A numerical study on characteristics of heat transfer in hydrogen filling storage vessel by charging conditions

Abstract

Recently, studies on alternative energy and new energy has been actively conducted due to environmental pollution issues. In particular, hydrogen, which is new energy, has no greenhouse gas emissions and can be produced from compounds such as water and organic matter and has no regional bias. Hydrogen electric vehicles have advantages such as high energy density and low charging time compared to electric vehicles based on battery. Many studies are being conducted on storage vessels because hydrogen is charged in storage vessel.Therefore, in this study, first, we compared experimental data with numerical analysis data to verify the numerical method and identify the relationship between Nu and Re numbers. As a result, the relationship of Nu=0.015Re0.9 was derived. Second, we applied the relationship of dimensionless number to the Fortran code to verify the results of the coded program by comparing them with those of the commercial program. Third, based on the developed Fortran code, the variables were set such as APRR(Average pressure ramp rate), inflow temperature, initial pressure and ambient air temperature.As a result of the analysis, the final charging temperature increases as the APRR rises and the final charging temperature decreases as the inflow temperature decreases. Furthermore, the increase in initial pressure has a small effect on the final temperature reduction and the effect of ambient air temperature on the final charge temperature was minimal. It is considered that the final charging temperature of the hydrogen charging storage vessel can be effectively adjusted according to the APRR and inflow temperature setting through the main effect analysis.