Experimental investigation of CO2 condensation process using cryogen

Carbon dioxide ( CO 2 ) is one of the dominant gas molecules that causes greenhouse effect, i.e. global warming. Numerous studies have been carried out to regulate the emission of CO 2 to reduce greenhouse gas. The liquid CO 2 is a convenient form of transportation compared to high-pressurized gaseous CO 2 . Therefore, the direct liquefaction mechanism of CO 2 at low temperature draws technical attention recently. In particular, cold thermal energy of Liquefied Natural Gas (LNG) could be a candidate to condense gaseous CO 2 , especially in the LNG powered ship. In this paper, the detailed direct condensation process of CO 2 using LN 2 with intermittent solidification is investigated. Pressurized CO 2 at 600 kPa is directly liquefied in a vessel by liquid nitrogen which is supplied into the coiled tube heat exchanger inside the CO 2 vessel. The heat exchanger temperature is controlled from 130 K to 205 K to regulate the solidification and sublimation of CO 2 by duty control with cryogenic solenoid valve. The characteristics of CO 2 condensation process with cryogen are analyzed from the measurement results. The results show that the solidification causes the significant degradation of CO 2 condensation heat transfer. Finally, the condensation rate with and without solidification is compared.