CN113376076A - Fresh air system PM2.5 filtering effect field detection device and detection method - Google Patents
Fresh air system PM2.5 filtering effect field detection device and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 230000000694 effects Effects 0.000 title claims abstract description 30
- 238000001914 filtration Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 62
- 239000000779 smoke Substances 0.000 claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 43
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 15
- 231100000719 pollutant Toxicity 0.000 claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 7
- 235000019504 cigarettes Nutrition 0.000 claims description 26
- 238000009423 ventilation Methods 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 238000004887 air purification Methods 0.000 claims description 12
- 238000000746 purification Methods 0.000 claims description 10
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- 238000013461 design Methods 0.000 claims description 9
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- 238000012360 testing method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 238000013178 mathematical model Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
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- 238000003908 quality control method Methods 0.000 claims description 3
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- 150000001875 compounds Chemical class 0.000 claims description 2
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- 238000005192 partition Methods 0.000 description 4
- 238000003915 air pollution Methods 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a fresh air system PM2.5 filtering effect field detection device and a detection method, wherein the device comprises a flue gas generation chamber, a gas stirring chamber and a gas collection chamber, wherein the flue gas generation chamber is used for generating simulated pollutants; the smoke generating chamber is connected with external air through a vacuum pump, and the vacuum pump is provided with a rotating speed adjusting device to control the flow of air pumped into the smoke generating chamber; the gas stirring chamber is positioned at the upper part of the smoke generating chamber, the gas stirring chamber is communicated with the smoke generating chamber, a first grid guide plate is arranged at the communication position, and the first grid guide plate is used for uniformly guiding smoke produced by the smoke generating chamber into the gas stirring chamber; a flue gas stirring device is arranged in the gas stirring chamber; the gas collection chamber is positioned at the upper part of the gas stirring chamber, the gas collection chamber is communicated with the gas stirring chamber, and a second grid guide plate is arranged at the communication position and is used for guiding the flue gas uniformly stirred in the gas stirring chamber into the gas collection chamber; the top of the gas collection chamber is provided with a gas outlet.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a device and a method for detecting the PM2.5 filtering effect of a fresh air system on site.
Background
With the development of economy and the improvement of health consciousness of people, a fresh air system with a PM2.5 purification function is widely used. However, at the present stage, the PM2.5 filtration efficiency of the fresh air system was measured under laboratory conditions. In actual engineering, although the PM2.5 purification performance of the fresh air system is specified by standards such as "air purification device for ventilation system" GB/T34012-. In actual engineering, the detection of the filtering effect of the PM2.5 of the fresh air system can be carried out at any air pollution level, and when the outdoor air quality is good, the detection result cannot accurately reflect the purifying effect of the PM2.5 of the fresh air system.
Therefore, how to provide an instant PM2.5 filtering effect detection method for a fresh air system without being limited by the outdoor air pollution level and ensuring the accuracy of the detection result becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems of time lag and inaccurate detection result caused by the fact that field detection is limited by outdoor air pollution level in the prior art, and provides a field detection device for the PM2.5 filtering effect of a fresh air system to ensure the instantaneity of PM2.5 filtering effect detection and the accuracy of the detection result of the fresh air system.
The technical problem to be solved can be implemented by the following technical scheme.
The utility model provides a new trend system PM2.5 filter effect field detection device which characterized in that does, includes:
the smoke generating chamber is connected with the outside air through a vacuum pump, and the vacuum pump is provided with a speed regulating device so as to selectively control the air flow pumped into the smoke generating chamber; and
the gas stirring chamber is positioned at the upper part of the smoke generating chamber, the gas stirring chamber is communicated with the smoke generating chamber, a first grid guide plate is arranged at the communication position, and the first grid guide plate is used for uniformly guiding smoke produced by the smoke generating chamber into the gas stirring chamber; a stirring device for stirring the flue gas from the flue gas generation chamber is arranged in the gas stirring chamber; and
the gas collection chamber is positioned at the upper part of the gas stirring chamber, the gas collection chamber is communicated with the gas stirring chamber, a second grid guide plate is arranged at the communication position, and the second grid guide plate is used for guiding the flue gas uniformly stirred in the gas stirring chamber into the gas collection chamber;
and the top of the gas collection chamber is provided with a gas outlet.
As a further improvement of the technical scheme, a drawer-type combustion box which can be inserted into the smoke generating chamber is arranged on the chamber wall of the smoke generating chamber, and the push-pull end of the drawer-type combustion box is positioned at the outer side end of the smoke generating chamber.
