CN111380145A - Fresh air quantity real-time monitoring method for fresh air machine - Google Patents
Fresh air quantity real-time monitoring method for fresh air machine Download PDFInfo
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- CN111380145A CN111380145A CN202010196469.2A CN202010196469A CN111380145A CN 111380145 A CN111380145 A CN 111380145A CN 202010196469 A CN202010196469 A CN 202010196469A CN 111380145 A CN111380145 A CN 111380145A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 230000003068 static effect Effects 0.000 claims abstract description 32
- 238000004887 air purification Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- F24F11/0001—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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
-
- 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
- F24F11/56—Remote control
-
- 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
- F24F11/0001—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
- F24F2110/40—Pressure, e.g. wind pressure
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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)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a method for monitoring fresh air volume of a fresh air machine in real time, wherein the fresh air machine comprises the following steps: a power sensor that monitors an input power of a fresh air side of the fresh air machine; the pressure difference sensor monitors the static pressure difference between the fresh air side and the air outlet side of the fresh air fan; the Pitot static pressure pipe is connected with a differential pressure sensor and used for monitoring the dynamic pressure of the air outlet side of the fresh air fan; wherein: determining a corresponding first new air volume (Q0) under the input power according to the input power of the new fan obtained by the power sensor and the air volume-power corresponding relation of the new fan; determining a second fresh air volume (Q') corresponding to the static pressure difference according to the static pressure difference between the fresh air side and the air outlet side of the fresh air fan obtained by the pressure difference sensor and the air volume-static pressure corresponding relation of the fresh air fan; and determining a third fresh air volume (Q) corresponding to the dynamic pressure at the air outlet side of the fresh air fan according to the dynamic pressure at the air outlet side of the fresh air fan obtained by the Pitot static pressure tube.
Description
Technical Field
The invention belongs to the technical field of air purification, and particularly relates to a fresh air volume real-time monitoring method of a fresh air fan.
Background
The fresh air machine is an air processing system which introduces outdoor fresh air into the room from the outside, and the supply of the fresh air into the room is an important measure for improving the indoor air quality and ensuring the health and comfort of personnel.
The new fan utilizes new trend convection technique, through independently supplying air and induced air, makes the room air realize the convection current to the indoor air replacement of carrying out of great degree, the new fan built-in multi-functional clean system guarantees to get into indoor air clean and healthy.
Design specifications of buildings with different functions have minimum requirements on fresh air volume, and meanwhile, along with long-time operation of a fresh air fan, purification energy efficiency is continuously reduced, so that real-time monitoring of changes of the fresh air volume is very important. The detection method of the fresh air volume in the existing standard comprises a Pitot static pressure tube traversing method, an anemometer detection method and an air volume cover detection method, wherein the anemometer detection method is not beneficial to real-time detection because a sensor of an anemometer probe is easy to damage, high in manufacturing cost and unstable; the air volume cover detection method is also not suitable for monitoring fresh air volume in real time due to high cost; there is a need for an economical and effective method of monitoring fresh air volume in real time.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent so as to provide an economical and effective fresh air volume real-time monitoring method for a fresh air fan.
The invention provides a method for monitoring fresh air volume of a fresh air machine in real time, wherein the fresh air machine comprises the following steps: a power sensor that monitors an input power of a fresh air side of the fresh air machine; the pressure difference sensor monitors the static pressure difference between the fresh air side and the air outlet side of the fresh air fan; the Pitot static pressure pipe is connected with a differential pressure sensor and used for monitoring the dynamic pressure of the air outlet side of the fresh air fan; determining a corresponding first new air volume under input power according to the input power of the new air blower obtained by a power sensor and the air volume-power corresponding relation of the new air blower; determining a second fresh air volume corresponding to the static pressure difference according to the static pressure difference of the fresh air side and the air outlet side of the fresh air fan obtained by the pressure difference sensor and the air volume-static pressure corresponding relation of the fresh air fan; and determining the third fresh air volume corresponding to the dynamic pressure according to the dynamic pressure of the air outlet side of the fresh air fan obtained by the Pitot static pressure pipe.
In one embodiment, whether the purification energy efficiency of the new fan is reduced is judged according to current data and historical record data of one of the first new air volume, the second new air volume and the third new air volume.
In one embodiment, when the first fresh air volume, the second fresh air volume, or the third fresh air volume is within a close threshold range, it is determined that the fresh air purification energy efficiency is reduced.
In one embodiment, the power sensor is remotely connected to a computer and transmits the input power of the fresh air side of the fresh air machine to the computer.
In one embodiment, the differential pressure sensor is remotely connected to a computer and transmits the static pressure difference between the fresh air side and the air outlet side of the fresh air machine to the computer.
