CN114508824A - Fresh air system - Google Patents

Fresh air system Download PDF

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Publication number
CN114508824A
CN114508824A CN202210203686.9A CN202210203686A CN114508824A CN 114508824 A CN114508824 A CN 114508824A CN 202210203686 A CN202210203686 A CN 202210203686A CN 114508824 A CN114508824 A CN 114508824A
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Prior art keywords
fresh air
concentration
indoor
unit
air volume
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Granted
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CN202210203686.9A
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Chinese (zh)
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CN114508824B (en
Inventor
都学敏
朱海滨
刘建
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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, comprising: a fresh air handling unit; a first detection unit; a second detection unit; a person detection unit; a computing unit having a PM2.5 concentration in an outdoor environment lower thanPM2.5 concentration limit for indoor CO2When the concentration is greater than the first limit value and less than or equal to the second limit value, calculating the fresh air volume V1(ii) a Indoor CO2When the concentration is greater than the second limit, calculating the fresh air volume V; control unit of indoor CO2When the concentration is less than or equal to a first limit value, controlling the fresh air unit to operate by taking the preset air volume as a target air volume; indoor CO2When the concentration is greater than the first limit value and less than or equal to the second limit value, the fresh air unit is controlled to supply fresh air volume V1Operating for a target air volume; indoor CO2And when the concentration is greater than the second limit value, controlling the fresh air unit to operate by taking the fresh air volume V as the target air volume. The invention intelligently adjusts the fresh air volume of the fresh air handling unit.

Description

Fresh air system
Technical Field
The invention relates to the technical field of fresh air control, in particular to a fresh air system.
Background
The fresh air handling unit is a high-efficiency energy-saving heat recovery device, when in work, indoor exhaust air and outdoor fresh air respectively flow through the total heat exchange core body in a quadrature mode, because the air flow at the two sides of the airflow division plate has temperature difference and steam partial pressure difference, the two air flows show heat and mass transfer phenomena when passing through the division plate, and the total heat exchange process is caused.
For places with dense population, such as shopping malls and classrooms of schools, when the concentration of carbon dioxide exceeds the standard (more than 1000 ppm), people feel sleepy and are difficult to concentrate, so that the demand for fresh air volume is extremely high, and the fresh air load is also extremely high. However, the density of people in these places is constantly changing, for example, in malls, there are few people on working days and many people on weekends, but the fresh air volume is generally designed according to the larger number of people.
In this case, if the fresh air volume cannot be accurately adjusted, a great waste of energy is caused, and therefore, how to save energy to the maximum extent while ensuring the demand for fresh air volume in a site is a problem of concern for fresh air conditioners.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fresh air system, which realizes intelligent adjustment of fresh air volume of a fresh air unit, meets the fresh air volume requirement of a user and realizes system energy conservation.
In order to realize the purpose of the invention, the invention adopts the following technical scheme to realize:
the application provides a new trend system, its characterized in that includes:
a fresh air handling unit;
a first detection unit for detecting at least CO of an indoor environment in real time2Concentration;
a second detection unit for detecting CO of outdoor environment in real time2Concentration 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 indoor CO when the PM2.5 concentration of the outdoor environment is below the PM2.5 concentration limit2When the concentration is greater than the first limit value and less than or equal to a second limit value, calculating the fresh air volume V of the fresh air handling unit according to a formula (1)1(ii) a Indoor CO2When the concentration is greater than the second limit value, respectively calculating the fresh air volume V according to a formula (2) and a formula (3)2And V3And taking the larger value of the two as the fresh air volume V;
control unit of indoor CO2When the concentration is less than or equal to a first limit value, controlling the fresh air handling unit to operate by taking preset air volume as target air volume; indoor CO2When the concentration is greater than the first limit value and less than or equal to a second limit value, controlling the fresh air unit to supply fresh air volume V1Operating for a target air volume; indoor CO2When the concentration is greater than the second limit value, controlling the fresh air unit to operate by taking the fresh air volume V as a target air volume;
wherein the content of the first and second substances,
Figure 100002_DEST_PATH_IMAGE001
（1）；
Figure 15928DEST_PATH_IMAGE002
（2）；
Figure 100002_DEST_PATH_IMAGE003
（3）；
p-number of people in room, x0-exhaled CO per person2Constant, K1And K2Is constant and K1＜K2，yinPreset indoor CO2Concentration, yout-outdoor CO2Concentration, 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 storing the in-house design CO2Concentration limit table, indoor design CO2The concentration limit table comprises at least one stage of CO2Concentration limit and/or secondary CO2A concentration limit;
the preset indoor CO2Concentration design of CO from the Chamber2And selecting from a concentration limit table.