As a further improvement of the technical scheme, a drawer type collecting box used for receiving or collecting combustion residues is arranged at the lower side position of the drawer type combustion box, and the push-pull end of the drawer type collecting box is also positioned at the outer side end of the smoke generating chamber.
In a preferred embodiment of the present invention, the burning material in the drawer type burning box is a cigarette.
As a further improvement of the present technical solution, the stirring device is more than one stirring fan.
As a further improvement of the technical scheme, the vacuum pump and the connecting pipeline thereof are arranged in an air inlet control chamber.
As another preferred embodiment of the present invention, the rotation speed adjusting device of the vacuum pump includes a speed adjusting knob, and the speed adjusting knob is disposed on an outer sidewall of a chamber wall of the intake control chamber.
The invention also aims to provide a detection method for performing PM2.5 filtering effect field detection by adopting the PM2.5 filtering effect field detection device of the fresh air system.
The detection method comprises the following steps:
1) the stable state mathematical model of indoor PM2.5 concentration when establishing no PM2.5 source, having the new trend system and adopting new trend to purify is as follows:
αlo＝αi+α0 (2)
in the formula (I), the compound is shown in the specification,
c is indoor concentration, mu g/m3；
C0In the case of outdoor concentration,. mu.g/m3；
αlVentilating for infiltration wind for times/h;
Plis a penetration coefficient and has no dimension;
αothe times of ventilation of fresh air are divided into times/h;
αlothe number of times of ventilation of the room is divided into times/h;
ηothe purification efficiency of the fresh air purification equipment is dimensionless;
2) acquiring purification efficiency eta of fresh air purification equipmento；
3) Closing the door and window of the room, and obtaining the penetration coefficient P according to the airtight condition of the roomlTaking a value within 0.6-0.9;
4) opening the fresh air system of the room, and measuring the ventilation times alpha of the room by using a tracer gas methodlo；
5) Based on this on-the-spot detection device, send the simulation pollutant at outdoor new trend entrance, simulation pollutant sending process is as follows:
a. providing a gas transmission pipeline which comprises a first end and a second end which are oppositely arranged, communicating the first end with a gas outlet of a PM2.5 generating device, and placing the second end at an outdoor fresh air inlet;
b. starting to generate pollutants in the smoke generating chamber;
c. pumping air into the smoke generating chamber at the lowest rotating speed of the vacuum pump which can be set;
d. PM2.5 concentration C at outdoor fresh air inlet measured by PM2.5 concentration tester0Adjusting the amount of air pumped by the vacuum pump according to the test requirement so as to meet the required pollutant generation amount;
6) and in the process of continuously generating pollutants, measuring the concentration C of PM2.5 at the outdoor fresh air inlet0And indoor PM2.5 concentration C; when a plurality of air outlets exist indoors, taking the average value of the instant PM2.5 concentrations in the room where each air outlet is located as an instant indoor PM2.5 concentration C;
7) c to be measured0、C、Pl、ηo、αloSubstituting the formula (1) and (2) to calculate the ventilation frequency alpha of the infiltration airlAnd the number of times of ventilation of fresh air alphao；
When alpha islWhen the air quantity is more than 0, judging that the room has the permeating air, and obtaining the ventilation frequency alpha of the permeating air of the roomlAnd the number of times of ventilation of fresh air alphao；
When alpha islWhen the air permeability is less than or equal to 0, judging that no air permeability exists in the room, and changing the air permeability for a time alphalC, number of air changes of room αloNamely the fresh air change times alphaoAnd obtaining the purification efficiency eta of the modified fresh air purification equipment by using the formula (1) for inverse calculationo；
8) The outdoor PM2.5 concentration C is adjusted0Adjusting the concentration to the concentration required in public building indoor air quality control design standard JGJ/T461-2019, and calculating the indoor PM2.5 concentration when the fresh air system operates under the outdoor design daily concentration according to the parameters obtained in the steps 2), 3) and 7);
9) and repeating the steps 6) to 8) for a plurality of times according to the set times to obtain the indoor PM2.5 concentration at a plurality of times, and taking the average value of the indoor PM2.5 concentrations at the corresponding times as a final result.