In one embodiment, the pitot static pressure tube is remotely connected with a computer, and the dynamic pressure item on the air outlet side of the fresh monitoring fan is transmitted to the computer.
In one embodiment, the third fresh air volume is determined according to a proportional relationship between a pipe diameter of an air outlet of the new fan and dynamic pressure of the air outlet of the new fan.
Thus, on one hand, the invention provides various economic methods for monitoring the dynamic performance of the fresh air machine in real time; the invention further provides a method, the fresh air purifying efficiency of the fresh air fan is obtained by monitoring the change of fresh air volume obtained by each method in the operation process of the fresh air fan and combining the particulate matter purifying efficiency and the rated power, and the purifying efficiency is improved by replacing the filter material after the fresh air volume is reduced to a certain proportion.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the drawings, in which:
fig. 1 is a schematic view of a new fan system according to the present invention.
Fig. 2 is a schematic structural diagram of the method for monitoring the fresh air volume of the fresh air machine in real time.
Wherein, 10-fresh air machine; 12-an inlet end filter; 14-an outlet end filter; 16-fresh air machine power curve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
New fan system
Fig. 1 schematically illustrates a new fan system of the present invention.
In the figure, the new air blower 10 is arranged in the ventilation channel, and the arrow points to represent the flow direction of the air.
Wherein the inlet end filter 12 is disposed at a corresponding air inlet and the outlet end filter 14 is disposed at a corresponding air outlet. It should be understood that the filter may be a HEPA filter, or an electrostatic precipitation filter, or both.
HEPA refers to High Efficiency Particulate Air, namely, the HEPA filter screens have different grades, the most common European standards are divided into coarse Efficiency (G1-G4), medium Efficiency (M5-M6), medium Efficiency (F7-F9), sub-High Efficiency (E10-E12), High Efficiency (H13-H14) and ultra-High Efficiency (U15-U17), and the higher the grade is, the better the filtering effect is.
The electrostatic dust collection (or dust removal) technology is applied to the industrial field at the earliest time, and the electrostatic dust collection (or dust removal) technology utilizes the principle that positive and negative charges attract each other, forms a strong electric field through high voltage, generates a large amount of electrons and ions, collides with and adheres to the particles of air, and is then adsorbed by a dust collection plate in a fresh air fan or a purifier, so that the particles are removed and the air is purified.
The power sensor (not shown in the figure) monitors the input power of the fresh air side of the fresh air fan, and the corresponding fresh air volume under the input power can be obtained by combining the air volume-power performance curve 16 of the fresh air fan. Alternatively, a differential pressure sensor (not shown in the figure) monitors the static pressure difference between two sides of the new fan, and the corresponding new air volume under the static pressure difference can be obtained by combining the air volume-static pressure curve of the fan (which will be described in detail later).
In addition, the new fan system can also use a pitot static pressure pipe (not shown in the figure), and the pitot static pressure pipe is connected with a differential pressure sensor to monitor the dynamic pressure of the outlet of the new fan, so as to obtain the corresponding fresh air volume under the dynamic pressure.
Method for monitoring fresh air volume of fresh air fan in real time
After the fresh air fan system is started, the power sensor monitors the input power of the fresh air fan and remotely transmits the monitored data to the computer; the pressure difference sensor monitors the static pressure difference of two sides of the fresh air fan and remotely transmits the monitored data to the computer; the Pitot static pressure pipe is connected with a differential pressure sensor to monitor the dynamic pressure of the air outlet side of the fresh air fan and remotely transmit the monitored data to a computer.
The input power of the fresh air side of the fresh air fan is monitored by adopting a power sensor, and the corresponding fresh air quantity Q0 under the input power can be obtained by combining the air quantity-power performance curve of the fan. The static pressure difference of two sides of a fresh air fan in the fresh air fan is monitored, and the corresponding fresh air quantity Q' under the static pressure difference can be obtained by combining an air quantity-static pressure curve of the fan. The new air quantity can be obtained in real time by monitoring the input power by utilizing the existing new fan air quantity-power performance curve (the new air quantity is indirectly obtained, and because the conventional anemometer has higher cost for testing the air quantity, an air speed probe is easy to damage, and the like; and an air quantity cover air quantity testing method is not suitable for real-time monitoring). Similarly, the fresh air quantity can be obtained in real time by monitoring the static pressure difference at two sides of the fresh air fan by utilizing the existing fresh air fan air quantity-static pressure curve. In practical application, the air volume-power performance curve and the air volume-static pressure curve may be suitable for different fan forms, and the two curves can be mutually used as check data or a calibration technical mode is selected according to actual conditions.
And monitoring the dynamic pressure of the fresh air side of the fresh air fan at the air outlet side through the Pitot static pressure tube and the differential pressure sensor, thereby calculating the fresh air quantity Q of the fresh air fan. The formula is shown in fig. 1.
