CN116734365A - Fresh air system and control method thereof - Google Patents
Fresh air system and control method thereof Download PDFInfo
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- CN116734365A CN116734365A CN202210202672.5A CN202210202672A CN116734365A CN 116734365 A CN116734365 A CN 116734365A CN 202210202672 A CN202210202672 A CN 202210202672A CN 116734365 A CN116734365 A CN 116734365A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 84
- 238000012937 correction Methods 0.000 claims description 27
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 abstract description 14
- 238000004134 energy conservation Methods 0.000 abstract description 11
- 239000003507 refrigerant Substances 0.000 description 32
- 230000008859 change Effects 0.000 description 11
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- 238000013459 approach Methods 0.000 description 1
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- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
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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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump 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
- F24F11/88—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
- 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
- F24F2110/30—Velocity
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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
- F24F2110/64—Airborne particle content
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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
- F24F2110/66—Volatile organic compounds [VOC]
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
- F24F2110/74—Ozone
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method of a fresh air system, wherein an indoor air supply unit comprises a direct current motor, and the method comprises the following steps: the detection unit detects the indoor air quality every other period and obtains a detection value; the control unit compares the detection value with a preset value, and calculates a first difference value between the detection value and the preset value; when the first difference value is larger than the set value, starting the indoor air supply unit; after the indoor air supply unit is started, the control unit calculates a second difference value between the first difference value obtained in the current period and the first difference value obtained in the previous period, and adjusts the fresh air introduction amount of the indoor air supply unit according to the second difference value. The invention also provides a fresh air system. The invention has the advantages that the accurate regulation and control of the air quantity of the fresh air system are realized by utilizing the excellent speed regulation performance of the direct current motor, so that the energy conservation of the fresh air system is greatly improved on the premise of ensuring the comfort of users.
Description
Technical Field
The invention relates to the technical field of fresh air systems, in particular to a fresh air system and a control method thereof.
Background
Compared with the air internal circulation mode adopted by an air conditioner, the working mode of the fresh air system is a replacement mode which is more beneficial to health, the fresh air system can suck outdoor fresh air into a room, filter and remove dust to the air entering the room, and meanwhile exhaust indoor waste gas is discharged to the outside, so that the room is kept comfortable and smooth.
However, the control mode of the existing fresh air system is single, and the existing fresh air system cannot adapt to indoor environment changes in time, so that the use cost of a user is greatly improved. According to the feedback of the service condition of the existing fresh air system, more than half of users use the fresh air system rarely in daily life due to the fact that the fresh air system is high in energy consumption and high in use cost, and instead, the users are more willing to adopt the traditional methods of opening doors and windows to exchange air.
Disclosure of Invention
The invention aims to provide a control method of a fresh air system, which can adjust the fresh air introduction amount of an indoor air supply unit in real time according to a second difference value, so that good comfort of the fresh air system can be ensured, and energy conservation of the fresh air system can be improved.
The invention provides a control method of a fresh air system, which comprises a detection unit, a control unit and an indoor air supply unit, wherein the indoor air supply unit of the fresh air device comprises a direct current motor; the method comprises the following steps: the detecting unit detects the indoor air quality every other period S and obtains a detection value Z m M is a positive integer; the control unit will detect the value Z m And a preset value Z 0 Comparing and calculating to obtain a detection value Z m And a preset value Z 0 First difference e between m The method comprises the steps of carrying out a first treatment on the surface of the When the first difference e m When the air quantity is larger than the set value L, starting the indoor air supply unit; after the indoor air supply unit is started, the control unit calculates a first difference e obtained in the current period m A first difference e from the previous cycle m-1 Second difference f between m And according to the second difference f m And regulating the fresh air introduction amount of the indoor air supply unit. The invention is based on the first difference e m To control the opening of the indoor air supply unit, and after the indoor air supply unit is opened, according to the second difference f m The fresh air introduction amount of the indoor air supply unit is directly regulated, so that in the working process of the fresh air system, the detection values obtained in all periods are not required to be compared with the preset value to obtain the corresponding fresh air introduction amount, the algorithm is simple, clear and clear, the control is easy, and the frequent start and stop of the fresh air device are avoided.
Preferably, the indoor air supply unit is provided with a plurality of air supply gears, and the higher the air supply gear is, the larger the fresh air introduction amount is; the control unit is based on the second difference f m And switching the air supply gear of the indoor air supply unit. According to the invention, the direct current motor with stepless speed regulation is used for realizing the division of a plurality of air supply gears, so that the fresh air introduction amount of the indoor air supply unit can be regulated more accurately, and the energy conservation of a fresh air system is improved while the comfort of a user is improved.
Preferably, when the second difference f m When the air supply speed is greater than 0, the control unit increases the air supply gear of the indoor air supply unit; when the second difference f m When the air supply speed is equal to 0, the control unit maintains the air supply gear of the indoor air supply unit unchanged;when the second difference f m When the air supply speed is smaller than 0, the control unit reduces the air supply gear of the indoor air supply unit. The invention can be based on the second difference f m The air supply gear is directly regulated, and the control logic is simple and easy to set.
Preferably, the control unit is based on the second difference f m Calculating a fresh air increment, and regulating the fresh air introduction amount of the indoor air supply unit according to the fresh air increment; the calculation formula of the fresh air increment delta Fan is as follows: Δfan=n×f m Wherein the correction amount n>0. The fresh air quantity is adjusted by introducing fresh air increment, the accuracy is higher, the adjusting process is intelligent and efficient, and the use cost of a user is reduced.
Preferably, the control unit adjusts the correction amount according to the detection value, the first difference value and the second difference value, calculates a fresh air increment Δfan according to the first difference value, the second difference value and the adjusted correction amount, and then adjusts the fresh air introduction amount of the indoor air supply unit according to the fresh air increment Δfan. The fresh air introduction is regulated by adopting the fuzzy controller, so that the fresh air introduction amount can be controlled more accurately, the indoor comfort is better, the operation process of the fresh air system is more energy-saving, and the use cost of a user is reduced.