As a preferred form of the detection method, the simulated pollutant sending process in step 5) is as follows:
a. providing a gas transmission pipeline which comprises a first end and a second end which are oppositely arranged, communicating the first end with a gas outlet of a PM2.5 generating device, and placing the second end at an outdoor fresh air inlet;
b. providing simulated pollutants by smoke generated by burning the cigarettes, opening the drawer-type cigarette burning box, placing the burning cigarettes in the drawer-type cigarette burning box, and then pushing and pulling the drawer-type cigarette burning box to close;
c. rotating the speed regulating knob to the minimum rotating speed gear of the vacuum pump, and pumping air into the smoke generating chamber;
d. PM2.5 concentration C at outdoor fresh air inlet measured by PM2.5 concentration tester0And according to the test requirement, the smoke volume of the PM2.5 generating device is manually adjusted, and the smoke volume is increased or reduced by selecting a speed regulating knob.
Also as a preferred form of the detection method, in step 9),
and repeating the steps 6) to 8) three times to obtain the indoor PM2.5 concentrations at three moments, and taking the average value of the indoor PM2.5 concentrations at the three moments as a final result.
According to the fresh air system PM2.5 filtering effect on-site detection instrument and method provided by the invention, a PM2.5 environment with a certain concentration level is created at an outdoor fresh air inlet in an artificial smoking mode, and the indoor PM2.5 concentration during the operation of the fresh air system is obtained by an indirect calculation method under the outdoor design daily concentration, so that the detection of the PM2.5 filtering effect of the fresh air system is not limited by the outdoor air quality condition any more, and the instantaneity of the PM2.5 filtering effect detection of the fresh air system and the accuracy of the detection result are ensured.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a PM2.5 filtering effect field detection device of a fresh air system;
FIG. 2 is a schematic structural diagram of the appearance of the PM2.5 filtering effect field detection device of the fresh air system;
FIG. 3 is a flow chart of a field detection method for PM2.5 filtering effect of a fresh air system according to the present invention;
in the figure: 1-smoke generating chamber, 11-air inlet control chamber, 12-combustion control chamber, 13-second gas transmission pipeline, 14-first grid type guide plate, 15-first gas transmission pipeline, 16-first gas inlet, 17-second gas inlet, 18-partition plate, 2-stirring chamber, 21-stirring fan, 22-second grid type guide plate, 3-gas collection chamber, 31-gas outlet, 5-speed regulator, 6-speed regulating knob, 7-vacuum pump, 71-vacuum pump gas inlet, 72-vacuum pump gas outlet, 8-cigarette combustion box and 9-ash collecting box.
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.
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 and right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of simplifying the description of the present invention, and do not indicate or imply that the resulting device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first" and "second" 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, features defining "first", "second", may explicitly or implicitly include one or more features. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified 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 connected; can be mechanically or electrically connected; the connection may be direct or indirect through an intermediate medium, and the connection may be a communication between the two elements. 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 expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
The fresh air system PM2.5 filtering effect field detection device shown in fig. 1 and fig. 2 mainly comprises a smoking chamber 1, a stirring chamber 2, a gas collection chamber 3, a speed regulator 5, a speed regulation knob 6, a vacuum pump 7, a cigarette burning box 8 and an ash collecting box 9.
A partition plate 18 is arranged in the smoke generating chamber 1, the partition plate 18 divides the smoke generating chamber 1 into an air inlet control chamber 11 and a combustion control chamber 12, a first air inlet 16 is arranged on the inner wall of the air inlet control chamber 11, is communicated with air outside the chamber and is communicated with an air inlet 71 of the vacuum pump 7 through a first air transmission pipeline 15, and a second air inlet 17 is arranged on one side of the partition plate 18, which is close to the air inlet control chamber 11, is communicated with the combustion control chamber 12 and is communicated with an air outlet 72 of the vacuum pump 7 through a second air transmission pipeline 13. The vacuum pump 7 and the governor 5 are fixed on the bottom plate of the intake control chamber 11 in the horizontal direction. The speed regulator knob (the speed regulating knob 6 in the figure) is arranged on the shell of the smoke generating chamber 1 and is used for controlling the voltage output by the speed regulator 5. The speed governor 5 is used to control the rotational speed of the vacuum pump 7. The vacuum pump 7 is used for conveying air outside the smoking chamber 1 into the combustion control chamber 12 for burning cigarettes in the cigarette burning box 8. The cigarette burning box 8 and the ash collecting box 9 are arranged in the burning control chamber 12 in the vertical direction, and can be drawn out from the burning control chamber 12 in the horizontal direction. The cigarette burning box 8 is positioned right above the ash collecting box 9. The cigarette burning box 8 is used for containing burning cigarettes, and the ash collecting box 9 is used for containing ash/ash generated by burning the cigarettes in the cigarette burning box 8.
