CN110044788A - The method for determining house porosity equivalent aera At and calculating gas exchange rate - Google Patents
The method for determining house porosity equivalent aera At and calculating gas exchange rate Download PDFInfo
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- CN110044788A CN110044788A CN201910238094.9A CN201910238094A CN110044788A CN 110044788 A CN110044788 A CN 110044788A CN 201910238094 A CN201910238094 A CN 201910238094A CN 110044788 A CN110044788 A CN 110044788A
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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Abstract
This application involves safe technical fields, more particularly to a kind of determining house porosity equivalent aera At and the method for calculating gas exchange rate, under conditions of the determination method includes: the temperature value T outside different chamber, measured house is measured under defined sealing condition, the gas exchange rate E of corresponding each temperature value；According to the corresponding relationship of temperature value obtained and gas exchange rate E, data fitting is carried out；According to the data fitting result, porosity equivalent aera At is determined；The Air-cleaning technique E and outdoor temperature T that evaluate measured house and outside air are established corresponding relationship by the application, to provide the operable method of determining porosity equivalent aera At a kind of.
Description
Technical field
This application involves safe technical fields, and in particular to a kind of determining house porosity equivalent aera At and meter
The method for calculating gas exchange rate.The application provides a kind of gas friendship that house is calculated using house porosity equivalent aera At simultaneously
The method for changing rate.
Background technique
The generation of safety accident often will cause huge economic loss, influence the normal life of people.Especially changing
The region of work garden either high sulfur Gas Fields, once accident occurs, while can bring the leakage of poison gas, the life of the periphery public
Safety will will receive great threat.Therefore, it is necessary to the sprawlings for poison gas to make assessment, give the periphery public and pacify rapidly
The guidance evacuated entirely.
It is that safe is carried out by the variation of the poison gas concentration inside prediction house in the prior art, inside house
Gas content can be characterized by parameter Q, can specifically be expressed as Q=D*At* (Ca-Cb), wherein Q is to enter in house
Gas flow；D is diffusion coefficient, comes from Maxwell-gilliland correlation, and mass diffusion coefficient D is indicated along dispersal direction, in list
Under conditions of the time per unit concentration gradient of position, perpendicular through the quality or molal quantity of the spread something of unit area.
CaFor the gas concentration of external environment, CbFor the gas concentration inside house, Ca-CbIndicate that gas is dense inside and outside house
Spend gradient.D*(Ca-Cb) then indicate in (Ca-Cb) concentration gradient under, the gaseous mass of house list time of unit area diffusion
Or molal quantity.
Porosity equivalent aera At is a kind of customized index of applicant, is meant that characterization gas diffusion enters house
When the floor space that passes through, after having known porosity equivalent aera At, formula Q=D*At* (C can be passed througha-Cb) be calculated
Into the gas flow in house.The physical meaning of At is under the conditions of house keeps relatively closed, and house itself has a large amount of meat
Eye is invisible or be difficult to the gap noticed, can pass in and out house by these void gas, the area in these gaps and with
The volume ratio in house is characterized with At.Therefore, a kind of intrinsic index of the At as house, different building structures have not
Same porosity equivalent aera At value.But since building construction and extraneous hole can not naked eyes directly observation or shapes
Irregularly, though put into data that a large amount of manpower and material resources are tested may also accuracy it is inadequate, practice can not be applied to.Therefore,
Need the operable method of determining porosity equivalent aera At a kind of.
Summary of the invention
The application provides a kind of determination and the method using house porosity equivalent aera At, to solve not having in the prior art
There is the operable method problem of determining porosity equivalent aera At.The application provides a kind of utilization above-mentioned porosity equivalent simultaneously
The method of area At calculating house gas exchange rate.
The application provides the method for determining house porosity equivalent aera At a kind of, comprising:
Outside different chamber under conditions of temperature value T, measured house is measured under defined sealing condition, corresponding each temperature
The gas exchange rate E of angle value；
According to the corresponding relationship of temperature value obtained and gas exchange rate E, data fitting is carried out；
According to the data fitting result, porosity equivalent aera At is determined.
