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ERV 필터교체를 통한 교실 환기 성능 개선에 관한 연구
최재솔(Jae Sol Choi),박효순(Hyo Soon Park),이재혁(Jae Hyuk Lee),김의종(Eui-Jong Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This study aimed to measure decreasing effects of CO2 Concentration by a ERV filter replacement. Field tests were carried out on the same classroom before and after replacing the ERV filter. Measurement results in air flow rate have shown that the amount of supply and exhaust air has been increased by the filter replacement, consequently decreasing CO2 Concentration. The air supply and the exhaust have increased by 7.6% and 28.7% respectively, and the CO2 Concentration has decreased by 15% in the ceiling and 17% in the living area. Thus, regular filter replacements may help keep the classroom in a comfortable space.
A-PVT 컬렉터를 연계한 환기장치의 난방에너지 절감 및 전력생산량 시뮬레이션 분석
최재솔(Jae Sol Choi),오민석(Min Seok Oh),김의종(Eui-Jong Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
This study evaluates the feasibility of a proposed PVT system in terms of reducing heating energy consumption. Target energy savings are due to reduced ventilation load and increased PVT power production. The proposed system utilizes the heated air through the PVT module, and the heated air is connected to a typical energy recovery ventilator (ERV). A performance test was performed for the proposed A-PVT, and optimization was performed to match the test and simulation results by fitting important parameters. When the proposed system operates according to a proposed control plan, the heating energy consumption is decreased by 15.43%. In addition, the heat collected on the back of the PVT can be rejected by means of the air induction to the ERV, the PVT power generation is increased by 5.42%. As a result, simulation analysis shows that the proposed system has a total energy saving effect of 18.71% compared to a typical reference system.
풍향과 동 배치에 따른 아파트 단지의 풍압계수 및 자연환기성능 비교 연구
최재솔(Choi Jae-Sol),김의종(Kim Eui-Jong),윤성훈(Yoon Seong-Hoon) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.2
This study aimed to provide basic data and serve as a reference for the planning of natural ventilation in apartment complexes. To analyze the characteristics of the wind pressure coefficients and natural ventilation performance, six cases were selected. The cases were differentiated according to the building layout and height, and CFD (Computational Fluid Dynamics) analysis was conducted under three wind conditions. The results of natural ventilation performance based on wind pressure coefficients showed that a two-line layout provided better ventilation performance than a four-line layout under the same conditions. From the above results, the wind pressure coefficients and ventilation performance can be roughly categorized according to the building arrangement.
현장측정 창-벽체 접합부 선형열관류율 도출을 위한 시뮬레이션 기초연구
최재솔(Choi, Jae-Sol),김창민(Kim, Chang-Min),장향인(Jang, Hyang-In),김의종(Kim, Eui-Jong) 한국건축친환경설비학회 2020 건축환경설비 Vol.14 No.2
This paper is a preliminary study on a quantitative evaluation of the thermal bridge through window-wall joint based on infrared thermography. The purpose of the work is to check the possibility of deducing the linear thermal transmittance from the thermal images, but in this preliminary work, the images were obtained not from an infrared camera but from simulations. A reference model is proposed to describe a construction defect case on the window-wall joint. Above all, the linear thermal transmittance of the defect case and the reference model was derived through the steady-state simulation. The reference model could describe the defective case showing a similar linear thermal transmittance when iteratively modifying a joint thermal property of the reference model. Surface temperatures of the surrounding area of the window were checked under unsteady conditions, and the temperature difference was 0.012°C on average. This result may show that the similar process can be performed but inversely in in-situ tests to get the linear thermal transmittance by modifying the joint property to match the thermal image and the simulated surface temperatures.
현장측정 창-벽체 접합부 선형열관류율 도출을 위한 시뮬레이션 기초연구
최재솔(Choi, Jae-Sol),김창민(Kim, Chang-Min),장향인(Jang, Hyang-In),김의종(Kim, Eui-Jong) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.2
This paper is a preliminary study on a quantitative evaluation of the thermal bridge through window-wall joint based on infrared thermography. The purpose of the work is to check the possibility of deducing the linear thermal transmittance from the thermal images, but in this preliminary work, the images were obtained not from an infrared camera but from simulations. A reference model is proposed to describe a construction defect case on the window-wall joint. Above all, the linear thermal transmittance of the defect case and the reference model was derived through the steady-state simulation. The reference model could describe the defective case showing a similar linear thermal transmittance when iteratively modifying a joint thermal property of the reference model. Surface temperatures of the surrounding area of the window were checked under unsteady conditions, and the temperature difference was 0.012°C on average. This result may show that the similar process can be performed but inversely in in-situ tests to get the linear thermal transmittance by modifying the joint property to match the thermal image and the simulated surface temperatures.
열화상을 활용한 현장측정 기반의 창-벽체 접합부 선형열관류율 산출 방법
김창민(Kim, Chang-Min),최재솔(Choi, Jae-Sol),김의종(Kim, Eui-Jong),장향인(Jang, Hyang-In) 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.3
The occurrence of defects in wall-window joints directly affects occupants. However, there are challenges in measuring defects quantitatively due to the lack of evaluation standards. Therefore, this study proposes a digital twin-based method for calculating the linear thermal transmittance of wall-window joints using thermal images, and verifies its applicability. The applicability of the proposed field measurement-based linear thermal transmittance calculation method was verified by reproducing the results through chamber tests. The chamber tests were performed by fabricating specimens with construction defects, setting the internal and external temperatures to a dynamic state, and measuring the thermal images at four different time points. As a result of applying the proposed method, the maximum error of linear thermal transmittance between the four time points was 6.32%. The results demonstrate the possibility of quantitatively measuring defects in wall-window joints.