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냉난방수배관시스템용 차압독립형 유량제어밸브의 유동특성 연구
민준기,원보영,정신규,Min, Joon-Ki,Won, Bo-Young,Jeong, Shin-Kyu 한국지열에너지학회 2017 한국지열에너지학회논문집 Vol.13 No.3
In this study, set values of PICV(Pressure Independent Control Valve) were simulated according to the pressure distribution and velocity. The higher the set value and the open rate, as the lower the pressure in the neck. On the contrary, the lower the set value and open rate, as the higher the pressure in the neck. When the set value was small, the pressure was distributed sufficiently and confirmed that the pressure was generated by the VOF, confirming that it could generate a vapor pressure. When the set value 100 %, the lower corn open rate of the differential pressure was 46 % to 29 %, set value 100 % was 29 % to 19 %, and set value 6 % was 12 % to 6 % for the lower corn open rate percentile, it was limited to within 50 %. Thus, the results of this study on the correlation between open rate and differential pressure of the set value of the PICV will be beneficial to improve performance of flow control valves and contribute to their efficient operation used for a hydronic system.
활용 가능 기상 예보 인자를 이용한 건물 소비 전력 예측 모델 개발
구기범(Ki Beom Ku),정신규(Shin Kyu Jeong) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In this study, building energy prediction models were constructed using kriging model. 12 prediction models were constructed by monthly, and each model predicting daily building energy hourly. Kriging model was used for building energy modeling. Building energy model data were accumulated by EnergyPlus. As design variables, available weather forecasting factors from KMA were used. To obtain accurate building energy prediction value, this study used variogram to analyze correlation between building energy data. As the result of variogram analysis, a proper kriging correlation function was selected. Each model showed predictability of MBE 1~5%.
유전알고리즘을 이용한 오피스 건물의 피크전력 감소를 위한 일일 예냉설정온도 최적화 연구
구기범(Ki Beom Ku),정신규(Shin Kyu Jeong) 대한설비공학회 2022 설비공학 논문집 Vol.34 No.1
In this paper, the peak electric power of an office building was reduced with a precooling strategy. Precooling was conducted two hours before work time. Set-point temperatures for precooling were optimized using a genetic algorithm to minimize daily peak electric power. Searching for optimized set-point temperature was conducted with an objective function that was developed with a multiple regression model. The regression model used dry-bulb temperature, relative humidity, and the set-point temperature as the input parameters, and set daily peak power of the building as the output parameter. Model data were collected from ‘EnergyPlus’, a building energy simulation program. The applied building was ‘Medium Office’ provided by EnergyPlus. Based on our results, there was a 0.71~5.64% reduction in daily building peak power with the application of the optimized precooling setpoint temperature. In addition, the reduction of electricity cost due to the reduction of peak electric power was observed.
구기범(Ki Beom Ku),정신규(Shin Kyu Jeong) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Energy Storage System (ESS) attracts a lot of attentions as one of building energy management systems. There are many applications of ESS. One of them is to decrease the energy consumption in peak time using ESS to prevent from blackout. In this study, an optimized ESS operation system using genetic algorithm (GA) is developed to decrease the cost of electricity. Hourly uses of energy(electricity) in a building is estimated by using EnergyPlus simulation and optimum charging and discharging schedule is determined using Genetic algorithm. To obtain optimum ESS capacity of given building, ROI and maximum profit in expectancy life were calculated by varying ESS capacity.
김경훈,정신규 慶熙大學校 레이저 工學硏究所 1998 레이저공학 Vol.9 No.-
A practical design method for supersonic airfoils and wings based on the solution of the Euler/Navier-Stokes equations is described. This design technique uses an inverse approach. The present inverse method is based on Takanashi's"residual-correction"concept. The difference between the computed pressure distribution of a given geometry and the prescribed target pressure distribution is iteratively reduced by solving the integrodifferential form of linearized small perturbation(LSP) equation. The pressure distribution is computed by Euler/Navier-Stokes equation. Sample of supersonic wings design case will be shown.