KR101607831B1 - Method for predicting indoor ventilatiory volume based on radon radiation amount of construction material and apparatus for reducing radon automatically using the same method - Google Patents

Method for predicting indoor ventilatiory volume based on radon radiation amount of construction material and apparatus for reducing radon automatically using the same method Download PDF

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KR101607831B1
KR101607831B1 KR1020150108481A KR20150108481A KR101607831B1 KR 101607831 B1 KR101607831 B1 KR 101607831B1 KR 1020150108481 A KR1020150108481 A KR 1020150108481A KR 20150108481 A KR20150108481 A KR 20150108481A KR 101607831 B1 KR101607831 B1 KR 101607831B1
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radon
concentration
indoor
building material
amount
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KR1020150108481A
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Korean (ko)
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이동현
이철민
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(주)Ehs기술연구소
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/0001Control or safety arrangements for ventilation
    • F24F11/0017
    • F24F11/0086
    • F24F2011/003

Abstract

The present invention relates to a method for predicting an indoor ventilation rate based on a radon emission amount of construction material and an apparatus for automatically reducing radon using the same. The method comprises: a step of substituting a radon emission amount of construction materials in a building in a mathematical prediction model which represents a relationship between the radon emission amount of the construction materials and the minimum indoor ventilation rate of a building; and a step of calculating the minimum indoor ventilation rate to maintain an allowable cumulative exposure effective dose when the indoor air is exposed to radon emitted from the construction materials, from the mathematical prediction model. Therefore, the present invention is capable of predicting the indoor ventilation rate which can eliminate harmful influences on the health of residents due to radon emitted from the construction materials using the minimum indoor ventilation rate.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for predicting indoor airflow based on radon emissions of building materials and a device for automatically reducing radon using the method. the same method}

The present invention relates to a method for predicting the amount of ventilation in a room based on the radon emission amount of a building material and an apparatus for automatically reducing the radon using the method.

Radon is one of the natural radioactive materials including uranium and radium, and it is the main carcinogen that threatens the health of the residents by causing lung cancer by daily exposure from the living environment such as indoor air. The World Health Organization (WHO) and the US Environmental Protection Agency (USEPA) recommend that radon be the major causative agent of lung cancer after smoking and should be managed in indoor air. Radon is present in outdoor air or groundwater, but most of it is occupied by indoor air (about 95%). Radon is generated from the infiltration through the gaps between the buildings and the radium contained in the building materials, Lt; / RTI >

Several interesting studies of people exposed to radon have shown that radon at home and at work presents a serious health risk, and those exposed to long-term, high indoor radon concentrations are at increased risk for pathological effects and respiratory function The risk of developing lung cancer is increased, and this risk is reported to depend on the concentration of indoor radon, the duration of exposure, and the degree of ventilation of the house.

Thus, even though the radon is mainly formed from the soil and rocks of the built house, the radon generated in the building material is also known as one of the main potential sources of radon in the indoor environment. Recently, there has been a growing demand for the management of radon concentration in the indoor air after the report that exposure by radon in the indoor air through the mass media in Korea may cause adverse health effects. Also, as the increase of radon concentration in indoor air of a high - rise apartment building is reported to be caused by building materials, social concern about radon emission of building materials and health hazards thereof is increasing.

Recently, as the importance of Indoor Air Quality (IAQ) has been emphasized, many measures for improving indoor air quality have been proposed and applied. In particular, it is well known that the ventilation of contaminated indoor air is at the forefront of improving indoor air quality. In addition, as a mitigation measure for radon, soil ponding method is the most effective method to reduce indoor radon concentration by releasing radon generated from soil or rock, which is known as main source of radon, And is widely used.

It is known that when the indoor radon concentration is high in the high-rise apartments, the soil-ponding technique is unfamiliar to apply to this building. In these high-density high-rise apartments, the concentration of indoor air is increased by radon emitted from building materials rather than soil And a method of reducing by ventilation is recommended as a method suitable for this high concentration of radon reduction. However, due to the consciousness of energy conservation in recent years, countermeasures against the increase of unplanned ventilation volume are being actively discussed.

