement and from described automatic adjustment start time to described air dampers close during CO2Concentration measurement, indicates parameter to be updated described opening and closing, to meet CO2Concentration measurement decreases up to this CO2Concentration measurement continuous certain time in the scope of reference value ± α till such condition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-269028 | 2012-12-10 | ||
| JP2012269028A JP5969909B2 (en) | 2012-12-10 | 2012-12-10 | CO2 sensor automatic adjustment device and method |
Publications (2)
| Publication Number | Publication Date |
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| CN103868197A CN103868197A (en) | 2014-06-18 |
| CN103868197B true CN103868197B (en) | 2016-07-20 |
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| CN201310661655.9A Expired - Fee Related CN103868197B (en) | 2012-12-10 | 2013-12-09 | CO2The automatic regulating apparatus of sensor and method |
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| Country | Link |
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| JP (1) | JP5969909B2 (en) |
| KR (1) | KR101566592B1 (en) |
| CN (1) | CN103868197B (en) |
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| CN108680516B (en) * | 2018-05-18 | 2021-03-26 | 中国科学院合肥物质科学研究院 | Spectrum baseline correction method and system |
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| CN110243999B (en) * | 2019-05-16 | 2022-08-19 | 青岛海尔（胶州）空调器有限公司 | Calibration method of carbon dioxide sensor for fresh air system of air conditioner |
| CN110261538B (en) * | 2019-05-16 | 2022-08-19 | 青岛海尔空调器有限总公司 | Air conditioner fresh air system and calibration method of carbon dioxide sensor thereof |
| CN110146650B (en) * | 2019-05-16 | 2022-08-19 | 青岛海尔空调器有限总公司 | Calibration method of carbon dioxide sensor for air conditioner fresh air system |
| CN110133192B (en) * | 2019-05-16 | 2022-08-19 | 青岛海尔空调器有限总公司 | Calibration method of carbon dioxide sensor for fresh air system of air conditioner |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5969909B2 (en) | 2016-08-17 |
| CN103868197A (en) | 2014-06-18 |
| KR101566592B1 (en) | 2015-11-05 |
| JP2014115175A (en) | 2014-06-26 |
| KR20140075599A (en) | 2014-06-19 |
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