Preferably, the first difference value, the second difference value, and the adjusted correction amount are substituted into a PID algorithm formula, where the PID algorithm formula is: Δfan=kp×n×f m +ki×(S/2×Si)×(e m +e m-1 )+kd×(S/2×Si)×f m . Wherein S is a period, si is a given parameter value; kp, n, ki, kd is the correction amount.
Preferably, the correction amount n is a first difference e obtained with respect to the current period m Variable of (c), when e m When L is less than or equal to, n=0; when L < e m When less than or equal to 0, n and e m Positive correlation; when e m >At 0, n=x; wherein, the setting value L is less than 0, and the setting value X>0。
Preferably, if the first differences obtained in the first set time period are smaller than the set value L, the indoor air supply unit is turned off. The indoor air supply unit can be effectively reduced from repeatedly opening and closing due to the fact that the detection value slightly floats up and down near the set value, and therefore comfort of a user is improved, and service life of a fresh air system is prolonged.
Preferably, the method further comprises the steps of: after the detection unit continuously operates for a second set period of time, the control unit predicts the detection value which can be obtained after the detection unit continuously operates for a third set period of time according to the detection value which is obtained by the detection unit in the second set period of time, obtains a predicted detection result value, and then calculates a fourth difference value between the predicted detection result value and the detection value obtained in the current period. Under the assistance of the detection result preset value, the air quantity of the fresh air system is more intelligent to adjust, and the use experience of a user is better.
Preferably, when the fourth difference is greater than 0, the control unit increases the fresh air introduction amount of the indoor air supply unit. The fresh air introduction amount in the third set time period can be increased in advance, the continuous decrease of the air quality in the third set time period is avoided, and the indoor comfort is improved.
Preferably, when the detection unit is abnormal in communication, the control unit keeps the fresh air introduction amount of the indoor air supply unit unchanged for a fourth set period of time, and then turns off the indoor air supply unit. The arrangement improves the use experience of the user, reduces the energy consumption of the fresh air system and reduces the use cost of the user.
Preferably, the detection unit comprises CO 2 One or more of a sensor, a fine particle sensor, a formaldehyde sensor, a TVOC sensor, a temperature sensor, and a humidity sensor. The detection unit can realize the comprehensive monitoring of indoor air quality, promotes fresh air system air regulation's accuracy.
Preferably, the fresh air system further comprises an air conditioner, and the control unit adjusts the air supply temperature of the indoor air supply unit according to the set temperature T of the air conditioner. According to the set temperature of the air conditioner, the air supply temperature of the fresh air introduced by the fresh air device is adjusted, the linkage control of the air conditioner and the fresh air device is realized, the air supply temperature of the fresh air can be more in line with the system performance requirement, the comfort of a user is met, the energy-saving effect is realized, and the use cost of the user is reduced.
Preferably, the detecting unit includes an indoor temperature sensor detecting an indoor temperature T1 and an outdoor temperature sensor detecting an outdoor temperature T2, and the control unit adjusts the operation state of the fresh air device according to a difference between the indoor temperature T1 and the outdoor temperature T2 and the set temperature T. According to the running state of indoor outer difference in temperature regulation new trend device, can accurate regulation new trend temperature that new trend device introduced, control accuracy is high, more can satisfy user comfort level requirement, and energy-conservation nature is high.
Preferably, the fresh air device further comprises a fresh air heat exchange unit and an electric valve connected with the fresh air heat exchange unit, when |T1-T2| is less than or equal to a set value T 0 When the electric valve is closed; when |T1-T2| > the set value T 0 When the control unit opens the electric valve. The control accuracy is high, the comfort requirement of the user can be met, and the energy conservation is high.
Preferably, the fresh air device further comprises a compressor, and the control unit adjusts the operation frequency of the compressor according to the difference value between the indoor temperature T1 and the outdoor temperature T2 and the set temperature T. The control accuracy is high, the comfort requirement of the user can be met, and the energy conservation is high.
Preferably, the fresh air system includes a plurality of air conditioners each having a set temperature, and the control unit adjusts the supply air temperature of the indoor air supply unit according to an average value of the set temperatures. The air supply temperature of the fresh air is adjusted according to the average value of the set temperatures T of the plurality of air conditioning devices, so that the air supply temperature of the fresh air is closer to the indoor temperature of the area where the plurality of air conditioning devices are located, the energy-saving effect is achieved while the comfort level of users is met, and the use cost of the users is reduced.
The invention also provides a fresh air system which is controlled by adopting the control method.
The invention has the advantages that the direct current motor is adopted, the excellent speed regulation performance of the direct current motor is utilized, the air quantity control method of the fresh air system, in which the fresh air introduction quantity changes along with the second difference value, is provided, the accurate regulation and control of the air quantity of the fresh air system are realized, the energy conservation of the fresh air system is greatly improved, the energy consumption is reduced, the use cost rise caused by a single control mode is avoided, the use of the fresh air system is encouraged by a user, and the waste after purchasing the fresh air system is reduced.
Drawings
FIG. 1 is a schematic diagram of an air volume control flow of a fresh air system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an air volume control flow of a fresh air system according to another embodiment of the present invention;
FIG. 3 shows the correction n with respect to the first difference e in the first/second embodiment m Is a function diagram of (2);
FIG. 4 shows the correction kp with respect to the second difference f in the second embodiment m Is a function diagram of (2);
FIG. 5 shows the correction ki with respect to the detection value Z in the second embodiment m Is a function diagram of (2);
FIG. 6 is a graph showing the third difference g in relation to the correction amount kd in the second embodiment m Is a function diagram of (2);
FIG. 7 is a schematic diagram of the fresh air system of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
< fresh air System >
As shown in fig. 7, the present invention provides a fresh air system, which includes an air conditioner and a fresh air device, wherein the air conditioner includes an air conditioner outdoor unit and an air conditioner indoor unit, heat exchange units are respectively disposed in the air conditioner outdoor unit and the air conditioner indoor unit (i.e. the air conditioner outdoor unit has an outdoor heat exchange unit, the air conditioner indoor unit has an indoor heat exchange unit), the two units are connected by a refrigerant pipe to form a refrigerant loop, and a compressor and an electric valve are disposed in the refrigerant loop. The compressor is used for adjusting the refrigerant circulation quantity in the refrigerant loop, and the electric valve is used for adjusting the refrigerant flow flowing through the heat exchanger. Fans are also respectively arranged in the air conditioner outdoor unit and the air conditioner indoor unit and used for adjusting the air flow passing through the heat exchange unit. The heat exchange amount of the heat exchange unit can be adjusted by adjusting the operation state of the air conditioner. Specifically, the heat exchange amount of the heat exchange unit may be adjusted by one or more of the following three ways: 1) Changing the frequency of the compressor to adjust the circulation quantity of the refrigerant in the refrigerant loop; 2) The opening of the electric valve is regulated to regulate the flow of the refrigerant flowing through the heat exchange unit; 3) The fan gear is adjusted to adjust the air flow through the heat exchange unit. The air conditioner may be connected to one or more indoor units of the air conditioner by one outdoor unit of the air conditioner, or may be connected to a plurality of indoor units of the air conditioner by a plurality of outdoor units of the air conditioner. Each indoor unit of the air conditioner is also provided with a control terminal, the control terminal can be one or more of a wired remote controller, a wireless remote controller and a mobile terminal, and the indoor units of the air conditioner receive user instructions through the control terminals so as to control the running state of the air conditioner according to the user instructions.
