冷冻手术是一种通过冷冻过程来破坏癌症等不良组织的技术。ASHRAE之前的一篇论文描述了用于冷冻手术的预冷混合气体焦耳-汤姆逊（MGJT）冷冻探针的热力学建模工具的开发。建造了一个实验测试装置，用于测量预冷MGJT低温探针的性能；实验数据将用于调整和验证模型，并证明在模型选择的最佳混合物成分和操作参数下可获得的额外冷却能力。一个商用的cryoprobe系统已经过改造，以集成测量仪器，足以表征单个部件以及整个系统的性能。测量包括用于解析热力学状态的温度和压力传感器，以及用于计算热量和功传递率的流量计。 使用电加热器施加热负荷以表征制冷性能。位于回热器内部的温度测量用于捕捉两相多组分混合物的传热性能。对该实验进行了不确定度分析，结果表明，在使用合成制冷剂和碳氢化合物混合气体的标称操作条件下，通过测量值可以计算出性能目标，不确定度小于10%。为了演示各种性能指标的计算，减少并呈现了R23、R14和氩气混合物的初步数据。引文:内华达州拉斯维加斯ASHRAE会议论文

Cryosurgery is a technique for destroying undesirable tissue such as cancers using a freezing process. A previous ASHRAE paper describes the development of a thermodynamic modeling tool for a precooled Mixed Gas Joule-Thomson (MGJT) cryoprobe used for cryosurgery. An experimental test facility has been constructed to measure the performance of a precooled MGJT cryoprobe; the experimental data will be used to tune and verify the model, and to demonstrate additional cooling capacity available with the optimal mixture compositions and operating parameters selected by the model.A commercially available cryoprobe system has been modified to integrate measurement instrumentation that is sufficient to characterize the performance of the individual components as well as the overall system. Measurements include temperature and pressure sensors to resolve thermodynamic states, and flow meters to calculate heat and work transfer rates. A thermal load is applied using an electric heater to characterize the refrigeration performance. Temperature measurements located inside of the recuperator are used to capture the heat transfer performance of the two-phase, multi-component mixture. An uncertainty analysis for the experiment is presented which shows that the performance targets can be computed from the measurements with an uncertainty of less than 10% under nominal operating conditions using both a synthetic refrigerant and hydrocarbon based gas mixture. Preliminary data for a mixture of R23, R14 and argon are reduced and presented in order to demonstrate the computation of various performance metrics.