The top of the air inlet control cavity 11 is sealed by a top plate, the combustion control cavity 12 is vertically communicated with the stirring chamber 2, and a first grid type guide plate 14 is arranged and used for uniformly guiding the flue gas generated in the combustion control cavity 12 to the stirring chamber 2, and the first grid type guide plate 14 is horizontally arranged at the junction of the combustion control cavity 12 and the stirring chamber 2. The geometric centers of the two sides of the stirring chamber 2 are respectively provided with a stirring fan 21 for uniformly stirring and mixing the smoke generated in the combustion control cavity 12 of the smoke generating chamber 1 in the stirring chamber 2.
The stirring chamber 2 is vertically communicated with the gas collection chamber 3, a second grid type guide plate 22 is arranged at the top plate along the horizontal direction, and the second grid type guide plate 22 is used for guiding flue gas uniformly stirred in the stirring chamber 2 into the gas collection chamber 3. The air outlet 31 is provided on the ceiling of the plenum chamber 3 in the vertical direction and communicates with the plenum chamber 3.
Referring to fig. 3, based on the field detection device of the invention, a resident room of a certain residential district in Hangzhou is selected as a test object, and the PM2.5 filtering effect of a fresh air system of the residential district is tested. The household is located at one floor of the building, and the indoor area is 79.6m2And a fresh air system is installed, and fresh air purification is adopted. The new fan is located the kitchen furred ceiling, leaves the detection mouth of renew cartridge, and the new trend entry is located the outer facade of kitchen, indoor 5 fresh air mouths altogether.
The fresh air system PM2.5 filtering effect field detection method of the embodiment comprises the following steps:
1) the method comprises the following steps of establishing a stable mathematical model of indoor PM2.5 concentration when no PM2.5 source exists, a fresh air system exists and fresh air purification is adopted, and the stable mathematical model comprises the following steps:
αlo＝αl+αo (2)
in the formula: c is indoor concentration, mu g/m3；
C0In the case of outdoor concentration,. mu.g/m3；
αlVentilating for infiltration wind for times/h;
Plis a penetration coefficient and has no dimension;
αothe times of ventilation of fresh air are divided into times/h;
αlothe number of times of ventilation of the room is divided into times/h;
ηothe purification efficiency of the fresh air purification equipment is dimensionless;
2) obtaining the purification efficiency eta o of the fresh air purification equipment to be 0.96 by consulting the specification;
3) closing doors and windows of a room, wherein the room has better air tightness, and the penetration coefficient Pl is 0.6;
4) opening the fresh air system of the room and using CO2Measuring air change times a of room by tracer gas methodlo1.13 times/h;
5) based on the field detection device, smoke is generated at the outdoor fresh air inlet, and the smoke generation process is as follows:
a. providing a gas transmission pipeline which comprises a first end and a second end which are oppositely arranged, communicating the first end with a gas outlet 31 of a PM2.5 generating device, and placing the second end at an outdoor fresh air inlet;
b. opening the cigarette burning box 8, placing the burning cigarette therein, and then closing the cigarette burning box 8 (after inserting the drawn cigarette burning box, closing the external door, the inside of the cigarette burning box is still communicated with the burning control chamber);
c. rotating the knob 6 of the speed governor clockwise to the minimum gear, and pumping air into the combustion control chamber 12;
d. PM2 at outdoor fresh air inlet measured by PM2.5 concentration tester5 concentration C0Is 106. mu.g/m3. According to the test requirement of JGJ/T461-2019, the PM2.5 design daily concentration in Hangzhou is 230 mu g/m3Therefore, the speed regulating knob 6 needs to be rotated clockwise to increase the smoke volume of the PM2.5 generating device, and the PM2.5 concentration C at the fresh air inlet is adjusted0Raised to 230. mu.g/m3Left and right;
6) in the process of continuous fuming, the concentration C of PM2.5 at the outdoor fresh air inlet is measured0And indoor PM2.5 concentration C, see table 1. Taking the average value of the PM2.5 concentration of the room where each air supply outlet is positioned at the moment as the indoor PM2.5 concentration C at the moment;
table 1: PM2.5 concentration at indoor and fresh air inlet measured at different times
7) C is to be0、C、Pl、ηo、αloSubstituting into the formulas (1) and (2) to calculate the ventilation frequency alpha of the roomlAnd the number of times of ventilation of fresh air alphaoSee table 2;
8) the outdoor PM2.5 concentration C0Adjusted to 230 mu g/m of Hangzhou outdoor design daily concentration required in 'design Standard for indoor air quality control of public buildings' JGJ/T461-20193And according to the parameters obtained in the steps 2), 3) and 7), the indoor PM2.5 concentration can be calculated when the fresh air system runs under the outdoor design daily concentration, and the concentration is shown in a table 2.