The fresh air device comprises a fresh air device indoor unit and a fresh air device outdoor unit, wherein heat exchange units are respectively arranged in the fresh air device outdoor unit and the fresh air device indoor unit (namely, the fresh air device outdoor unit is provided with an outdoor heat exchange unit, the fresh air device indoor unit is provided with a fresh air heat exchange unit), a refrigerant loop is formed by connecting the fresh air device indoor unit and the fresh air device indoor unit through a refrigerant pipe, and a compressor and an electric valve are arranged in the refrigerant loop. The compressor is used for adjusting the refrigerant circulation volume in the refrigerant loop, and the electric valve is used for adjusting the refrigerant flow flowing through the fresh air heat exchange unit. The indoor air supply unit of the indoor unit of the fresh air device is used for adjusting the fresh air quantity introduced by the fresh air device, and the fresh air introduced by the fresh air device can be directly fed into a room or can be subjected to temperature adjustment by the fresh air heat exchange unit and then fed into the room. Through adjusting the running state of new trend device, can adjust the heat exchange volume of new trend heat transfer unit, and then adjust the temperature of the new trend of flowing through new trend heat transfer unit. Specifically, the heat exchange amount of the fresh air heat exchange unit can be adjusted by one or more of the following three modes: 1) Changing the frequency of the compressor to adjust the circulation quantity of the refrigerant in the refrigerant loop; 2) The opening of the electric valve is regulated to regulate the flow of the refrigerant flowing through the fresh air heat exchange unit; 3) And adjusting the fan gear of the indoor air supply unit to adjust the air flow passing through the fresh air heat exchange unit. The fresh air device can be connected with one or more fresh air device indoor units by one fresh air device outdoor unit, and can also be connected with a plurality of fresh air device indoor units by a plurality of fresh air device outdoor units. Each fresh air device indoor unit is also provided with a control terminal, the control terminal can be one or more of a wired remote controller, a wireless remote controller and a mobile terminal, and the fresh air device indoor units receive user instructions through the control terminals so as to control the running state of the fresh air device according to the user instructions, such as adjusting fresh air introduction amount, fresh air refrigerating/heating, fresh air supply temperature and the like.
The fresh air device introduces fresh air through the indoor air supply unit, and the indoor air forms pressure difference, so that the indoor air flows into the outside through ventilation equipment such as door and window gaps or exhaust fans, and ventilation is realized. The indoor air supply unit comprises a direct current motor and a fan. An alternating current motor is commonly adopted in the existing indoor air supply unit, but the alternating current motor has the problems of high power consumption, poor motor rotation speed adjusting capability and the like. The invention adopts the direct current motor, which has lower power consumption than the alternating current motor at the same rotating speed, and can realize stepless speed regulation by matching with the programmable module, thereby enlarging the speed change range and ensuring the accurate regulation of the fresh air introduction amount of the indoor air supply unit.
The fresh air system also comprises a control unit and a detection unit. The control unit is respectively in communication connection with the air conditioning device, the fresh air device and the detection unit, and can be in wired and/or wireless connection, for example, the control unit and the detection unit can be in wireless connection through a router. The control unit can adjust the operation of the fresh air device and the air conditioner according to the detection result of the detection unit.
The detection unit comprises CO 2 One or more of a sensor, a tiny particle sensor, a formaldehyde sensor, a TVOC sensor, a temperature sensor and a humidity sensor, which can transmit feedback signals of information of air parameters (including indoor air quality) in a reaction chamber to a control unit through an integrated installation or a scattered installation mode. The type, the number and the model of the sensor can be selected according to the requirements by a person skilled in the art, and the commercially available sensor products can be adopted, so that the sensor can be matched with different sensor products to form detection according to different functional and precision requirementsThe unit can meet personalized use requirements while improving the universality of the detection unit. The detection unit is usually disposed at any position in the indoor area, such as at the air outlet of the fresh air device, at the air return of the air conditioner, or on a desk, a wall, or on the ground within the range of user activity.
The air conditioner indoor units and the fresh air device can be combined according to the actual requirements of the use environment by a person skilled in the art, so that the optimal energy-saving effect is realized, for example, when the air conditioner comprises a plurality of air conditioner indoor units, all or part of the air conditioner indoor units and the fresh air device can be combined according to the requirements; when the fresh air device is provided with one fresh air device indoor unit, the fresh air device indoor unit can be combined with all or part of the air conditioner indoor units; when the fresh air device is provided with a plurality of fresh air device indoor units, all or part of the fresh air device indoor units and the air conditioner indoor units can be combined according to requirements.
The air conditioner and the fresh air device in the fresh air system can be respectively provided with independent refrigerant loops, for example, the outdoor unit of the air conditioner and the indoor unit of the air conditioner are connected through refrigerant piping to form a refrigerant loop of the air conditioner, and the outdoor unit of the fresh air device and the indoor unit of the fresh air device are connected through refrigerant piping to form a refrigerant loop of the fresh air device; the air conditioner and the fresh air device are respectively provided with an air conditioner indoor unit and a fresh air device indoor unit, but share an outdoor unit, and a fresh air system refrigerant loop is formed among the air conditioner indoor unit, the fresh air device indoor unit and the outdoor unit through refrigerant piping.
