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Bill Brey M.S. Graduate Student Mechanical Engineering Office: 1337 ERB Email: wbrey@wisc.edu Hometown: Grayslake, IL

Bill Brey M.S. Graduate Student Mechanical Engineering Office: 1337 ERB Email: wbrey@wisc.edu Hometown: Grayslake, IL. Thesis: Development of a Numerical Model to Simulate Magnetic Hysteresis in an Active Magnetic Refrigerator . Motivation For Research.

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Bill Brey M.S. Graduate Student Mechanical Engineering Office: 1337 ERB Email: wbrey@wisc.edu Hometown: Grayslake, IL

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  1. Bill Brey M.S. Graduate Student Mechanical Engineering Office: 1337 ERB Email: wbrey@wisc.edu Hometown: Grayslake, IL Thesis: Development of a Numerical Model to Simulate Magnetic Hysteresis in an Active Magnetic Refrigerator

  2. Motivation For Research • The giant magnetocaloric effect (GMCE) is a recent discovery that occurs in first order magnetic transition (FOMT) materials • These materials experience a significant adiabatic temperature rise when subjected to a magnetic field • These materials also experience significant hysteresis, which limits their efficiency if used in a practical AMR device. • The underlying question is whether the benefit of a greater temperature change in GMCE materials outweighs the losses due to hysteresis when compared to using non-hysteretic magnetocaloric materials as refrigerants.

  3. Project Goals • Develop and implement a model of hysteresis into the existing 1D AMR numerical model created at the SEL • Validate the model using experimental hysteresis data for different materials • Compare performance of hysteretic FOMT materials to that of non-hysteretic magnetocaloric materials. Active Magnetic Regenerative Refrigeration Cycle

  4. Preliminary Results • Single shot cyclic magnetization/demagnetization model • Gradual temperature rise of hysteretic material when exposed to sinusoidal applied magnetic field • Entropy Generation term is added to the energy balance equation • The COP of the 1D AMR model decreases rapidly as the entropy rate is increased

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