In the formula:
q-air volume of new fan, m3/h；
d is the diameter of the air outlet pipe of the fresh air fan, m;
p is dynamic pressure of an air outlet of the fresh air fan, Pa;
rho-air density, kg/m3。
The computer stores and compares the fresh air quantity Q0 corresponding to the input power with a set threshold, or compares the fresh air quantity Q' corresponding to the static pressure difference with a set threshold, or compares the fresh air quantity Q calculated according to the dynamic pressure with a set threshold, and compares according to historical data records, so as to judge whether the filter material needs to be replaced to improve the purification energy efficiency.
For example, if the fresh air volume Q calculated from the dynamic pressure deviates from the set threshold range, it is suggested that the particulate matter purification efficiency is reduced, and the fresh air volume corresponding to the rated power cannot be achieved by the fresh air blower system. For another example, when the monitored fresh air volume exceeds the fresh air volume reduction percentage set by the computer, the filter material needs to be replaced so as to improve the purification energy efficiency of the fresh air fan.
Advantages of the real-time monitoring method of the invention
The method of the invention has the following advantages and conveniences:
the scheme of the invention is suitable for monitoring and calculating the fresh air volume of the fresh air fan in real time.
Its typical advantages are: the fresh air quantity of the fresh air fan can be monitored in real time by monitoring parameters which are easy to monitor, inputting power, static pressure and dynamic pressure and by a curve or a calculation formula.
Therefore, the method monitors the change of the fresh air volume in the operation process of the fresh air fan through various methods for monitoring the dynamic performance of the fresh air fan in real time, and obtains the purification energy efficiency of the fresh air fan by combining the particulate matter purification efficiency and the rated power. After the fresh air volume is reduced to a certain proportion, the purification energy efficiency is improved by replacing the filter material.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A method for monitoring fresh air volume of a new fan in real time comprises the following steps:
a power sensor that monitors an input power of a fresh air side of the fresh air machine;
the pressure difference sensor monitors the static pressure difference between the fresh air side and the air outlet side of the fresh air fan;
the Pitot static pressure pipe is connected with a differential pressure sensor and used for monitoring the dynamic pressure of the air outlet side of the fresh air fan; the method is characterized in that:
determining a corresponding first new air volume (Q0) under the input power according to the input power of the new fan obtained by the power sensor and the air volume-power corresponding relation of the new fan;
determining a second fresh air volume (Q') corresponding to the static pressure difference according to the static pressure difference between the fresh air side and the air outlet side of the fresh air fan obtained by the pressure difference sensor and the air volume-static pressure corresponding relation of the fresh air fan;
and determining a third fresh air volume (Q) corresponding to the dynamic pressure at the air outlet side of the fresh air fan according to the dynamic pressure at the air outlet side of the fresh air fan obtained by the Pitot static pressure tube.
2. The method according to claim 1, characterized in that whether the fresh air purification energy efficiency is reduced is judged according to current data and historical data of one of the first fresh air quantity (Q0), the second fresh air quantity (Q') and the third fresh air quantity (Q).
3. The method according to claim 1, characterized in that when the first fresh air quantity (Q0), the second fresh air quantity (Q'), or the third fresh air quantity (Q) is within a close threshold range, it is judged that the fresh air purification energy efficiency is reduced.
4. The method of claim 1, wherein the power sensor is remotely connected to a computer and transmits the input power to the fresh air side of the fresh air machine to the computer.
5. The method of claim 1, wherein the differential pressure sensor is remotely connected to a computer and transmits the static pressure differential between the fresh air side and the air outlet side of the fresh air machine to the computer.
6. The method of claim 1 wherein the pitot static tube is remotely connected to a computer for transmitting the dynamic pressure on the air outlet side of the monitoring fresh air machine to the computer.
7. The method according to claim 1, characterized in that the third fresh air volume (Q) is determined according to a proportional relationship between a fresh air fan outlet pipe diameter and a fresh air fan outlet dynamic pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196469.2A CN111380145A (en) | 2020-03-19 | 2020-03-19 | Fresh air quantity real-time monitoring method for fresh air machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010196469.2A CN111380145A (en) | 2020-03-19 | 2020-03-19 | Fresh air quantity real-time monitoring method for fresh air machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3992536A1 (en) * | 2020-10-29 | 2022-05-04 | Siemens AG Österreich | Method and device for determining the air flow volume through a ventilation pipe of a ventilation system |
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| EP3992536A1 (en) * | 2020-10-29 | 2022-05-04 | Siemens AG Österreich | Method and device for determining the air flow volume through a ventilation pipe of a ventilation system |
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