< fresh air introduction amount adjustment >
As shown in fig. 1, initially, the indoor air supply unit of the fresh air device indoor unit is in a closed state. The invention provides a control method of a fresh air system, which comprises the following steps:
s1, detecting indoor air quality every other period S by a detection unit, and obtaining a detection value Z m M is a positive integer;
s2, the control unit outputs a detection value Z m And a preset value Z 0 Comparing and calculating to obtain a detection value Z m And a preset value Z 0 First difference e between m I.e. e m ＝Z m -Z 0 ；
S3, when the first difference e m When the air quantity is larger than the set value L, opening the indoor air supply unit, otherwise, keeping the indoor air supply unit in a closed state;
the set value L may be equal to 0, i.e. when the detected value Z m Reaching a preset value Z 0 When the indoor air supply unit is started; the set value L may also be less than 0, i.e. at the detection value Z m Reaching a preset value Z 0 Before, indoor air supply unit opens in advance, improves user's travelling comfort.
S4, after the indoor air supply unit is started, the detection unit still detects the indoor air quality at intervals of a period S, and the control unit calculates a first difference e obtained in the current period m A first difference e from the previous cycle m-1 Second difference f between m ，f m ＝e m -e m-1 ＝(Z m -Z 0 )-(Z m-1 -Z 0 )＝Z m -Z m-1 I.e. the second difference f m At the same time, the detected value Z obtained for the current period m With the detected value Z obtained in the last cycle m-1 Difference between them.
S5, the control unit is used for controlling the second difference f m And regulating the fresh air introduction amount of the indoor air supply unit.
Because the indoor air supply unit adopts the direct current motor capable of realizing stepless speed regulation, the indoor air supply unit is provided with a plurality of air supply gears, the rotating speed of the direct current motor corresponding to the lowest gear of the air supply gears is 0, and the indoor air supply unit is in a closed state; the higher the air supply gear is, the larger the corresponding direct current motor rotating speed is, and the larger the fresh air introduction amount is. Thus, in step S5, the control unit may calculate a second difference f m And switching the air supply gear of the indoor air supply unit.
In the above steps S1-S3, when the detecting unit detects CO 2 A concentration of greater than 700ppm, or PM2.5 of greater than 75ug/m 3 Or formaldehyde/TVOC of greater than 0.1mg/m 3 Or a high temperatureAt 26℃, a first difference e m And when the air quantity is larger than the set value L, starting the indoor air supply unit.
For ease of understanding, the present invention provides a first embodiment, including the steps of:
s10, the detection unit is CO 2 A sensor for detecting CO every 5min 2 The concentration is detected, and CO is obtained 2 Concentration detection value Z m ；
S20, the control unit outputs the detection value Z m And a preset value Z 0 Comparison is carried out with the value of 800ppm, and a detection value Z is calculated m And a preset value Z 0 First difference e between m ；
S30, when the first difference e m Greater than the set value l= -100ppm (i.e. the detection value Z m =700 ppm), the indoor air supply unit is turned on, otherwise the indoor air supply unit is kept in a closed state;
s40, after the indoor air supply unit is started, the detection unit still detects CO every 5min 2 The concentration is detected, and the control unit calculates a second difference f m ；
S51, the control unit is used for controlling the first differential value f m The air supply gear of the indoor air supply unit is switched, and the switching conditions are as follows:
1) When the second difference f m When the speed is greater than 0, the control unit increases the air supply gear:
second difference f m Greater than 0, meaning CO 2 The concentration is rising, and the current fresh air introduction amount of the indoor air supply unit is insufficient to reduce CO 2 The concentration needs to be increased by increasing the fresh air introduction amount, and the indoor CO is treated 2 Diluting;
2) When the second difference f m When equal to 0, the control unit maintains the air supply gear unchanged:
second difference f m Equal to 0, meaning CO 2 The concentration is kept in a stable (or lower) range, so that the current fresh air introduction amount of the indoor air supply unit can be kept unchanged;
3) When the second difference f m When the speed is smaller than 0, the control unit reduces the air supply gear:
second difference f m Less than0 means CO 2 The concentration is being reduced, and from the aspect of energy conservation, the fresh air introduction amount can be properly reduced, and the excessively high energy consumption is avoided.
As can be seen from the first embodiment, the present invention is based on the first difference e m To control the opening of the indoor air supply unit, and after the indoor air supply unit is opened, according to the second difference f m The fresh air introduction amount of the indoor air supply unit is directly regulated, so that the detection values obtained in all periods are not required to be compared with the preset value after the fresh air introduction amount is set to obtain corresponding air supply gears, a large amount of complex calculation is omitted, the algorithm is clearer, the control is easy, and frequent opening and closing are avoided.
In the switching condition 1)/3) of step S51, the person skilled in the art can set the control unit to increase/decrease N blower steps each time, where N is a positive integer, as needed. The control logic is simple and easy to set, and can be adjusted by simple control, but the increased fresh air introduction amount is possibly insufficient to reduce CO 2 Concentration.
Step S51 includes the steps of:
s511, the control unit is used for controlling the first differential value f m Calculating a fresh air increment delta Fan, and then determining a wind sending gear according to the fresh air increment delta Fan; the calculation formula of the fresh air increment delta Fan is as follows:
ΔFan＝n*f m (1)
wherein the correction amount n >0.
In the formula (1), when the correction amount n is a fixed value, f obtained in the current period m The larger the Δfan required for the next cycle, the more the control unit increases the number of air-blowing steps per increase, and vice versa. The flexibility of control is promoted to the setting like this, increases the accuracy of adjusting fresh air introduction.
Further, to enhance the energy saving of the fresh air system, the correction amount n may be set to a first difference e obtained with respect to the current period m The value range of the variable is as follows: when e m When L is less than or equal to, n=0; when L < e m When less than or equal to 0, n and e m Positive correlation; when e m >At 0, n=x. Wherein, the set value L is less than 0,constant value X>0。
Preferably, as shown in fig. 3, l= -100, x=1.7, i.e. when e m N=0 when less than or equal to-100; when-100 < e m When less than or equal to 0, n=0.017 e m +1.7; when e m >At 0, n=1.7.
