WIND TUNNEL TEST ON SURFACE WIND PRESSURE AND PREDICTION OF AIR CHANGE RATE OF DETACHED HOUSE : Experimental study on natural ventilation of detached House Part 1

赤林, 伸一; 村上, 周三; 水谷, 国男; 高倉, 秀一

doi:10.3130/aija.59.9_2

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…The air exchange rate λ e (h −1 ) was calculated using equation (4), which was derived using data from a previous study (Akabayashi et al 1994). This equation can apply to the situation in which all the windows and doors of a building are closed:…”

Section: Air Exchange Ratementioning

confidence: 99%

“…where K is the gross building coverage ratio (%), U is the wind speed (m s −1 ) at a height of 10 m, and S is the leakage area normalised by the floor area (cm 2 m −2 ). In this study, the temperature differential between the outdoor and indoor environments was not taken into account because the influence of the temperature difference on the air exchange rate is small, although Akabayashi et al (1994) considered the temperature difference.…”

Section: Air Exchange Ratementioning

confidence: 99%

“…Although the reduction factor can be calculated using the indoor and outdoor concentrations from the compartment model, it cannot avoid the influence of uncertainty and variability included in these relevant parameters. Moreover, the air exchange rate differs depending on the wind speed, the leakage area normalised by the floor area (referred to as the normalised leakage area), and the gross building coverage ratio (Akabayashi et al 1994). Here, the leakage area is defined as the total area of gaps in a house, and the gross building coverage ratio is defined by the ratio of the building area to the land area, including roads, within 30 m of a target house.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Uncertainty and sensitivity analyses for the reduction factor of sheltering for radiation exposures

Hirouchi¹,

Takahara²,

Komagamine³

2022

J. Radiol. Prot.

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Sheltering is one of the countermeasures used to mitigate radiation exposure during nuclear power plant accidents. The effectiveness of sheltering for inhalation exposure is often expressed by the reduction factor, which is defined as the ratio of the indoor to the outdoor cumulative radioactivity concentrations or doses. The indoor concentration is mainly controlled by the air exchange rate, penetration factor, and indoor deposition rate. Meanwhile, the air exchange rate depends on surrounding environmental conditions: the wind speed, leakage area normalized by the floor area of the house, and gross building coverage ratio. In this study, the ranges of the uncertainty of the reduction factors for particles and iodine in reactive gas form were investigated under various environmental conditions, and sensitivity analyses were conducted to understand the parameter with the most influence on the uncertainty of the reduction factor. From the results of the uncertainty analyses, the calculated reduction factor was highly variable depending on the environmental condition and the airtightness of the houses. The median and 95th percentile of the reduction factors for the older houses were 0.5 and 0.9 for particles and 0.07 and 0.4 for iodine in reactive gas form, respectively and these ranges were smaller for newer houses. From the results of the sensitivity analyses, the wind speed was the most influential parameter determining the reduction factor. Additionally, the wind speed was less influential for the reduction factor in newer houses.

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Section: Air Exchange Ratementioning

confidence: 99%

Section: Air Exchange Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Uncertainty and sensitivity analyses for the reduction factor of sheltering for radiation exposures

Hirouchi¹,

Takahara²,

Komagamine³

2022

J. Radiol. Prot.

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Multipoint measurement method for air temperature in outdoor spaces and application to microclimate and passive cooling studies for a house

Lee

Asawa

Kawai

et al. 2017

Building and Environment

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Study on the Evaluation of Cross Ventilation Performance Considering Distribution of Indoor Airflow Velocity

Akabayashi¹,

Shen²,

Hosono³

et al. 2008

Nihon Kenchiku Gakkai Kankyokei Ronbunshu

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The distribution of indoor airflow velocity by cross ventilation is influenced by the regional climate conditions, and the location as well as the shape of the building. In this study, CVDHI B , CVDHI P and CVDHI T of Cross Ventilation Degree (1) The ratio of averaged CVDHI P and CVDHI B values is about 1: 20 in Tokyo and Niigata.(2) The CVDHI values increases when an opening is placed on an opposite wall in a straight line, and placed at the corner of the room.Prof.,

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WIND TUNNEL TEST ON SURFACE WIND PRESSURE AND PREDICTION OF AIR CHANGE RATE OF DETACHED HOUSE : Experimental study on natural ventilation of detached House Part 1

Cited by 8 publications

References 1 publication

Uncertainty and sensitivity analyses for the reduction factor of sheltering for radiation exposures

Uncertainty and sensitivity analyses for the reduction factor of sheltering for radiation exposures

Multipoint measurement method for air temperature in outdoor spaces and application to microclimate and passive cooling studies for a house

Study on the Evaluation of Cross Ventilation Performance Considering Distribution of Indoor Airflow Velocity

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