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이범석 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-
An explicit algorithm is presented for determining the cooling water velocities flowing in the heat exchangers network in the chemical plant. The problem solution is based on the steady-state equations which describe the cooling water which flows in the heat exchangers network. Since the equations are non-linear, Newton-Raphson method is used to solve the system of equations. Numerical examples are presented to illustrate the scope of this work which can be handled with the formulation.
다공성 관을 흐르는 유체의 유속, 압력, 투과수 유량에 관한 연구
이정묵,이범석 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
The flow rate of the fluid flowing in a porous membrane tube decreases as the fluid flows out through the wall of the tube. In order to find out the relationships between the flow velocity, pressure and the permeate flow rate, we considered the membrane as a linear porous tube with constant diameter and set the mass balance with the fluids and the permeates for each unit length. On this basis, the systems of nonlinear second order differential equations are derived for the entire porous tube. Since these equations are nonlinear, Gauss-Siedel method or the numerical method for the nonlinear differential equations must be used to solve the system. Since the flow rate of the permeate is varied with the operating condition such as the pressure, the solutions of the equations are achieved at each condition, using the numerical integration methods such as the Simpson's rules. In order to analyze and compare simulation results, we have performed the practical experiments using the porous tubular membranes with the constant diameter. The computer simulation and the experimental results are presented to illustrate the scope of this work.
장치비용과 에너지 회수비용을 함께 고려힌 다품종 회분식 공정의 최적 설계 및 생산계획
이인범,이의수,조익상,이범석 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.4
연속식 공정에서와는 달리 회분식 공정에서 에너지 회수를 위한 열교환을 하기 위해서는 부득이 생산일정을 변경하여야만 하고, ZW policy를 따르는 대부분의 회분식 공정에서는 이럴 경우 생산주기가 늘어나게 되어 결국은 회분식장치 크기의 증가가 요구된다. 늘어난 장치 설비비용의 부담으로 인해 공정설계 엔지니어들은 열교환의 가능성을 무시하고 초기설계를 마치는 경우가 많다. 본 논문에서는 다품종 회분식 공정의 생산일정, 필요한 회분식장치의 크기, 그리고 열교환에 필요한 수학적인 식들로써 구성된 혼합정수 비선형 프로그램의 최적화 해를 구하여서 회분식 공정에서의 열교환 가능성과 그 경제성을 검토해 보고자 한다. 이해를 돕기 위하여 열교환 가능성이 있는 다품종 회분식 공정을 예로 들어 본 연구 결과를 적용해 보았다. Differently from continuous processes, the processing schedule of batch processes should be modified for heat exchange between batch streams. In most batch processes in which ZW policy is adopted, the heat integration causes the increased production cycle time that require the bigger batch equipments sizes. Process design engineers usually finish the initial batch process design neglecting the possibilities of heat integration due to the increased equipment costs in that case. In this study, the schedule of multi-product processes, the required equipments sizes and the heat exchange between batch streams are mathematically formulated in a mixed integer nonlinear programming. A solution of this formulation can be readily obtained with a commercial MINLP solver. Numerical examples are presented to illustrate the possibilities of heat exchange in a multi-product batch process.
인터넷 웹을 기반으로 한 공정규명과 공정제어 교육 시스템
김태언,이범석 경희대학교 산학협력기술연구원 2002 산학협력기술연구논문집 Vol.8 No.-
As the computer systems are developed rapidly, the area of the engineering softwares are also expanded. Most of these engineering softwares are the high-priced commercial softwares for the exactness of the results. However, the commercial softwares are too expensive for some users. especially undergraduate students. In this study, the engineering software for the chemical process control is made of the JAVA language in a web environment. Then the virtual experiment of the process control can be executed free of charge using this software. This software is worked on the internet and shows how to identify a unknown process system and how to tune the control parameters to operate the process system. The numerical examples are presented to illustrate the virtual experiment for the process control using the software made in this study.