표준기상데이터 작성 시 누락된 풍속 데이터의 보간 방법 제안

박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.11

급배기 교번식 축열회수 환기시스템의 열교환효율 평가방법 제안

박소우(So Woo Park),남정화(Jung Hwa Nam),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

Recently, with the growing interest in ventilation systems, a new type of ventilation system that improves installability, energy efficiency, and controllability has been developed and applied. In particular, Bidirectional Ventilation System(BVS), the air supply and exhaust are alternately operated in a single-duct system, is applied in these days. Also, the duct internal air temperature and the air flow rate varies with time. As results the heat exchange efficiency changes with time. KS B 6879 provides a method for measuring the heat exchange efficiency of a heat recovery ventilation system. This standard is established for a dual duct ventilation system, which is capable of measuring the supply air temperature, the return air temperature simultaneously. Therefore, KS B 6879 method is difficult to apply to the Bidirectional Ventilation System. The aim of this study is to analyze the heat exchange characteristics of the Bidirectional Ventilation System and explains the characteristics of temperature and airflow variation. Finally, a method for evaluating the heat exchange efficiency of Bidirectional Ventilation System will be suggested.

건물 기밀성능에 따른 미세먼지 실내 유입 특성 분석

박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11

The university classroom is one of the most vulnerable places for high density particulate matter(PM). University classroom is often enclosed for blocking the ambient noise during the class, more than 1 hour, and almost university buildings do not have a ventilation system or air purification system. In addition, the number of students per classroom in university is higher than other space. As a result, PM concentration in the classroom can be higher than the domestic standard. The purpose of this study is to investigate the relation between the factors affecting the PM concentration in the university classroom by long-term field measurement. Indoor PM concentration will be measured in three classrooms and outdoor PM will be measured on the roof of the building. Factors affecting the indoor particulate matter concentration such as cleaning, window and door opening status, number of occupants and its movement, and air conditioner operation status will be monitored. In this paper, the ongoing measurement results will be presented. The measurement results as follows; the PM concentration in the classroom showed high concentration when the occupancy density when the lecture was high and natural ventilation was not performed. However, in the lecture room with low occupancy density, the particulate matter decreased even though natural ventilation was not occurred.

급배기 교번식 축열회수 환기시스템의 배기 재유입률 측정방법 제안

박소우(So Woo Park),남정화(Jung Hwa Nam),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

In recent years, as particulate matter becomes a social issue, interest in ventilation systems is increasing, and various types of ventilation systems are being developed. The Bidirectional Ventilation System(BVS) is a single duct system that stores exhausted heat in a heat exchanger and receives heat from the heat exchanger in the air supply mode to introduce air. However, there can occur a external recirculation, which is a part of the exhausted polluted air in the exhaust mode is introduced to indoor. The existing external recirculation evaluation method is applicable only to a double duct ventilation system with simultaneous supplies and exhausts. Therefore, it is difficult to apply the existing evaluation method because in Bidirectional Ventilation System, the air supply and exhaust are alternately operated by using one duct. This paper describes the external recirculation characteristics of the Bidirectional Ventilation System and proposes a external recirculation rate evaluation method applicable to a single duct system. Finally, the external recirculation rate of the Bidirectional Ventilation System was measured by empirical experiments.

표준기상데이터 작성을 위한 풍속 데이터의 보간 방법 및 적합성 평가

박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

In order to write a typical weather data for building energy simulation, the meteorological data of 1 hour interval is required, but many measurement data are missing. Therefore, it is necessary to recover the missing data using appropriate interpolation methods. The interpolation of the wind data is not simple due to variations of wind velocity in time and location characteristics. Generally, linear interpolation method is used to recover the missing weather data, but wind velocity data is often not suitable for linear interpolation due to its frequent fluctuation. In this study, as a wind velocity interpolation method, Inverse Distance Weighting, Coefficient of Correlation Weighting were analyzed for Dae-jeon area. As a result, it is necessary to apply proper interpolation methods depending on season and year for the same region.

실내외 조건에 따른 대학교 강의실 미세먼지 특성 분석

박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11

The university classroom is one of the most vulnerable places for high density particulate matter(PM). University classroom is often enclosed for blocking the ambient noise during the class, more than 1 hour, and almost university buildings do not have a ventilation system or air purification system. In addition, the number of students per classroom in university is higher than other space. As a result, PM concentration in the classroom can be higher than the domestic standard. The purpose of this study is to investigate the relation between the factors affecting the PM concentration in the university classroom by long-term field measurement. Indoor PM concentration will be measured in three classrooms and outdoor PM will be measured on the roof of the building. Factors affecting the indoor particulate matter concentration such as cleaning, window and door opening status, number of occupants and its movement, and air conditioner operation status will be monitored. In this paper, the ongoing measurement results will be presented. The measurement results as follows; the PM concentration in the classroom showed high concentration when the occupancy density when the lecture was high and natural ventilation was not performed. However, in the lecture room with low occupancy density, the particulate matter decreased even though natural ventilation was not occurred.

