CN110361310A - A kind of CADR measurement method of room rate of ventilation - Google Patents
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Abstract
The present invention provides a kind of CADR measurement methods of room rate of ventilation, belong to Building Indoor Environment detection technique field.Its technical solution are as follows: with the PM of naturally occurring in air2.5As probe material, according to there is air purifier different moments indoor and outdoor PM in room2.5The measured data of concentration, the physical model established according to mass balance principle are iterated fitting to measured data, and ventilation of room rate of ventilation is determined in calculating.The invention has the benefit that the invention proposes a kind of PM with naturally occurring in air2.5As probe material, and according to indoor and outdoor PM when having air purifier in room2.5The measured data of concentration, the physical model according to mass balance equation is iterated fitting to measured data, to obtain the measurement method of ventilation of room rate of ventilation.
Description
Technical field
The present invention relates to a kind of CADR of Building Indoor Environment detection technique field more particularly to room rate of ventilation measurements
Method.
Background technique
With the progress at full speed of world economy, requirement of the people to air quality in living environment is also higher and higher.Ventilation
Number all has a significant impact to indoor environmental quality (IEQ) and building energy consumption.Being aerated using outdoor air to room can be with
The moisture and pollutant of indoor discharge are removed, therefore rooms of buildings usually requires sufficiently high ventiduct roadbed, to avoid shadow
The problems such as ringing IEQ and personnel health, the reduction of indoor environment comfort level, absence from work without reason and productivity caused to decline.Energy from the current whole world
From the point of view of source consumes specific gravity, building is the important object of energy consumption and the main source of greenhouse gas emission, and heating, ventilation and
Air-conditioning system is most essential component part in building energy service, accounts for about the 50% of building energy consumption, excessively high ventilation is changed
Tolerance can make the energy-output ratio of building further increase and generate additional energy-related cost.Therefore as evaluation Interior Space
The key parameter of the important indicator and assessment building energy Expenditure Levels of makings amount and situation of divulging information, the measurement of rate of ventilation just become
It obtains particularly significant.
Mainly measure the ventilation rate in room using tracer gas technique both at home and abroad at present.Tracer gas technique is to quilt
Search gas is discharged with certain forms in ell, by measuring the concentration variation of tested point to obtain ventilation of room ventilation time
Several experimental methods.It can be generalized into four kinds of basic skills, i.e. descent method (concentration decline method), (accumulation of constant method for releasing
Method), transient state mass balance approach and indoor constant density method (steady state method).Four kinds of method basic principles are identical, wherein concentration decline
Rate of ventilation of the method due to can easily measure room and the external world, and it is the most simple and easy to do, therefore outer ventilation time indoors
It is used widely in several measurements；CO2It is the search gas mainly used at present because its is easy to use.
But gas concentration lwevel decaying law regulation, carbon dioxide source of release cannot be had by measuring room in measurement process, or
Allow source of release lower there are intensity and stable rate of release only to guarantee the gas concentration lwevel in room during measurement
In stablizing downward trend.Human body is obviously unsatisfactory for this requirement as natural carbon dioxide source of release, therefore carbon dioxide declines
Method needs guarantee that interior cannot have personnel activity or stop in measurement process, otherwise will make a big impact to experimental result.
This has strict requirements and limitation to the time of measuring of rate of ventilation and place again, brings many inconvenience to measurement work.
How to solve above-mentioned technical problem is the project that the present invention faces.
Summary of the invention
The shadow that the purpose of the present invention is to provide a kind of convenience accurately to measure ventilation of room ventilation volume, is not stopped by personnel
It rings, facilitate that data acquisition, data processing be reliable, strong operability, convenient for actually detected and engineer application room rate of ventilation
CADR measurement method.
The present invention is realized by following measure: a kind of CADR measurement method of room rate of ventilation, wherein with air
The PM of middle naturally occurring2.5As probe material, according to there is air purifier different moments indoor and outdoor PM in room2.5The reality of concentration
Measured data, the physical model established according to mass balance principle are iterated fitting to measured data, and calculating determines that room is logical
Wind rate of ventilation.