The present invention provides a method for predicting indoor ventilation amount based on radon emission amount of a building material so as to calculate an optimum ventilation amount that can bring about health improvement of a resident in consideration of radon emission amount of building material and cumulative annual exposure amount thereof. Another object of the present invention is to provide an apparatus for automatically reducing the radon using the method and a device for displaying the predicted ventilation amount of the room according to the method. Further, the present invention is not limited to the above-described technical problems, and another technical problem may be derived from the following description.

According to an aspect of the present invention, there is provided a method of predicting a ventilation amount of a room based on a radon emission amount of a building material, the method including: receiving a radon emission amount of a building material of a building; Substituting the input radon emission amount into a mathematical prediction model indicating a relationship between a radon emission amount of the building material and a minimum ventilation amount of the interior of the building; And calculating a minimum indoor ventilation amount for maintaining an allowable cumulative exposure effective dose upon exposure to the radon concentration in indoor air by radon emitted from the building material from the mathematical prediction model into which the radon emission amount is substituted , The amount of ventilation in the room that can extinguish the harmful effects of occupant health caused by radon emitted from the building material is predicted by the calculated minimum ventilation amount of the room. The radon emission amount of the building material can be expressed by the concentration of radon emitted from the building material.

Wherein the mathematical prediction model is adapted to calculate the allowable cumulative exposure effective dose based on at least one of a concentration of radon emitted from the building material, a decay constant of radon, an empty volume of the indoor space, a surface area of the indoor space, a surface area of the building material, Wherein the step of substituting the radon emission amount is an inequality that compares the input radon emission amount with the concentration term of the radon among the terms of the mathematical prediction model, Can be substituted.

A method for predicting indoor ventilation based on radon emission of a building material, comprising: calculating an allowable annual cumulative exposure effective dose; Calculating a cumulative exposure effective dose upon exposure to the concentration of radon emitted from the building material; Setting an inequality for comparing the cumulative exposure effective dose at the time of exposure with the allowable cumulative exposure effective dose; And calculating the mathematical prediction model by expressing the inequality expression as an inequality in which the ventilation amount of the room is compared with the allowable cumulative exposure effective dose.

A method for predicting a ventilation amount of a room based on a radon emission amount of the building material includes calculating a working level (WL) representing a total energy emitted by a radon progeny generated from a radon collapse based on the concentration of the radon; Converting the WL into a working level month (WLM) representing a cumulative amount of exposure for one month by radon offspring; Calculating WLM y represents an annual cumulative exposure dose due to the children of radon from the WLM; And calculating the exposure effective dose of radon by applying WL to the WLM y , wherein calculating the acceptable cumulative cumulative exposure effective dose comprises calculating an allowable cumulative exposure effective dose from the exposure effective dose Can be calculated.

A method for predicting a ventilation amount of a room based on a radon emission amount of the building material includes calculating a radon area emission rate of the building material according to a closed chamber method; Calculating a radon concentration of the building material contributing to the indoor radon concentration; And calculating the indoor radon concentration by the concentration of radon emitted from the building material by applying the radon concentration of the building material to the radon area emission rate of the building material, , The cumulative exposure effective dose at the time of exposure to the concentration of radon emitted from the building material can be calculated by applying the exposure effective dose of the radon to the indoor radon concentration.

According to another aspect of the present invention, there is provided an apparatus for automatically reducing radon contained in air by using a method of predicting the amount of ventilation of a room based on the radon emission amount of the building material, A radon sensor for detecting an actual concentration of radon contained in the radon; An exhaust fan for reducing the concentration of radon contained in the indoor air by sucking the air flowing into the indoor space of the building and discharging the air to the upper outer space of the building; And a controller for controlling the operation of the exhaust fan based on the predicted indoor ventilation amount and the actual concentration of the detected radon according to the method of predicting the indoor ventilation amount based on the radon emission amount of the building material.