고층 주거건물에서 수직적 미세먼지 이동 특성계수인 침착률의 분석

박소우(So Woo Park),채운(Yun Cai),송두삼(Doo Sam Song) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6

Vertical air movement of the building, driven by thermal buoyancy effect, is called the stack effect. Contaminants including particulate matters (PM) can also be transported accompanied by vertical air flow in high-rise building. However, PM has its own diameter and mass, it can deposit on the surface of the airway, that is the concentration of PM can be different from the general scalar concentration such as CO₂. The purpose of this study is to analyze the deposition rate of PM in vertical airway of high-rise buildings. Filed measurements were accomplished in a high-rise residential building with 43 ground floors and two basement floors in winter. As a result, the indoor PM concentration was the highest in the Neutral Pressure Level (NPL), and decreased toward the upper and lower floors. Also, the PM concentration in the airway decreased from the bottom zone to the top zone because of the PM was deposited on the surface according to the vertical airway. The deposition rate in indoor and airway increased as the PM size is increased, this is because of the gravity effect increased as PM size increased.

기밀성능의 블로우도어 측정치와 실내외 온도차를 고려한 실제 침기량과의 차이에 대한 장기실험 결과 분석

박정민(Jung Min Park),박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6

The building’s airtight performance is very important in defining the energy performance and indoor air quality problems. As a method of measuring the airtightness of buildings, a blow door fan press method is widely used. This method pressurizes the room and defines the air-tightness of the building according to the amount of air discharged. The calibration constant N=20 is used to convert the air-tightness performance of the blower door test to the normative infiltration rate of natural conditions. The infiltration rate is not constant and changed by the indoor and outdoor temperature differences. That is, the difference between normative infiltration rate and actual infiltration rate is inevitable. In this study, the actual infiltration were analyzed by long-term measurement under winter conditions in Korea. The difference between normative and actual was analyzed based on the measurement results. The compatibility of correction constant N = 20 under climate condition in Korea was analyzed.

어린이집의 에어커튼 설치를 통한 실내 미세먼지 저감 효과 분석

박정민(Jung Min Park),박승환(Seung Hwan Park),박소우(So Woo Park),송두삼(Doo Sam Song) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.8

Adverse health effects of particulate matters (PM) on the elderly, children, and people with pre-existing cardiovascular and respiratory diseases. have been reported to be more pronounced. The Korean government has enacted and managed special laws for vulnerable groups such as children and facilities they use. The outside PM flow into buildings along with air movement caused by infiltration. The PM is also generated by indoor activities such as cooking and cleaning. It can be transported to other rooms. The aim of this paper was to analyze PM concentration caused by the inflow of PM into the room when the front door was opened and the PM generated by cooking in a daycare center. The effect of installing an air curtain in a daycare center for blocking PM from outdoor and preventing transport from indoor PM generated by cooking was also analyzed by CONTAM simulation. Results showed that the air-curtain at the main entrance blocked the inflow of outdoor air and PM compared to the wind break room. When cooking in a cooking room, operating the range hood and air curtain at the same time showed the highest effect of removing PM. During cooking, the PM concentration in the cooking room did not directly affect the PM concentration in adjacent child care rooms. In the case of child care room adjacent to the cooking room, the outdoor air and PM flew into the child-care room according to the operation of the hood in the cooking room.

교실에서 에어컨 기류에 따른 오염물질(비말) 확산 특성의 검토

박정민(Jung Min Park),박소우(So Woo Park),박승환(Seung Hwan Park),채운(Yun Cai),송두삼(Doosam Song) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6

In order to prevent the spread of SARS-CoV-2, lots of countries are applying social distancing, ban on provate gatherings. SARS-CoV-2 is transmitted by direct contact, spread of droplets of different sizes; when the droplet particles are <5㎛ in diameter, they are referred to droplet nuclei. According to current evidence, COVID-19 virus is primarily transmitted between people through respiratory droplets and contact routes. In addition, respiratory droplets transmitted by the air current of air-conditioners in an enclosed space. Air-conditioner can be a super-spreader of the COVID-19 virus in an enclosed space, it is required to analysis the spread of droplets according to the air current of air-conditioner. The aims of this study is to investigate the transmission characteristics of droplets in a condition with or without air-condition operation. Respiratory droplets can be considered passive contaminants that are passively diffused by air currents. In this study, when droplets (pollutants) occur in school classrooms, which inevitably have to be taught even in COVID-19 situations, we intend to experimentally examine the characteristics of indoor diffusion according to the location of pollutants and the air current of the air-conditioner.