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허병기,목영일 한국화학공학회 1980 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.18 No.1
多成分系를 輕質 Key 成分과 重質 Key 成分으로 形成된 擬二成分系로 看做하고 系의 平均 比揮發度를 最上段과 最低段에서의 Key 成分의 幾何 平均으로 假定하는 등의 單純化 과정을 통하여 精密度는 多少犧牲하고 보다 신속한 그리고 지루한 試行錯誤法의 반복 계산을 迂回하는 새로운 精溜塔設計法을 提示하였다. 溜出液 및 塔低液의 組成, 最小 理論段數, 最小 還流比 計算法은 물론 하드웨어(Hardware)의 實際設計에 필요한 塔半徑, 높이, 段間隔, 熱負荷計算 등에 最適한 計算式을 提示하였다. 特히 全理論 段數를 求할 수 있는 圖解를 導出함으로서 복잡한 反復計算을 피하여 손쉽게 全 理論段數를 計算할 수 있게 하였다. 本 硏究에서 적용한 假定 및 單純化의 妥富性을 論證하기 위하여 Smith-Brinkly 簡易設計法(SB), Fenske-Underwood-Erbar-Maddox 簡易設計法(FUEM) 및 逐大段計算法(SBSM)에 의한 實際設計例를 本 硏究의 計算結果와 比較 檢討하여 상기 方法中 精密度가 가장 높은 SBSM과의 誤差는 約 10% 내외라는 것을 確認하였다. Use of iterative stepwise methods has been a common practice in designing multicomponent distillation columns, Sometimes, it is difficult to justify iterative calculations from the point of view of cost·effectiveness, particularly when the input information does not have precision or accuracy, or when one simply does not have sufficient information for the system under study. In this work a new method was proposed whereby quick and simple procedures give rise to values of 14 different parameters needed for the design of a column for a multicomponent distillation. Several simplifying assumptions are made in the course; the usual one of a quasi-binary in which the average relative volatility is represented by a geometric mean of relative volatilities of the light key referred to the heavy in the bottoms over the light key referred to the heavy in the distillate, Prater and Boyd's approximation for column efficiency, approximations for expedience that arise in the actual mechanical fabrications of columns according to the common industrial practice, and other simplifications in the heat exchanger calculations. In order to validate the proposed method, comparisons are made with other popular methods such as Smith-Brinkly Short-Cut Method(SB), Fenske-Underwood-Erbar-Maddox Short-Cut Method(FUEM) and Step-by-Step Method(SBSM) by means of an actual design example. Departure from the results by the Step-by-Step method was about l096, the latter being the method yielding the highest accuracy as well as precision. Also, in this work procedures are presented for calculations of several hardware parameters of a distillation column and of heat exchangers annexed to the column.
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허우영,석창목,김화중 한국건축시공학회 2004 한국건축시공학회지 Vol.4 No.2
There was the time of IMF(1998) that management condition of construction business had been the worst. After that time, structural regulation was completed and financial structure was returned to normalcy(2001). At that time, the aim of this paper is that fifteen construction business are researched for process of management condition and capital structure after they is selected as samples for three years, also failure of two-groups is predicted as statistics analysis and multiple discriminant analysis for them.In this paper, It is researched financial statement of business by the forecast experiment of failure and analyzed statistically possibility of failure and success for financial ratio. For them, the fifteen companies of failure and the fifteen companies what were not the failure, for listed company, and the fourteen variables are selected and they are analyzed statistically according to Logit Analysis.
