CN114508824B - Fresh air system - Google Patents
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- CN114508824B CN114508824B CN202210203686.9A CN202210203686A CN114508824B CN 114508824 B CN114508824 B CN 114508824B CN 202210203686 A CN202210203686 A CN 202210203686A CN 114508824 B CN114508824 B CN 114508824B
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- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims description 13
- 238000009423 ventilation Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 206010041349 Somnolence Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- F24F11/0001—Control or safety arrangements for ventilation
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- F24F11/0001—Control or safety arrangements for ventilation
- F24F2011/0002—Control or safety arrangements for ventilation for admittance of 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
- F24F2110/52—Air quality properties 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
- F24F2110/64—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
- F24F2110/70—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
- F24F2120/00—Control inputs relating to users or occupants
- F24F2120/10—Occupancy
- F24F2120/14—Activity of occupants
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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)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a fresh air system, which comprises: a fresh air unit; a first detection unit; a second detection unit; a person detection unit; a calculation unit for CO in the room when the PM2.5 concentration in the outdoor environment is lower than the PM2.5 concentration limit value 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, calculating the fresh air volume V 1 The method comprises the steps of carrying out a first treatment on the surface of the In-house CO 2 Calculating the fresh air quantity V when the concentration is larger than the second limit; a control unit for CO in a room 2 When the concentration is smaller than or equal to the first limit value, controlling the fresh air handling unit to operate by taking the preset air quantity as a target air quantity; in-house CO 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, the fresh air handling unit is controlled to be in fresh air volume V 1 The air quantity is the target air quantity; in-house CO 2 And when the concentration is greater than the second limit value, controlling the fresh air handling unit to operate by taking the fresh air volume V as the target air volume. The invention intelligently adjusts the fresh air quantity of the fresh air handling unit.
Description
Technical Field
The invention relates to the technical field of fresh air control, in particular to a fresh air system.
Background
The fresh air unit is an efficient and energy-saving heat recovery device, and when the fresh air unit works, indoor exhaust air and outdoor fresh air respectively flow through the total heat exchange core body in a positive crossing mode, the two airflows present heat and mass transfer phenomena when passing through the partition plate due to the temperature difference and the steam partial pressure difference of airflows at two sides of the airflow partition plate, so that the total heat exchange process is caused.
For densely populated places such as shops and school classrooms, when the carbon dioxide concentration exceeds the standard (> 1000 ppm), people feel drowsy and are hard to concentrate, so that the fresh air quantity demand is extremely high, and the fresh air load is also extremely high. However, the people density in these places is continuously changed, such as a market, the workday is relatively less people, the weekend is more people, but the fresh air quantity is generally designed according to the larger people quantity.
Under the condition, if the fresh air quantity cannot be accurately regulated, great waste of energy is caused, so that how to ensure the fresh air quantity demand in a place and save energy to the maximum extent is a concern of a fresh air conditioner.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fresh air system which can intelligently adjust the fresh air quantity of a fresh air unit, and can save energy while meeting the fresh air quantity requirement of a user.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
the application provides a new trend system, its characterized in that includes:
a fresh air unit;
a first detection unit for detecting at least CO of the indoor environment in real time 2 Concentration;
a second detection unit for detecting CO of the outdoor environment in real time 2 Concentration and PM2.5 concentration;
a person detection unit for detecting the number of persons in the indoor environment in real time;
a calculation unit for CO in the room when the PM2.5 concentration in the outdoor environment is lower than the PM2.5 concentration limit value 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, calculating the fresh air volume V of the fresh air unit according to the formula (1) 1 The method comprises the steps of carrying out a first treatment on the surface of the In-house CO 2 When the concentration is greater than the second limit value, respectively calculating the fresh air volume V according to the formula (2) and the formula (3) 2 And V 3 And taking the larger value of the two as the fresh air volume V;
a control unit for CO in a room 2 When the concentration is smaller than or equal to a first limit value, controlling the fresh air handling unit to operate by taking the preset air quantity as a target air quantity; in-house CO 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, the fresh air unit is controlled to be in fresh air volume V 1 The air quantity is the target air quantity; in-house CO 2 When the concentration is larger than the second limit value, controlling the fresh air handling unit to operate by taking the fresh air volume V as a target air volume;
wherein,,
（1）；/>
（2）；/>
（3）；
p-number of people in room, x 0 Expired CO per person 2 Constant, K 1 And K 2 Is constant and K 1 ＜K 2 ，y in -preset indoor CO 2 Concentration, y out Outdoor CO 2 Concentration, S-room area, H-room floor height, n-ventilation times.