In some embodiments of the present application, designing the CO within the chamber2The concentration limit table includes a first level CO2Concentration limit and secondary CO2At the limit of concentration, the first stage CO2Concentration limit less than the secondary CO2Concentration limit.
In some embodiments of the present application, the K10 to 30 (m)3H), and said K2Is 50 to 100 (m)3H); and/or
And n is 2-10 times.
In some embodiments of the present application, the fresh air handling unit comprises an outdoor fresh air opening;
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:
and the air conditioner indoor unit is used for adjusting the indoor air temperature.
In some embodiments of the present application, the people 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 people in a room.
In some embodiments herein, the fresh air system further comprises:
an anemometer for detecting an air flow velocity of an indoor human activity area.
Compared with the prior art, the new trend system that this application provided has following advantage and beneficial effect:
CO according to detected indoor environment2Concentration in CO2When the concentration is lower than the first limit value, it represents indoor CO2The concentration is low, at the moment, the fresh air unit operates by taking the preset air volume as the target air volume for the purpose of energy conservation, and CO is generated2When the concentration is higher than the first limit value and lower than the second limit value, the target air volume is obtained according to the formula (1), the fresh air volume demand of indoor personnel is adjusted, the indoor air quality is improved, meanwhile, the energy consumption of a fresh air unit is reduced, and CO is measured2When the concentration is higher than the second limit value, the indoor CO is represented2The concentration is high, the fresh air unit selects the calculated large air volume V as the target air volume to operate, and the indoor CO is quickly reduced2Concentration improves the indoor air quality, improves user's travelling comfort, consequently, the new trend system that this application provided can intelligent adjustment 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 more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an embodiment of a fresh air system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, it is to 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 those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the 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 "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
[ basic operation principle of air conditioner ]
The air conditioner performs a refrigeration 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 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 can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of an air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of an air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of an air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
[ fresh air System ]
The new trend system in this application includes machine in new trend unit, air condensing units and the air conditioning.
The indoor air conditioner and the outdoor air conditioner form an air conditioner that performs the indoor temperature adjusting function as described above.
Fresh air handling unit
The fresh air handling unit includes an air outlet EA, an air blower (not shown), a housing (not shown), a total heat exchanging core (not shown), a return air inlet RA, a fresh air inlet OA, an air supply outlet SA, and a blower (not shown).
An air outlet EA, an air return inlet RA, an air supply inlet SA and a fresh air inlet OA are arranged on the shell, an exhaust fan is arranged on the air outlet EA, and an air feeder is arranged on the air supply inlet SA; the total heat exchange core body is arranged inside the casing, and the space in the casing 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, an air return channel and an air exhaust channel.
The fresh air channel is a passage from the fresh air inlet OA to one side of the total heat exchange core.
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.
The air exhaust channel is a passage from one side of the total heat exchange core body to the air exhaust opening EA.
When only the fresh air unit works, only fresh air is supplied to indoor air, and the purpose of indoor air quality adjustment is achieved.
When the fresh air unit and the indoor unit of the air conditioner work, return air from the return air inlet RA and fresh air from the fresh air inlet OA are subjected to heat exchange through the total heat exchange core.
When the air conditioner operates in a refrigerating period in summer, the fresh air obtains cold energy from return air, so that the temperature is reduced, and meanwhile, the fresh air is dried by the fresh air, so that the humidity of the fresh air is reduced; when the air conditioner runs in a winter heating period, the fresh air obtains heat from the return air, so that the temperature is raised, 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 schematic block diagram of a fresh air system is shown.
