• Research Article

    Experimental Analysis of Indoor Air Pollutants Removal with a Mechanical Ventilation System in a Residential House

    실제 거주 환경에서의 주거용 기계환기설비를 통한 오염물질 제거 성능 실험 분석

    Cho, Kyung-Joo, Jeong, Jin-Hee

    조경주, 정진희

    This study aimed to quantitatively estimate the removal of indoor air pollutants using a mechanical ventilation system that was installed in typical … + READ MORE
    This study aimed to quantitatively estimate the removal of indoor air pollutants using a mechanical ventilation system that was installed in typical apartment houses in Korea. For CO2, the Korean indoor air quality standard (1,000 ppm) could not be maintained even with 1.5 ACH. The time for reducing the CO2 concentration 3,000 ppm to 1,000 ppm were measured to be 416, 126, 89, and 58 minutes, for 0.0, 0.5, 1.0, and 1.5 ACH, respectively. For radon, it was difficult to lower the indoor concentration with only the natural decay method, and with the 0.5 ACH ventilation rate (mechanical ventilation), the indoor radon could not be effectively controlled. The removal rates were 23.5% for 0.5 ACH, 30.4% for 1.0 ACH, and 39.7% for 1.5 ACH after 2 hours of ventilation. The results of these experiments show that it is difficult to meet the indoor air quality standard with only 0.5 ACH ventilation. In addition, more than 1.5 ACH ventilation could be also necessary to remove high-level indoor air pollutants effectively. Moreover, it was confirmed that indoor air pollutant concentrations should be lowered using mechanical ventilation systems because radon is radioactively decayed, but inflow and accumulation from emission sources affecting the indoor space are present. - COLLAPSE
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    30 August 2022

  • Research Article

    Analysis of Thermal Comfort in the Swing Season according to Metabolic Rate Change Before and After Class for Occupants

    강의 전, 후 재실자 대사량 변화에 따른 중간기 쾌적도 분석

    Ryu, Ji-Hye, Lee, Ji-Ae, Hong, Won-Hwa, Won, An-Na

    류지혜, 이지애, 홍원화, 원안나

    The operating hours of class rooms in university buildings vary according to each class schedule, and the operating schedule of air conditioners … + READ MORE
    The operating hours of class rooms in university buildings vary according to each class schedule, and the operating schedule of air conditioners is flexible. It has a high occupancy density compared to the short occupancy time, so the optimum IEQ (Indoor Environmental Quality) cannot be guaranteed. In addition, the learner also shows the limit of the opportunity for thermal adaptation. Therefore, in this study, quantitative evaluation was carried out by calculating the comfort temperature by analyzing the metabolic rate before class, thermal comfort related to thermal adaptation for a short time after class, and changes in the occupant’s thermal sensation during lecture. As a result of examining the occupants’ thermal sensation (Thermal Sensation Vote, Comfort Sensation Vote, Thermal Preference), it was found that they showed thermal stability after class. It could be understood that this was influenced by the difference in the metabolic rate of the occupants that occurred within a short time before class. Through the difference in comfort temperature of 1.78°C, thermal comfort before and after class was quantitatively evaluated. In order to promote the air conditioning operation strategy of the university building lecture room and the comfort of the indoor heating environment, it is necessary to identify and reflect changes in short-term thermal adaptation, metabolic rate, and thermal comfort of occupants. - COLLAPSE
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    30 August 2022

  • Research Article

    Airborne Pathogen Spread Patterns by Various Ventilation Methods in Small Restaurants

    소규모 식당의 배기방식에 따른 실내 공기전파감염원 확산 양상 분석

    Cheong, Chang-Heon

    정창헌

    This study evaluated the airborne pathogen spread patterns at small restaurants by implementing various ventilation methods. This study evaluated the local exhaust … + READ MORE
    This study evaluated the airborne pathogen spread patterns at small restaurants by implementing various ventilation methods. This study evaluated the local exhaust ventilation (LEV) system types and its’ performance by Computational Fluid Dynamics simulation tool, Star-CCM+. The simulation results indicate that the performance of LEV system is influenced by buoyancy effect of the room. Although the outlet of the LEV system is at a low elevation, it has limited performance in removing airborne pathogens when horizontally away from the infector. On the other hand, outlet of ventilation system installed at the ceiling result in lower airborne pathogen concentration. The results of this study demonstrates the importance of the considering indoor buoyancy effect while designing LEV system. - COLLAPSE
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    30 August 2022

  • Research Article

    An Analysis of the Effect of the Data Preprocess on the Performance of Building Load Prediction Model Using Multilayer Neural Networks

    데이터 전처리 과정이 다층신경망을 이용한 건물 부하 예측 모델의 성능에 미치는 영향 분석

    Seong, Nam-Chul, Hong, Goo-Pyo

    성남철, 홍구표

    Data preprocess affects the performance improvement of predictive models using neural networks. However, previous studies have not analyzed the effects of data … + READ MORE
    Data preprocess affects the performance improvement of predictive models using neural networks. However, previous studies have not analyzed the effects of data preproces. Therefore, in this study, the effect of data preprocess in a load prediction model using a multilayer neural network was analyzed. After constructing a multilayer neural network and generating learning data using a reference building, the performance of the predictive model was evaluated and compared through index of ASHRAE Guideline 14. As a result of the study, it was confirmed that the prediction results were improved through data preprocess. Compared to non-data preprocess models, the CvRMSE of models that performed data preprocess was improved from 21.47% to 10.74%, and MBE from 7.71% to 4.11%. It was found that the predictive performance improvement effect of data cleaning that removes missing values of data was greater than that of data transformation that converts the form of data. - COLLAPSE
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    30 August 2022

