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인공신경망 변수에 따른 HVAC 에너지 소비량 예측 정확도 평가
김지헌(Kim, Jee-Heon),성남철(Seong, Nam-Chul),최원창(Choi, Won-Chang),최기봉(Choi, Ki-Bong) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.11
In this study, for the prediction of energy consumption in the ventilator, one of the components of the air conditioning system, the predicted results were analyzed and accurate by the change in the number of neurons and inputs. The input variables of the prediction model for the energy volume of the fan were the supply air flow rate, the exhaust air flow rate, and the output value was the energy consumption of the fan. A predictive model has been developed to study with the Levenbarg-Marquardt algorithm through 8760 sets of one-minute resolution. Comparison of actual energy use and forecast results showed a margin of error of less than 1% in all cases and utilization time of less than 3% with very high predictability. MBE was distributed with a learning period of 1.7% to 2.95% and a service period of 2.26% to 4.48% respectively, and the distribution rate of ±10% indicated by ASHRAE Guidelines 14 was high.8
흡착 건축자재 사용에 따른 실내공기질 개선 및 난방 에너지 소비량 절감 효과 분석
김지헌(Kim, Jee-Heon),성남철(Seong, Nam-Chul),최원창(Choi, Won-Chang) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.3
In this study, when sorptive building materials with toluene removal performance are applied, the effect of improving indoor air quality and the amount of heating energy consumption resulting from the replacement of mechanical ventilation system was evaluated. The sorptive building materials with a toluene removal rate of 69.4% were selected and the predicted toluene concentration by indoor application area was confirmed to show that the removal effect increased with the increase of the toluene area. When sorptive wallpaper is applied to both the ceiling and the wall, the toluene concentration is 483.9 to 796.6 ㎍/㎥. The results of assessing the substitution effect of mechanical ventilation system by sorptive building material showed that the replacement effect of the ventilation rate of 0.28 to 0.43 ACH was applied to both the ceiling and the wall, and the replacement effect increased as the load rate of sorptive building material increased. Prediction and evaluation of the effect of reducing heating energy consumption by replacing mechanical ventilation system of sorptive building material resulted in a 20.8% reduction in the gas consumption of boilers when both ceiling and wall were applied.
폼알데하이드 제거제를 첨가한 기능성 벽지의 흡착 성능 평가에 관한 연구
김지헌(Kim, Jee-Heon),성남철(Seong, Nam-Chul),윤동원(Yoon, Dong-Won) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.6
The purpose of this study is to evaluate performance of formaldehyde(HCHO) adsorption for improvement of decontamination of functional wallpaper added formaldehyde scavenger by its amount. Formaldehyde scavenger manufactured with ethylene urea(C3H6N2O) 35 weight percent, Glycol 2 weight percent and water(H2O) and it added to wallpapers during the manufacturing process. Ethylene urea has properties of to remove formaldehyde with a condensation reaction, and in widespread use recently. the wallpaper added formaldehyde scavenger manufactured in contrast to the weight of binder each case of 5%, 7%, 10%, 15%. It was conducted that to evaluate performance of formaldehyde adsorption for improvement of decontamination of functional wallpaper as compared each case. As a result, adsorption rate of formaldehyde for seven days was shown 50.43% when added 5 weight percent formaldehyde scavenger, 60.21% when added 7 weight percent, 63.45% when added 10 weight percent, and 73.58% when added 15 weight percent ,respectively. So, adsorption rate is as increased as added formaldehyde scavenger. Also, Total amount of adsorption is as increased as added formaldehyde scavenger. it was shown 5,736㎍/㎡ when added 15 weight percent formaldehyde scavenger
유전알고리즘을 이용한 중앙공조시스템 냉수배관계의 최적제어 방법
성남철(Seong, Nam-Chul),김지헌(Kim, Jee-Heon),최원창(Choi, Won-Chang) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1
This paper suggests the real-time optimal control method of central air-conditioning system using chilled water. The control variables for optimization are differential pressure of the pump and the supply chilled water temperature supplied to the air conditioning system produced from the central chiller. The optimal control variables of the control point are calculated using genetic algorithm in one-hour time step. The objective function of algorithm was the energy consumption of the HVAC system, and the energy consumption was calculated using the mathematical model. The results of the operation of the normal mode under the initial design conditions and the optimal operation mode with the optimal control variables were evaluated by comparing the energy consumption of the HVAC system with the variation of the control volume at the control point selected in this study. As a result, the chilled water supply temperature of the chilled water loop was operated by changing between approximately 9℃ and the differential pressure of the pump between 34.87 ㎪ and 78.91 kPa for the optimal control method. The total energy consumption of the HVAC system during optimal control operation was reduced by 16.98% compared to operation of the normal mode.