A kind of CADR measurement method of the room rate of ventilation based on claim 1, wherein the following steps are included:
1) establishing in measurement room has air purifier without PM2.5The PM of indoor and outdoor under conditions of source2.5The number of concentration variation
It is as follows to learn model:
In formula (1)-(2): CinFor indoor accelerated test concentration (μ g/m3)；C∞When having air purifier for interior in room
Stable grain size object concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient；Q ' is
Ventiduct roadbed (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0To test initial 0 moment
Indoor PM2.5Concentration；V is the volume (m in room3)；T is the time (h)；
2) by two PM2.5Density real-time monitoring instrument is respectively placed in outdoor and interior, for PM inside and outside measuring chamber2.5Concentration,
Concentration before being not switched on air purifier is initial concentration C0；
3) air purifier is opened, CADR value, indoor PM are set2.5Change with time occurs for concentration；
4) the interior PM in the step 3)2.5During change with time occurs for concentration, using PM2.5Concentration monitor point
It Ce Liang not indoor and outdoor PM under different time2.5Concentration；
5) it is based on above-mentioned model, by the indoor and outdoor PM under measurement resulting different moments in step 4)2.5Concentration data processing
Linear fitting is carried out at the form of equation (1), then to time t, a slope value is obtained, adjusts the value of Q ', keep slope absolute
Value is equal to CADR/V, and Q'/V is exactly the rate of ventilation in room.
Scheme, the step are advanced optimized as a kind of CADR measurement method of room rate of ventilation provided by the invention
It is rapid 5) specifically: it is assumed that the value of a Q ', is denoted as Q ', the Q ' formula (2) substituted into step 1) can be acquired into indoor accelerated test
Css C∞', by C∞' and the indoor accelerated test that measures by when concentration delta data CinWith PM in the initial zero moment room of test2.5
Concentration C0It substitutes into formula (1), and is fitted with time of measuring t, can get slope absolute value m；IfCompare m with
The value of α, if the two is equal, the Q ' value obtained is ventilation of room ventilation volume Q, and Q'/V is room rate of ventilation；If the two not phase
Deng, then adjust the value of Q ', repeat above-mentioned fit procedure, until both it is equal, the Q'/V at the correspondence moment is room ventilation time
Number.
It is described as a kind of scheme that advanced optimizes of the CADR measurement method of room rate of ventilation provided by the invention
In step 1), P value is 1.
Specifically, in order to which foregoing invention purpose is better achieved, the present invention also provides a kind of room rate of ventilation
CADR measurement method, specifically includes the following steps:
1) establishing in measurement room has air purifier without PM2.5The PM of indoor and outdoor under conditions of source2.5The number of concentration variation
It is as follows to learn model:
In formula (1)-(2): CinFor indoor accelerated test concentration (μ g/m3)；C∞When having air purifier for interior in room
Stable grain size object concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient, P value
It is 1；Q ' is ventiduct roadbed (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0To test just
Begin 0 moment interior PM2.5Concentration；V is the volume (m in room3)；T is the time (h)；
2) by two PM2.5Density real-time monitoring instrument is respectively placed in outdoor and interior, for PM inside and outside measuring chamber2.5Concentration,
Concentration before being not switched on air purifier is initial concentration C0；
3) air purifier is opened, CADR value, indoor PM are set2.5Change with time occurs for concentration；
4) the interior PM in the step 3)2.5During change with time occurs for concentration, using PM2.5Concentration monitor point
It Ce Liang not indoor and outdoor PM under different time2.5Concentration；
5) it is based on above-mentioned model, by the indoor and outdoor PM under measurement resulting different moments in step 4)2.5Concentration data processing
Linear fitting is carried out at the form of equation (1), then to time t, a slope value is obtained, adjusts the value of Q ', keep slope absolute
Value is equal to CADR/V, and Q'/V is exactly the rate of ventilation in room；Particular content are as follows: it is assumed that the value of a Q ', is denoted as Q ', by Q ' generation
The formula (2) entered in step 1) can acquire indoor accelerated test Css C∞', by C∞' and the indoor accelerated test that measures by when it is dense
Spend delta data CinWith PM in the initial zero moment room of test2.5Concentration C0It substitutes into formula (1), and is intended with time of measuring t
It closes, can get slope absolute value m；IfCompare the value of m and d, if the two is equal, which is ventilation of room ventilation
Q is measured, Q'/V is room rate of ventilation；Both if the two is unequal, the value of Q ' is adjusted, repeats above-mentioned fit procedure, until
Equal, the Q'/V at the correspondence moment is room rate of ventilation.