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睦榮一,許炳琪 亞洲大學校 1988 論文集 Vol.11 No.-
Use of iterative stepwise methods has been a common practice in designing multicomponent distillation columns. Sometimes, it is difficult to justify iterative calculations from the point of view of cost-effectiveness, particularly when the input information does not have precision or accuracy, or when one simply does not have sufficient information for the system under study. In this work a new method was proposed which permits quick and simple procedures giving rise to values of 14 different parameters needed for the design of a column for a multicomponent distillation Several simplifying assumptions are made in the course: the usual one of a quasibinary in which the average relative volatility of the light key referred to the heavy in the bottoms and the light key referred to the heavy in the bottoms and the light key referred to the heavy in the distillate, Prater and Boyd's approximaton for column efficiency, approximations for expedience that arise in the actual mechanical fabrications of columns according to the common industrial practice, and other simplifications in the heat exchanger calcualtions. In order to validate the proposed method, comparisons are made with other popular methods such as Smith-Brinkly Short-Cut Method(SB), Fenske-Underwood-Erbar-Maddox Short-Cut Method(FUEM) and Step-by-Step Method(SBSM), by means of an actual design example. Departure from the results by the Step-by-Step Method was about 10%, the latter being the method yielding the highest accuracy as well as precision. Also, in this work procedures are presented for calculations of several hardware parameters of a distillation column and of heat exchangers annexed to the column.
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Hydraulic and Thermal Design of Baffled Heat Exchangers
Hur, Byung Ki,Mok, Young Il,Ahn, Tae Young 아주대학교 1982 論文集 Vol.5 No.-
障애板이 設置된 熱交換器의 製作상 불가피하게 發生되는 裂隔 즉, Shell/Tube Bundle, Tube/Baffle 사이의 間隔에 의하여 惹起되는 短絡現像(Short-Circuiting) 等 流動의 樣相을 究明하였으며, 이들의 影響을 考慮한 電力損失 및 총括傳熱係數에 대한 計算方程式을 誘導하였다. 熱交換器 內에서 流體의 流動상태에 따른 각각의 摩擦係數(Friction Factor) 및 J?? 熱傳達係數(J?? Heat Transfer factor)를 Reynolds 數와 管群의 幾何學的 排列의 兩數關係로 圖式化 함으로써 熱交換器의 流動 및 熱傳達設計에의 이용을 가능하게 하였다. 提示된 模型에 의한 計算結果를 實測値 및 現在까지 가장 잘 알려진 設計方法에 의한 計算結果와 比較 檢討하였다. 그 結果로 提示된 模型에 의한 計算値가 電力損失面에서는 5%의 誤差範圍 이내로 實測値에 接近하였으며, 총括 熱傳達係數面에서는 본 硏究의 方法과 기존해 있는 가장 좋은 設計方法에 의한 設計値 사이의 差異가 僅少하다는 것을 發見하였다.
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허병기,목영일,양지원 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.6
액-액 분산계의 유동적 특성인 상대점도에 관하여 분산살의 부피농도 외에 액적 입도분포를 고려하여 수학적 모델, μ_r=ex[AΦ_t+BΦ_t²]을 제시하였다. 이 식에서 A와 B는 연속상과 분산상의 점도, 분산상의 액적 입도분포, 분산상의 액적 직경, 분산상과 연속상 계면의 점도 특성의 함수로 표현된다. 본 연구에서 제안한 모델의 타당성을 검토하기 위하여, 문헌에 발표된 여러 종류의 분산계의 상대점도에 관한 자료들을 본 모델에 적용하여 실험치와 계산치를 비교한 결과, 모델에 의한 계산치가 실험치에 대하여 0%에서 3.86% 사이의 오차분포를 나타내었으며, 에멀젼계에 대해서는 4.09%의 오차범위 내에서 실험치와 일치하였다. The relative viscosity of dispersion was investigated focussing the attention on the drop size distribution as well as the volume concentration of the dispersed phase: μ_r=exp [AΦ_t + BΦ_t²] where φis the volume concentration of the dispersed phase; A and B are functions of drop size distribution of the dispersed phase and viscosities of the continuous and the dispersed phases. In order to validate the proposed model, published data were applied to the model and were compared with calculated results. The errors between experimental viscosities and calculated values ranged from 0% to 3.86% depending on the materials of dispersions. Also the same model has been applied to the emulsion system. Predicted viscosities of emulsions by the model agreed with experimental data reasonably well giving a maximum error of 4.1%.
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