Optionally, described under conditions of temperature value T, to measure measured house in defined sealing condition outside different chamber
Under, the gas exchange rate E of corresponding each temperature value includes:
Test point in measured house places concentration determination instrument；
The indoor closed environment for keeping measured house, discharges search gas, and keep the search gas uniform indoors
Diffuse to the inner space in entire measured house；
The concentration value of the time point search gas corresponding with time point when record measurement；
It is changed with time according to the concentration value of the search gas, determines gas exchange rate E.
Optionally, further includes: when the test point in measured house places concentration determination instrument, indoors at least three
Test point places concentration determination instrument；
In the case that the concentration deviation of search gas to three test points is less than threshold value, time t1 is recorded；
With the time t1 be test gas exchange rate E test start time point, until in house search gas concentration
When dropping to preset value, terminate the test of house gas exchange rate E.
Optionally, the indoor closed environment for keeping measured house is being executed, is discharging search gas indoors, and made described
Search gas uniformly diffuses to before the inner space step in entire measured house, further includes:
Measure the background value of the indoor environment in measured house.
Optionally, the concentration value according to the search gas changes with time, and determines gas exchange rate E, specifically
It is: gas exchange rate E is obtained using simple regression method.
Optionally, the search gas is sulfur hexafluoride gas.Optionally, the temperature value is K value；It is described
According to the corresponding relationship of temperature value obtained and gas exchange rate E, carrying out data fitting includes:
Two/cube of K value is subjected to linear regression processing with the numerical value of corresponding gas exchanges rule E；
Correspondingly, the straight slope that processing is obtained is as porosity equivalent aera At.
The present invention also provides a kind of methods using porosity equivalent aera At measurement house gas exchange rate, comprising:
Obtain the porosity equivalent aera At in house；
Obtain the outdoor temp angle value T in the house, wherein handling the outdoor temp angle value T is the two of K value
/ cube；
According to the porosity equivalent aera At and treated outdoor temp angle value T, obtain described to ell
The gas exchange rate E in room.
Compared with prior art, the invention has the following advantages that
The method of determining house porosity equivalent aera At provided by the present application a kind of, passes through the temperature value T outside different chamber
Under conditions of, measured house is measured under defined sealing condition, the gas exchange rate E of corresponding each temperature value；According to institute
The temperature value of acquisition and the corresponding relationship of gas exchange rate E, carry out data fitting；According to the data fitting result, hole is determined
Porosity equivalent aera At.At the application establishes the Air-cleaning technique E and outdoor temperature T that evaluate measured house and outside air
Corresponding relationship, to provide the operable method of determining porosity equivalent aera At a kind of.
The application provides a kind of method using porosity equivalent aera At measurement house gas exchange rate, this method simultaneously
The gas exchange rate of house in certain circumstances simply can be calculated using the porosity equivalent aera in house, thus for hair
Preliminary judgment basis is provided as refuge when making trouble former.
Detailed description of the invention
Fig. 1 is the schematic illustration of the measurement environment of the embodiment of the present application porosity equivalent aera At；
Fig. 2 is the method flow diagram that the embodiment of the present application determines house porosity equivalent aera At；
Fig. 3 is the method flow diagram of the embodiment of the present application measurement Air-cleaning technique E；
Fig. 4 is the structural schematic diagram in the embodiment of the present application house；
Fig. 5 and Fig. 6 is the fitting result schematic diagram of concentration data and time data；
Fig. 7 is the fitting result schematic diagram of porosity equivalent aera At；
Fig. 8 is the method flow diagram of the embodiment of the present application application house porosity equivalent aera At.
Specific embodiment
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention.But the present invention can be with
Much it is different from other way described herein to implement, those skilled in the art can be without prejudice to intension of the present invention the case where
Under do similar popularization, therefore the present invention is not limited to the specific embodiments disclosed below.
Referring to FIG. 1, it illustrates the schematic illustrations of the measurement environment of the embodiment of the present application porosity equivalent aera At.
