구획모델을 이용한 주택에서 이산화질소의 발생강도 및 감소상수 동시 추정
Estimation of Source Strength and Deposition Constant of Nitrogen Dioxide Using Compartment Model
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Abstract
Indoor air quality might be affected by source strength of indoor pollutants, ventilation rate, decay rate, outdoor level, and so on. Although technologies measuring these factors exist directly, direct measurements of all factors are not always practical in most field studies. The purpose of this study was to develop an alternative method to estimate the source strength and deposition constant by application of multiple measurements. For the total duration of 60 days, indoor and outdoor NO2 concentrations every 3 days were measured in 30 houses in Seoul, Asan and Daegu. Using a compartment model by mass balance and linear regression analysis, penetration factor (ventilation divided by sum of air exchange rate and deposition constant) and source strength factor (emission rate divided by sum of air exchange rate and deposition constant) were calculated. Subsequently, the source strength and deposition constant were estimated. Natural ventilation was 1.80?±?0.42 ACH, 1.11?±?0.50 ACH, 0.92?±?0.26 ACH in Seoul, Asan and Daegu, respectively. Calculated deposition constant(K) and source strength of NO2 in this study were 0.98?±?0.28 hr-1 and 16.28?±?7.47 ppb/h, respectively.
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