CN111780335B - Fresh air system control method and device and air conditioner - Google Patents
Fresh air system control method and device and air conditioner Download PDFInfo
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- CN111780335B CN111780335B CN202010483896.9A CN202010483896A CN111780335B CN 111780335 B CN111780335 B CN 111780335B CN 202010483896 A CN202010483896 A CN 202010483896A CN 111780335 B CN111780335 B CN 111780335B
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
- 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
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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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
- F24F2110/10—Temperature
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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
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention provides a fresh air system control method, a fresh air system control device and an air conditioner, wherein the fresh air system control method comprises the following steps: acquiring the concentration of indoor carbon dioxide; controlling to start a fresh air unit according to the concentration of indoor carbon dioxide, and introducing fresh air into a room; after the fresh air unit is started, the fresh air unit is controlled to be closed according to the indoor carbon dioxide concentration and the carbon dioxide concentration variation trend; the carbon dioxide concentration variation trend is obtained by detecting the first derivative f (x) of the carbon dioxide concentration. Through the indoor carbon dioxide concentration of setting real-time detection of carbon dioxide concentration sensor and new trend unit, the first derivative of accurate calculation carbon dioxide concentration can be real-time accurate, reliable feedback indoor carbon dioxide's concentration change, realize that accurate regulation and control new trend unit introduces outdoor new trend indoor, control opening and closing of new trend unit, avoid appearing the erroneous judgement because of the signal is unusual, effectively guarantee data accuracy and stability, promote the indoor air quality.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fresh air system control method and device and an air conditioner.
Background
With the increasing comfort of people for air conditioners, not only the temperature and the humidity are concerned, but also the air quality in a room, such as PM2.5, air turbidity, carbon dioxide concentration and the like, are concerned, the carbon dioxide density is higher than that of air, and when the carbon dioxide is low, the carbon dioxide is harmless to human bodies, but when the carbon dioxide is higher than a certain amount, the carbon dioxide can affect the breathing of people (other living things are also) because the carbonic acid concentration in blood is increased, the acidity is enhanced, and acidosis is generated. When the volume fraction of carbon dioxide in the air is 1%, the patients feel stuffiness, dizziness and palpitation; vertigo is felt when 4% -5%; above 6%, it will cause people to be unconscious and stop breathing gradually, resulting in death. Therefore, the comfort of the air conditioner can list important indexes for air freshness, and when people use the air conditioner, the air circulation is less due to the fact that doors and windows are closed, and meanwhile, the human body continuously breathes to generate carbon dioxide, so that the problems that the concentration of the carbon dioxide in the air of a room is increased, the air of the room is not fresh, the air of the room is turbid and the like are caused.
In order to reduce the discomfort caused by overhigh carbon dioxide concentration in a room to a human body, window ventilation is generally adopted or fresh air is introduced through a fresh air system to replace outdoor fresh air into the room in the prior art so as to reduce the concentration of the indoor carbon dioxide. However, when fresh air is introduced into a room in the prior art, the indoor environment temperature is easy to change greatly, the opening and closing time of a fresh air system cannot be controlled accurately, and user experience is affected.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for controlling a fresh air system, and an air conditioner, so as to solve the problem that the user experience is affected by accurately controlling the on-off time of the fresh air system in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fresh air system control method comprises the following steps:
acquiring the concentration of indoor carbon dioxide; controlling to start a fresh air unit according to the concentration of indoor carbon dioxide, and introducing fresh air into a room; after the fresh air unit is started, the fresh air unit is controlled to be closed according to the indoor carbon dioxide concentration and the carbon dioxide concentration variation trend; the carbon dioxide concentration variation trend is obtained by detecting the first derivative f (x) of the carbon dioxide concentration. Through the setting of carbon dioxide concentration sensor and new trend unit, set up one set of air conditioning system who improves the fresh degree of room air, through real-time detection indoor carbon dioxide concentration, the first order derivative of accurate calculation carbon dioxide concentration, can be accurate in real time, the concentration change of the indoor carbon dioxide of reliable feedback, it is indoor to realize that accurate regulation and control new trend unit introduces outdoor new trend, opening and closing of control new trend unit, avoid appearing the erroneous judgement because of the signal is unusual, effectively guarantee data accuracy and stability, promote the indoor air quality.
Further, the process of opening the fresh air unit according to indoor carbon dioxide concentration control includes:
the carbon dioxide concentration P in the room exceeds a first preset threshold value PaWhen the fresh air unit is started, the fresh air unit is started; the carbon dioxide concentration P does not exceed a first preset threshold value P in the roomaWhen the air conditioner is in the normal state, the air conditioner is maintained to continuously run in the normal state; the first preset threshold value PaAccording to the comfort level setting of the user, the first preset threshold value PaThe setting is 500-800 PPM. First preset threshold value PaAs a judgment index for measuring the indoor carbon dioxide concentration, when the indoor carbon dioxide concentration P exceeds a first preset threshold PaWhen the indoor air is not fresh, the fresh air unit needs to be started, and fresh air is introduced to supplement fresh air so as to reduce the concentration of carbon dioxide; when the indoor carbon dioxide concentration P does not exceed the first preset threshold value PaAnd when the air conditioner runs, the indoor air quality is good, the comfort level of a user is not influenced, and the air conditioner is kept to continue running in the current state.