The invention has the benefit that the invention proposes a kind of PM with naturally occurring in air2.5As tracer
Matter, and according to indoor and outdoor PM when having air purifier in room2.5The measured data of concentration, the physics according to mass balance equation
Model is iterated fitting to measured data, to obtain the measurement method of ventilation of room ventilation volume；Since human body does not distribute
PM2.5, therefore, CO is utilized compared to traditional2The ventilation of room ventilation measuring method of search gas is done, the method for the present invention excludes
Influence of the human body as probe material source of release to experimental result, on the daily routines of indoor occupant almost without influence；We
Method has the characteristics of short experimental period, strong operability, is convenient for engineer application, does probe material according to using particulate matter, as far as possible
The characteristics of avoiding influence to measurement result of human factor in measurement process.
Detailed description of the invention
Fig. 1 is the overall flow schematic diagram for the step of iterative calculation obtains ventilation rate in the embodiment of the present invention.
Fig. 2 is that PM after air purifier is opened in the room of the measurement rate of ventilation of the embodiment of the present invention 12.5The line of concentration
Property fitting result schematic diagram.
Fig. 3 is that PM after air purifier is opened in the room of the measurement rate of ventilation of the embodiment of the present invention 22.5The line of concentration
Property fitting result schematic diagram.
Fig. 4 is that PM after air purifier is opened in the room of the measurement rate of ventilation of the embodiment of the present invention 32.5The line of concentration
Property fitting result schematic diagram.
Specific embodiment
In order to clarify the technical characteristics of the invention, being illustrated below by specific embodiment to this programme.
Embodiment 1
Referring to figure 1 and figure 2, air purifier is placed in measured room, so that interior PM2.5Concentration is by time-varying
Change, choose testing location of certain University Classroom's as ventiduct roadbed, which is located at 4 layers of position of certain 5 layers building, classroom body
Product is 148m3, measurement has the fan that room air can be made uniformly mixed at the top of room, and room is not closed, have for personnel into
Door out and the window for ventilation, air purifier are placed in the middle part of room；PM2.5Measurement of concetration uses ELPM2.5- 100 exist in real time
Line PM2.5Monitor, indoor PM2.5Density real-time monitoring instrument is placed on the desk in the middle part of room, outdoor PM2.5Density real-time monitoring
Instrument is placed on windowsill outside window；The analysis processing of data uses EXCEL worksheet.
The key parameter measuring method of the present embodiment the following steps are included:
1) establishing in measurement room has air purifier, and without PM2.5The PM of indoor and outdoor under conditions of source2.5Concentration variation
Mathematical model, it may be assumed that
In formula: CinFor indoor accelerated test concentration (μ g/m3)；C∞Stable grain size when having air purifier for interior in room
Object concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient (dimensionless), and value is
1；Q is ventiduct roadbed (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0To test preliminary examination 0
Moment interior PM2.5Concentration；V is the volume (m in room3)；T is the time (h).
2) by two ELPM2.5- 100 real-time online PM2.5Monitor is respectively placed in outdoor and interior, for inside and outside measuring chamber
PM2.5Concentration CinAnd Cout；
3) air purifier is opened, sets CADR value as 360m3/ h, indoor PM2.5Change with time occurs for concentration；
4) in the process, ELPM2.5- 100 real-time online PM2.5Monitor to be that time interval measures not respectively per minute
With the indoor and outdoor PM under the time2.5Concentration is divided into 1 minute between time of measuring, and continuous measurement 30 minutes obtains indoor and outdoor each 30
Data point；
5) be based on above-mentioned model, the form for resulting concentration data will be measured being processed into formula (1), then to time t into
The fitting of line shape, obtains a slope value, adjusts the value of Q, so that slope absolute value is equal to CADR/V, Q at this time is exactly room
Between ventiduct roadbed, Q/V is the ventilation rate that measures, and the gravity-flow ventilation that fitting measures under the conditions of closing window in this example is changed
Gas number is 0.24h-1, matched curve is as shown in Figure 2.
Embodiment 2
Referring to Fig. 1 and Fig. 3, in the embodiment, testing location of certain University Classroom's as ventiduct roadbed, the classroom are chosen
The five layers of position built positioned at certain five layers, classroom volume are 147m3, measurement room top, which has, can be such that room air is uniformly mixed
Fan, room is not closed, has door pass in and out for personnel and for the window of ventilation, air purifier is placed in room middle part；
PM2.5Measurement of concetration uses PM2.5Density real-time monitoring instrument, the PM2.5Density real-time monitoring instrument is clear ring QD-M1 strong greatly, indoor
PM2.5Density real-time monitoring instrument is placed on the desk in the middle part of room, outdoor PM2.5Density real-time monitoring instrument is placed in windowsill outside window
On；The analysis processing of data uses EXCEL worksheet.
