Mixed refrigerants for a glass capillary micro cryogenic cooler

被引：45

作者：

Lin, M. -H. ^{[1
]}

Bradley, P. E. ^{[2
]}

Huber, Marcia L. ^{[2
]}

Lewis, R. ^{[1
]}

Radebaugh, R. ^{[2
]}

Lee, Y. C. ^{[1
]}

机构：

[1] Univ Colorado, DARPA Ctr Integrated Micro Nanoelectromech Transd, Boulder, CO 80309 USA

[2] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

CRYOGENICS | 2010年 / 50卷 / 08期

关键词：

Mixed refrigerant; Joule-Thomson micro cryogenic cooler;

D O I：

10.1016/j.cryogenics.2010.04.004

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Optimized mixed refrigerants are applied in Joule-Thomson (JT) micro cryogenic coolers (MCC) to enhance efficiency. Mixed refrigerants deliver equivalent refrigeration power with much lower pressure ratio and flow rate compared to pure nitrogen refrigerant. To determine the behavior of mixtures in MCCs, the normal boiling points of the components, mixture solubility, and refrigeration loss due to pressure drop on the low-pressure side of the heat exchanger are evaluated. The MCC discussed here was designed to operate at 77 K with the heat exchanger warm end precooled to 240 K by a thermo-electric cooler. An optimized five-component mixed refrigerant was calculated to provide a minimum isothermal enthalpy difference of 1.35 kJ/mol between 77K and 240 K with a high pressure of 1.6 MPa and a low pressure of 0.1 MPa. Experimentally, a stable temperature of 140 K was achieved with a flow rate of 11 mu mol/s. A transient temperature of 76 K was observed. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：439 / 442

页数：4

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