Wherein the controller calculates the operating time of the exhaust fan based on the amount of ventilation of the room that can eliminate the harmful effects of occupant health due to the actual concentration of the detected radon and the ventilation amount of the predicted room, The operation of the exhaust fan can be turned on so that the exhaust fan sucks the air flowing into the indoor space of the building and discharges it to the upper outer space of the building only for the calculated operation time.

According to another aspect of the present invention, there is provided an apparatus for predicting indoor ventilation amount according to a method for predicting indoor ventilation amount based on radon emission amount of a building material, And outputting data indicative of the predicted ventilation amount of the room according to a method of performing the method; And a user interface for displaying to the user the ventilation amount of the predicted room based on the output data.

Because it reduces the radon by predicting the indoor ventilation amount based on the radon emission of the building material, it can prevent the chronic disease (lung cancer) caused by the resident radon by the proper ventilation amount based on the occupant's cumulative exposure dose of radon due to the radon emission of building material . The operating time of the radon cold was calculated by the ventilation amount of indoor air which can extinguish the harmful effects of the residents health by the actual concentration of radon in the indoor air, The operation of the exhaust fan 30 is performed by turning on the operation of the exhaust fan 30 so that the exhaust fan 30 sucks the air flowing into the indoor space of the building only during the operation time thus calculated and discharges it to the upper external space of the building Not only can energy wastage caused by soil and building materials be minimized, but also can extinguish the harmful effects of overall occupant health by radon released from soil and building materials. Thus, it is possible to prevent the possibility of energy loss due to an increase in vague amount of ventilation to reduce the indoor radon concentration, and to eliminate the distrust of radon reduction by applying appropriate ventilation amount.

By displaying the predicted indoor ventilation amount according to the indoor ventilation prediction method to the user, the occupant can induce the occupant to open and close the window according to the indicated ventilation amount, so that the indoor air such as the exhaust fan can be automatically reduced It is possible not only to extinguish the harmful effects of the residents' health by radon but also to prevent the possibility of energy loss due to an increase in vague ventilation to reduce the indoor radon concentration. In particular, it is possible to provide users with quantitative information on the reduction of the radon concentration in the indoor air of the high-rise apartment and the improvement of the indoor air quality, thereby enabling the quantitative information transmission on the improvement of the indoor air quality.

1 is a block diagram of a radon reduction apparatus according to an embodiment of the present invention.
Fig. 2 is a configuration diagram of the controller 60 shown in Fig.
Figure 3 is a block diagram of an embodiment of the present invention FIG. 2 is a flow chart of a method for predicting indoor air flow rate.
FIG. 4-5 is a flowchart illustrating a calculation process of the mathematical prediction model in step 32 shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Radon concentrations are expressed as either becquerel (Bq) or picocure (pCi). Becquerel is an international standard unit of radioactive material, which indicates the amount of radiation that is emitted once from the nucleus in one second, ie, one radioactive decay occurs for one second. The concentration of radon in air is expressed as Bq / ㎥ or pCi / L, and 1 pCi / L is equivalent to 37 Bq / ㎥. According to the indoor air quality recommendation standard in accordance with Article 6 of the "Act on Indoor Air Quality Control of Multi-use Facilities, etc.", the concentration of radon in the indoor air is recommended to be 148 Bq / ㎥ or less. The embodiments described below relate to a method for predicting indoor ventilation based on radon emission of a building material and an apparatus for automatically reducing the radon using the method. Quot; radon reduction device ".

