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doi: 10.3850/978-981-08-7614-2_IMPRES048
Effect of Working Gas and Heat Exchanger Dimensions on Joule Thomson Microcooler Performance
Masashi Kuwamoto1, Adhika Widyaparaga1, Naoya Sakoda2, Masamichi Kohno1 and Yasuyuki Takata1,a
1Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan.
atakata@mech.kyushu-u.ac.jp
2International Research Center for Hydrogen Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan
ABSTRACT
We have constructed a Joule-Thomson microcooler employing a concentric heat exchanger with the outer tube having an outer diameter of less than 1 mm. We have constructed several versions of the microcooler using different heat exchanger lengths between 150mm and 450mm. Heat exchanger lengths have been varied and compared. Trials were conducted using inlet pressures from 0.5 MPa to 5 MPa for N2, CO2, and C2H4 as working gases. Experiments have shown that different measurement conditions such as thermocouple position can significantly affect measurement results. To better understand the factors influencing performance we have constructed an analytical code incorporating conventional heat transfer theory.
Keywords: Joule-thomson, Micro-cooling, Heat exchanger.
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