Further, the fresh air unit is started, the indoor carbon dioxide concentration is detected once every other first preset time T1, the second preset time T2 is operated, and the first derivative f (x) of the carbon dioxide concentration is detected. The fresh air introduced through the fresh air unit is fully acted indoors, and the detected carbon dioxide concentration can truly reflect the current indoor air state.
Further, when the first derivative f (x) of the carbon dioxide concentration is not less than 0, the fresh air unit is continuously maintained to continuously operate; when the first derivative f (x) of the carbon dioxide concentration is less than 0 and f (x) is less than 0 in at least two continuous periods, monitoring the indoor carbon dioxide concentration, and adjusting the rotating speed of the indoor fan according to the reduction condition of the carbon dioxide concentration. When f (x) is greater than or equal to 0, the carbon dioxide concentration in the room is not continuously reduced; when f (x) is less than 0 and f (x) is less than 0 in M continuous periods, the indoor carbon dioxide concentration is continuously reduced, namely the concentration of the indoor carbon dioxide can be reduced by introducing fresh air through the fresh air unit, the indoor carbon dioxide concentration needs to be monitored, and the rotating speed of the indoor fan is further adjusted according to the reduction condition of the carbon dioxide concentration.
Further, according to the reduction of the carbon dioxide concentration, the process of adjusting the rotating speed of the indoor fan comprises the following steps: the carbon dioxide concentration P in the room is reduced to a second preset threshold value PbWhen the indoor carbon dioxide concentration is lower than the first threshold value, increasing the rotating speed of the indoor fan by the second variable quantity delta 2 to obtain the indoor carbon dioxide concentration P, and calculating and judging the first derivative f (x) of the carbon dioxide concentration; the carbon dioxide concentration P in the room is not reduced to a second preset threshold value PbWhen the air conditioner is started, the rotating speed of the indoor fan is increased by a first variable quantity delta 1, and the fresh air unit continues to operate; where Δ 2 > Δ 1, the second predetermined threshold value PbAccording to the user comfort level setting, a second preset threshold value PbThe setting is 400-600 PPM. When the indoor carbon dioxide concentration is reduced to an ideal value, the rotating speed of an indoor fan of the indoor air supply system is fully increased to improve the air supply efficiency, so that the carbon dioxide concentration of each indoor part can quickly reach the ideal value, and the comfort level of a user is guaranteed.
Further, after the rotating speed of the indoor fan is increased by the second variation delta 2, the indoor carbon dioxide concentration P is obtained, whether the first derivative f (x) of the carbon dioxide concentration is greater than 0 or not is calculated and judged, and the fresh air unit is controlled to be closed according to f (x).
Further, when the first derivative f (x) of the carbon dioxide concentration is greater than 0, the fresh air unit is in a continuous opening state and continues to operate; when the first derivative f (x) of the carbon dioxide concentration is less than or equal to 0, the fresh air unit is closed. When f (x) is greater than 0, the carbon dioxide concentration in the room is reduced to a second preset threshold value PbAfter that, the indoor carbon dioxide concentration does not continuously decrease but rather rises, the fresh air unit needs to be kept in a continuously opened state to continuously operate, and the operation returns to the step S1 to detect the carbon dioxide concentration; when f (x) is less than or equal to 0, no erroneous judgment is made, and the carbon dioxide concentration is reduced to the first preset threshold value PbAnd then, the air inlet is continuously descended, and the fresh air unit is closed.
Further, the first preset time T1 is set according to the cooling/heating efficiency of the air conditioner, the first preset time is set to be 30-100 s, and the second preset time T2 is set to be 0.5-2 h.
Compared with the prior art, the fresh air system control method has the following advantages:
through the setting of carbon dioxide concentration sensor and new trend unit, a set of air conditioning system who improves the fresh degree of room air has been built, through the indoor carbon dioxide concentration of real-time detection, the first order derivative of accurate calculation carbon dioxide concentration, can be accurate in real time, the concentration change of the indoor carbon dioxide of reliable feedback, it is indoor to realize that accurate regulation and control new trend unit introduces outdoor new trend, simultaneously through the algorithm discernment of the first order derivative of many times calculation carbon dioxide concentration, control opening and closing of new trend unit, avoid appearing the erroneous judgement because of the signal is unusual, effectively guarantee data accuracy and stability, promote the indoor air quality.
The invention also provides a fresh air system control device, which comprises:
the detection unit is arranged on the indoor unit and used for detecting the concentration of indoor carbon dioxide;
the fresh air unit is used for introducing outdoor fresh air into a room and comprises an air inlet end and an air outlet end, wherein the air inlet end is arranged on the outdoor side, and the air outlet end is arranged on the indoor side;
the air supply system is arranged in the indoor unit and used for supplying fresh air introduced by the fresh air unit to various indoor places;
the judging unit is used for judging whether the indoor carbon dioxide concentration exceeds a first preset threshold and a second preset threshold, calculating a first derivative f (x) of the indoor carbon dioxide concentration at the same time, and judging whether f (x) is greater than 0;
and the control unit is used for controlling the opening of the fresh air unit and adjusting the air output of the air supply system according to the information of the detection unit and the judgment unit.