In some embodiments of the present application, the fresh air system further comprises:
a storage unit for storing indoor design CO 2 Concentration limit value table, indoor design CO 2 The concentration limit value table at least comprises oneGrade CO 2 Concentration limits and/or secondary CO 2 Concentration limit;
the preset indoor CO 2 Concentration from the indoor design CO 2 And selecting from a concentration limit value table.
In some embodiments of the present application, the CO is designed within the chamber 2 The concentration limit value table comprises first-order CO 2 Concentration limit and secondary CO 2 At the concentration limit, the first-order CO 2 Concentration limit is smaller than the secondary CO 2 Concentration limit.
In some embodiments of the present application, the K 1 Is 0 to 30 (m) 3 /h), and said K 2 50 to 100 (m) 3 /h); and/or
And n is 2-10 times.
In some embodiments of the present application, the fresh air handling unit includes an outdoor fresh air vent;
the second detection unit is arranged at the outdoor fresh air port.
In some embodiments of the present application, the fresh air system further comprises:
an air conditioner indoor unit for adjusting an indoor air temperature.
In some embodiments of the present application, the person detection unit is an infrared sensor;
the number of the infrared sensors is at least one, and the infrared sensors are distributed in the range of the activity area of the indoor person.
In some embodiments of the present application, the fresh air system further comprises:
an anemometer for detecting an airflow velocity of an active area of an indoor person.
Compared with the prior art, the fresh air system that this application provided has following advantage and beneficial effect:
CO according to the detected indoor environment 2 Concentration at CO 2 When the concentration is lower than the first limit value, the indoor CO is represented 2 The concentration is low, and the fresh air unit runs with the preset air quantity as the target air quantity for the purpose of energy saving at the moment, and is arranged at the CO 2 When the concentration is higher than the first limit value and lower than the second limit value, the method is according to the publicThe formula (1) obtains the target air quantity, adjusts the fresh air quantity demand of indoor personnel, improves the indoor air quality, reduces the energy consumption of a fresh air unit and reduces the energy consumption of a fresh air unit at the same time, and reduces the energy consumption of the fresh air unit at the same time when the fresh air unit is used for cooling CO 2 When the concentration is greater than the second limit value, the indoor CO is represented 2 The concentration is high, the fresh air unit selects the calculated large air volume V as the target air volume to run, and the indoor CO is quickly reduced 2 Concentration improves indoor air quality, improves user's travelling comfort, consequently, the new trend system that this application provided can intelligent regulation fresh air volume, when satisfying user's fresh air volume demand, realizes that the unit is energy-conserving.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an embodiment of a fresh air system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Basic operation principle of air conditioner
The air conditioner performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
The air conditioner outdoor unit refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the air conditioner indoor unit includes an indoor heat exchanger, and an expansion valve may be provided in the air conditioner indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
[ fresh air System ]
The fresh air system in this application includes fresh air unit, air condensing units and air conditioning indoor set.
The air conditioner indoor unit and the air conditioner outdoor unit form an air conditioner that performs the indoor temperature adjusting function as described above.
Fresh air unit
The fresh air handling unit comprises an air outlet EA, an air exhauster (not shown), a casing (not shown), a total heat exchange core (not shown), an air return RA, a fresh air outlet OA, an air supply SA and an air feeder (not shown).
The shell is provided with an air outlet EA, an air return port RA, an air supply port SA and a fresh air port OA, the air outlet EA is provided with an exhaust fan, and the air supply port SA is provided with an air feeder; the total heat exchange core body is arranged inside the shell, and the space in the shell is divided into four channels which are communicated with the total heat exchange core body.
The four channels comprise a fresh air channel, an air supply channel, a return air channel and an exhaust channel.
The fresh air channel is a passage from the fresh air port OA to one side of the total heat exchange core body.
The air supply channel is a passage from one side of the total heat exchange core body to the air supply port SA.
The return air channel is a passage from the return air inlet RA to one side of the total heat exchange core body.
The exhaust channel is a passage from one side of the total heat exchange core body to the exhaust outlet EA.
When the fresh air unit works, fresh air is only supplied to indoor air, and the purpose of indoor air quality adjustment is achieved.
When the fresh air unit and the air conditioner indoor unit work, the return air from the return air port RA and the fresh air from the fresh air port OA exchange heat through the total heat exchange core body.
When the air conditioner operates in a refrigerating period in summer, fresh air obtains cold energy from return air, so that the temperature is reduced, and the fresh air is dried, so that the humidity of the fresh air is reduced; when the air conditioner operates in a heating period in winter, fresh air obtains heat from return air, so that the temperature is increased, and meanwhile, the fresh air is humidified by the return air, so that the humidity of the fresh air is increased.