1 is a block diagram of a radon reduction apparatus according to an embodiment of the present invention. 1, the radon reduction device according to the present embodiment includes an intake pipe 10, a connection pipe 20, an exhaust fan 30, an exhaust pipe 40, a radon sensor 50, and a controller 60 . The intake pipe 10 is positioned below the bottom surface 110 of the building 100 and sucks air flowing into the room of the building 100. 4, the intake pipe 10 may be installed on the ground 120 in a space between the bottom surface 110 of the building 100 and the ground 120. As shown in FIG. The connection pipe 20 connects the intake pipe 10 and the exhaust fan 30. The exhaust fan 30 sucks the air flowing into the indoor space of the building, that is, the air in the intake tube 10, and discharges the air into the outer space above the building, thereby reducing the concentration of radon contained in the indoor air. The exhaust pipe (40) discharges the air discharged from the exhaust fan (30) to the upper external space of the building (100). The radon sensor 50 is installed in a room of the building 100 to detect the actual concentration of radon contained in the air in the room. The controller 60 controls the operation of the exhaust fan 30 based on the actual concentration of radon detected by the radon sensor 50. [

Fig. 2 is a configuration diagram of the controller 60 shown in Fig. 2, the controller 60 is comprised of a processor 61, a storage 62, a user interface 63, and a power supply signal generator 64. [ As shown in FIG. 1, the storage 62 stores a program for predicting the amount of ventilation of the room based on the radon emission amount of the building material. The controller 60 can control the operation of the exhaust fan 30 in accordance with this prediction program by the processor 61 executing the prediction program stored in the storage 122. [ The user interface 63 receives the radon emission amount of the building material of the building from the user and transmits it to the processor 61. The power supply signal generator 64 generates a power supply signal to be supplied from the power supply 200 to the exhaust fan 30 under the control of the controller 60 and supplies the power supply signal to the exhaust fan 30 to drive the exhaust fan 30.

Figure 3 is a block diagram of an embodiment of the present invention FIG. 2 is a flow chart of a method for predicting indoor air flow rate. Referring to FIG. 3, the indoor ventilation amount predicting method according to the present embodiment includes the steps performed by the controller 60 as follows. As shown in FIG. 2, the storage 62 stores a program for predicting the ventilation amount of the indoor space based on the radon emission amount of the building material. The method for predicting the amount of radon reduction ventilation emitted from the building material shown in Fig. 3 can be performed by the controller 60 executing a prediction program stored in the storage 62. Fig.

 In step 31, the controller 60 receives the radon emission amount of the building material through the user interface 63. In step 32, the controller 60 substitutes the radon emission amount input in step 31 into the mathematical prediction model indicating the relationship between the radon emission amount of the building material and the minimum ventilation amount of the interior of the building. In step 33, the controller 60 compares the radon concentration in the indoor air with the radon emitted from the building material from the mathematical prediction model in which the radon emission amount is substituted in step 32. In step 33, Calculate the amount of ventilation. The minimum amount of ventilation in the room can be used to estimate the amount of ventilation in the room that can extinguish the harmful effects of occupant health caused by radon emitted from the building material. According to the present embodiment, the radon emission amount of the building material is represented by the concentration of radon emitted from the building material.

On the other hand, the controller 60 controls the operation of the exhaust fan 30 based on the ventilation amount of the room predicted according to the indoor ventilation amount predicting method shown in FIG. 3 and the actual concentration of the radon detected by the radon sensor 50 . Conventionally, since the operation of the exhaust fan 30 is controlled depending only on the radon concentration detected by the radon sensor 50, it is possible to eliminate the harmful effects of the occupant health caused by the radon emitted from the soil below the building 100 And did not take into account the adverse health effects of residents' health caused by radon released from building materials. Since this embodiment controls the operation of the exhaust fan 30 based on the optimum amount of ventilation for reducing the indoor radon concentration by the radon emitted from the building material and the actual concentration of the radon detected by the radon sensor 50, And the detrimental effects of overall occupant health by radon emitted from building materials.

