• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Analysis of Magnetic Refrigeration Systems with Staged Regenerators Based on an Idealized Magnetic Material Entropy Model: I
【24h】

Analysis of Magnetic Refrigeration Systems with Staged Regenerators Based on an Idealized Magnetic Material Entropy Model: I

机译：基于理想磁性材料熵模型的分级再生器磁制冷系统分析：I

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have performed a computer analysis of magnetic refrigerators consisting of a single magnetic-material (MM) stage (with T/sub c/ = 70.5 K and resembling GdNi), a hot heat exchanger for rejecting heat to an LN sub 2 sink, a cold heat exchanger for removing heat from a cold cryogenic load and an external regenerator having an integral number n of isolated stages with5 less than or equal to n less than or equal to 10. We use the abbreviation REGMR for such a system. An idealized entropy-versus-temperature model is used to represent the magnetic material. The single MM stage REGMR model proves capable of producing refrigeration from 77 K down to less than 30 K. We estimate two such REGMRs in tandem could produce refrigeration to less than 15 K, depending on the cryogenic load. The numerical analysis is based on strict conservation of energy and we neglect the small hydrodynamic losses of the sup 4 He exchange-gas system and heat-transfer irreversibilities. Performance is evaluated in terms of the lowest temperature achievable, the number of cycles required to reach ''cyclic equilibrium'', the effect of regenerator stage mass and number of stages, and the effect of cryogenic loads. A systematic comparison of the REGMR cycle with other thermodynamic cycles shows the former is unique. The coefficient of performance is evaluated and the REGMR efficiency is determined by comparison with the ideal gas Carnot-cycle refrigerator. 17 refs. (ERA citation 11:041263)

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号