Fresh air system
Referring to FIG. 1, a functional block diagram of a fresh air system is shown.
The fresh air system includes, in addition to the fresh air handling unit 10 as described above, a first detection unit 20, a second detection unit 30, a person detection unit 40, a calculation unit 50, and a control unit 60.
The first detection unit 20 is at least used for detecting CO in the indoor environment in real time 2 Of course, the concentration of PM2.5 in the indoor environment may be detected in real time.
The second detecting unit 30 is used for detecting the CO of the outdoor environment in real time 2 Concentration and PM2.5 concentration.
As described above, the fresh air handling unit 10 includes the fresh air port OA, and the second detecting unit 30 is disposed at the fresh air port OA.
The concentration of PM2.5 in the outdoor environment is used for measuring the quality of the outdoor air, and the concentration limit value of PM2.5 can be set.
When the detected PM2.5 concentration in the outdoor environment is less than or equal to the PM2.5 concentration limit value, the outdoor air quality is better, and the fresh air unit 10 is suitable for introducing outdoor fresh air, and can operate at the moment; when the detected concentration of PM2.5 in the outdoor environment is greater than the concentration limit value of PM2.5, it indicates that the outdoor air quality is poor, and the outdoor fresh air is not suitable to be introduced, and at this time, the fresh air handling unit 10 does not operate.
Therefore, the precondition for the operation of the fresh air handling unit 10 is: the detected outdoor environment PM2.5 concentration is equal to or less than the PM2.5 concentration limit.
The person detecting unit 40 is used for detecting the number of persons in the room, and if the number of persons is different, the exhaled CO is obtained 2 Different concentrations, thereby affecting CO in indoor environments 2 Concentration.
The person detecting unit 40 may employ an infrared sensor.
The infrared sensor is provided with one or more infrared sensors which are distributed in the range of the moving area of indoor people, so that the detection area can be enlarged, and the detected number of people is more accurate.
The calculating unit 50 is used for calculating the target air volume of the fresh air handling unit 10 to meet the requirement of the user for fresh air volume (i.e. to avoid CO 2 The concentration is too high to cause drowsiness, concentration is not concentrated, and the like), the energy saving of the fresh air handling unit 10 is realized.
When the fresh air handling unit 10 is not operating (i.e., the PM2.5 of the outdoor environment is greater than the PM2.5 concentration limit), the target air volume is not calculated, and only when the fresh air handling unit 10 is operating, the target air volume is calculated.
Indoor CO
2
Low concentration
In-house CO (detected by the first detection unit 20) 2 And when the concentration is smaller than or equal to the first limit value, the target air quantity is the preset air quantity.
The first limit is a preset value, for example, the first limit may be 200PPM.
The preset air volume is also a preset value, which is the lowest air volume when the fresh air handling unit 10 operates.
The preset air volume is used as the target air volume for the operation of the fresh air handling unit 10 at this stage.
Indoor CO 2 The concentration is less than or equal to a first limit value, representing indoor CO 2 The concentration is low, the fresh air unit 10 is operated with the target air quantity, the energy consumption is reduced, the energy saving is realized, and meanwhile, the indoor CO can be ensured 2 The concentration does not affect the user (i.e., meets the user's fresh air demand).
Indoor CO
2
The concentration is lower
In (firstCO in the room detected by the detection unit 20) 2 When the concentration is greater than the first limit value and less than or equal to the second limit value, the indoor CO is represented 2 The concentration is low, and therefore, the calculation unit 50 calculates the fresh air volume V according to the formula (1) 1 。
The second limit value is a preset value which is larger than the first limit value; for example, the second limit may be 500PPM.
Where P represents the number of persons in the room, detected by the person detecting unit 40.
x 0 CO exhaled by each person 2 Constant, let x in this application 0 =18l (human h) =0.018 m 3 (person h); k (K) 1 Can be constant and can take a value of 0 to 30 (m 3 /h）。
y in Representing CO in a preset room 2 Concentration, which is preset; y is out Representing outdoor CO 2 The concentration, which is detected by the second detection unit 30.
Wherein preset indoor CO 2 The concentration may be indoor design CO stored in a storage unit (not shown) 2 Values in the concentration limit table.
Indoor design CO 2 The concentration limit value table is indoor design CO 2 The value required for the concentration may include a value required for the concentration of PM2.5 in the indoor design, as shown in the following table.
The data A, A ', B and B' in the above table are empirical values obtained from experiments, where A < A ', B < B'.