The controller 60 estimates the amount of indoor air ventilation that can extinguish the harmful effects of the occupant's health due to the actual concentration of radon detected by the radon sensor 50 and the indoor air ventilation predicted according to the indoor air ventilation predicting method shown in FIG. And the exhaust fan 30 sucks the air flowing into the indoor space of the building only during the operation time thus calculated and discharges the exhaust air to the upper outer space of the building 30 are turned on. Accordingly, not only the energy waste due to the operation of the exhaust fan 30 can be minimized, but also the health hazards of the occupant due to the insufficient operation of the exhaust fan 30 can be prevented and the excessive operation of the exhaust fan 30 Noise pollution can be minimized.

Meanwhile, the controller 60 shown in FIG. 2 can be implemented as an apparatus for displaying the predicted ventilation amount of the room according to the indoor ventilation amount predicting method shown in FIG. Such a display device includes a controller 60 for outputting data indicative of the ventilation amount of the room predicted according to the indoor ventilation amount predicting method shown in FIG. 3, and a controller 60 for outputting data indicating the indoor ventilation amount prediction shown in FIG. 3 based on the data output from the controller 60 And a user interface 63 for displaying the ventilation amount of the room predicted according to the method to the user. The controller 60 may determine the amount of indoor air ventilation that can extinguish the harmful effects of occupant health due to the average concentration of radon emitted from the soil under the resident building 100, It is possible to output data representing the amount of ventilation in which the predicted ventilation amount of the room is summed.

The occupant may extinguish the harmful effects of occupant health by radon by opening the window in accordance with the amount of ventilation indicated in the user interface 63. It is possible to eliminate the harmful effects of the occupant's health by the radon at a very low cost without the facility for automatically reducing the radon in the room air such as the exhaust fan 30 but the occupant can not open the window according to the amount of ventilation indicated on the user interface 63 It has a disadvantage that it is cumbersome. The concentration of radon in the indoor air of a high-rise apartment is due to the radon emitted from the building material because it is far from the earth. The quantitative information on the reduction of the indoor air and the improvement of the indoor air quality in the indoor air of the high- This enables quantitative information on improvement of indoor air quality.

FIG. 4-5 is a flowchart illustrating a calculation process of the mathematical prediction model in step 32 shown in FIG. Referring to FIGS. 4-5, the calculation process of the mathematical prediction model according to the present embodiment includes the following steps. The controller 60 may calculate and store the mathematical prediction model of 32 steps in the storage 62 by performing these steps and the other computer may calculate these mathematical prediction models in step 32 by performing these steps in advance, . In the following, these steps are assumed to be performed by the controller 60, but may be performed by another computer.

In step 41, the controller 60 calculates the radon area emission rate of the building material according to the closed chamber method. The closed chamber method refers to the method of placing the building material in a closed chamber and measuring the concentration of radon emitted from the building material. The calculation of the building material radon emission using the alpha-ray detector in the closed chamber method can be expressed by the following equation (1). Here, "E A" is the area release rate means (mBq / m 2 h), and "C Rne" is the total surface area of the mean cumulative radon emissions and, "A" is radon is emitted building material samples (m 2 ), the mean and, "V" refers to the void volume (m 3) of the sealed chamber and, "M" refers to the mass (kg) of the building material samples, "λ" is the collapse of the radon constant (h - 1 ), and "T" means time (h) after collapse.

Figure 112015074495492-pat00001

In step 42, the controller 60 calculates the radon concentration of the building material contributing to the indoor radon concentration from the radon area emission rate of the building material calculated in step 41. [ As shown in Equation (1), the concentration of radon emitted from the building material on the radon concentration in the indoor air can be derived as shown in Equation (2) based on the water index knowledge. Here, "C Rni" means a radon concentration of building material that contributes to indoor radon, and "E A" refers to the area release rate (mBq / m 2 h) and, "V r" is the room volume (m 3 ), and "λ v " means the ventilation rate (h -1 ) of the indoor air. In the meantime, the exposure effective dose due to the radon concentration of residents when the radon is discharged from the building material calculated in Equation (2) and exposed to the radon concentration present in the room air is calculated by the following formula Can be expressed as.