Required parametric measurement method in the present embodiment the following steps are included:
1) establishing in measurement room has air purifier and without PM2.5The PM of indoor and outdoor under conditions of source2.5Concentration variation
Mathematical model:
In formula: CinFor indoor accelerated test concentration (μ g/m3)；C∞Stable grain size when having air purifier for interior in room
Object concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient (dimensionless), and value is
1；Q is ventiduct roadbed (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0To test preliminary examination 0
Moment interior PM2.5Concentration；V is the volume (m in room3)；T is the time (h).
2) by two PM2.5Density real-time monitoring instrument is respectively placed in outdoor and interior, for PM inside and outside measuring chamber2.5Concentration Cin
And Cout；
3) air purifier is opened, sets CADR value as 240m3/ h leads to indoor PM2.5Change with time occurs for concentration；
4) in the process, PM2.5Concentration monitor to measure the interior under different time respectively for time interval per minute
Outer PM2.5Concentration is divided into 1 minute between time of measuring, and continuous measurement 30 minutes obtains each 30 data points of indoor and outdoor；
5) be based on above-mentioned model, the form for resulting concentration data will be measured being processed into formula (1), then to time t into
The fitting of line shape, obtains a slope value, adjusts the value of Q, so that slope absolute value is equal to CADR/V, Q at this time is exactly room
Between ventiduct roadbed, Q/V is the ventilation rate that measures, and the gravity-flow ventilation that fitting measures under the conditions of closing window in this example is changed
Gas number is 0.73h-1, matched curve is as shown in Figure 3.
Embodiment 3
Referring to Fig. 1 and Fig. 4, in the embodiment, testing location of certain University Classroom's as ventiduct roadbed, the classroom are chosen
The five layers of position built positioned at certain five layers, classroom volume are 63m3, instrumentation plan is as shown in Figure 1, have can at the top of measurement room
The fan for keeping room air uniformly mixed, room is not closed, and with the door passed in and out for personnel and for the window of ventilation, air is net
Change device to be placed in the middle part of room；PM2.5Measurement of concetration uses PM2.5Density real-time monitoring instrument, the PM2.5 density real-time monitoring instrument are
Clear strong greatly ring QD-M1, indoor PM2.5Density real-time monitoring instrument is placed on the desk in the middle part of room, outdoor PM2.5Density real-time monitoring
Instrument is placed on windowsill outside window, and the analysis processing of data uses EXCEL worksheet；
The parametric measurement method of the present embodiment the following steps are included:
1) establishing in measurement room has air purifier and without PM2.5The PM of indoor and outdoor under conditions of source2.5Concentration variation
Mathematical model:
In formula: CinFor indoor accelerated test concentration (μ g/m3)；C∞Stable grain size when having air purifier for interior in room
Object concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient (dimensionless), and value is
1；Q is ventiduct roadbed (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0To test preliminary examination 0
Moment interior PM2.5Concentration；V is the volume (m in room3)；T is the time (h).
2) by two PM2.5Density real-time monitoring instrument is respectively placed in outdoor and interior, for PM inside and outside measuring chamber2.5Concentration Cin
And Cout；
3) air purifier is opened, sets CADR value as 240m3/ h leads to indoor PM2.5Change with time occurs for concentration；
4) in the process, PM2.5Concentration monitor to measure the interior under different time respectively for time interval per minute
Outer PM2.5Concentration is divided into 1 minute between time of measuring, and continuous measurement 30 minutes obtains each 30 data points of indoor and outdoor；
5) it is based on above-mentioned model, resulting concentration data will be measured is processed into the form of the formula (1) of step 1), it is then right
Time t carries out linear fitting, obtains a slope value, adjusts the value of Q, so that slope absolute value is equal to CADR/V, Q at this time
It is exactly the ventiduct roadbed in room, Q/V is the ventilation rate measured, and fitting measures the nature closed under the conditions of window in this example
Ventilation rate is 0.35h-1, matched curve is as shown in Figure 4.
Technical characteristic of the present invention without description can realize that details are not described herein by or using the prior art, certainly,
The above description is not a limitation of the present invention, and the present invention is also not limited to the example above, the ordinary skill of the art
The variations, modifications, additions or substitutions that personnel are made within the essential scope of the present invention also should belong to protection model of the invention
It encloses.