9) And repeating the steps 6) to 8) three times to obtain the indoor PM2.5 concentrations at three moments, and taking the average value of the indoor PM2.5 concentrations at the three moments as a final result. As shown in Table 2, the PM2.5 concentration of the test room on the outdoor calculation day was 230. mu.g/m by indirect calculation3When the fresh air system is in operation, the concentration of indoor PM2.5 is 26.3 mu g/m3。
Table 2: indoor PM2.5 concentration obtained by indirect calculation at different times
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (10)
1. The utility model provides a new trend system PM2.5 filter effect field detection device which characterized in that includes:
the smoke generating chamber is connected with the outside air through a vacuum pump, and the vacuum pump is provided with a speed regulating device so as to selectively control the air flow pumped into the smoke generating chamber; and
the gas stirring chamber is positioned at the upper part of the smoke generating chamber, the gas stirring chamber is communicated with the smoke generating chamber, a first grid guide plate is arranged at the communication position, and the first grid guide plate is used for uniformly guiding smoke produced by the smoke generating chamber into the gas stirring chamber; a stirring device for stirring the flue gas from the flue gas generation chamber is arranged in the gas stirring chamber; and
the gas collection chamber is positioned at the upper part of the gas stirring chamber, the gas collection chamber is communicated with the gas stirring chamber, a second grid guide plate is arranged at the communication position, and the second grid guide plate is used for guiding the flue gas uniformly stirred in the gas stirring chamber into the gas collection chamber;
and the top of the gas collection chamber is provided with a gas outlet.
2. The fresh air system PM2.5 filtering effect field detection device as claimed in claim 1, wherein a drawer type combustion box capable of being inserted into the chamber is arranged on the chamber wall of the flue gas generation chamber, and the push-pull end of the drawer type combustion box is located at the outer side end of the flue gas generation chamber.
3. The fresh air system PM2.5 filtering effect on-site detecting device of claim 2, wherein a drawer type collecting box for receiving or collecting the combustion residue is disposed at a lower side of the drawer type combustion box, and a pushing end and a pulling end of the drawer type collecting box are also disposed at an outer side end of the smoke generating chamber.
4. The fresh air system PM2.5 filtering effect field detection device as claimed in claim 2 or 3, wherein the burning objects in the drawer type burning box are cigarettes.
5. The fresh air system PM2.5 filtering effect field detection device of claim 1, wherein the stirring device is more than one stirring fan.
6. The fresh air system PM2.5 filtering effect field detection device as claimed in claim 1, wherein the vacuum pump and the connecting pipeline thereof are placed in an air inlet control chamber.
7. The fresh air system PM2.5 filtering effect field detection device of claim 1, wherein the rotation speed adjustment device of the vacuum pump comprises a speed adjustment knob, and the speed adjustment knob is arranged on an outer side wall of the chamber wall of the air inlet control chamber.
