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대형 터빈계통의 고효율 배압시스템 개발에 관한 연구(II)
김경근(K.K.Kim),민우홍(W.H.Min),윤석훈(S.H.Yoon) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.7 No.-
The pollution of atmospheric environment becomes serious problem according to the growth of usage of fossil fuel like the coal and the petroleum oil. The demand of clean energy, like the liquefied natural gas(LNG), increases suddenly because it generates few polluting substances when it is burned and it generates relatively less CO₂ gas than the other energy sources. LNG transportation method of our country is marine transportation by ships because the LNG producing place is so far away from our country. All LNG ship use the steam turbine as a main engine, and the vacuum system of steam turbine is a important system for a thermal efficiency of the steam turbine. In this study, a high efficiency vacuum system of steam turbine is developed and accomplished the performance test of this system.
핀-튜브 열교환기에서의 습증기 발생 메커니즘의 파악을 위한 실험적 연구
박상균,윤석훈,김경근,김명환,오철,Park, S.K.,Yoon, S.H.,Kim, K.K.,Kim, M.H.,Oh, C. 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.3
As an improvement in the standard of living and economic growth, the demand for air conditioning equipment is increasing rapidly. Nowadays, air conditioning equipments are being used for industry, large building, house and car. There equipments were concentrated on improving heat efficiency of economic aspects while thy design heat exchanger for cooling and heating. These air conditioning equipments using heat exchanger cause a discomfort to user due to generating mist at the beginning of operating. Therefore, the user demand air of high class and quality. In this experimental study, to acquire elementary data for development of heat exchanger which be able to supply air of high quality, that is to say, possess a restraint effect of mist generation. We estimate an effect on cooling plate quality, supply air velocity, supply air temperature, cooled plate temperature and supply air relative humidity which have an influence on outlet air condition of heat exchanger.
김종헌,김춘식,김경근,오철,Kim, J.H.,Kim, C.S.,Kim, K.K.,Oh, C. 한국마린엔지니어링학회 1993 한국마린엔지니어링학회지 Vol.17 No.2
Real quality and axial void fraction distribution of subcooled refrigerant flow is very important to predict the heat transfer rate and pressure drop in the design of refrigerating system. In the subcooled boiling region, the liquid bulk temperature is still below the corresponding saturation temperature. But beyond the net vapor generation point, bubble detachment is occured actively from the vapor layer formed on the wall. A reliable method to predict the vapor fraction from the liquid bulk temperature is suggested in this paper. And also the actual quality of the subcooled R-113 flow is calculated in the range of 261-1239kg/$m^2$s mass velocity and 10-30K subcooling.
김명환,김철환,오철,윤석훈,김경근,Kim, M.H.,Kim, C.H.,Oh, C.,Yoon, S.H.,Kim, K.K. 한국마린엔지니어링학회 1994 한국마린엔지니어링학회지 Vol.18 No.5
The two-phase flow is observed in power plants, chemical process plants, and refrigeration systems etc., and it is very important to solve the heat transfer mechanism of a boiler, an automic reactor, a condenser and various types of evaporators. Recently, the problem of two phase heat transfer is braught up in many regions with development of energy saving technique. In flow boiling system it is necessary to store data in each condition because the heat transfer characteristics of flow boiling region vary by the change of flow pattern and the magnetude of heat flux to tube length, and be subtly affected by the flow and heating condition. So basic study for knowing flow pattern in heat transfer region and the relation between heat transfer characteristic and flow condition is desired to accumulate data in wide variety of liquid and flow system in the study of heat transfer of two phase flow. In this study R-113 was selected as working fluid whose properties were programmed by least square method, and experiment was conducted in the region of mass flow $1.628{\times}10^6$~$4.884{\times}10^6$/kg/$m^2$hr with inlet subcooling 10~3$0^{\circ}C$, sustaining test section inlet pressure to 1.5kg$_f$/$cm^2$abs.
On-off 제어계통을 갖는 냉동기의 최적제어에 관한 연구
하주식,김원녕,김경근,오철,Ha, J.S.,Kim, W.N.,Kim, K.K.,Oh, C. 한국마린엔지니어링학회 1985 한국마린엔지니어링학회지 Vol.9 No.4
In the case of temperature control of air conditioning and refrigerating system, it is possible to operate the system continuously by controlling the cooling capacity of refrigerating machines. But on-off control system has been adopted for refrigerating system which has more large capacity than that required to remove the generated heat. In this on-off control system, it can be considered that there exists some optimum condition for the refrigerating capacity, operating cycle, running hour, and the temperature difference between thermostat setting value and real one. In this paper, an equation was derived to express the temperature variation of the refrigerated object (Nybrine) and later two evaluating functions were derived. One is for the temperature difference and another is for operating cycle and running hour. The weighted sum of these two functions is defined as the criterion function for the evaluation of the control performance of the system, and then the optimum running condition is investigated in the sense of minimizing the criterion function. Experiments showed that the heat balance equation derived for the temperature variation and the estimation of the time constant of the refrigerated system are appropriate. By conclusion, if a proper weighting factor D is selected, the optimum conditions exist for the refrigerating capacity, running hour, and operating cycle in the on-off temperature control of the refrigerating system.