کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1507354 1511048 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimization of a Brayton cryocooler for ZBO liquid hydrogen storage in space
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Optimization of a Brayton cryocooler for ZBO liquid hydrogen storage in space
چکیده انگلیسی


• Developed an optimized design of a 20 K cryocooler providing 20 W of refrigeration.
• Demonstrated the performance of the 20 K turboalternator up to 42 W of cooling.
• Built a prototypical compressor motor and tested up to 400 W.
• Performed a scaling study for refrigeration loads up to 80 W.

NASA is evaluating and developing technology for long-term storage of cryogenic propellant in space. A key technology is a cryogenic refrigerator which intercepts heat loads to the storage tank, resulting in a reduced- or zero-boil-off condition. Turbo-Brayton cryocoolers are particularly well suited for cryogen storage applications because the technology scales well to high capacities and low temperatures. In addition, the continuous-flow nature of the cycle allows direct cooling of the cryogen storage tank without mass and power penalties associated with a cryogenic heat transport system. To quantify the benefits and mature the cryocooler technology, Creare Inc. performed a design study and technology demonstration effort for NASA on a 20 W, 20 K cryocooler for liquid hydrogen storage. During the design study, we optimized these key components: three centrifugal compressors, a modular high-capacity plate-fin recuperator, and a single-stage turboalternator. The optimization of the compressors and turboalternator were supported by component testing. The optimized cryocooler has an overall flight mass of 88 kg and a specific power of 61 W/W. The coefficient of performance of the cryocooler is 23% of the Carnot cycle. This is significantly better performance than any 20 K space cryocooler existing or under development.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cryogenics - Volume 64, November–December 2014, Pages 172–181
نویسندگان
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