As can be seen from the combination of (1),
1) If e when the indoor air supply unit is in the closed state m The indoor air supply unit is kept closed if the temperature is less than or equal to-100; if-100 < e m At the moment, CO is less than or equal to 0 2 The concentration gradually rises, f m If the air supply speed is greater than 0, delta Fan is greater than 0, the indoor air supply unit is started in advance, and the air supply gear is along with e m And/or f m Is gradually increased. In CO 2 When the concentration does not reach the preset value, the setting is favorable for improving the comfort of the user, and meanwhile, the use cost is reduced.
2) When the indoor air supply unit is in an open state, if-100 < e m At the moment, CO is less than or equal to 0 2 Gradually decreasing concentration f m If the delta Fan is smaller than 0, and the air supply gear is along with e m And/or f m Slowly decreases until the air supply gear is reduced to the lowest gear, and the indoor air supply unit is turned off. In CO 2 When the concentration is reduced below a preset value, the fresh air introduction amount of the indoor air supply unit can be slowly reduced by the arrangement, and the purpose of reducing the use cost is achieved.
In order to further realize accurate regulation and control of the air quantity of the fresh air system, the invention also provides a second embodiment, and the difference between the second embodiment and the first embodiment is that the step S52 is adopted to replace the step S51.
Step S52 includes: the control unit adjusts the correction amount according to the detection value, the first difference value and the second difference value, substitutes the first difference value, the second difference value and the adjusted correction amount into a PID algorithm formula to obtain a fresh air increment delta Fan, and then switches the air supply gear of the indoor air supply unit according to the fresh air increment delta Fan to adjust the fresh air introduction amount of the indoor air supply unit. The PID algorithm formula is:
ΔFan＝kp×n×f m +ki×(S/2×Si)×(e m +e m-1 )+kd×(S/2×Si)×f m (2)
wherein S is a period, specifically 5min; si is a given parameter value, in particular 3; kp, n, ki, kd is the correction amount.
As shown in fig. 3, in equation (2), the correction amount n is a first difference e obtained with respect to the current period m In CO 2 The concentration is as follows:
if the first difference e obtained in the current period m Within a first setting range, e.g. e m E is-100 ppm to 0ppm m The larger the CO detected in the current period 2 The closer the concentration value is to the preset value Z 0 . At this time n follows e m Is increased with the increase of the gear, and the corresponding change of the air supply gear is also along with e m The indoor air supply unit is ensured to be opened in advance, and the use comfort of a user is improved;
if e m Above 0ppm, it can be seen that the current period of CO 2 The concentration is greater than a preset value Z 0 The indoor air supply unit continuously works, wherein n is a constant value (such as 1.7) which is larger than 0 and is not along with e m The change affects the air supply gear;
if e m Less than-100 ppm, the CO of the current period is known 2 The concentration is far less than the preset value Z 0 At this time, n is 0, which does not affect the change of the air-sending gear.
As shown in fig. 4, in the equation (2), the correction amount kp is the second difference f obtained with respect to the current period m In CO 2 The concentration is as follows:
if the first difference e obtained in the current period m A first difference e from the previous cycle m-1 Second difference f between m Within a first setting range, e.g. f m At-10 ppm to 10ppm, the CO detected in two adjacent periods is known 2 The difference between the concentration values is small, i.e. CO 2 The concentration is in a stable numerical range, and kp is 0 at the moment, so that the change of the air supply gear is not influenced;
if f m Within a second setting range, e.g. f m At-50 ppm to-10 ppm, the CO detected in the current cycle is known 2 Concentration value is smaller than CO detected in previous period 2 Concentration value，f m The smaller the CO 2 The faster the concentration decreases, the more kp follows f m Is increased with the decrease of f, and the air supply gear is also corresponding to the increase of f m Is reduced by the reduction of (2);
if f m Within a third setting range, e.g. f m At 10ppm to 50ppm, the CO detected in the current cycle is known 2 Concentration value is greater than CO detected in previous period 2 Concentration value, f m The larger the CO 2 The faster the concentration rises, the more kp follows f m Is increased with the increase of f, and the air supply gear is also corresponding to the increase of f m Is increased by an increase in (a);
when f m When the absolute value of (C) exceeds a certain value, such as more than 50ppm or less than-50 ppm, the CO of the current period is known 2 The concentration changes sharply, and kp is a constant value greater than 0 (e.g. when f m >Kp=1 at 50; f (f) m <-50, kp=0.5), i.e. kp is not dependent on f m The change further influences the air supply gear, avoids leading to the abnormal sound because of the air supply gear mutation, and then avoids causing the user to listen uncomfortable.
As shown in fig. 5, the correction amount ki is a detection value Z obtained with respect to the current period m In CO 2 The concentration is as follows:
if the detection value Z obtained in the current period m Within a first setting range, e.g. Z m At 750ppm to 850ppm, the CO detected in the current cycle is known 2 The concentration is at a preset value Z 0 Near small fluctuation, ki is 0 at the moment, and the change of the wind sending gear is not influenced;
if Z m Within a second setting range, e.g. Z m At 600ppm to 750ppm, the CO detected in the current period is known 2 The concentration is smaller than a preset value Z 0 Ki is now Z-dependent m Is decreased by an increase in (a);
if Z m Within a third setting range, e.g. Z m At 850ppm to 1200ppm, the CO detected in the current period is known 2 The concentration value is larger than a preset value Z 0 Ki is now Z-dependent m Is increased by an increase in (a);
when Z is m Beyond a certain value, for example greater than 1200ppm or less than 600ppm, the CO detected in the current cycle is known 2 The concentration is far above or far below the preset value Z 0 Where ki is a constant value greater than 0 (e.g., where Z m >At 1200, ki=1; f (f) m <-600, ki=0.5), i.e. ki is not dependent on Z m The change in turn affects the air delivery gear.
