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인종수 ( Jong-soo In ) 한국고등직업교육학회 2002 한국고등직업교육학회논문집 Vol.3 No.4
The performance of bottoming cycle in combined cycle power plant has been investigated to see the effect of steam pressure on bottoming cycle efficiency and to select the optimal steam pressure of heat recovery steam generators as a function of the gas turbine exhaust temperature. The effects of steam pressure on bottoming cycle efficiency are discussed. For a given gas turbine exhaust temperature, an optimal steam pressure which results in maximum efficiency is demonstrated. Compared to maximum steam pressure constraint by exit steam quality of steam turbine at low exhaust gas temperature, the optimum steam pressure is founded to increase bottoming cycle efficiency on the order of 7 percent. Optimal steam pressures are correlated against gas turbine exit temperature by simple polynomial fits.
복합사이클 발전플랜트 폐열회수 보일러의 구성요소 크기비의 최적화
인종수(Jong Soo In),이상용(Sang Yong Lee) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.6
This paper proposes a new approach to find the optimum ratios between sizes of the heat exchangers of the heat recovery steam generator (HRSG) system with limited size to maximize the efficiency of the steam turbine (bottom) cycle of combined cycle power plants (CCPP), but without performing the bottom cycle analysis. This could be achieved by minimizing the unavailable exergy (the sum of the destroyed and the lost exergies) resulted from the heat transfer process of the HRSG system. The present approach is relatively simple and straightforward because the process of the trial-and-error method, typical in performing the bottom cycle analysis for the system optimization, could be avoided. To demonstrate the usefulness of the present method, a single-stage HRSG system was chosen and the optimum evaporation temperature was obtained corresponding to the condition of the maximum useful work. The results show that the optimum evaporation temperature based on the present exergy analysis appears similar to that based on the bottom cycle analysis. Also shown is the dependency of size (NTU) ratios between the heat exchangers on the inlet gas temperature, which is another important factor in determining the optimum condition once overall size of the heat recovery steam generator is given. The present approach turned out to be a useful tool for optimization of the singlestage HRSG systems and can easily be extended to multi-stage systems.
인종수 ( Jong-soo In ),이동원 ( Dong-won Lee ) 한국고등직업교육학회 2000 한국고등직업교육학회논문집 Vol.1 No.1
Algorithm for performance simulation of Counter Flow Wet Type Cooling Tower is described with the base on modular concept. To calibrate the program, cooling water exit temperatures calculated by this program are compared with data by graph being used now. It is shown that differences between results calculated by this program with data by graph are very small. Cooling water exit temperatures according to running conditions of cooling tower is shown to be linearly.
인종수(Jong-Soo In) 한국산업융합학회 1998 한국산업융합학회 논문집 Vol.1 No.2
A computer simulation program for the design of furnace witjin pakaged water-tube boilres is developed and the developed computer program is successfully applied to design the furnace for packaged water-tube boiler. The model by experiment and the model by Hottel are used to predict the exit gas temperature of furnace. The result by two models is discussed and is shown that in the case of constant cross section in furnace, the result is same but in changing the configuration of cross section, the difference by two models is not small.<br/>
김근식 ( Keun-sik Kim ),인종수 ( Jong-soo In ),고광호 ( Kwang-ho Ko ) 한국고등직업교육학회 2004 한국고등직업교육학회논문집 Vol.5 No.4
Recently, Datta et al.<sup>[2]</sup> have developed a method of obtaining the complete set of stabilizing PI, PID controllers for a given LTI system, in which those are determined by solving a set of linear inequalities parameterized by the proportional(P) gain. In this paper, we provide a note about how Datta’s idea can be extended to the problem of finding all stabilizing PD controllers and about an improved method that allows us to calculate the admissible range of P gain more rigorously. An illustrative example is given.
CNC 머시닝 센터에서의 온머신 측정시 적용가능한 센서의 오차특성 분석
이상준 ( Sang-jun Lee ),인종수 ( Jong-soo In ),오태일 ( Tae-il Oh ) 한국고등직업교육학회 2004 한국고등직업교육학회논문집 Vol.5 No.2
On-Machine-Measurement(OMM) system is that the workpiece dimensions are measured using the machine scales and sensors instead of tool after cutting process on a CNC machine. The error states and correcting methods of the sensors have been studied to rise the OMM accuracy. The over-travel errors of the touch trigger probe are increased linearly in proportion to access speed. The method to compensate center alignment error between tool and scanning probe is developed using a position-known hole. The measurement error from a contact angle between scanning probe stylus and workpiece surface is analyzed geometrically. The method has been developed to compensate the alignment error of the laser displacement sensor using reference ball at a known position.
고광호(Kwang-Ho Ko),인종수(Jong_Soo In),오태일(Tae_Il Oh) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.4
This paper is to develop the program for sizing of a counter-flow cooling tower. Air flow, air exit tmperature, fan power are calculated from design coditions of cooling tower by using this program. The basic equations and solutions of the heat transfer and pressure drop of cooling tower are descrived and the algorithm development for design of cooling tower is performed. The variation of fan power of cooling tower in acoording to variation of cell area and fill height is performed by using this program. This result shows that the optimal design for install and running cost of cooling tower can be performed by using this program.<br/> <br/>
이동원 ( Tong-won Lee ),장현탁 ( Hyoun-tak Jang ),인종수 ( Jong-soo In ) 한국고등직업교육학회 2000 한국고등직업교육학회논문집 Vol.1 No.1
In the Warmed-up conditions, the amount of hydrocarbon emisson is very high. In order to achieve the reduction of hydrocarbon in gasoline engine, it is necessary to estimate the fuel and combustion product in the emission. Also the intake air flow-rate should be estimated. So in this paper, we will propose a strategy for estimation of air fuel ratio in a Spark Ignition Engine. We determined the mass of air in the cylinder by filling-emptying method, and estimated the fuel in the intake manifold and cylinder by the "wall-wetting-effect".