The fresh air system includes the fresh air handling unit 10 as described above, and further includes a first detecting unit 20, a second detecting unit 30, a person detecting unit 40, a calculating unit 50, and a control unit 60.
The first detection unit 20 is at least used for detecting CO of the indoor environment in real time2Of course, the concentration of PM2.5 in the indoor environment may be detected in real time.
The second detection unit 30 is used for detecting CO of outdoor environment in real time2Concentration and PM2.5 concentration.
As described above, the fresh air handling unit 10 includes the fresh air opening OA, and the second detection unit 30 is disposed at the fresh air opening OA.
The PM2.5 concentration in the outdoor environment is used for measuring the quality of outdoor air, and a PM2.5 concentration limit value can be set.
When the detected concentration of the PM2.5 in the outdoor environment is less than or equal to the PM2.5 concentration limit value, the outdoor air quality is excellent, the outdoor fresh air is suitable to be introduced, and at the moment, the fresh air unit 10 can operate; when the detected concentration of the outdoor environment PM2.5 is greater than the PM2.5 concentration limit value, the quality of outdoor air is poor, outdoor fresh air is not suitable to be introduced, and at the moment, the fresh air unit 10 does not work.
Therefore, the working preconditions of the fresh air handling unit 10 are: the detected PM2.5 concentration of the outdoor environment is less than or equal to the PM2.5 concentration limit value.
The personnel detection unit 40 is used for detecting the number of indoor personnel, and the exhaled CO is generated when the number of the personnel is different2Different concentrations of CO, thereby affecting the indoor environment2And (4) concentration.
The person detection unit 40 may employ an infrared sensor.
One or more infrared sensors are arranged and distributed in the range of the moving area of indoor people, so that the detection area can be enlarged, and the number result of detected people is more accurate.
The calculating unit 50 is used for calculating the target air volume of the fresh air handling unit 10, and meeting the requirement of the user on the fresh air volume (i.e. avoiding CO)2Drowsiness, inattention, etc. caused by too high concentration) and simultaneously realizes the energy saving of the fresh air handling unit 10.
When the fresh air handling unit 10 is not operating (i.e., PM2.5 in 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 The concentration is lower
In-room CO (detected by the first detection unit 20)2When the concentration is less than or equal to the first limit value, the target air volume is a preset air volume.
The first limit is a predetermined value, for example, the first limit may be 200 PPM.
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 of the operation of the fresh air handling unit 10 at this stage.
Indoor CO2Concentration of the organic compound is less than or equal to a first limit value and represents indoor CO2The concentration is low, the fresh air handling unit 10 is operated at the target air quantity, the energy consumption is reduced, the energy is saved, and meanwhile, the indoor CO can be ensured2The concentration does not affect the user (i.e., the fresh air volume requirement of the user is met).
Indoor CO 2 The concentration is lower
In-room CO (detected by the first detection unit 20)2When the concentration is greater than the first limit value and less than or equal to the second limit value, it represents indoor CO2The 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 and is greater than the first limit value; for example, the second limit may be 500 PPM.
Figure 302553DEST_PATH_IMAGE001
（1）
Where P represents the number of persons in the room and is detected by the person detection unit 40.
x0Every person exhales CO2Constant, in this application, let x0=18L (man · h) =0.018m3(human h); k1Is constant and can take the value of 0-30 (m)3/h）。
yinIndicating a preset indoor CO2A concentration, which is predetermined; y isoutRepresenting outdoor CO2The concentration, which is detected by the second detection unit 30.
In which the indoor CO is preset2The concentration may be designed CO for indoor storage in a storage unit (not shown)2Values in the concentration limit table.
Indoor design CO2Concentration limit table for indoor design of CO2The desired concentration values may also include those required for a designed indoor PM2.5 concentration, as shown in the table below.
Figure 206793DEST_PATH_IMAGE004
The data A, A ', B, and B' in the above table are empirical values obtained from experiments in which A < A ', B < B'.
This data can be considered as the concentration of PM2.5 and CO in the industry for indoors2The desired limit of concentration, for example, A, may be 35, 35. mu.g/m3Representing the mass of PM2.5 per unit volume, this value is typically measured as the mean of the mass of PM2.5 measured over an hour.