As shown in fig. 6, the correction amount kd is about the third difference g m Variable, third difference g m A second difference f obtained for the current period m A second difference f from the previous cycle m-1 The difference between them, g m ＝f m -f m-1 . In the form of CO 2 The concentration is as follows:
if the third difference g obtained in the current period m Within a first setting range, e.g. g m At-2 ppm to 2ppm, the CO detected in three adjacent cycles is known 2 The difference between the concentration values is small, i.e. CO 2 The concentration is in a stable numerical range, kd is 0 at the moment, and the change of the air supply gear is not influenced;
if g m Within a second setting range, e.g. g m At-10 ppm to-2 ppm, the current two cycles of CO are known 2 CO with concentration variation less than the last two periods 2 Concentration variation, g m The smaller the CO 2 The faster the concentration decreases, the kd with g m Is increased with the decrease of g, and the air supply gear is also increased with g m Is reduced by the reduction of (2);
if g m Within a third setting range, e.g. g m At 2ppm to 10ppm, the CO of the two previous cycles is known 2 CO with concentration variation value greater than last two periods 2 Concentration variation, g m The larger the CO 2 The faster the concentration rises, the kd with g m Is increased with the increase of g, and the corresponding air supply gear is also increased with g m Is increased by an increase in (a);
when g m When the absolute value of (C) exceeds a certain value, for example, more than 10ppm or less than-10 ppm, it is known that CO 2 The concentration changes sharply, taking into account the noise of the operation of the indoor air supply unitkd is a constant value greater than 0 (e.g., when g m >Kd=1 at 10; g m <At-10 kd=0.5), i.e. kd is not dependent on g m The change further influences the air supply gear, avoids leading to the abnormal sound because of the air supply gear mutation, and then avoids causing the user to listen uncomfortable.
As can be seen in combination with (2) and figures 3-6,
1) When z1=z2=z3=600, Δfan=0.5×7.5× (-400) = -1500;
2) When z1=z2=700, z3=750, Δfan=1×0.85×50+0.025×7.5× (-150) +1×7.5×50= 389.375;
3) When z1=z2=800, z3=700, Δfan=0.19x7.5× (-100) +0.5x7.5× (-100) = -517.5;
4) When z1=z2=z3=850, Δfan=0;
5) When z1=z2=z3=1200, Δfan= (0.0029×1200-2.43) ×7.5×800=6300.
Compared with the formula (1), the formula (2) can comprehensively calculate Δfan according to the detected values, the first difference, the second difference and the degree of change of the second difference (i.e. the third difference) in different periods, so as to realize: when the detection value is smaller than the preset value, the new wind introduction amount is reduced along with the reduction of the detection value; when the detection value fluctuates near the preset value, the fresh air introduction amount is kept unchanged, and the detection value is allowed to reasonably fluctuate; when the detection value is larger than the preset value, the fresh air introduction amount rises along with the increase of the detection value, so that the regulation and control of the fresh air introduction amount are more accurate and intelligent, the energy conservation of a fresh air system is improved, and the use cost of a user is reduced.
Those skilled in the art can adjust the value ranges of S, si and correction amount kp, n, ki, kd in expression (2) as necessary.
As can be seen from fig. 2, step S401 is further included between steps S4 and S5 of the present invention: and if the first difference values obtained in the first set time period t1 are smaller than the set value L, the indoor air supply unit is closed. Wherein the first set time period t1 is greater than the period S. Compared to the opening condition of the indoor air supply unit (the first difference obtained in the current period is greater than the set value L), the closing condition of the indoor air supply unit set in step S401 takes more first differences into consideration, and the condition needs to be satisfied to close the indoor air supply unit: the first difference values obtained in the first set time period t1 are smaller than the set value L, so that the phenomenon that the indoor air supply unit is repeatedly opened and closed due to the up-and-down fluctuation of the detection value can be effectively reduced, the comfort of a user is improved, and the service life of a fresh air system is prolonged.
Further, step S402 is also included between steps S401 and S5: after the detection unit continuously operates for the second set period t2, the control unit predicts the detection value which can be obtained after the detection unit continuously operates for the third set period t3 according to the detection value which is obtained by the detection unit in the second set period t2, obtains a predicted detection result value, and then calculates a fourth difference value between the predicted detection result value and the detection value obtained in the current period.
If the fourth difference is greater than 0, it means that the current fresh air intake of the indoor air supply unit is insufficient to reduce the detection result in the third set time period t3, and the control unit should increase the fresh air intake of the indoor air supply unit.
If the fourth difference is less than or equal to 0, the step S5 is continued.
For step S402, one application embodiment is: 15 persons enter a room with an area of 100m 2 The detection unit detects CO in the current room 2 At a concentration of 600ppm and predicts CO in the room after 15min 2 A concentration of 1000ppm, since the fourth difference=1000 ppm-600 ppm=400 ppm>0, the control unit increases the fresh air introduction amount of the indoor air supply unit. If step S402 is not performed, the control unit needs to detect the CO in the current room by the detection unit according to formula (1) 2 The fresh air introduction amount of the indoor air supply unit is increased when the concentration is greater than 700ppm, so that the fresh air introduction amount in the third set time period t3 can be increased in advance in step S402, continuous reduction of air quality in the third set time period t3 is avoided, and indoor comfort is improved.
In the control method of the present invention, when the detection unit communicates abnormally, the control unit keeps the fresh air introduction amount of the indoor air supply unit unchanged for a fourth set period t4, and then turns off the indoor air supply unit. The arrangement can ensure that the fresh air system continues to work within a period of time after the communication of the detection unit is abnormal, improve the indoor air quality, and then close in time, so that the use experience of a user is improved, the energy consumption of the fresh air system can be reduced, and the use cost of the user is reduced.
In the control method of the invention, the fresh air system adjusts the fresh air introduction amount according to the indoor air quality detection value. Removing the CO 2 Besides the concentration value, the control unit can also adjust the fresh air introduction amount according to one or more detection values of the PM2.5 concentration value detected by the tiny particle sensor, the formaldehyde concentration value detected by the formaldehyde sensor, the TVOC concentration value detected by the TVOC sensor, the indoor and outdoor temperature difference value detected by the temperature sensor and the indoor and outdoor humidity difference value detected by the humidity sensor, thereby reducing the operation energy consumption of the fresh air system and the use cost of a user while meeting the comfort level of the user body. Further, the fresh air system can also adjust the fresh air introduction amount and the temperature of the introduced fresh air at the same time, so that the comfort level of the user body feeling is further improved, and the energy consumption is saved.
