The multiple Cryogenic Thermal Energy Storage (CTES) system was suggested to achieve the commercialization of LAES and increase the capacity of the CTES. This study was aimed to experimentally observe the temperature gradient of multiple CTES system, ...
The multiple Cryogenic Thermal Energy Storage (CTES) system was suggested to achieve the commercialization of LAES and increase the capacity of the CTES. This study was aimed to experimentally observe the temperature gradient of multiple CTES system, which is packed bed type using pebbles, and evaluate the round-trip efficiency between charging and releasing operation. The round-trip operations were conducted continuously in 3 times, and the temperature gradient changes of the entire system for each time were suggested. The gradient was sigmoid shape at first time and then changed to straight line in next times, so that the released cold energy was reduced at 3rd operation. However, the round- trip efficiency was increased to 65%, because the required cold energy for charging were much reduced. In order to achieve 80% efficiency, the insulation of the system should be improved.