UNDERSTANDING DYNAMIC BEHAVIORS OF A LARGE SCALE CRYOGENIC PLANT

Development of Cryogenic Process Real-time SimulaTor (C-PREST) has been finalized to provide a platform to study the entire cryo-plant processes of Large Helical Device (LHD). Although LHD utilizes three different cooling schemes, a pool boiling, a forced-flow supercritical helium cooling and a two-phase flow cooling, C-PREST successfully demonstrated its capability to simulate the LHD cooldown process and filling five Liquid helium (LHe) reservoirs independently. To understand the dynamic behaviors of the cryo-plant, the simulations have been carried out for a transient operating condition as introducing the thermal disturbance(s) to the 20,000 liter LHe reservoir of the refrigerator. This paper describes simulations of a large cryogenic plant and discusses dynamic behavior of helium refrigerator/liquefier under various thermal disturbances. Computational speeds associated with these operating conditions were also discussed.