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공기순환장치를 이용한 실내 환기성능 및 온열환경 개선에 대한 실험적 연구
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2018 한국건축친환경설비학회 논문집 Vol.12 No.3
Although natural ventilation is effective in improving indoor air quality in the intermediate season, its effect can be reduced if single-sided ventilation is applied to the room with much depth. In this case, interior zones can suffer from the insufficient ventilation rate, which can result in poor indoor air quality and occupants’ discomfort. This problem may be solved by implementing air circulators, which can diffuse the air in the perimeter zone into the entire space. In this context, the impact of air circulators on the ventilation performance and thermal environment was investigated through field measurement in a lecture room. Air circulators were combined with the mechanical ventilation (energy recovery ventilator) and natural ventilation. Measurement results showed that the air circulator can reduce CO₂ concentration by enhancing air diffusion in the entire space, when it is combined with the natural ventilation. In addition, it was found that the combination of air circulators and natural ventilation is effective in providing thermal comfort by increasing air speed, particularly during the intermediate season when the outdoor temperature is relatively high. It can be concluded that the air circulator can be utilized to supplement the single-sided natural ventilation for the room with much depth.
열적으로 활성화된 광선반 시스템의 냉방 효과 시뮬레이션 연구
이규남(Rhee Kyu-Nam),황태연(Hwang Taeyon) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.6
A light shelf is commonly used to mitigate glare discomfort and overheating by preventing solar radiation from penetrating the indoor space. If the light shelf can be thermally activated, it can also be used for space cooling, particularly for the perimeter zone in buildings. In this study, a thermally activated light shelf (TALS) system was proposed, where the light shelf was integrated with a radiant cooling panel system. To examine the applicability of the TALS system, heat transfer simulations were conducted using the Physibel software. Based on the simulation results, the layer of TALS was determined to maximize cooling capacity at the lower panel surface while minimizing the lower surface temperature. Transient simulations were also conducted to evaluate the cooling effect of the TALS system during the summer season. Simulation results showed that the TALS system could reduce the average perimeter and interior zone temperature by 2.23°C and 2.19°C, respectively. With the TALS system, the maximum temperature was reduced by 3.2°C in both the perimeter and interior zones. It was found that the TALS system could effectively reduce the room air temperature, which could lead to cooling energy savings. The impact of the TALS system on cooling energy consumption needs to be investigated in future studies.
설비형 칠드빔 시스템 및 일반 공조 시스템 적용 공간의 온열환경 균일도 비교 평가
이규남(Rhee, Kyu-Nam),최선호(Choi, Sun-Ho),김창훈(Kim, Chang-Hoon) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.10
It is one of major objectives to achieve a uniform thermal environment and to minimize the local discomfort, when designing or operating air distribution systems. An active chilled beam (ACB) system, which is gaining much popularity owing to reduced fan energy consumption, needs to be evaluated in terms of uniform thermal environment, because it is operated with much smaller air flow rate than conventional all-air systems. The uniform thermal environment, or thermal uniformity, can be evaluated by analyzing air diffusion performance index (ADPI), local discomfort parameters within conditioned space. This study presents an evaluation method on the thermal uniformity in a room with different air distribution systems. To do this, a test bed facility was constructed so that four different air distribution systems, including ACB system, can be separatively operated. The ADPI of the ACB system was 80.7%, which is lower than that of all-air system, however, it could satisfy the recommended level (80%) of ADPI by ASHRAE. Although the ACB system resulted in the relatively low draught risk, averagely 6.7%, it was found that some regions near the chilled beam can be exposed to the draught risk due to the descending cold air. Vertical air temperature difference was not higher than 1.0℃, showing that the ACB system resulted in efficient air mixture in the vertical direction. It can be concluded that the ACB system can attain an acceptable thermal uniformity with much less air flow rate than other conventional air distribution systems.
기류속도의 영향을 고려한 천장복사냉방패널의 냉방용량 평가 유닛 개발
이규남(Rhee, Kyu-Nam),김상엽(Kim, Sang-Yeop),최지수(Choi, Ji-Su) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.6
In this study, an evaluation unit was proposed to analyze the cooling capacity of ceiling radiant cooling panel (CRCP) system. The aim of this study was to develop a low-cost and simple testing device by which the cooling capacity of a single CRCP can be evaluated and the impact of air velocity on the cooling capacity can be analyzed. For this purpose, a thermoelectric element module (TEM) was adopted to produce the hot water for the cooling load as well as the chilled water for the CRCP. The configuration of TEM, cooling fans, and radiator was studied to achieve the proper temperature of hot and chilled water. In addition, a cross flow fan and fan speed controller were deployed to represent the air flow at panel surface. The test results showed that the cooling capacity of the evaluated CRCP was 103.3 W/㎡, without the air flow at panel surface. It was also found that the cooling capacity can be enhanced up to 176.0 W/㎡ when the air velocity increases up to 2.0 m/s. The enhanced cooling capacity led to the increased temperature difference between room air and chilled water, which implies the possible mitigation of condensation risks.
실별 바닥 마감재 차이를 고려한 바닥난방 시스템의 온수유량 조절 효과
이규남(Rhee, Kyu-Nam),김종현(Kim, Jong-Hyun),김광명(Kim, Kwang-Myung),김범수(Kim, Bum-Soo),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.4
In this study, the impact of floor coverings on the behavior of floor surface and room air temperature was investigated through mock-up experiment and energy simulation. The results showed that temperature unbalance between each room can be caused by different floor covering material. PVC flooring showed the fastest speed of temperature rise and descend, followed by VCT (Vinyl composite tile), wood and porcelain tile. It was found that the rise time is related with the heat capacity and thermal resistance, which were analyzed based on the heat balance equation. Thus, it was suggested to adjust water flow rate considering the heat capacity and thermal resistance of floor covering, in order to minimize the temperature unbalance in each room and the probable thermal discomfort. The augmented flow rate resulted in the reduced rise time in the room with massive floor covering such as porcelain tile, which was also effective in mitigating the temperature unbalance in each room. In addition, it was found that the rise time and temperature unbalance can be more reduced by resetting the augmented flow rate to design flow rate, if room air temperature approaches its set-point temperature.
스플릿 블라인드의 슬랫 조절 방식에 따른 실내 환경 및 에너지 성능 평가
이규남(Rhee, Kyu-Nam),정근주(Jung, Gun-Joo) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.5
The performance of Venetian blinds can be improved by adopting split blinds by which the slat angle in the upper and lower part of the blinds can be separately adjusted. In this study, the impact of the split blinds on the lighting/thermal environment and energy consumption was investigated through field measurement, occupant survey and energy simulation. Four different adjustment methods were evaluated: Case 1 (No blind), Case 2 (All slats open), Case 3 (Upper slats open, lower slats closed), and Case 4 (All slats closed). The evaluation result of lighting environment showed that Case 3 is effective in preventing the excessive illuminance level as well as glare in the winter season, while Case 2 or 3 is suitable for the summer season because the high solar altitude reduces the transmitted solar energy, which leads to the reduced glare risks. The evaluation result of thermal environment revealed that acceptable thermal comfort can be achieved by Case 2 or 3 in the winter season, and Cases 2 to 4 in the summer season. Energy simulation results showed that the overall energy consumption (heating, cooling and lighting energy) can be minimized by applying Case 3, by which the energy consumption can be reduced by 6.2% compared to Case 1.