< fresh air temperature Regulation >
Fresh air is introduced into the fresh air device of the fresh air system according to the indoor air quality condition, so that the indoor air quality is ensured, and the comfort level of a user is improved. In spring and autumn, because the temperature difference between the indoor and outdoor is small, the user does not feel uncomfortable when the temperature difference is large, at the moment, the indoor air supply unit of the indoor unit of the fresh air device can introduce fresh air, but a refrigerant loop of the fresh air device does not work, namely, the temperature of the introduced fresh air is not regulated; in summer or winter, because the temperature difference between indoor and outdoor is big, adjust the size of new trend introduction volume and not only can influence the user's feel, also can lead to the fact the influence to the whole energy consumption of new trend system, consequently before the new trend is sent into indoor, need adjust the air supply temperature of new trend device indoor set through adjusting the running state of new trend device. Specifically, the heat exchange amount of the fresh air flowing through the fresh air heat exchange unit can be adjusted by adjusting the circulation amount of the refrigerant in the refrigerant loop of the fresh air device and/or adjusting the flow rate of the refrigerant flowing through the fresh air heat exchange unit.
In the control method of the invention, the indoor unit of the air conditioner receives the set temperature T sent by the control terminal, for example, a user sends an instruction to the indoor unit of the air conditioner through a remote controller or a mobile phone APP, confirms that the set temperature T is 24 ℃, and the control unit adjusts the air supply temperature of the fresh air introduced by the indoor air supply unit according to the set temperature T, preferably, the air supply temperature of the indoor air supply unit is adjusted to be 24 ℃, so that the temperature of the fresh air fed into the room is consistent with the indoor temperature, and the comfort of the user and the energy conservation of a fresh air system are improved.
Considering that the setting position of the temperature sensor, the fresh air volume, the length of the air supply pipeline and the like in the indoor unit of the fresh air device all cause deviation of the air supply temperature, the air supply temperature of the indoor air supply unit can be adjusted to be slightly lower than the set temperature T of the air conditioner, for example, lower than 1 ℃ in the refrigeration state; in the heating state, the air supply temperature of the indoor air supply unit can be adjusted to be slightly higher than the set temperature T of the air conditioner, for example, the temperature is 1 ℃ higher, and the air supply temperature of the indoor air supply unit is ensured to be close to the set temperature T of the air conditioner, so that the user comfort and the energy conservation performance of the fresh air system are further improved.
The detecting unit comprises an indoor temperature sensor and an outdoor temperature sensor, the indoor temperature sensor detects an indoor temperature T1, the outdoor temperature sensor detects an outdoor temperature T2, and the control unit adjusts the working state of the fresh air heat exchange unit according to the difference value between the indoor temperature T1 and the outdoor temperature T2 and the set temperature T. In one embodiment of the invention, when |T1-T2| is equal to or less than the set value T 0 When the temperature difference between the indoor temperature and the outdoor temperature is smaller, the indoor temperature fluctuation cannot be caused by introducing fresh air, and the electric valve is closed, namely the temperature of the fresh air is not regulated by a fresh air heat exchange unit of the fresh air device; when |T1-T2| > the set value T 0 At this time, the temperature difference between the indoor and the outdoor is large, and the heat exchange amount of the fresh air heat exchange unit can be adjusted according to the indoor temperature T1 or the set temperature T of the air conditioner. In order to make the fresh air temperature sent into the room by the indoor air supply unit approach the indoor temperature T1 or the set temperature T of the air conditioner, the set value T is set 0 The larger the heat exchange degree of the fresh air heat exchange unit is, at the moment, the flow of the refrigerant flowing through the fresh air heat exchange unit can be increased by adjusting the opening degree of the electric valve, and +.Or the frequency of the compressor is regulated to regulate the circulation quantity of the refrigerant in the refrigerant loop so as to improve the heat exchange quantity of the fresh air device, and then the air supply temperature of the indoor unit of the fresh air device is regulated.
When |T1-T2| exceeds the set value T X Time (set value T) X Is greater than the set value T 0 ) At this time, the outdoor is in an extremely cold or hot state, and in order to ensure the service life of the fresh air device and avoid excessive loss of the fresh air system, the indoor air supply unit of the fresh air device stops running, i.e. fresh air is not introduced.
As shown in fig. 7, the air conditioner of the fresh air system may have a plurality of air conditioner indoor units, each of which may be disposed in a different room or a different indoor area of the room, and each of the air conditioner indoor units has a set temperature, and the control unit adjusts the supply temperature of the fresh air introduced from the indoor air supply unit according to an average value of the set temperatures, so that the supply temperature of the indoor air supply unit may be maximally close to the set temperature of the most air conditioner indoor units, thereby ensuring the comfort of the body feeling of the user in the different room or the different indoor area, and improving the energy saving property of the fresh air system. Here, the average value of the set temperatures of the plurality of air conditioner indoor units is obtained by taking the average value of the set temperatures of the air conditioner indoor units in operation among the plurality of air conditioner indoor units.
The indoor air supply unit can finely adjust the temperature of the fresh air introduced by the fresh air device through linkage control of the fresh air device and the air conditioner, and the energy-saving effect of the fresh air system is realized while the comfort level of the user body is ensured.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (18)
1. The control method of the fresh air system comprises a detection unit, a control unit and a fresh air device, and is characterized in that an indoor air supply unit of the fresh air device comprises a direct current motor, and the method comprises the following steps:
the detecting unit detects the indoor air quality every other period S and obtains a detection value Z m M is a positive integer;
the control unit will detect the value Z m And a preset value Z 0 Comparing and calculating to obtain a detection value Z m And a preset value Z 0 First difference e between m ；
When the first difference e m When the air quantity is larger than a set value L, starting the indoor air supply unit;
after the indoor air supply unit is started, the control unit calculates a first difference e obtained in the current period m A first difference e from the previous cycle m-1 Second difference f between m And according to the second difference f m And regulating the fresh air introduction amount of the indoor air supply unit.