The present invention also provides an air conditioner, comprising: the fresh air system control method comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and run by the processor, the fresh air system control method is realized.
Compared with the prior art, the air conditioner and the fresh air system control method have the same advantages, and are not repeated herein.
Drawings
FIG. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control method of a fresh air system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a control method of a fresh air system according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a fresh air system control method according to a second embodiment of the present invention;
fig. 5 is a schematic view of a control method of a fresh air system according to a third embodiment of the present invention.
Description of reference numerals:
1-compressor, 2-four-way valve, 3-outdoor heat exchanger, 4-throttling device, 5-indoor heat exchanger, 6-muffler, 7-filter, 8-exhaust pipe, 11-exhaust temperature sensor, 31-outer coil temperature sensor, 32-outer ring temperature sensor, 51-inner coil temperature sensor, 52-inner ring temperature sensor, 53-air pump, 54-carbon dioxide concentration sensor, 55-air purification device, 56-air pipe, 57-filter layer
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 and 2, the present invention provides a method for controlling a fresh air system, which is used for an air conditioner, and the method for controlling the fresh air system comprises the following steps:
step S1, acquiring indoor carbon dioxide concentration;
a carbon dioxide concentration sensor is arranged on the indoor machine side and used for detecting the indoor carbon dioxide concentration and judging the indoor air quality according to the indoor carbon dioxide content.
Specifically, the indoor carbon dioxide concentration P is obtained when the air conditioner is in a working state, and when the carbon dioxide concentration is high, it indicates that the indoor air is not fresh, and fresh air needs to be introduced to reduce the indoor carbon dioxide concentration. Wherein, the air conditioner is in the operating condition: a state where the air conditioner is operated in a cooling mode or in a heating mode.
Further, the carbon dioxide concentration sensor is set as an infrared carbon dioxide sensor MINIR, and the principle of the infrared carbon dioxide sensor is as follows: the carbon dioxide has an absorption effect on infrared radiation of a specific waveband, so that the radiation energy is weakened when air penetrates through the sensor, and the weakening degree depends on the content of the carbon dioxide in the air, so that the infrared carbon dioxide sensor can be used for accurately detecting the content of the carbon dioxide in the air.
For guaranteeing the real-time detection to carbon dioxide concentration, set for carbon dioxide concentration sensor every first preset time T1 in this embodiment and acquire the carbon dioxide concentration under the current state once and be used for follow-up judgement and calculation, guarantee the real-time accurate detection of carbon dioxide content in the air, the fresh degree of the follow-up accurate control room air of being convenient for.
The first preset time T1 is set according to the cooling/heating efficiency of the air conditioner, and preferably, the first preset time is set to be 30-100 s.
Step S2, controlling to start a fresh air unit according to the indoor carbon dioxide concentration P, and introducing fresh air into the room;
when the concentration P of the indoor carbon dioxide is higher, the indoor air is not fresh, fresh air needs to be introduced, and fresh air is supplemented to reduce the concentration of the carbon dioxide; when the concentration of the carbon dioxide is lower, the indoor air quality condition is good, and the comfort degree of a user cannot be influenced.
Specifically, a first preset threshold value P is setaAs a judgment index for measuring the indoor carbon dioxide concentration, when the indoor carbon dioxide concentration P exceeds a first preset threshold PaWhen the indoor air is not fresh, the fresh air unit needs to be started, and fresh air is introduced to supplement fresh air so as to reduce the concentration of carbon dioxide; when the indoor carbon dioxide concentration P does not exceed the first preset threshold value PaAnd when the air conditioner runs, the indoor air quality is good, the comfort level of a user is not influenced, and the air conditioner is kept to continue running in the current state.
Wherein, the first preset threshold value PaAccording to the user comfort level setting, preferably, the first preset threshold value PaA first predetermined threshold value P for a critical value of carbon dioxide concentration at which the user feels discomfortaThe setting is 500-800 PPM. The fresh air unit is set to introduce fresh air to the room to reduce carbon dioxide concentration, guarantee air cleanliness and anion concentration simultaneously, improve the indoor air quality.
Step S3, after the fresh air unit is started, the fresh air unit is controlled to be closed according to the indoor carbon dioxide concentration and the carbon dioxide concentration variation trend in a plurality of continuous periods;
after the fresh air unit is started, the indoor carbon dioxide concentration is continuously detected, and whether the concentration of the indoor carbon dioxide can be reduced by introducing fresh air or not is judged according to the indoor carbon dioxide concentration and the carbon dioxide concentration variation trend in a plurality of continuous periods.
If after the fresh air unit is started, the concentration of the indoor carbon dioxide is judged to be continuously reduced according to the change trend of the concentration of the indoor carbon dioxide, the concentration of the indoor carbon dioxide can be reduced by introducing fresh air, then the fresh air can be sent to each indoor part through an indoor unit air supply system, and meanwhile, the fresh air unit can be controlled to be closed or kept to be continuously opened according to the requirement by combining the indoor environment temperature.
