Thermodynamic analysis of magnetically active regenerator from 30 to 70 K with a Brayton-like cycle
✍ Scribed by Koichi Matsumoto; Takasu Hashimoto
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 620 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
A magnetically active regenerator produces refrigeration without gas expansion because it makes use of the magnetocaloric effect. A magnetically active regenerator is equivalent to many cascading magnetic refrigerators. Analytical estimation of its performance is difficult owing to the complexity of the system. In the present paper, a model active regenerator with a Brayton-like operation cycle was analysed by numerical cycle simulation. DyAI2. 2 sintered compound which has a Curie temperature of 50 K was adopted as the magnetic regenerator matrix in the temperature range below 70 K. From the analysis, the model active regenerator was shown to have the potential of attaining a lowest temperature of 30 K from 70 K. The optimum operating conditions giving maximum refrigeration capacity are discussed and thermal efficiency is estimated.