SET Proceedings 2978-4387 Caravel Press 10.65582/set.2005.103 2005.103 Vaporization Characteristics of Super Low Temperature Liquefied Nitrogen Gas LeeSang Chui KongTae Woo KimSung Su KimChul Su ChungHan Shik JeongHyo Min Graduate School, Department of Mechanical and Precision Engineering, Gyeongsang National University, Tongyeong, KOREA Korea Technology Eng. Co., Ltd., Seongnam, KOREA School of Mechanical and Aerospace Engineering, Gyeongsang National University, Tongyeong, KOREA 23092005 4 1 978-7-112-07718-2 466 471 23 September 2005 © 2005 Copyright WSSET 2005

This paper was carried out to determine the vaporization characteristics of vaporizer with super low temperature liquid nitrogen gas. Vaporizer used in this experiment is aero fin coil tube type which has inside diameter of 5mm, outside diameter of 6mm. and total length of vaporizer is about 20,000mm. The experimental parameters are air velocity and flow rate of liquefied nitrogen. Temperatures of vaporizer surface were measured by T- type thermocouples. For measuring the surface temperature of vaporizer, the thermocouples were installed every 2,000mm in the vaporizer length direction. The results present temperature transitions and phenomenon on vaporizer surface with respect to the flow rates of liquefied nitrogen and air velocity as time function.

 vaporizer heat transfer liquefied nitrogen super low temperature 23 to 25 September 2005 4th International Conference on Sustainable Energy Technologies SET2005 4 Jinan, China Wei Sun. Peng Hu. Zeshal Chen and Lei Jia. 2005. Performance of cryogenic thermoelectric generator in LNG cold energy utilization. Eenergy Conversion and Management. Vol 46. pp789-796. Korea Q.-S. Chen, J. Wegrzyn and V. Prasad. 2004. Analysis of temperature and pressure changes in liquefied natural gas(LNG) cryogenic tanks. Cryogenics. Vol 44. pp701-709. Korea. S. C. Nam. S. C. Lee. Y. W. Lee and Y. S. Sohn, 1998. Characteristics of Evaporation Heat Transfer in a Small-Scale Cryogenic Heat Exchange System for the Utilization of LNG Cold Energy. KIGAS, Vol 2. No 4. pp25-33. Korea Sang Chul Nam. Sang Chul and Byung Duck Park. 2000. Performance of Evaporation Heat Transfer Enhancement and Pressure Drop for Liquid Nitrogen. Trans. of KSME(B). Vol 24. No 3. pp363-372. Korea. K. I. Choi and H. M. Chang. 1999. Influence of frost formation in a cryogenic nitrogen-ambient air heat exchanger on power generation cycle utilizing cold energy. Proceeding of the SAREK 1999 Winter Annual conference. pp95-100. Korea Eul-Jin Jang. 2001. A Study on the Vaporization Properties of Liquid Nitrogen. Master's thesis. Kongju National University. Korea O. H. Rho. 2004. Compressible Fluid Flow, pakyoungsa. Koreal