The data can be considered as the concentration of PM2.5 and CO in the industry 2 The required limit of the concentration can be, for example, 35. Mu.g/m 3 Representing the mass of PM2.5 per unit volume, this value is typically measured in one hourMean of the mass of PM2.5 measured.
Preset indoor CO 2 Concentration y in Can be selected from the above table, and can select one-level CO according to user requirements 2 Concentration limit (i.e., B%) or secondary CO 2 Concentration limit (i.e., B'%).
Assume that room area s=15m 2 The method comprises the steps of carrying out a first treatment on the surface of the Room layer height h=3m; p=2; x is x 0 =0.018m 3 (person h); y is in Take the value B%, e.g. y in =0.15%；y out =0.05%，K 1 =20（m 3 /h), then according to formula (1):
V 1 =0.1*（2*0.018/（0.15%-0.05%））（m 3 /h）+20（m 3 /h）=23.6（m 3 /h）。
if the air quantity is calculated simply according to the number of people, the fresh air quantity required by each person is 30 (m 3 /h), the fresh air quantity required by two people is 30 m 3 /h*2=60 m 3 /h。
60 m 3 /h＞23.6 m 3 In the room, CO can be seen 2 When the concentration is smaller, fresh air unit 10 calculates fresh air volume V according to formula (1) 1 And the operation can realize energy conservation.
It should be noted that 30. 30 m 3 And/h is a design experience value which is frequently used according to national standard design requirements.
In-house CO 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, the fresh air volume V is increased 1 As the target air volume for the operation of the fresh air handling unit 10 at this stage.
Indoor CO
2
Higher concentration
In-house CO (detected by the first detection unit 20) 2 When the concentration is greater than the second limit value, the indoor CO is represented 2 The concentration is high, so the calculation unit calculates the fresh air volume V according to the formula (2) 2 And calculating the fresh air volume V according to the formula (3) 3 。
Thereafter, by comparing the fresh air volume V 2 And fresh air volume V 3 Is of the size of (1)The larger value of (b) is taken as the fresh air volume V, namely, if V 2 ≥V 3 Then v=v 2 The method comprises the steps of carrying out a first treatment on the surface of the If V 2 ≤V 3 New, then v=v 3 。
As described above, the second limit is a preset value, for example, the second limit may be 500PPM.
Calculating the fresh air volume V according to the formula (2) 2 The way of (2) is as follows:
wherein, S-room area, H-room layer height, n-ventilation times.
Note that the ventilation times n may be selected to be 2 to 10 times.
For example, room area s=15m 2 The method comprises the steps of carrying out a first treatment on the surface of the Room layer height h=3m; ventilation times n=5 times, V 2 The method comprises the following steps:
V 2 =15*3*5（m 3 /h）=225（m 3 /h）。
calculating the fresh air volume V according to the formula (3) 3 The way of (2) is as follows:
wherein P represents the number of people in the room, and is detected by the people detection unit.
x 0 CO exhaled by each person 2 Constant, let x in this application 0 =18l (human h) =0.018 m 3 (person h); k (K) 2 Is a constant, and has a value greater than K 1 Can take a value of 50 to 100 (m 3 /h）。
y in Representing CO in a preset room 2 Concentration, which is preset; y is out Representing outdoor CO 2 Concentration, which is detected by the second detection unit.
Similarly, as described above, indoor CO is preset 2 The concentration can be controlled by indoor design CO 2 Concentration limit table selection。
Assume that room area s=15m 2 The method comprises the steps of carrying out a first treatment on the surface of the Room layer height h=3m; p=2; x is x 0 =0.018m 3 (person h); y is in =0.15%；y out =0.05%，K 2 =100（m 3 /h), then according to formula (3):
V 3 =0.1*（2*0.018/（0.15%-0.05%））（m 3 /h）+100（m 3 /h）=103.6（m 3 /h）。
by comparison of V 2 ≥V 3 New air volume v=v 2 。
If calculated and compared, V is obtained 2 ≤V 3 New air volume v=v 3 。
The fresh air handling unit 10 operates with fresh air volume V as target air volume, namely selects larger fresh air volume as target air volume to operate, thereby realizing rapid reduction of indoor CO 2 Concentration, priority guarantees user experience.
During operation of the fresh air unit 10, the control unit 60 may set the CO in the room at intervals (e.g., 15 minutes) 2 Concentration, outdoor CO 2 The concentration and the outdoor PM2.5 concentration were detected.
Based on the comparison between the outdoor PM2.5 and PM2.5 concentration limits, it is determined whether the fresh air handling unit 10 is operating, i.e., the fresh air handling unit 10 is not operating when the outdoor PM2.5 is above the PM2.5 concentration limit, and the fresh air handling unit 10 is operating when the outdoor PM2.5 is below the PM2.5 concentration limit.