If the indoor carbon dioxide concentration is judged not to be continuously reduced according to the indoor carbon dioxide concentration change trend after the fresh air unit is started, it is indicated that the amount of fresh air supplied by the fresh air unit is limited under the current state, the indoor carbon dioxide concentration cannot be effectively reduced, the fresh air unit needs to be continuously maintained to work, and the step S1 is returned to obtain the indoor carbon dioxide concentration.
Wherein, the carbon dioxide concentration change trend in the room is obtained by detecting and calculating the first derivative f (x) of the carbon dioxide concentration. (x) is (P2-P1)/T, where P2 is the indoor carbon dioxide concentration at the current state, P1 is the indoor carbon dioxide concentration at the previous time, and T is a unit time, and preferably, the unit time T may be set to a first preset time, and one detection period is set at intervals of the first preset time.
Further, the fresh air unit is started, the indoor carbon dioxide concentration is detected once every a first preset time T1, and after the operation for a second preset time T2, the first derivative f (x) of the carbon dioxide concentration is detected and calculated. The fresh air introduced through the fresh air unit is fully acted indoors, and the detected carbon dioxide concentration can truly reflect the current indoor air state.
Wherein second preset time T2 sets up to 0.5~2h, guarantees that the new trend that new trend unit introduced to indoor has fully diffused, has reached the effect that fully reduces indoor carbon dioxide concentration. Preferably, the second preset time T2 is set to 1 h.
When f (x) is greater than or equal to 0, the indoor carbon dioxide concentration is not continuously reduced, the fresh air unit is continuously maintained to continuously operate, and meanwhile, the step S1 is returned to, and the indoor carbon dioxide concentration is continuously detected.
When f (x) is less than 0 and f (x) is less than 0 in M continuous periods, the indoor carbon dioxide concentration is continuously reduced, namely the concentration of the indoor carbon dioxide can be reduced by introducing fresh air through the fresh air unit, the indoor carbon dioxide concentration needs to be monitored, and the rotating speed of the indoor fan is further adjusted according to the reduction condition of the carbon dioxide concentration. The value of M is 1-10, and preferably, the value of M is 2.
According to the reduction condition of the carbon dioxide concentration, the process of adjusting the rotating speed of the indoor fan comprises the following steps:
when the indoor carbon dioxide concentration is judged to continuously decrease, the indoor carbon dioxide concentration P is obtained, and whether the indoor carbon dioxide concentration P decreases to a second preset threshold value P or not is judgedbIf the indoor carbon dioxide concentration P is not reduced to the second predetermined threshold value PbWhen the indoor carbon dioxide concentration is reduced, the fresh air can be sent to each indoor part through the indoor air supply system, but the indoor carbon dioxide concentration is not reduced to an ideal value, and the fresh air unit is required to keep running continuously.
If the indoor carbon dioxide concentration P is reduced to a second preset threshold value PbWhen following, explain that can effectively reduce indoor carbon dioxide concentration through new trend unit introduction new trend, each position indoor is sent to the accessible indoor air supply system with fresh air, and indoor carbon dioxide concentration has reduced to the ideal value, can close new trend unit.
Wherein the second preset threshold value PbAccording to the user comfort level setting, preferably, the second preset threshold value PbA second predetermined threshold value P for the desired carbon dioxide concentration value for the comfort of the userbThe setting is 400-600 PPM.
When fresh air is sent to each indoor part through the indoor air supply system, the air supply efficiency can be increased by increasing the rotating speed of an indoor fan of the indoor air supply system.
Specifically, the carbon dioxide concentration P does not decrease to the second preset threshold P in the roombWhen the air conditioner is started, the rotating speed of the indoor fan is increased by a first variable quantity delta 1, and the fresh air unit keeps running continuously; the carbon dioxide concentration P in the room is reduced to a second preset threshold value PbAnd when the indoor fan rotates below the second variation delta 2, the indoor carbon dioxide concentration P is obtained, and the first derivative f (x) for judging the carbon dioxide concentration is calculated.
Wherein, Δ 2 is greater than Δ 1, for example Δ 2 sets up to 100rpm, Δ 1 sets up to 50rpm for when indoor carbon dioxide concentration has reduced to the ideal value, fully increase indoor fan rotational speed of indoor air supply system and improve and increase air supply efficiency, and then make the carbon dioxide concentration of indoor each position can both reach the ideal value fast, guarantee user's comfort level.
Further, the carbon dioxide concentration P is reduced to a second preset threshold value P in the roombWhen following, for fully guaranteeing that indoor carbon dioxide concentration is stable in the comfortable within range of user, avoid the erroneous judgement that the signal is unusual to be brought, can not close the new trend unit temporarily, judge through the trend of change that detects indoor carbon dioxide once more whether need close the new trend unit, realize carrying out many times judgement to carbon dioxide concentration change, effectively guarantee accurate definite and stability of data, improve whole control process's stability.
In particular, the carbon dioxide concentration P is reduced to a second preset threshold value P in the roombAnd then, when the rotating speed of an indoor fan of the indoor air supply system is increased by a second variable quantity delta 2, acquiring the indoor carbon dioxide concentration P, calculating and judging whether a first derivative f (x) of the carbon dioxide concentration is greater than 0, and controlling the fresh air unit to be closed according to f (x).
