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여름정기학술대회

2022여름초록

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Temporal variations of VOC emissions with proton transfer reaction time-of-light mass spectrometer inside the cabin of a new electric mini truck under different operation modes

작성자
Berkay Yesildagli

발표자 및 발표 내용

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발표구분
포스터발표
Biological & Environment
Brief Oral Presentation 발표신청
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주저자

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Berkay Yesildagli
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한국과학기술연구원
국가

공동저자

공동저자
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국가
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국가
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국가
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국가
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국가
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국가
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국가

접수자

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이지원
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한국과학기술연구원

People spend the most of their time in vehicles today due to traffic congestions, occupational reasons and travelling. Volatile organic compounds (VOC) are constantly emitted from the vehicle cabin materials such as plastic, glass, sealants, foam, and upholstery. Considering the cabins are smaller environments in comparison to other indoor spaces, the emission density would be higher in contrast. Therefore, it is essential to measure these emissions to better understand their health effects.

In the last decade, the market share of electric vehicles (EV) has been increasing dramatically due to environmental response and advancement in the proprietary technology. Since EVs work without a combustion engine, the VOC emissions related to exhaust inside the cabin are expected to be reduced significantly. However, cabin material emissions are still present without the background noise of exhaust emissions. Meanwhile, most of the published studies focused on the exhaust emissions in the cabin and lack to address how the transient emissions occur, and in which events, such as ventilation and temperature changes, the emissions are affected. These gaps are due to the low time resolution and instrumental sensitivity.

To better understand how the cabin VOC emissions change, we for the first time have conducted the measurements inside the cabin of a new EV mini truck with a proton transfer reaction time-of-light mass spectrometer (PTR-ToF-MS) under different operational scenarios such as engine off and on, ventilation off and on, circulation of and on, and heater off and on, on several different days. PTR-ToF-MS, compared to others, has on-line sampling and time resolution, and is more sensitive for detection than other instruments. From these measurements, we have acquired temporal change of 246 compounds from cabin and ambient air. Among them 83 of the compounds are identified. The cabin consisted of higher share of CxHy compounds, in comparison to ambient measurements (32.76% and 20.49%, respectively). Meanwhile, ambient air consisted of higher share of CxHyOz compounds than cabin measurements (71.22% and 51.97%, respectively). The emissions inside the cabin are in linear relation with the temperature increase caused by the natural solar light (r = 0.99, p > 0.05). Meanwhile, same relationship is not found in the ambient measurements. (r = 0, p > 0.05). When the heater inside the cabin operated at 27 , the emissions increased far more than the solar exposure test between 09:00 and 14:00 (70.93% and 56.83%, respectively). Therefore, it is judged that the cabin emissions in vehicles are related to temperature increase.

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