Numerical study on Comparison of Self-Pressurization Behavior of Liquid Nitrogen Cryostat for Umbilical Cord Blood Storage System Design
- Mahfud, M.I. (Graduate School of dept. of Refrigeration and Air Conditioning Eng., Pukyong National University) ;
- Phil, K.E. (Department of Refrigeration and Air Conditioning Engineering, Pukyong National University)
- Published : 2009.11.19
Abstract
Since cryogens are stored at very low temperatures, the cryogenic storage systems are quite sensitive to heat leaks. Even though the vessel operated under sealed condition with vacuum insulation and reflective coatings are used, the heat leakage into the vessel is still unavoidable. Therefore, this paper concerns with numerical study of self-pressurization used to analysis the optimum design with the variation volume fraction, effect of heat flux and storage pressure of liquid nitrogen. The result shows that as the volume fraction increases, the pressure rise reduces and the relatively at atmosphere pressure is better than the higher one. In addition, higher heat flux leads the pressure rise increases faster than low one. The additional of heat pipe system to reduce the pressure rise rate also has been done. By this comparison, the optimum design for storage umbilical cord blood can be selected.