It includes: house 100 and outdoor environment 200 that the present embodiment, which measures environment,.When measuring porosity equivalent aera At value, need in house
Gas exchanges are carried out between 100 and outdoor environment 200, specifically, gas concentration exists in house 100 and outdoor environment 200
Concentration gradient, under the conditions ofs the temperature of outdoor environment 200 or atmosphere wind speed, air pressure etc., gas is in house 100 and outdoor environment
It is swapped between 200.
The technical solution of the application for ease of description need to be further described house 100, so as to clear the application
Technical solution in house porosity equivalent aera At measurement scene and application scenarios.
In the measurement scene of the porosity equivalent aera At in house, house 100 is properly termed as measured house, specifically
Be: measured house is to discharge search gas in doors, and the search gas inside house 100 is kept to have certain concentration value,
Search gas is diffused from the high concentration value in house 100 to outdoor environment 200.
In the application scenarios of the porosity equivalent aera At in house, house 100 is properly termed as house of taking refuge, specifically:
It takes refuge house, the difference with measured house is that the term using house of taking refuge refers to: outdoor environment 200 contains high concentration
Toxic gas, and house 100 be nontoxic atmospheric environment, the toxic gas of high concentration from outdoor environment 200 to house 100 into
Row diffusion.
In the technical solution of the application, measured house and house of taking refuge may each be that common building is either special to be kept away
Differentiation is only made in difficult place on the dispersal direction of gas, in order to further illustrate the technical solution of the application.
Firstly the need of explanation, in the embodiment of the present application, involved term are as follows:
Air-cleaning technique E refers to that for volume be V (m3) measured house or house of taking refuge for, unit volume
Room air inflow (m3/s)。
Maxwell-gilliland correlation:
Wherein, D be gas A in gas B (or B is in A) diffusion coefficient, unit m2/s；T is thermodynamic temperature,
Unit is K；P is total pressure, unit Pa；μ A, μ B are respectively the molecular weight of gas A, B；VA, VB are respectively gas A, B just
Liquid Ke Moer volume when normal boiling point, unit cm3/gmol.
Mass balance equation: Vin=Vout, wherein VinFor room air inflow, unit m3/s；VoutFor room capacity,
Unit is m3/s。
Applicant show that the gas flow into house can also be characterized as Q=E*V* from the angle analysis of Air-cleaning technique E
Cb, wherein V is the volume in house, CbFor the gas concentration inside house, C in test processaIt is defaulted as 0, CaOutside house
Gas concentration.Applicant obtains E*C in turnb=Q=-D*At* (Ca-Cb), wherein-(Ca-Cb) in negative sign indicate outdoor ring
The gas concentration of 200 reduction of border, since the gas concentration of 200 reduction of outdoor environment can consider that the gas inside equal to house is dense
Degree, and then obtain At=E/D.
The type and its temperature and pressure for depending mainly on the size of diffusate and dispersive medium of diffusion coefficient D.Consider
To taking refuge, house is predominantly located in air, therefore gaseous species are constant, and dispersive medium is constant, by diffusate ginseng related to medium
Number merges into a (a is constant), therefore obtains D=a*T3/2.It further obtains, At=E/D=E/ (a*T3/2)。
House 100 is regarded to the control volume of a control search gas disengaging as, then the quality of search gas is flat in house 100
Weigh equation are as follows: V*dCb/dt=Vin*Ca-Vout*Cb, wherein dCb/dtIndicate the change of the concentration of search gas inside house at any time
Change value.
According to mass balance equation Vin=Vout, obtain V*dCb/dt=Vin*(Ca-Cb), as t=1min, and then obtain E
=Vin/ V=-Ln { (Ca-CB, 1)/(Ca-Cb,0), wherein Cb,0For the beginning concentration of search gas, Cb,1For the tracer after 1 minute
The concentration of gas.
It is as follows by the test method for being derived from E above: to be kept using the quality inside and outside measured house when gas exchanges
Permanent principle, due to the inside and outside air exchange in house, the concentration of gas exponentially decays with the variation of time, according to gas concentration
The rate of decay, obtain Air-cleaning technique E.
