摘要: |
通过实验测定了不同氮气预冷温度、热负荷条件下冷冻消融探针内J-T节流制冷器温度与流量。实验结果表明:冷冻消融探针工作温度随氮气预冷温度变化而变化,热负荷越大所需氮气预冷温度越低;氮气预冷温度过低会造成制冷量浪费与回热换热器换热效率降低;氮气流量随高压氮气出口温度的降低而增大,除临界区域外氮气计算流量符合测试结果。 |
关键词: 热工学 节流制冷器 冷冻消融探针 冷冻消融 |
DOI: |
投稿时间:2011-09-23
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基金项目: |
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Experimental Characterization of the Joule-Thomson Cryostat of a Cryoprobe |
Ye Ping,Chang Zhaohua,Zhao Qingxiao,Xu Binkai,Liu Meijing |
(College of Energy and Power Engineering, Shanghai University of Science and Technology;Accutarget MediPharma Co., Ltd.) |
Abstract: |
Various experiments were conducted to measure the temperature and flow rate of a Joule-Thomson cryostat corresponding to different precooling temperatures of nitrogen and thermalload. The results demonstrated that the steady-state temperature of cryoprobe changed with precooling temperature, and that the greater the thermal load, the lower the requisite precooling temperature of the nitrogen passing through the Joule-Thomson cryostat. The experiments further indicated that too low precooling temperature of nitrogen is not necessary as it may cause a great waste of nitrogen and lower heat exchanger efficiency; and the nitrogen flow rate increased as the outlet temperature of supply nitrogen decreased. The calculated results of nitrogen flow rate correlated well with the experimental measurement. |
Key words: pyrology joule-thomson cryostat cryoprobe cryoablation |