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Magnetorheological fluid is applied at room temperature refrigeration feasibility study

Author: ZhuYang
Tutor: LiSuZuo
School: Nanjing University of Technology and Engineering
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Magnetic refrigeration Magnetic refrigeration cycle Entropy difference Evaluation Magnetorheological fluid Particle Coefficient of performance
CLC: TU831.6
Type: Master's thesis
Year: 2007
Downloads: 181
Quote: 0
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Abstract


Energy saving and environment protection is the key topic in the refrigeration investigation field. Magnetic refrigeration is attracting considerable attention worldwide, because it operated energy-efficient and environmentally clean. The first fall due international magnetic refrigeration technicality meeting convened in 2005. It sign that the room temperature magnetic refrigeration has been ratified by most countries. Magnetic refrigeration has grown up in the lower temperature. It is especially important to enhance the operation temperature to room temperature for the market application worldwide of late:In this paper, the principle of the magnetic refrigeration and the usual magnetic refrigeration cycle is introduced in detail. It stars with a review of the work, heat and internal energy of a magnetized specimen in a magnetic field. Cycle processes are discussed in detail, e.g. the Brayton, Ericsson, Carnot cycles. And the coefficient of performance is described by heat capacities. A evaluation model of the entropy difference is obtained, and the analysis of the relation between the optimal coefficient of performance and the cooling rate about the ferromagnetic Stirling refrigeration cycle is give.Furthermore, this study examines the feasibility of using magnetic particles in liquid suspension as a working fluid to achieve room temperature refrigeration with a permanent magnetic field source. A Conceptual refrigeration system is introduced. This system use a slurry of particles in a liquid metal carrier, specifically colloidal particles of gadolinium of 5.5nm diameter suspend in sodium potassium eutectic suspension as the work material. And the coefficient of performance of this system is given to prove the feasibility of magnetic particle suspensions for refrigeration at room temperature.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning > Air-conditioning refrigeration technology
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