To sum up, in the At=E/D=E/ (a*T being derived from3/2) in formula, Air-cleaning technique E and outdoor environment temperature T
It is the numerical value that can be measured, and after measuring Air-cleaning technique E and outdoor environment temperature T, carries out simple data processing just
It can get porosity equivalent aera At.
The technical solution of the application, applicant will evaluate Air-cleaning technique E and the outdoor in measured house and outside air
Temperature T establishes corresponding relationship, to provide the operable method of determining porosity equivalent aera At a kind of.
Specific embodiment presented below describes in detail and illustrates to the technical solution of the application.
Referring to figure 2., it illustrates the method streams of determining house porosity equivalent aera At provided by the embodiments of the present application
Cheng Tu.It is explained below in conjunction with attached drawing.
Step S100 outside different chamber under conditions of temperature value T, measures measured house under defined sealing condition,
The gas exchange rate E of corresponding each temperature value.
It measures Air-cleaning technique E to test using concentration decline method, i.e., fills a certain amount of show in advance in measured house
Track gas, concentration of the search gas in measured house exponentially decays with the variation of time, according to trace gas concentration
The rate of decay, calculate the Air-cleaning technique E in measured house.
Referring to figure 3., it illustrates the method flow diagrams of measurement Air-cleaning technique E.
It is described under conditions of temperature value T, to measure measured house under defined sealing condition outside different chamber, it is corresponding each
The gas exchange rate E of a temperature value includes:
Step S110, the test point in measured house place concentration determination instrument.
In the present embodiment, the quantity of test point is configured generally according to the overall structure in house, usually setting three with
The different position in house is gone up and be distributed in, measurement of the single test point when measuring concentration decline in house can be eliminated in this way and missed
Difference guarantees the validity of measurement data.On the other hand, multiple test points are set, before measurement starts, by comparing different location
The house that measures of test point in search gas concentration value, it can be determined that it is whole whether search gas has been evenly distributed in
In a house.In the case that the concentration value deviation for the search gas that each test point measures is less than threshold value, record is started simultaneously at
The concentration decline initial time of each test point, so as to effectively determine the starting point of concentration decline in house.
There are two types of models for the concentration measuring instrument tool, respectively correspond different measurement patterns.Wherein, a kind of measuring instrument
It is that gas sensor is wholely set with desktop computer, needs to observe the variation of concentration in real time inside house；Another measuring instrument
It may be implemented to observe detectable concentration in real time outside house by gas collecting device, and data saved by desktop computer.
Below by way of the technical solution for further illustrating the application for the test to a specific house, referring to FIG. 4,
It illustrates the structural schematic diagrams in a house.
Referring to FIG. 4, disposing test equipment in house 100 when specific test, placed at A, B, C, D respectively online
Formula sulfur hexafluoride gas transmitter (on-line detector), in house, central point (at E) places desk-top sulfur hexafluoride detector.
Step S120 keeps the indoor closed environment in measured house, discharges search gas indoors, and make the tracer
Gas uniformly diffuses to the inner space in entire measured house.
The interior closed environment is a relatively closed environment, i.e. the door and window in closing house and other ventilations
Equipment etc. forms a relatively closed environment, and the closed loop in house is also kept during measuring gas concentration and decaying
Border.For example, the survey crew in measurement process in house can not go out when using the measuring instrument of observation concentration variation within doors
Enter house, forbids the gas diffusion in house to the behavior of outdoor environment.
After discharging search gas indoors, with the diffusion of search gas indoors, the survey of each test point is set
Test instrument starts the concentration for testing the search gas of the position respectively.It may determine that by the concentration determination data of each test point
Whether search gas uniformly diffuses to inside entire house.For example, test equipment is arranged in three test points inside house, to
In the case that the concentration deviation of the search gas of three test points is less than threshold value, time t1 is recorded.It is with the time t1
The test start time point of gas exchange rate E is tested, until terminating house when the concentration of search gas drops to preset value in house
The test of gas exchange rate E.Wherein, the setting of threshold value can be with according to the release concentration of specific house size and search gas
Flexible setting is generally arranged at 10% or so.
