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생물막 반응기내 다공성 중공사형막을 이용한 운전방식에 따른 흡입 압력
김민형,구응모,이민수,정건용,Kim, Min Hyeong,Koo, Eeung Mo,Lee, Min Soo,Chung, Kun Yong 한국막학회 2021 멤브레인 Vol.31 No.5
본 연구에서는 다공성 중공사형 분리막(multi-bore capillary membrane module)을 생물막 반응기(MBR)에 침지시켜 운전시간에 따른 흡입 압력을 측정하였다. 공칭 세공크기가 0.2㎛, 외경이 6.4 또는 4.2 mm이고 육각 형태인 중공사형모듈을 MLSS 8,000 mg/L 활성 슬러지 수용액에 각각 침지시키고 투과 유속, 공기량에 따른 변화를 확인하였다. 여과운전/정지이완(FR) 및 정지이완 시 역세척(FR/BW) 및 사인파형 투과유속 연속운전(SFCO) 방식으로 조작하였다. SFCO의 흡입 압력은 30 L/m<sup>2</sup>·hr에서 낮았으며, 50 L/m<sup>2</sup>·hr에서는 FR의 흡입 압력이 높게 나타났다. 또한 외경이 작은 모듈의 흡입 압력 상승이 비교적 낮았으며, 외경이 큰 모듈의 흡입 압력은 높게 상승하였지만 역세척으로 40% 이상 감소시킬 수 있었다. In this study the suction pressure was measured with respect to operational time by submersing the multi-bore capillary membrane module in membrane bioreactor(MBR). The hexagonal shape capillary module which has the nominal pore size of 0.2 ㎛, outer diameter of 6.4 or 4.2 mm was immersed in MLSS 8,000 mg/L active sludge aqueous solution, and confirmed changes with respect to permeation flux and air flow rate. It was operated by the filtration/relaxation(FR), FR with backwashing(FR/BW), and sinusoidal flux continuous operation(SFCO) modes. The suction pressure for the SFCO and FR modes was lower at 30 and 50 L/m<sup>2</sup>·hr, respectively. In addition, the suction pressure of the module with a small outer diameter was relatively low. The suction pressure of a large outer diameter was greatly increased, but it could be reduced by more than 40% by backwashing.
상세 동적 건물에너지 해석 프로그램의 일사량 계산 효율 향상을 위한 연구
김민형(Kim, Min-Hyeong),전민석(Jeon, Min-Seok),김광우(Kim, Kwang Woo) 대한건축학회 2023 대한건축학회 학술발표대회 논문집 Vol.43 No.2
The study aimed to improve the calculation efficiency of solar irradiance on the inclined building envelopes in a detailed dynamic building energy analysis program. All equations in the calculation process of ISO 52010-1 were reviewed to determine overlapped or repeated calculation parts, and then it was analyzed which tearing technique or memoization technique was appropriate for each part. According to the results of the analysis, overlapped calculations were eliminated by applying tearing techniques, and repeated calculations of solar irradiance depending on the orientation and slope angle of the envelopes were eliminated by applying the OrientationSlope object as a memoization technique. Afterwards, the degree of improvement in simulation calculation efficiency was analyzed for model buildings. As a result of the analysis, the calculation time for one orientation-slope angle combination is the same, but in high-rise buildings with a large number of envelopes but a small number of orientation-slope angle combination envelopes, this technique has a great effect and must be applied.