In this study, a cryogenic turbo-based refrigerator, with high-speed foil gas bearing\nturboexpander and plate-fin heat exchanger, was presented. For the cooling process of a cryogenic\nrefrigerator is long and complex, the efficient simulation of the dynamic performance is vital for its\nevaluation and operation. It is difficult to achieve this purpose. Because the cryogenic refrigerator\nwill go through great temperature changes, resulting in dynamic performances of components\ngoing to complexity. In this article, the turboexpander was simulated using CFX, and the matching\nmodels with expansion works of consumption and utilization were unified and modified. With\nnumerical calculation of heat exchanger, the dynamic simulation model of the refrigerator was\nimproved via MATLAB code. The calculation method of the required input energy of the\nrefrigerator in cooling processes was proposed based on the simulation and integration. The energy\nefficiency and economy cost of the refrigerator were evaluated under different operation modes.\nThe refrigerator with a motor was more stable than the one with a blower. The refrigerator was\ntested under different conditions, the results of which agreed well with simulation data. The\nsimulation method is efficient to serve practical applications, improve energy efficiency and reduce\ncosts.
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