The sulfur hexafluoride gas that the preferred purity of search gas is 99.99%.Sulfur hexafluoride is a kind of colourless, tasteless, odorless
, there is inert non-flammability gas.Its physical activity is big, can mix rapidly in the air of disturbance and equably divide
Cloth is in detection space, and not soluble in water, no sedimentation, non-condensing, is not adsorbed by substances such as soil in exhibition room, has very strongization
Learn stability.Therefore instrument has preferable selectivity and high sensitivity to it, ensure that the accuracy of test data.Separately
Outside, the characteristic quickly spread using sulfur hexafluoride gas, for house of taking refuge, the diffusion rate of common toxic gas is low
In sulfur hexafluoride gas, therefore, the time that toxic gas diffuses into house of taking refuge is longer, and sulfur hexafluoride gas is selected to measure
Effectively taking refuge the time for what data were calculated take refuge house, can be used as the safety time reference standard of rescue personnel.
Such as the house 100 in attached drawing 4, after completing arrangement instrument, according to the volume (can be evaluated whether) in house 100,
Tester uses the steel cylinder equipped with pressure reducing valve to discharge suitable sulfur hexafluoride gas.Door is shut, the closed loop in house 100 is kept
Border, can using fan blow air help house 100 in sulfur hexafluoride gas mixing, each 1min A, B, C, D at oneself
It is dynamic to measure and record concentration data.Sulfur hexafluoride detector test at A, B, C, D acquires concentration data, until house 100
Interior gas mixing uniformly (concentration deviation everywhere is less than 10%), and records time t1.
Step S130, the concentration value of the time point search gas corresponding with time point when record measures.
This step is judging that search gas uniformly diffuses to the inside in entire measured house after executing step 120
It is carried out behind space.For example, starting to execute this step as starting point using time t1.Due to expansion of the search gas inside house 100
Also a small amount of search gas and outdoor environment 200 are had during dissipating and carries out gas exchanges, this step is in specific execute, with step
The rapid 120 time t1 determined are starting point, and each test point records the concentration variation of the search gas after t1 starting point simultaneously, i.e.,
The concentration value of the time point search gas corresponding with time point when measurement is recorded simultaneously.
It is illustrated by taking the house in Fig. 4 as an example, stops being passed through six after the concentration value 1400-1800ppm of four points acquisition
Sulfur fluoride gas determines starting point t1 after the concentration deviation of four points detection is less than 10%.Using t1 as starting point, four acquisitions
Point record data, stop test, and experimental result is saved, instrument and equipment when the concentration value of record drops to about 300ppm
It withdraws.Forbid gas inside and outside all artificial houses to exchange in experimentation, keeps the closed environment in house 100.
It is shown in Table 1, is the data that the moiety concentrations value acquired under conditions of temperature is 10 DEG C changes over time.2 are shown in Table,
The data that the moiety concentrations value acquired under conditions of being 13 DEG C for temperature changes over time.
| Time (min) | Concentration C (ppm) | Concentration LnC (ppm) |
| 190 | 901 | 6.85 |
| 200 | 824 | 6.76 |
| 210 | 732 | 6.64 |
| 220 | 689 | 6.58 |
| 230 | 594 | 6.43 |
Table 1
| Time (min) | Concentration C (ppm) | Concentration LnC (ppm) |
| 270 | 1121 | 7.07 |
| 280 | 1046 | 7.0 |
| 290 | 976 | 6.93 |
| 300 | 919 | 6.87 |
| 310 | 875 | 6.82 |
Table 2
Step S140 changes with time according to the concentration value of the search gas, determines gas exchange rate E.
In the present embodiment, processing is fitted using concentration data and time data of the simple regression method to test, is obtained
Obtain gas exchange rate E.
Specifically, to E=Vin/ V=-Ln { (Ca-CB, 1)/(Ca-Cb,0) carry out linear change processing, wherein Cb,0To show
The beginning concentration of track gas, Cb,1Unitary for the concentration of the search gas after 1 minute, the concentration and time t that obtain search gas returns
Return equation: i.e. InC=A+E*t, wherein InC is the natural logrithm value of gas concentration, and A is constant, and E is gas exchange rate, when t is
Between (min).