8. A detection method for PM2.5 filtering effect field detection by adopting the fresh air system PM2.5 filtering effect field detection device of any one of claims 1 to 7 is characterized by comprising the following steps:
1) the stable state mathematical model of indoor PM2.5 concentration when establishing no PM2.5 source, having the new trend system and adopting new trend to purify is as follows:
in the formula (I), the compound is shown in the specification,
c is indoor concentration, mu g/m3；
C0In the case of outdoor concentration,. mu.g/m3；
αlVentilating for infiltration wind for times/h;
Plis a penetration coefficient and has no dimension;
αnthe times of ventilation of fresh air are divided into times/h;
αlnthe number of times of ventilation of the room is divided into times/h;
ηnthe purification efficiency of the fresh air purification equipment is dimensionless;
2) acquiring purification efficiency eta of fresh air purification equipmentn；
3) Closing the door and window of the room, and obtaining the penetration coefficient P according to the airtight condition of the roomlTaking a value within 0.6-0.9;
4) opening the fresh air system of the room, and measuring the ventilation times alpha of the room by using a tracer gas methodln；
5) Based on this on-the-spot detection device, send the simulation pollutant at outdoor new trend entrance, simulation pollutant sending process is as follows:
a. providing a gas transmission pipeline which comprises a first end and a second end which are oppositely arranged, communicating the first end with a gas outlet of a PM2.5 generating device, and placing the second end at an outdoor fresh air inlet;
b. starting to generate pollutants in the smoke generating chamber;
c. pumping air into the smoke generating chamber at the lowest rotating speed of the vacuum pump which can be set;
d. PM2.5 concentration C at outdoor fresh air inlet measured by PM2.5 concentration tester0Adjusting the amount of air pumped by the vacuum pump according to the test requirement so as to meet the required pollutant generation amount;
6) and in the process of continuously generating pollutants, measuring the concentration C of PM2.5 at the outdoor fresh air inlet0And indoor PM2.5 concentration C; for chamberWhen a plurality of air supply outlets exist, taking the average value of the real-time PM2.5 concentration of the room where each air supply outlet is located as the real-time indoor PM2.5 concentration C;
7) c to be measuredo、C、Pl、ηo、αloSubstituting the formula (1) and (2) to calculate the ventilation frequency alpha of the infiltration airlAnd the number of times of ventilation of fresh air alphao；
When alpha islWhen the air quantity is more than 0, judging that the room has the permeating air, and obtaining the ventilation frequency alpha of the permeating air of the roomiAnd the number of times of ventilation of fresh air alphao；
When alpha islWhen the air permeability is less than or equal to 0, judging that no air permeability exists in the room, and changing the air permeability for a time alphai0, number of air changes of room αioNamely the fresh air change times alphaoAnd obtaining the purification efficiency eta of the modified fresh air purification equipment by using the formula (1) for inverse calculationo；
8) The outdoor PM2.5 concentration C is adjusted0Adjusting the concentration to the concentration required in public building indoor air quality control design standard JGJ/T461-2019, and calculating the indoor PM2.5 concentration when the fresh air system operates under the outdoor design daily concentration according to the parameters obtained in the steps 2), 3) and 7);
9) and repeating the steps 6) to 8) for a plurality of times according to the set times to obtain the indoor PM2.5 concentration at a plurality of times, and taking the average value of the indoor PM2.5 concentrations at the corresponding times as a final result.
9. The detection method according to claim 8, wherein the simulated pollutant sending process in step 5) is as follows:
a. providing a gas transmission pipeline which comprises a first end and a second end which are oppositely arranged, communicating the first end with a gas outlet of a PM2.5 generating device, and placing the second end at an outdoor fresh air inlet;
b. providing simulated pollutants by smoke generated by burning the cigarettes, opening the drawer-type cigarette burning box, placing the burning cigarettes in the drawer-type cigarette burning box, and then pushing and pulling the drawer-type cigarette burning box to close;
c. rotating the speed regulating knob to the minimum rotating speed gear of the vacuum pump, and pumping air into the smoke generating chamber;
d. PM2.5 concentration C at outdoor fresh air inlet measured by PM2.5 concentration tester0And according to the test requirement, the smoke volume of the PM2.5 generating device is manually adjusted, and the smoke volume is increased or reduced by selecting a speed regulating knob.
10. The detection method according to claim 8, wherein, in step 9),
and repeating the steps 6) to 8) three times to obtain the indoor PM2.5 concentrations at three moments, and taking the average value of the indoor PM2.5 concentrations at the three moments as a final result.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499946A (en) * | 2023-06-25 | 2023-07-28 | 粤水电建筑安装建设有限公司 | Detector for basement decoration |
| CN116975505A (en) * | 2023-09-25 | 2023-10-31 | 北京科技大学 | Method for calculating distribution of pollutants in room during pollution release of ventilation air conditioning system with return air |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499946A (en) * | 2023-06-25 | 2023-07-28 | 粤水电建筑安装建设有限公司 | Detector for basement decoration |
| CN116499946B (en) * | 2023-06-25 | 2023-09-29 | 粤水电建筑安装建设有限公司 | Detector for basement decoration |
| CN116975505A (en) * | 2023-09-25 | 2023-10-31 | 北京科技大学 | Method for calculating distribution of pollutants in room during pollution release of ventilation air conditioning system with return air |
| CN116975505B (en) * | 2023-09-25 | 2024-01-02 | 北京科技大学 | Method for calculating distribution of pollutants in room during pollution release of ventilation air conditioning system with return air |
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