When f (x) is greater than 0, the carbon dioxide concentration in the room is reduced to a second preset threshold value PbAfter that, the indoor carbon dioxide concentration does not continuously decrease but rather rises, the fresh air unit needs to be kept in a continuously opened state to continuously operate, and the operation returns to the step S1 to detect the carbon dioxide concentration; when f (x) is less than or equal to 0, no erroneous judgment is made, and the carbon dioxide concentration is reduced to the first preset threshold value PbAnd then, the air inlet is continuously descended, and the fresh air unit is closed.
Furthermore, after closing the new trend unit, in order to keep indoor air quality, the accessible is opened indoor purifier and is kept indoor air freshness.
According to the fresh air system control method provided by the embodiment, the indoor carbon dioxide concentration is detected in real time, the first-order derivative of the carbon dioxide concentration is accurately calculated, the concentration change of the indoor carbon dioxide can be accurately and reliably fed back in real time, accurate regulation and control are realized, meanwhile, misjudgment caused by signal abnormality is avoided by calculating the first-order derivative of the carbon dioxide concentration for multiple times, and the data accuracy and stability are effectively guaranteed.
As a part of the embodiment of the present invention, as shown in fig. 3, the embodiment provides a control method of a fresh air system, including the following steps:
step S1, starting an air conditioner to obtain the concentration of indoor carbon dioxide;
the air conditioner starts to operate in a set mode, meanwhile, the carbon dioxide concentration sensor is started, the concentration of indoor carbon dioxide is detected, and the indoor air quality condition is judged according to the concentration of the indoor carbon dioxide.
Set for carbon dioxide concentration sensor every first preset time T1 in this embodiment and acquire carbon dioxide concentration under the current state once and be used for follow-up judgement and calculation, guarantee the real-time accurate detection of carbon dioxide content in the air, the fresh degree of the indoor air of the accurate control of follow-up of being convenient for.
The first preset time T1 is set according to the cooling/heating efficiency of the air conditioner, and preferably, the first preset time is set to 60 s.
Step S21, judging whether the indoor carbon dioxide concentration exceeds a first preset threshold value PaIf yes, executing step S31 to start the fresh air unit; if not, step S22 is executed.
For example, a first preset threshold value PaAnd setting the indoor carbon dioxide concentration to be 700PPM, and when the indoor carbon dioxide concentration is detected to be 780PPM, indicating that the indoor carbon dioxide concentration exceeds a first preset threshold value, and starting a fresh air unit.
And step S22, keeping the air conditioner running continuously in the current state.
S31, starting the fresh air unit, continuously operating for a second preset time T2, and detecting the indoor carbon dioxide concentration once every other first preset time T1; preferably, the second preset time T2 is 60min, and step S32, detecting and calculating the first derivative f (x) of the carbon dioxide concentration;
step S33, determining whether f (x) is greater than or equal to 0, if yes, executing step S34; if not, go to step S35;
when f (x) is greater than or equal to 0, it indicates that the indoor carbon dioxide concentration does not continuously decrease, step S34 is executed, the fresh air unit is continuously maintained to continue operating, and the process returns to step S1 to continuously detect the indoor carbon dioxide concentration.
When f (x) is less than 0 and f (x) is less than 0 in M continuous periods, it indicates that the indoor carbon dioxide concentration is continuously reduced, that is, the fresh air is introduced through the fresh air unit to effectively reduce the indoor carbon dioxide concentration, step S35 is executed to monitor the indoor carbon dioxide concentration, further judge the reduction situation of the carbon dioxide concentration, and judge whether the fresh air unit needs to be closed. The value of M is 1-10, and preferably, the value of M is 2.
S34, maintaining the fresh air system to continue running, and returning to S1;
step S35, monitoring the indoor carbon dioxide concentration;
step S36, judging whether the indoor carbon dioxide concentration is larger than a second preset threshold value Pb(ii) a If yes, the indoor carbon dioxide concentration is not reduced to the second preset threshold value PbThen, step S37 is executed, and if not, the indoor carbon dioxide concentration P is decreased to the second preset threshold PbThereafter, step S38 is executed.
For example, the second preset threshold PbAnd setting the indoor carbon dioxide concentration to be 550PPM, when the indoor carbon dioxide concentration is detected to be 600PPM, indicating that the indoor carbon dioxide concentration P is not reduced to be below a second preset threshold value, properly increasing the indoor air supply volume of the indoor air supply system, keeping the fresh air unit to continue to operate, returning to the step S1, and detecting the carbon dioxide concentration.
And S37, the fresh air unit keeps running continuously, meanwhile, the indoor air supply system supplies fresh air to each indoor part, the rotating speed of the indoor fan is increased by the first variable quantity delta 1, the fresh air unit is maintained to work continuously, and the step S1 is returned to detect the concentration of carbon dioxide.
And step S38, the indoor air supply system supplies fresh air to each part indoors, the rotating speed of the indoor fan is increased by the second variable quantity delta 2, and the fresh air unit is closed.
As a part of the embodiment of the present invention, as shown in fig. 4, the embodiment provides a control method of a fresh air system, including the following steps:
step S1, starting an air conditioner to obtain the concentration of indoor carbon dioxide;
the air conditioner starts to operate in a set mode, meanwhile, the carbon dioxide concentration sensor is started, the concentration of indoor carbon dioxide is detected, and the indoor air quality condition is judged according to the concentration of the indoor carbon dioxide.