The time point search gas corresponding with time point when later, according to the measurement recorded in step S130
Concentration value, using simple regression method obtain gas exchange rate E.
Fig. 5 and Fig. 6 is please referred to, it illustrates the fitting knots of concentration data and time data under condition of different temperatures
Fruit.
Wherein, the temperature of the outdoor environment 200 of Fig. 5 test is 10 DEG C, and the temperature of the outdoor environment 200 of Fig. 6 test is 13
℃.The ordinate of Fig. 5 and Fig. 6 is the natural logrithm value of concentration, and abscissa is time value.
The gas exchange rate E obtained respectively under the test temperature of Fig. 5 and Fig. 6 see the table below 3:
Table 3
In order to guarantee the accurate of test data, before discharging search gas, the indoor ring in measured house can also be measured
The background value in border, correspondingly, deducting different background values to measurement when carrying out the test of gas exchange rate E at different temperatures
The influence of data reduces the systematic error of test data.
Step S200 carries out data fitting according to the corresponding relationship of temperature value obtained and gas exchange rate E.
After gas exchange rate E at a temperature of use step S100 obtains a certain outdoor environment 200, in different rooms
Under the conditions of the temperature of external environment 200, repeat step S100, at least carries out four tests, obtain and outdoor environment 200 respectively
The corresponding gas exchange rate E of temperature, later carry out data fitting.
According to At=E/D=E/ (a*T3/2) carry out data processing obtain porosity area At before, wherein T be Kelvin temperature
Degree, therefore need to convert the temperature value of the outdoor environment 200 of acquisition.
Four tests have been carried out in 0 DEG C, 10 DEG C, 13 DEG C, 20 DEG C respectively in this embodiment, have now been summarized as follows result:
| Temperature (DEG C) | T3/2(103K3/2) | E |
| 0 | 4.5107 | 0.8161 |
| 10 | 4.760797 | 0.8315 |
| 13 | 4.836699 | 0.8751 |
| 20 | 5.015352 | 0.8862 |
Step S300 determines porosity equivalent aera At according to the data fitting result.
After the data processing of step S200, the straight slope of acquisition is as porosity equivalent aera At.
Referring to FIG. 7, it illustrates the fitting results of porosity equivalent aera At.Ordinate is gas exchange rate in Fig. 7
E, abscissa are Kelvin T3/2。
Simple regression method is used when carrying out the fitting of porosity equivalent aera At, using the straight slope of acquisition as hole
Spend equivalent aera At.The At=0.1782 in house 100 is obtained as calculated in Fig. 7.Referring to FIG. 8, it is mentioned for the embodiment of the present application
The method flow diagram using house porosity equivalent aera At supplied.
The present embodiment provides it is a kind of using porosity equivalent aera At measurement house gas exchange rate method, below in conjunction with
Attached drawing is explained, this method comprises:
Step S100 obtains the porosity equivalent aera At in house.
The meaning of At introducing in the above-described embodiments in this step, porosity equivalent aera At be applicant from
A kind of index of definition, for characterizing the floor space passed through when gas diffusion enters house.
Applicant is corresponding with the Air-cleaning technique E of outside air and outdoor temperature T foundation by that will evaluate measured house
Relationship, to provide the operable method of determining porosity equivalent aera At a kind of.This method is in the above-described embodiments
It is discussed in detail, specifically please refers to above content, it will not be described here.
In addition, when due to carrying out gas exchanges between outdoor environment 200 and house 100, under different air pressure conditions, poison gas
The time for diffusing into house of taking refuge is not also identical, accordingly it is also possible to establish model by air pressure and Air-cleaning technique, passes through survey
The Air-cleaning technique under different air pressure conditions is measured, and then obtains porosity equivalent aera At.
By taking the house in Fig. 4 as an example, referring to FIG. 7, obtaining the porosity equivalent aera At=0.1782 in house 100.
Step S200 obtains the outdoor temp angle value T in the house, wherein handles the outdoor temp angle value T for Kelvin temperature
Two/cube of angle value.