Preset of indoor CO2Concentration yinCan be selected from the above table, and according to the user's requirement, can select primary CO2Concentration limit (i.e., B%) or secondary CO2Concentration limit (i.e., B'%).
Suppose, room area S =15m2(ii) a Room floor height H =3 m; p = 2; x is the number of0=0.018m3(human. h); y isinValues of B%, e.g. yin =0.15%；yout=0.05%，K1=20（m3H), then according to equation (1):
V1=0.1*（2*0.018/（0.15%-0.05%））（m3/h）+20（m3/h）=23.6（m3/h）。
if the calculation is simply carried out according to the number of the people, the required fresh air volume of each person is 30 (m)3H), the fresh air quantity required by the two people is 30 m3/h*2=60 m3/h。
60 m3/h＞23.6 m3H, it can be seen that CO is present indoors2When the concentration is small, the fresh air volume V calculated by the fresh air handling unit 10 according to the formula (1)1Energy saving can be realized by operation.
It should be noted that 30 m3The/h is a design experience value that is often used according to national standard design requirements.
Indoor CO2When the concentration is greater than the first limit value and less than or equal to the second limit value, the fresh air volume V is adjusted1As the target air volume for the operation of the fresh air handling unit 10 at this stage.
Indoor CO 2 Comparison of concentrationHeight of
In-room CO (detected by the first detection unit 20)2When the concentration is higher than the second limit value, the indoor CO is represented2The concentration is high, and therefore, the calculation unit calculates the fresh air volume V according to the formula (2)2And calculating the fresh air volume V according to the formula (3)3。
Thereafter, by comparing the fresh air volume V2Fresh air volume V3Taking the larger value as the fresh air volume V, i.e. if V2≥V3Then V = V2(ii) a If V2≤V3New, then V = V3。
As mentioned above, the second limit is a predetermined value, for example, the second limit may be 500 PPM.
Calculating the fresh air volume V according to the formula (2)2The method of (1) is as follows:
Figure 819040DEST_PATH_IMAGE002
（2）
wherein, the S-room area, the H-room layer height and the n-ventilation times.
The number of ventilation times n may be selected from 2 to 10.
For example, room area S =15m2(ii) a Room floor height H =3 m; the number of ventilation n =5, then V2Comprises the following steps:
V2=15*3*5（m3/h）=225（m3/h）。
calculating the fresh air volume V according to the formula (3)3The method of (1) is as follows:
Figure 700408DEST_PATH_IMAGE003
（3）
wherein, P represents the number of indoor personnel and is detected by the personnel detecting unit.
x0Every person exhales CO2Constant, in this application, let x0=18L (man · h) =0.018m3(human. h); k2Is constant and has large valueAt K1Can take a value of 50-100 (m)3/h）。
yinIndicating a preset indoor CO2A concentration, which is predetermined; y isoutRepresenting outdoor CO2A concentration, which is detected by the second detection unit.
Similarly, as described above, indoor CO is preset2The concentration of CO can be designed from indoor2And selecting from a concentration limit table.
Suppose, room area S =15m2(ii) a The room layer height H =3 m; p = 2; x is the number of0=0.018m3(human. h); y isin=0.15%；yout=0.05%，K2=100（m3H), then according to equation (3):
V3=0.1*（2*0.018/（0.15%-0.05%））（m3/h）+100（m3/h）=103.6（m3/h）。
by comparison of V2≥V3If the fresh air volume is V = V2。
If the V is obtained by calculation and comparison2≤V3If the fresh air volume is V = V3。
The fresh air handling unit 10 operates by taking the fresh air volume V as the target air volume, namely, selects larger fresh air volume as the target air volume to operate, and realizes the rapid reduction of indoor CO2And the concentration preferentially ensures the use experience of the user.
During operation of the fresh air handling unit 10, the control unit 60 may set the indoor CO to be supplied at intervals (e.g., 15 minutes)2Concentration, outdoor CO2And detecting the concentration and the outdoor PM2.5 concentration.