In the case of operation of the fresh air handling unit 10, according to indoor CO 2 The concentration determines the target air volume of the operation of the fresh air handling unit 10.
In-house CO 2 When the concentration is greater than the second limit value, the fresh air volume V is used as the target air volume for the operation of the fresh air handling unit 10 at this stage.
It should be noted that, the control unit in this application mainly includes ARM chip and peripheral circuit, and the ARM chip can adopt LM3S8970, controls fresh air handling unit.
The fresh air system that this application provided can be according to indoor CO 2 The concentration, the fresh air quantity needed by the fresh air unit 10 is obtained, and the requirement of users is metThe fresh air is required, energy conservation can be realized, and the energy consumption of the fresh air handling unit 10 is reduced.
In addition, the fresh air handling unit 10 further includes an anemometer (not shown) for detecting an air flow rate of an indoor person's active area, through which an actual air volume in the room can be obtained.
After the actual air volume and the target air volume are obtained, the control unit controls the operation of the fresh air handling unit 10 so that the actual air volume is adjusted with the target air volume as a target.
The anemometer has a plurality of probes which respectively detect the air flow speeds at multiple points in the active area, and the actual air quantity is obtained by calculating the average value of the air flow speeds at the multiple points, so that the accuracy is high.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. A fresh air system, comprising:
a fresh air unit;
a first detection unit for detecting at least CO of the indoor environment in real time 2 Concentration;
a second detection unit for detecting CO of the outdoor environment in real time 2 Concentration and PM2.5 concentration;
a person detection unit for detecting the number of persons in the indoor environment in real time;
a calculation unit for CO in the room when the PM2.5 concentration in the outdoor environment is lower than the PM2.5 concentration limit value 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, calculating the fresh air volume V of the fresh air unit according to the formula (1) 1 The method comprises the steps of carrying out a first treatment on the surface of the In-house CO 2 When the concentration is greater than the second limit value, the rootRespectively calculating the fresh air volume V according to the formula (2) and the formula (3) 2 And V 3 And taking the larger value of the two as the fresh air volume V;
a control unit for CO in a room 2 When the concentration is smaller than or equal to the first limit value, controlling the fresh air unit to operate by taking the lowest air quantity when the fresh air unit operates as a target air quantity; in-house CO 2 When the concentration is larger than the first limit value and smaller than or equal to the second limit value, the fresh air handling unit is controlled to be in fresh air volume V 1 The air quantity is the target air quantity; in-house CO 2 When the concentration is larger than the second limit value, controlling the fresh air handling unit to operate by taking the fresh air volume V as a target air volume;
wherein,,
（1）；/>
（2）；/>
（3）；
p-number of people in room, x 0 Expired CO per person 2 Constant, K 1 And K 2 Is constant and K 1 ＜K 2 ，y in -preset indoor CO 2 Concentration, y out Outdoor CO 2 Concentration, S-room area, H-room floor height, n-ventilation times.
2. The fresh air system of claim 1, further comprising:
a storage unit for storing indoor design CO 2 Concentration limit value table, indoor design CO 2 The concentration limit value table at least comprises a first-level CO 2 Concentration limits and/or secondary CO 2 Concentration limit;
the preset indoor CO 2 Concentration from the indoor design CO 2 And selecting from a concentration limit value table.
3. The fresh air system of claim 2, wherein the fresh air system comprises a fresh air system,
CO is designed in the room 2 The concentration limit value table comprises first-order CO 2 Concentration limit and secondary CO 2 At the concentration limit, the first-order CO 2 Concentration limit is smaller than the secondary CO 2 Concentration limit.
4. The fresh air system of claim 1, wherein the fresh air system comprises a fresh air system,
the K is 1 Is 0 to 30 (m) 3 /h), and said K 2 50 to 100 (m) 3 /h); and/or
And n is 2-10 times.
5. The fresh air system according to claim 1 to 4, wherein,
the fresh air unit comprises an outdoor fresh air port;
the second detection unit is arranged at the outdoor fresh air port.
6. The fresh air system of claim 1, further comprising:
an air conditioner indoor unit for adjusting an indoor air temperature.
7. The fresh air system of claim 1, wherein the fresh air system comprises a fresh air system,
the personnel detection unit is an infrared sensor;
the number of the infrared sensors is at least one, and the infrared sensors are distributed in the range of the activity area of the indoor person.
8. The fresh air system of claim 1, further comprising:
an anemometer for detecting an airflow velocity of an active area of an indoor person.
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