Claims (4)
1. a kind of CADR measurement method of room rate of ventilation, which is characterized in that with the PM of naturally occurring in air2.5As showing
Track substance, according to there is air purifier different moments indoor and outdoor PM in room2.5The measured data of concentration, it is former according to mass balance
The physical model then established is iterated fitting to measured data, and ventilation of room rate of ventilation is determined in calculating.
2. a kind of CADR measurement method of the room rate of ventilation based on claim 1, which comprises the following steps:
1) establishing in measurement room has air purifier without PM2.5The PM of indoor and outdoor under conditions of source2.5The mathematical modulo of concentration variation
Type is as follows:
In formula (1)-(2): CinFor indoor accelerated test concentration (μ g/m3)；C∞It is steady in room when having air purifier for interior
State particle concentration (μ g/m3)；CoutFor outdoor particulate matter mean concentration (μ g/m3)；P is particulate matter penetrating coefficient；Q ' is ventilation
Ventilation volume (m3/h)；CADR is the Clean air delivery rate (m that air purifier purifies3/h)；C0It is indoor to test initial 0 moment
PM2.5Concentration；V is the volume (m in room3)；T is the time (h)；
2) by two PM2.5Density real-time monitoring instrument is respectively placed in outdoor and interior, for PM inside and outside measuring chamber2.5Concentration, not
Concentration before opening air purifier is initial concentration C0；
3) air purifier is opened, CADR value, indoor PM are set2.5Change with time occurs for concentration；
4) the interior PM in the step 3)2.5During change with time occurs for concentration, using PM2.5Concentration monitor is surveyed respectively
Measure the indoor and outdoor PM under different time2.5Concentration；
5) it is based on above-mentioned model, by the indoor and outdoor PM under measurement resulting different moments in step 4)2.5The concentration data side of being processed into
The form of journey (1), then linear fitting is carried out to time t, a slope value is obtained, the value of Q ' is adjusted, makes slope absolute value etc.
In the rate of ventilation that CADR/V, Q'/V are exactly room.
3. the CADR measurement method of room rate of ventilation according to claim 2, which is characterized in that the step 5) is specific
Are as follows: it is assumed that the value of a Q ', is denoted as Q ', the Q ' formula (2) substituted into step 1) can be acquired into indoor accelerated test Css
C∞', by C∞' and the indoor accelerated test that measures by when concentration delta data CinWith PM in the initial zero moment room of test2.5Concentration C0Generation
Enter in formula (1), and be fitted with time of measuring t, can get slope absolute value m；IfCompare the value of m and α, if
The two is equal, then Q ' the value that the correspondence moment obtains is ventilation of room ventilation volume Q, and Q'/V is room rate of ventilation；If the two is not
It is equal, then the value of Q ' is adjusted, above-mentioned fit procedure is repeated, until the two is equal, the Q'/V at the correspondence moment is room ventilation
Number.
4. the CADR measurement method of room rate of ventilation according to claim 1, which is characterized in that the step 1)
In, P value is 1.
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| CN111397840A (en) * | 2020-04-17 | 2020-07-10 | 朗思科技有限公司 | Indoor ventilation frequency rapid detection device based on sulfur hexafluoride tracer gas |
| CN111551386A (en) * | 2020-05-27 | 2020-08-18 | 东南大学 | Room ventilation frequency measuring method based on PM2.5 concentration rebound |
| CN112818281A (en) * | 2021-01-04 | 2021-05-18 | 深圳市奇信集团股份有限公司 | Method and equipment for calculating pollutant release rate of interior decoration material |
| CN114493270A (en) * | 2022-01-26 | 2022-05-13 | 中认国证(北京)评价技术服务有限公司 | Method and system for testing room ventilation times based on carbon dioxide release source |
| CN114486652A (en) * | 2021-06-30 | 2022-05-13 | 南京工业大学 | Building natural ventilation quantity measuring method based on PM2.5 concentration recovery data |
| CN115325655A (en) * | 2022-08-19 | 2022-11-11 | 珠海格力电器股份有限公司 | Display method and device for sterilization process, air conditioner and storage medium |
| WO2024010047A1 (en) * | 2022-07-05 | 2024-01-11 | ダイキン工業株式会社 | Air change rate estimating device, ventilation amount estimating device, air change rate estimating method, and program |
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