Figure 112015074495492-pat00002

In step 43, the controller 60 calculates a working level (WL) representing the total energy emitted by the radon progeny generated from the radon collapse based on the radon concentration. The calculation of the radon offspring dose WL based on the radon concentration in various living spaces can be expressed as shown in Equation (1). WL represents the total energy of alpha radiation emitted when the radon and radon progeny (radionuclides) reach the radiation equilibrium when the radon concentration in the air is 100 pCi / L (3700 Bq / m 3 ) Thus, it is possible to calculate the dose of radiation exposure by radon. Here, "F t " means the equilibrium factor value between indoor radon and radon progeny, and "C Rni " means average radon concentration.

Figure 112015074495492-pat00003

In step 44, the controller 60 converts the WL calculated in step 43 into WLM (Working Level Month) representing the cumulative amount of exposure for one month by Radon offspring. As shown in the following Equation 4, WL is calculated by converting the amount of exposure accumulated for 170 hours in a concentration atmosphere of 1 WL to 1 WLM (Working Level Month) by accumulating accumulated WL for one month by the radon offspring It can be converted into WLM representing the amount of exposure.

Figure 112015074495492-pat00004

In step 45, the controller 60 calculates WLM y , which represents the cumulative exposure dose due to radon offspring from the WLM calculated in step 44. This is expressed by Equation (5).

Figure 112015074495492-pat00005

In step 46, the controller 60 calculates the exposure effective dose of the radon by applying WL calculated in step 43 to the cumulative exposure dose WLM y calculated in step 45. On the other hand, the annual effective dose can be finally calculated by using the dose conversion factor at the cumulative exposure dose WLM y calculated at step 45. Using the equation (3), which is a prediction equation of the indoor air radon concentration by the radon concentration emitted from the building material calculated from the above-mentioned effective dose calculation contents and the predicted model of the indoor radon concentration using the building material radon emission amount given in the above equation The exposure effective dose of radon can be expressed as Equation (6).

Here, "C Rni " means the radon concentration (Bq / m 3 ) of the building material contributing to the indoor radon, "n" means the fraction of time spent in the room, "F t &&Quot; 8760 " means the number of hours for one year, and "170" means the working time for one month. The equilibrium constant "F t " was selected as 0.4 considering that the present invention is based on the values provided by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) .

Figure 112015074495492-pat00006

According to the report of the United Nations Radiation Effects Research Committee, it is estimated that about 85 to 90% of the indoor radon concentration is caused by the cracks and cracks in the floor of the building, 5%, and less than 1% due to emissions from groundwater. However, recent reports show that radon concentration in indoor air exceeds the standard in high-rise apartments in Korea and that these apartments do not increase the radon concentration due to the origin of the radon in the soil or groundwater. It is known to be caused by radon generated. Assuming now that both the domestic and the US Environmental Protection Agency's contribution of radon concentration in the building material to the recommended indoor concentration of 148 Bq / m 3 of indoor radon concentration contribute, the allowable annual cumulative exposure effective dose can be maintained The amount of ventilation required to maintain the indoor radon concentration can be predicted.

In step 47, the controller 60 calculates an allowable annual cumulative exposure effective dose from the exposure effective dose of the radon calculated in step 46. [ The allowable annual cumulative exposure effective dose is calculated by setting the term "C Rni " of the radon concentration in terms of the expression 6 of the exposure effective dose calculated in step 46 to the current standard of 148 Bq / m 3 according to the residence time . Here, "t" means the time when the occupant resides indoors on average on a day.