Set for carbon dioxide concentration sensor every first preset time T1 in this embodiment and acquire carbon dioxide concentration under the current state once and be used for follow-up judgement and calculation, guarantee the real-time accurate detection of carbon dioxide content in the air, the fresh degree of the indoor air of the accurate control of follow-up of being convenient for.
The first preset time T1 is set according to the cooling/heating efficiency of the air conditioner, and preferably, the first preset time is set to 60 s.
Step S21, judging whether the indoor carbon dioxide concentration exceeds a first preset threshold value PaIf yes, executing step S31 to start the fresh air unit; if not, step S22 is executed.
For example, a first preset threshold value PaAnd setting the indoor carbon dioxide concentration to be 700PPM, and when the indoor carbon dioxide concentration is detected to be 780PPM, indicating that the indoor carbon dioxide concentration exceeds a first preset threshold value, and starting a fresh air unit.
And step S22, keeping the air conditioner running continuously in the current state.
S31, starting a fresh air unit, continuously operating for a second preset time T2, and continuously detecting the indoor carbon dioxide concentration; preferably, the second preset time T2 is 60min,
step S32, detecting and calculating the first derivative f (x) of the carbon dioxide concentration;
step S33, determining whether f (x) is greater than or equal to 0, if yes, executing step S34; if not, go to step S35;
when f (x) is greater than or equal to 0, it indicates that the indoor carbon dioxide concentration does not continuously decrease, step S34 is executed, the fresh air unit is continuously maintained to continue operating, and the process returns to step S1 to continuously detect the indoor carbon dioxide concentration.
When f (x) is less than 0 and f (x) is less than 0 in M continuous periods, it indicates that the indoor carbon dioxide concentration is continuously reduced, that is, the fresh air is introduced through the fresh air unit to effectively reduce the indoor carbon dioxide concentration, step S35 is executed to monitor the indoor carbon dioxide concentration, further judge the reduction situation of the carbon dioxide concentration, and judge whether the fresh air unit needs to be closed. The value of M is 1-10, and preferably, the value of M is 2.
S34, keeping the fresh air unit running continuously, and returning to S1;
step S35, monitoring the indoor carbon dioxide concentration;
step S36, judging whether the indoor carbon dioxide concentration is larger than a second preset threshold value Pb(ii) a If yes, the indoor carbon dioxide concentration is not reduced to the second preset threshold value PbThen, step S37 is executed, and if not, the indoor carbon dioxide concentration P is decreased to the second preset threshold PbThereafter, step S38 is executed.
For example, the second preset threshold PbSet to 550PPM, when detecting that the indoor carbon dioxide concentration is 500PPM, it indicates that the indoor carbon dioxide concentration P has decreased to below the second preset threshold, step S38 is executed to increase the amount of air supplied to the room by the indoor air supply system, and detect the indoor carbon dioxide concentration.
And S37, the fresh air unit keeps running continuously, meanwhile, the indoor air supply system supplies fresh air to each indoor part, the rotating speed of the indoor fan is increased by the first variable quantity delta 1, the fresh air unit is maintained to work continuously, and the step S1 is returned to detect the concentration of carbon dioxide.
And S38, the indoor air supply system supplies fresh air to each part of the room, the rotating speed of the indoor fan is increased by the second variable quantity delta 2, the indoor carbon dioxide concentration is detected, and the step S39 is executed.
Step S39, judging whether the first derivative f (x) of the carbon dioxide concentration is larger than 0, if so, executing step S40, continuing to operate the fresh air unit, and if not, executing step S41.
And S40, keeping the fresh air unit in a continuous opening state, continuously operating, returning to the S1, and continuously detecting the indoor carbon dioxide concentration.
And step S41, closing the fresh air unit.
As a part of the embodiment of the present invention, as shown in fig. 5, the embodiment provides a control method of a fresh air system, including the following steps:
step S1, starting an air conditioner to obtain the concentration of indoor carbon dioxide;
the air conditioner starts to operate in a set mode, meanwhile, the carbon dioxide concentration sensor is started, the concentration of indoor carbon dioxide is detected, and the indoor air quality condition is judged according to the concentration of the indoor carbon dioxide.
Set for carbon dioxide concentration sensor every first preset time T1 in this embodiment and acquire carbon dioxide concentration under the current state once and be used for follow-up judgement and calculation, guarantee the real-time accurate detection of carbon dioxide content in the air, the fresh degree of the indoor air of the accurate control of follow-up of being convenient for.
The first preset time T1 is set according to the cooling/heating efficiency of the air conditioner, and preferably, the first preset time is set to 60 s.
Step S21, judging whether the indoor carbon dioxide concentration exceeds a first preset threshold value PaIf yes, executing step S31 to start the fresh air unit; if not, step S22 is executed.
For example, a first preset threshold value PaAnd setting the indoor carbon dioxide concentration to be 700PPM, and when the indoor carbon dioxide concentration is detected to be 660PPM, indicating that the indoor carbon dioxide concentration does not exceed a first preset threshold value, and maintaining the air conditioner to continuously operate in the current state.
And step S22, keeping the air conditioner running continuously in the current state.
