R. Teyber

Bio: R. Teyber is an academic researcher from Lawrence Berkeley National Laboratory. The author has contributed to research in topics: Magnet & Superconducting magnet. The author has an hindex of 11, co-authored 29 publications receiving 340 citations. Previous affiliations of R. Teyber include University of Victoria & Pacific Northwest National Laboratory.

Magnetic heat pumps: An overview of design principles and challenges

Abstract: Active magnetic regeneration is one of the most promising alternative technologies for the development of heat pumps and cooling systems for applications around room temperature. In the open literature, numerous works can be found in which much effort has been put on the development of magnetocaloric materials, magnetic circuits and prototypes. In this article, the authors discuss some of the main challenges encountered in the literature and how design choices impact cooling power and work requirements from a system engineering perspective. First, based on a generic schematic representation of a magnetocaloric heat pump, or refrigerator, various problems and challenges found in the current state of the art are pointed out and discussed. Second, different design principles for magnetic heat pumps are examined. As a means to improving performance, an extended design/optimization methodology is proposed based on entropy generation minimization with performance criteria. Finally, some initial optimization res...

Experimental performance investigation of an active magnetic regenerator subject to different fluid flow waveforms

Abstract: A flow control mechanism based on cam actuated valves is designed and implemented on an active magnetic regenerator test apparatus. The objective is to overcome the brief low field period of the nested concentric Halbach array by decreasing the fluid blow width, displacing fluid only when the magnetic field is close to the minimum and maximum values. Flow waveforms are simulated to evaluate varying blow durations with the same displaced volume. AMR experiments are performed where the largest ExQ of 1.62 W is obtained with VD = 13.90 cm3 and a diversion ratio of δ = 0.41, demonstrating an 11.2% increase over the sinusoidal waveform.

Principles Of Enhanced Heat Transfer

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Principles Of Heat Transfer In Porous Media

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Energy Applications of Magnetocaloric Materials

Abstract: The need for energy-efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up-to-date account of the energy-related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.