Figure 112015074495492-pat00007

In step 48, the controller 60 calculates the indoor radon concentration based on the radon concentration emitted from the building material by applying the radon concentration of the building material calculated in step 42 to the radon area emission rate of the building material calculated in step 41 . This can be expressed by the following equation (8). Equation (8) is a prediction model of the indoor radon concentration based on the radon concentration emitted from the building material by substituting Equation (1) into Equation (2). Here, "C Rni " means the radon concentration in the room air (Bq / m 3 ) and "C Rne " means the radon concentration (Bq / m 3 ) emitted from the building material.

Figure 112015074495492-pat00008

In step 409, the controller 60 calculates the cumulative exposure effective dose at the time of exposure to the concentration of radon emitted from the building material by applying the exposure effective dose of the radon calculated in step 46 to the indoor radon concentration calculated in step 48 . This can be expressed by the following equation (9). Equation (9) can be regarded as a maximum exposure effective dose prediction model at the time of exposure to the radon concentration in indoor air discharged from the building material, and can be calculated by substituting Equation (8) into Equation (6). Here, the radiation balance factor "F t " is set to 0.4, and the indoor residence fraction "n" is converted into a function of the residence time "t "

Figure 112015074495492-pat00009

In step 410, the controller 60 sets an inequality that compares the cumulative exposure effective dose at the time of exposure calculated in step 49 with the allowable cumulative exposure effective dose calculated in step 47. [ This can be expressed by the following equation (10). Equation (10) represents the relationship between the cumulative exposure effective dose that should not be exceeded when the indoor radon concentration emitted from the building material is obtained by substituting Equation (7) into Equation (9).

Figure 112015074495492-pat00010

In step 411, the controller 60 expresses the inequality set in step 410 as an inequality in which the ventilation amount "? V " of the room is compared with the allowable cumulative exposure effective dose calculated in step 47, And the minimum ventilation amount of the ventilator. Finally, by summarizing Equation 10 in terms of indoor air volume "λ v ", it is possible to predict the amount of ventilation to maintain the cumulative exposure effective dose in the permissible standard for exposure to radon in indoor air by radon emitted from building materials The mathematical prediction model can be derived by the following equation (11).

Figure 112015074495492-pat00011

As described above, the mathematical prediction model calculates the allowable cumulative exposure effective dose calculated in step 47 from the concentration of radon emitted from the building material, the decay constant of radon, the empty volume of the indoor space, the surface area of the indoor space, The volume of space, and the time since the radon collapse. In step 32, the controller 60 assigns the radon emission amount of the building material input through the user interface 63 to the concentration term "C Rne " of the radon in the items of the mathematical prediction model, that is, do. In addition to the radon concentration term "C Rne ", the controller 60 also calculates the remaining radon concentration, such as the decay constant of radon, the empty volume of the interior space, the surface area of the interior space, the surface area of the building material, The minimum ventilation amount of the room is output from the equation (11).

 The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10 ... intake tube
20 ... connector
30 ... exhaust fan
40 ... exhaust pipe
50 ... Radon sensor
60 ... controller
61 ... processor
62 ... storage
63 ... User Interface
64 ... power signal generator

Claims (9)

