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Study on Characteristic of Pressure Drop by using Ejector
신유식(Y. S. Shin),이윤환(Y. H. Lee),허두상(D. S. Heo),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
There are many important factors for breeding fish in an aquafarm. What is especially important for good quality breeding or fish is the maintenance of optimum aquaculture temperature. In summertime, when sea temperatures rise above 25℃ the growth condition is greater and diseases in fish spread. In this study water cooling system using a steam ejector was used to drop the temperature of the water in the aquafarm by about 5℃ from 25℃ or higher. To replace the present water cooling system, we focused on system operated by the latent heat of evaporation. Using a vacuum pressure to evaporate the water in an enclosed tank. The water cooling effects are dependent on the vacuum pressure in the enclosed tank, and the cooling water is generated by evaporation. As the experimental result, the absolute vacuum pressure was obtained with about 8~10㎜Hg with a the vacuum tank capacity of 85Liters. The reaching time needed to reach this vacuum pressure was about 8~10 minutes and had a water cooling temperature difference of 6℃.
계절별 조건에 따른 초저온 액화가스 기화기의 실험적 연구
이용훈(Y. H. Lee),Eldwin Djajadiwinata,정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper was studied for optimum design of the used vaporizer at a satellite station. Generally, the frozen air is created by temperature drop on the vaporizer surface. In addition, the frost creates ice deposit layer, therefore, heat transfer on vaporizer decreases into the adiabatic condition. By this reason, recent vaporizer system is installed as parallel type, and it takes tree times of vaporizer capacity. But this vaporizer system requires much installation costs and restricted by some space. It is very important to solve this problem. This study paper is regarding air vaporizer where the utilization increases recently. There are three variable conditions which are used in this study research. To contribute in developing an efficient air-heating vaporizer, we did experiment on finless and 4fin801e and 8fin551e type air-heating vaporizer. The experiment was conducted by varying the ambient condition and the length of the vaporizer. The ambient air was managed so that it has the same condition with air condition in each season. In this experiment, the main aspect in analyzing the performance of air heating vaporizer is the inlet and outlet temperature compare to the length of the vaporizer at different season.