Abstract
Hydrogen has advantages of high efficiency and cleanliness, which has become main target of energy strategy development in many countries. Hydrogen storage is an integral part of the efficient utilization of hydrogen energy, and high pressure and low temperature can effectively improve the storing energy density. This paper studied the hydrogen storage behavior of cryo-compressed hydrogen (CcH2) in an insulated pressure tank. Since the temperature of CcH2 can change from 40.15 K to 233.15 K, it is crucial to consider the temperature change when predicting the dormancy time of CcH2 tank. This paper proposed a theoretical method for predicting the storage behavior of cryo-compressed hydrogen storage tank. The heat influx of radiation, conduction and convention through the thermal boundary of CcH2 tank was calculated based on realtime temperature difference between liner and outer vessel. The theoretical method was verified by experimental results from existing reports, and the predicting results showed good consistency. Furthermore, based on the dynamic heat influx, the influence of filling rate, initial pressure and initial temperature on dormancy time was discussed in detail. Finally, a prediction model was proposed for estimating the dormancy time for cryo-compressed hydrogen.