And step S31, opening a fresh air unit to reduce the indoor carbon dioxide concentration.
As a part of the embodiment of the present invention, there is also provided a fresh air system control device including:
the detection unit is arranged on the indoor unit and used for detecting the concentration of indoor carbon dioxide; preferably, the detection unit is provided as a carbon dioxide concentration sensor 54, more preferably as an infrared carbon dioxide sensor MINIR.
The fresh air unit is used for introducing outdoor fresh air into the room to reduce the concentration of indoor carbon dioxide; preferably, the fresh air unit in this embodiment includes an air pump 53 and an air pipe 56, the air pump 53 is set to be powered by dc, and the amount of compressed air is changed by adjusting the rotation speed of the motor, so as to change the amount of fresh air introduced from the outdoor to the indoor. More preferably, the fresh air unit comprises an air inlet end and an air outlet end, the air inlet end is arranged on the outdoor side, the air pump 53 is arranged on the indoor side as the air outlet end, and the air inlet end is communicated with the air outlet end through an air pipe 56, so that air on the outdoor side is introduced into the indoor side. The air inlet end is provided with a filter layer for preliminarily filtering the air entering the room through the air pipe 56 and the air pump 53, and the influence on the turbidity of the indoor air when outdoor fresh air is introduced is prevented.
The air supply system is arranged in the indoor unit and used for supplying fresh air introduced by the fresh air unit to various indoor places; preferably, the air supply system is configured as an indoor fan.
The judging unit is used for judging whether the indoor carbon dioxide concentration exceeds a first preset threshold and a second preset threshold, calculating a first derivative f (x) of the indoor carbon dioxide concentration at the same time, and judging whether f (x) is greater than 0;
and the control unit is used for controlling the opening of the fresh air unit and adjusting the air output of the air supply system according to the information of the detection unit and the judgment unit.
As part of the embodiment of the present invention, an air conditioner is further provided, as shown in fig. 1, including a computer readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the fresh air system control method.
The air conditioner of this embodiment further includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4, and an indoor heat exchanger 5, wherein an exhaust pipe 8 of the compressor 1 is communicated with the four-way valve 2, a return air pipe 6 of the compressor 1 is disposed behind the outdoor heat exchanger 3 and the indoor heat exchanger 5, and the throttling device 4 is disposed as an electronic expansion valve.
Taking the cooling mode as an example, the outdoor heat exchanger 3 is a condenser, and the indoor heat exchanger 5 is an evaporator. When the air conditioner performs a refrigeration cycle, a refrigerant is compressed into high-temperature high-pressure gas through the compressor 1, high-temperature high-pressure gaseous refrigerant flows to the four-way valve 2 through the exhaust pipe 8, oil ports AB in the four-way valve 2 are communicated, the high-temperature high-pressure gaseous refrigerant flows to the outdoor heat exchanger 3 to release heat, the high-temperature high-pressure gaseous refrigerant is converted into high-temperature high-pressure liquid refrigerant after heat exchange through the outdoor heat exchanger 3, the high-temperature high-pressure liquid refrigerant flows through the throttling device 4 to be converted into low-temperature low-pressure liquid refrigerant through throttling, the low-temperature low-pressure liquid refrigerant flows to the indoor heat exchanger 5 to absorb heat, the low-temperature low-pressure gaseous refrigerant is converted into low-temperature low-pressure gaseous refrigerant after heat exchange through the evaporator, the oil ports DC in the four-way valve 2 are communicated, the low-temperature low-pressure gaseous refrigerant flows to the gas return pipe 6 through the gas return pipe 12 to return to the compressor 1, and a next round of refrigeration cycle is started.
An exhaust temperature sensor 11 is arranged on the exhaust pipe 8 of the compressor and used for detecting the exhaust temperature of the compressor; an external coil temperature sensor 31 and an ambient temperature sensor 32 are arranged on the outdoor heat exchanger 3 and are respectively used for detecting the temperature of the external coil and the outdoor ambient temperature; an inner coil temperature sensor 51 and an inner ring temperature sensor 52 are provided on the indoor heat exchanger 5, and are used to detect an inner coil temperature and an indoor ambient temperature, respectively.
Further, an air cleaning device 55 is further provided at the indoor side, and preferably, the air cleaning device 55 is provided on the indoor heat exchanger 5 for cleaning the indoor air and maintaining the freshness of the indoor air.
Furthermore, a filter 7 is arranged between the outdoor heat exchanger 3 and the throttling device 4 and used for filtering foreign matters in the refrigerant, maintaining the stability of the refrigerant circulation process and further ensuring the stable operation of the air conditioner.
