| Project/Area Number |
15206066
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Architectural environment/equipment
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| Research Institution | Chiba Institute of Technology |
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Principal Investigator |
KOMINE Hiromi Chiba Institute, of Technology, Faculty of Eng., Dept. of Architecture & Civil Eng., Prof., Dr. Eng, 工学部, 教授 (20114481)
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| Co-Investigator(Kenkyū-buntansha) |
TANIAI Tetsuyuki Chiba Institute, of Technology, Faculty of Eng., Lecturer, Dr. Eng, 工学部, 講師 (20348361)
木村 洋 (株)長谷工コーポレーション技術研究所, チーフエンジニア
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥28,080,000 (Direct Cost: ¥21,600,000、Indirect Cost: ¥6,480,000)
Fiscal Year 2005: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2004: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Fiscal Year 2003: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000)
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| Keywords | volatile organic compounds / formaldehyde (HCHO) / indoor air quality / double exponential formula / HBF equation / chamber method / emission rate / environmental factor / 揮発性有機化合物(VOCs) / HCHO濃度予測式 / 測定方法 / 吸着 |
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| Research Abstract |
In order to keep the indoor air quality in acceptable levels, it is important to predict the concentrations of chemical substances in newly-constructed houses, to estimate the emission rate decay of chemical substances from building materials, and to predict the curing period. This study aims to establish the prediction method of VOCs concentration in indoor air environment on the basis of the VOCs emission rates from building materials, measured by the test chamber method under several different ambient conditions related with actual living environments in just finished houses.
The results are summarized as follows ;
1)A model test was conducted on a simple HCHO emission material under the condition in which air change rate, loading factor, temperature, and relative humidity simulates the actual environment, and the HCHO concentration prediction model based on the HCHO emission rates prediction model by the small chamber method was verified.
2)Temperature, relative humidity, and N/L were
… More
systematically changed under the condition in which several different wood-based panels coexist, and the HCHO concentration prediction model based on the HCHO emission rates prediction model of a simple material was verified.
3)The long-term semi-outdoor exposure test on formaldehyde concentration in test chamber in which several different wood-based panels were placed, is clarified that this model is possible to estimate the concentration decay under temperature and relative humidity fluctuations. The curing period to satisfy the indoor air quality in acceptable levels can be predicted according to these models and the emission coefficients calculated from measured emission rate.
4)The influence of the environmental factors on the toluene emission rate from the paint is investigated. The temperature has small influence on the toluene emission behavior during the emission process under internal diffusion control although the temperature has a great influence on the toluene emission behavior during emission process under the evaporation control. The decrement of toluene emission rate is modeled as a double exponential formula and a simplified estimation method is presented.
5)The emission characteristics of formaldehyde and toluene were verified under the condition that both the formaldehyde emission from building materials and the toluene emission from the paint were occurred in the same test chamber. The result showed that the toluene emission characteristics were not influenced by the coexistence of two materials, although the formaldehyde emission characteristics fluctuated for about five days due to the absorption and the re-emission on the paint film. The measurement of indoor formaldehyde concentration immediately after the completion involve the danger of misjudging the concentration because the paint coats will not dry fully and those will be possible to absorb formaldehyde. Less
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