Abstract
Liquid nitrogen (LN2) has been widely used as a cooling medium. A compact LN2 depressurization cryocooling system can be used as a portable cooling unit to satisfy flexible cooling requirements. A prototype of this cryocooling system which was mainly composed of a LN2 tank, a LN2 pump, a heat exchanger and a vacuum pump was built and tested. In the test, the lowest cooling temperature could reach below 65 K, and the average temperature of 0.95 m3 LN2 dropped from 73.5 K to 68.1 K after 6814 s of running. The average refrigeration power reached 1326 W at 65 K. Meanwhile, the system operation process was simulated through theoretical analysis and modeling. Simulation results were nearly consistent with experimental results and the dynamic operating characteristics were well captured. For the experimental apparatus, the LN2 supplement and shutdown of the liquid-ring pump affect the system cooling performance, and modeling results show that the cooling efficiency decreases with the LN2 volume flow rate V̇LN2 increasing whenV̇LN2 > 0.9 m3/h.
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