2. The control method according to claim 1, wherein the indoor air supply unit is provided with a plurality of air supply gears, and the higher the air supply gear is, the larger the fresh air introduction amount is; the control unit is used for controlling the first differential value f m And switching the air supply gear of the indoor air supply unit.
3. The control method according to claim 2, wherein when the second difference f m When the air supply speed is larger than 0, the control unit increases the air supply gear of the indoor air supply unit;
when the second difference f m When the air supply speed is equal to 0, the control unit maintains the air supply gear of the indoor air supply unit unchanged;
when the second difference f m And when the air quantity is smaller than 0, the control unit reduces the air supply gear of the indoor air supply unit.
4. The control method according to claim 1, wherein the control unit is configured to control the control unit according to a second difference f m Calculating a fresh air increment, and adjusting the fresh air introduction amount of the indoor air supply unit according to the fresh air increment; fresh air increment deltaThe calculation formula of Fan is:
ΔFan＝n*f m ，
wherein the correction amount n >0.
5. The control method according to claim 4, wherein the control unit adjusts the correction amount based on the detected value, the first difference value, and the second difference value, calculates a fresh air increment Δfan based on the first difference value, the second difference value, and the adjusted correction amount, and then adjusts the fresh air introduction amount of the indoor air supply unit based on the fresh air increment Δfan.
6. The control method according to claim 5, wherein the first difference value, the second difference value, and the adjusted correction amount are substituted into a PID algorithm formula, the PID algorithm formula being:
ΔFan＝kp×n×f m +ki×(S/2×Si)×(e m +e m-1 )+kd×(S/2×Si)×f m
wherein S is a period, si is a given parameter value; kp, n, ki, kd is the correction amount.
7. The control method according to claim 4 or 6, wherein the correction amount n is a first difference e obtained with respect to the current period m Is used for the control of the variable of (a),
when e m When L is less than or equal to, n=0;
when L < e m When less than or equal to 0, n and e m Positive correlation;
when e m >At 0, n=x;
wherein, the setting value L is less than 0, and the setting value X is more than 0.
8. The control method according to claim 1, wherein the indoor air supply unit is turned off if the first difference obtained in the first set period is smaller than the set value L.
9. The control method according to claim 1, characterized by further comprising the step of: after the detection unit continuously operates for a second set period of time, the control unit predicts a detection value which can be obtained after the detection unit continuously operates for a third set period of time according to the detection value obtained by the detection unit in the second set period of time, obtains a predicted detection result value, and then calculates a fourth difference value between the predicted detection result value and the detection value obtained in the current period.
10. The control method according to claim 9, wherein the control unit increases the fresh air introduction amount of the indoor air supply unit when the fourth difference is greater than 0.
11. The control method according to claim 1, wherein when the detection unit is abnormal in communication, the control unit keeps the fresh air introduction amount of the indoor air supply unit unchanged for a fourth set period of time, and then turns off the indoor air supply unit.
12. The control method according to claim 1, wherein the detection unit includes CO 2 One or more of a sensor, a fine particle sensor, a formaldehyde sensor, a TVOC sensor, a temperature sensor, and a humidity sensor.
13. The control method according to claim 1, wherein the fresh air system further comprises an air conditioner, and the control unit adjusts the air supply temperature of the indoor air supply unit according to a set temperature T of the air conditioner.
14. The control method according to claim 13, characterized in that the detection unit includes an indoor temperature sensor that detects an indoor temperature T1 and an outdoor temperature sensor that detects an outdoor temperature T2; the control unit adjusts the running state of the fresh air device according to the difference value between the indoor temperature T1 and the outdoor temperature T2 and the set temperature T.
15. The control method according to claim 14, wherein the fresh air device further comprises a fresh air heat exchange unit and an electric valve connected to the fresh air heat exchange unit, when |t1-t2|is smaller than or equal to a set value T 0 When the electric valve is closed; when |T1-T2| > the set value T 0 When the control unit opens the electric valve.
16. The control method according to claim 14, wherein the fresh air device further includes a compressor, and the control unit adjusts an operation frequency of the compressor according to a difference between the indoor temperature T1 and the outdoor temperature T2 and the set temperature T.
17. The control method according to claim 1, wherein the fresh air system includes a plurality of air conditioners each having a set temperature, and the control unit adjusts the supply air temperature of the indoor air supply unit according to an average value of the plurality of set temperatures.
18. A fresh air system, characterized in that it is controlled by a control method according to any one of claims 1-17.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202672.5A CN116734365A (en) | 2022-03-02 | 2022-03-02 | Fresh air system and control method thereof |
| PCT/JP2023/007442 WO2023167209A1 (en) | 2022-03-02 | 2023-02-28 | Fresh air system and method for controlling same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202672.5A CN116734365A (en) | 2022-03-02 | 2022-03-02 | Fresh air system and control method thereof |
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| Publication Number | Publication Date |
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| CN116734365A true CN116734365A (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210202672.5A Pending CN116734365A (en) | 2022-03-02 | 2022-03-02 | Fresh air system and control method thereof |
Country Status (2)
| Country | Link |
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| CN (1) | CN116734365A (en) |
| WO (1) | WO2023167209A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886501A (en) * | 1994-09-19 | 1996-04-02 | Toshiba Corp | Air-conditioning machine |
| JP4850269B2 (en) * | 2009-04-07 | 2012-01-11 | 三菱電機株式会社 | Air conditioning system and remote monitoring device |
| CN107631425B (en) * | 2017-09-04 | 2020-04-24 | 青岛海尔空调器有限总公司 | Method and device for double control of temperature and humidity of air conditioner |
| WO2020195338A1 (en) * | 2019-03-26 | 2020-10-01 | パナソニックＩｐマネジメント株式会社 | Air conditioning system controller |
| US11674709B2 (en) * | 2020-03-19 | 2023-06-13 | Fh Alliance Inc. | Air conditioning system |
-
2022
- 2022-03-02 CN CN202210202672.5A patent/CN116734365A/en active Pending
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- 2023-02-28 WO PCT/JP2023/007442 patent/WO2023167209A1/en unknown
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| WO2023167209A1 (en) | 2023-09-07 |
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