  1. A method for predicting indoor ventilation based on radon emissions of building materials,
    Receiving a radon emission amount of the building material of the building;
    Substituting the input radon emission amount into a mathematical prediction model indicating a relationship between a radon emission amount of the building material and a minimum ventilation amount of the interior of the building; And
    Calculating a minimum indoor ventilation amount for maintaining an allowable cumulative exposure effective dose upon exposure to the radon concentration in indoor air by radon emitted from the building material from the mathematical predictive model to which the radon emission amount is substituted,
    The amount of ventilation in the room, which can extinguish the harmful effects of the residents' health caused by the radon emitted from the building material, is predicted by the calculated minimum ventilation amount of the room,
    The radon emission amount of the building material is represented by the concentration of radon emitted from the building material,
    Wherein the mathematical prediction model is adapted to calculate the allowable cumulative exposure effective dose based on at least one of a concentration of radon emitted from the building material, a decay constant of radon, an empty volume of the indoor space, a surface area of the indoor space, a surface area of the building material, And the time after the radon collapse, and the ventilation amount of the room,
    Wherein the step of substituting the radon emission amount is to substitute the inputted radon emission amount into the concentration term of the radon among the terms of the mathematical prediction model.
  2. delete
  3. delete
  4. The method according to claim 1,
    Calculating an allowable annual cumulative exposure effective dose;
    Calculating a cumulative exposure effective dose upon exposure to the concentration of radon emitted from the building material;
    Setting an inequality for comparing the cumulative exposure effective dose at the time of exposure with the allowable cumulative exposure effective dose;
    Further comprising the step of calculating the mathematical prediction model by expressing the inequality expression by an inequality in which the ventilation amount of the room is compared with the allowable cumulative exposure effective dose.
  5. 5. The method of claim 4,
    Calculating a working level (WL) representing total energy released by the radon progeny resulting from the radon collapse based on the concentration of the radon;
    Converting the WL into a working level month (WLM) representing a cumulative amount of exposure for one month by radon offspring;
    Calculating WLM y represents an annual cumulative exposure dose due to the children of radon from the WLM; And
    Further comprising calculating the exposure effective dose of radon by applying the WL to the WLM y ,
    Wherein calculating the acceptable annual cumulative exposure effective dose calculates an acceptable cumulative annual cumulative exposure effective dose from the exposure effective dose.
  6. 6. The method of claim 5,
    Calculating a radon area release rate of the building material according to a closed chamber method;
    Calculating a radon concentration of the building material contributing to the indoor radon concentration; And
    Further comprising the step of calculating the indoor radon concentration by the concentration of radon emitted from the building material by applying the radon concentration of the building material to the radon area emission rate of the building material,
    The step of calculating the cumulative exposure effective dose at the time of exposure may include calculating the cumulative exposure effective dose at the time of exposure to the concentration of radon emitted from the building material by applying the exposure effective dose of the radon to the indoor radon concentration Of the indoor air volume.
  7. An apparatus for automatically reducing radon contained in air in a room using the method of claim 1,
    A radon sensor installed in the interior of the building for detecting an actual concentration of radon contained in the air in the room;
    An exhaust fan for reducing the concentration of radon contained in the indoor air by sucking the air flowing into the indoor space of the building and discharging the air to the upper outer space of the building; And
    And a controller for controlling the operation of the exhaust fan based on the predicted indoor ventilation amount according to the method of claim 1 and the actual concentration of the detected radon.
  8. 8. The method of claim 7,
    Wherein the controller calculates the operating time of the exhaust fan based on the amount of ventilation of the room that can eliminate the harmful effects of occupant health due to the actual concentration of the detected radon and the ventilation amount of the predicted room, And the operation of the exhaust fan is turned on so that the exhaust fan sucks the air flowing into the indoor space of the building only for the calculated operation time, and discharges the exhaust air to the upper external space of the building.
  9. An apparatus for indicating the predicted ventilation amount of a room according to the method of claim 1,
    A controller for outputting data indicative of the predicted ventilation amount of the room according to the method of claim 1; And
    And a user interface for displaying the predicted ventilation amount of the room to a user based on the output data.
KR1020150108481A 2015-07-31 2015-07-31 Method for predicting indoor ventilatiory volume based on radon radiation amount of construction material and apparatus for reducing radon automatically using the same method KR101607831B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004278937A (en) * 2003-03-17 2004-10-07 Rinnai Corp Indoor ventilation system
KR101446285B1 (en) * 2013-04-03 2014-10-06 한일원자력(주) System for realtime measuring radon gas and improving indoor environment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004278937A (en) * 2003-03-17 2004-10-07 Rinnai Corp Indoor ventilation system
KR101446285B1 (en) * 2013-04-03 2014-10-06 한일원자력(주) System for realtime measuring radon gas and improving indoor environment

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