  • Research Article

    A Study on the Development of Window-Attached Ventilation Panel Using Air-Flow Inducing

    기류 유인을 이용한 창호 부착형 환기 패널 개발 연구

    Park, Sang-Hoon, Lee, Han-Sol, Ahn, Nam-Hyuk

    박상훈, 이한솔, 안남혁

    It is very important to prepare ventilation measures in buildings. In particular, the importance of indoor ventilation has been further emphasized due … + READ MORE
    It is very important to prepare ventilation measures in buildings. In particular, the importance of indoor ventilation has been further emphasized due to the COVID-19. In this study, the window-attached ventilation panel that combines mechanical ventilation and natural ventilation was developed for ventilation of school classrooms, which is a typical densely populated facility, and its performance was verified through experiments. As a result of the experiment, when the airflow outlet of the ventilation panel faces the center at an angle of about 45°, and the smaller the panel area, the higher the airflow velocity and airflow by airflow induction. When the airflow rate of the impeller is high, the air flow speed of the diffuser increases, which increases the induced air flow, so the ventilation air volume is also high. When the window- attached ventilation panel was applied to a classroom having a general volume, about 12 ventilation cycles could be satisfied. - COLLAPSE
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    30 August 2022

  • Research Article

    Evaluation on the Design Guideline of Thermal Output in Radiant Floor Heating Panel for Zero-Energy Apartment Building in Korea

    제로에너지 공동주택에서 바닥복사난방패널의 방열량 설계 기준 평가

    Lim, Jae-Han

    임재한

    This study aims to analyze the thermal output and downward heat loasses according to the pipe pitch of the floor heating panels … + READ MORE
    This study aims to analyze the thermal output and downward heat loasses according to the pipe pitch of the floor heating panels for the design of a radiant floor heating system in a zero-energy apartment to compare the design heating load in zero-energy apartment housing unit. The thermal output and downward heat losses were analyzed according to the pipe pitches, flooring and pipe materials by using the universial single power function method in ISO 11855-2. The results showed that the heating load could be removed even if the pipe pitch of the existing radiant floor heating system is changed to around 350 mm as the thermal insulation and airtightness in the zero-energy apartment building has been greatly improved. The thermal output in individual heating was about 30% higher than that of district heating. In addition, it was found that it was necessary to consider the thermal resistance of flooring materials for the design of the radiant floor heating panel because it would affect the thermal output through the room air. When the lowerest floor was exposed to the outside air, downward heat losses greatly increased, so it would be necessary to increase the outside thermal insulation thickness for the energy saving during heating operation. - COLLAPSE
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    30 August 2022

  • Research Article

    Energy Performance Evaluation by Thermal Bridging Level of Stone-Finished Exterior Insulation System for Small and Medium-Sized Buildings for Green Remodelling

    그린 리모델링을 위한 중소규모 건물 석재 외장 외단열시스템의 열교 수준별 에너지성능 평가

    Choi, Bo-Hye, Song, Seung-Yeong

    최보혜, 송승영

    The purpose of this study is to compare the energy performance of the existing case using a conventional rectangular pipe frame and … + READ MORE
    The purpose of this study is to compare the energy performance of the existing case using a conventional rectangular pipe frame and alternatives using double and single truss-shaped insulation frames and insulation pads to reduce linear and point thermal bridges in a stone-finished exterior insulation system. Annual heating and cooling energy use was estimated by performing a dynamic building energy simulation. In the building energy simulation, the thermal bridging effect was reflected by the linear and point thermal transmittance obtained from the 3D steady-state heat transfer simulation. Annual heating and cooling energy cost was estimated together. The results showed that the annual energy use of alt D and alt S with insulation frame decreased by 15.4% and 16.6%, the annual energy cost decreased by 14.6% and 15.7%, respectively. The annual energy use of alt D-P and alt S-P with insulation frame and pad decreased by 15.5% and 16.8%, the annual energy cost decreased by 14.7% and 16.0%, respectively. - COLLAPSE
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    30 August 2022

  • Research Article

    An Analytical Study on Heating and Cooling Demand Using Cool Roof System in Deteriorated Single Family House

    노후 단독주택에서 쿨루프의 적용을 통한 냉난방 요구량 변화에 대한 해석적 연구

    Hwang, Seok-Ho

    황석호

    A cool roof has the advantage of reducing the urban heat island effect and building cooling requirement by reflecting solar radiation on … + READ MORE
    A cool roof has the advantage of reducing the urban heat island effect and building cooling requirement by reflecting solar radiation on the roof surface. Therefore, it is being used as a green remodeling technology for deteriorated buildings. However, to evaluate the performance of the cool roof, it is necessary to evaluation of increases of heating demand due to the decrease of solar heat gain in winter. The ratio of heat gain and loss on the roof surface was analyzed according to the insulation level of old buildings. In particular, buildings with good insulation can reduce heat loss in winter, but may increase cooling requirements in summer. Therefore, reducing the heat gain through the cool roof in summer can be a good alternative. It was confirmed that the heat gain in summer through the roof surface decreased rather than the heat gain in winter, so, the heating and cooling demand was reduced by 27% on the flat roof and 30% or more on the slope roof. - COLLAPSE
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    30 August 2022
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