抄録
The performance of a Joule-Thomson microcooler utilizing a concentric counterflow heat exchanger was investigated in this study. Trials were conducted for three coolants: C_2H_4, CO_2 and N_2. Three microcoolers of different dimensions were tested for pressures ranging from 0.5 MPa to 5MPa. The microcooler managed to obtain cooling power of 100mW at 234 K, well exceeding the target performance of 100 mW at 273 K. Comparisons between gas species highlight the importance of considering favorable heat transfer properties as well as a high Joule-Thomson coefficient when selecting the working gas.