The meaning of outdoor temp angle value T in this step comes from Maxwell-gilliland correlation, is establishing porosity equivalent
When the corresponding relationship of area At and Air-cleaning technique E, pass through E*V*Cb=Q=-D*At* (Ca-Cb) equation, it is obtained by processing
At=E/D=E/ (a*T3/2), since T is thermodynamic temperature in D, therefore need to be by the outdoor temp angle value T processing that this step obtains
Two/cube of K value.
By taking the house in Fig. 4 as an example, if wanting to know outdoor 10 DEG C of Air-cleaning technique E, need to handle 10 DEG C for Kelvin
Two/cube of temperature value, as 4.760797 (units 103K3/2)。
Step S300 obtains institute according to the porosity equivalent aera At and treated outdoor temp angle value T
State the gas exchange rate E in house to be measured.
After obtaining porosity equivalent aera At and outdoor temp angle value T, according to E=At*a*T3/2It can be obtained current
The gas exchange rate E in house.Wherein, a is constant, and diffusate and medium relevant parameter are merged specifically in diffusion coefficient D
The constant of acquisition can be obtained via experiment.
A kind of application scenarios of the present embodiment are under house scene of taking refuge, to use porosity for house scene of taking refuge
The temperature parameter of equivalent aera At combination acquisition outdoor environment 200, the Air-cleaning technique E in house you can learn that this is taken refuge, in turn
The house of taking refuge is obtained for the time that poison gas is taken refuge, is succoured in time convenient for rescue worker.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this field skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification therefore protection of the invention
Range should be subject to the range that the claims in the present invention are defined.
Claims (8)
1. a kind of method of determining house porosity equivalent aera At characterized by comprising
Outside different chamber under conditions of temperature value T, measured house is measured under defined sealing condition, corresponding each temperature value
Gas exchange rate E；
According to the corresponding relationship of temperature value obtained and gas exchange rate E, data fitting is carried out；
According to the data fitting result, porosity equivalent aera At is determined.
2. the method according to claim 1, wherein described under conditions of temperature value T, measure quilt outside different chamber
House is measured under defined sealing condition, the gas exchange rate E of corresponding each temperature value includes:
Test point in measured house places concentration determination instrument；
The indoor closed environment for keeping measured house, discharges search gas, and spread the search gas uniformly indoors
To the inner space in entire measured house；
The concentration value of the time point search gas corresponding with time point when record measurement；
It is changed with time according to the concentration value of the search gas, determines gas exchange rate E.
3. according to the method described in claim 2, it is characterized by further comprising: the test point placement in measured house is dense
When spending test equipment, at least three test points place concentration determination instrument indoors；
In the case that the concentration deviation of search gas to three test points is less than threshold value, time t1 is recorded；
It is the test start time point for testing gas exchange rate E with the time t1, until the concentration of search gas declines in house
When to preset value, terminate the test of house gas exchange rate E.
4. according to the method described in claim 2, it is characterized in that, executing the indoor closed environment for keeping measured house,
Discharge search gas indoors, and make the search gas uniformly diffuse to entire measured house inner space step it
Before, further includes:
Measure the background value of the indoor environment in measured house.
5. test method according to claim 2, which is characterized in that the concentration value according to the search gas is at any time
Between variation, determine gas exchange rate E, specifically: using simple regression method obtain gas exchange rate E.
6. test method according to claim 3, which is characterized in that the search gas is sulfur hexafluoride gas.
7. the method according to claim 1, wherein the temperature value is K value；It is described according to being obtained
The corresponding relationship of the temperature value and gas exchange rate E that obtain, carrying out data fitting includes:
Two/cube of K value is subjected to linear regression processing with the numerical value of corresponding gas exchanges rule E；
Correspondingly, the straight slope that processing is obtained is as porosity equivalent aera At.
8. a kind of method for calculating house gas exchange rate using porosity equivalent aera At characterized by comprising
Obtain the porosity equivalent aera At in house；
Obtain the outdoor temp angle value T in the house, wherein the outdoor temp angle value T is handled two for K value/
Cube；
According to the porosity equivalent aera At and treated outdoor temp angle value T, the house to be measured is obtained
Gas exchange rate E.
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