As a part of the embodiments of the present invention, a computer-readable storage medium is further provided, where a computer program is stored, and when the computer program is read and executed by a processor, the fresh air system control method is implemented as described above.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A fresh air system control method is characterized by comprising the following steps:
acquiring the concentration of indoor carbon dioxide;
controlling to start a fresh air unit according to the concentration of indoor carbon dioxide, and introducing fresh air into a room;
after the fresh air unit is started, the fresh air unit is controlled to be closed according to the indoor carbon dioxide concentration and the carbon dioxide concentration variation trend; the carbon dioxide concentration change trend is obtained by detecting the first derivative f (x) of the carbon dioxide concentration;
when the first derivative f (x) of the carbon dioxide concentration is not less than 0, the fresh air unit is continuously maintained to continuously operate;
when the first derivative f (x) of the carbon dioxide concentration is less than 0 and f (x) is less than 0 in at least two continuous periods, monitoring the indoor carbon dioxide concentration, and adjusting the rotating speed of an indoor fan according to the reduction condition of the carbon dioxide concentration;
according to the reduction condition of the carbon dioxide concentration, the process of adjusting the rotating speed of the indoor fan comprises the following steps:
when the indoor carbon dioxide concentration P is reduced to be below a second preset threshold Pb, the rotating speed of the indoor fan is increased by a second variable quantity delta 2, the indoor carbon dioxide concentration P is obtained, and a first derivative f (x) for judging the carbon dioxide concentration is calculated;
when the indoor carbon dioxide concentration P is not reduced to be below a second preset threshold Pb, the rotating speed of the indoor fan is increased by a first variable quantity delta 1, and the fresh air unit continues to operate;
the second preset threshold Pb is set according to the comfort level of a user, and is set to be 400-600 PPM;
after the rotating speed of the indoor fan is increased by the second variation delta 2, the indoor carbon dioxide concentration P is obtained, whether the first derivative f (x) of the carbon dioxide concentration is larger than 0 or not is calculated and judged, and when the first derivative f (x) of the carbon dioxide concentration is larger than 0, the fresh air unit is in a continuous opening state and continues to operate; when the first derivative f (x) of the carbon dioxide concentration is less than or equal to 0, the fresh air unit is closed.
2. The fresh air system control method as claimed in claim 1, wherein the control is performed according to indoor carbon dioxide concentration
The process of opening the fresh air unit includes:
when the indoor carbon dioxide concentration P exceeds a first preset threshold Pa, starting a fresh air unit;
when the indoor carbon dioxide concentration P does not exceed a first preset threshold Pa, the air conditioner is maintained to continue to operate in the current state;
the first preset threshold Pa is set according to the comfort level of a user, and the first preset threshold Pa is set to be 500-800 PPM.
3. The fresh air system control method as claimed in claim 1, wherein the fresh air unit is turned on while detecting the indoor carbon dioxide concentration every first preset time T1, and the second preset time T2 is operated while detecting the first derivative f (x) of the carbon dioxide concentration.
4. The fresh air system control method according to claim 3, wherein the first preset time T1 is set according to cooling/heating efficiency of the air conditioner, the first preset time is set to 30-100 s, and the second preset time T2 is set to 0.5-2 h.
5. A fresh air system control device capable of implementing the fresh air system control method according to any one of claims 1 to 4, the fresh air system control device comprising:
the detection unit is arranged on the indoor unit and used for detecting the concentration of indoor carbon dioxide;
the fresh air unit is used for introducing outdoor fresh air into a room and comprises an air inlet end and an air outlet end, wherein the air inlet end is arranged on the outdoor side, and the air outlet end is arranged on the indoor side;
the air supply system is arranged in the indoor unit and is used for supplying air introduced by the fresh air unit to all parts in the room;
the judging unit is used for judging whether the indoor carbon dioxide concentration exceeds a first preset threshold and a second preset threshold, calculating a first derivative f (x) of the indoor carbon dioxide concentration at the same time, and judging whether f (x) is greater than 0;
and the control unit is used for controlling the opening of the fresh air unit and adjusting the air output of the air supply system according to the information of the detection unit and the judgment unit.
6. An air conditioner, comprising: comprising a computer-readable storage medium and a processor, in which a computer program is stored, which computer program, when read and executed by the processor, implements the fresh air system control method according to any of claims 1 to 4.
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| CN113606660B (en) * | 2021-08-04 | 2022-07-12 | 珠海格力电器股份有限公司 | Air conditioner fresh air control method and air conditioner |
| CN113970177B (en) * | 2021-10-26 | 2022-12-09 | 珠海格力电器股份有限公司 | Fresh air intake control method and device, refrigeration system and air conditioner |
| CN114110988A (en) * | 2021-11-17 | 2022-03-01 | 珠海格力电器股份有限公司 | Control method for automatic ventilation of fresh air conditioner and fresh air conditioner |
| CN115355608A (en) * | 2022-07-01 | 2022-11-18 | 宁波奥克斯电气股份有限公司 | Control method and control device for preventing peculiar smell of air conditioner and air conditioner |
| CN116858440B (en) * | 2023-09-05 | 2023-12-08 | 百穰新能源科技(深圳)有限公司 | Leakage detection method and device, leakage disposal method and device, and processing system |
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| CN109268943B (en) * | 2018-09-06 | 2021-04-09 | 广东美的制冷设备有限公司 | Air conditioner, method and apparatus for controlling the same, and computer-readable storage medium |
| CN109724226B (en) * | 2018-12-13 | 2021-05-25 | 青岛海尔空调器有限总公司 | Control method of air conditioner |
| CN109812937B (en) * | 2019-02-25 | 2020-11-27 | 奥克斯空调股份有限公司 | Fresh air control method based on carbon dioxide concentration, fresh air control device and air conditioner |
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