SET Proceedings 2978-4387 Caravel Press 10.65582/set.2010.017 2010.017 Experimental study on a CO2-solid-gas-flow-based ultra-low temperature cascade refrigeration system NiuXiao-Dong xniu@mail.doshisha.ac.jp YamaguchiHiroshi NeksåPetter Energy Conversion research Center, Doshisha University, Kyoto, Japan SINTEF Energy Research, NO-7465 Trondheim, Norway 24082010 9 978-1-995850-04-7 1 6 24 August 2010 © 2010 Copyright WSSET 2010

CO2 solid-gas two phase flow is investigated in an ultra-low temperature cascade refrigeration system. Visualization test shows that dry ice sedimentation occurs in low mass flow rate. The sedimentation also occurs at low condensation temperature and low heating power input. Based on the present investigation, it is found that the present ultra-low temperature cascade refrigeration system is better to work at heating power input above 900W and condensation temperature above -20°C. At suitable operating condition, the present ultra-low temperature cascade refrigeration system has been shown the capability of achieving ultra-low temperature -62°C continuously and stably

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