According to the comparison between the outdoor PM2.5 and the PM2.5 concentration limit, whether the fresh air unit 10 is operated or not is determined, namely when the outdoor PM2.5 is higher than the PM2.5 concentration limit, the fresh air unit 10 is not operated, and when the outdoor PM2.5 is lower than the PM2.5 concentration limit, the fresh air unit 10 is operated.
Based on indoor CO in the case of operation of the fresh air handling unit 102And determining the target air volume of the operation of the fresh air handling unit 10 according to the concentration.
Indoor CO2When the concentration is larger than the second limit value, the fresh air quantity is adjustedV is used as the target air volume of 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 an ARM chip and a peripheral circuit, and the ARM chip can adopt LM3S8970 to control the fresh air handling unit.
The application provides a new trend system can be according to indoor CO2The concentration obtains the fresh air volume that fresh air unit 10 needs, satisfies the user to the demand of new trend, and can realize energy-conservation, reduces the fresh air unit 10 energy consumption.
In addition, the fresh air handling unit 10 further includes an anemometer (not shown) for detecting an airflow velocity of an activity area of a person in a room, and an actual air volume in the room can be acquired by the airflow velocity.
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 by taking the target air volume as a target.
The anemometer in the application has a plurality of probes which respectively detect the air flow velocities at a plurality of points in an active area, and the actual air volume is obtained by calculating the average value of the air flow velocities at the plurality of points, so that the accuracy is high.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or 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 handling unit;
a first detection unit for detecting at least CO of an indoor environment in real time2Concentration;
a second detection unit for detecting CO of outdoor environment in real time2Concentration 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 indoor CO when the PM2.5 concentration of the outdoor environment is below the PM2.5 concentration limit2When the concentration is greater than the first limit value and less than or equal to a second limit value, calculating the fresh air volume V of the fresh air handling unit according to a formula (1)1(ii) a Indoor CO2When the concentration is greater than the second limit value, respectively calculating the fresh air volume V according to a formula (2) and a formula (3)2And V3And taking the larger value of the two as the fresh air volume V;
control unit of indoor CO2When the concentration is less than or equal to the first limit value, controlling the fresh air handling unit to operate by taking preset air volume as target air volume; indoor CO2When the concentration is greater than the first limit value and less than or equal to the second limit value, controlling the fresh air unit to supply fresh air volume V1Operating for a target air volume; indoor CO2When the concentration is greater than the second limit value, controlling the fresh air unit to operate by taking the fresh air volume V as a target air volume;
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE001
（1）；
Figure 395048DEST_PATH_IMAGE002
（2）；
Figure DEST_PATH_IMAGE003
（3）；
p-number of people indoors, x0CO exhaled by each person2Constant, K1And K2Is constant and K1＜K2，yinPreset indoor CO2Concentration, yout-outdoor CO2Concentration, S-room area, H-room floor height, n-ventilation times.
2. The fresh air system as recited in claim 1, further comprising:
a storage unit storing the in-house design CO2Concentration limit table, indoor design CO2The concentration limit table comprises at least one stage of CO2Concentration limit and/or secondary CO2A concentration limit;
the preset indoor CO2Concentration design of CO from the Chamber2And selecting from a concentration limit table.
3. The fresh air system of claim 2,
designing CO in the room2The concentration limit table includes a first level CO2Concentration limit and secondary CO2At the limit of concentration, the first stage CO2Concentration limit less than the secondary CO2Concentration limit.
4. The fresh air system of claim 1,
said K10 to 30 (m)3H), and said K2Is 50 to 100 (m)3H); and/or
And n is 2-10 times.
5. The fresh air system as claimed in any one of claims 1 to 4,
the fresh air handling unit comprises an outdoor fresh air inlet;
the second detection unit is arranged at the outdoor fresh air port.
6. The fresh air system as recited in claim 1, further comprising:
and the air conditioner indoor unit is used for adjusting the indoor air temperature.
7. The fresh air system of claim 1,
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 people in a room.
8. The fresh air system as recited in claim 1, further comprising:
an anemometer for detecting an air flow velocity of an indoor human activity area.
CN202210203686.9A 2021-08-23 2022-03-03 Fresh air system Active CN114508824B (en)

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